[PATCH 0/3] ARM64: meson: Meson8b and GXBB DWMAC glue driver

[PATCH 0/3] ARM64: meson: Meson8b and GXBB DWMAC glue driver

[Martin Blumenstingl]

This adds a DWMAC glue driver for the PRG_ETHERNET registers found in
Meson8b and GXBB SoCs. Based on the "old" meson6b-dwmac glue driver
the register layout is completely different.
Thus I introduced a separate driver.

Changes compared to the RFC version:
- switch from syscon / regmap to assigning the corresponding register
  region directly to the driver (like meson6-dwmac does it)
- dropped "fix_mac_speed" callback since the reference driver does not
  implement it (I could not test if it is required due to lack of
  hardware)
- switch to common clock framework now that we know what bits 5:4
  (mux clock), 6:5 (250MHz divider) and 10 (configurable 5 or 10
  divider) are used for
- Removed dts property "amlogic,mp2-clock" because it is now part of
  the clocks which are registered by the glue driver
- Removed dts properties "amlogic,enable-tx-phy-ref-clk" and
  "amlogic,tx-delay" because it seems we can guess them based on the
  phy-mode (the original Amlogic dts files only supply two different
  values: one value for the internal RMII PHY and another one for the
  external RGMII Gbit PHY).
  If required we can extend the code in the future to make these
  configurable.
- This means that the only Meson8b / GXBB specific part of the binding
  is the clkin0 (FCLK_DIV2) clock, as it's needed for the mux clock.
  Everything else is auto-detected based on the phy-mode (which is
  already mandatory in stmmac).

I have successfully tested this on a Vega S95 Meta clone which comes
with a "broken" bootloader (which programs the ethernet registers to
"Fast Ethernet / RGMII" mode, while the board has a Realtek Gbit PHY).
Before this series stmmac was detected, I got a network interface but
no traffic was flowing.

Due to lack of hardware I could not test this on a device which uses
the internal RMII (Fast Ethernet) PHY.


Martin Blumenstingl (3):
  net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings
  net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC
  ARM64: dts: meson-gxbb: use the new GXBB DWMAC glue driver

 .../devicetree/bindings/net/meson-dwmac.txt        |  43 ++-
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   7 +-
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    | 327 +++++++++++++++++++++
 4 files changed, 367 insertions(+), 12 deletions(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

-- 
2.9.3

[PATCH 1/3] net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings

[Martin Blumenstingl]

This patch adds the documentation for the DWMAC ethernet controller
found in Amlogic Meson 8b (S805) and GXBB (S905) SoCs.
The main difference between the Meson6 glue is that different registers
(with different layout) are used.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 .../devicetree/bindings/net/meson-dwmac.txt        | 43 ++++++++++++++++++----
 1 file changed, 35 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/meson-dwmac.txt b/Documentation/devicetree/bindings/net/meson-dwmac.txt
index ec633d7..8db6899 100644
--- a/Documentation/devicetree/bindings/net/meson-dwmac.txt
+++ b/Documentation/devicetree/bindings/net/meson-dwmac.txt
@@ -1,18 +1,31 @@
 * Amlogic Meson DWMAC Ethernet controller
 
 The device inherits all the properties of the dwmac/stmmac devices
-described in the file net/stmmac.txt with the following changes.
+described in the file stmmac.txt in the current directory with the
+following changes.
 
-Required properties:
+Required properties on all platforms:
 
-- compatible: should be "amlogic,meson6-dwmac" along with "snps,dwmac"
-	      and any applicable more detailed version number
-	      described in net/stmmac.txt
+- compatible:	Depending on the platform this should be one of:
+			- "amlogic,meson6-dwmac"
+			- "amlogic,meson8b-dwmac"
+			- "amlogic,meson-gxbb-dwmac"
+		Additionally "snps,dwmac" and any applicable more
+		detailed version number described in net/stmmac.txt
+		should be used.
 
-- reg: should contain a register range for the dwmac controller and
-       another one for the Amlogic specific configuration
+- reg:	The first register range should be the one of the DWMAC
+	controller. The second range is is for the Amlogic specific
+	configuration (for example the PRG_ETHERNET register range
+	on Meson8b and newer)
 
-Example:
+Required properties on Meson8b and newer:
+- clock-names:	Should contain the following:
+		- "stmmaceth" - see stmmac.txt
+		- "clkin0" - parent clock of internal mux (usually FCLK_DIV2)
+
+
+Example for Meson6:
 
 	ethmac: ethernet@c9410000 {
 		compatible = "amlogic,meson6-dwmac", "snps,dwmac";
@@ -23,3 +36,17 @@ Example:
 		clocks = <&clk81>;
 		clock-names = "stmmaceth";
 	}
+
+Example for GXBB:
+	ethmac: ethernet@c9410000 {
+		compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
+		reg = <0x0 0xc9410000 0x0 0x10000>,
+			<0x0 0xc8834540 0x0 0x8>;
+		interrupts = <0 8 1>;
+		interrupt-names = "macirq";
+		clocks = <&clkc CLKID_ETH>,
+				<&clkc CLKID_FCLK_DIV2>;
+		clock-names = "stmmaceth", "clkin0";
+		phy-mode = "rgmii";
+		status = "disabled";
+	};
-- 
2.9.3

[PATCH 2/3] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Martin Blumenstingl]

The Ethernet controller available in Meson8b and GXBB SoCs is a Synopsys
DesignWare MAC IP core which is already supported by the stmmac driver.

In addition to the standard stmmac driver some Meson8b / GXBB specific
registers have to be configured for the PHY clocks. These SoC specific
registers are called PRG_ETHERNET_ADDR0 and PRG_ETHERNET_ADDR1 in the
datasheet.
These registers are not backwards compatible with those on Meson 6b,
which is why a new glue driver is introduced. This worked for many
boards because the bootloader programs the PRG_ETHERNET registers
correctly. Additionally the meson6-dwmac driver only sets bit 1 of
PRG_ETHERNET_ADDR0 which (according to the datasheet) is only used
during reset.

Currently all configuration values can be determined automatically,
based on the configured phy-mode (which is mandatory for the stmmac
driver). If required the tx-delay and the mux clock (so it supports
the MPLL2 clock as well) can be made configurable in the future.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    | 327 +++++++++++++++++++++
 2 files changed, 328 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 0fb362d..79e5d0c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -9,7 +9,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
 obj-$(CONFIG_STMMAC_PLATFORM)	+= stmmac-platform.o
 obj-$(CONFIG_DWMAC_IPQ806X)	+= dwmac-ipq806x.o
 obj-$(CONFIG_DWMAC_LPC18XX)	+= dwmac-lpc18xx.o
-obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o
+obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o dwmac-meson8b.o
 obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rk.o
 obj-$(CONFIG_DWMAC_SOCFPGA)	+= dwmac-socfpga.o
 obj-$(CONFIG_DWMAC_STI)		+= dwmac-sti.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
new file mode 100644
index 0000000..0d4e152
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -0,0 +1,327 @@
+/*
+ * Amlogic Meson S805/S905 DWMAC glue layer
+ *
+ * Copyright (C) 20016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/ethtool.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/of_net.h>
+#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/stmmac.h>
+
+#include "stmmac_platform.h"
+
+#define PRG_ETH0			0x0
+
+#define PRG_ETH0_RGMII_MODE		BIT(0)
+
+/* mux to choose between fclk_div2 (bit unset) and mpll2 (bit set) */
+#define PRG_ETH0_CLK_M250_SEL_SHIFT	4
+#define PRG_ETH0_CLK_M250_SEL_MASK	GENMASK(4, 4)
+
+#define PRG_ETH0_TXDLY_SHIFT		5
+#define PRG_ETH0_TXDLY_MASK		GENMASK(6, 5)
+#define PRG_ETH0_TXDLY_OFF		(0x0 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_QUARTER		(0x1 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_HALF		(0x2 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_THREE_QUARTERS	(0x3 << PRG_ETH0_TXDLY_SHIFT)
+
+/* divider for the result of m250_sel */
+#define PRG_ETH0_CLK_M250_DIV_SHIFT	7
+#define PRG_ETH0_CLK_M250_DIV_WIDTH	3
+
+/* divides the result of m25_sel by either 5 (bit unset) or 10 (bit set) */
+#define PRG_ETH0_CLK_M25_DIV_SHIFT	10
+#define PRG_ETH0_CLK_M25_DIV_WIDTH	1
+
+#define PRG_ETH0_INVERTED_RMII_CLK	BIT(11)
+#define PRG_ETH0_TX_AND_PHY_REF_CLK	BIT(12)
+
+#define MUX_CLK_NUM_PARENTS		2
+
+struct meson8b_dwmac {
+	struct platform_device	*pdev;
+
+	void __iomem		*regs;
+
+	phy_interface_t		phy_mode;
+
+	struct clk_mux		m250_mux;
+	struct clk		*m250_mux_clk;
+	struct clk		*m250_mux_parent[MUX_CLK_NUM_PARENTS];
+
+	struct clk_divider	m250_div;
+	struct clk		*m250_div_clk;
+
+	struct clk_divider	m25_div;
+	struct clk		*m25_div_clk;
+};
+
+static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
+				    u32 mask, u32 value)
+{
+	u32 data;
+
+	data = readl(dwmac->regs + reg);
+	data &= ~mask;
+	data |= (value & mask);
+
+	writel(data, dwmac->regs + reg);
+}
+
+static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
+{
+	struct clk_init_data init;
+	int i, ret;
+	struct device *dev = &dwmac->pdev->dev;
+	char clk_name[32];
+	const char *clk_div_parents[1];
+	const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
+	unsigned int mux_parent_count = 0;
+	static struct clk_div_table clk_25m_div_table[] = {
+		{ .val = 0, .div = 5 },
+		{ .val = 1, .div = 10 },
+		{ /* sentinel */ },
+	};
+
+	/* get the mux parents from DT */
+	for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
+		char name[16];
+
+		snprintf(name, sizeof(name), "clkin%d", i);
+		dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
+		if (IS_ERR(dwmac->m250_mux_parent[i])) {
+			/* NOTE: the second clock (MP2) is unused on all known
+			 * boards, thus we're making it optional here.
+			 */
+			if (i > 0)
+				continue;
+
+			ret = PTR_ERR(dwmac->m250_mux_parent[i]);
+			if (ret != -EPROBE_DEFER)
+				dev_err(dev, "Missing clock %s\n", name);
+			dwmac->m250_mux_parent[i] = NULL;
+			return ret;
+		}
+
+		mux_parent_names[i] =
+			__clk_get_name(dwmac->m250_mux_parent[i]);
+		mux_parent_count++;
+	}
+
+	/* create the m250_mux */
+	snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
+	init.name = clk_name;
+	init.ops = &clk_mux_ops;
+	init.flags = CLK_IS_BASIC;
+	init.parent_names = mux_parent_names;
+	init.num_parents = mux_parent_count;
+
+	dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
+	dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
+	dwmac->m250_mux.flags = 0;
+	dwmac->m250_mux.table = NULL;
+	dwmac->m250_mux.hw.init = &init;
+
+	dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
+	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m250_mux_clk)))
+		return PTR_ERR(dwmac->m250_mux_clk);
+
+	/* create the m250_div */
+	snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
+	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
+	init.ops = &clk_divider_ops;
+	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
+	clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
+	init.parent_names = clk_div_parents;
+	init.num_parents = ARRAY_SIZE(clk_div_parents);
+
+	dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
+	dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
+	dwmac->m250_div.hw.init = &init;
+	dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
+
+	dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);
+	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m250_div_clk)))
+		return PTR_ERR(dwmac->m250_div_clk);
+
+	/* create the m25_div */
+	snprintf(clk_name, sizeof(clk_name), "%s#m25_div", dev_name(dev));
+	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
+	init.ops = &clk_divider_ops;
+	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
+	clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
+	init.parent_names = clk_div_parents;
+	init.num_parents = ARRAY_SIZE(clk_div_parents);
+
+	dwmac->m25_div.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m25_div.shift = PRG_ETH0_CLK_M25_DIV_SHIFT;
+	dwmac->m25_div.width = PRG_ETH0_CLK_M25_DIV_WIDTH;
+	dwmac->m25_div.table = clk_25m_div_table;
+	dwmac->m25_div.hw.init = &init;
+	dwmac->m25_div.flags = CLK_DIVIDER_ALLOW_ZERO;
+
+	dwmac->m25_div_clk = devm_clk_register(dev, &dwmac->m25_div.hw);
+	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m25_div_clk)))
+		return PTR_ERR(dwmac->m25_div_clk);
+
+	return 0;
+}
+
+static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
+{
+	int ret;
+	unsigned long clk_rate;
+
+	switch (dwmac->phy_mode) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		/* Generate a 25MHz clock for the PHY */
+		clk_rate = 25 * 1000 * 1000;
+
+		/* enable RGMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
+					PRG_ETH0_RGMII_MODE);
+
+		/* only relevant for RMII mode -> disable in RGMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
+					PRG_ETH0_INVERTED_RMII_CLK, 0);
+
+		/* TX clock delay - all known boards use a 1/4 cycle delay */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
+					PRG_ETH0_TXDLY_QUARTER);
+		break;
+
+	case PHY_INTERFACE_MODE_RMII:
+		/* Use the rate of the mux clock for the internal RMII PHY */
+		clk_rate = clk_get_rate(dwmac->m250_mux_clk);
+
+		/* disable RGMII mode -> enables RMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
+					0);
+
+		/* invert internal clk_rmii_i to generate 25/2.5 tx_rx_clk */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
+					PRG_ETH0_INVERTED_RMII_CLK,
+					PRG_ETH0_INVERTED_RMII_CLK);
+
+		/* TX clock delay cannot be configured in RMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
+					0);
+
+		break;
+
+	default:
+		dev_err(&dwmac->pdev->dev, "unsupported phy-mode %s\n",
+			phy_modes(dwmac->phy_mode));
+		return -EINVAL;
+	}
+
+	ret = clk_prepare_enable(dwmac->m25_div_clk);
+	if (ret) {
+		dev_err(&dwmac->pdev->dev, "failed to enable the PHY clock\n");
+		return ret;
+	}
+
+	ret = clk_set_rate(dwmac->m25_div_clk, clk_rate);
+	if (ret) {
+		clk_disable_unprepare(dwmac->m25_div_clk);
+
+		dev_err(&dwmac->pdev->dev, "failed to set PHY clock\n");
+		return ret;
+	}
+
+	/* enable TX_CLK and PHY_REF_CLK generator */
+	meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
+				PRG_ETH0_TX_AND_PHY_REF_CLK);
+
+	return 0;
+}
+
+static int meson8b_dwmac_probe(struct platform_device *pdev)
+{
+	struct plat_stmmacenet_data *plat_dat;
+	struct stmmac_resources stmmac_res;
+	struct resource *res;
+	struct meson8b_dwmac *dwmac;
+	int ret;
+
+	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+	if (ret)
+		return ret;
+
+	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+	if (IS_ERR(plat_dat))
+		return PTR_ERR(plat_dat);
+
+	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+	if (!dwmac)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!res)
+		return -ENODEV;
+
+	dwmac->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(dwmac->regs))
+		return PTR_ERR(dwmac->regs);
+
+	dwmac->pdev = pdev;
+	dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
+	if (dwmac->phy_mode < 0) {
+		dev_err(&pdev->dev, "missing phy-mode property\n");
+		return -EINVAL;
+	}
+
+	ret = meson8b_init_clk(dwmac);
+	if (ret)
+		return ret;
+
+	ret = meson8b_init_prg_eth(dwmac);
+	if (ret)
+		return ret;
+
+	plat_dat->bsp_priv = dwmac;
+
+	return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+}
+
+static const struct of_device_id meson8b_dwmac_match[] = {
+	{ .compatible = "amlogic,meson8b-dwmac" },
+	{ .compatible = "amlogic,meson-gxbb-dwmac" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, meson8b_dwmac_match);
+
+static struct platform_driver meson8b_dwmac_driver = {
+	.probe  = meson8b_dwmac_probe,
+	.remove = stmmac_pltfr_remove,
+	.driver = {
+		.name           = "meson8b-dwmac",
+		.pm		= &stmmac_pltfr_pm_ops,
+		.of_match_table = meson8b_dwmac_match,
+	},
+};
+module_platform_driver(meson8b_dwmac_driver);
+
+MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
+MODULE_DESCRIPTION("Amlogic Meson S805/S905 DWMAC glue layer");
+MODULE_LICENSE("GPL v2");
-- 
2.9.3

[PATCH 3/3] ARM64: dts: meson-gxbb: use the new GXBB DWMAC glue driver

[Martin Blumenstingl]

The Amlogic reference driver uses the "mc_val" devicetree property to
configure the PRG_ETHERNET_ADDR0 register. Unfortunately it uses magic
values for this configuration.
According to the datasheet the PRG_ETHERNET_ADDR0 register is at address
0xc8834108. However, the reference driver uses 0xc8834540 instead.
According to my tests, the value from the reference driver is correct.

No changes are required to the board dts files because the only
required configuration option is the phy-mode, which had to be
configured correctly before as well.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index 2c200f9..f8cf16e 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
@@ -367,13 +367,14 @@
 		};
 
 		ethmac: ethernet@c9410000 {
-			compatible = "amlogic,meson6-dwmac", "snps,dwmac";
+			compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
 			reg = <0x0 0xc9410000 0x0 0x10000
 			       0x0 0xc8834540 0x0 0x4>;
 			interrupts = <0 8 1>;
 			interrupt-names = "macirq";
-			clocks = <&clkc CLKID_ETH>;
-			clock-names = "stmmaceth";
+			clocks = <&clkc CLKID_ETH>,
+				 <&clkc CLKID_FCLK_DIV2>;
+			clock-names = "stmmaceth", "clkin0";
 			phy-mode = "rgmii";
 			status = "disabled";
 		};
-- 
2.9.3

Re: [PATCH 1/3] net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings

[Rob Herring]

On Mon, Aug 15, 2016 at 06:40:58PM +0200, Martin Blumenstingl wrote:
> This patch adds the documentation for the DWMAC ethernet controller
> found in Amlogic Meson 8b (S805) and GXBB (S905) SoCs.
> The main difference between the Meson6 glue is that different registers
> (with different layout) are used.
> 
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
>  .../devicetree/bindings/net/meson-dwmac.txt        | 43 ++++++++++++++++++----
>  1 file changed, 35 insertions(+), 8 deletions(-)

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH 2/3] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Kevin Hilman]

Martin Blumenstingl <martin.blumenstingl@googlemail.com> writes:

> The Ethernet controller available in Meson8b and GXBB SoCs is a Synopsys
> DesignWare MAC IP core which is already supported by the stmmac driver.
>
> In addition to the standard stmmac driver some Meson8b / GXBB specific
> registers have to be configured for the PHY clocks. These SoC specific
> registers are called PRG_ETHERNET_ADDR0 and PRG_ETHERNET_ADDR1 in the
> datasheet.
> These registers are not backwards compatible with those on Meson 6b,
> which is why a new glue driver is introduced. This worked for many
> boards because the bootloader programs the PRG_ETHERNET registers
> correctly. Additionally the meson6-dwmac driver only sets bit 1 of
> PRG_ETHERNET_ADDR0 which (according to the datasheet) is only used
> during reset.
>
> Currently all configuration values can be determined automatically,
> based on the configured phy-mode (which is mandatory for the stmmac
> driver). If required the tx-delay and the mux clock (so it supports
> the MPLL2 clock as well) can be made configurable in the future.
>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

[...]

> +static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
> +{
> +	struct clk_init_data init;
> +	int i, ret;
> +	struct device *dev = &dwmac->pdev->dev;
> +	char clk_name[32];
> +	const char *clk_div_parents[1];
> +	const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
> +	unsigned int mux_parent_count = 0;
> +	static struct clk_div_table clk_25m_div_table[] = {
> +		{ .val = 0, .div = 5 },
> +		{ .val = 1, .div = 10 },
> +		{ /* sentinel */ },
> +	};
> +
> +	/* get the mux parents from DT */
> +	for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
> +		char name[16];
> +
> +		snprintf(name, sizeof(name), "clkin%d", i);
> +		dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
> +		if (IS_ERR(dwmac->m250_mux_parent[i])) {
> +			/* NOTE: the second clock (MP2) is unused on all known

nit: multi-line comment style  (c.f. Documentation/CodingStyle search
for "multi-line")

> +			 * boards, thus we're making it optional here.
> +			 */
> +			if (i > 0)
> +				continue;

IMO, this is a bit confusing.  I think this should either be coded to
deal with an optional "clkin1" (preferred), or it should be coded to
without a mux and clkin0 is directly the parent of the divider.  The
current way of always bailing out of this loop early is a bit confusing.

> +			ret = PTR_ERR(dwmac->m250_mux_parent[i]);
> +			if (ret != -EPROBE_DEFER)
> +				dev_err(dev, "Missing clock %s\n", name);
> +			dwmac->m250_mux_parent[i] = NULL;
> +			return ret;
> +		}
> +
> +		mux_parent_names[i] =
> +			__clk_get_name(dwmac->m250_mux_parent[i]);
> +		mux_parent_count++;
> +	}
> +
> +	/* create the m250_mux */
> +	snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
> +	init.name = clk_name;
> +	init.ops = &clk_mux_ops;
> +	init.flags = CLK_IS_BASIC;
> +	init.parent_names = mux_parent_names;
> +	init.num_parents = mux_parent_count;
> +
> +	dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
> +	dwmac->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
> +	dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
> +	dwmac->m250_mux.flags = 0;
> +	dwmac->m250_mux.table = NULL;
> +	dwmac->m250_mux.hw.init = &init;
> +
> +	dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
> +	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m250_mux_clk)))
> +		return PTR_ERR(dwmac->m250_mux_clk);
> +
> +	/* create the m250_div */
> +	snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
> +	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
> +	init.ops = &clk_divider_ops;
> +	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;

hmm, with CLK_SET_RATE_PARENT that implies that it might switch the mux,
but it's hard-coded above so the mux only ever has one parent, so that
can never happen.

> +	clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
> +	init.parent_names = clk_div_parents;
> +	init.num_parents = ARRAY_SIZE(clk_div_parents);
> +
> +	dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
> +	dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
> +	dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
> +	dwmac->m250_div.hw.init = &init;
> +	dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
> +
> +	dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);
> +	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m250_div_clk)))
> +		return PTR_ERR(dwmac->m250_div_clk);
> +
> +	/* create the m25_div */
> +	snprintf(clk_name, sizeof(clk_name), "%s#m25_div", dev_name(dev));
> +	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
> +	init.ops = &clk_divider_ops;
> +	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
> +	clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
> +	init.parent_names = clk_div_parents;
> +	init.num_parents = ARRAY_SIZE(clk_div_parents);
> +
> +	dwmac->m25_div.reg = dwmac->regs + PRG_ETH0;
> +	dwmac->m25_div.shift = PRG_ETH0_CLK_M25_DIV_SHIFT;
> +	dwmac->m25_div.width = PRG_ETH0_CLK_M25_DIV_WIDTH;
> +	dwmac->m25_div.table = clk_25m_div_table;
> +	dwmac->m25_div.hw.init = &init;
> +	dwmac->m25_div.flags = CLK_DIVIDER_ALLOW_ZERO;
> +
> +	dwmac->m25_div_clk = devm_clk_register(dev, &dwmac->m25_div.hw);
> +	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m25_div_clk)))
> +		return PTR_ERR(dwmac->m25_div_clk);
> +
> +	return 0;
> +}
> +
> +static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
> +{
> +	int ret;
> +	unsigned long clk_rate;
> +
> +	switch (dwmac->phy_mode) {
> +	case PHY_INTERFACE_MODE_RGMII:
> +	case PHY_INTERFACE_MODE_RGMII_ID:
> +	case PHY_INTERFACE_MODE_RGMII_RXID:
> +	case PHY_INTERFACE_MODE_RGMII_TXID:
> +		/* Generate a 25MHz clock for the PHY */
> +		clk_rate = 25 * 1000 * 1000;
> +
> +		/* enable RGMII mode */
> +		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
> +					PRG_ETH0_RGMII_MODE);
> +
> +		/* only relevant for RMII mode -> disable in RGMII mode */
> +		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
> +					PRG_ETH0_INVERTED_RMII_CLK, 0);
> +
> +		/* TX clock delay - all known boards use a 1/4 cycle delay */
> +		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
> +					PRG_ETH0_TXDLY_QUARTER);
> +		break;
> +
> +	case PHY_INTERFACE_MODE_RMII:
> +		/* Use the rate of the mux clock for the internal RMII PHY */
> +		clk_rate = clk_get_rate(dwmac->m250_mux_clk);
> +
> +		/* disable RGMII mode -> enables RMII mode */
> +		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
> +					0);
> +
> +		/* invert internal clk_rmii_i to generate 25/2.5 tx_rx_clk */
> +		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
> +					PRG_ETH0_INVERTED_RMII_CLK,
> +					PRG_ETH0_INVERTED_RMII_CLK);
> +
> +		/* TX clock delay cannot be configured in RMII mode */
> +		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
> +					0);
> +
> +		break;
> +
> +	default:
> +		dev_err(&dwmac->pdev->dev, "unsupported phy-mode %s\n",
> +			phy_modes(dwmac->phy_mode));
> +		return -EINVAL;
> +	}
> +
> +	ret = clk_prepare_enable(dwmac->m25_div_clk);
> +	if (ret) {
> +		dev_err(&dwmac->pdev->dev, "failed to enable the PHY clock\n");
> +		return ret;
> +	}
> +
> +	ret = clk_set_rate(dwmac->m25_div_clk, clk_rate);
> +	if (ret) {
> +		clk_disable_unprepare(dwmac->m25_div_clk);
> +
> +		dev_err(&dwmac->pdev->dev, "failed to set PHY clock\n");
> +		return ret;
> +	}

In the case of success, the clock is never disabled/unprepared.   You
probably need a .remove function which disables the clock and then calls
stmmac_pltfr_remove.

> +	/* enable TX_CLK and PHY_REF_CLK generator */
> +	meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
> +				PRG_ETH0_TX_AND_PHY_REF_CLK);
> +
> +	return 0;
> +}

[...]

Otherwise, this is looking good.

Also, I tested on meson-gxbb-odroidc2 and meson-gxbb-p200 by booting a debian
root filesystem over NFS and all was well.

Tested-by: Kevin Hilman <khilman@baylibre.com>

Kevin

[PATCH v2 0/4] meson: Meson8b and GXBB DWMAC glue driver

[Martin Blumenstingl]

This adds a DWMAC glue driver for the PRG_ETHERNET registers found in
Meson8b and GXBB SoCs. Based on the "old" meson6b-dwmac glue driver
the register layout is completely different.
Thus I introduced a separate driver.

Changes since v1:
- make clkin1 mandatory because the internal mux expects two clocks
  (in other words: this makes the driver consistent with how the
  hardware actually works)
- expose the MPLL2 clock for use by DT so we can pass it to the ethmac
- added a .remove function to the glue driver which disables and
  unprepares the clocks on driver removal


Martin Blumenstingl (4):
  net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings
  clk: gxbb: expose MPLL2 clock for use by DT
  net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC
  ARM64: dts: meson-gxbb: use the new GXBB DWMAC glue driver

 .../devicetree/bindings/net/meson-dwmac.txt        |  45 ++-
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   8 +-
 drivers/clk/meson/gxbb.h                           |   2 +-
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    | 329 +++++++++++++++++++++
 include/dt-bindings/clock/gxbb-clkc.h              |   1 +
 6 files changed, 374 insertions(+), 13 deletions(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

-- 
2.9.3

[PATCH v2 1/4] net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings

[Martin Blumenstingl]

This patch adds the documentation for the DWMAC ethernet controller
found in Amlogic Meson 8b (S805) and GXBB (S905) SoCs.
The main difference between the Meson6 glue is that different registers
(with different layout) are used.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 .../devicetree/bindings/net/meson-dwmac.txt        | 45 ++++++++++++++++++----
 1 file changed, 37 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/meson-dwmac.txt b/Documentation/devicetree/bindings/net/meson-dwmac.txt
index ec633d7..89e62dd 100644
--- a/Documentation/devicetree/bindings/net/meson-dwmac.txt
+++ b/Documentation/devicetree/bindings/net/meson-dwmac.txt
@@ -1,18 +1,32 @@
 * Amlogic Meson DWMAC Ethernet controller
 
 The device inherits all the properties of the dwmac/stmmac devices
-described in the file net/stmmac.txt with the following changes.
+described in the file stmmac.txt in the current directory with the
+following changes.
 
-Required properties:
+Required properties on all platforms:
 
-- compatible: should be "amlogic,meson6-dwmac" along with "snps,dwmac"
-	      and any applicable more detailed version number
-	      described in net/stmmac.txt
+- compatible:	Depending on the platform this should be one of:
+			- "amlogic,meson6-dwmac"
+			- "amlogic,meson8b-dwmac"
+			- "amlogic,meson-gxbb-dwmac"
+		Additionally "snps,dwmac" and any applicable more
+		detailed version number described in net/stmmac.txt
+		should be used.
 
-- reg: should contain a register range for the dwmac controller and
-       another one for the Amlogic specific configuration
+- reg:	The first register range should be the one of the DWMAC
+	controller. The second range is is for the Amlogic specific
+	configuration (for example the PRG_ETHERNET register range
+	on Meson8b and newer)
 
-Example:
+Required properties on Meson8b and newer:
+- clock-names:	Should contain the following:
+		- "stmmaceth" - see stmmac.txt
+		- "clkin0" - first parent clock of the internal mux
+		- "clkin1" - second parent clock of the internal mux
+
+
+Example for Meson6:
 
 	ethmac: ethernet@c9410000 {
 		compatible = "amlogic,meson6-dwmac", "snps,dwmac";
@@ -23,3 +37,18 @@ Example:
 		clocks = <&clk81>;
 		clock-names = "stmmaceth";
 	}
+
+Example for GXBB:
+	ethmac: ethernet@c9410000 {
+		compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
+		reg = <0x0 0xc9410000 0x0 0x10000>,
+			<0x0 0xc8834540 0x0 0x8>;
+		interrupts = <0 8 1>;
+		interrupt-names = "macirq";
+		clocks = <&clkc CLKID_ETH>,
+				<&clkc CLKID_FCLK_DIV2>,
+				<&clkc CLKID_MPLL2>;
+		clock-names = "stmmaceth", "clkin0", "clkin1";
+		phy-mode = "rgmii";
+		status = "disabled";
+	};
-- 
2.9.3

[PATCH v2 2/4] clk: gxbb: expose MPLL2 clock for use by DT

[Martin Blumenstingl]

This exposes the MPLL2 clock as this is one of the input clocks of the
ethernet controller's internal mux.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/clk/meson/gxbb.h              | 2 +-
 include/dt-bindings/clock/gxbb-clkc.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/meson/gxbb.h b/drivers/clk/meson/gxbb.h
index 217df51..3606e875 100644
--- a/drivers/clk/meson/gxbb.h
+++ b/drivers/clk/meson/gxbb.h
@@ -183,7 +183,7 @@
 /* CLKID_CLK81 */
 #define CLKID_MPLL0		  13
 #define CLKID_MPLL1		  14
-#define CLKID_MPLL2		  15
+/* CLKID_MPLL2 */
 #define CLKID_DDR		  16
 #define CLKID_DOS		  17
 #define CLKID_ISA		  18
diff --git a/include/dt-bindings/clock/gxbb-clkc.h b/include/dt-bindings/clock/gxbb-clkc.h
index 7d41864..244ea6e 100644
--- a/include/dt-bindings/clock/gxbb-clkc.h
+++ b/include/dt-bindings/clock/gxbb-clkc.h
@@ -8,6 +8,7 @@
 #define CLKID_CPUCLK		1
 #define CLKID_FCLK_DIV2		4
 #define CLKID_CLK81		12
+#define CLKID_MPLL2		15
 #define CLKID_ETH		36
 #define CLKID_SD_EMMC_A		94
 #define CLKID_SD_EMMC_B		95
-- 
2.9.3

[PATCH v2 3/4] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Martin Blumenstingl]

The Ethernet controller available in Meson8b and GXBB SoCs is a Synopsys
DesignWare MAC IP core which is already supported by the stmmac driver.

In addition to the standard stmmac driver some Meson8b / GXBB specific
registers have to be configured for the PHY clocks. These SoC specific
registers are called PRG_ETHERNET_ADDR0 and PRG_ETHERNET_ADDR1 in the
datasheet.
These registers are not backwards compatible with those on Meson 6b,
which is why a new glue driver is introduced. This worked for many
boards because the bootloader programs the PRG_ETHERNET registers
correctly. Additionally the meson6-dwmac driver only sets bit 1 of
PRG_ETHERNET_ADDR0 which (according to the datasheet) is only used
during reset.

Currently all configuration values can be determined automatically,
based on the configured phy-mode (which is mandatory for the stmmac
driver). If required the tx-delay and the mux clock (so it supports
the MPLL2 clock as well) can be made configurable in the future.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
---
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    | 329 +++++++++++++++++++++
 2 files changed, 330 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 44b630c..f77edb9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -9,7 +9,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
 obj-$(CONFIG_STMMAC_PLATFORM)	+= stmmac-platform.o
 obj-$(CONFIG_DWMAC_IPQ806X)	+= dwmac-ipq806x.o
 obj-$(CONFIG_DWMAC_LPC18XX)	+= dwmac-lpc18xx.o
-obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o
+obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o dwmac-meson8b.o
 obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rk.o
 obj-$(CONFIG_DWMAC_SOCFPGA)	+= dwmac-altr-socfpga.o
 obj-$(CONFIG_DWMAC_STI)		+= dwmac-sti.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
new file mode 100644
index 0000000..d080512
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -0,0 +1,329 @@
+/*
+ * Amlogic Meson S805/S905 DWMAC glue layer
+ *
+ * Copyright (C) 20016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/ethtool.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/of_net.h>
+#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/stmmac.h>
+
+#include "stmmac_platform.h"
+
+#define PRG_ETH0			0x0
+
+#define PRG_ETH0_RGMII_MODE		BIT(0)
+
+/* mux to choose between fclk_div2 (bit unset) and mpll2 (bit set) */
+#define PRG_ETH0_CLK_M250_SEL_SHIFT	4
+#define PRG_ETH0_CLK_M250_SEL_MASK	GENMASK(4, 4)
+
+#define PRG_ETH0_TXDLY_SHIFT		5
+#define PRG_ETH0_TXDLY_MASK		GENMASK(6, 5)
+#define PRG_ETH0_TXDLY_OFF		(0x0 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_QUARTER		(0x1 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_HALF		(0x2 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_THREE_QUARTERS	(0x3 << PRG_ETH0_TXDLY_SHIFT)
+
+/* divider for the result of m250_sel */
+#define PRG_ETH0_CLK_M250_DIV_SHIFT	7
+#define PRG_ETH0_CLK_M250_DIV_WIDTH	3
+
+/* divides the result of m25_sel by either 5 (bit unset) or 10 (bit set) */
+#define PRG_ETH0_CLK_M25_DIV_SHIFT	10
+#define PRG_ETH0_CLK_M25_DIV_WIDTH	1
+
+#define PRG_ETH0_INVERTED_RMII_CLK	BIT(11)
+#define PRG_ETH0_TX_AND_PHY_REF_CLK	BIT(12)
+
+#define MUX_CLK_NUM_PARENTS		2
+
+struct meson8b_dwmac {
+	struct platform_device	*pdev;
+
+	void __iomem		*regs;
+
+	phy_interface_t		phy_mode;
+
+	struct clk_mux		m250_mux;
+	struct clk		*m250_mux_clk;
+	struct clk		*m250_mux_parent[MUX_CLK_NUM_PARENTS];
+
+	struct clk_divider	m250_div;
+	struct clk		*m250_div_clk;
+
+	struct clk_divider	m25_div;
+	struct clk		*m25_div_clk;
+};
+
+static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
+				    u32 mask, u32 value)
+{
+	u32 data;
+
+	data = readl(dwmac->regs + reg);
+	data &= ~mask;
+	data |= (value & mask);
+
+	writel(data, dwmac->regs + reg);
+}
+
+static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
+{
+	struct clk_init_data init;
+	int i, ret;
+	struct device *dev = &dwmac->pdev->dev;
+	char clk_name[32];
+	const char *clk_div_parents[1];
+	const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
+	static struct clk_div_table clk_25m_div_table[] = {
+		{ .val = 0, .div = 5 },
+		{ .val = 1, .div = 10 },
+		{ /* sentinel */ },
+	};
+
+	/* get the mux parents from DT */
+	for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
+		char name[16];
+
+		snprintf(name, sizeof(name), "clkin%d", i);
+		dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
+		if (IS_ERR(dwmac->m250_mux_parent[i])) {
+			ret = PTR_ERR(dwmac->m250_mux_parent[i]);
+			if (ret != -EPROBE_DEFER)
+				dev_err(dev, "Missing clock %s\n", name);
+			return ret;
+		}
+
+		mux_parent_names[i] =
+			__clk_get_name(dwmac->m250_mux_parent[i]);
+	}
+
+	/* create the m250_mux */
+	snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
+	init.name = clk_name;
+	init.ops = &clk_mux_ops;
+	init.flags = CLK_IS_BASIC;
+	init.parent_names = mux_parent_names;
+	init.num_parents = MUX_CLK_NUM_PARENTS;
+
+	dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
+	dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
+	dwmac->m250_mux.flags = 0;
+	dwmac->m250_mux.table = NULL;
+	dwmac->m250_mux.hw.init = &init;
+
+	dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
+	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m250_mux_clk)))
+		return PTR_ERR(dwmac->m250_mux_clk);
+
+	/* create the m250_div */
+	snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
+	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
+	init.ops = &clk_divider_ops;
+	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
+	clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
+	init.parent_names = clk_div_parents;
+	init.num_parents = ARRAY_SIZE(clk_div_parents);
+
+	dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
+	dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
+	dwmac->m250_div.hw.init = &init;
+	dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
+
+	dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);
+	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m250_div_clk)))
+		return PTR_ERR(dwmac->m250_div_clk);
+
+	/* create the m25_div */
+	snprintf(clk_name, sizeof(clk_name), "%s#m25_div", dev_name(dev));
+	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
+	init.ops = &clk_divider_ops;
+	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
+	clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
+	init.parent_names = clk_div_parents;
+	init.num_parents = ARRAY_SIZE(clk_div_parents);
+
+	dwmac->m25_div.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m25_div.shift = PRG_ETH0_CLK_M25_DIV_SHIFT;
+	dwmac->m25_div.width = PRG_ETH0_CLK_M25_DIV_WIDTH;
+	dwmac->m25_div.table = clk_25m_div_table;
+	dwmac->m25_div.hw.init = &init;
+	dwmac->m25_div.flags = CLK_DIVIDER_ALLOW_ZERO;
+
+	dwmac->m25_div_clk = devm_clk_register(dev, &dwmac->m25_div.hw);
+	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m25_div_clk)))
+		return PTR_ERR(dwmac->m25_div_clk);
+
+	return 0;
+}
+
+static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
+{
+	int ret;
+	unsigned long clk_rate;
+
+	switch (dwmac->phy_mode) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		/* Generate a 25MHz clock for the PHY */
+		clk_rate = 25 * 1000 * 1000;
+
+		/* enable RGMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
+					PRG_ETH0_RGMII_MODE);
+
+		/* only relevant for RMII mode -> disable in RGMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
+					PRG_ETH0_INVERTED_RMII_CLK, 0);
+
+		/* TX clock delay - all known boards use a 1/4 cycle delay */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
+					PRG_ETH0_TXDLY_QUARTER);
+		break;
+
+	case PHY_INTERFACE_MODE_RMII:
+		/* Use the rate of the mux clock for the internal RMII PHY */
+		clk_rate = clk_get_rate(dwmac->m250_mux_clk);
+
+		/* disable RGMII mode -> enables RMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
+					0);
+
+		/* invert internal clk_rmii_i to generate 25/2.5 tx_rx_clk */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
+					PRG_ETH0_INVERTED_RMII_CLK,
+					PRG_ETH0_INVERTED_RMII_CLK);
+
+		/* TX clock delay cannot be configured in RMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
+					0);
+
+		break;
+
+	default:
+		dev_err(&dwmac->pdev->dev, "unsupported phy-mode %s\n",
+			phy_modes(dwmac->phy_mode));
+		return -EINVAL;
+	}
+
+	ret = clk_prepare_enable(dwmac->m25_div_clk);
+	if (ret) {
+		dev_err(&dwmac->pdev->dev, "failed to enable the PHY clock\n");
+		return ret;
+	}
+
+	ret = clk_set_rate(dwmac->m25_div_clk, clk_rate);
+	if (ret) {
+		clk_disable_unprepare(dwmac->m25_div_clk);
+
+		dev_err(&dwmac->pdev->dev, "failed to set PHY clock\n");
+		return ret;
+	}
+
+	/* enable TX_CLK and PHY_REF_CLK generator */
+	meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
+				PRG_ETH0_TX_AND_PHY_REF_CLK);
+
+	return 0;
+}
+
+static int meson8b_dwmac_probe(struct platform_device *pdev)
+{
+	struct plat_stmmacenet_data *plat_dat;
+	struct stmmac_resources stmmac_res;
+	struct resource *res;
+	struct meson8b_dwmac *dwmac;
+	int ret;
+
+	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+	if (ret)
+		return ret;
+
+	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+	if (IS_ERR(plat_dat))
+		return PTR_ERR(plat_dat);
+
+	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+	if (!dwmac)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!res)
+		return -ENODEV;
+
+	dwmac->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(dwmac->regs))
+		return PTR_ERR(dwmac->regs);
+
+	dwmac->pdev = pdev;
+	dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
+	if (dwmac->phy_mode < 0) {
+		dev_err(&pdev->dev, "missing phy-mode property\n");
+		return -EINVAL;
+	}
+
+	ret = meson8b_init_clk(dwmac);
+	if (ret)
+		return ret;
+
+	ret = meson8b_init_prg_eth(dwmac);
+	if (ret)
+		return ret;
+
+	plat_dat->bsp_priv = dwmac;
+
+	platform_set_drvdata(pdev, dwmac);
+
+	return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+}
+
+static int meson8b_dwmac_remove(struct platform_device *pdev)
+{
+	struct meson8b_dwmac *dwmac = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(dwmac->m25_div_clk);
+
+	return stmmac_pltfr_remove(pdev);
+}
+
+static const struct of_device_id meson8b_dwmac_match[] = {
+	{ .compatible = "amlogic,meson8b-dwmac" },
+	{ .compatible = "amlogic,meson-gxbb-dwmac" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, meson8b_dwmac_match);
+
+static struct platform_driver meson8b_dwmac_driver = {
+	.probe  = meson8b_dwmac_probe,
+	.remove = meson8b_dwmac_remove,
+	.driver = {
+		.name           = "meson8b-dwmac",
+		.pm		= &stmmac_pltfr_pm_ops,
+		.of_match_table = meson8b_dwmac_match,
+	},
+};
+module_platform_driver(meson8b_dwmac_driver);
+
+MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
+MODULE_DESCRIPTION("Amlogic Meson S805/S905 DWMAC glue layer");
+MODULE_LICENSE("GPL v2");
-- 
2.9.3

[PATCH v2 4/4] ARM64: dts: meson-gxbb: use the new GXBB DWMAC glue driver

[Martin Blumenstingl]

The Amlogic reference driver uses the "mc_val" devicetree property to
configure the PRG_ETHERNET_ADDR0 register. Unfortunately it uses magic
values for this configuration.
According to the datasheet the PRG_ETHERNET_ADDR0 register is at address
0xc8834108. However, the reference driver uses 0xc8834540 instead.
According to my tests, the value from the reference driver is correct.

No changes are required to the board dts files because the only
required configuration option is the phy-mode, which had to be
configured correctly before as well.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
---
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index 4f42316..ab817d3 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
@@ -373,13 +373,15 @@
 		};
 
 		ethmac: ethernet@c9410000 {
-			compatible = "amlogic,meson6-dwmac", "snps,dwmac";
+			compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
 			reg = <0x0 0xc9410000 0x0 0x10000
 			       0x0 0xc8834540 0x0 0x4>;
 			interrupts = <0 8 1>;
 			interrupt-names = "macirq";
-			clocks = <&clkc CLKID_ETH>;
-			clock-names = "stmmaceth";
+			clocks = <&clkc CLKID_ETH>,
+				 <&clkc CLKID_FCLK_DIV2>,
+				 <&clkc CLKID_MPLL2>;
+			clock-names = "stmmaceth", "clkin0", "clkin1";
 			phy-mode = "rgmii";
 			status = "disabled";
 		};
-- 
2.9.3

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Re: [PATCH v2 3/4] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Joachim Eastwood]

Hi Martin,

On 20 August 2016 at 11:35, Martin Blumenstingl
<martin.blumenstingl@googlemail.com> wrote:
> The Ethernet controller available in Meson8b and GXBB SoCs is a Synopsys
> DesignWare MAC IP core which is already supported by the stmmac driver.
>
> In addition to the standard stmmac driver some Meson8b / GXBB specific
> registers have to be configured for the PHY clocks. These SoC specific
> registers are called PRG_ETHERNET_ADDR0 and PRG_ETHERNET_ADDR1 in the
> datasheet.
> These registers are not backwards compatible with those on Meson 6b,
> which is why a new glue driver is introduced. This worked for many
> boards because the bootloader programs the PRG_ETHERNET registers
> correctly. Additionally the meson6-dwmac driver only sets bit 1 of
> PRG_ETHERNET_ADDR0 which (according to the datasheet) is only used
> during reset.
>
> Currently all configuration values can be determined automatically,
> based on the configured phy-mode (which is mandatory for the stmmac
> driver). If required the tx-delay and the mux clock (so it supports
> the MPLL2 clock as well) can be made configurable in the future.
>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> Tested-by: Kevin Hilman <khilman@baylibre.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
>  .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    | 329 +++++++++++++++++++++
>  2 files changed, 330 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

<snip>

> +static int meson8b_dwmac_probe(struct platform_device *pdev)
> +{
> +       struct plat_stmmacenet_data *plat_dat;
> +       struct stmmac_resources stmmac_res;
> +       struct resource *res;
> +       struct meson8b_dwmac *dwmac;
> +       int ret;
> +
> +       ret = stmmac_get_platform_resources(pdev, &stmmac_res);
> +       if (ret)
> +               return ret;
> +
> +       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
> +       if (IS_ERR(plat_dat))
> +               return PTR_ERR(plat_dat);
> +
> +       dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
> +       if (!dwmac)
> +               return -ENOMEM;
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +       if (!res)
> +               return -ENODEV;
> +
> +       dwmac->regs = devm_ioremap_resource(&pdev->dev, res);
> +       if (IS_ERR(dwmac->regs))
> +               return PTR_ERR(dwmac->regs);
> +
> +       dwmac->pdev = pdev;
> +       dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
> +       if (dwmac->phy_mode < 0) {
> +               dev_err(&pdev->dev, "missing phy-mode property\n");
> +               return -EINVAL;
> +       }
> +
> +       ret = meson8b_init_clk(dwmac);
> +       if (ret)
> +               return ret;
> +
> +       ret = meson8b_init_prg_eth(dwmac);
> +       if (ret)
> +               return ret;
> +
> +       plat_dat->bsp_priv = dwmac;
> +
> +       platform_set_drvdata(pdev, dwmac);

This will not work. The main stmmac driver already uses the driver_data field.
See: http://lxr.free-electrons.com/source/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c#L3218


> +       return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);

So calling stmmac_dvr_probe here will overwrite the driver_data field.


> +}
> +
> +static int meson8b_dwmac_remove(struct platform_device *pdev)
> +{
> +       struct meson8b_dwmac *dwmac = platform_get_drvdata(pdev);
> +
> +       clk_disable_unprepare(dwmac->m25_div_clk);

Did you test this code? I am pretty sure it will blow up given that
driver_data is not set to what you expect.

To get your meson8b_dwmac struct you must retrieve it from plat_dat->bsp_priv.


I have some code for a helper to retrieve bsp_priv that I have meant
to sent to the ML for a while now.
See: https://github.com/manabian/linux-lpc/commit/c3e155a6e38b9634e4e61aa4eeb4602ede7e44a6

Feel free to add it to your patch set if you want.

Alternatively take a look at the remove function from dwmac-stm32 here:
https://patchwork.ozlabs.org/patch/619816/


> +
> +       return stmmac_pltfr_remove(pdev);
> +}


regards,
Joachim Eastwood

Re: [PATCH v2 3/4] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Martin Blumenstingl]

Hi Joachim,

On Sat, Aug 20, 2016 at 11:29 PM, Joachim  Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> +       platform_set_drvdata(pdev, dwmac);
>
> This will not work. The main stmmac driver already uses the driver_data field.
> See: http://lxr.free-electrons.com/source/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c#L3218
>
>
>> +       return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
>
> So calling stmmac_dvr_probe here will overwrite the driver_data field.
>
>
>> +}
>> +
>> +static int meson8b_dwmac_remove(struct platform_device *pdev)
>> +{
>> +       struct meson8b_dwmac *dwmac = platform_get_drvdata(pdev);
>> +
>> +       clk_disable_unprepare(dwmac->m25_div_clk);
>
> Did you test this code? I am pretty sure it will blow up given that
> driver_data is not set to what you expect.
I guess I should've taken a closer look at my kernel config:
CONFIG_DWMAC_MESON=y
Thanks for spotting this issue!

> To get your meson8b_dwmac struct you must retrieve it from plat_dat->bsp_priv.
>
>
> I have some code for a helper to retrieve bsp_priv that I have meant
> to sent to the ML for a while now.
> See: https://github.com/manabian/linux-lpc/commit/c3e155a6e38b9634e4e61aa4eeb4602ede7e44a6
>
> Feel free to add it to your patch set if you want.
>
> Alternatively take a look at the remove function from dwmac-stm32 here:
> https://patchwork.ozlabs.org/patch/619816/
excellent, thanks!

I will send a fixed version as soon as possible


Regards,
Martin
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Re: [PATCH v2 1/4] net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings

[Arnd Bergmann]

On Saturday, August 20, 2016 11:35:35 AM CEST Martin Blumenstingl wrote:
> +- reg: The first register range should be the one of the DWMAC
> +       controller. The second range is is for the Amlogic specific
> +       configuration (for example the PRG_ETHERNET register range
> +       on Meson8b and newer)
>  
...

> +Example for GXBB:
> +       ethmac: ethernet@c9410000 {
> +               compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
> +               reg = <0x0 0xc9410000 0x0 0x10000>,
> +                       <0x0 0xc8834540 0x0 0x8>;
> 

The address "0xc8834540" suggests that this is part of a larger register
range that is used for various things, i.e. a "syscon" type of device.

How about making this a syscon reference rather than a "reg" address?

	Arnd
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Re: [PATCH v2 1/4] net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings

[Martin Blumenstingl]

On Mon, Aug 22, 2016 at 1:55 PM, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org> wrote:
> On Saturday, August 20, 2016 11:35:35 AM CEST Martin Blumenstingl wrote:
>> +- reg: The first register range should be the one of the DWMAC
>> +       controller. The second range is is for the Amlogic specific
>> +       configuration (for example the PRG_ETHERNET register range
>> +       on Meson8b and newer)
>>
> ...
>
>> +Example for GXBB:
>> +       ethmac: ethernet@c9410000 {
>> +               compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
>> +               reg = <0x0 0xc9410000 0x0 0x10000>,
>> +                       <0x0 0xc8834540 0x0 0x8>;
>>
>
> The address "0xc8834540" suggests that this is part of a larger register
> range that is used for various things, i.e. a "syscon" type of device.
You are right, these are part of the cbus range (which is already
defined in meson-gxbb.dtsi)

> How about making this a syscon reference rather than a "reg" address?
The first version of my patch ([0]) used
syscon_regmap_lookup_by_phandle. Maybe I did it wrong (and I should
have passed the cbus syscon-node instead of defining a new one just
for the 2x32bit PRG_ETHERNET registers).
I am perfectly fine with either way - however it seems that some other
dwmac glue implementations are also using a second set of resources
(that doesn't automatically make it "correct" though).


Martin
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Re: [PATCH v2 1/4] net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings

[Arnd Bergmann]

On Monday, August 22, 2016 2:04:49 PM CEST Martin Blumenstingl wrote:
> On Mon, Aug 22, 2016 at 1:55 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> > On Saturday, August 20, 2016 11:35:35 AM CEST Martin Blumenstingl wrote:
> >> +- reg: The first register range should be the one of the DWMAC
> >> +       controller. The second range is is for the Amlogic specific
> >> +       configuration (for example the PRG_ETHERNET register range
> >> +       on Meson8b and newer)
> >>
> > ...
> >
> >> +Example for GXBB:
> >> +       ethmac: ethernet@c9410000 {
> >> +               compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
> >> +               reg = <0x0 0xc9410000 0x0 0x10000>,
> >> +                       <0x0 0xc8834540 0x0 0x8>;
> >>
> >
> > The address "0xc8834540" suggests that this is part of a larger register
> > range that is used for various things, i.e. a "syscon" type of device.
> You are right, these are part of the cbus range (which is already
> defined in meson-gxbb.dtsi)
> 
> > How about making this a syscon reference rather than a "reg" address?
> The first version of my patch ([0]) used
> syscon_regmap_lookup_by_phandle. Maybe I did it wrong (and I should
> have passed the cbus syscon-node instead of defining a new one just
> for the 2x32bit PRG_ETHERNET registers).
> I am perfectly fine with either way - however it seems that some other
> dwmac glue implementations are also using a second set of resources
> (that doesn't automatically make it "correct" though).

It really depends on the kind of SoC. Some may have a suboptimal
binding, on some others there may be a distinct register area that
just contains a few additional registers for the dwmac.

	Arnd

Re: [PATCH v2 1/4] net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings

[Martin Blumenstingl]

On Mon, Aug 22, 2016 at 5:25 PM, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org> wrote:
> It really depends on the kind of SoC. Some may have a suboptimal
> binding, on some others there may be a distinct register area that
> just contains a few additional registers for the dwmac.
the dwmac PHY configuration registers (2x32bit) on the GXBB SoC are
part of the "periphs" region/module. This is already defined as
"simple-bus" in meson-gxbb.dtsi, see [0]
On Meson8b this is slightly different: there is no specific "periphs"
region - there the dwmac PHY configuration registers are directly
located in the cbus region at a slightly different offset than on the
GXBB SoCs.

In the future we might need a third memory region because the latest
reference kernel contains some more PHY configuration registers on
newer SoCs (GXL = S905X).

Please let me know if you're OK with the dts definition in it's
current state - or let me know how you would like to change it.

PS: I will re-send the patches in a v3 in a few minutes because that
fixes a bug during module unload.


Regards,
Martin


[0] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi#n217
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[PATCH v3 0/5] meson: Meson8b and GXBB DWMAC glue driver

[Martin Blumenstingl]

This adds a DWMAC glue driver for the PRG_ETHERNET registers found in
Meson8b and GXBB SoCs. Based on the "old" meson6b-dwmac glue driver
the register layout is completely different.
Thus I introduced a separate driver.


Changes since v2:
- fixed unloading the glue driver when built as module. This pulls in a
  patch from Joachim Eastwood (thanks) to get our private data structure
  (bsp_priv).

Joachim Eastwood (1):
  stmmac: introduce get_stmmac_bsp_priv() helper

Martin Blumenstingl (4):
  net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings
  clk: gxbb: expose MPLL2 clock for use by DT
  net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC
  ARM64: dts: meson-gxbb: use the new GXBB DWMAC glue driver

 .../devicetree/bindings/net/meson-dwmac.txt        |  45 ++-
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   8 +-
 drivers/clk/meson/gxbb.h                           |   2 +-
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    | 327 +++++++++++++++++++++
 .../net/ethernet/stmicro/stmmac/stmmac_platform.h  |   8 +
 include/dt-bindings/clock/gxbb-clkc.h              |   1 +
 7 files changed, 380 insertions(+), 13 deletions(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

-- 
2.9.3

[PATCH v3 1/5] net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings

[Martin Blumenstingl]

This patch adds the documentation for the DWMAC ethernet controller
found in Amlogic Meson 8b (S805) and GXBB (S905) SoCs.
The main difference between the Meson6 glue is that different registers
(with different layout) are used.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 .../devicetree/bindings/net/meson-dwmac.txt        | 45 ++++++++++++++++++----
 1 file changed, 37 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/meson-dwmac.txt b/Documentation/devicetree/bindings/net/meson-dwmac.txt
index ec633d7..89e62dd 100644
--- a/Documentation/devicetree/bindings/net/meson-dwmac.txt
+++ b/Documentation/devicetree/bindings/net/meson-dwmac.txt
@@ -1,18 +1,32 @@
 * Amlogic Meson DWMAC Ethernet controller
 
 The device inherits all the properties of the dwmac/stmmac devices
-described in the file net/stmmac.txt with the following changes.
+described in the file stmmac.txt in the current directory with the
+following changes.
 
-Required properties:
+Required properties on all platforms:
 
-- compatible: should be "amlogic,meson6-dwmac" along with "snps,dwmac"
-	      and any applicable more detailed version number
-	      described in net/stmmac.txt
+- compatible:	Depending on the platform this should be one of:
+			- "amlogic,meson6-dwmac"
+			- "amlogic,meson8b-dwmac"
+			- "amlogic,meson-gxbb-dwmac"
+		Additionally "snps,dwmac" and any applicable more
+		detailed version number described in net/stmmac.txt
+		should be used.
 
-- reg: should contain a register range for the dwmac controller and
-       another one for the Amlogic specific configuration
+- reg:	The first register range should be the one of the DWMAC
+	controller. The second range is is for the Amlogic specific
+	configuration (for example the PRG_ETHERNET register range
+	on Meson8b and newer)
 
-Example:
+Required properties on Meson8b and newer:
+- clock-names:	Should contain the following:
+		- "stmmaceth" - see stmmac.txt
+		- "clkin0" - first parent clock of the internal mux
+		- "clkin1" - second parent clock of the internal mux
+
+
+Example for Meson6:
 
 	ethmac: ethernet@c9410000 {
 		compatible = "amlogic,meson6-dwmac", "snps,dwmac";
@@ -23,3 +37,18 @@ Example:
 		clocks = <&clk81>;
 		clock-names = "stmmaceth";
 	}
+
+Example for GXBB:
+	ethmac: ethernet@c9410000 {
+		compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
+		reg = <0x0 0xc9410000 0x0 0x10000>,
+			<0x0 0xc8834540 0x0 0x8>;
+		interrupts = <0 8 1>;
+		interrupt-names = "macirq";
+		clocks = <&clkc CLKID_ETH>,
+				<&clkc CLKID_FCLK_DIV2>,
+				<&clkc CLKID_MPLL2>;
+		clock-names = "stmmaceth", "clkin0", "clkin1";
+		phy-mode = "rgmii";
+		status = "disabled";
+	};
-- 
2.9.3

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[PATCH v3 2/5] clk: gxbb: expose MPLL2 clock for use by DT

[Martin Blumenstingl]

This exposes the MPLL2 clock as this is one of the input clocks of the
ethernet controller's internal mux.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/clk/meson/gxbb.h              | 2 +-
 include/dt-bindings/clock/gxbb-clkc.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/meson/gxbb.h b/drivers/clk/meson/gxbb.h
index 217df51..3606e875 100644
--- a/drivers/clk/meson/gxbb.h
+++ b/drivers/clk/meson/gxbb.h
@@ -183,7 +183,7 @@
 /* CLKID_CLK81 */
 #define CLKID_MPLL0		  13
 #define CLKID_MPLL1		  14
-#define CLKID_MPLL2		  15
+/* CLKID_MPLL2 */
 #define CLKID_DDR		  16
 #define CLKID_DOS		  17
 #define CLKID_ISA		  18
diff --git a/include/dt-bindings/clock/gxbb-clkc.h b/include/dt-bindings/clock/gxbb-clkc.h
index 7d41864..244ea6e 100644
--- a/include/dt-bindings/clock/gxbb-clkc.h
+++ b/include/dt-bindings/clock/gxbb-clkc.h
@@ -8,6 +8,7 @@
 #define CLKID_CPUCLK		1
 #define CLKID_FCLK_DIV2		4
 #define CLKID_CLK81		12
+#define CLKID_MPLL2		15
 #define CLKID_ETH		36
 #define CLKID_SD_EMMC_A		94
 #define CLKID_SD_EMMC_B		95
-- 
2.9.3

[PATCH v3 3/5] stmmac: introduce get_stmmac_bsp_priv() helper

[Martin Blumenstingl]

From: Joachim Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Create a helper to retrive dwmac private data from a dev
pointer. This is useful in PM callbacks and driver remove.

Signed-off-by: Joachim Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Tested-by: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
index ffeb8d9..64e147f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
@@ -30,4 +30,12 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
 int stmmac_pltfr_remove(struct platform_device *pdev);
 extern const struct dev_pm_ops stmmac_pltfr_pm_ops;
 
+static inline void *get_stmmac_bsp_priv(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+
+	return priv->plat->bsp_priv;
+}
+
 #endif /* __STMMAC_PLATFORM_H__ */
-- 
2.9.3

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[PATCH v3 4/5] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Martin Blumenstingl]

The Ethernet controller available in Meson8b and GXBB SoCs is a Synopsys
DesignWare MAC IP core which is already supported by the stmmac driver.

In addition to the standard stmmac driver some Meson8b / GXBB specific
registers have to be configured for the PHY clocks. These SoC specific
registers are called PRG_ETHERNET_ADDR0 and PRG_ETHERNET_ADDR1 in the
datasheet.
These registers are not backwards compatible with those on Meson 6b,
which is why a new glue driver is introduced. This worked for many
boards because the bootloader programs the PRG_ETHERNET registers
correctly. Additionally the meson6-dwmac driver only sets bit 1 of
PRG_ETHERNET_ADDR0 which (according to the datasheet) is only used
during reset.

Currently all configuration values can be determined automatically,
based on the configured phy-mode (which is mandatory for the stmmac
driver). If required the tx-delay and the mux clock (so it supports
the MPLL2 clock as well) can be made configurable in the future.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
---
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    | 327 +++++++++++++++++++++
 2 files changed, 328 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 44b630c..f77edb9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -9,7 +9,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
 obj-$(CONFIG_STMMAC_PLATFORM)	+= stmmac-platform.o
 obj-$(CONFIG_DWMAC_IPQ806X)	+= dwmac-ipq806x.o
 obj-$(CONFIG_DWMAC_LPC18XX)	+= dwmac-lpc18xx.o
-obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o
+obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o dwmac-meson8b.o
 obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rk.o
 obj-$(CONFIG_DWMAC_SOCFPGA)	+= dwmac-altr-socfpga.o
 obj-$(CONFIG_DWMAC_STI)		+= dwmac-sti.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
new file mode 100644
index 0000000..0f185e4
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -0,0 +1,327 @@
+/*
+ * Amlogic Meson S805/S905 DWMAC glue layer
+ *
+ * Copyright (C) 20016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/ethtool.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/of_net.h>
+#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/stmmac.h>
+
+#include "stmmac_platform.h"
+
+#define PRG_ETH0			0x0
+
+#define PRG_ETH0_RGMII_MODE		BIT(0)
+
+/* mux to choose between fclk_div2 (bit unset) and mpll2 (bit set) */
+#define PRG_ETH0_CLK_M250_SEL_SHIFT	4
+#define PRG_ETH0_CLK_M250_SEL_MASK	GENMASK(4, 4)
+
+#define PRG_ETH0_TXDLY_SHIFT		5
+#define PRG_ETH0_TXDLY_MASK		GENMASK(6, 5)
+#define PRG_ETH0_TXDLY_OFF		(0x0 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_QUARTER		(0x1 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_HALF		(0x2 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_THREE_QUARTERS	(0x3 << PRG_ETH0_TXDLY_SHIFT)
+
+/* divider for the result of m250_sel */
+#define PRG_ETH0_CLK_M250_DIV_SHIFT	7
+#define PRG_ETH0_CLK_M250_DIV_WIDTH	3
+
+/* divides the result of m25_sel by either 5 (bit unset) or 10 (bit set) */
+#define PRG_ETH0_CLK_M25_DIV_SHIFT	10
+#define PRG_ETH0_CLK_M25_DIV_WIDTH	1
+
+#define PRG_ETH0_INVERTED_RMII_CLK	BIT(11)
+#define PRG_ETH0_TX_AND_PHY_REF_CLK	BIT(12)
+
+#define MUX_CLK_NUM_PARENTS		2
+
+struct meson8b_dwmac {
+	struct platform_device	*pdev;
+
+	void __iomem		*regs;
+
+	phy_interface_t		phy_mode;
+
+	struct clk_mux		m250_mux;
+	struct clk		*m250_mux_clk;
+	struct clk		*m250_mux_parent[MUX_CLK_NUM_PARENTS];
+
+	struct clk_divider	m250_div;
+	struct clk		*m250_div_clk;
+
+	struct clk_divider	m25_div;
+	struct clk		*m25_div_clk;
+};
+
+static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
+				    u32 mask, u32 value)
+{
+	u32 data;
+
+	data = readl(dwmac->regs + reg);
+	data &= ~mask;
+	data |= (value & mask);
+
+	writel(data, dwmac->regs + reg);
+}
+
+static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
+{
+	struct clk_init_data init;
+	int i, ret;
+	struct device *dev = &dwmac->pdev->dev;
+	char clk_name[32];
+	const char *clk_div_parents[1];
+	const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
+	static struct clk_div_table clk_25m_div_table[] = {
+		{ .val = 0, .div = 5 },
+		{ .val = 1, .div = 10 },
+		{ /* sentinel */ },
+	};
+
+	/* get the mux parents from DT */
+	for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
+		char name[16];
+
+		snprintf(name, sizeof(name), "clkin%d", i);
+		dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
+		if (IS_ERR(dwmac->m250_mux_parent[i])) {
+			ret = PTR_ERR(dwmac->m250_mux_parent[i]);
+			if (ret != -EPROBE_DEFER)
+				dev_err(dev, "Missing clock %s\n", name);
+			return ret;
+		}
+
+		mux_parent_names[i] =
+			__clk_get_name(dwmac->m250_mux_parent[i]);
+	}
+
+	/* create the m250_mux */
+	snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
+	init.name = clk_name;
+	init.ops = &clk_mux_ops;
+	init.flags = CLK_IS_BASIC;
+	init.parent_names = mux_parent_names;
+	init.num_parents = MUX_CLK_NUM_PARENTS;
+
+	dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
+	dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
+	dwmac->m250_mux.flags = 0;
+	dwmac->m250_mux.table = NULL;
+	dwmac->m250_mux.hw.init = &init;
+
+	dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
+	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m250_mux_clk)))
+		return PTR_ERR(dwmac->m250_mux_clk);
+
+	/* create the m250_div */
+	snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
+	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
+	init.ops = &clk_divider_ops;
+	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
+	clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
+	init.parent_names = clk_div_parents;
+	init.num_parents = ARRAY_SIZE(clk_div_parents);
+
+	dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
+	dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
+	dwmac->m250_div.hw.init = &init;
+	dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
+
+	dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);
+	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m250_div_clk)))
+		return PTR_ERR(dwmac->m250_div_clk);
+
+	/* create the m25_div */
+	snprintf(clk_name, sizeof(clk_name), "%s#m25_div", dev_name(dev));
+	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
+	init.ops = &clk_divider_ops;
+	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
+	clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
+	init.parent_names = clk_div_parents;
+	init.num_parents = ARRAY_SIZE(clk_div_parents);
+
+	dwmac->m25_div.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m25_div.shift = PRG_ETH0_CLK_M25_DIV_SHIFT;
+	dwmac->m25_div.width = PRG_ETH0_CLK_M25_DIV_WIDTH;
+	dwmac->m25_div.table = clk_25m_div_table;
+	dwmac->m25_div.hw.init = &init;
+	dwmac->m25_div.flags = CLK_DIVIDER_ALLOW_ZERO;
+
+	dwmac->m25_div_clk = devm_clk_register(dev, &dwmac->m25_div.hw);
+	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m25_div_clk)))
+		return PTR_ERR(dwmac->m25_div_clk);
+
+	return 0;
+}
+
+static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
+{
+	int ret;
+	unsigned long clk_rate;
+
+	switch (dwmac->phy_mode) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		/* Generate a 25MHz clock for the PHY */
+		clk_rate = 25 * 1000 * 1000;
+
+		/* enable RGMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
+					PRG_ETH0_RGMII_MODE);
+
+		/* only relevant for RMII mode -> disable in RGMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
+					PRG_ETH0_INVERTED_RMII_CLK, 0);
+
+		/* TX clock delay - all known boards use a 1/4 cycle delay */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
+					PRG_ETH0_TXDLY_QUARTER);
+		break;
+
+	case PHY_INTERFACE_MODE_RMII:
+		/* Use the rate of the mux clock for the internal RMII PHY */
+		clk_rate = clk_get_rate(dwmac->m250_mux_clk);
+
+		/* disable RGMII mode -> enables RMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
+					0);
+
+		/* invert internal clk_rmii_i to generate 25/2.5 tx_rx_clk */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
+					PRG_ETH0_INVERTED_RMII_CLK,
+					PRG_ETH0_INVERTED_RMII_CLK);
+
+		/* TX clock delay cannot be configured in RMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
+					0);
+
+		break;
+
+	default:
+		dev_err(&dwmac->pdev->dev, "unsupported phy-mode %s\n",
+			phy_modes(dwmac->phy_mode));
+		return -EINVAL;
+	}
+
+	ret = clk_prepare_enable(dwmac->m25_div_clk);
+	if (ret) {
+		dev_err(&dwmac->pdev->dev, "failed to enable the PHY clock\n");
+		return ret;
+	}
+
+	ret = clk_set_rate(dwmac->m25_div_clk, clk_rate);
+	if (ret) {
+		clk_disable_unprepare(dwmac->m25_div_clk);
+
+		dev_err(&dwmac->pdev->dev, "failed to set PHY clock\n");
+		return ret;
+	}
+
+	/* enable TX_CLK and PHY_REF_CLK generator */
+	meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
+				PRG_ETH0_TX_AND_PHY_REF_CLK);
+
+	return 0;
+}
+
+static int meson8b_dwmac_probe(struct platform_device *pdev)
+{
+	struct plat_stmmacenet_data *plat_dat;
+	struct stmmac_resources stmmac_res;
+	struct resource *res;
+	struct meson8b_dwmac *dwmac;
+	int ret;
+
+	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+	if (ret)
+		return ret;
+
+	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+	if (IS_ERR(plat_dat))
+		return PTR_ERR(plat_dat);
+
+	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+	if (!dwmac)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!res)
+		return -ENODEV;
+
+	dwmac->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(dwmac->regs))
+		return PTR_ERR(dwmac->regs);
+
+	dwmac->pdev = pdev;
+	dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
+	if (dwmac->phy_mode < 0) {
+		dev_err(&pdev->dev, "missing phy-mode property\n");
+		return -EINVAL;
+	}
+
+	ret = meson8b_init_clk(dwmac);
+	if (ret)
+		return ret;
+
+	ret = meson8b_init_prg_eth(dwmac);
+	if (ret)
+		return ret;
+
+	plat_dat->bsp_priv = dwmac;
+
+	return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+}
+
+static int meson8b_dwmac_remove(struct platform_device *pdev)
+{
+	struct meson8b_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
+
+	clk_disable_unprepare(dwmac->m25_div_clk);
+
+	return stmmac_pltfr_remove(pdev);
+}
+
+static const struct of_device_id meson8b_dwmac_match[] = {
+	{ .compatible = "amlogic,meson8b-dwmac" },
+	{ .compatible = "amlogic,meson-gxbb-dwmac" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, meson8b_dwmac_match);
+
+static struct platform_driver meson8b_dwmac_driver = {
+	.probe  = meson8b_dwmac_probe,
+	.remove = meson8b_dwmac_remove,
+	.driver = {
+		.name           = "meson8b-dwmac",
+		.pm		= &stmmac_pltfr_pm_ops,
+		.of_match_table = meson8b_dwmac_match,
+	},
+};
+module_platform_driver(meson8b_dwmac_driver);
+
+MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
+MODULE_DESCRIPTION("Amlogic Meson S805/S905 DWMAC glue layer");
+MODULE_LICENSE("GPL v2");
-- 
2.9.3

[PATCH v3 5/5] ARM64: dts: meson-gxbb: use the new GXBB DWMAC glue driver

[Martin Blumenstingl]

The Amlogic reference driver uses the "mc_val" devicetree property to
configure the PRG_ETHERNET_ADDR0 register. Unfortunately it uses magic
values for this configuration.
According to the datasheet the PRG_ETHERNET_ADDR0 register is at address
0xc8834108. However, the reference driver uses 0xc8834540 instead.
According to my tests, the value from the reference driver is correct.

No changes are required to the board dts files because the only
required configuration option is the phy-mode, which had to be
configured correctly before as well.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index 4f42316..ab817d3 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
@@ -373,13 +373,15 @@
 		};
 
 		ethmac: ethernet@c9410000 {
-			compatible = "amlogic,meson6-dwmac", "snps,dwmac";
+			compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
 			reg = <0x0 0xc9410000 0x0 0x10000
 			       0x0 0xc8834540 0x0 0x4>;
 			interrupts = <0 8 1>;
 			interrupt-names = "macirq";
-			clocks = <&clkc CLKID_ETH>;
-			clock-names = "stmmaceth";
+			clocks = <&clkc CLKID_ETH>,
+				 <&clkc CLKID_FCLK_DIV2>,
+				 <&clkc CLKID_MPLL2>;
+			clock-names = "stmmaceth", "clkin0", "clkin1";
 			phy-mode = "rgmii";
 			status = "disabled";
 		};
-- 
2.9.3

Re: [PATCH v3 0/5] meson: Meson8b and GXBB DWMAC glue driver

[David Miller]

From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Date: Sun, 28 Aug 2016 18:16:32 +0200

> This adds a DWMAC glue driver for the PRG_ETHERNET registers found in
> Meson8b and GXBB SoCs. Based on the "old" meson6b-dwmac glue driver
> the register layout is completely different.
> Thus I introduced a separate driver.
> 
> Changes since v2:
> - fixed unloading the glue driver when built as module. This pulls in a
>   patch from Joachim Eastwood (thanks) to get our private data structure
>   (bsp_priv).

This doesn't apply cleanly at all to the net-next tree, so I have
no idea where you expect these changes to be applied.

Re: [PATCH v2 1/4] net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings

[Arnd Bergmann]

On Sunday 28 August 2016, Martin Blumenstingl wrote:
> On Mon, Aug 22, 2016 at 5:25 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> > It really depends on the kind of SoC. Some may have a suboptimal
> > binding, on some others there may be a distinct register area that
> > just contains a few additional registers for the dwmac.
> the dwmac PHY configuration registers (2x32bit) on the GXBB SoC are
> part of the "periphs" region/module. This is already defined as
> "simple-bus" in meson-gxbb.dtsi, see [0]
> On Meson8b this is slightly different: there is no specific "periphs"
> region - there the dwmac PHY configuration registers are directly
> located in the cbus region at a slightly different offset than on the
> GXBB SoCs.
> 
> In the future we might need a third memory region because the latest
> reference kernel contains some more PHY configuration registers on
> newer SoCs (GXL = S905X).
> 
> Please let me know if you're OK with the dts definition in it's
> current state - or let me know how you would like to change it.
> 
> PS: I will re-send the patches in a v3 in a few minutes because that
> fixes a bug during module unload.

I don't really see a good way to describe this hardware then. If it
was only the first case, I'd suggest marking the periphs bus node
as "compatible="simple-bus","syscon";" so you could have a
reference to it, but that doesn't seem to work well in the second
case, unless you can a separate DT node just for the PHY config
registers there.

With the third case, is there any logic at all behind the
register map?

Maybe someone else has a better idea for how to describe this.
In general, we try to avoid overlapping "reg" properties, but I
even see that the "periphs" node  on gxbb has a "reg" property
(is this intentional) that overlaps with the registers in its
ranges, so adding another one won't make this worse than it
already is.

	Arnd

Re: [PATCH v3 0/5] meson: Meson8b and GXBB DWMAC glue driver

[Martin Blumenstingl]

On Mon, Aug 29, 2016 at 5:40 AM, David Miller <davem@davemloft.net> wrote:
> From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> Date: Sun, 28 Aug 2016 18:16:32 +0200
>
>> This adds a DWMAC glue driver for the PRG_ETHERNET registers found in
>> Meson8b and GXBB SoCs. Based on the "old" meson6b-dwmac glue driver
>> the register layout is completely different.
>> Thus I introduced a separate driver.
>>
>> Changes since v2:
>> - fixed unloading the glue driver when built as module. This pulls in a
>>   patch from Joachim Eastwood (thanks) to get our private data structure
>>   (bsp_priv).
>
> This doesn't apply cleanly at all to the net-next tree, so I have
> no idea where you expect these changes to be applied.
OK, maybe Kevin can me help out here as I think the patches should go
to various trees.

I think patches 1, 3 and 4 should go through the net-next tree (as
these touch drivers/net/ethernet/stmicro/stmmac/ and the corresponding
documentation).
Patch 2 should probably go through clk-meson-gxbb / clk-next (just
like the other clk changes we had).
The last patch (patch 5) should probably go through the ARM SoC tree
(just like the other dts changes we had).

@David, Kevin: would this be fine for you?

Re: [PATCH v3 4/5] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Stephen Boyd]

On 08/28, Martin Blumenstingl wrote:
> +static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
> +{
> +	struct clk_init_data init;
> +	int i, ret;
> +	struct device *dev = &dwmac->pdev->dev;
> +	char clk_name[32];
> +	const char *clk_div_parents[1];
> +	const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
> +	static struct clk_div_table clk_25m_div_table[] = {
> +		{ .val = 0, .div = 5 },
> +		{ .val = 1, .div = 10 },
> +		{ /* sentinel */ },
> +	};
> +
> +	/* get the mux parents from DT */
> +	for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
> +		char name[16];
> +
> +		snprintf(name, sizeof(name), "clkin%d", i);
> +		dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
> +		if (IS_ERR(dwmac->m250_mux_parent[i])) {
> +			ret = PTR_ERR(dwmac->m250_mux_parent[i]);
> +			if (ret != -EPROBE_DEFER)
> +				dev_err(dev, "Missing clock %s\n", name);
> +			return ret;
> +		}
> +
> +		mux_parent_names[i] =
> +			__clk_get_name(dwmac->m250_mux_parent[i]);
> +	}
> +
> +	/* create the m250_mux */
> +	snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
> +	init.name = clk_name;
> +	init.ops = &clk_mux_ops;
> +	init.flags = CLK_IS_BASIC;

Please don't use this flag unless you need it.

> +	init.parent_names = mux_parent_names;
> +	init.num_parents = MUX_CLK_NUM_PARENTS;
> +
> +	dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
> +	dwmac->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
> +	dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
> +	dwmac->m250_mux.flags = 0;
> +	dwmac->m250_mux.table = NULL;
> +	dwmac->m250_mux.hw.init = &init;
> +
> +	dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
> +	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m250_mux_clk)))

Why not if(WARN_ON(IS_ERR())? The OR_ZERO part seems confusing.

> +		return PTR_ERR(dwmac->m250_mux_clk);
> +
> +	/* create the m250_div */
> +	snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
> +	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
> +	init.ops = &clk_divider_ops;
> +	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
> +	clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
> +	init.parent_names = clk_div_parents;
> +	init.num_parents = ARRAY_SIZE(clk_div_parents);
> +
> +	dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
> +	dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
> +	dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
> +	dwmac->m250_div.hw.init = &init;
> +	dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
> +
> +	dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);

We've been trying to move away from devm_clk_register() to
devm_clk_hw_register() so that clk providers aren't also clk
consumers. Obviously in this case this driver is a provider and a
consumer, so this isn't as important. Kevin did something similar
in the mmc driver, so I'll reiterate what I said on that patch.
Perhaps we should make __clk_create_clk() into a real clk
provider API so that we can use devm_clk_hw_register() here and
then generate a clk for this device. That would allow us to have
proper consumer tracking without relying on the clk that is
returned from clk_register() (the intent is to make that clk
instance internal to the framework).

> +	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m250_div_clk)))
> +		return PTR_ERR(dwmac->m250_div_clk);
> +
> +	/* create the m25_div */
> +	snprintf(clk_name, sizeof(clk_name), "%s#m25_div", dev_name(dev));
> +	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
> +	init.ops = &clk_divider_ops;
> +	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
> +	clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
> +	init.parent_names = clk_div_parents;
> +	init.num_parents = ARRAY_SIZE(clk_div_parents);
> +
> +	dwmac->m25_div.reg = dwmac->regs + PRG_ETH0;
> +	dwmac->m25_div.shift = PRG_ETH0_CLK_M25_DIV_SHIFT;
> +	dwmac->m25_div.width = PRG_ETH0_CLK_M25_DIV_WIDTH;
> +	dwmac->m25_div.table = clk_25m_div_table;
> +	dwmac->m25_div.hw.init = &init;
> +	dwmac->m25_div.flags = CLK_DIVIDER_ALLOW_ZERO;
> +
> +	dwmac->m25_div_clk = devm_clk_register(dev, &dwmac->m25_div.hw);
> +	if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m25_div_clk)))
> +		return PTR_ERR(dwmac->m25_div_clk);
> +
> +	return 0;

This could be return WARN_ON(PTR_ERR_OR_ZERO(...))

> +
> +static int meson8b_dwmac_probe(struct platform_device *pdev)
> +{
> +	struct plat_stmmacenet_data *plat_dat;
> +	struct stmmac_resources stmmac_res;
> +	struct resource *res;
> +	struct meson8b_dwmac *dwmac;
> +	int ret;
> +
> +	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
> +	if (ret)
> +		return ret;
> +
> +	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
> +	if (IS_ERR(plat_dat))
> +		return PTR_ERR(plat_dat);
> +
> +	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
> +	if (!dwmac)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	if (!res)
> +		return -ENODEV;
> +

You can drop the above two lines and just call
devm_ioremap_resource().

> +	dwmac->regs = devm_ioremap_resource(&pdev->dev, res);

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v3 0/5] meson: Meson8b and GXBB DWMAC glue driver

[David Miller]

From: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
Date: Tue, 30 Aug 2016 20:49:28 +0200

> On Mon, Aug 29, 2016 at 5:40 AM, David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org> wrote:
>> From: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
>> Date: Sun, 28 Aug 2016 18:16:32 +0200
>>
>>> This adds a DWMAC glue driver for the PRG_ETHERNET registers found in
>>> Meson8b and GXBB SoCs. Based on the "old" meson6b-dwmac glue driver
>>> the register layout is completely different.
>>> Thus I introduced a separate driver.
>>>
>>> Changes since v2:
>>> - fixed unloading the glue driver when built as module. This pulls in a
>>>   patch from Joachim Eastwood (thanks) to get our private data structure
>>>   (bsp_priv).
>>
>> This doesn't apply cleanly at all to the net-next tree, so I have
>> no idea where you expect these changes to be applied.
> OK, maybe Kevin can me help out here as I think the patches should go
> to various trees.
> 
> I think patches 1, 3 and 4 should go through the net-next tree (as
> these touch drivers/net/ethernet/stmicro/stmmac/ and the corresponding
> documentation).
> Patch 2 should probably go through clk-meson-gxbb / clk-next (just
> like the other clk changes we had).
> The last patch (patch 5) should probably go through the ARM SoC tree
> (just like the other dts changes we had).
> 
> @David, Kevin: would this be fine for you?

I would prefer if all of the patches went through one tree, that way
all the dependencies are satisfied in one place.
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Re: [PATCH v3 0/5] meson: Meson8b and GXBB DWMAC glue driver

[Kevin Hilman]

David Miller <davem@davemloft.net> writes:

> From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> Date: Tue, 30 Aug 2016 20:49:28 +0200
>
>> On Mon, Aug 29, 2016 at 5:40 AM, David Miller <davem@davemloft.net> wrote:
>>> From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
>>> Date: Sun, 28 Aug 2016 18:16:32 +0200
>>>
>>>> This adds a DWMAC glue driver for the PRG_ETHERNET registers found in
>>>> Meson8b and GXBB SoCs. Based on the "old" meson6b-dwmac glue driver
>>>> the register layout is completely different.
>>>> Thus I introduced a separate driver.
>>>>
>>>> Changes since v2:
>>>> - fixed unloading the glue driver when built as module. This pulls in a
>>>>   patch from Joachim Eastwood (thanks) to get our private data structure
>>>>   (bsp_priv).
>>>
>>> This doesn't apply cleanly at all to the net-next tree, so I have
>>> no idea where you expect these changes to be applied.
>> OK, maybe Kevin can me help out here as I think the patches should go
>> to various trees.
>> 
>> I think patches 1, 3 and 4 should go through the net-next tree (as
>> these touch drivers/net/ethernet/stmicro/stmmac/ and the corresponding
>> documentation).
>> Patch 2 should probably go through clk-meson-gxbb / clk-next (just
>> like the other clk changes we had).
>> The last patch (patch 5) should probably go through the ARM SoC tree
>> (just like the other dts changes we had).
>> 
>> @David, Kevin: would this be fine for you?
>
> I would prefer if all of the patches went through one tree, that way
> all the dependencies are satisfied in one place.

David, with your ack on the drivers/net changes, I can take them through
my tree for Amlogic SoCs (which then goes via the arm-soc tree.)

Note that there may be some minor tweaks yet to the clock handling based
on review comments.

Thanks,

Kevin

Re: [PATCH v3 0/5] meson: Meson8b and GXBB DWMAC glue driver

[David Miller]

From: Kevin Hilman <khilman@baylibre.com>
Date: Thu, 01 Sep 2016 21:23:52 -0700

> David Miller <davem@davemloft.net> writes:
> 
>> From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
>> Date: Tue, 30 Aug 2016 20:49:28 +0200
>>
>>> On Mon, Aug 29, 2016 at 5:40 AM, David Miller <davem@davemloft.net> wrote:
>>>> From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
>>>> Date: Sun, 28 Aug 2016 18:16:32 +0200
>>>>
>>>>> This adds a DWMAC glue driver for the PRG_ETHERNET registers found in
>>>>> Meson8b and GXBB SoCs. Based on the "old" meson6b-dwmac glue driver
>>>>> the register layout is completely different.
>>>>> Thus I introduced a separate driver.
>>>>>
>>>>> Changes since v2:
>>>>> - fixed unloading the glue driver when built as module. This pulls in a
>>>>>   patch from Joachim Eastwood (thanks) to get our private data structure
>>>>>   (bsp_priv).
>>>>
>>>> This doesn't apply cleanly at all to the net-next tree, so I have
>>>> no idea where you expect these changes to be applied.
>>> OK, maybe Kevin can me help out here as I think the patches should go
>>> to various trees.
>>> 
>>> I think patches 1, 3 and 4 should go through the net-next tree (as
>>> these touch drivers/net/ethernet/stmicro/stmmac/ and the corresponding
>>> documentation).
>>> Patch 2 should probably go through clk-meson-gxbb / clk-next (just
>>> like the other clk changes we had).
>>> The last patch (patch 5) should probably go through the ARM SoC tree
>>> (just like the other dts changes we had).
>>> 
>>> @David, Kevin: would this be fine for you?
>>
>> I would prefer if all of the patches went through one tree, that way
>> all the dependencies are satisfied in one place.
> 
> David, with your ack on the drivers/net changes, I can take them through
> my tree for Amlogic SoCs (which then goes via the arm-soc tree.)

Acked-by: David S. Miller <davem@davemloft.net>

Re: [PATCH v3 0/5] meson: Meson8b and GXBB DWMAC glue driver

[Arnd Bergmann]

On Thursday, September 1, 2016 10:37:31 PM CEST David Miller wrote:
> From: Kevin Hilman <khilman@baylibre.com>
> Date: Thu, 01 Sep 2016 21:23:52 -0700
> > David Miller <davem@davemloft.net> writes:
> >> From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> >> Date: Tue, 30 Aug 2016 20:49:28 +0200
> >>> On Mon, Aug 29, 2016 at 5:40 AM, David Miller <davem@davemloft.net> wrote:
> >>>> From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> >>> I think patches 1, 3 and 4 should go through the net-next tree (as
> >>> these touch drivers/net/ethernet/stmicro/stmmac/ and the corresponding
> >>> documentation).
> >>> Patch 2 should probably go through clk-meson-gxbb / clk-next (just
> >>> like the other clk changes we had).
> >>> The last patch (patch 5) should probably go through the ARM SoC tree
> >>> (just like the other dts changes we had).
> >>> 
> >>> @David, Kevin: would this be fine for you?
> >>
> >> I would prefer if all of the patches went through one tree, that way
> >> all the dependencies are satisfied in one place.
> > 
> > David, with your ack on the drivers/net changes, I can take them through
> > my tree for Amlogic SoCs (which then goes via the arm-soc tree.)
> 
> Acked-by: David S. Miller <davem@davemloft.net>

Thanks!

Note that we (in arm-soc) normally put drivers and DT changes into
separate branches and send a pull request for each branch separately
(though usually on the same day).

We expect there to be no runtime dependency between the DT changes
and the driver changes other than requiring both to make use of
the added features.

Kevin/Martin: in case this one does have a runtime dependency,
please we can put both halves into the next/drivers branch in
the correct order to ensure that they are applied together, and
describe the dependency in the cover letter for the pull request.

	Arnd

Re: [PATCH v3 4/5] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Martin Blumenstingl]

On Tue, Aug 30, 2016 at 9:19 PM, Stephen Boyd <sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> wrote:
>> +             return PTR_ERR(dwmac->m250_mux_clk);
>> +
>> +     /* create the m250_div */
>> +     snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
>> +     init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
>> +     init.ops = &clk_divider_ops;
>> +     init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
>> +     clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
>> +     init.parent_names = clk_div_parents;
>> +     init.num_parents = ARRAY_SIZE(clk_div_parents);
>> +
>> +     dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
>> +     dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
>> +     dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
>> +     dwmac->m250_div.hw.init = &init;
>> +     dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
>> +
>> +     dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);
>
> We've been trying to move away from devm_clk_register() to
> devm_clk_hw_register() so that clk providers aren't also clk
> consumers. Obviously in this case this driver is a provider and a
> consumer, so this isn't as important. Kevin did something similar
> in the mmc driver, so I'll reiterate what I said on that patch.
> Perhaps we should make __clk_create_clk() into a real clk
> provider API so that we can use devm_clk_hw_register() here and
> then generate a clk for this device. That would allow us to have
> proper consumer tracking without relying on the clk that is
> returned from clk_register() (the intent is to make that clk
> instance internal to the framework).
please correct me if I'm wrong but I read this as "this code is OK for
now, but it should be changed once the clk framework has API for
that".
If still you want me to change the code then please send a NACK
(preferably on the updated series which I am preparing right now).

>> +     if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m250_div_clk)))
>> +             return PTR_ERR(dwmac->m250_div_clk);
>> +
>> +     /* create the m25_div */
>> +     snprintf(clk_name, sizeof(clk_name), "%s#m25_div", dev_name(dev));
>> +     init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
>> +     init.ops = &clk_divider_ops;
>> +     init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
>> +     clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
>> +     init.parent_names = clk_div_parents;
>> +     init.num_parents = ARRAY_SIZE(clk_div_parents);
>> +
>> +     dwmac->m25_div.reg = dwmac->regs + PRG_ETH0;
>> +     dwmac->m25_div.shift = PRG_ETH0_CLK_M25_DIV_SHIFT;
>> +     dwmac->m25_div.width = PRG_ETH0_CLK_M25_DIV_WIDTH;
>> +     dwmac->m25_div.table = clk_25m_div_table;
>> +     dwmac->m25_div.hw.init = &init;
>> +     dwmac->m25_div.flags = CLK_DIVIDER_ALLOW_ZERO;
>> +
>> +     dwmac->m25_div_clk = devm_clk_register(dev, &dwmac->m25_div.hw);
>> +     if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m25_div_clk)))
>> +             return PTR_ERR(dwmac->m25_div_clk);
>> +
>> +     return 0;
>
> This could be return WARN_ON(PTR_ERR_OR_ZERO(...))
This would work as well but I prefer the way it is right now (as one
could easily extend the code without having to touch any existing code
apart from the last return).
However, as it's always the case with personal preference: if
coding-style requires me to change it then I'll do so, just let me
know.

I have addressed all other issues you found (thanks for that!) in v4
(which I am about to send in the next few minutes).


Thanks,
Martin
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[PATCH v4 0/5] meson: Meson8b and GXBB DWMAC glue driver

[Martin Blumenstingl]

This adds a DWMAC glue driver for the PRG_ETHERNET registers found in
Meson8b and GXBB SoCs. Based on the "old" meson6b-dwmac glue driver
the register layout is completely different.
Thus I introduced a separate driver.


Changes since v3:
- remove (unnecessary) usage of CLK_IS_BASIC flag
- use WARN_ON(IS_ERR(...)) instead of WARN_ON(PTR_ERR_OR_ZERO(...))
- let devm_ioremap_resource() check the result returned by
  platform_get_resource()
- added David Miller's ACKs to the patches which would be relevant for
  the net-next tree (patches 1, 3 and 4) as per
  http://lists.infradead.org/pipermail/linux-amlogic/2016-September/000995.html
- fixed typo in copyright year

Joachim Eastwood (1):
  stmmac: introduce get_stmmac_bsp_priv() helper

Martin Blumenstingl (4):
  net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings
  clk: gxbb: expose MPLL2 clock for use by DT
  net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC
  ARM64: dts: meson-gxbb: use the new GXBB DWMAC glue driver

 .../devicetree/bindings/net/meson-dwmac.txt        |  45 ++-
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   8 +-
 drivers/clk/meson/gxbb.h                           |   2 +-
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    | 324 +++++++++++++++++++++
 .../net/ethernet/stmicro/stmmac/stmmac_platform.h  |   8 +
 include/dt-bindings/clock/gxbb-clkc.h              |   1 +
 7 files changed, 377 insertions(+), 13 deletions(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

-- 
2.9.3

[PATCH v4 1/5] net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings

[Martin Blumenstingl]

This patch adds the documentation for the DWMAC ethernet controller
found in Amlogic Meson 8b (S805) and GXBB (S905) SoCs.
The main difference between the Meson6 glue is that different registers
(with different layout) are used.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
---
 .../devicetree/bindings/net/meson-dwmac.txt        | 45 ++++++++++++++++++----
 1 file changed, 37 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/meson-dwmac.txt b/Documentation/devicetree/bindings/net/meson-dwmac.txt
index ec633d7..89e62dd 100644
--- a/Documentation/devicetree/bindings/net/meson-dwmac.txt
+++ b/Documentation/devicetree/bindings/net/meson-dwmac.txt
@@ -1,18 +1,32 @@
 * Amlogic Meson DWMAC Ethernet controller
 
 The device inherits all the properties of the dwmac/stmmac devices
-described in the file net/stmmac.txt with the following changes.
+described in the file stmmac.txt in the current directory with the
+following changes.
 
-Required properties:
+Required properties on all platforms:
 
-- compatible: should be "amlogic,meson6-dwmac" along with "snps,dwmac"
-	      and any applicable more detailed version number
-	      described in net/stmmac.txt
+- compatible:	Depending on the platform this should be one of:
+			- "amlogic,meson6-dwmac"
+			- "amlogic,meson8b-dwmac"
+			- "amlogic,meson-gxbb-dwmac"
+		Additionally "snps,dwmac" and any applicable more
+		detailed version number described in net/stmmac.txt
+		should be used.
 
-- reg: should contain a register range for the dwmac controller and
-       another one for the Amlogic specific configuration
+- reg:	The first register range should be the one of the DWMAC
+	controller. The second range is is for the Amlogic specific
+	configuration (for example the PRG_ETHERNET register range
+	on Meson8b and newer)
 
-Example:
+Required properties on Meson8b and newer:
+- clock-names:	Should contain the following:
+		- "stmmaceth" - see stmmac.txt
+		- "clkin0" - first parent clock of the internal mux
+		- "clkin1" - second parent clock of the internal mux
+
+
+Example for Meson6:
 
 	ethmac: ethernet@c9410000 {
 		compatible = "amlogic,meson6-dwmac", "snps,dwmac";
@@ -23,3 +37,18 @@ Example:
 		clocks = <&clk81>;
 		clock-names = "stmmaceth";
 	}
+
+Example for GXBB:
+	ethmac: ethernet@c9410000 {
+		compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
+		reg = <0x0 0xc9410000 0x0 0x10000>,
+			<0x0 0xc8834540 0x0 0x8>;
+		interrupts = <0 8 1>;
+		interrupt-names = "macirq";
+		clocks = <&clkc CLKID_ETH>,
+				<&clkc CLKID_FCLK_DIV2>,
+				<&clkc CLKID_MPLL2>;
+		clock-names = "stmmaceth", "clkin0", "clkin1";
+		phy-mode = "rgmii";
+		status = "disabled";
+	};
-- 
2.9.3

[PATCH v4 2/5] clk: gxbb: expose MPLL2 clock for use by DT

[Martin Blumenstingl]

This exposes the MPLL2 clock as this is one of the input clocks of the
ethernet controller's internal mux.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/clk/meson/gxbb.h              | 2 +-
 include/dt-bindings/clock/gxbb-clkc.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/meson/gxbb.h b/drivers/clk/meson/gxbb.h
index 217df51..3606e875 100644
--- a/drivers/clk/meson/gxbb.h
+++ b/drivers/clk/meson/gxbb.h
@@ -183,7 +183,7 @@
 /* CLKID_CLK81 */
 #define CLKID_MPLL0		  13
 #define CLKID_MPLL1		  14
-#define CLKID_MPLL2		  15
+/* CLKID_MPLL2 */
 #define CLKID_DDR		  16
 #define CLKID_DOS		  17
 #define CLKID_ISA		  18
diff --git a/include/dt-bindings/clock/gxbb-clkc.h b/include/dt-bindings/clock/gxbb-clkc.h
index 7d41864..244ea6e 100644
--- a/include/dt-bindings/clock/gxbb-clkc.h
+++ b/include/dt-bindings/clock/gxbb-clkc.h
@@ -8,6 +8,7 @@
 #define CLKID_CPUCLK		1
 #define CLKID_FCLK_DIV2		4
 #define CLKID_CLK81		12
+#define CLKID_MPLL2		15
 #define CLKID_ETH		36
 #define CLKID_SD_EMMC_A		94
 #define CLKID_SD_EMMC_B		95
-- 
2.9.3

[PATCH v4 3/5] stmmac: introduce get_stmmac_bsp_priv() helper

[Martin Blumenstingl]

From: Joachim Eastwood <manabian@gmail.com>

Create a helper to retrive dwmac private data from a dev
pointer. This is useful in PM callbacks and driver remove.

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
index ffeb8d9..64e147f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
@@ -30,4 +30,12 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
 int stmmac_pltfr_remove(struct platform_device *pdev);
 extern const struct dev_pm_ops stmmac_pltfr_pm_ops;
 
+static inline void *get_stmmac_bsp_priv(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+
+	return priv->plat->bsp_priv;
+}
+
 #endif /* __STMMAC_PLATFORM_H__ */
-- 
2.9.3

[PATCH v4 4/5] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Martin Blumenstingl]

The Ethernet controller available in Meson8b and GXBB SoCs is a Synopsys
DesignWare MAC IP core which is already supported by the stmmac driver.

In addition to the standard stmmac driver some Meson8b / GXBB specific
registers have to be configured for the PHY clocks. These SoC specific
registers are called PRG_ETHERNET_ADDR0 and PRG_ETHERNET_ADDR1 in the
datasheet.
These registers are not backwards compatible with those on Meson 6b,
which is why a new glue driver is introduced. This worked for many
boards because the bootloader programs the PRG_ETHERNET registers
correctly. Additionally the meson6-dwmac driver only sets bit 1 of
PRG_ETHERNET_ADDR0 which (according to the datasheet) is only used
during reset.

Currently all configuration values can be determined automatically,
based on the configured phy-mode (which is mandatory for the stmmac
driver). If required the tx-delay and the mux clock (so it supports
the MPLL2 clock as well) can be made configurable in the future.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
Tested-by: Kevin Hilman <khilman-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
Acked-by: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
---
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    | 324 +++++++++++++++++++++
 2 files changed, 325 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 44b630c..f77edb9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -9,7 +9,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
 obj-$(CONFIG_STMMAC_PLATFORM)	+= stmmac-platform.o
 obj-$(CONFIG_DWMAC_IPQ806X)	+= dwmac-ipq806x.o
 obj-$(CONFIG_DWMAC_LPC18XX)	+= dwmac-lpc18xx.o
-obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o
+obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o dwmac-meson8b.o
 obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rk.o
 obj-$(CONFIG_DWMAC_SOCFPGA)	+= dwmac-altr-socfpga.o
 obj-$(CONFIG_DWMAC_STI)		+= dwmac-sti.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
new file mode 100644
index 0000000..a31ec24
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -0,0 +1,324 @@
+/*
+ * Amlogic Meson S805/S905 DWMAC glue layer
+ *
+ * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/ethtool.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/of_net.h>
+#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/stmmac.h>
+
+#include "stmmac_platform.h"
+
+#define PRG_ETH0			0x0
+
+#define PRG_ETH0_RGMII_MODE		BIT(0)
+
+/* mux to choose between fclk_div2 (bit unset) and mpll2 (bit set) */
+#define PRG_ETH0_CLK_M250_SEL_SHIFT	4
+#define PRG_ETH0_CLK_M250_SEL_MASK	GENMASK(4, 4)
+
+#define PRG_ETH0_TXDLY_SHIFT		5
+#define PRG_ETH0_TXDLY_MASK		GENMASK(6, 5)
+#define PRG_ETH0_TXDLY_OFF		(0x0 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_QUARTER		(0x1 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_HALF		(0x2 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_THREE_QUARTERS	(0x3 << PRG_ETH0_TXDLY_SHIFT)
+
+/* divider for the result of m250_sel */
+#define PRG_ETH0_CLK_M250_DIV_SHIFT	7
+#define PRG_ETH0_CLK_M250_DIV_WIDTH	3
+
+/* divides the result of m25_sel by either 5 (bit unset) or 10 (bit set) */
+#define PRG_ETH0_CLK_M25_DIV_SHIFT	10
+#define PRG_ETH0_CLK_M25_DIV_WIDTH	1
+
+#define PRG_ETH0_INVERTED_RMII_CLK	BIT(11)
+#define PRG_ETH0_TX_AND_PHY_REF_CLK	BIT(12)
+
+#define MUX_CLK_NUM_PARENTS		2
+
+struct meson8b_dwmac {
+	struct platform_device	*pdev;
+
+	void __iomem		*regs;
+
+	phy_interface_t		phy_mode;
+
+	struct clk_mux		m250_mux;
+	struct clk		*m250_mux_clk;
+	struct clk		*m250_mux_parent[MUX_CLK_NUM_PARENTS];
+
+	struct clk_divider	m250_div;
+	struct clk		*m250_div_clk;
+
+	struct clk_divider	m25_div;
+	struct clk		*m25_div_clk;
+};
+
+static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
+				    u32 mask, u32 value)
+{
+	u32 data;
+
+	data = readl(dwmac->regs + reg);
+	data &= ~mask;
+	data |= (value & mask);
+
+	writel(data, dwmac->regs + reg);
+}
+
+static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
+{
+	struct clk_init_data init;
+	int i, ret;
+	struct device *dev = &dwmac->pdev->dev;
+	char clk_name[32];
+	const char *clk_div_parents[1];
+	const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
+	static struct clk_div_table clk_25m_div_table[] = {
+		{ .val = 0, .div = 5 },
+		{ .val = 1, .div = 10 },
+		{ /* sentinel */ },
+	};
+
+	/* get the mux parents from DT */
+	for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
+		char name[16];
+
+		snprintf(name, sizeof(name), "clkin%d", i);
+		dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
+		if (IS_ERR(dwmac->m250_mux_parent[i])) {
+			ret = PTR_ERR(dwmac->m250_mux_parent[i]);
+			if (ret != -EPROBE_DEFER)
+				dev_err(dev, "Missing clock %s\n", name);
+			return ret;
+		}
+
+		mux_parent_names[i] =
+			__clk_get_name(dwmac->m250_mux_parent[i]);
+	}
+
+	/* create the m250_mux */
+	snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
+	init.name = clk_name;
+	init.ops = &clk_mux_ops;
+	init.flags = 0;
+	init.parent_names = mux_parent_names;
+	init.num_parents = MUX_CLK_NUM_PARENTS;
+
+	dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
+	dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
+	dwmac->m250_mux.flags = 0;
+	dwmac->m250_mux.table = NULL;
+	dwmac->m250_mux.hw.init = &init;
+
+	dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
+	if (WARN_ON(IS_ERR(dwmac->m250_mux_clk)))
+		return PTR_ERR(dwmac->m250_mux_clk);
+
+	/* create the m250_div */
+	snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
+	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
+	init.ops = &clk_divider_ops;
+	init.flags = CLK_SET_RATE_PARENT;
+	clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
+	init.parent_names = clk_div_parents;
+	init.num_parents = ARRAY_SIZE(clk_div_parents);
+
+	dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
+	dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
+	dwmac->m250_div.hw.init = &init;
+	dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
+
+	dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);
+	if (WARN_ON(IS_ERR(dwmac->m250_div_clk)))
+		return PTR_ERR(dwmac->m250_div_clk);
+
+	/* create the m25_div */
+	snprintf(clk_name, sizeof(clk_name), "%s#m25_div", dev_name(dev));
+	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
+	init.ops = &clk_divider_ops;
+	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
+	clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
+	init.parent_names = clk_div_parents;
+	init.num_parents = ARRAY_SIZE(clk_div_parents);
+
+	dwmac->m25_div.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m25_div.shift = PRG_ETH0_CLK_M25_DIV_SHIFT;
+	dwmac->m25_div.width = PRG_ETH0_CLK_M25_DIV_WIDTH;
+	dwmac->m25_div.table = clk_25m_div_table;
+	dwmac->m25_div.hw.init = &init;
+	dwmac->m25_div.flags = CLK_DIVIDER_ALLOW_ZERO;
+
+	dwmac->m25_div_clk = devm_clk_register(dev, &dwmac->m25_div.hw);
+	if (WARN_ON(IS_ERR(dwmac->m25_div_clk)))
+		return PTR_ERR(dwmac->m25_div_clk);
+
+	return 0;
+}
+
+static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
+{
+	int ret;
+	unsigned long clk_rate;
+
+	switch (dwmac->phy_mode) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		/* Generate a 25MHz clock for the PHY */
+		clk_rate = 25 * 1000 * 1000;
+
+		/* enable RGMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
+					PRG_ETH0_RGMII_MODE);
+
+		/* only relevant for RMII mode -> disable in RGMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
+					PRG_ETH0_INVERTED_RMII_CLK, 0);
+
+		/* TX clock delay - all known boards use a 1/4 cycle delay */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
+					PRG_ETH0_TXDLY_QUARTER);
+		break;
+
+	case PHY_INTERFACE_MODE_RMII:
+		/* Use the rate of the mux clock for the internal RMII PHY */
+		clk_rate = clk_get_rate(dwmac->m250_mux_clk);
+
+		/* disable RGMII mode -> enables RMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
+					0);
+
+		/* invert internal clk_rmii_i to generate 25/2.5 tx_rx_clk */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
+					PRG_ETH0_INVERTED_RMII_CLK,
+					PRG_ETH0_INVERTED_RMII_CLK);
+
+		/* TX clock delay cannot be configured in RMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
+					0);
+
+		break;
+
+	default:
+		dev_err(&dwmac->pdev->dev, "unsupported phy-mode %s\n",
+			phy_modes(dwmac->phy_mode));
+		return -EINVAL;
+	}
+
+	ret = clk_prepare_enable(dwmac->m25_div_clk);
+	if (ret) {
+		dev_err(&dwmac->pdev->dev, "failed to enable the PHY clock\n");
+		return ret;
+	}
+
+	ret = clk_set_rate(dwmac->m25_div_clk, clk_rate);
+	if (ret) {
+		clk_disable_unprepare(dwmac->m25_div_clk);
+
+		dev_err(&dwmac->pdev->dev, "failed to set PHY clock\n");
+		return ret;
+	}
+
+	/* enable TX_CLK and PHY_REF_CLK generator */
+	meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
+				PRG_ETH0_TX_AND_PHY_REF_CLK);
+
+	return 0;
+}
+
+static int meson8b_dwmac_probe(struct platform_device *pdev)
+{
+	struct plat_stmmacenet_data *plat_dat;
+	struct stmmac_resources stmmac_res;
+	struct resource *res;
+	struct meson8b_dwmac *dwmac;
+	int ret;
+
+	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+	if (ret)
+		return ret;
+
+	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+	if (IS_ERR(plat_dat))
+		return PTR_ERR(plat_dat);
+
+	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+	if (!dwmac)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	dwmac->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(dwmac->regs))
+		return PTR_ERR(dwmac->regs);
+
+	dwmac->pdev = pdev;
+	dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
+	if (dwmac->phy_mode < 0) {
+		dev_err(&pdev->dev, "missing phy-mode property\n");
+		return -EINVAL;
+	}
+
+	ret = meson8b_init_clk(dwmac);
+	if (ret)
+		return ret;
+
+	ret = meson8b_init_prg_eth(dwmac);
+	if (ret)
+		return ret;
+
+	plat_dat->bsp_priv = dwmac;
+
+	return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+}
+
+static int meson8b_dwmac_remove(struct platform_device *pdev)
+{
+	struct meson8b_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
+
+	clk_disable_unprepare(dwmac->m25_div_clk);
+
+	return stmmac_pltfr_remove(pdev);
+}
+
+static const struct of_device_id meson8b_dwmac_match[] = {
+	{ .compatible = "amlogic,meson8b-dwmac" },
+	{ .compatible = "amlogic,meson-gxbb-dwmac" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, meson8b_dwmac_match);
+
+static struct platform_driver meson8b_dwmac_driver = {
+	.probe  = meson8b_dwmac_probe,
+	.remove = meson8b_dwmac_remove,
+	.driver = {
+		.name           = "meson8b-dwmac",
+		.pm		= &stmmac_pltfr_pm_ops,
+		.of_match_table = meson8b_dwmac_match,
+	},
+};
+module_platform_driver(meson8b_dwmac_driver);
+
+MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>");
+MODULE_DESCRIPTION("Amlogic Meson S805/S905 DWMAC glue layer");
+MODULE_LICENSE("GPL v2");
-- 
2.9.3

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[PATCH v4 5/5] ARM64: dts: meson-gxbb: use the new GXBB DWMAC glue driver

[Martin Blumenstingl]

The Amlogic reference driver uses the "mc_val" devicetree property to
configure the PRG_ETHERNET_ADDR0 register. Unfortunately it uses magic
values for this configuration.
According to the datasheet the PRG_ETHERNET_ADDR0 register is at address
0xc8834108. However, the reference driver uses 0xc8834540 instead.
According to my tests, the value from the reference driver is correct.

No changes are required to the board dts files because the only
required configuration option is the phy-mode, which had to be
configured correctly before as well.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index 2b47415..2e8a3d9 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
@@ -497,13 +497,15 @@
 		};
 
 		ethmac: ethernet@c9410000 {
-			compatible = "amlogic,meson6-dwmac", "snps,dwmac";
+			compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
 			reg = <0x0 0xc9410000 0x0 0x10000
 			       0x0 0xc8834540 0x0 0x4>;
 			interrupts = <0 8 1>;
 			interrupt-names = "macirq";
-			clocks = <&clkc CLKID_ETH>;
-			clock-names = "stmmaceth";
+			clocks = <&clkc CLKID_ETH>,
+				 <&clkc CLKID_FCLK_DIV2>,
+				 <&clkc CLKID_MPLL2>;
+			clock-names = "stmmaceth", "clkin0", "clkin1";
 			phy-mode = "rgmii";
 			status = "disabled";
 		};
-- 
2.9.3

Re: [PATCH v4 4/5] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 10245 bytes --]

Hi Martin,

[auto build test ERROR on next-20160825]
[also build test ERROR on v4.8-rc5]
[cannot apply to robh/for-next net-next/master net/master v4.8-rc4 v4.8-rc3 v4.8-rc2]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    https://github.com/0day-ci/linux/commits/Martin-Blumenstingl/meson-Meson8b-and-GXBB-DWMAC-glue-driver/20160905-023130
config: sparc64-allyesconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 5.4.0-6) 5.4.0 20160609
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All error/warnings (new ones prefixed by >>):

>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:63:18: error: field 'm250_mux' has incomplete type
     struct clk_mux  m250_mux;
                     ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:67:21: error: field 'm250_div' has incomplete type
     struct clk_divider m250_div;
                        ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:70:21: error: field 'm25_div' has incomplete type
     struct clk_divider m25_div;
                        ^
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c: In function 'meson8b_init_clk':
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:88:23: error: storage size of 'init' isn't known
     struct clk_init_data init;
                          ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:94:30: error: array type has incomplete element type 'struct clk_div_table'
     static struct clk_div_table clk_25m_div_table[] = {
                                 ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:95:5: error: field name not in record or union initializer
      { .val = 0, .div = 5 },
        ^
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:95:5: note: (near initialization for 'clk_25m_div_table')
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:95:15: error: field name not in record or union initializer
      { .val = 0, .div = 5 },
                  ^
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:95:15: note: (near initialization for 'clk_25m_div_table')
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:96:5: error: field name not in record or union initializer
      { .val = 1, .div = 10 },
        ^
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:96:5: note: (near initialization for 'clk_25m_div_table')
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:96:15: error: field name not in record or union initializer
      { .val = 1, .div = 10 },
                  ^
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:96:15: note: (near initialization for 'clk_25m_div_table')
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:114:4: error: implicit declaration of function '__clk_get_name' [-Werror=implicit-function-declaration]
       __clk_get_name(dwmac->m250_mux_parent[i]);
       ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:113:23: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
      mux_parent_names[i] =
                          ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:120:14: error: 'clk_mux_ops' undeclared (first use in this function)
     init.ops = &clk_mux_ops;
                 ^
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:120:14: note: each undeclared identifier is reported only once for each function it appears in
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:132:24: error: implicit declaration of function 'devm_clk_register' [-Werror=implicit-function-declaration]
     dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
                           ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:139:14: error: 'clk_divider_ops' undeclared (first use in this function)
     init.ops = &clk_divider_ops;
                 ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:140:15: error: 'CLK_SET_RATE_PARENT' undeclared (first use in this function)
     init.flags = CLK_SET_RATE_PARENT;
                  ^
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:141:21: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
                        ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:149:26: error: 'CLK_DIVIDER_ONE_BASED' undeclared (first use in this function)
     dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
                             ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:149:50: error: 'CLK_DIVIDER_ALLOW_ZERO' undeclared (first use in this function)
     dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
                                                     ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:159:15: error: 'CLK_IS_BASIC' undeclared (first use in this function)
     init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
                  ^
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:160:21: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
                        ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:94:30: warning: unused variable 'clk_25m_div_table' [-Wunused-variable]
     static struct clk_div_table clk_25m_div_table[] = {
                                 ^
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:88:23: warning: unused variable 'init' [-Wunused-variable]
     struct clk_init_data init;
                          ^
   cc1: some warnings being treated as errors

vim +/m250_mux +63 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

    57		struct platform_device	*pdev;
    58	
    59		void __iomem		*regs;
    60	
    61		phy_interface_t		phy_mode;
    62	
  > 63		struct clk_mux		m250_mux;
    64		struct clk		*m250_mux_clk;
    65		struct clk		*m250_mux_parent[MUX_CLK_NUM_PARENTS];
    66	
  > 67		struct clk_divider	m250_div;
    68		struct clk		*m250_div_clk;
    69	
  > 70		struct clk_divider	m25_div;
    71		struct clk		*m25_div_clk;
    72	};
    73	
    74	static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
    75					    u32 mask, u32 value)
    76	{
    77		u32 data;
    78	
    79		data = readl(dwmac->regs + reg);
    80		data &= ~mask;
    81		data |= (value & mask);
    82	
    83		writel(data, dwmac->regs + reg);
    84	}
    85	
    86	static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
    87	{
  > 88		struct clk_init_data init;
    89		int i, ret;
    90		struct device *dev = &dwmac->pdev->dev;
    91		char clk_name[32];
    92		const char *clk_div_parents[1];
    93		const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
  > 94		static struct clk_div_table clk_25m_div_table[] = {
  > 95			{ .val = 0, .div = 5 },
  > 96			{ .val = 1, .div = 10 },
    97			{ /* sentinel */ },
    98		};
    99	
   100		/* get the mux parents from DT */
   101		for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
   102			char name[16];
   103	
   104			snprintf(name, sizeof(name), "clkin%d", i);
   105			dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
   106			if (IS_ERR(dwmac->m250_mux_parent[i])) {
   107				ret = PTR_ERR(dwmac->m250_mux_parent[i]);
   108				if (ret != -EPROBE_DEFER)
   109					dev_err(dev, "Missing clock %s\n", name);
   110				return ret;
   111			}
   112	
 > 113			mux_parent_names[i] =
 > 114				__clk_get_name(dwmac->m250_mux_parent[i]);
   115		}
   116	
   117		/* create the m250_mux */
   118		snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
   119		init.name = clk_name;
 > 120		init.ops = &clk_mux_ops;
   121		init.flags = 0;
   122		init.parent_names = mux_parent_names;
   123		init.num_parents = MUX_CLK_NUM_PARENTS;
   124	
   125		dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
   126		dwmac->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
   127		dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
   128		dwmac->m250_mux.flags = 0;
   129		dwmac->m250_mux.table = NULL;
   130		dwmac->m250_mux.hw.init = &init;
   131	
 > 132		dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
   133		if (WARN_ON(IS_ERR(dwmac->m250_mux_clk)))
   134			return PTR_ERR(dwmac->m250_mux_clk);
   135	
   136		/* create the m250_div */
   137		snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
   138		init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
 > 139		init.ops = &clk_divider_ops;
 > 140		init.flags = CLK_SET_RATE_PARENT;
 > 141		clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
   142		init.parent_names = clk_div_parents;
   143		init.num_parents = ARRAY_SIZE(clk_div_parents);
   144	
   145		dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
   146		dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
   147		dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
   148		dwmac->m250_div.hw.init = &init;
 > 149		dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
   150	
   151		dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);
   152		if (WARN_ON(IS_ERR(dwmac->m250_div_clk)))
   153			return PTR_ERR(dwmac->m250_div_clk);
   154	
   155		/* create the m25_div */
   156		snprintf(clk_name, sizeof(clk_name), "%s#m25_div", dev_name(dev));
   157		init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
   158		init.ops = &clk_divider_ops;
 > 159		init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
   160		clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
   161		init.parent_names = clk_div_parents;
   162		init.num_parents = ARRAY_SIZE(clk_div_parents);

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/octet-stream, Size: 47275 bytes --]

Re: [PATCH v4 4/5] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 5822 bytes --]

Hi Martin,

[auto build test ERROR on next-20160825]
[also build test ERROR on v4.8-rc5]
[cannot apply to robh/for-next net-next/master net/master v4.8-rc4 v4.8-rc3 v4.8-rc2]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    https://github.com/0day-ci/linux/commits/Martin-Blumenstingl/meson-Meson8b-and-GXBB-DWMAC-glue-driver/20160905-023130
config: tile-allyesconfig (attached as .config)
compiler: tilegx-linux-gcc (GCC) 4.6.2
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=tile 

All errors (new ones prefixed by >>):

   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:63:18: error: field 'm250_mux' has incomplete type
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:67:21: error: field 'm250_div' has incomplete type
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:70:21: error: field 'm25_div' has incomplete type
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c: In function 'meson8b_init_clk':
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:88:23: error: storage size of 'init' isn't known
>> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:94:30: error: array type has incomplete element type
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:95:3: error: field name not in record or union initializer
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:95:3: error: (near initialization for 'clk_25m_div_table')
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:95:3: error: field name not in record or union initializer
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:95:3: error: (near initialization for 'clk_25m_div_table')
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:96:3: error: field name not in record or union initializer
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:96:3: error: (near initialization for 'clk_25m_div_table')
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:96:3: error: field name not in record or union initializer
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:96:3: error: (near initialization for 'clk_25m_div_table')
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:114:4: error: implicit declaration of function '__clk_get_name'
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:113:23: warning: assignment makes pointer from integer without a cast [enabled by default]
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:120:14: error: 'clk_mux_ops' undeclared (first use in this function)
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:120:14: note: each undeclared identifier is reported only once for each function it appears in
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:132:2: error: implicit declaration of function 'devm_clk_register'
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:139:14: error: 'clk_divider_ops' undeclared (first use in this function)
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:140:15: error: 'CLK_SET_RATE_PARENT' undeclared (first use in this function)
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:141:21: warning: assignment makes pointer from integer without a cast [enabled by default]
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:149:26: error: 'CLK_DIVIDER_ONE_BASED' undeclared (first use in this function)
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:149:50: error: 'CLK_DIVIDER_ALLOW_ZERO' undeclared (first use in this function)
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:159:15: error: 'CLK_IS_BASIC' undeclared (first use in this function)
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:160:21: warning: assignment makes pointer from integer without a cast [enabled by default]
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:94:30: warning: unused variable 'clk_25m_div_table'
   drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:88:23: warning: unused variable 'init'
   cc1: some warnings being treated as errors

vim +94 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

    57		struct platform_device	*pdev;
    58	
    59		void __iomem		*regs;
    60	
    61		phy_interface_t		phy_mode;
    62	
  > 63		struct clk_mux		m250_mux;
    64		struct clk		*m250_mux_clk;
    65		struct clk		*m250_mux_parent[MUX_CLK_NUM_PARENTS];
    66	
    67		struct clk_divider	m250_div;
    68		struct clk		*m250_div_clk;
    69	
    70		struct clk_divider	m25_div;
    71		struct clk		*m25_div_clk;
    72	};
    73	
    74	static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
    75					    u32 mask, u32 value)
    76	{
    77		u32 data;
    78	
    79		data = readl(dwmac->regs + reg);
    80		data &= ~mask;
    81		data |= (value & mask);
    82	
    83		writel(data, dwmac->regs + reg);
    84	}
    85	
    86	static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
    87	{
    88		struct clk_init_data init;
    89		int i, ret;
    90		struct device *dev = &dwmac->pdev->dev;
    91		char clk_name[32];
    92		const char *clk_div_parents[1];
    93		const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
  > 94		static struct clk_div_table clk_25m_div_table[] = {
    95			{ .val = 0, .div = 5 },
    96			{ .val = 1, .div = 10 },
    97			{ /* sentinel */ },

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/octet-stream, Size: 45742 bytes --]

Re: [PATCH v3 4/5] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Arnd Bergmann]

On Sunday, September 4, 2016 8:20:15 PM CEST Martin Blumenstingl wrote:
> 
> >> +     dwmac->m25_div_clk = devm_clk_register(dev, &dwmac->m25_div.hw);
> >> +     if (WARN_ON(PTR_ERR_OR_ZERO(dwmac->m25_div_clk)))
> >> +             return PTR_ERR(dwmac->m25_div_clk);
> >> +
> >> +     return 0;
> >
> > This could be return WARN_ON(PTR_ERR_OR_ZERO(...))
> This would work as well but I prefer the way it is right now (as one
> could easily extend the code without having to touch any existing code
> apart from the last return).
> However, as it's always the case with personal preference: if
> coding-style requires me to change it then I'll do so, just let me
> know.
> 
> I have addressed all other issues you found (thanks for that!) in v4
> (which I am about to send in the next few minutes).


Both of these are fairly unusual. The most common way to write it is

	if (WARN_ON(IS_ERR(dwmac->m25_div_clk)))
		return PTR_ERR(dwmac->m25_div_clk);
   return 0;

However, I now tend to prefer

	ret = PTR_ERR_OR_ZERO(dwmac->m25_div_clk);
	WARN_ON(ret);
	return ret;

which is less likely to cause false-positive warnings when building
with -Wmaybe-uninitialized than any of the other ones.

Please don't use PTR_ERR_OR_ZERO() as a condition, that is what
IS_ERR() is meant for.

	Arnd
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Re: [PATCH v4 4/5] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Arnd Bergmann]

On Monday, September 5, 2016 9:37:29 AM CEST kbuild test robot wrote:
> All error/warnings (new ones prefixed by >>):
> 
> >> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:63:18: error: field 'm250_mux' has incomplete type
>      struct clk_mux  m250_mux;
>                      ^
> >> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:67:21: error: field 'm250_div' has incomplete type
>      struct clk_divider m250_div;
>                         ^
> 

I think this needs a compile-time dependency on COMMON_CLK

	Arnd

Re: [PATCH v4 4/5] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Martin Blumenstingl]

On Mon, Sep 5, 2016 at 12:53 PM, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org> wrote:
> On Monday, September 5, 2016 9:37:29 AM CEST kbuild test robot wrote:
>> All error/warnings (new ones prefixed by >>):
>>
>> >> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:63:18: error: field 'm250_mux' has incomplete type
>>      struct clk_mux  m250_mux;
>>                      ^
>> >> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:67:21: error: field 'm250_div' has incomplete type
>>      struct clk_divider m250_div;
>>                         ^
>>
>
> I think this needs a compile-time dependency on COMMON_CLK
indeed, since we are also a clock provider we have to depend on
CONFIG_COMMON_CLK.

That brings up a question though:
so far the new driver uses the same Kconfig symbol as the "old" driver
(CONFIG_DWMAC_MESON).
The "old" driver does not need CONFIG_COMMON_CLK while the new one does.
I see a few options here:
1. simply adding the dependency (as most configurations will have
CONFIG_COMMON_CLK enabled anyways)
2. add some depends on COMMON_CLK || MACH_MESON6 || MACH_MESON8 foo
3. use a new Kconfig symbol for new new driver (CONFIG_DWMAC_MESON8B?)

And finally regarding your other mail: I have already changed
WARN_ON(PTR_ERR_OR_ZERO(...)) to WARN_ON(IS_ERR(...)) in v4


Regards,
Martin
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Re: [PATCH v4 4/5] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Arnd Bergmann]

On Monday, September 5, 2016 9:07:03 PM CEST Martin Blumenstingl wrote:
> On Mon, Sep 5, 2016 at 12:53 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> > On Monday, September 5, 2016 9:37:29 AM CEST kbuild test robot wrote:
> >> All error/warnings (new ones prefixed by >>):
> >>
> >> >> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:63:18: error: field 'm250_mux' has incomplete type
> >>      struct clk_mux  m250_mux;
> >>                      ^
> >> >> drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c:67:21: error: field 'm250_div' has incomplete type
> >>      struct clk_divider m250_div;
> >>                         ^
> >>
> >
> > I think this needs a compile-time dependency on COMMON_CLK
> indeed, since we are also a clock provider we have to depend on
> CONFIG_COMMON_CLK.
> 
> That brings up a question though:
> so far the new driver uses the same Kconfig symbol as the "old" driver
> (CONFIG_DWMAC_MESON).
> The "old" driver does not need CONFIG_COMMON_CLK while the new one does.
> I see a few options here:
> 1. simply adding the dependency (as most configurations will have
> CONFIG_COMMON_CLK enabled anyways)

I think that's fine. At least on both ARM multiplatform and ARM64 it is
always defined by definition, and when build testing, it should be possible
to enable it on other architectures as well.

> 2. add some depends on COMMON_CLK || MACH_MESON6 || MACH_MESON8 foo

That doesn't work unless you also put the calls into the clk interface
inside of ugly #ifdef

> 3. use a new Kconfig symbol for new new driver (CONFIG_DWMAC_MESON8B?)

That would be ok as well, probably not necessary.

> And finally regarding your other mail: I have already changed
> WARN_ON(PTR_ERR_OR_ZERO(...)) to WARN_ON(IS_ERR(...)) in v4

Ok, thanks.

	Arnd

[PATCH v5 0/6] meson: Meson8b and GXBB DWMAC glue driver

[Martin Blumenstingl]

This adds a DWMAC glue driver for the PRG_ETHERNET registers found in
Meson8b and GXBB SoCs. Based on the "old" meson6b-dwmac glue driver
the register layout is completely different.
Thus I introduced a separate driver.


Changes since v4:
- DWMAC_MESON now depends on COMMON_CLK because the new glue driver is
  also a clock provider (which requires COMMON_CLK)
- use Meson8b and GXBB in the module description (instead of the
  marketing names S805 and S905)
- fixed a trivial typo (retrive -> retrieve) in the
  get_stmmac_bsp_priv() helper patch
- added a new patch to update the module description of the dwmac-meson
  driver to indicate which SoCs are supported exactly (this patch is
  optional and does not affect the rest of the series)


Joachim Eastwood (1):
  stmmac: introduce get_stmmac_bsp_priv() helper

Martin Blumenstingl (5):
  net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings
  clk: gxbb: expose MPLL2 clock for use by DT
  net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC
  ARM64: dts: meson-gxbb: use the new GXBB DWMAC glue driver
  net: stmmac: update the module description of the dwmac-meson driver

 .../devicetree/bindings/net/meson-dwmac.txt        |  45 ++-
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   8 +-
 drivers/clk/meson/gxbb.h                           |   2 +-
 drivers/net/ethernet/stmicro/stmmac/Kconfig        |   6 +-
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c  |   4 +-
 .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    | 324 +++++++++++++++++++++
 .../net/ethernet/stmicro/stmmac/stmmac_platform.h  |   8 +
 include/dt-bindings/clock/gxbb-clkc.h              |   1 +
 9 files changed, 382 insertions(+), 18 deletions(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

-- 
2.9.3

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[PATCH v5 1/6] net: dt-bindings: Document the new Meson8b and GXBB DWMAC bindings

[Martin Blumenstingl]

This patch adds the documentation for the DWMAC ethernet controller
found in Amlogic Meson 8b (S805) and GXBB (S905) SoCs.
The main difference between the Meson6 glue is that different registers
(with different layout) are used.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
---
 .../devicetree/bindings/net/meson-dwmac.txt        | 45 ++++++++++++++++++----
 1 file changed, 37 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/meson-dwmac.txt b/Documentation/devicetree/bindings/net/meson-dwmac.txt
index ec633d7..89e62dd 100644
--- a/Documentation/devicetree/bindings/net/meson-dwmac.txt
+++ b/Documentation/devicetree/bindings/net/meson-dwmac.txt
@@ -1,18 +1,32 @@
 * Amlogic Meson DWMAC Ethernet controller
 
 The device inherits all the properties of the dwmac/stmmac devices
-described in the file net/stmmac.txt with the following changes.
+described in the file stmmac.txt in the current directory with the
+following changes.
 
-Required properties:
+Required properties on all platforms:
 
-- compatible: should be "amlogic,meson6-dwmac" along with "snps,dwmac"
-	      and any applicable more detailed version number
-	      described in net/stmmac.txt
+- compatible:	Depending on the platform this should be one of:
+			- "amlogic,meson6-dwmac"
+			- "amlogic,meson8b-dwmac"
+			- "amlogic,meson-gxbb-dwmac"
+		Additionally "snps,dwmac" and any applicable more
+		detailed version number described in net/stmmac.txt
+		should be used.
 
-- reg: should contain a register range for the dwmac controller and
-       another one for the Amlogic specific configuration
+- reg:	The first register range should be the one of the DWMAC
+	controller. The second range is is for the Amlogic specific
+	configuration (for example the PRG_ETHERNET register range
+	on Meson8b and newer)
 
-Example:
+Required properties on Meson8b and newer:
+- clock-names:	Should contain the following:
+		- "stmmaceth" - see stmmac.txt
+		- "clkin0" - first parent clock of the internal mux
+		- "clkin1" - second parent clock of the internal mux
+
+
+Example for Meson6:
 
 	ethmac: ethernet@c9410000 {
 		compatible = "amlogic,meson6-dwmac", "snps,dwmac";
@@ -23,3 +37,18 @@ Example:
 		clocks = <&clk81>;
 		clock-names = "stmmaceth";
 	}
+
+Example for GXBB:
+	ethmac: ethernet@c9410000 {
+		compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
+		reg = <0x0 0xc9410000 0x0 0x10000>,
+			<0x0 0xc8834540 0x0 0x8>;
+		interrupts = <0 8 1>;
+		interrupt-names = "macirq";
+		clocks = <&clkc CLKID_ETH>,
+				<&clkc CLKID_FCLK_DIV2>,
+				<&clkc CLKID_MPLL2>;
+		clock-names = "stmmaceth", "clkin0", "clkin1";
+		phy-mode = "rgmii";
+		status = "disabled";
+	};
-- 
2.9.3

[PATCH v5 2/6] clk: gxbb: expose MPLL2 clock for use by DT

[Martin Blumenstingl]

This exposes the MPLL2 clock as this is one of the input clocks of the
ethernet controller's internal mux.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
---
 drivers/clk/meson/gxbb.h              | 2 +-
 include/dt-bindings/clock/gxbb-clkc.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/meson/gxbb.h b/drivers/clk/meson/gxbb.h
index 217df51..3606e875 100644
--- a/drivers/clk/meson/gxbb.h
+++ b/drivers/clk/meson/gxbb.h
@@ -183,7 +183,7 @@
 /* CLKID_CLK81 */
 #define CLKID_MPLL0		  13
 #define CLKID_MPLL1		  14
-#define CLKID_MPLL2		  15
+/* CLKID_MPLL2 */
 #define CLKID_DDR		  16
 #define CLKID_DOS		  17
 #define CLKID_ISA		  18
diff --git a/include/dt-bindings/clock/gxbb-clkc.h b/include/dt-bindings/clock/gxbb-clkc.h
index 7d41864..244ea6e 100644
--- a/include/dt-bindings/clock/gxbb-clkc.h
+++ b/include/dt-bindings/clock/gxbb-clkc.h
@@ -8,6 +8,7 @@
 #define CLKID_CPUCLK		1
 #define CLKID_FCLK_DIV2		4
 #define CLKID_CLK81		12
+#define CLKID_MPLL2		15
 #define CLKID_ETH		36
 #define CLKID_SD_EMMC_A		94
 #define CLKID_SD_EMMC_B		95
-- 
2.9.3

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[PATCH v5 3/6] stmmac: introduce get_stmmac_bsp_priv() helper

[Martin Blumenstingl]

From: Joachim Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Create a helper to retrieve dwmac private data from a dev
pointer. This is useful in PM callbacks and driver remove.

Signed-off-by: Joachim Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Tested-by: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
Acked-by: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
index ffeb8d9..64e147f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
@@ -30,4 +30,12 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
 int stmmac_pltfr_remove(struct platform_device *pdev);
 extern const struct dev_pm_ops stmmac_pltfr_pm_ops;
 
+static inline void *get_stmmac_bsp_priv(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+
+	return priv->plat->bsp_priv;
+}
+
 #endif /* __STMMAC_PLATFORM_H__ */
-- 
2.9.3

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[PATCH v5 4/6] net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC

[Martin Blumenstingl]

The Ethernet controller available in Meson8b and GXBB SoCs is a Synopsys
DesignWare MAC IP core which is already supported by the stmmac driver.

In addition to the standard stmmac driver some Meson8b / GXBB specific
registers have to be configured for the PHY clocks. These SoC specific
registers are called PRG_ETHERNET_ADDR0 and PRG_ETHERNET_ADDR1 in the
datasheet.
These registers are not backwards compatible with those on Meson 6b,
which is why a new glue driver is introduced. This worked for many
boards because the bootloader programs the PRG_ETHERNET registers
correctly. Additionally the meson6-dwmac driver only sets bit 1 of
PRG_ETHERNET_ADDR0 which (according to the datasheet) is only used
during reset.

Currently all configuration values can be determined automatically,
based on the configured phy-mode (which is mandatory for the stmmac
driver). If required the tx-delay and the mux clock (so it supports
the MPLL2 clock as well) can be made configurable in the future.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
Tested-by: Kevin Hilman <khilman-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
Acked-by: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
---
 drivers/net/ethernet/stmicro/stmmac/Kconfig        |   6 +-
 drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    | 324 +++++++++++++++++++++
 3 files changed, 328 insertions(+), 4 deletions(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 8f06a66..54de175 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -61,13 +61,13 @@ config DWMAC_LPC18XX
 config DWMAC_MESON
 	tristate "Amlogic Meson dwmac support"
 	default ARCH_MESON
-	depends on OF && (ARCH_MESON || COMPILE_TEST)
+	depends on OF && COMMON_CLK && (ARCH_MESON || COMPILE_TEST)
 	help
 	  Support for Ethernet controller on Amlogic Meson SoCs.
 
 	  This selects the Amlogic Meson SoC glue layer support for
-	  the stmmac device driver. This driver is used for Meson6 and
-	  Meson8 SoCs.
+	  the stmmac device driver. This driver is used for Meson6,
+	  Meson8, Meson8b and GXBB SoCs.
 
 config DWMAC_ROCKCHIP
 	tristate "Rockchip dwmac support"
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 44b630c..f77edb9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -9,7 +9,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
 obj-$(CONFIG_STMMAC_PLATFORM)	+= stmmac-platform.o
 obj-$(CONFIG_DWMAC_IPQ806X)	+= dwmac-ipq806x.o
 obj-$(CONFIG_DWMAC_LPC18XX)	+= dwmac-lpc18xx.o
-obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o
+obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o dwmac-meson8b.o
 obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rk.o
 obj-$(CONFIG_DWMAC_SOCFPGA)	+= dwmac-altr-socfpga.o
 obj-$(CONFIG_DWMAC_STI)		+= dwmac-sti.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
new file mode 100644
index 0000000..250e4ce
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -0,0 +1,324 @@
+/*
+ * Amlogic Meson8b and GXBB DWMAC glue layer
+ *
+ * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/ethtool.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/of_net.h>
+#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/stmmac.h>
+
+#include "stmmac_platform.h"
+
+#define PRG_ETH0			0x0
+
+#define PRG_ETH0_RGMII_MODE		BIT(0)
+
+/* mux to choose between fclk_div2 (bit unset) and mpll2 (bit set) */
+#define PRG_ETH0_CLK_M250_SEL_SHIFT	4
+#define PRG_ETH0_CLK_M250_SEL_MASK	GENMASK(4, 4)
+
+#define PRG_ETH0_TXDLY_SHIFT		5
+#define PRG_ETH0_TXDLY_MASK		GENMASK(6, 5)
+#define PRG_ETH0_TXDLY_OFF		(0x0 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_QUARTER		(0x1 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_HALF		(0x2 << PRG_ETH0_TXDLY_SHIFT)
+#define PRG_ETH0_TXDLY_THREE_QUARTERS	(0x3 << PRG_ETH0_TXDLY_SHIFT)
+
+/* divider for the result of m250_sel */
+#define PRG_ETH0_CLK_M250_DIV_SHIFT	7
+#define PRG_ETH0_CLK_M250_DIV_WIDTH	3
+
+/* divides the result of m25_sel by either 5 (bit unset) or 10 (bit set) */
+#define PRG_ETH0_CLK_M25_DIV_SHIFT	10
+#define PRG_ETH0_CLK_M25_DIV_WIDTH	1
+
+#define PRG_ETH0_INVERTED_RMII_CLK	BIT(11)
+#define PRG_ETH0_TX_AND_PHY_REF_CLK	BIT(12)
+
+#define MUX_CLK_NUM_PARENTS		2
+
+struct meson8b_dwmac {
+	struct platform_device	*pdev;
+
+	void __iomem		*regs;
+
+	phy_interface_t		phy_mode;
+
+	struct clk_mux		m250_mux;
+	struct clk		*m250_mux_clk;
+	struct clk		*m250_mux_parent[MUX_CLK_NUM_PARENTS];
+
+	struct clk_divider	m250_div;
+	struct clk		*m250_div_clk;
+
+	struct clk_divider	m25_div;
+	struct clk		*m25_div_clk;
+};
+
+static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
+				    u32 mask, u32 value)
+{
+	u32 data;
+
+	data = readl(dwmac->regs + reg);
+	data &= ~mask;
+	data |= (value & mask);
+
+	writel(data, dwmac->regs + reg);
+}
+
+static int meson8b_init_clk(struct meson8b_dwmac *dwmac)
+{
+	struct clk_init_data init;
+	int i, ret;
+	struct device *dev = &dwmac->pdev->dev;
+	char clk_name[32];
+	const char *clk_div_parents[1];
+	const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
+	static struct clk_div_table clk_25m_div_table[] = {
+		{ .val = 0, .div = 5 },
+		{ .val = 1, .div = 10 },
+		{ /* sentinel */ },
+	};
+
+	/* get the mux parents from DT */
+	for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
+		char name[16];
+
+		snprintf(name, sizeof(name), "clkin%d", i);
+		dwmac->m250_mux_parent[i] = devm_clk_get(dev, name);
+		if (IS_ERR(dwmac->m250_mux_parent[i])) {
+			ret = PTR_ERR(dwmac->m250_mux_parent[i]);
+			if (ret != -EPROBE_DEFER)
+				dev_err(dev, "Missing clock %s\n", name);
+			return ret;
+		}
+
+		mux_parent_names[i] =
+			__clk_get_name(dwmac->m250_mux_parent[i]);
+	}
+
+	/* create the m250_mux */
+	snprintf(clk_name, sizeof(clk_name), "%s#m250_sel", dev_name(dev));
+	init.name = clk_name;
+	init.ops = &clk_mux_ops;
+	init.flags = 0;
+	init.parent_names = mux_parent_names;
+	init.num_parents = MUX_CLK_NUM_PARENTS;
+
+	dwmac->m250_mux.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
+	dwmac->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
+	dwmac->m250_mux.flags = 0;
+	dwmac->m250_mux.table = NULL;
+	dwmac->m250_mux.hw.init = &init;
+
+	dwmac->m250_mux_clk = devm_clk_register(dev, &dwmac->m250_mux.hw);
+	if (WARN_ON(IS_ERR(dwmac->m250_mux_clk)))
+		return PTR_ERR(dwmac->m250_mux_clk);
+
+	/* create the m250_div */
+	snprintf(clk_name, sizeof(clk_name), "%s#m250_div", dev_name(dev));
+	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
+	init.ops = &clk_divider_ops;
+	init.flags = CLK_SET_RATE_PARENT;
+	clk_div_parents[0] = __clk_get_name(dwmac->m250_mux_clk);
+	init.parent_names = clk_div_parents;
+	init.num_parents = ARRAY_SIZE(clk_div_parents);
+
+	dwmac->m250_div.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
+	dwmac->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
+	dwmac->m250_div.hw.init = &init;
+	dwmac->m250_div.flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
+
+	dwmac->m250_div_clk = devm_clk_register(dev, &dwmac->m250_div.hw);
+	if (WARN_ON(IS_ERR(dwmac->m250_div_clk)))
+		return PTR_ERR(dwmac->m250_div_clk);
+
+	/* create the m25_div */
+	snprintf(clk_name, sizeof(clk_name), "%s#m25_div", dev_name(dev));
+	init.name = devm_kstrdup(dev, clk_name, GFP_KERNEL);
+	init.ops = &clk_divider_ops;
+	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
+	clk_div_parents[0] = __clk_get_name(dwmac->m250_div_clk);
+	init.parent_names = clk_div_parents;
+	init.num_parents = ARRAY_SIZE(clk_div_parents);
+
+	dwmac->m25_div.reg = dwmac->regs + PRG_ETH0;
+	dwmac->m25_div.shift = PRG_ETH0_CLK_M25_DIV_SHIFT;
+	dwmac->m25_div.width = PRG_ETH0_CLK_M25_DIV_WIDTH;
+	dwmac->m25_div.table = clk_25m_div_table;
+	dwmac->m25_div.hw.init = &init;
+	dwmac->m25_div.flags = CLK_DIVIDER_ALLOW_ZERO;
+
+	dwmac->m25_div_clk = devm_clk_register(dev, &dwmac->m25_div.hw);
+	if (WARN_ON(IS_ERR(dwmac->m25_div_clk)))
+		return PTR_ERR(dwmac->m25_div_clk);
+
+	return 0;
+}
+
+static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
+{
+	int ret;
+	unsigned long clk_rate;
+
+	switch (dwmac->phy_mode) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		/* Generate a 25MHz clock for the PHY */
+		clk_rate = 25 * 1000 * 1000;
+
+		/* enable RGMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
+					PRG_ETH0_RGMII_MODE);
+
+		/* only relevant for RMII mode -> disable in RGMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
+					PRG_ETH0_INVERTED_RMII_CLK, 0);
+
+		/* TX clock delay - all known boards use a 1/4 cycle delay */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
+					PRG_ETH0_TXDLY_QUARTER);
+		break;
+
+	case PHY_INTERFACE_MODE_RMII:
+		/* Use the rate of the mux clock for the internal RMII PHY */
+		clk_rate = clk_get_rate(dwmac->m250_mux_clk);
+
+		/* disable RGMII mode -> enables RMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_RGMII_MODE,
+					0);
+
+		/* invert internal clk_rmii_i to generate 25/2.5 tx_rx_clk */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
+					PRG_ETH0_INVERTED_RMII_CLK,
+					PRG_ETH0_INVERTED_RMII_CLK);
+
+		/* TX clock delay cannot be configured in RMII mode */
+		meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
+					0);
+
+		break;
+
+	default:
+		dev_err(&dwmac->pdev->dev, "unsupported phy-mode %s\n",
+			phy_modes(dwmac->phy_mode));
+		return -EINVAL;
+	}
+
+	ret = clk_prepare_enable(dwmac->m25_div_clk);
+	if (ret) {
+		dev_err(&dwmac->pdev->dev, "failed to enable the PHY clock\n");
+		return ret;
+	}
+
+	ret = clk_set_rate(dwmac->m25_div_clk, clk_rate);
+	if (ret) {
+		clk_disable_unprepare(dwmac->m25_div_clk);
+
+		dev_err(&dwmac->pdev->dev, "failed to set PHY clock\n");
+		return ret;
+	}
+
+	/* enable TX_CLK and PHY_REF_CLK generator */
+	meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
+				PRG_ETH0_TX_AND_PHY_REF_CLK);
+
+	return 0;
+}
+
+static int meson8b_dwmac_probe(struct platform_device *pdev)
+{
+	struct plat_stmmacenet_data *plat_dat;
+	struct stmmac_resources stmmac_res;
+	struct resource *res;
+	struct meson8b_dwmac *dwmac;
+	int ret;
+
+	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+	if (ret)
+		return ret;
+
+	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+	if (IS_ERR(plat_dat))
+		return PTR_ERR(plat_dat);
+
+	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+	if (!dwmac)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	dwmac->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(dwmac->regs))
+		return PTR_ERR(dwmac->regs);
+
+	dwmac->pdev = pdev;
+	dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
+	if (dwmac->phy_mode < 0) {
+		dev_err(&pdev->dev, "missing phy-mode property\n");
+		return -EINVAL;
+	}
+
+	ret = meson8b_init_clk(dwmac);
+	if (ret)
+		return ret;
+
+	ret = meson8b_init_prg_eth(dwmac);
+	if (ret)
+		return ret;
+
+	plat_dat->bsp_priv = dwmac;
+
+	return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+}
+
+static int meson8b_dwmac_remove(struct platform_device *pdev)
+{
+	struct meson8b_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
+
+	clk_disable_unprepare(dwmac->m25_div_clk);
+
+	return stmmac_pltfr_remove(pdev);
+}
+
+static const struct of_device_id meson8b_dwmac_match[] = {
+	{ .compatible = "amlogic,meson8b-dwmac" },
+	{ .compatible = "amlogic,meson-gxbb-dwmac" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, meson8b_dwmac_match);
+
+static struct platform_driver meson8b_dwmac_driver = {
+	.probe  = meson8b_dwmac_probe,
+	.remove = meson8b_dwmac_remove,
+	.driver = {
+		.name           = "meson8b-dwmac",
+		.pm		= &stmmac_pltfr_pm_ops,
+		.of_match_table = meson8b_dwmac_match,
+	},
+};
+module_platform_driver(meson8b_dwmac_driver);
+
+MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>");
+MODULE_DESCRIPTION("Amlogic Meson8b and GXBB DWMAC glue layer");
+MODULE_LICENSE("GPL v2");
-- 
2.9.3

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[PATCH v5 5/6] ARM64: dts: meson-gxbb: use the new GXBB DWMAC glue driver

[Martin Blumenstingl]

The Amlogic reference driver uses the "mc_val" devicetree property to
configure the PRG_ETHERNET_ADDR0 register. Unfortunately it uses magic
values for this configuration.
According to the datasheet the PRG_ETHERNET_ADDR0 register is at address
0xc8834108. However, the reference driver uses 0xc8834540 instead.
According to my tests, the value from the reference driver is correct.

No changes are required to the board dts files because the only
required configuration option is the phy-mode, which had to be
configured correctly before as well.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index 2b47415..2e8a3d9 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
@@ -497,13 +497,15 @@
 		};
 
 		ethmac: ethernet@c9410000 {
-			compatible = "amlogic,meson6-dwmac", "snps,dwmac";
+			compatible = "amlogic,meson-gxbb-dwmac", "snps,dwmac";
 			reg = <0x0 0xc9410000 0x0 0x10000
 			       0x0 0xc8834540 0x0 0x4>;
 			interrupts = <0 8 1>;
 			interrupt-names = "macirq";
-			clocks = <&clkc CLKID_ETH>;
-			clock-names = "stmmaceth";
+			clocks = <&clkc CLKID_ETH>,
+				 <&clkc CLKID_FCLK_DIV2>,
+				 <&clkc CLKID_MPLL2>;
+			clock-names = "stmmaceth", "clkin0", "clkin1";
 			phy-mode = "rgmii";
 			status = "disabled";
 		};
-- 
2.9.3

[PATCH v5 6/6] net: stmmac: update the module description of the dwmac-meson driver

[Martin Blumenstingl]

The dwmac-meson glue driver supports Meson6 and Meson8 SoCs. Newer SoCs
are supported by the dwmac-meson8b driver.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c
index c1bac19..309d995 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c
@@ -1,5 +1,5 @@
 /*
- * Amlogic Meson DWMAC glue layer
+ * Amlogic Meson6 and Meson8 DWMAC glue layer
  *
  * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
  *
@@ -96,5 +96,5 @@ static struct platform_driver meson6_dwmac_driver = {
 module_platform_driver(meson6_dwmac_driver);
 
 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
-MODULE_DESCRIPTION("Amlogic Meson DWMAC glue layer");
+MODULE_DESCRIPTION("Amlogic Meson6 and Meson8 DWMAC glue layer");
 MODULE_LICENSE("GPL v2");
-- 
2.9.3

Re: [PATCH v5 2/6] clk: gxbb: expose MPLL2 clock for use by DT

[Stephen Boyd]

On 09/06, Martin Blumenstingl wrote:
> This exposes the MPLL2 clock as this is one of the input clocks of the
> ethernet controller's internal mux.
> 
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---

Acked-by: Stephen Boyd <sboyd@codeaurora.org>

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