[PATCH 1/2] net:stmmac: dwmac-mediatek: add support for mt2712

Biao Huang
2018-10-29T03:04:53Z

Add Ethernet support for MediaTek SoCs from the mt2712 family

Signed-off-by: Biao Huang <biao.huang@mediatek.com>
---
drivers/net/ethernet/stmicro/stmmac/Kconfig | 8 +
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../net/ethernet/stmicro/stmmac/dwmac-mediatek.c | 364 ++++++++++++++++++++
3 files changed, 373 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index edf2036..76d779e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -75,6 +75,14 @@ config DWMAC_LPC18XX
---help---
Support for NXP LPC18xx/43xx DWMAC Ethernet.

+config DWMAC_MEDIATEK
+ tristate "MediaTek MT27xx GMAC support"
+ depends on OF
+ help
+ Support for MediaTek GMAC Ethernet controller.
+
+ This selects the MT2712 SoC support for the stmmac driver.
+
config DWMAC_MESON
tristate "Amlogic Meson dwmac support"
default ARCH_MESON
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 99967a8..bf09701 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_STMMAC_PLATFORM) += stmmac-platform.o
obj-$(CONFIG_DWMAC_ANARION) += dwmac-anarion.o
obj-$(CONFIG_DWMAC_IPQ806X) += dwmac-ipq806x.o
obj-$(CONFIG_DWMAC_LPC18XX) += dwmac-lpc18xx.o
+obj-$(CONFIG_DWMAC_MEDIATEK) += dwmac-mediatek.o
obj-$(CONFIG_DWMAC_MESON) += dwmac-meson.o dwmac-meson8b.o
obj-$(CONFIG_DWMAC_OXNAS) += dwmac-oxnas.o
obj-$(CONFIG_DWMAC_ROCKCHIP) += dwmac-rk.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
new file mode 100644
index 0000000..9ccf3a5
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
@@ -0,0 +1,364 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2018 MediaTek Inc.
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_net.h>
+#include <linux/regmap.h>
+#include <linux/stmmac.h>
+
+#include "stmmac.h"
+#include "stmmac_platform.h"
+
+/* Peri Configuration register */
+#define PERI_ETH_PHY_INTF_SEL 0x418
+#define PHY_INTF_MII_GMII 0
+#define PHY_INTF_RGMII 1
+#define PHY_INTF_RMII 4
+#define RMII_CLK_SRC_RXC BIT(4)
+#define RMII_CLK_SRC_INTERNAL BIT(5)
+
+#define PERI_ETH_PHY_DLY 0x428
+#define PHY_DLY_GTXC_INV BIT(6)
+#define PHY_DLY_GTXC_ENABLE BIT(5)
+#define PHY_DLY_GTXC_STAGES GENMASK(4, 0)
+#define PHY_DLY_TXC_INV BIT(20)
+#define PHY_DLY_TXC_ENABLE BIT(19)
+#define PHY_DLY_TXC_STAGES GENMASK(18, 14)
+#define PHY_DLY_TXC_SHIFT 14
+#define PHY_DLY_RXC_INV BIT(13)
+#define PHY_DLY_RXC_ENABLE BIT(12)
+#define PHY_DLY_RXC_STAGES GENMASK(11, 7)
+#define PHY_DLY_RXC_SHIFT 7
+
+#define PERI_ETH_DLY_FINE 0x800
+#define ETH_RMII_DLY_TX_INV BIT(2)
+#define ETH_FINE_DLY_GTXC BIT(1)
+#define ETH_FINE_DLY_RXC BIT(0)
+
+enum dwmac_clks_map {
+ DWMAC_CLK_AXI_DRAM,
+ DWMAC_CLK_APB_REG,
+ DWMAC_CLK_MAC_EXT,
+ DWMAC_CLK_MAC_PARENT,
+ DWMAC_CLK_PTP_REF,
+ DWMAC_CLK_PTP_PARENT,
+ DWMAC_CLK_PTP_TOP,
+ DWMAC_CLK_MAX
+};
+
+struct mac_delay_struct {
+ u32 tx_delay;
+ u32 rx_delay;
+ u32 tx_inv;
+ u32 rx_inv;
+};
+
+struct mediatek_dwmac_plat_data {
+ struct device *dev;
+ struct regmap *peri_regmap;
+ struct clk *clks[DWMAC_CLK_MAX];
+ struct device_node *np;
+ int phy_mode;
+ struct mac_delay_struct mac_delay;
+ const struct mediatek_dwmac_variant *variant;
+ int fine_tune;
+ int rmii_rxc;
+};
+
+struct mediatek_dwmac_variant {
+ int (*dwmac_config_dt)(struct mediatek_dwmac_plat_data *plat);
+ int (*dwmac_enable_clks)(struct mediatek_dwmac_plat_data *plat);
+ void (*dwmac_disable_clks)(struct mediatek_dwmac_plat_data *plat);
+};
+
+static const char * const mediatek_dwmac_clks_name[] = {
+ "axi", "apb", "mac_ext", "mac_parent", "ptp_ref", "ptp_parent", "ptp_top"
+};
+
+static int mt2712_set_interface(struct mediatek_dwmac_plat_data *plat)
+{
+ int rmii_rxc = plat->rmii_rxc ? RMII_CLK_SRC_RXC : 0;
+ u32 intf_val = 0;
+
+ /* select phy interface in top control domain */
+ switch (plat->phy_mode) {
+ case PHY_INTERFACE_MODE_MII:
+ intf_val |= PHY_INTF_MII_GMII;
+ break;
+ case PHY_INTERFACE_MODE_RMII:
+ intf_val |= PHY_INTF_RMII;
+ intf_val |= rmii_rxc;
+ break;
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ intf_val |= PHY_INTF_RGMII;
+ break;
+ default:
+ pr_err("phy interface not support\n");
+ return -EINVAL;
+ }
+
+ regmap_write(plat->peri_regmap, PERI_ETH_PHY_INTF_SEL, intf_val);
+
+ return 0;
+}
+
+static int mt2712_set_delay(struct mediatek_dwmac_plat_data *plat)
+{
+ struct mac_delay_struct *mac_delay = &plat->mac_delay;
+ u32 delay_val = 0;
+ u32 fine_val = 0;
+
+ switch (plat->phy_mode) {
+ case PHY_INTERFACE_MODE_MII:
+ delay_val |= mac_delay->tx_delay ? PHY_DLY_TXC_ENABLE : 0;
+ delay_val |= (mac_delay->tx_delay << PHY_DLY_TXC_SHIFT) &
+ PHY_DLY_TXC_STAGES;
+ delay_val |= mac_delay->tx_inv ? PHY_DLY_TXC_INV : 0;
+ delay_val |= mac_delay->rx_delay ? PHY_DLY_RXC_ENABLE : 0;
+ delay_val |= (mac_delay->rx_delay << PHY_DLY_RXC_SHIFT) &
+ PHY_DLY_RXC_STAGES;
+ delay_val |= mac_delay->rx_inv ? PHY_DLY_RXC_INV : 0;
+ break;
+ case PHY_INTERFACE_MODE_RMII:
+ if (plat->rmii_rxc) {
+ delay_val |= mac_delay->rx_delay ?
+ PHY_DLY_RXC_ENABLE : 0;
+ delay_val |= (mac_delay->rx_delay <<
+ PHY_DLY_RXC_SHIFT) & PHY_DLY_RXC_STAGES;
+ delay_val |= mac_delay->rx_inv ? PHY_DLY_RXC_INV : 0;
+ fine_val |= mac_delay->tx_inv ?
+ ETH_RMII_DLY_TX_INV : 0;
+ } else {
+ delay_val |= mac_delay->tx_delay ?
+ PHY_DLY_TXC_ENABLE : 0;
+ delay_val |= (mac_delay->tx_delay <<
+ PHY_DLY_TXC_SHIFT) & PHY_DLY_TXC_STAGES;
+ delay_val |= mac_delay->tx_inv ? PHY_DLY_TXC_INV : 0;
+ fine_val |= mac_delay->rx_inv ?
+ ETH_RMII_DLY_TX_INV : 0;
+ }
+ break;
+ case PHY_INTERFACE_MODE_RGMII:
+ fine_val = plat->fine_tune ?
+ (ETH_FINE_DLY_GTXC | ETH_FINE_DLY_RXC) : 0;
+ delay_val |= mac_delay->tx_delay ? PHY_DLY_GTXC_ENABLE : 0;
+ delay_val |= mac_delay->tx_delay & PHY_DLY_GTXC_STAGES;
+ delay_val |= mac_delay->tx_inv ? PHY_DLY_GTXC_INV : 0;
+ delay_val |= mac_delay->rx_delay ? PHY_DLY_RXC_ENABLE : 0;
+ delay_val |= (mac_delay->rx_delay << PHY_DLY_RXC_SHIFT) &
+ PHY_DLY_RXC_STAGES;
+ delay_val |= mac_delay->rx_inv ? PHY_DLY_RXC_INV : 0;
+ break;
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ fine_val = plat->fine_tune ? ETH_FINE_DLY_RXC : 0;
+ delay_val |= mac_delay->rx_delay ? PHY_DLY_RXC_ENABLE : 0;
+ delay_val |= (mac_delay->rx_delay << PHY_DLY_RXC_SHIFT) &
+ PHY_DLY_RXC_STAGES;
+ delay_val |= mac_delay->rx_inv ? PHY_DLY_RXC_INV : 0;
+ break;
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ fine_val = plat->fine_tune ? ETH_FINE_DLY_GTXC : 0;
+ delay_val |= mac_delay->tx_delay ? PHY_DLY_GTXC_ENABLE : 0;
+ delay_val |= mac_delay->tx_delay & PHY_DLY_GTXC_STAGES;
+ delay_val |= mac_delay->tx_inv ? PHY_DLY_GTXC_INV : 0;
+ break;
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ break;
+ default:
+ pr_err("phy interface not support\n");
+ return -EINVAL;
+ }
+ regmap_write(plat->peri_regmap, PERI_ETH_PHY_DLY, delay_val);
+ regmap_write(plat->peri_regmap, PERI_ETH_DLY_FINE, fine_val);
+
+ return 0;
+}
+
+static int mt2712_get_clks(struct mediatek_dwmac_plat_data *plat)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(plat->clks); i++) {
+ plat->clks[i] = devm_clk_get(plat->dev,
+ mediatek_dwmac_clks_name[i]);
+ if (IS_ERR(plat->clks[i]))
+ return PTR_ERR(plat->clks[i]);
+ }
+
+ return 0;
+}
+
+static int mt2712_enable_clks(struct mediatek_dwmac_plat_data *plat)
+{
+ int clk, ret;
+
+ for (clk = 0; clk < DWMAC_CLK_MAX ; clk++) {
+ ret = clk_prepare_enable(plat->clks[clk]);
+ if (ret)
+ goto err_disable_clks;
+ }
+
+ ret = clk_set_parent(plat->clks[DWMAC_CLK_MAC_EXT], plat->clks[DWMAC_CLK_MAC_PARENT]);
+ if (ret)
+ goto err_disable_clks;
+
+ ret = clk_set_parent(plat->clks[DWMAC_CLK_PTP_REF], plat->clks[DWMAC_CLK_PTP_PARENT]);
+ if (ret)
+ goto err_disable_clks;
+
+ return 0;
+
+err_disable_clks:
+ while (--clk >= 0)
+ clk_disable_unprepare(plat->clks[clk]);
+
+ return ret;
+}
+
+static void mt2712_disable_clks(struct mediatek_dwmac_plat_data *plat)
+{
+ int clk;
+
+ for (clk = DWMAC_CLK_MAX - 1; clk >= 0; clk--)
+ clk_disable_unprepare(plat->clks[clk]);
+}
+
+static int mt2712_config_dt(struct mediatek_dwmac_plat_data *plat)
+{
+ u32 mac_timings[4];
+
+ plat->peri_regmap = syscon_regmap_lookup_by_compatible("mediatek,mt2712-pericfg");
+ if (IS_ERR(plat->peri_regmap)) {
+ dev_err(plat->dev, "Failed to get pericfg syscon\n");
+ return PTR_ERR(plat->peri_regmap);
+ }
+
+ if (!of_property_read_u32_array(plat->np, "mac-delay", mac_timings,
+ ARRAY_SIZE(mac_timings))) {
+ plat->mac_delay.tx_delay = mac_timings[0];
+ plat->mac_delay.rx_delay = mac_timings[1];
+ plat->mac_delay.tx_inv = mac_timings[2];
+ plat->mac_delay.rx_inv = mac_timings[3];
+ }
+
+ plat->fine_tune = of_property_read_bool(plat->np, "fine-tune");
+
+ plat->rmii_rxc = of_property_read_bool(plat->np, "rmii-rxc");
+
+ mt2712_set_interface(plat);
+
+ mt2712_set_delay(plat);
+
+ return mt2712_get_clks(plat);
+}
+
+static const struct mediatek_dwmac_variant mt2712_gmac_variant = {
+ .dwmac_config_dt = mt2712_config_dt,
+ .dwmac_enable_clks = mt2712_enable_clks,
+ .dwmac_disable_clks = mt2712_disable_clks,
+};
+
+static int mediatek_dwmac_config_dt(struct mediatek_dwmac_plat_data *plat)
+{
+ const struct mediatek_dwmac_variant *variant = plat->variant;
+
+ /* Set the DMA mask, 4GB mode enabled */
+ dma_set_mask_and_coherent(plat->dev, DMA_BIT_MASK(33));
+
+ return variant->dwmac_config_dt(plat);
+}
+
+static int mediatek_dwmac_init(struct platform_device *pdev, void *priv)
+{
+ struct mediatek_dwmac_plat_data *plat = priv;
+ const struct mediatek_dwmac_variant *variant = plat->variant;
+
+ return variant->dwmac_enable_clks(plat);
+}
+
+static void mediatek_dwmac_exit(struct platform_device *pdev, void *priv)
+{
+ struct mediatek_dwmac_plat_data *plat = priv;
+ const struct mediatek_dwmac_variant *variant = plat->variant;
+
+ variant->dwmac_disable_clks(plat);
+}
+
+static int mediatek_dwmac_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ struct plat_stmmacenet_data *plat_dat;
+ struct stmmac_resources stmmac_res;
+ struct mediatek_dwmac_plat_data *priv_plat;
+
+ priv_plat = devm_kzalloc(&pdev->dev, sizeof(*priv_plat), GFP_KERNEL);
+ if (!priv_plat)
+ return -ENOMEM;
+
+ priv_plat->variant = of_device_get_match_data(&pdev->dev);
+ if (!priv_plat->variant) {
+ dev_err(&pdev->dev, "Missing dwmac-mediatek variant\n");
+ return -EINVAL;
+ }
+
+ priv_plat->dev = &pdev->dev;
+ priv_plat->np = pdev->dev.of_node;
+ priv_plat->phy_mode = of_get_phy_mode(priv_plat->np);
+
+ ret = mediatek_dwmac_config_dt(priv_plat);
+ if (ret)
+ return 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);
+
+ plat_dat->interface = priv_plat->phy_mode;
+ /* clk_csr_i = 250-300MHz & MDC = clk_csr_i/124 */
+ plat_dat->clk_csr = 5;
+ plat_dat->has_gmac4 = 1;
+ plat_dat->has_gmac = 0;
+ plat_dat->pmt = 0;
+ plat_dat->maxmtu = 1500;
+ plat_dat->bsp_priv = priv_plat;
+ plat_dat->init = mediatek_dwmac_init;
+ plat_dat->exit = mediatek_dwmac_exit;
+ mediatek_dwmac_init(pdev, priv_plat);
+
+ ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+ if (ret) {
+ stmmac_remove_config_dt(pdev, plat_dat);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id mediatek_dwmac_match[] = {
+ { .compatible = "mediatek,mt2712-gmac",
+ .data = &mt2712_gmac_variant },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, mediatek_dwmac_match);
+
+static struct platform_driver mediatek_dwmac_driver = {
+ .probe = mediatek_dwmac_probe,
+ .remove = stmmac_pltfr_remove,
+ .driver = {
+ .name = "dwmac-mediatek",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = mediatek_dwmac_match,
+ },
+};
+module_platform_driver(mediatek_dwmac_driver);
--
1.7.9.5