* [PATCH v5 1/3] ARM: imx: Add LVDS general-purpose clocks to i.MX6Q
[not found] ` <1379310497-12362-1-git-send-email-xobs-nXMMniAx+RbQT0dZR+AlfA@public.gmane.org>
@ 2013-09-16 5:48 ` Sean Cross
[not found] ` <1379310497-12362-2-git-send-email-xobs-nXMMniAx+RbQT0dZR+AlfA@public.gmane.org>
2013-09-16 5:48 ` [PATCH v5 3/3] PCI: imx6: Add support for i.MX6 PCIe controller Sean Cross
1 sibling, 1 reply; 7+ messages in thread
From: Sean Cross @ 2013-09-16 5:48 UTC (permalink / raw)
To: devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-pci-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: Sascha Hauer, Zhu Richard-R65037, Shawn Guo,
tharvey-UMMOYl/HMS+akBO8gow8eQ, bhelgaas-hpIqsD4AKlfQT0dZR+AlfA,
Sean Cross
The i.MX6 has two general-purpose LVDS clocks that can be driven
from a variety of sources. This patch adds a mux and a gate for
both of these clocks.
Signed-off-by: Sean Cross <xobs-nXMMniAx+RbQT0dZR+AlfA@public.gmane.org>
---
.../devicetree/bindings/clock/imx6q-clock.txt | 4 ++++
arch/arm/mach-imx/clk-imx6q.c | 22 +++++++++++++++++++-
2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/clock/imx6q-clock.txt b/Documentation/devicetree/bindings/clock/imx6q-clock.txt
index 5a90a72..35e82c7 100644
--- a/Documentation/devicetree/bindings/clock/imx6q-clock.txt
+++ b/Documentation/devicetree/bindings/clock/imx6q-clock.txt
@@ -215,6 +215,10 @@ clocks and IDs.
cko2 200
cko 201
vdoa 202
+ lvds1_sel 203
+ lvds2_sel 204
+ lvds1_gate 205
+ lvds2_gate 206
Examples:
diff --git a/arch/arm/mach-imx/clk-imx6q.c b/arch/arm/mach-imx/clk-imx6q.c
index 9181a24..971356b 100644
--- a/arch/arm/mach-imx/clk-imx6q.c
+++ b/arch/arm/mach-imx/clk-imx6q.c
@@ -217,6 +217,11 @@ static const char *cko2_sels[] = {
"uart_serial", "spdif", "asrc", "hsi_tx",
};
static const char *cko_sels[] = { "cko1", "cko2", };
+static const char *lvds_sels[] = {
+ "dummy", "dummy", "dummy", "dummy", "dummy", "dummy",
+ "pll4_audio", "pll5_video", "pll8_mlb", "enet_ref",
+ "pcie_ref", "sata_ref",
+};
enum mx6q_clks {
dummy, ckil, ckih, osc, pll2_pfd0_352m, pll2_pfd1_594m, pll2_pfd2_396m,
@@ -251,7 +256,8 @@ enum mx6q_clks {
ssi2_ipg, ssi3_ipg, rom, usbphy1, usbphy2, ldb_di0_div_3_5, ldb_di1_div_3_5,
sata_ref, sata_ref_100m, pcie_ref, pcie_ref_125m, enet_ref, usbphy1_gate,
usbphy2_gate, pll4_post_div, pll5_post_div, pll5_video_div, eim_slow,
- spdif, cko2_sel, cko2_podf, cko2, cko, vdoa, clk_max
+ spdif, cko2_sel, cko2_podf, cko2, cko, vdoa,
+ lvds1_sel, lvds2_sel, lvds1_gate, lvds2_gate, clk_max
};
static struct clk *clk[clk_max];
@@ -342,6 +348,18 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node)
base + 0xe0, 0, 2, 0, clk_enet_ref_table,
&imx_ccm_lock);
+ clk[lvds1_sel] = imx_clk_mux("lvds1_sel", base + 0x160, 0, 5, lvds_sels, ARRAY_SIZE(lvds_sels));
+ clk[lvds2_sel] = imx_clk_mux("lvds2_sel", base + 0x160, 5, 5, lvds_sels, ARRAY_SIZE(lvds_sels));
+
+ /*
+ * lvds1_gate and lvds2_gate are pseudo-gates. Both can be
+ * independently configured as clock inputs or outputs. We treat
+ * the "output_enable" bit as a gate, even though it's really just
+ * enabling clock output.
+ */
+ clk[lvds1_gate] = imx_clk_gate("lvds1_gate", "dummy", base + 0x160, 10);
+ clk[lvds2_gate] = imx_clk_gate("lvds2_gate", "dummy", base + 0x160, 11);
+
/* name parent_name reg idx */
clk[pll2_pfd0_352m] = imx_clk_pfd("pll2_pfd0_352m", "pll2_bus", base + 0x100, 0);
clk[pll2_pfd1_594m] = imx_clk_pfd("pll2_pfd1_594m", "pll2_bus", base + 0x100, 1);
@@ -569,6 +587,8 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node)
clk_register_clkdev(clk[cko1_sel], "cko1_sel", NULL);
clk_register_clkdev(clk[ahb], "ahb", NULL);
clk_register_clkdev(clk[cko1], "cko1", NULL);
+ clk_register_clkdev(clk[lvds1_gate], "lvds1_gate", NULL);
+ clk_register_clkdev(clk[lvds2_gate], "lvds2_gate", NULL);
clk_register_clkdev(clk[arm], NULL, "cpu0");
clk_register_clkdev(clk[pll4_post_div], "pll4_post_div", NULL);
clk_register_clkdev(clk[pll4_audio], "pll4_audio", NULL);
--
1.7.9.5
--
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^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH v5 3/3] PCI: imx6: Add support for i.MX6 PCIe controller
[not found] ` <1379310497-12362-1-git-send-email-xobs-nXMMniAx+RbQT0dZR+AlfA@public.gmane.org>
2013-09-16 5:48 ` [PATCH v5 1/3] ARM: imx: Add LVDS general-purpose clocks to i.MX6Q Sean Cross
@ 2013-09-16 5:48 ` Sean Cross
[not found] ` <1379310497-12362-4-git-send-email-xobs-nXMMniAx+RbQT0dZR+AlfA@public.gmane.org>
1 sibling, 1 reply; 7+ messages in thread
From: Sean Cross @ 2013-09-16 5:48 UTC (permalink / raw)
To: devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-pci-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: Sascha Hauer, Zhu Richard-R65037, Shawn Guo,
tharvey-UMMOYl/HMS+akBO8gow8eQ, bhelgaas-hpIqsD4AKlfQT0dZR+AlfA,
Sean Cross
Add support for the PCIe port present on the i.MX6 family of controllers.
These use the Synopsis Designware core tied to their own PHY.
Signed-off-by: Sean Cross <xobs-nXMMniAx+RbQT0dZR+AlfA@public.gmane.org>
---
.../devicetree/bindings/pci/designware-pcie.txt | 5 +
arch/arm/boot/dts/imx6qdl.dtsi | 16 +
arch/arm/mach-imx/Kconfig | 2 +
arch/arm/mach-imx/clk-imx6q.c | 12 +
drivers/pci/host/Kconfig | 6 +
drivers/pci/host/Makefile | 1 +
drivers/pci/host/pci-imx6.c | 499 ++++++++++++++++++++
7 files changed, 541 insertions(+)
create mode 100644 drivers/pci/host/pci-imx6.c
diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt
index eabcb4b..41d8419 100644
--- a/Documentation/devicetree/bindings/pci/designware-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
@@ -21,6 +21,11 @@ Required properties:
- num-lanes: number of lanes to use
- reset-gpio: gpio pin number of power good signal
+Optional properties for fsl,imx6-pcie
+- power-on-gpio: gpio pin number of power-enable signal
+- wake-up-gpio: gpio pin number of incoming wakeup signal
+- disable-gpio: gpio pin number of outgoing rfkill/endpoint disable signal
+
Example:
SoC specific DT Entry:
diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index ccd55c2..ec72271 100644
--- a/arch/arm/boot/dts/imx6qdl.dtsi
+++ b/arch/arm/boot/dts/imx6qdl.dtsi
@@ -116,6 +116,22 @@
arm,data-latency = <4 2 3>;
};
+ pcie: pcie@0x01000000 {
+ compatible = "fsl,imx6-pcie", "snps,dw-pcie";
+ reg = <0x01ffc000 0x4000>; /* DBI */
+
+ #address-cells = <3>;
+ #size-cells = <2>;
+ device_type = "pci";
+ ranges = <0x00000800 0 0x01f00000 0x01f00000 0 0x00080000 /* configuration space */
+ 0x81000000 0 0 0x01f80000 0 0x00010000 /* downstream I/O */
+ 0x82000000 0 0x01000000 0x01000000 0 0x00f00000>; /* non-prefetchable memory */
+
+ num-lanes = <1>;
+ interrupts = <0 123 0x04>;
+ status = "disabled";
+ };
+
pmu {
compatible = "arm,cortex-a9-pmu";
interrupts = <0 94 0x04>;
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 29a8af6..e6ac281 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -801,6 +801,8 @@ config SOC_IMX6Q
select HAVE_IMX_SRC
select HAVE_SMP
select MFD_SYSCON
+ select MIGHT_HAVE_PCI
+ select PCI_DOMAINS if PCI
select PINCTRL
select PINCTRL_IMX6Q
select PL310_ERRATA_588369 if CACHE_PL310
diff --git a/arch/arm/mach-imx/clk-imx6q.c b/arch/arm/mach-imx/clk-imx6q.c
index 971356b..d30ff63 100644
--- a/arch/arm/mach-imx/clk-imx6q.c
+++ b/arch/arm/mach-imx/clk-imx6q.c
@@ -623,6 +623,18 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node)
if (ret)
pr_warn("failed to set up CLKO: %d\n", ret);
+ /*
+ * All existing boards with PCIe use LVDS1
+ */
+ if (IS_ENABLED(CONFIG_PCI_IMX6)) {
+ clk_set_parent(clk[lvds1_sel], clk[sata_ref]);
+ clk_prepare_enable(clk[lvds1_gate]);
+ clk_prepare_enable(clk[pcie_ref_125m]);
+ clk_prepare_enable(clk[sata_ref_100m]);
+ clk_prepare_enable(clk[pcie_axi]);
+ }
+
+
/* Set initial power mode */
imx6q_set_lpm(WAIT_CLOCKED);
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 3d95048..efa24d9 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -15,6 +15,12 @@ config PCI_EXYNOS
select PCIEPORTBUS
select PCIE_DW
+config PCI_IMX6
+ bool "Freescale i.MX6 PCIe controller"
+ depends on SOC_IMX6Q
+ select PCIEPORTBUS
+ select PCIE_DW
+
config PCI_TEGRA
bool "NVIDIA Tegra PCIe controller"
depends on ARCH_TEGRA
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index c9a997b..287d6a0 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -1,4 +1,5 @@
obj-$(CONFIG_PCIE_DW) += pcie-designware.o
obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
+obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
new file mode 100644
index 0000000..e6a1726
--- /dev/null
+++ b/drivers/pci/host/pci-imx6.c
@@ -0,0 +1,499 @@
+/*
+ * PCIe host controller driver for Freescale i.MX6 SoCs
+ *
+ * Copyright (C) 2013 Kosagi
+ * http://www.kosagi.com
+ *
+ * Author: Sean Cross <xobs-nXMMniAx+RbQT0dZR+AlfA@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.
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+#include <linux/signal.h>
+#include <linux/types.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
+
+#include "pcie-designware.h"
+
+#define to_imx6_pcie(x) container_of(x, struct imx6_pcie, pp)
+
+struct imx6_pcie {
+ int reset_gpio;
+ int power_on_gpio;
+ int wake_up_gpio;
+ int disable_gpio;
+ struct pcie_port pp;
+ struct regmap *iomuxc_gpr;
+ void __iomem *mem_base;
+};
+
+/* PCIe Port Logic registers (memory-mapped) */
+#define PL_OFFSET 0x700
+#define PCIE_PHY_DEBUG_R0 (PL_OFFSET + 0x28)
+#define PCIE_PHY_DEBUG_R1 (PL_OFFSET + 0x2c)
+
+#define PCIE_PHY_CTRL (PL_OFFSET + 0x114)
+#define PCIE_PHY_CTRL_DATA_LOC 0
+#define PCIE_PHY_CTRL_CAP_ADR_LOC 16
+#define PCIE_PHY_CTRL_CAP_DAT_LOC 17
+#define PCIE_PHY_CTRL_WR_LOC 18
+#define PCIE_PHY_CTRL_RD_LOC 19
+
+#define PCIE_PHY_STAT (PL_OFFSET + 0x110)
+#define PCIE_PHY_STAT_DATA_LOC 0
+#define PCIE_PHY_STAT_ACK_LOC 16
+
+/* PHY registers (not memory-mapped) */
+#define PCIE_PHY_RX_ASIC_OUT 0x100D
+
+#define PHY_RX_OVRD_IN_LO 0x1005
+#define PHY_RX_OVRD_IN_LO_RX_DATA_EN (1<<5)
+#define PHY_RX_OVRD_IN_LO_RX_PLL_EN (1<<3)
+
+static int pcie_phy_poll_ack(void __iomem *dbi_base, int exp_val)
+{
+ u32 val;
+ u32 max_iterations = 10;
+ u32 wait_counter = 0;
+
+ do {
+ val = readl(dbi_base + PCIE_PHY_STAT);
+ val = (val >> PCIE_PHY_STAT_ACK_LOC) & 0x1;
+ wait_counter++;
+ udelay(1);
+ } while ((wait_counter < max_iterations) && (val != exp_val));
+
+ if (val != exp_val)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+static int pcie_phy_wait_ack(void __iomem *dbi_base, int addr)
+{
+ u32 val;
+ int ret;
+
+ val = addr << PCIE_PHY_CTRL_DATA_LOC;
+ writel(val, dbi_base + PCIE_PHY_CTRL);
+
+ val |= (0x1 << PCIE_PHY_CTRL_CAP_ADR_LOC);
+ writel(val, dbi_base + PCIE_PHY_CTRL);
+
+ ret = pcie_phy_poll_ack(dbi_base, 1);
+ if (ret)
+ return ret;
+
+ val = addr << PCIE_PHY_CTRL_DATA_LOC;
+ writel(val, dbi_base + PCIE_PHY_CTRL);
+
+ ret = pcie_phy_poll_ack(dbi_base, 0);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/* Read from the 16-bit PCIe PHY control registers (not memory-mapped) */
+static int pcie_phy_read(void __iomem *dbi_base, int addr , int *data)
+{
+ u32 val, phy_ctl;
+ int ret;
+
+ ret = pcie_phy_wait_ack(dbi_base, addr);
+ if (ret)
+ return ret;
+
+ /* assert Read signal */
+ phy_ctl = 0x1 << PCIE_PHY_CTRL_RD_LOC;
+ writel(phy_ctl, dbi_base + PCIE_PHY_CTRL);
+
+ ret = pcie_phy_poll_ack(dbi_base, 1);
+ if (ret)
+ return ret;
+
+ val = readl(dbi_base + PCIE_PHY_STAT);
+ *data = (val & (0xffff << PCIE_PHY_STAT_DATA_LOC));
+
+ /* deassert Read signal */
+ writel(0x00, dbi_base + PCIE_PHY_CTRL);
+
+ ret = pcie_phy_poll_ack(dbi_base, 0);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int pcie_phy_write(void __iomem *dbi_base, int addr, int data)
+{
+ u32 var;
+ int ret;
+
+ /* write addr */
+ /* cap addr */
+ ret = pcie_phy_wait_ack(dbi_base, addr);
+ if (ret)
+ return ret;
+
+ var = data << PCIE_PHY_CTRL_DATA_LOC;
+ writel(var, dbi_base + PCIE_PHY_CTRL);
+
+ /* capture data */
+ var |= (0x1 << PCIE_PHY_CTRL_CAP_DAT_LOC);
+ writel(var, dbi_base + PCIE_PHY_CTRL);
+
+ ret = pcie_phy_poll_ack(dbi_base, 1);
+ if (ret)
+ return ret;
+
+ /* deassert cap data */
+ var = data << PCIE_PHY_CTRL_DATA_LOC;
+ writel(var, dbi_base + PCIE_PHY_CTRL);
+
+ /* wait for ack de-assetion */
+ ret = pcie_phy_poll_ack(dbi_base, 0);
+ if (ret)
+ return ret;
+
+ /* assert wr signal */
+ var = 0x1 << PCIE_PHY_CTRL_WR_LOC;
+ writel(var, dbi_base + PCIE_PHY_CTRL);
+
+ /* wait for ack */
+ ret = pcie_phy_poll_ack(dbi_base, 1);
+ if (ret)
+ return ret;
+
+ /* deassert wr signal */
+ var = data << PCIE_PHY_CTRL_DATA_LOC;
+ writel(var, dbi_base + PCIE_PHY_CTRL);
+
+ /* wait for ack de-assetion */
+ ret = pcie_phy_poll_ack(dbi_base, 0);
+ if (ret)
+ return ret;
+
+ writel(0x0, dbi_base + PCIE_PHY_CTRL);
+
+ return 0;
+}
+
+/* Added for PCI abort handling */
+static int imx6q_pcie_abort_handler(unsigned long addr,
+ unsigned int fsr, struct pt_regs *regs)
+{
+ /*
+ * If it was an imprecise abort, then we need to correct the
+ * return address to be _after_ the instruction.
+ */
+ if (fsr & (1 << 10))
+ regs->ARM_pc += 4;
+ return 0;
+}
+
+static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
+{
+ struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+ IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6Q_GPR12_PCIE_CTL_2, 1 << 10);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+ IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
+
+ gpio_set_value(imx6_pcie->reset_gpio, 0);
+ msleep(100);
+ gpio_set_value(imx6_pcie->reset_gpio, 1);
+
+ return 0;
+}
+
+static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
+{
+ struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
+
+ if (gpio_is_valid(imx6_pcie->power_on_gpio))
+ gpio_set_value(imx6_pcie->power_on_gpio, 1);
+
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+ IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+ IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+
+ /* allow the clocks to stabilize */
+ usleep_range(200, 500);
+
+ return 0;
+}
+
+static void imx6_pcie_init_phy(struct pcie_port *pp)
+{
+ struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
+
+ /* FIXME the field name should be aligned to RM */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
+
+ /* configure constant input signal to the pcie ctrl and phy */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6Q_GPR12_DEVICE_TYPE, PCI_EXP_TYPE_ROOT_PORT << 12);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6Q_GPR12_LOS_LEVEL, 9 << 4);
+
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
+ IMX6Q_GPR8_TX_DEEMPH_GEN1, 0 << 0);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
+ IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB, 0 << 6);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
+ IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB, 20 << 12);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
+ IMX6Q_GPR8_TX_SWING_FULL, 127 << 18);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
+ IMX6Q_GPR8_TX_SWING_LOW, 127 << 25);
+}
+
+static void imx6_pcie_host_init(struct pcie_port *pp)
+{
+ int count = 0;
+ struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
+
+ imx6_pcie_assert_core_reset(pp);
+
+ imx6_pcie_init_phy(pp);
+
+ imx6_pcie_deassert_core_reset(pp);
+
+ dw_pcie_setup_rc(pp);
+
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6Q_GPR12_PCIE_CTL_2, 1 << 10);
+
+ while (!dw_pcie_link_up(pp)) {
+ usleep_range(100, 1000);
+ count++;
+ if (count >= 10) {
+ dev_err(pp->dev, "phy link never came up\n");
+ dev_dbg(pp->dev,"DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
+ readl(pp->dbi_base + PCIE_PHY_DEBUG_R0),
+ readl(pp->dbi_base + PCIE_PHY_DEBUG_R1));
+ break;
+ }
+ }
+
+ return;
+}
+
+static int imx6_pcie_link_up(struct pcie_port *pp)
+{
+ u32 rc, ltssm, rx_valid, temp;
+
+ /* link is debug bit 36, debug register 1 starts at bit 32 */
+ rc = readl(pp->dbi_base + PCIE_PHY_DEBUG_R1) & (0x1 << (36 - 32));
+ if (rc)
+ return -EAGAIN;
+
+ /* From L0, initiate MAC entry to gen2 if EP/RC supports gen2.
+ * Wait 2ms (LTSSM timeout is 24ms, PHY lock is ~5us in gen2).
+ * If (MAC/LTSSM.state == Recovery.RcvrLock)
+ * && (PHY/rx_valid==0) then pulse PHY/rx_reset. Transition
+ * to gen2 is stuck
+ */
+ pcie_phy_read(pp->dbi_base, PCIE_PHY_RX_ASIC_OUT, &rx_valid);
+ ltssm = readl(pp->dbi_base + PCIE_PHY_DEBUG_R0) & 0x3F;
+
+ if (rx_valid & 0x01)
+ return 0;
+
+ if (ltssm != 0x0d)
+ return 0;
+
+ dev_err(pp->dev,
+ "transition to gen2 is stuck, reset PHY!\n");
+
+ pcie_phy_read(pp->dbi_base,
+ PHY_RX_OVRD_IN_LO, &temp);
+ temp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN
+ | PHY_RX_OVRD_IN_LO_RX_PLL_EN);
+ pcie_phy_write(pp->dbi_base,
+ PHY_RX_OVRD_IN_LO, temp);
+
+ usleep_range(2000, 3000);
+
+ pcie_phy_read(pp->dbi_base,
+ PHY_RX_OVRD_IN_LO, &temp);
+ temp &= ~(PHY_RX_OVRD_IN_LO_RX_DATA_EN
+ | PHY_RX_OVRD_IN_LO_RX_PLL_EN);
+ pcie_phy_write(pp->dbi_base,
+ PHY_RX_OVRD_IN_LO, temp);
+
+ return 0;
+}
+
+static struct pcie_host_ops imx6_pcie_host_ops = {
+ .link_up = imx6_pcie_link_up,
+ .host_init = imx6_pcie_host_init,
+};
+
+static int add_pcie_port(struct pcie_port *pp, struct platform_device *pdev)
+{
+ int ret;
+
+ pp->irq = platform_get_irq(pdev, 0);
+ if (!pp->irq) {
+ dev_err(&pdev->dev, "failed to get irq\n");
+ return -ENODEV;
+ }
+
+ pp->root_bus_nr = -1;
+ pp->ops = &imx6_pcie_host_ops;
+
+ spin_lock_init(&pp->conf_lock);
+ ret = dw_pcie_host_init(pp);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to initialize host\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __init imx6_pcie_probe(struct platform_device *pdev)
+{
+ struct imx6_pcie *imx6_pcie;
+ struct pcie_port *pp;
+ struct device_node *np = pdev->dev.of_node;
+ struct resource *dbi_base;
+ int ret;
+
+ imx6_pcie = devm_kzalloc(&pdev->dev, sizeof(*imx6_pcie),
+ GFP_KERNEL);
+ if (!imx6_pcie)
+ return -ENOMEM;
+
+ pp = &imx6_pcie->pp;
+ pp->dev = &pdev->dev;
+
+ /* Added for PCI abort handling */
+ hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
+ "imprecise external abort");
+
+ dbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!dbi_base) {
+ dev_err(&pdev->dev, "dbi_base memory resource not found\n");
+ return -ENODEV;
+ }
+
+ pp->dbi_base = devm_request_and_ioremap(&pdev->dev, dbi_base);
+ if (IS_ERR(pp->dbi_base)) {
+ dev_err(&pdev->dev, "unable to remap dbi_base\n");
+ ret = PTR_ERR(pp->dbi_base);
+ goto err;
+ }
+
+ /* Fetch GPIOs */
+ imx6_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
+ if (gpio_is_valid(imx6_pcie->reset_gpio)) {
+ ret = devm_gpio_request_one(&pdev->dev,
+ imx6_pcie->reset_gpio,
+ GPIOF_OUT_INIT_LOW,
+ "PCIe reset");
+ if (ret) {
+ dev_err(&pdev->dev, "unable to get reset gpio\n");
+ goto err;
+ }
+ }
+
+ imx6_pcie->power_on_gpio = of_get_named_gpio(np, "power-on-gpio", 0);
+ if (gpio_is_valid(imx6_pcie->power_on_gpio)) {
+ ret = devm_gpio_request_one(&pdev->dev,
+ imx6_pcie->power_on_gpio,
+ GPIOF_OUT_INIT_LOW,
+ "PCIe power enable");
+ if (ret) {
+ dev_err(&pdev->dev, "unable to get power-on gpio\n");
+ goto err;
+ }
+ }
+
+ imx6_pcie->wake_up_gpio = of_get_named_gpio(np, "wake-up-gpio", 0);
+ if (gpio_is_valid(imx6_pcie->wake_up_gpio)) {
+ ret = devm_gpio_request_one(&pdev->dev,
+ imx6_pcie->wake_up_gpio,
+ GPIOF_IN,
+ "PCIe wake up");
+ if (ret) {
+ dev_err(&pdev->dev, "unable to get wake-up gpio\n");
+ goto err;
+ }
+ }
+
+ imx6_pcie->disable_gpio = of_get_named_gpio(np, "disable-gpio", 0);
+ if (gpio_is_valid(imx6_pcie->disable_gpio)) {
+ ret = devm_gpio_request_one(&pdev->dev,
+ imx6_pcie->disable_gpio,
+ GPIOF_OUT_INIT_HIGH,
+ "PCIe disable endpoint");
+ if (ret) {
+ dev_err(&pdev->dev, "unable to get disable-ep gpio\n");
+ goto err;
+ }
+ }
+
+ /* Grab GPR config register range */
+ imx6_pcie->iomuxc_gpr =
+ syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
+ if (IS_ERR(imx6_pcie->iomuxc_gpr)) {
+ dev_err(&pdev->dev, "unable to find iomuxc registers\n");
+ ret = PTR_ERR(imx6_pcie->iomuxc_gpr);
+ goto err;
+ }
+
+ ret = add_pcie_port(pp, pdev);
+ if (ret < 0)
+ goto err;
+
+ platform_set_drvdata(pdev, imx6_pcie);
+ return 0;
+
+err:
+ return ret;
+}
+
+static const struct of_device_id imx6_pcie_of_match[] = {
+ { .compatible = "fsl,imx6-pcie", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);
+
+static struct platform_driver imx6_pcie_driver = {
+ .driver = {
+ .name = "imx6-pcie",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(imx6_pcie_of_match),
+ },
+};
+
+/* Freescale PCIe driver does not allow module unload */
+
+static int __init pcie_init(void)
+{
+ return platform_driver_probe(&imx6_pcie_driver, imx6_pcie_probe);
+}
+subsys_initcall(pcie_init);
+
+MODULE_AUTHOR("Sean Cross <xobs-nXMMniAx+RbQT0dZR+AlfA@public.gmane.org>");
+MODULE_DESCRIPTION("Freescale i.MX6 PCIe host controller driver");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5
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