diff options
author | Luka Perkov <luka@openwrt.org> | 2013-09-20 01:59:32 +0000 |
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committer | Luka Perkov <luka@openwrt.org> | 2013-09-20 01:59:32 +0000 |
commit | 3f059f58dba3a1fb9e1e5035b437273f095040f6 (patch) | |
tree | 44c82a0cd9241d3fc277920c5887520abc1ca419 /target/linux/imx6/patches-3.10/0012-PCI-imx6-Add-support-for-i.MX6-PCIe-controller.patch | |
parent | 19bd25f4ecd20066554eb0c4df4cbff0213a9ae5 (diff) | |
download | mtk-20170518-3f059f58dba3a1fb9e1e5035b437273f095040f6.zip mtk-20170518-3f059f58dba3a1fb9e1e5035b437273f095040f6.tar.gz mtk-20170518-3f059f58dba3a1fb9e1e5035b437273f095040f6.tar.bz2 |
imx6: update PCIe driver
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Luka Perkov <luka@openwrt.org>
SVN-Revision: 38080
Diffstat (limited to 'target/linux/imx6/patches-3.10/0012-PCI-imx6-Add-support-for-i.MX6-PCIe-controller.patch')
-rw-r--r-- | target/linux/imx6/patches-3.10/0012-PCI-imx6-Add-support-for-i.MX6-PCIe-controller.patch | 674 |
1 files changed, 674 insertions, 0 deletions
diff --git a/target/linux/imx6/patches-3.10/0012-PCI-imx6-Add-support-for-i.MX6-PCIe-controller.patch b/target/linux/imx6/patches-3.10/0012-PCI-imx6-Add-support-for-i.MX6-PCIe-controller.patch new file mode 100644 index 0000000..029245a --- /dev/null +++ b/target/linux/imx6/patches-3.10/0012-PCI-imx6-Add-support-for-i.MX6-PCIe-controller.patch @@ -0,0 +1,674 @@ +Subject: [v6,3/3] PCI: imx6: Add support for i.MX6 PCIe controller +From: Sean Cross <xobs@kosagi.com> + +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@kosagi.com> +Acked-by: Bjorn Helgaas <bhelgaas@google.com> +Acked-by: Sascha Hauer <s.hauer@pengutronix.de> +--- + arch/arm/boot/dts/imx6qdl.dtsi | 16 + + arch/arm/mach-imx/Kconfig | 2 + + arch/arm/mach-imx/clk-imx6q.c | 4 + + drivers/pci/host/Kconfig | 6 + + drivers/pci/host/Makefile | 1 + + drivers/pci/host/pci-imx6.c | 576 ++++++++++++++++++++ + 7 files changed, 611 insertions(+), 1 deletion(-) + create mode 100644 drivers/pci/host/pci-imx6.c + +diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi +index ccd55c2..125202e 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,imx6q-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>; ++ clocks = <&clks 189>, <&clks 187>, <&clks 205>, <&clks 144>; ++ clock-names = "pcie_ref_125m", "sata_ref_100m", "lvds_gate", "pcie_axi"; ++ 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 d94be84..6956995 100644 +--- a/arch/arm/mach-imx/clk-imx6q.c ++++ b/arch/arm/mach-imx/clk-imx6q.c +@@ -621,6 +621,10 @@ 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]); ++ + /* Set initial power mode */ + imx6q_set_lpm(WAIT_CLOCKED); + +--- /dev/null ++++ b/drivers/pci/host/Kconfig +@@ -0,0 +1,13 @@ ++menu "PCI host controller drivers" ++ depends on PCI ++ ++config PCIE_DW ++ bool ++ ++config PCI_IMX6 ++ bool "Freescale i.MX6 PCIe controller" ++ depends on SOC_IMX6Q ++ select PCIEPORTBUS ++ select PCIE_DW ++ ++endmenu +--- /dev/null ++++ b/drivers/pci/host/Makefile +@@ -0,0 +1,2 @@ ++obj-$(CONFIG_PCIE_DW) += pcie-designware.o ++obj-$(CONFIG_PCI_IMX6) += pci-imx6.o +--- /dev/null ++++ b/drivers/pci/host/pci-imx6.c +@@ -0,0 +1,576 @@ ++/* ++ * PCIe host controller driver for Freescale i.MX6 SoCs ++ * ++ * Copyright (C) 2013 Kosagi ++ * http://www.kosagi.com ++ * ++ * Author: Sean Cross <xobs@kosagi.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. ++ */ ++ ++#include <linux/clk.h> ++#include <linux/delay.h> ++#include <linux/gpio.h> ++#include <linux/kernel.h> ++#include <linux/mfd/syscon.h> ++#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> ++#include <linux/module.h> ++#include <linux/of_gpio.h> ++#include <linux/pci.h> ++#include <linux/platform_device.h> ++#include <linux/regmap.h> ++#include <linux/resource.h> ++#include <linux/signal.h> ++#include <linux/types.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 clk *lvds_gate; ++ struct clk *sata_ref_100m; ++ struct clk *pcie_ref_125m; ++ struct clk *pcie_axi; ++ 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_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++; ++ ++ if (val == exp_val) ++ return 0; ++ ++ udelay(1); ++ } while ((wait_counter < max_iterations) && (val != exp_val)); ++ ++ return -ETIMEDOUT; ++} ++ ++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; ++ ++ /* 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); ++ int ret; ++ ++ 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); ++ ++ ret = clk_prepare_enable(imx6_pcie->sata_ref_100m); ++ if (ret) { ++ dev_err(pp->dev, "unable to enable sata_ref_100m\n"); ++ goto err_sata_ref; ++ } ++ ++ ret = clk_prepare_enable(imx6_pcie->pcie_ref_125m); ++ if (ret) { ++ dev_err(pp->dev, "unable to enable pcie_ref_125m\n"); ++ goto err_pcie_ref; ++ } ++ ++ ret = clk_prepare_enable(imx6_pcie->lvds_gate); ++ if (ret) { ++ dev_err(pp->dev, "unable to enable lvds_gate\n"); ++ goto err_lvds_gate; ++ } ++ ++ ret = clk_prepare_enable(imx6_pcie->pcie_axi); ++ if (ret) { ++ dev_err(pp->dev, "unable to enable pcie_axi\n"); ++ goto err_pcie_axi; ++ } ++ ++ /* allow the clocks to stabilize */ ++ usleep_range(200, 500); ++ ++ return 0; ++ ++err_pcie_axi: ++ clk_disable_unprepare(imx6_pcie->lvds_gate); ++err_lvds_gate: ++ clk_disable_unprepare(imx6_pcie->pcie_ref_125m); ++err_pcie_ref: ++ clk_disable_unprepare(imx6_pcie->sata_ref_100m); ++err_sata_ref: ++ return ret; ++ ++} ++ ++static void imx6_pcie_init_phy(struct pcie_port *pp) ++{ ++ struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp); ++ ++ 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 imx6_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_ioremap_resource(&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)) { ++ dev_err(&pdev->dev, "no reset-gpio defined\n"); ++ ret = -ENODEV; ++ } ++ 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; ++ } ++ } ++ ++ /* Fetch clocks */ ++ imx6_pcie->lvds_gate = clk_get(&pdev->dev, "lvds_gate"); ++ if (IS_ERR(imx6_pcie->lvds_gate)) { ++ dev_err(&pdev->dev, ++ "lvds_gate clock select missing or invalid\n"); ++ ret = PTR_ERR(imx6_pcie->lvds_gate); ++ goto err; ++ } ++ ++ imx6_pcie->sata_ref_100m = clk_get(&pdev->dev, "sata_ref_100m"); ++ if (IS_ERR(imx6_pcie->sata_ref_100m)) { ++ dev_err(&pdev->dev, ++ "sata_ref_100m clock source missing or invalid\n"); ++ ret = PTR_ERR(imx6_pcie->sata_ref_100m); ++ goto err; ++ } ++ ++ imx6_pcie->pcie_ref_125m = clk_get(&pdev->dev, "pcie_ref_125m"); ++ if (IS_ERR(imx6_pcie->pcie_ref_125m)) { ++ dev_err(&pdev->dev, ++ "pcie_ref_125m clock source missing or invalid\n"); ++ ret = PTR_ERR(imx6_pcie->pcie_ref_125m); ++ goto err; ++ } ++ ++ imx6_pcie->pcie_axi = clk_get(&pdev->dev, "pcie_axi"); ++ if (IS_ERR(imx6_pcie->pcie_axi)) { ++ dev_err(&pdev->dev, ++ "pcie_axi clock source missing or invalid\n"); ++ ret = PTR_ERR(imx6_pcie->pcie_axi); ++ 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 = imx6_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,imx6q-pcie", }, ++ {}, ++}; ++MODULE_DEVICE_TABLE(of, imx6_pcie_of_match); ++ ++static struct platform_driver imx6_pcie_driver = { ++ .driver = { ++ .name = "imx6q-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 imx6_init(void) ++{ ++ return platform_driver_probe(&imx6_pcie_driver, imx6_pcie_probe); ++} ++module_init(imx6_init); ++ ++MODULE_AUTHOR("Sean Cross <xobs@kosagi.com>"); ++MODULE_DESCRIPTION("Freescale i.MX6 PCIe host controller driver"); ++MODULE_LICENSE("GPL v2"); |