621 lines
16 KiB
Diff
621 lines
16 KiB
Diff
From bb38919ec56e0758c3ae56dfc091dcde1391353e Mon Sep 17 00:00:00 2001
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From: Sean Cross <xobs@kosagi.com>
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Date: Thu, 26 Sep 2013 11:24:47 +0800
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Subject: [PATCH] PCI: imx6: Add support for i.MX6 PCIe controller
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Add support for the PCIe port present on the i.MX6 family of controllers.
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These use the Synopsis Designware core tied to their own PHY.
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Signed-off-by: Sean Cross <xobs@kosagi.com>
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Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
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Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
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---
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drivers/pci/host/Kconfig | 6 +
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drivers/pci/host/Makefile | 1 +
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drivers/pci/host/pci-imx6.c | 575 +++++++++++++++++++++
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4 files changed, 588 insertions(+), 1 deletion(-)
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create mode 100644 drivers/pci/host/pci-imx6.c
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--- a/drivers/pci/host/Kconfig
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+++ b/drivers/pci/host/Kconfig
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@@ -15,6 +15,12 @@ config PCI_EXYNOS
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select PCIEPORTBUS
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select PCIE_DW
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+config PCI_IMX6
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+ bool "Freescale i.MX6 PCIe controller"
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+ depends on SOC_IMX6Q
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+ select PCIEPORTBUS
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+ select PCIE_DW
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+
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config PCI_TEGRA
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bool "NVIDIA Tegra PCIe controller"
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depends on ARCH_TEGRA
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--- a/drivers/pci/host/Makefile
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+++ b/drivers/pci/host/Makefile
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@@ -1,4 +1,5 @@
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obj-$(CONFIG_PCIE_DW) += pcie-designware.o
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obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
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+obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
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obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
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obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
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--- /dev/null
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+++ b/drivers/pci/host/pci-imx6.c
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@@ -0,0 +1,575 @@
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+/*
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+ * PCIe host controller driver for Freescale i.MX6 SoCs
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+ *
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+ * Copyright (C) 2013 Kosagi
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+ * http://www.kosagi.com
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+ *
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+ * Author: Sean Cross <xobs@kosagi.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/clk.h>
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+#include <linux/delay.h>
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+#include <linux/gpio.h>
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+#include <linux/kernel.h>
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+#include <linux/mfd/syscon.h>
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+#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
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+#include <linux/module.h>
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+#include <linux/of_gpio.h>
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+#include <linux/pci.h>
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+#include <linux/platform_device.h>
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+#include <linux/regmap.h>
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+#include <linux/resource.h>
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+#include <linux/signal.h>
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+#include <linux/types.h>
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+
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+#include "pcie-designware.h"
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+
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+#define to_imx6_pcie(x) container_of(x, struct imx6_pcie, pp)
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+
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+struct imx6_pcie {
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+ int reset_gpio;
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+ int power_on_gpio;
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+ int wake_up_gpio;
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+ int disable_gpio;
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+ struct clk *lvds_gate;
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+ struct clk *sata_ref_100m;
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+ struct clk *pcie_ref_125m;
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+ struct clk *pcie_axi;
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+ struct pcie_port pp;
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+ struct regmap *iomuxc_gpr;
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+ void __iomem *mem_base;
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+};
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+
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+/* PCIe Port Logic registers (memory-mapped) */
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+#define PL_OFFSET 0x700
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+#define PCIE_PHY_DEBUG_R0 (PL_OFFSET + 0x28)
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+#define PCIE_PHY_DEBUG_R1 (PL_OFFSET + 0x2c)
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+
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+#define PCIE_PHY_CTRL (PL_OFFSET + 0x114)
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+#define PCIE_PHY_CTRL_DATA_LOC 0
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+#define PCIE_PHY_CTRL_CAP_ADR_LOC 16
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+#define PCIE_PHY_CTRL_CAP_DAT_LOC 17
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+#define PCIE_PHY_CTRL_WR_LOC 18
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+#define PCIE_PHY_CTRL_RD_LOC 19
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+
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+#define PCIE_PHY_STAT (PL_OFFSET + 0x110)
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+#define PCIE_PHY_STAT_ACK_LOC 16
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+
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+/* PHY registers (not memory-mapped) */
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+#define PCIE_PHY_RX_ASIC_OUT 0x100D
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+
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+#define PHY_RX_OVRD_IN_LO 0x1005
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+#define PHY_RX_OVRD_IN_LO_RX_DATA_EN (1 << 5)
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+#define PHY_RX_OVRD_IN_LO_RX_PLL_EN (1 << 3)
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+
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+static int pcie_phy_poll_ack(void __iomem *dbi_base, int exp_val)
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+{
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+ u32 val;
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+ u32 max_iterations = 10;
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+ u32 wait_counter = 0;
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+
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+ do {
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+ val = readl(dbi_base + PCIE_PHY_STAT);
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+ val = (val >> PCIE_PHY_STAT_ACK_LOC) & 0x1;
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+ wait_counter++;
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+
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+ if (val == exp_val)
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+ return 0;
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+
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+ udelay(1);
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+ } while (wait_counter < max_iterations);
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+
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+ return -ETIMEDOUT;
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+}
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+
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+static int pcie_phy_wait_ack(void __iomem *dbi_base, int addr)
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+{
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+ u32 val;
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+ int ret;
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+
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+ val = addr << PCIE_PHY_CTRL_DATA_LOC;
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+ writel(val, dbi_base + PCIE_PHY_CTRL);
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+
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+ val |= (0x1 << PCIE_PHY_CTRL_CAP_ADR_LOC);
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+ writel(val, dbi_base + PCIE_PHY_CTRL);
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+
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+ ret = pcie_phy_poll_ack(dbi_base, 1);
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+ if (ret)
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+ return ret;
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+
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+ val = addr << PCIE_PHY_CTRL_DATA_LOC;
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+ writel(val, dbi_base + PCIE_PHY_CTRL);
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+
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+ ret = pcie_phy_poll_ack(dbi_base, 0);
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+ if (ret)
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+ return ret;
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+
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+ return 0;
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+}
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+
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+/* Read from the 16-bit PCIe PHY control registers (not memory-mapped) */
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+static int pcie_phy_read(void __iomem *dbi_base, int addr , int *data)
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+{
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+ u32 val, phy_ctl;
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+ int ret;
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+
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+ ret = pcie_phy_wait_ack(dbi_base, addr);
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+ if (ret)
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+ return ret;
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+
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+ /* assert Read signal */
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+ phy_ctl = 0x1 << PCIE_PHY_CTRL_RD_LOC;
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+ writel(phy_ctl, dbi_base + PCIE_PHY_CTRL);
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+
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+ ret = pcie_phy_poll_ack(dbi_base, 1);
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+ if (ret)
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+ return ret;
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+
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+ val = readl(dbi_base + PCIE_PHY_STAT);
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+ *data = val & 0xffff;
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+
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+ /* deassert Read signal */
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+ writel(0x00, dbi_base + PCIE_PHY_CTRL);
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+
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+ ret = pcie_phy_poll_ack(dbi_base, 0);
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+ if (ret)
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+ return ret;
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+
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+ return 0;
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+}
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+
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+static int pcie_phy_write(void __iomem *dbi_base, int addr, int data)
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+{
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+ u32 var;
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+ int ret;
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+
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+ /* write addr */
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+ /* cap addr */
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+ ret = pcie_phy_wait_ack(dbi_base, addr);
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+ if (ret)
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+ return ret;
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+
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+ var = data << PCIE_PHY_CTRL_DATA_LOC;
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+ writel(var, dbi_base + PCIE_PHY_CTRL);
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+
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+ /* capture data */
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+ var |= (0x1 << PCIE_PHY_CTRL_CAP_DAT_LOC);
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+ writel(var, dbi_base + PCIE_PHY_CTRL);
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+
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+ ret = pcie_phy_poll_ack(dbi_base, 1);
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+ if (ret)
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+ return ret;
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+
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+ /* deassert cap data */
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+ var = data << PCIE_PHY_CTRL_DATA_LOC;
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+ writel(var, dbi_base + PCIE_PHY_CTRL);
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+
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+ /* wait for ack de-assertion */
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+ ret = pcie_phy_poll_ack(dbi_base, 0);
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+ if (ret)
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+ return ret;
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+
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+ /* assert wr signal */
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+ var = 0x1 << PCIE_PHY_CTRL_WR_LOC;
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+ writel(var, dbi_base + PCIE_PHY_CTRL);
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+
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+ /* wait for ack */
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+ ret = pcie_phy_poll_ack(dbi_base, 1);
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+ if (ret)
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+ return ret;
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+
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+ /* deassert wr signal */
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+ var = data << PCIE_PHY_CTRL_DATA_LOC;
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+ writel(var, dbi_base + PCIE_PHY_CTRL);
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+
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+ /* wait for ack de-assertion */
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+ ret = pcie_phy_poll_ack(dbi_base, 0);
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+ if (ret)
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+ return ret;
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+
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+ writel(0x0, dbi_base + PCIE_PHY_CTRL);
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+
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+ return 0;
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+}
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+
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+/* Added for PCI abort handling */
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+static int imx6q_pcie_abort_handler(unsigned long addr,
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+ unsigned int fsr, struct pt_regs *regs)
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+{
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+ /*
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+ * If it was an imprecise abort, then we need to correct the
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+ * return address to be _after_ the instruction.
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+ */
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+ if (fsr & (1 << 10))
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+ regs->ARM_pc += 4;
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+ return 0;
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+}
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+
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+static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
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+{
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+ struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
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+
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
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+ IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
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+ IMX6Q_GPR12_PCIE_CTL_2, 1 << 10);
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
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+ IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
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+
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+ gpio_set_value(imx6_pcie->reset_gpio, 0);
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+ msleep(100);
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+ gpio_set_value(imx6_pcie->reset_gpio, 1);
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+
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+ return 0;
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+}
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+
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+static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
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+{
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+ struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
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+ int ret;
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+
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+ if (gpio_is_valid(imx6_pcie->power_on_gpio))
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+ gpio_set_value(imx6_pcie->power_on_gpio, 1);
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+
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
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+ IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
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+ IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
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+
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+ ret = clk_prepare_enable(imx6_pcie->sata_ref_100m);
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+ if (ret) {
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+ dev_err(pp->dev, "unable to enable sata_ref_100m\n");
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+ goto err_sata_ref;
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+ }
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+
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+ ret = clk_prepare_enable(imx6_pcie->pcie_ref_125m);
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+ if (ret) {
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+ dev_err(pp->dev, "unable to enable pcie_ref_125m\n");
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+ goto err_pcie_ref;
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+ }
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+
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+ ret = clk_prepare_enable(imx6_pcie->lvds_gate);
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+ if (ret) {
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+ dev_err(pp->dev, "unable to enable lvds_gate\n");
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+ goto err_lvds_gate;
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+ }
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+
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+ ret = clk_prepare_enable(imx6_pcie->pcie_axi);
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+ if (ret) {
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+ dev_err(pp->dev, "unable to enable pcie_axi\n");
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+ goto err_pcie_axi;
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+ }
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+
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+ /* allow the clocks to stabilize */
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+ usleep_range(200, 500);
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+
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+ return 0;
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+
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+err_pcie_axi:
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+ clk_disable_unprepare(imx6_pcie->lvds_gate);
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+err_lvds_gate:
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+ clk_disable_unprepare(imx6_pcie->pcie_ref_125m);
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+err_pcie_ref:
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+ clk_disable_unprepare(imx6_pcie->sata_ref_100m);
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+err_sata_ref:
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+ return ret;
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+
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+}
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+
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+static void imx6_pcie_init_phy(struct pcie_port *pp)
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+{
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+ struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
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+
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
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+ IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
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+
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+ /* configure constant input signal to the pcie ctrl and phy */
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
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+ IMX6Q_GPR12_DEVICE_TYPE, PCI_EXP_TYPE_ROOT_PORT << 12);
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
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+ IMX6Q_GPR12_LOS_LEVEL, 9 << 4);
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+
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
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+ IMX6Q_GPR8_TX_DEEMPH_GEN1, 0 << 0);
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
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+ IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB, 0 << 6);
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
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+ IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB, 20 << 12);
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
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+ IMX6Q_GPR8_TX_SWING_FULL, 127 << 18);
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
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+ IMX6Q_GPR8_TX_SWING_LOW, 127 << 25);
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+}
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+
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+static void imx6_pcie_host_init(struct pcie_port *pp)
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+{
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+ int count = 0;
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+ struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
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+
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+ imx6_pcie_assert_core_reset(pp);
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+
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+ imx6_pcie_init_phy(pp);
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+
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+ imx6_pcie_deassert_core_reset(pp);
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+
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+ dw_pcie_setup_rc(pp);
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+
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+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
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+ IMX6Q_GPR12_PCIE_CTL_2, 1 << 10);
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+
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+ while (!dw_pcie_link_up(pp)) {
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+ usleep_range(100, 1000);
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+ count++;
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+ if (count >= 10) {
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+ dev_err(pp->dev, "phy link never came up\n");
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+ dev_dbg(pp->dev,
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+ "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
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+ readl(pp->dbi_base + PCIE_PHY_DEBUG_R0),
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+ readl(pp->dbi_base + PCIE_PHY_DEBUG_R1));
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+ break;
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+ }
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+ }
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+
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+ return;
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+}
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+
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+static int imx6_pcie_link_up(struct pcie_port *pp)
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+{
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+ u32 rc, ltssm, rx_valid, temp;
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+
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+ /* link is debug bit 36, debug register 1 starts at bit 32 */
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+ rc = readl(pp->dbi_base + PCIE_PHY_DEBUG_R1) & (0x1 << (36 - 32));
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+ if (rc)
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+ return -EAGAIN;
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+
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+ /*
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+ * From L0, initiate MAC entry to gen2 if EP/RC supports gen2.
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+ * Wait 2ms (LTSSM timeout is 24ms, PHY lock is ~5us in gen2).
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+ * If (MAC/LTSSM.state == Recovery.RcvrLock)
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+ * && (PHY/rx_valid==0) then pulse PHY/rx_reset. Transition
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+ * to gen2 is stuck
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+ */
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+ pcie_phy_read(pp->dbi_base, PCIE_PHY_RX_ASIC_OUT, &rx_valid);
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+ ltssm = readl(pp->dbi_base + PCIE_PHY_DEBUG_R0) & 0x3F;
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+
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+ if (rx_valid & 0x01)
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+ return 0;
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+
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+ if (ltssm != 0x0d)
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+ return 0;
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+
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+ dev_err(pp->dev, "transition to gen2 is stuck, reset PHY!\n");
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+
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+ pcie_phy_read(pp->dbi_base,
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+ PHY_RX_OVRD_IN_LO, &temp);
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+ temp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN
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+ | PHY_RX_OVRD_IN_LO_RX_PLL_EN);
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+ pcie_phy_write(pp->dbi_base,
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+ PHY_RX_OVRD_IN_LO, temp);
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+
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+ usleep_range(2000, 3000);
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+
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+ pcie_phy_read(pp->dbi_base,
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+ PHY_RX_OVRD_IN_LO, &temp);
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+ temp &= ~(PHY_RX_OVRD_IN_LO_RX_DATA_EN
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+ | PHY_RX_OVRD_IN_LO_RX_PLL_EN);
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+ pcie_phy_write(pp->dbi_base,
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+ PHY_RX_OVRD_IN_LO, temp);
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+
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+ return 0;
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+}
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+
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+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 = devm_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 = devm_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 = devm_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 = devm_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_pcie_init(void)
|
|
+{
|
|
+ return platform_driver_probe(&imx6_pcie_driver, imx6_pcie_probe);
|
|
+}
|
|
+module_init(imx6_pcie_init);
|
|
+
|
|
+MODULE_AUTHOR("Sean Cross <xobs@kosagi.com>");
|
|
+MODULE_DESCRIPTION("Freescale i.MX6 PCIe host controller driver");
|
|
+MODULE_LICENSE("GPL v2");
|