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linux/drivers/pci/dwc/pci-imx6.c
Guenter Roeck c0464062bf PCI: dwc: Fix crashes seen due to missing assignments 
Fix the following crash, seen in dwc/pci-imx6.

  Unable to handle kernel NULL pointer dereference at virtual address 00000070
  pgd = c0004000
  [00000070] *pgd=00000000
  Internal error: Oops: 805 [#1] SMP ARM
  Modules linked in:
  CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.10.0-09686-g9e31489 #1
  Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
  task: cb850000 task.stack: cb84e000
  PC is at imx6_pcie_probe+0x2f4/0x414
  ...

While at it, fix the same problem in various drivers instead of waiting for
individual crash reports.

The change in the imx6 driver was tested with qemu. The changes in other
drivers are based on code inspection and have been compile tested only.

Fixes: 442ec4c04d ("PCI: dwc: all: Split struct pcie_port into host-only and core structures")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>  # designware-plat
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
2017-02-25 09:06:02 -06:00

737 lines
19 KiB
C
Raw Blame History

/*
* 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/of_device.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 <linux/interrupt.h>
#include "pcie-designware.h"
#define to_imx6_pcie(x) dev_get_drvdata((x)->dev)
enum imx6_pcie_variants {
IMX6Q,
IMX6SX,
IMX6QP,
};
struct imx6_pcie {
struct dw_pcie *pci;
int reset_gpio;
bool gpio_active_high;
struct clk *pcie_bus;
struct clk *pcie_phy;
struct clk *pcie_inbound_axi;
struct clk *pcie;
struct regmap *iomuxc_gpr;
enum imx6_pcie_variants variant;
u32 tx_deemph_gen1;
u32 tx_deemph_gen2_3p5db;
u32 tx_deemph_gen2_6db;
u32 tx_swing_full;
u32 tx_swing_low;
int link_gen;
};
/* PCIe Root Complex registers (memory-mapped) */
#define PCIE_RC_LCR 0x7c
#define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1 0x1
#define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN2 0x2
#define PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK 0xf
#define PCIE_RC_LCSR 0x80
/* PCIe Port Logic registers (memory-mapped) */
#define PL_OFFSET 0x700
#define PCIE_PL_PFLR (PL_OFFSET + 0x08)
#define PCIE_PL_PFLR_LINK_STATE_MASK (0x3f << 16)
#define PCIE_PL_PFLR_FORCE_LINK (1 << 15)
#define PCIE_PHY_DEBUG_R0 (PL_OFFSET + 0x28)
#define PCIE_PHY_DEBUG_R1 (PL_OFFSET + 0x2c)
#define PCIE_PHY_DEBUG_R1_XMLH_LINK_IN_TRAINING (1 << 29)
#define PCIE_PHY_DEBUG_R1_XMLH_LINK_UP (1 << 4)
#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
#define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
#define PORT_LOGIC_SPEED_CHANGE (0x1 << 17)
/* PHY registers (not memory-mapped) */
#define PCIE_PHY_RX_ASIC_OUT 0x100D
#define PCIE_PHY_RX_ASIC_OUT_VALID (1 << 0)
#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(struct imx6_pcie *imx6_pcie, int exp_val)
{
struct dw_pcie *pci = imx6_pcie->pci;
u32 val;
u32 max_iterations = 10;
u32 wait_counter = 0;
do {
val = dw_pcie_readl_dbi(pci, 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);
return -ETIMEDOUT;
}
static int pcie_phy_wait_ack(struct imx6_pcie *imx6_pcie, int addr)
{
struct dw_pcie *pci = imx6_pcie->pci;
u32 val;
int ret;
val = addr << PCIE_PHY_CTRL_DATA_LOC;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
val |= (0x1 << PCIE_PHY_CTRL_CAP_ADR_LOC);
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
ret = pcie_phy_poll_ack(imx6_pcie, 1);
if (ret)
return ret;
val = addr << PCIE_PHY_CTRL_DATA_LOC;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
return pcie_phy_poll_ack(imx6_pcie, 0);
}
/* Read from the 16-bit PCIe PHY control registers (not memory-mapped) */
static int pcie_phy_read(struct imx6_pcie *imx6_pcie, int addr, int *data)
{
struct dw_pcie *pci = imx6_pcie->pci;
u32 val, phy_ctl;
int ret;
ret = pcie_phy_wait_ack(imx6_pcie, addr);
if (ret)
return ret;
/* assert Read signal */
phy_ctl = 0x1 << PCIE_PHY_CTRL_RD_LOC;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, phy_ctl);
ret = pcie_phy_poll_ack(imx6_pcie, 1);
if (ret)
return ret;
val = dw_pcie_readl_dbi(pci, PCIE_PHY_STAT);
*data = val & 0xffff;
/* deassert Read signal */
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, 0x00);
return pcie_phy_poll_ack(imx6_pcie, 0);
}
static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, int data)
{
struct dw_pcie *pci = imx6_pcie->pci;
u32 var;
int ret;
/* write addr */
/* cap addr */
ret = pcie_phy_wait_ack(imx6_pcie, addr);
if (ret)
return ret;
var = data << PCIE_PHY_CTRL_DATA_LOC;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
/* capture data */
var |= (0x1 << PCIE_PHY_CTRL_CAP_DAT_LOC);
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
ret = pcie_phy_poll_ack(imx6_pcie, 1);
if (ret)
return ret;
/* deassert cap data */
var = data << PCIE_PHY_CTRL_DATA_LOC;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
/* wait for ack de-assertion */
ret = pcie_phy_poll_ack(imx6_pcie, 0);
if (ret)
return ret;
/* assert wr signal */
var = 0x1 << PCIE_PHY_CTRL_WR_LOC;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
/* wait for ack */
ret = pcie_phy_poll_ack(imx6_pcie, 1);
if (ret)
return ret;
/* deassert wr signal */
var = data << PCIE_PHY_CTRL_DATA_LOC;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
/* wait for ack de-assertion */
ret = pcie_phy_poll_ack(imx6_pcie, 0);
if (ret)
return ret;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, 0x0);
return 0;
}
static void imx6_pcie_reset_phy(struct imx6_pcie *imx6_pcie)
{
u32 tmp;
pcie_phy_read(imx6_pcie, PHY_RX_OVRD_IN_LO, &tmp);
tmp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN |
PHY_RX_OVRD_IN_LO_RX_PLL_EN);
pcie_phy_write(imx6_pcie, PHY_RX_OVRD_IN_LO, tmp);
usleep_range(2000, 3000);
pcie_phy_read(imx6_pcie, PHY_RX_OVRD_IN_LO, &tmp);
tmp &= ~(PHY_RX_OVRD_IN_LO_RX_DATA_EN |
PHY_RX_OVRD_IN_LO_RX_PLL_EN);
pcie_phy_write(imx6_pcie, PHY_RX_OVRD_IN_LO, tmp);
}
/* Added for PCI abort handling */
static int imx6q_pcie_abort_handler(unsigned long addr,
unsigned int fsr, struct pt_regs *regs)
{
return 0;
}
static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
{
switch (imx6_pcie->variant) {
case IMX6SX:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
/* Force PCIe PHY reset */
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
IMX6SX_GPR5_PCIE_BTNRST_RESET,
IMX6SX_GPR5_PCIE_BTNRST_RESET);
break;
case IMX6QP:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
IMX6Q_GPR1_PCIE_SW_RST,
IMX6Q_GPR1_PCIE_SW_RST);
break;
case IMX6Q:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
break;
}
}
static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
{
struct dw_pcie *pci = imx6_pcie->pci;
struct device *dev = pci->dev;
int ret = 0;
switch (imx6_pcie->variant) {
case IMX6SX:
ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
if (ret) {
dev_err(dev, "unable to enable pcie_axi clock\n");
break;
}
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
break;
case IMX6QP: /* FALLTHROUGH */
case IMX6Q:
/* power up core phy and enable ref clock */
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
/*
* the async reset input need ref clock to sync internally,
* when the ref clock comes after reset, internal synced
* reset time is too short, cannot meet the requirement.
* add one ~10us delay here.
*/
udelay(10);
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
break;
}
return ret;
}
static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
{
struct dw_pcie *pci = imx6_pcie->pci;
struct device *dev = pci->dev;
int ret;
ret = clk_prepare_enable(imx6_pcie->pcie_phy);
if (ret) {
dev_err(dev, "unable to enable pcie_phy clock\n");
return;
}
ret = clk_prepare_enable(imx6_pcie->pcie_bus);
if (ret) {
dev_err(dev, "unable to enable pcie_bus clock\n");
goto err_pcie_bus;
}
ret = clk_prepare_enable(imx6_pcie->pcie);
if (ret) {
dev_err(dev, "unable to enable pcie clock\n");
goto err_pcie;
}
ret = imx6_pcie_enable_ref_clk(imx6_pcie);
if (ret) {
dev_err(dev, "unable to enable pcie ref clock\n");
goto err_ref_clk;
}
/* allow the clocks to stabilize */
usleep_range(200, 500);
/* Some boards don't have PCIe reset GPIO. */
if (gpio_is_valid(imx6_pcie->reset_gpio)) {
gpio_set_value_cansleep(imx6_pcie->reset_gpio,
imx6_pcie->gpio_active_high);
msleep(100);
gpio_set_value_cansleep(imx6_pcie->reset_gpio,
!imx6_pcie->gpio_active_high);
}
switch (imx6_pcie->variant) {
case IMX6SX:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
break;
case IMX6QP:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
IMX6Q_GPR1_PCIE_SW_RST, 0);
usleep_range(200, 500);
break;
case IMX6Q: /* Nothing to do */
break;
}
return;
err_ref_clk:
clk_disable_unprepare(imx6_pcie->pcie);
err_pcie:
clk_disable_unprepare(imx6_pcie->pcie_bus);
err_pcie_bus:
clk_disable_unprepare(imx6_pcie->pcie_phy);
}
static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
{
if (imx6_pcie->variant == IMX6SX)
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6SX_GPR12_PCIE_RX_EQ_MASK,
IMX6SX_GPR12_PCIE_RX_EQ_2);
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,
imx6_pcie->tx_deemph_gen1 << 0);
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB,
imx6_pcie->tx_deemph_gen2_3p5db << 6);
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB,
imx6_pcie->tx_deemph_gen2_6db << 12);
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
IMX6Q_GPR8_TX_SWING_FULL,
imx6_pcie->tx_swing_full << 18);
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
IMX6Q_GPR8_TX_SWING_LOW,
imx6_pcie->tx_swing_low << 25);
}
static int imx6_pcie_wait_for_link(struct imx6_pcie *imx6_pcie)
{
struct dw_pcie *pci = imx6_pcie->pci;
struct device *dev = pci->dev;
/* check if the link is up or not */
if (!dw_pcie_wait_for_link(pci))
return 0;
dev_dbg(dev, "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R0),
dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R1));
return -ETIMEDOUT;
}
static int imx6_pcie_wait_for_speed_change(struct imx6_pcie *imx6_pcie)
{
struct dw_pcie *pci = imx6_pcie->pci;
struct device *dev = pci->dev;
u32 tmp;
unsigned int retries;
for (retries = 0; retries < 200; retries++) {
tmp = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
/* Test if the speed change finished. */
if (!(tmp & PORT_LOGIC_SPEED_CHANGE))
return 0;
usleep_range(100, 1000);
}
dev_err(dev, "Speed change timeout\n");
return -EINVAL;
}
static irqreturn_t imx6_pcie_msi_handler(int irq, void *arg)
{
struct imx6_pcie *imx6_pcie = arg;
struct dw_pcie *pci = imx6_pcie->pci;
struct pcie_port *pp = &pci->pp;
return dw_handle_msi_irq(pp);
}
static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
{
struct dw_pcie *pci = imx6_pcie->pci;
struct device *dev = pci->dev;
u32 tmp;
int ret;
/*
* Force Gen1 operation when starting the link. In case the link is
* started in Gen2 mode, there is a possibility the devices on the
* bus will not be detected at all. This happens with PCIe switches.
*/
tmp = dw_pcie_readl_dbi(pci, PCIE_RC_LCR);
tmp &= ~PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK;
tmp |= PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1;
dw_pcie_writel_dbi(pci, PCIE_RC_LCR, tmp);
/* Start LTSSM. */
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6Q_GPR12_PCIE_CTL_2, 1 << 10);
ret = imx6_pcie_wait_for_link(imx6_pcie);
if (ret)
goto err_reset_phy;
if (imx6_pcie->link_gen == 2) {
/* Allow Gen2 mode after the link is up. */
tmp = dw_pcie_readl_dbi(pci, PCIE_RC_LCR);
tmp &= ~PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK;
tmp |= PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN2;
dw_pcie_writel_dbi(pci, PCIE_RC_LCR, tmp);
} else {
dev_info(dev, "Link: Gen2 disabled\n");
}
/*
* Start Directed Speed Change so the best possible speed both link
* partners support can be negotiated.
*/
tmp = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
tmp |= PORT_LOGIC_SPEED_CHANGE;
dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, tmp);
ret = imx6_pcie_wait_for_speed_change(imx6_pcie);
if (ret) {
dev_err(dev, "Failed to bring link up!\n");
goto err_reset_phy;
}
/* Make sure link training is finished as well! */
ret = imx6_pcie_wait_for_link(imx6_pcie);
if (ret) {
dev_err(dev, "Failed to bring link up!\n");
goto err_reset_phy;
}
tmp = dw_pcie_readl_dbi(pci, PCIE_RC_LCSR);
dev_info(dev, "Link up, Gen%i\n", (tmp >> 16) & 0xf);
return 0;
err_reset_phy:
dev_dbg(dev, "PHY DEBUG_R0=0x%08x DEBUG_R1=0x%08x\n",
dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R0),
dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R1));
imx6_pcie_reset_phy(imx6_pcie);
return ret;
}
static void imx6_pcie_host_init(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
imx6_pcie_assert_core_reset(imx6_pcie);
imx6_pcie_init_phy(imx6_pcie);
imx6_pcie_deassert_core_reset(imx6_pcie);
dw_pcie_setup_rc(pp);
imx6_pcie_establish_link(imx6_pcie);
if (IS_ENABLED(CONFIG_PCI_MSI))
dw_pcie_msi_init(pp);
}
static int imx6_pcie_link_up(struct dw_pcie *pci)
{
return dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R1) &
PCIE_PHY_DEBUG_R1_XMLH_LINK_UP;
}
static struct dw_pcie_host_ops imx6_pcie_host_ops = {
.host_init = imx6_pcie_host_init,
};
static int __init imx6_add_pcie_port(struct imx6_pcie *imx6_pcie,
struct platform_device *pdev)
{
struct dw_pcie *pci = imx6_pcie->pci;
struct pcie_port *pp = &pci->pp;
struct device *dev = &pdev->dev;
int ret;
if (IS_ENABLED(CONFIG_PCI_MSI)) {
pp->msi_irq = platform_get_irq_byname(pdev, "msi");
if (pp->msi_irq <= 0) {
dev_err(dev, "failed to get MSI irq\n");
return -ENODEV;
}
ret = devm_request_irq(dev, pp->msi_irq,
imx6_pcie_msi_handler,
IRQF_SHARED | IRQF_NO_THREAD,
"mx6-pcie-msi", imx6_pcie);
if (ret) {
dev_err(dev, "failed to request MSI irq\n");
return ret;
}
}
pp->root_bus_nr = -1;
pp->ops = &imx6_pcie_host_ops;
ret = dw_pcie_host_init(pp);
if (ret) {
dev_err(dev, "failed to initialize host\n");
return ret;
}
return 0;
}
static const struct dw_pcie_ops dw_pcie_ops = {
.link_up = imx6_pcie_link_up,
};
static int __init imx6_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct dw_pcie *pci;
struct imx6_pcie *imx6_pcie;
struct resource *dbi_base;
struct device_node *node = dev->of_node;
int ret;
imx6_pcie = devm_kzalloc(dev, sizeof(*imx6_pcie), GFP_KERNEL);
if (!imx6_pcie)
return -ENOMEM;
pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
if (!pci)
return -ENOMEM;
pci->dev = dev;
pci->ops = &dw_pcie_ops;
imx6_pcie->pci = pci;
imx6_pcie->variant =
(enum imx6_pcie_variants)of_device_get_match_data(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);
pci->dbi_base = devm_ioremap_resource(dev, dbi_base);
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);
/* Fetch GPIOs */
imx6_pcie->reset_gpio = of_get_named_gpio(node, "reset-gpio", 0);
imx6_pcie->gpio_active_high = of_property_read_bool(node,
"reset-gpio-active-high");
if (gpio_is_valid(imx6_pcie->reset_gpio)) {
ret = devm_gpio_request_one(dev, imx6_pcie->reset_gpio,
imx6_pcie->gpio_active_high ?
GPIOF_OUT_INIT_HIGH :
GPIOF_OUT_INIT_LOW,
"PCIe reset");
if (ret) {
dev_err(dev, "unable to get reset gpio\n");
return ret;
}
}
/* Fetch clocks */
imx6_pcie->pcie_phy = devm_clk_get(dev, "pcie_phy");
if (IS_ERR(imx6_pcie->pcie_phy)) {
dev_err(dev, "pcie_phy clock source missing or invalid\n");
return PTR_ERR(imx6_pcie->pcie_phy);
}
imx6_pcie->pcie_bus = devm_clk_get(dev, "pcie_bus");
if (IS_ERR(imx6_pcie->pcie_bus)) {
dev_err(dev, "pcie_bus clock source missing or invalid\n");
return PTR_ERR(imx6_pcie->pcie_bus);
}
imx6_pcie->pcie = devm_clk_get(dev, "pcie");
if (IS_ERR(imx6_pcie->pcie)) {
dev_err(dev, "pcie clock source missing or invalid\n");
return PTR_ERR(imx6_pcie->pcie);
}
if (imx6_pcie->variant == IMX6SX) {
imx6_pcie->pcie_inbound_axi = devm_clk_get(dev,
"pcie_inbound_axi");
if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
dev_err(dev, "pcie_inbound_axi clock missing or invalid\n");
return PTR_ERR(imx6_pcie->pcie_inbound_axi);
}
}
/* 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(dev, "unable to find iomuxc registers\n");
return PTR_ERR(imx6_pcie->iomuxc_gpr);
}
/* Grab PCIe PHY Tx Settings */
if (of_property_read_u32(node, "fsl,tx-deemph-gen1",
&imx6_pcie->tx_deemph_gen1))
imx6_pcie->tx_deemph_gen1 = 0;
if (of_property_read_u32(node, "fsl,tx-deemph-gen2-3p5db",
&imx6_pcie->tx_deemph_gen2_3p5db))
imx6_pcie->tx_deemph_gen2_3p5db = 0;
if (of_property_read_u32(node, "fsl,tx-deemph-gen2-6db",
&imx6_pcie->tx_deemph_gen2_6db))
imx6_pcie->tx_deemph_gen2_6db = 20;
if (of_property_read_u32(node, "fsl,tx-swing-full",
&imx6_pcie->tx_swing_full))
imx6_pcie->tx_swing_full = 127;
if (of_property_read_u32(node, "fsl,tx-swing-low",
&imx6_pcie->tx_swing_low))
imx6_pcie->tx_swing_low = 127;
/* Limit link speed */
ret = of_property_read_u32(node, "fsl,max-link-speed",
&imx6_pcie->link_gen);
if (ret)
imx6_pcie->link_gen = 1;
platform_set_drvdata(pdev, imx6_pcie);
ret = imx6_add_pcie_port(imx6_pcie, pdev);
if (ret < 0)
return ret;
return 0;
}
static void imx6_pcie_shutdown(struct platform_device *pdev)
{
struct imx6_pcie *imx6_pcie = platform_get_drvdata(pdev);
/* bring down link, so bootloader gets clean state in case of reboot */
imx6_pcie_assert_core_reset(imx6_pcie);
}
static const struct of_device_id imx6_pcie_of_match[] = {
{ .compatible = "fsl,imx6q-pcie", .data = (void *)IMX6Q, },
{ .compatible = "fsl,imx6sx-pcie", .data = (void *)IMX6SX, },
{ .compatible = "fsl,imx6qp-pcie", .data = (void *)IMX6QP, },
{},
};
static struct platform_driver imx6_pcie_driver = {
.driver = {
.name = "imx6q-pcie",
.of_match_table = imx6_pcie_of_match,
},
.shutdown = imx6_pcie_shutdown,
};
static int __init imx6_pcie_init(void)
{
return platform_driver_probe(&imx6_pcie_driver, imx6_pcie_probe);
}
device_initcall(imx6_pcie_init);
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