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alistair23-linux/drivers/pci/controller/dwc/pci-imx6.c

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// SPDX-License-Identifier: GPL-2.0
/*
* PCIe host controller driver for Freescale i.MX6 SoCs
*
* Copyright (C) 2013 Kosagi
* http://www.kosagi.com
*
* Author: Sean Cross <xobs@kosagi.com>
*/
#include <dt-bindings/soc/imx8_hsio.h>
#include <linux/bitfield.h>
#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/mfd/syscon/imx7-iomuxc-gpr.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/resource.h>
#include <linux/signal.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/reset.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include "../../pci.h"
#include "pcie-designware.h"
#define IMX8MQ_PCIE_LINK_CAP_REG_OFFSET 0x7c
#define IMX8MQ_PCIE_LINK_CAP_L1EL_64US (BIT(18) | BIT(17))
#define IMX8MQ_PCIE_L1SUB_CTRL1_REG_EN_MASK 0xf
#define IMX8MQ_GPR_PCIE_REF_USE_PAD BIT(9)
#define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN BIT(10)
#define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE BIT(11)
#define IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE GENMASK(11, 8)
#define IMX8MQ_PCIE2_BASE_ADDR 0x33c00000
#define IMX8_HSIO_PCIEB_BASE_ADDR 0x5f010000
#define to_imx6_pcie(x) dev_get_drvdata((x)->dev)
enum imx6_pcie_variants {
IMX6Q,
IMX6SX,
IMX6QP,
IMX7D,
IMX8MQ,
IMX8MM,
IMX8QM,
IMX8QXP,
};
#define IMX6_PCIE_FLAG_IMX6_PHY BIT(0)
#define IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE BIT(1)
#define IMX6_PCIE_FLAG_SUPPORTS_SUSPEND BIT(2)
#define IMX6_PCIE_FLAG_IMX6_CPU_ADDR_FIXUP BIT(3)
#define IMX6_PCIE_FLAG_SUPPORTS_L1SS BIT(4)
struct imx6_pcie_drvdata {
enum imx6_pcie_variants variant;
u32 flags;
int dbi_length;
};
struct imx6_pcie {
struct dw_pcie *pci;
int clkreq_gpio;
int dis_gpio;
int reset_gpio;
bool gpio_active_high;
struct clk *pcie_bus;
struct clk *pcie_phy;
struct clk *pcie_per;
struct clk *pcie_inbound_axi;
struct clk *pcie;
struct clk *pcie_aux;
struct clk *phy_per;
struct clk *misc_per;
struct regmap *iomuxc_gpr;
u32 controller_id;
struct reset_control *pciephy_reset;
struct reset_control *apps_reset;
struct reset_control *turnoff_reset;
struct reset_control *clkreq_reset;
u32 tx_deemph_gen1;
u32 tx_deemph_gen2_3p5db;
u32 tx_deemph_gen2_6db;
u32 tx_swing_full;
u32 tx_swing_low;
u32 hsio_cfg;
u32 ext_osc;
u32 local_addr;
u32 hard_wired;
u32 dma_unroll_offset;
int link_gen;
struct regulator *vpcie;
void __iomem *phy_base;
/* power domain for pcie */
struct device *pd_pcie;
/* power domain for pcie phy */
struct device *pd_pcie_phy;
/* power domain for hsio gpio used by pcie */
struct device *pd_hsio_gpio;
const struct imx6_pcie_drvdata *drvdata;
struct regulator *epdev_on;
};
/* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */
#define PHY_PLL_LOCK_WAIT_MAX_RETRIES 2000
#define PHY_PLL_LOCK_WAIT_USLEEP_MIN 50
#define PHY_PLL_LOCK_WAIT_USLEEP_MAX 200
#define PHY_PLL_LOCK_WAIT_TIMEOUT (2000 * PHY_PLL_LOCK_WAIT_USLEEP_MAX)
/* PCIe Root Complex registers (memory-mapped) */
#define PCIE_RC_IMX6_MSI_CAP 0x50
#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_PHY_DEBUG_R1 (PL_OFFSET + 0x2c)
#define PCIE_PHY_CTRL (PL_OFFSET + 0x114)
#define PCIE_PHY_CTRL_DATA(x) FIELD_PREP(GENMASK(15, 0), (x))
#define PCIE_PHY_CTRL_CAP_ADR BIT(16)
#define PCIE_PHY_CTRL_CAP_DAT BIT(17)
#define PCIE_PHY_CTRL_WR BIT(18)
#define PCIE_PHY_CTRL_RD BIT(19)
#define PCIE_PHY_STAT (PL_OFFSET + 0x110)
#define PCIE_PHY_STAT_ACK BIT(16)
#define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
/* DMA registers */
#define MAX_PCIE_DMA_CHANNELS 8
#define DMA_UNROLL_CDM_OFFSET (0x7 << 19)
#define DMA_REG_OFFSET 0x970
#define DMA_CTRL_VIEWPORT_OFF (DMA_REG_OFFSET + 0x8)
#define DMA_WRITE_ENGINE_EN_OFF (DMA_REG_OFFSET + 0xC)
#define DMA_WRITE_ENGINE_EN BIT(0)
#define DMA_WRITE_DOORBELL (DMA_REG_OFFSET + 0x10)
#define DMA_READ_ENGINE_EN_OFF (DMA_REG_OFFSET + 0x2C)
#define DMA_READ_ENGINE_EN BIT(0)
#define DMA_READ_DOORBELL (DMA_REG_OFFSET + 0x30)
#define DMA_WRITE_INT_STS (DMA_REG_OFFSET + 0x4C)
#define DMA_WRITE_INT_MASK (DMA_REG_OFFSET + 0x54)
#define DMA_WRITE_INT_CLR (DMA_REG_OFFSET + 0x58)
#define DMA_READ_INT_STS (DMA_REG_OFFSET + 0xA0)
#define DMA_READ_INT_MASK (DMA_REG_OFFSET + 0xA8)
#define DMA_READ_INT_CLR (DMA_REG_OFFSET + 0xAC)
#define DMA_DONE_INT_STS 0xFF
#define DMA_ABORT_INT_STS (0xFF << 16)
#define DMA_VIEWPOT_SEL_OFF (DMA_REG_OFFSET + 0xFC)
#define DMA_CHANNEL_CTRL_1 (DMA_REG_OFFSET + 0x100)
#define DMA_CHANNEL_CTRL_1_LIE BIT(3)
#define DMA_CHANNEL_CTRL_2 (DMA_REG_OFFSET + 0x104)
#define DMA_TRANSFER_SIZE (DMA_REG_OFFSET + 0x108)
#define DMA_SAR_LOW (DMA_REG_OFFSET + 0x10C)
#define DMA_SAR_HIGH (DMA_REG_OFFSET + 0x110)
#define DMA_DAR_LOW (DMA_REG_OFFSET + 0x114)
#define DMA_DAR_HIGH (DMA_REG_OFFSET + 0x118)
/* PHY registers (not memory-mapped) */
#define PCIE_PHY_ATEOVRD 0x10
#define PCIE_PHY_ATEOVRD_EN BIT(2)
#define PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT 0
#define PCIE_PHY_ATEOVRD_REF_CLKDIV_MASK 0x1
#define PCIE_PHY_MPLL_OVRD_IN_LO 0x11
#define PCIE_PHY_MPLL_MULTIPLIER_SHIFT 2
#define PCIE_PHY_MPLL_MULTIPLIER_MASK 0x7f
#define PCIE_PHY_MPLL_MULTIPLIER_OVRD BIT(9)
#define PCIE_PHY_RX_ASIC_OUT 0x100D
#define PCIE_PHY_RX_ASIC_OUT_VALID (1 << 0)
/* iMX7 PCIe PHY registers */
#define PCIE_PHY_CMN_REG4 0x14
/* These are probably the bits that *aren't* DCC_FB_EN */
#define PCIE_PHY_CMN_REG4_DCC_FB_EN 0x29
#define PCIE_PHY_CMN_REG15 0x54
#define PCIE_PHY_CMN_REG15_DLY_4 BIT(2)
#define PCIE_PHY_CMN_REG15_PLL_PD BIT(5)
#define PCIE_PHY_CMN_REG15_OVRD_PLL_PD BIT(7)
#define PCIE_PHY_CMN_REG24 0x90
#define PCIE_PHY_CMN_REG24_RX_EQ BIT(6)
#define PCIE_PHY_CMN_REG24_RX_EQ_SEL BIT(3)
#define PCIE_PHY_CMN_REG26 0x98
#define PCIE_PHY_CMN_REG26_ATT_MODE 0xBC
#define PCIE_PHY_CMN_REG62 0x188
#define PCIE_PHY_CMN_REG62_PLL_CLK_OUT 0x08
#define PCIE_PHY_CMN_REG64 0x190
#define PCIE_PHY_CMN_REG64_AUX_RX_TX_TERM 0x8C
#define PCIE_PHY_CMN_REG75 0x1D4
#define PCIE_PHY_CMN_REG75_PLL_DONE 0x3
#define PCIE_PHY_TRSV_REG5 0x414
#define PCIE_PHY_TRSV_REG5_GEN1_DEEMP 0x2D
#define PCIE_PHY_TRSV_REG6 0x418
#define PCIE_PHY_TRSV_REG6_GEN2_DEEMP 0xF
#define PHY_RX_OVRD_IN_LO 0x1005
#define PHY_RX_OVRD_IN_LO_RX_DATA_EN BIT(5)
#define PHY_RX_OVRD_IN_LO_RX_PLL_EN BIT(3)
/* iMX8 HSIO registers */
#define IMX8QM_CSR_PHYX2_OFFSET 0x00000
#define IMX8QM_CSR_PHYX1_OFFSET 0x10000
#define IMX8QM_CSR_PHYX_STTS0_OFFSET 0x4
#define IMX8QM_CSR_PCIEA_OFFSET 0x20000
#define IMX8QM_CSR_PCIEB_OFFSET 0x30000
#define IMX8QM_CSR_PCIE_CTRL1_OFFSET 0x4
#define IMX8QM_CSR_PCIE_CTRL2_OFFSET 0x8
#define IMX8QM_CSR_PCIE_STTS0_OFFSET 0xC
#define IMX8QM_CSR_MISC_OFFSET 0x50000
#define IMX8QM_CTRL_LTSSM_ENABLE BIT(4)
#define IMX8QM_CTRL_READY_ENTR_L23 BIT(5)
#define IMX8QM_CTRL_PM_XMT_TURNOFF BIT(9)
#define IMX8QM_CTRL_BUTTON_RST_N BIT(21)
#define IMX8QM_CTRL_PERST_N BIT(22)
#define IMX8QM_CTRL_POWER_UP_RST_N BIT(23)
#define IMX8QM_CTRL_STTS0_PM_LINKST_IN_L2 BIT(13)
#define IMX8QM_CTRL_STTS0_PM_REQ_CORE_RST BIT(19)
#define IMX8QM_STTS0_LANE0_TX_PLL_LOCK BIT(4)
#define IMX8QM_STTS0_LANE1_TX_PLL_LOCK BIT(12)
#define IMX8QM_PCIE_TYPE_MASK (0xF << 24)
#define IMX8QM_PHYX2_CTRL0_APB_MASK 0x3
#define IMX8QM_PHY_APB_RSTN_0 BIT(0)
#define IMX8QM_PHY_APB_RSTN_1 BIT(1)
#define IMX8QM_MISC_IOB_RXENA BIT(0)
#define IMX8QM_MISC_IOB_TXENA BIT(1)
#define IMX8QM_CSR_MISC_IOB_A_0_TXOE BIT(2)
#define IMX8QM_CSR_MISC_IOB_A_0_M1M0_MASK (0x3 << 3)
#define IMX8QM_CSR_MISC_IOB_A_0_M1M0_2 BIT(4)
#define IMX8QM_MISC_PHYX1_EPCS_SEL BIT(12)
#define IMX8QM_MISC_PCIE_AB_SELECT BIT(13)
#define IMX8MM_GPR_PCIE_REF_CLK_SEL (0x3 << 24)
#define IMX8MM_GPR_PCIE_REF_CLK_PLL (0x3 << 24)
#define IMX8MM_GPR_PCIE_REF_CLK_EXT (0x2 << 24)
#define IMX8MM_GPR_PCIE_AUX_EN BIT(19)
#define IMX8MM_GPR_PCIE_CMN_RST BIT(18)
#define IMX8MM_GPR_PCIE_POWER_OFF BIT(17)
#define IMX8MM_GPR_PCIE_SSC_EN BIT(16)
/*
* The default value of the reserved ddr memory
* used to verify EP/RC memory space access operations.
* The layout of the 1G ddr on SD boards
* [imx6qdl-sd-ard boards]0x1000_0000 ~ 0x4FFF_FFFF
* [imx6sx,imx7d platforms]0x8000_0000 ~ 0xBFFF_FFFF
*
*/
static u32 ddr_test_region = 0, test_region_size = SZ_2M;
static bool dma_w_end, dma_r_end, dma_en;
static bool imx6_pcie_readable_reg(struct device *dev, unsigned int reg)
{
enum imx6_pcie_variants variant;
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
variant = imx6_pcie->drvdata->variant;
if (variant == IMX8QXP) {
switch (reg) {
case IMX8QM_CSR_PHYX1_OFFSET:
case IMX8QM_CSR_PCIEB_OFFSET:
case IMX8QM_CSR_MISC_OFFSET:
case IMX8QM_CSR_PHYX1_OFFSET + IMX8QM_CSR_PHYX_STTS0_OFFSET:
case IMX8QM_CSR_PCIEB_OFFSET + IMX8QM_CSR_PCIE_CTRL1_OFFSET:
case IMX8QM_CSR_PCIEB_OFFSET + IMX8QM_CSR_PCIE_CTRL2_OFFSET:
case IMX8QM_CSR_PCIEB_OFFSET + IMX8QM_CSR_PCIE_STTS0_OFFSET:
return true;
default:
return false;
}
} else {
switch (reg) {
case IMX8QM_CSR_PHYX2_OFFSET:
case IMX8QM_CSR_PCIEA_OFFSET:
case IMX8QM_CSR_MISC_OFFSET:
case IMX8QM_CSR_PHYX2_OFFSET + IMX8QM_CSR_PHYX_STTS0_OFFSET:
case IMX8QM_CSR_PCIEA_OFFSET + IMX8QM_CSR_PCIE_CTRL1_OFFSET:
case IMX8QM_CSR_PCIEA_OFFSET + IMX8QM_CSR_PCIE_CTRL2_OFFSET:
case IMX8QM_CSR_PCIEA_OFFSET + IMX8QM_CSR_PCIE_STTS0_OFFSET:
return true;
default:
return false;
}
}
}
static bool imx6_pcie_writeable_reg(struct device *dev, unsigned int reg)
{
enum imx6_pcie_variants variant;
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
variant = imx6_pcie->drvdata->variant;
if (variant == IMX8QXP) {
switch (reg) {
case IMX8QM_CSR_PHYX1_OFFSET:
case IMX8QM_CSR_PCIEB_OFFSET:
case IMX8QM_CSR_MISC_OFFSET:
case IMX8QM_CSR_PCIEB_OFFSET + IMX8QM_CSR_PCIE_CTRL1_OFFSET:
case IMX8QM_CSR_PCIEB_OFFSET + IMX8QM_CSR_PCIE_CTRL2_OFFSET:
return true;
default:
return false;
}
} else {
switch (reg) {
case IMX8QM_CSR_PHYX2_OFFSET:
case IMX8QM_CSR_PCIEA_OFFSET:
case IMX8QM_CSR_MISC_OFFSET:
case IMX8QM_CSR_PCIEA_OFFSET + IMX8QM_CSR_PCIE_CTRL1_OFFSET:
case IMX8QM_CSR_PCIEA_OFFSET + IMX8QM_CSR_PCIE_CTRL2_OFFSET:
return true;
default:
return false;
}
}
}
static const struct regmap_config imx6_pcie_regconfig = {
.max_register = IMX8QM_CSR_MISC_OFFSET,
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.val_format_endian = REGMAP_ENDIAN_NATIVE,
.num_reg_defaults_raw = IMX8QM_CSR_MISC_OFFSET / sizeof(uint32_t) + 1,
.readable_reg = imx6_pcie_readable_reg,
.writeable_reg = imx6_pcie_writeable_reg,
.cache_type = REGCACHE_NONE,
};
static int pcie_phy_poll_ack(struct imx6_pcie *imx6_pcie, bool exp_val)
{
struct dw_pcie *pci = imx6_pcie->pci;
bool val;
u32 max_iterations = 10;
u32 wait_counter = 0;
do {
val = dw_pcie_readl_dbi(pci, PCIE_PHY_STAT) &
PCIE_PHY_STAT_ACK;
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 = PCIE_PHY_CTRL_DATA(addr);
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
val |= PCIE_PHY_CTRL_CAP_ADR;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
ret = pcie_phy_poll_ack(imx6_pcie, true);
if (ret)
return ret;
val = PCIE_PHY_CTRL_DATA(addr);
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
return pcie_phy_poll_ack(imx6_pcie, false);
}
/* Read from the 16-bit PCIe PHY control registers (not memory-mapped) */
static int pcie_phy_read(struct imx6_pcie *imx6_pcie, int addr, u16 *data)
{
struct dw_pcie *pci = imx6_pcie->pci;
u32 phy_ctl;
int ret;
ret = pcie_phy_wait_ack(imx6_pcie, addr);
if (ret)
return ret;
/* assert Read signal */
phy_ctl = PCIE_PHY_CTRL_RD;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, phy_ctl);
ret = pcie_phy_poll_ack(imx6_pcie, true);
if (ret)
return ret;
*data = dw_pcie_readl_dbi(pci, PCIE_PHY_STAT);
/* deassert Read signal */
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, 0x00);
return pcie_phy_poll_ack(imx6_pcie, false);
}
static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, u16 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 = PCIE_PHY_CTRL_DATA(data);
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
/* capture data */
var |= PCIE_PHY_CTRL_CAP_DAT;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
ret = pcie_phy_poll_ack(imx6_pcie, true);
if (ret)
return ret;
/* deassert cap data */
var = PCIE_PHY_CTRL_DATA(data);
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
/* wait for ack de-assertion */
ret = pcie_phy_poll_ack(imx6_pcie, false);
if (ret)
return ret;
/* assert wr signal */
var = PCIE_PHY_CTRL_WR;
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
/* wait for ack */
ret = pcie_phy_poll_ack(imx6_pcie, true);
if (ret)
return ret;
/* deassert wr signal */
var = PCIE_PHY_CTRL_DATA(data);
dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
/* wait for ack de-assertion */
ret = pcie_phy_poll_ack(imx6_pcie, false);
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)
{
u16 tmp;
if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_PHY))
return;
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);
}
#ifdef CONFIG_ARM
/* Added for PCI abort handling */
static int imx6q_pcie_abort_handler(unsigned long addr,
unsigned int fsr, struct pt_regs *regs)
{
unsigned long pc = instruction_pointer(regs);
unsigned long instr = *(unsigned long *)pc;
int reg = (instr >> 12) & 15;
/*
* If the instruction being executed was a read,
* make it look like it read all-ones.
*/
if ((instr & 0x0c100000) == 0x04100000) {
unsigned long val;
if (instr & 0x00400000)
val = 255;
else
val = -1;
regs->uregs[reg] = val;
regs->ARM_pc += 4;
return 0;
}
if ((instr & 0x0e100090) == 0x00100090) {
regs->uregs[reg] = -1;
regs->ARM_pc += 4;
return 0;
}
return 1;
}
#endif
static int imx6_pcie_attach_pd(struct device *dev)
{
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
struct device_link *link;
/* Do nothing when in a single power domain */
if (dev->pm_domain)
return 0;
imx6_pcie->pd_pcie = dev_pm_domain_attach_by_name(dev, "pcie");
if (IS_ERR(imx6_pcie->pd_pcie))
return PTR_ERR(imx6_pcie->pd_pcie);
/* Do nothing when power domain missing */
if (!imx6_pcie->pd_pcie)
return 0;
link = device_link_add(dev, imx6_pcie->pd_pcie,
DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME |
DL_FLAG_RPM_ACTIVE);
if (!link) {
dev_err(dev, "Failed to add device_link to pcie pd.\n");
return -EINVAL;
}
imx6_pcie->pd_pcie_phy = dev_pm_domain_attach_by_name(dev, "pcie_phy");
if (IS_ERR(imx6_pcie->pd_pcie_phy))
return PTR_ERR(imx6_pcie->pd_pcie_phy);
link = device_link_add(dev, imx6_pcie->pd_pcie_phy,
DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME |
DL_FLAG_RPM_ACTIVE);
if (!link) {
dev_err(dev, "Failed to add device_link to pcie_phy pd.\n");
return -EINVAL;
}
switch (imx6_pcie->drvdata->variant) {
case IMX8QM:
case IMX8QXP:
imx6_pcie->pd_hsio_gpio = dev_pm_domain_attach_by_name(dev, "hsio_gpio");
if (IS_ERR(imx6_pcie->pd_hsio_gpio))
return PTR_ERR(imx6_pcie->pd_hsio_gpio);
link = device_link_add(dev, imx6_pcie->pd_hsio_gpio,
DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME |
DL_FLAG_RPM_ACTIVE);
if (!link) {
dev_err(dev, "Failed to add device_link to hsio_gpio pd.\n");
return -EINVAL;
}
break;
default:
break;
}
return 0;
}
static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie)
{
return imx6_pcie->controller_id == 1 ? IOMUXC_GPR16 : IOMUXC_GPR14;
}
static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
{
struct dw_pcie *pci = imx6_pcie->pci;
struct device *dev = pci->dev;
unsigned int offset;
int ret = 0;
switch (imx6_pcie->drvdata->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.
*/
usleep_range(10, 100);
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
break;
case IMX7D:
break;
case IMX8MQ:
case IMX8MM:
ret = clk_prepare_enable(imx6_pcie->pcie_aux);
if (ret) {
dev_err(dev, "unable to enable pcie_aux clock\n");
break;
}
offset = imx6_pcie_grp_offset(imx6_pcie);
/*
* Set the over ride low and enabled
* make sure that REF_CLK is turned on.
*/
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE,
0);
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN);
break;
case IMX8QXP:
case IMX8QM:
ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
if (ret) {
dev_err(dev, "unable to enable pcie_axi clock\n");
break;
}
ret = clk_prepare_enable(imx6_pcie->pcie_per);
if (ret) {
dev_err(dev, "unable to enable pcie_per clock\n");
clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
break;
}
ret = clk_prepare_enable(imx6_pcie->phy_per);
if (unlikely(ret)) {
clk_disable_unprepare(imx6_pcie->pcie_per);
clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
dev_err(dev, "unable to enable phy per clock\n");
}
ret = clk_prepare_enable(imx6_pcie->misc_per);
if (unlikely(ret)) {
clk_disable_unprepare(imx6_pcie->phy_per);
clk_disable_unprepare(imx6_pcie->pcie_per);
clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
dev_err(dev, "unable to enable misc per clock\n");
}
break;
}
return ret;
}
static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
{
u32 val;
struct device *dev = imx6_pcie->pci->dev;
if (regmap_read_poll_timeout(imx6_pcie->iomuxc_gpr,
IOMUXC_GPR22, val,
val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED,
PHY_PLL_LOCK_WAIT_USLEEP_MAX,
PHY_PLL_LOCK_WAIT_TIMEOUT))
dev_err(dev, "PCIe PLL lock timeout\n");
}
static void imx8_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
{
u32 val, retries = 0, tmp = 0, orig = 0;
struct dw_pcie *pci = imx6_pcie->pci;
struct device *dev = pci->dev;
switch (imx6_pcie->drvdata->variant) {
case IMX8MM:
for (retries = 0; retries < PHY_PLL_LOCK_WAIT_MAX_RETRIES;
retries++) {
tmp = readl(imx6_pcie->phy_base + PCIE_PHY_CMN_REG75);
if (tmp == PCIE_PHY_CMN_REG75_PLL_DONE)
break;
udelay(10);
}
break;
case IMX8QXP:
case IMX8QM:
for (retries = 0; retries < PHY_PLL_LOCK_WAIT_MAX_RETRIES;
retries++) {
if (imx6_pcie->hsio_cfg == PCIEAX1PCIEBX1SATA) {
regmap_read(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_PHYX2_OFFSET + 0x4,
&tmp);
if (imx6_pcie->controller_id == 0) /* pciea 1 lanes */
orig = IMX8QM_STTS0_LANE0_TX_PLL_LOCK;
else /* pcieb 1 lanes */
orig = IMX8QM_STTS0_LANE1_TX_PLL_LOCK;
} else if (imx6_pcie->hsio_cfg == PCIEAX2PCIEBX1) {
val = IMX8QM_CSR_PHYX2_OFFSET
+ imx6_pcie->controller_id * SZ_64K;
regmap_read(imx6_pcie->iomuxc_gpr,
val + IMX8QM_CSR_PHYX_STTS0_OFFSET,
&tmp);
orig = IMX8QM_STTS0_LANE0_TX_PLL_LOCK;
if (imx6_pcie->controller_id == 0) /* pciea 2 lanes */
orig |= IMX8QM_STTS0_LANE1_TX_PLL_LOCK;
} else if (imx6_pcie->hsio_cfg == PCIEAX2SATA) {
regmap_read(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_PHYX2_OFFSET + 0x4,
&tmp);
orig = IMX8QM_STTS0_LANE0_TX_PLL_LOCK;
orig |= IMX8QM_STTS0_LANE1_TX_PLL_LOCK;
}
tmp &= orig;
if (tmp == orig)
break;
udelay(10);
}
break;
default:
break;
}
if (retries >= PHY_PLL_LOCK_WAIT_MAX_RETRIES)
dev_err(dev, "PCIe PLL lock timeout\n");
}
static void imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie)
{
int ret;
struct dw_pcie *pci = imx6_pcie->pci;
struct device *dev = pci->dev;
ret = clk_prepare_enable(imx6_pcie->pcie_phy);
if (ret)
dev_err(dev, "unable to enable pcie_phy clock\n");
ret = clk_prepare_enable(imx6_pcie->pcie_bus);
if (ret)
dev_err(dev, "unable to enable pcie_bus clock\n");
ret = clk_prepare_enable(imx6_pcie->pcie);
if (ret)
dev_err(dev, "unable to enable pcie clock\n");
ret = imx6_pcie_enable_ref_clk(imx6_pcie);
if (ret)
dev_err(dev, "unable to enable pcie ref clock\n");
/* allow the clocks to stabilize */
usleep_range(200, 500);
}
static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
{
clk_disable_unprepare(imx6_pcie->pcie);
clk_disable_unprepare(imx6_pcie->pcie_phy);
clk_disable_unprepare(imx6_pcie->pcie_bus);
switch (imx6_pcie->drvdata->variant) {
case IMX6SX:
clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
break;
case IMX7D:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
break;
case IMX8MQ:
case IMX8MM:
clk_disable_unprepare(imx6_pcie->pcie_aux);
break;
case IMX8QXP:
case IMX8QM:
clk_disable_unprepare(imx6_pcie->pcie_per);
clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
clk_disable_unprepare(imx6_pcie->phy_per);
clk_disable_unprepare(imx6_pcie->misc_per);
break;
default:
break;
}
}
static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
{
u32 val;
int i;
struct device *dev = imx6_pcie->pci->dev;
switch (imx6_pcie->drvdata->variant) {
case IMX7D:
case IMX8MQ:
case IMX8MM:
reset_control_assert(imx6_pcie->pciephy_reset);
reset_control_assert(imx6_pcie->apps_reset);
break;
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;
case IMX8QXP:
imx6_pcie_clk_enable(imx6_pcie);
val = IMX8QM_CSR_PCIEB_OFFSET;
regmap_update_bits(imx6_pcie->iomuxc_gpr,
val + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_BUTTON_RST_N,
IMX8QM_CTRL_BUTTON_RST_N);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
val + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_PERST_N,
IMX8QM_CTRL_PERST_N);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
val + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_POWER_UP_RST_N,
IMX8QM_CTRL_POWER_UP_RST_N);
break;
case IMX8QM:
imx6_pcie_clk_enable(imx6_pcie);
for (i = 0; i <= imx6_pcie->controller_id; i++) {
val = IMX8QM_CSR_PCIEA_OFFSET + i * SZ_64K;
regmap_update_bits(imx6_pcie->iomuxc_gpr,
val + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_BUTTON_RST_N,
IMX8QM_CTRL_BUTTON_RST_N);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
val + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_PERST_N,
IMX8QM_CTRL_PERST_N);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
val + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_POWER_UP_RST_N,
IMX8QM_CTRL_POWER_UP_RST_N);
}
break;
}
if (imx6_pcie->vpcie && regulator_is_enabled(imx6_pcie->vpcie) > 0) {
int ret = regulator_disable(imx6_pcie->vpcie);
if (ret)
dev_err(dev, "failed to disable vpcie regulator: %d\n",
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, i;
u32 val, tmp;
if (imx6_pcie->vpcie && !regulator_is_enabled(imx6_pcie->vpcie)) {
ret = regulator_enable(imx6_pcie->vpcie);
if (ret) {
dev_err(dev, "failed to enable vpcie regulator: %d\n",
ret);
return;
}
}
switch (imx6_pcie->drvdata->variant) {
case IMX8QXP:
case IMX8QM:
/* ClKs had been enabled */
break;
default:
imx6_pcie_clk_enable(imx6_pcie);
break;
}
/* 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->drvdata->variant) {
case IMX8QXP:
case IMX8QM:
val = IMX8QM_CSR_PCIEA_OFFSET
+ imx6_pcie->controller_id * SZ_64K;
/* bit19 PM_REQ_CORE_RST of pciex#_stts0 should be cleared. */
for (i = 0; i < 100; i++) {
regmap_read(imx6_pcie->iomuxc_gpr,
val + IMX8QM_CSR_PCIE_STTS0_OFFSET,
&tmp);
if ((tmp & IMX8QM_CTRL_STTS0_PM_REQ_CORE_RST) == 0)
break;
udelay(10);
}
if ((tmp & IMX8QM_CTRL_STTS0_PM_REQ_CORE_RST) != 0)
dev_err(dev, "ERROR PM_REQ_CORE_RST is still set.\n");
/* wait for phy pll lock firstly. */
imx8_pcie_wait_for_phy_pll_lock(imx6_pcie);
break;
case IMX8MQ:
case IMX8MM:
reset_control_deassert(imx6_pcie->pciephy_reset);
imx8_pcie_wait_for_phy_pll_lock(imx6_pcie);
/*
* Set the over ride low and enabled
* make sure that REF_CLK is turned on.
*/
val = imx6_pcie_grp_offset(imx6_pcie);
regmap_update_bits(imx6_pcie->iomuxc_gpr, val,
IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE,
0);
regmap_update_bits(imx6_pcie->iomuxc_gpr, val,
IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN);
if (imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_L1SS) {
/*
* Configure the CLK_REQ# high, let the L1SS
* automatically controlled by HW later.
*/
reset_control_deassert(imx6_pcie->clkreq_reset);
/*
* Configure the L1 latency of rc to less than 64us
* Otherwise, the L1/L1SUB wouldn't be enable by ASPM.
*/
dw_pcie_dbi_ro_wr_en(pci);
val = readl(pci->dbi_base + SZ_1M +
IMX8MQ_PCIE_LINK_CAP_REG_OFFSET);
val &= ~PCI_EXP_LNKCAP_L1EL;
val |= IMX8MQ_PCIE_LINK_CAP_L1EL_64US;
writel(val, pci->dbi_base + SZ_1M +
IMX8MQ_PCIE_LINK_CAP_REG_OFFSET);
dw_pcie_dbi_ro_wr_dis(pci);
}
break;
case IMX7D:
reset_control_deassert(imx6_pcie->pciephy_reset);
/* Workaround for ERR010728, failure of PCI-e PLL VCO to
* oscillate, especially when cold. This turns off "Duty-cycle
* Corrector" and other mysterious undocumented things.
*/
if (likely(imx6_pcie->phy_base)) {
/* De-assert DCC_FB_EN */
writel(PCIE_PHY_CMN_REG4_DCC_FB_EN,
imx6_pcie->phy_base + PCIE_PHY_CMN_REG4);
/* Assert RX_EQS and RX_EQS_SEL */
writel(PCIE_PHY_CMN_REG24_RX_EQ_SEL
| PCIE_PHY_CMN_REG24_RX_EQ,
imx6_pcie->phy_base + PCIE_PHY_CMN_REG24);
/* Assert ATT_MODE */
writel(PCIE_PHY_CMN_REG26_ATT_MODE,
imx6_pcie->phy_base + PCIE_PHY_CMN_REG26);
} else {
dev_warn(dev, "Unable to apply ERR010728 workaround. DT missing fsl,imx7d-pcie-phy phandle ?\n");
}
imx7d_pcie_wait_for_phy_pll_lock(imx6_pcie);
break;
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;
}
static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie)
{
unsigned int mask, val;
if (IS_ENABLED(CONFIG_EP_MODE_IN_EP_RC_SYS)) {
if (imx6_pcie->drvdata->variant == IMX8QM
|| imx6_pcie->drvdata->variant == IMX8QXP) {
val = IMX8QM_CSR_PCIEA_OFFSET
+ imx6_pcie->controller_id * SZ_64K;
regmap_update_bits(imx6_pcie->iomuxc_gpr,
val, IMX8QM_PCIE_TYPE_MASK,
PCI_EXP_TYPE_ENDPOINT << 24);
} else {
if (unlikely(imx6_pcie->controller_id))
/* iMX8MQ second PCIE */
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IOMUXC_GPR12,
IMX6Q_GPR12_DEVICE_TYPE >> 4,
PCI_EXP_TYPE_ENDPOINT << 8);
else
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IOMUXC_GPR12,
IMX6Q_GPR12_DEVICE_TYPE,
PCI_EXP_TYPE_ENDPOINT << 12);
}
} else {
if (imx6_pcie->drvdata->variant == IMX8QM ||
imx6_pcie->drvdata->variant == IMX8QXP) {
val = IMX8QM_CSR_PCIEA_OFFSET
+ imx6_pcie->controller_id * SZ_64K;
regmap_update_bits(imx6_pcie->iomuxc_gpr,
val, IMX8QM_PCIE_TYPE_MASK,
PCI_EXP_TYPE_ROOT_PORT << 24);
} else if (imx6_pcie->drvdata->variant == IMX8MQ &&
imx6_pcie->controller_id == 1) {
mask = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE;
val = FIELD_PREP(IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
PCI_EXP_TYPE_ROOT_PORT);
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
mask, val);
} else {
mask = IMX6Q_GPR12_DEVICE_TYPE;
val = FIELD_PREP(IMX6Q_GPR12_DEVICE_TYPE,
PCI_EXP_TYPE_ROOT_PORT);
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
mask, val);
}
}
}
static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
{
unsigned int offset;
switch (imx6_pcie->drvdata->variant) {
case IMX8QXP:
case IMX8QM:
if (imx6_pcie->hsio_cfg == PCIEAX2SATA) {
/*
* bit 0 rx ena 1.
* bit12 PHY_X1_EPCS_SEL 1.
* bit13 phy_ab_select 0.
*/
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_PHYX2_OFFSET,
IMX8QM_PHYX2_CTRL0_APB_MASK,
IMX8QM_PHY_APB_RSTN_0
| IMX8QM_PHY_APB_RSTN_1);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_MISC_OFFSET,
IMX8QM_MISC_PHYX1_EPCS_SEL,
IMX8QM_MISC_PHYX1_EPCS_SEL);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_MISC_OFFSET,
IMX8QM_MISC_PCIE_AB_SELECT,
0);
} else if (imx6_pcie->hsio_cfg == PCIEAX1PCIEBX1SATA) {
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_PHYX2_OFFSET,
IMX8QM_PHYX2_CTRL0_APB_MASK,
IMX8QM_PHY_APB_RSTN_0
| IMX8QM_PHY_APB_RSTN_1);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_MISC_OFFSET,
IMX8QM_MISC_PHYX1_EPCS_SEL,
IMX8QM_MISC_PHYX1_EPCS_SEL);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_MISC_OFFSET,
IMX8QM_MISC_PCIE_AB_SELECT,
IMX8QM_MISC_PCIE_AB_SELECT);
} else if (imx6_pcie->hsio_cfg == PCIEAX2PCIEBX1) {
/*
* bit 0 rx ena 1.
* bit12 PHY_X1_EPCS_SEL 0.
* bit13 phy_ab_select 1.
*/
if (imx6_pcie->controller_id)
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_PHYX1_OFFSET,
IMX8QM_PHY_APB_RSTN_0,
IMX8QM_PHY_APB_RSTN_0);
else
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_PHYX2_OFFSET,
IMX8QM_PHYX2_CTRL0_APB_MASK,
IMX8QM_PHY_APB_RSTN_0
| IMX8QM_PHY_APB_RSTN_1);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_MISC_OFFSET,
IMX8QM_MISC_PHYX1_EPCS_SEL,
0);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_MISC_OFFSET,
IMX8QM_MISC_PCIE_AB_SELECT,
IMX8QM_MISC_PCIE_AB_SELECT);
}
if (imx6_pcie->ext_osc) {
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_MISC_OFFSET,
IMX8QM_MISC_IOB_RXENA,
IMX8QM_MISC_IOB_RXENA);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_MISC_OFFSET,
IMX8QM_MISC_IOB_TXENA,
0);
} else {
/* Try to used the internal pll as ref clk */
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_MISC_OFFSET,
IMX8QM_MISC_IOB_RXENA,
0);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_MISC_OFFSET,
IMX8QM_MISC_IOB_TXENA,
IMX8QM_MISC_IOB_TXENA);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
IMX8QM_CSR_MISC_OFFSET,
IMX8QM_CSR_MISC_IOB_A_0_TXOE
| IMX8QM_CSR_MISC_IOB_A_0_M1M0_MASK,
IMX8QM_CSR_MISC_IOB_A_0_TXOE
| IMX8QM_CSR_MISC_IOB_A_0_M1M0_2);
}
break;
case IMX8MM:
offset = imx6_pcie_grp_offset(imx6_pcie);
dev_info(imx6_pcie->pci->dev, "%s REF_CLK is used!.\n",
imx6_pcie->ext_osc ? "EXT" : "PLL");
if (imx6_pcie->ext_osc) {
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MQ_GPR_PCIE_REF_USE_PAD, 0);
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_REF_CLK_SEL,
IMX8MM_GPR_PCIE_REF_CLK_SEL);
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_AUX_EN,
IMX8MM_GPR_PCIE_AUX_EN);
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_POWER_OFF, 0);
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_SSC_EN, 0);
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_REF_CLK_SEL,
IMX8MM_GPR_PCIE_REF_CLK_EXT);
udelay(100);
/* Do the PHY common block reset */
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_CMN_RST,
IMX8MM_GPR_PCIE_CMN_RST);
udelay(200);
} else {
/* Configure the internal PLL as REF clock */
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MQ_GPR_PCIE_REF_USE_PAD, 0);
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_REF_CLK_SEL,
IMX8MM_GPR_PCIE_REF_CLK_SEL);
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_AUX_EN,
IMX8MM_GPR_PCIE_AUX_EN);
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_POWER_OFF, 0);
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_SSC_EN, 0);
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_REF_CLK_SEL,
IMX8MM_GPR_PCIE_REF_CLK_PLL);
udelay(100);
/* Configure the PHY */
writel(PCIE_PHY_CMN_REG62_PLL_CLK_OUT,
imx6_pcie->phy_base + PCIE_PHY_CMN_REG62);
writel(PCIE_PHY_CMN_REG64_AUX_RX_TX_TERM,
imx6_pcie->phy_base + PCIE_PHY_CMN_REG64);
/* Do the PHY common block reset */
regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
IMX8MM_GPR_PCIE_CMN_RST,
IMX8MM_GPR_PCIE_CMN_RST);
udelay(200);
}
/*
* In order to pass the compliance tests.
* Configure the TRSV regiser of iMX8MM PCIe PHY.
*/
writel(PCIE_PHY_TRSV_REG5_GEN1_DEEMP,
imx6_pcie->phy_base + PCIE_PHY_TRSV_REG5);
writel(PCIE_PHY_TRSV_REG6_GEN2_DEEMP,
imx6_pcie->phy_base + PCIE_PHY_TRSV_REG6);
break;
case IMX8MQ:
/*
* TODO: Currently this code assumes external
* oscillator is being used
*/
regmap_update_bits(imx6_pcie->iomuxc_gpr,
imx6_pcie_grp_offset(imx6_pcie),
IMX8MQ_GPR_PCIE_REF_USE_PAD,
IMX8MQ_GPR_PCIE_REF_USE_PAD);
break;
case IMX7D:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, 0);
break;
case IMX6SX:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6SX_GPR12_PCIE_RX_EQ_MASK,
IMX6SX_GPR12_PCIE_RX_EQ_2);
/* FALLTHROUGH */
default:
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_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);
break;
}
imx6_pcie_configure_type(imx6_pcie);
}
static int imx6_setup_phy_mpll(struct imx6_pcie *imx6_pcie)
{
unsigned long phy_rate = clk_get_rate(imx6_pcie->pcie_phy);
int mult, div;
u16 val;
if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_PHY))
return 0;
switch (phy_rate) {
case 125000000:
/*
* The default settings of the MPLL are for a 125MHz input
* clock, so no need to reconfigure anything in that case.
*/
return 0;
case 100000000:
mult = 25;
div = 0;
break;
case 200000000:
mult = 25;
div = 1;
break;
default:
dev_err(imx6_pcie->pci->dev,
"Unsupported PHY reference clock rate %lu\n", phy_rate);
return -EINVAL;
}
pcie_phy_read(imx6_pcie, PCIE_PHY_MPLL_OVRD_IN_LO, &val);
val &= ~(PCIE_PHY_MPLL_MULTIPLIER_MASK <<
PCIE_PHY_MPLL_MULTIPLIER_SHIFT);
val |= mult << PCIE_PHY_MPLL_MULTIPLIER_SHIFT;
val |= PCIE_PHY_MPLL_MULTIPLIER_OVRD;
pcie_phy_write(imx6_pcie, PCIE_PHY_MPLL_OVRD_IN_LO, val);
pcie_phy_read(imx6_pcie, PCIE_PHY_ATEOVRD, &val);
val &= ~(PCIE_PHY_ATEOVRD_REF_CLKDIV_MASK <<
PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT);
val |= div << PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT;
val |= PCIE_PHY_ATEOVRD_EN;
pcie_phy_write(imx6_pcie, PCIE_PHY_ATEOVRD, val);
return 0;
}
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 -ETIMEDOUT;
}
static void imx6_pcie_ltssm_enable(struct device *dev)
{
u32 val;
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
switch (imx6_pcie->drvdata->variant) {
case IMX6Q:
case IMX6SX:
case IMX6QP:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6Q_GPR12_PCIE_CTL_2,
IMX6Q_GPR12_PCIE_CTL_2);
break;
case IMX7D:
case IMX8MQ:
case IMX8MM:
reset_control_deassert(imx6_pcie->apps_reset);
break;
case IMX8QXP:
case IMX8QM:
/* Bit4 of the CTRL2 */
val = IMX8QM_CSR_PCIEA_OFFSET
+ imx6_pcie->controller_id * SZ_64K;
regmap_update_bits(imx6_pcie->iomuxc_gpr,
val + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_LTSSM_ENABLE,
IMX8QM_CTRL_LTSSM_ENABLE);
break;
}
}
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. */
imx6_pcie_ltssm_enable(dev);
ret = dw_pcie_wait_for_link(pci);
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 |= imx6_pcie->link_gen;
dw_pcie_writel_dbi(pci, PCIE_RC_LCR, tmp);
/*
* 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);
if (imx6_pcie->drvdata->flags &
IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE) {
/*
* On i.MX7, DIRECT_SPEED_CHANGE behaves differently
* from i.MX6 family when no link speed transition
* occurs and we go Gen1 -> yep, Gen1. The difference
* is that, in such case, it will not be cleared by HW
* which will cause the following code to report false
* failure.
*/
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 = dw_pcie_wait_for_link(pci);
if (ret) {
dev_err(dev, "Failed to bring link up!\n");
goto err_reset_phy;
}
} else {
dev_info(dev, "Link: Gen2 disabled\n");
}
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_PORT_DEBUG0),
dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1));
imx6_pcie_reset_phy(imx6_pcie);
if (!IS_ENABLED(CONFIG_PCI_IMX6_COMPLIANCE_TEST)) {
imx6_pcie_clk_disable(imx6_pcie);
if (imx6_pcie->vpcie != NULL)
regulator_disable(imx6_pcie->vpcie);
if (imx6_pcie->epdev_on != NULL)
regulator_disable(imx6_pcie->epdev_on);
}
return ret;
}
static void pci_imx_set_msi_en(struct pcie_port *pp)
{
u16 val;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
if (pci_msi_enabled()) {
val = dw_pcie_readw_dbi(pci, PCIE_RC_IMX6_MSI_CAP +
PCI_MSI_FLAGS);
val |= PCI_MSI_FLAGS_ENABLE;
dw_pcie_writew_dbi(pci, PCIE_RC_IMX6_MSI_CAP + PCI_MSI_FLAGS,
val);
}
}
static int 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);
if (gpio_is_valid(imx6_pcie->dis_gpio))
gpio_set_value_cansleep(imx6_pcie->dis_gpio, 1);
imx6_pcie_assert_core_reset(imx6_pcie);
imx6_pcie_init_phy(imx6_pcie);
imx6_pcie_deassert_core_reset(imx6_pcie);
imx6_setup_phy_mpll(imx6_pcie);
if (!IS_ENABLED(CONFIG_EP_MODE_IN_EP_RC_SYS)) {
dw_pcie_setup_rc(pp);
pci_imx_set_msi_en(pp);
if (imx6_pcie_establish_link(imx6_pcie))
return -ENODEV;
if (IS_ENABLED(CONFIG_PCI_MSI))
dw_pcie_msi_init(pp);
}
return 0;
}
static const struct dw_pcie_host_ops imx6_pcie_host_ops = {
.host_init = imx6_pcie_host_init,
};
static int 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;
}
}
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 u64 imx6_pcie_cpu_addr_fixup(struct dw_pcie *pcie, u64 cpu_addr)
{
struct pcie_port *pp = &pcie->pp;
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pcie);
if (imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_CPU_ADDR_FIXUP)
return (cpu_addr + imx6_pcie->local_addr - pp->mem_base);
else
return cpu_addr;
}
static const struct dw_pcie_ops dw_pcie_ops = {
/* No special ops needed, but pcie-designware still expects this struct */
.cpu_addr_fixup = imx6_pcie_cpu_addr_fixup,
};
static ssize_t ep_bar0_addr_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
struct dw_pcie *pci = imx6_pcie->pci;
return sprintf(buf, "imx-pcie-bar0-addr-info start 0x%08x\n",
readl(pci->dbi_base + PCI_BASE_ADDRESS_0));
}
static ssize_t ep_bar0_addr_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
u32 bar_start;
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
struct dw_pcie *pci = imx6_pcie->pci;
if (sscanf(buf, "%x\n", &bar_start) != 1)
return -EINVAL;
writel(bar_start, pci->dbi_base + PCI_BASE_ADDRESS_0);
return count;
}
static void imx6_pcie_regions_setup(struct device *dev)
{
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
struct dw_pcie *pci = imx6_pcie->pci;
struct pcie_port *pp = &pci->pp;
switch (imx6_pcie->drvdata->variant) {
case IMX8QM:
case IMX8QXP:
case IMX8MQ:
case IMX8MM:
/*
* RPMSG reserved 4Mbytes, but only used up to 2Mbytes.
* The left 2Mbytes can be used here.
*/
if (ddr_test_region == 0)
dev_err(dev, "invalid ddr test region.\n");
break;
case IMX6SX:
case IMX7D:
ddr_test_region = 0xb0000000;
break;
case IMX6Q:
case IMX6QP:
ddr_test_region = 0x40000000;
break;
}
dev_info(dev, "ddr_test_region is 0x%08x.\n", ddr_test_region);
dw_pcie_prog_outbound_atu(pci, 0, 0, pp->mem_base,
ddr_test_region, test_region_size);
}
static DEVICE_ATTR_RW(ep_bar0_addr);
static struct attribute *imx6_pcie_ep_attrs[] = {
&dev_attr_ep_bar0_addr.attr,
NULL
};
static struct attribute_group imx6_pcie_attrgroup = {
.attrs = imx6_pcie_ep_attrs,
};
static void imx6_pcie_setup_ep(struct dw_pcie *pci)
{
int ret;
u32 val;
u32 lanes;
struct device_node *np = pci->dev->of_node;
ret = of_property_read_u32(np, "num-lanes", &lanes);
if (ret)
lanes = 0;
/* set the number of lanes */
val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
val &= ~PORT_LINK_MODE_MASK;
switch (lanes) {
case 1:
val |= PORT_LINK_MODE_1_LANES;
break;
default:
dev_err(pci->dev, "num-lanes %u: invalid value\n", lanes);
return;
}
dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);
/* set link width speed control register */
val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
switch (lanes) {
case 1:
val |= PORT_LOGIC_LINK_WIDTH_1_LANES;
break;
default:
dev_err(pci->dev, "num-lanes %u: invalid value\n", lanes);
return;
}
dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
/* get iATU unroll support */
val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
if (val == 0xffffffff)
pci->iatu_unroll_enabled = 1;
dev_info(pci->dev, "iATU unroll: %s\n",
pci->iatu_unroll_enabled ? "enabled" : "disabled");
/* CMD reg:I/O space, MEM space, and Bus Master Enable */
writel(readl(pci->dbi_base + PCI_COMMAND)
| PCI_COMMAND_IO
| PCI_COMMAND_MEMORY
| PCI_COMMAND_MASTER,
pci->dbi_base + PCI_COMMAND);
/*
* configure the class_rev(emaluate one memory ram ep device),
* bar0 and bar1 of ep
*/
writel(0xdeadbeaf, pci->dbi_base + PCI_VENDOR_ID);
writel((readl(pci->dbi_base + PCI_CLASS_REVISION) & 0xFFFF)
| (PCI_CLASS_MEMORY_RAM << 16),
pci->dbi_base + PCI_CLASS_REVISION);
writel(0xdeadbeaf, pci->dbi_base
+ PCI_SUBSYSTEM_VENDOR_ID);
/* 32bit none-prefetchable 8M bytes memory on bar0 */
writel(0x0, pci->dbi_base + PCI_BASE_ADDRESS_0);
writel(SZ_8M - 1, pci->dbi_base + (1 << 12)
+ PCI_BASE_ADDRESS_0);
/* None used bar1 */
writel(0x0, pci->dbi_base + PCI_BASE_ADDRESS_1);
writel(0, pci->dbi_base + (1 << 12) + PCI_BASE_ADDRESS_1);
/* 4K bytes IO on bar2 */
writel(0x1, pci->dbi_base + PCI_BASE_ADDRESS_2);
writel(SZ_4K - 1, pci->dbi_base + (1 << 12) +
PCI_BASE_ADDRESS_2);
/*
* 32bit prefetchable 1M bytes memory on bar3
* FIXME BAR MASK3 is not changeable, the size
* is fixed to 256 bytes.
*/
writel(0x8, pci->dbi_base + PCI_BASE_ADDRESS_3);
writel(SZ_1M - 1, pci->dbi_base + (1 << 12)
+ PCI_BASE_ADDRESS_3);
/*
* 64bit prefetchable 1M bytes memory on bar4-5.
* FIXME BAR4,5 are not enabled yet
*/
writel(0xc, pci->dbi_base + PCI_BASE_ADDRESS_4);
writel(SZ_1M - 1, pci->dbi_base + (1 << 12)
+ PCI_BASE_ADDRESS_4);
writel(0, pci->dbi_base + (1 << 12) + PCI_BASE_ADDRESS_5);
}
static irqreturn_t imx6_pcie_dma_isr(int irq, void *param)
{
u32 irqs, offset;
struct pcie_port *pp = (struct pcie_port *)param;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
offset = imx6_pcie->dma_unroll_offset;
/* check write isr */
irqs = readl(pci->dbi_base + offset + DMA_WRITE_INT_STS);
if (irqs & DMA_DONE_INT_STS) {
/* write 1 clear */
writel(irqs & DMA_DONE_INT_STS,
pci->dbi_base + offset + DMA_WRITE_INT_CLR);
dma_w_end = 1;
} else if (irqs & DMA_ABORT_INT_STS) {
pr_info("imx pcie dma write error 0x%0x.\n", irqs);
}
/* check read isr */
irqs = readl(pci->dbi_base + offset + DMA_READ_INT_STS);
if (irqs & DMA_DONE_INT_STS) {
/* write 1 clear */
writel(irqs & DMA_DONE_INT_STS,
pci->dbi_base + offset + DMA_READ_INT_CLR);
dma_r_end = 1;
} else if (irqs & DMA_ABORT_INT_STS) {
pr_info("imx pcie dma read error 0x%0x.", irqs);
}
return IRQ_HANDLED;
}
/**
* imx6_pcie_local_dma_start - Start one local iMX PCIE DMA.
* @pp: the port start the dma transmission.
* @dir: direction of the dma, 1 read, 0 write;
* @chl: the channel num of the iMX PCIE DMA(0 - 7).
* @src: source DMA address.
* @dst: destination DMA address.
* @len: transfer length.
*/
static int imx6_pcie_local_dma_start(struct pcie_port *pp, bool dir,
unsigned int chl, dma_addr_t src, dma_addr_t dst,
unsigned int len)
{
u32 offset, doorbell, unroll_cal;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
if (pp == NULL)
return -EINVAL;
if (chl > MAX_PCIE_DMA_CHANNELS)
return -EINVAL;
offset = imx6_pcie->dma_unroll_offset;
/* enable dma engine, dir 1:read. 0:write. */
if (dir)
writel(DMA_READ_ENGINE_EN,
pci->dbi_base + offset
+ DMA_READ_ENGINE_EN_OFF);
else
writel(DMA_WRITE_ENGINE_EN,
pci->dbi_base + offset
+ DMA_WRITE_ENGINE_EN_OFF);
writel(0x0, pci->dbi_base + offset + DMA_WRITE_INT_MASK);
writel(0x0, pci->dbi_base + offset + DMA_READ_INT_MASK);
/* ch dir and ch num */
if (offset == 0) {
writel((dir << 31) | chl, pci->dbi_base + DMA_VIEWPOT_SEL_OFF);
writel(DMA_CHANNEL_CTRL_1_LIE,
pci->dbi_base + DMA_CHANNEL_CTRL_1);
writel(0x0, pci->dbi_base + DMA_CHANNEL_CTRL_2);
writel(len, pci->dbi_base + DMA_TRANSFER_SIZE);
writel((u32)src, pci->dbi_base + DMA_SAR_LOW);
writel(0x0, pci->dbi_base + DMA_SAR_HIGH);
writel((u32)dst, pci->dbi_base + DMA_DAR_LOW);
writel(0x0, pci->dbi_base + DMA_DAR_HIGH);
} else {
unroll_cal = DMA_UNROLL_CDM_OFFSET
+ 0x200 * (chl + 1) + 0x100 * dir;
writel(DMA_CHANNEL_CTRL_1_LIE, pci->dbi_base + unroll_cal);
writel(0x0, pci->dbi_base + unroll_cal + 0x4);
writel(len, pci->dbi_base + unroll_cal + 0x8);
writel((u32)src, pci->dbi_base + unroll_cal + 0xc);
writel(0x0, pci->dbi_base + unroll_cal + 0x10);
writel((u32)dst, pci->dbi_base + unroll_cal + 0x14);
writel(0x0, pci->dbi_base + unroll_cal + 0x18);
}
doorbell = dir ? DMA_READ_DOORBELL : DMA_WRITE_DOORBELL;
writel(chl, pci->dbi_base + offset + doorbell);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static void imx6_pcie_ltssm_disable(struct device *dev)
{
u32 val;
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
switch (imx6_pcie->drvdata->variant) {
case IMX6SX:
case IMX6QP:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6Q_GPR12_PCIE_CTL_2, 0);
break;
case IMX7D:
case IMX8MQ:
case IMX8MM:
reset_control_assert(imx6_pcie->apps_reset);
break;
case IMX8QXP:
case IMX8QM:
/* Bit4 of the CTRL2 */
val = IMX8QM_CSR_PCIEA_OFFSET
+ imx6_pcie->controller_id * SZ_64K;
regmap_update_bits(imx6_pcie->iomuxc_gpr,
val + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_LTSSM_ENABLE, 0);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
val + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_READY_ENTR_L23, 0);
break;
default:
dev_err(dev, "ltssm_disable not supported\n");
}
}
static void imx6_pcie_pm_turnoff(struct imx6_pcie *imx6_pcie)
{
int i;
u32 dst, val;
struct device *dev = imx6_pcie->pci->dev;
/* Some variants have a turnoff reset in DT */
if (imx6_pcie->turnoff_reset) {
reset_control_assert(imx6_pcie->turnoff_reset);
reset_control_deassert(imx6_pcie->turnoff_reset);
goto pm_turnoff_sleep;
}
/* Others poke directly at IOMUXC registers */
switch (imx6_pcie->drvdata->variant) {
case IMX6SX:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6SX_GPR12_PCIE_PM_TURN_OFF,
IMX6SX_GPR12_PCIE_PM_TURN_OFF);
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6SX_GPR12_PCIE_PM_TURN_OFF, 0);
break;
case IMX6QP:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6SX_GPR12_PCIE_PM_TURN_OFF,
IMX6SX_GPR12_PCIE_PM_TURN_OFF);
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6SX_GPR12_PCIE_PM_TURN_OFF, 0);
break;
case IMX8QXP:
case IMX8QM:
dst = IMX8QM_CSR_PCIEA_OFFSET + imx6_pcie->controller_id * SZ_64K;
regmap_update_bits(imx6_pcie->iomuxc_gpr,
dst + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_PM_XMT_TURNOFF,
IMX8QM_CTRL_PM_XMT_TURNOFF);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
dst + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_PM_XMT_TURNOFF,
0);
regmap_update_bits(imx6_pcie->iomuxc_gpr,
dst + IMX8QM_CSR_PCIE_CTRL2_OFFSET,
IMX8QM_CTRL_READY_ENTR_L23,
IMX8QM_CTRL_READY_ENTR_L23);
/* check the L2 is entered or not. */
for (i = 0; i < 10000; i++) {
regmap_read(imx6_pcie->iomuxc_gpr,
dst + IMX8QM_CSR_PCIE_STTS0_OFFSET,
&val);
if (val & IMX8QM_CTRL_STTS0_PM_LINKST_IN_L2)
break;
udelay(10);
}
if ((val & IMX8QM_CTRL_STTS0_PM_LINKST_IN_L2) == 0)
dev_err(dev, "PCIE%d can't enter into L2.\n",
imx6_pcie->controller_id);
break;
default:
dev_err(dev, "PME_Turn_Off not implemented\n");
return;
}
/*
* Components with an upstream port must respond to
* PME_Turn_Off with PME_TO_Ack but we can't check.
*
* The standard recommends a 1-10ms timeout after which to
* proceed anyway as if acks were received.
*/
pm_turnoff_sleep:
usleep_range(1000, 10000);
}
static int imx6_pcie_suspend_noirq(struct device *dev)
{
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_SUSPEND))
return 0;
imx6_pcie_pm_turnoff(imx6_pcie);
imx6_pcie_ltssm_disable(dev);
imx6_pcie_clk_disable(imx6_pcie);
return 0;
}
static int imx6_pcie_resume_noirq(struct device *dev)
{
int ret;
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
struct pcie_port *pp = &imx6_pcie->pci->pp;
if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_SUSPEND))
return 0;
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);
pci_imx_set_msi_en(pp);
ret = imx6_pcie_establish_link(imx6_pcie);
if (ret < 0)
dev_info(dev, "pcie link is down after resume.\n");
return 0;
}
#endif
static const struct dev_pm_ops imx6_pcie_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx6_pcie_suspend_noirq,
imx6_pcie_resume_noirq)
};
static int imx6_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct dw_pcie *pci;
struct imx6_pcie *imx6_pcie;
struct device_node *np;
struct resource *dbi_base, *hsio_res;
struct device_node *node = dev->of_node;
void __iomem *iomem;
struct regmap_config regconfig = imx6_pcie_regconfig;
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->drvdata = of_device_get_match_data(dev);
/* Find the PHY if one is defined, only imx7d uses it */
np = of_parse_phandle(node, "fsl,imx7d-pcie-phy", 0);
if (np) {
struct resource res;
ret = of_address_to_resource(np, 0, &res);
if (ret) {
dev_err(dev, "Unable to map PCIe PHY\n");
return ret;
}
imx6_pcie->phy_base = devm_ioremap_resource(dev, &res);
if (IS_ERR(imx6_pcie->phy_base)) {
dev_err(dev, "Unable to map PCIe PHY\n");
return PTR_ERR(imx6_pcie->phy_base);
}
}
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);
if (of_property_read_u32(node, "hsio-cfg", &imx6_pcie->hsio_cfg))
imx6_pcie->hsio_cfg = 0;
if (of_property_read_u32(node, "ext_osc", &imx6_pcie->ext_osc) < 0)
imx6_pcie->ext_osc = 0;
if (of_property_read_u32(node, "local-addr", &imx6_pcie->local_addr))
imx6_pcie->local_addr = 0;
if (of_property_read_u32(node, "hard-wired", &imx6_pcie->hard_wired))
imx6_pcie->hard_wired = 0;
np = of_parse_phandle(node, "reserved-region", 0);
if (np) {
struct resource res;
if (of_address_to_resource(np, 0, &res)) {
dev_err(dev, "failed to get reserved region address\n");
of_node_put(np);
return -EINVAL;
}
ddr_test_region = res.start + SZ_2M;
of_node_put(np);
}
/* Fetch GPIOs */
imx6_pcie->clkreq_gpio = of_get_named_gpio(node, "clkreq-gpio", 0);
if (gpio_is_valid(imx6_pcie->clkreq_gpio)) {
devm_gpio_request_one(&pdev->dev, imx6_pcie->clkreq_gpio,
GPIOF_OUT_INIT_LOW, "PCIe CLKREQ");
} else if (imx6_pcie->clkreq_gpio == -EPROBE_DEFER) {
return imx6_pcie->clkreq_gpio;
}
imx6_pcie->dis_gpio = of_get_named_gpio(node, "disable-gpio", 0);
if (gpio_is_valid(imx6_pcie->dis_gpio)) {
ret = devm_gpio_request_one(&pdev->dev, imx6_pcie->dis_gpio,
GPIOF_OUT_INIT_LOW, "PCIe DIS");
if (ret) {
dev_err(&pdev->dev, "unable to get disable gpio\n");
return ret;
}
} else if (imx6_pcie->dis_gpio == -EPROBE_DEFER) {
return imx6_pcie->dis_gpio;
}
imx6_pcie->epdev_on = devm_regulator_get(&pdev->dev,
"epdev_on");
if (IS_ERR(imx6_pcie->epdev_on))
return -EPROBE_DEFER;
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;
}
} else if (imx6_pcie->reset_gpio == -EPROBE_DEFER) {
return imx6_pcie->reset_gpio;
}
/* 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);
}
switch (imx6_pcie->drvdata->variant) {
case 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);
}
break;
case IMX8MQ:
case IMX8MM:
imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
if (IS_ERR(imx6_pcie->pcie_aux)) {
dev_err(dev, "pcie_aux clock source missing or invalid\n");
return PTR_ERR(imx6_pcie->pcie_aux);
}
/* fall through */
case IMX7D:
if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
imx6_pcie->controller_id = 1;
imx6_pcie->pciephy_reset = devm_reset_control_get_exclusive(dev,
"pciephy");
if (IS_ERR(imx6_pcie->pciephy_reset)) {
dev_err(dev, "Failed to get PCIEPHY reset control\n");
return PTR_ERR(imx6_pcie->pciephy_reset);
}
imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
"apps");
if (IS_ERR(imx6_pcie->apps_reset)) {
dev_err(dev, "Failed to get PCIE APPS reset control\n");
return PTR_ERR(imx6_pcie->apps_reset);
}
break;
case IMX8QM:
case IMX8QXP:
if (dbi_base->start == IMX8_HSIO_PCIEB_BASE_ADDR)
imx6_pcie->controller_id = 1;
imx6_pcie->pcie_per = devm_clk_get(dev, "pcie_per");
if (IS_ERR(imx6_pcie->pcie_per)) {
dev_err(dev, "pcie_per clock source missing or invalid\n");
return PTR_ERR(imx6_pcie->pcie_per);
}
imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
"pcie_inbound_axi");
if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
dev_err(&pdev->dev,
"pcie clock source missing or invalid\n");
return PTR_ERR(imx6_pcie->pcie_inbound_axi);
}
imx6_pcie->phy_per = devm_clk_get(dev, "phy_per");
if (IS_ERR(imx6_pcie->phy_per)) {
dev_err(dev, "failed to get per clock.\n");
return PTR_ERR(imx6_pcie->phy_per);
}
imx6_pcie->misc_per = devm_clk_get(dev, "misc_per");
if (IS_ERR(imx6_pcie->misc_per)) {
dev_err(dev, "failed to get per clock.\n");
return PTR_ERR(imx6_pcie->misc_per);
}
hsio_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"hsio");
if (hsio_res) {
iomem = devm_ioremap_resource(dev, hsio_res);
if (IS_ERR(iomem))
return PTR_ERR(iomem);
imx6_pcie->iomuxc_gpr =
devm_regmap_init_mmio(dev, iomem, &regconfig);
if (IS_ERR(imx6_pcie->iomuxc_gpr)) {
dev_err(dev, "failed to init register map\n");
return PTR_ERR(imx6_pcie->iomuxc_gpr);
}
} else {
dev_err(dev, "missing *hsio* reg space\n");
}
break;
default:
break;
}
/* Grab turnoff reset */
imx6_pcie->turnoff_reset = devm_reset_control_get_optional_exclusive(dev, "turnoff");
if (IS_ERR(imx6_pcie->turnoff_reset)) {
dev_err(dev, "Failed to get TURNOFF reset control\n");
return PTR_ERR(imx6_pcie->turnoff_reset);
}
imx6_pcie->clkreq_reset = devm_reset_control_get_optional_exclusive(dev, "clkreq");
if (IS_ERR(imx6_pcie->clkreq_reset)) {
dev_err(dev, "Failed to get CLKREQ reset control\n");
return PTR_ERR(imx6_pcie->clkreq_reset);
}
/* Grab GPR config register range */
if (imx6_pcie->iomuxc_gpr == NULL) {
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;
imx6_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, "vpcie");
if (IS_ERR(imx6_pcie->vpcie)) {
if (PTR_ERR(imx6_pcie->vpcie) != -ENODEV)
return PTR_ERR(imx6_pcie->vpcie);
imx6_pcie->vpcie = NULL;
}
platform_set_drvdata(pdev, imx6_pcie);
ret = imx6_pcie_attach_pd(dev);
if (ret)
return ret;
ret = regulator_enable(imx6_pcie->epdev_on);
if (ret)
dev_err(dev, "failed to enable the epdev_on regulator\n");
if (IS_ENABLED(CONFIG_EP_MODE_IN_EP_RC_SYS)
&& (imx6_pcie->hard_wired == 0)) {
int i = 0, irq;
u32 val, tv_count1, tv_count2;
dma_addr_t test_reg1_dma, test_reg2_dma;
void *test_reg1, *test_reg2;
void __iomem *pcie_arb_base_addr;
struct timespec64 tv1s, tv1e, tv2s, tv2e;
struct resource_entry *win, *tmp;
LIST_HEAD(res);
struct pcie_port *pp = &pci->pp;
unsigned long timeout = jiffies + msecs_to_jiffies(300000);
/* add attributes for device */
imx6_pcie_attrgroup.attrs = imx6_pcie_ep_attrs;
ret = sysfs_create_group(&pdev->dev.kobj, &imx6_pcie_attrgroup);
if (ret)
return -EINVAL;
ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &res,
&pp->io_base);
if (ret)
return ret;
ret = devm_request_pci_bus_resources(&pdev->dev, &res);
if (ret) {
dev_err(dev, "missing ranges property\n");
pci_free_resource_list(&res);
return ret;
}
/* Get the I/O and memory ranges from DT */
resource_list_for_each_entry_safe(win, tmp, &res) {
switch (resource_type(win->res)) {
case IORESOURCE_MEM:
pp->mem = win->res;
pp->mem->name = "MEM";
pp->mem_size = resource_size(pp->mem);
pp->mem_bus_addr = pp->mem->start - win->offset;
break;
}
}
pp->mem_base = pp->mem->start;
pp->ops = &imx6_pcie_host_ops;
dev_info(dev, " try to initialize pcie ep.\n");
ret = imx6_pcie_host_init(pp);
if (ret) {
dev_info(dev, " fail to initialize pcie ep.\n");
return ret;
}
dw_pcie_dbi_ro_wr_en(pci);
imx6_pcie_setup_ep(pci);
pci_imx_set_msi_en(pp);
platform_set_drvdata(pdev, imx6_pcie);
imx6_pcie_regions_setup(dev);
dw_pcie_dbi_ro_wr_dis(pci);
/*
* iMX6SX PCIe has the stand-alone power domain.
* refer to the initialization for iMX6SX PCIe,
* release the PCIe PHY reset here,
* before LTSSM enable is set.
*/
if (imx6_pcie->drvdata->variant == IMX6SX)
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
BIT(19), 0 << 19);
/* assert LTSSM enable */
imx6_pcie_ltssm_enable(dev);
dev_info(dev, "PCIe EP: waiting for link up...\n");
/* link is indicated by the bit4 of DB_R1 register */
do {
usleep_range(10, 20);
if (time_after(jiffies, timeout)) {
dev_info(dev, "PCIe EP: link down.\n");
return 0;
}
val = readl(pci->dbi_base + PCIE_PHY_DEBUG_R1);
} while ((val & 0x10) == 0);
/* self io test */
/* Check the DMA INT exist or not */
irq = platform_get_irq_byname(pdev, "dma");
if (irq > 0)
dma_en = 1;
else
dma_en = 0;
if (dma_en) {
/* configure the DMA INT ISR */
ret = request_irq(irq, imx6_pcie_dma_isr,
IRQF_SHARED, "imx-pcie-dma", pp);
if (ret) {
pr_err("register interrupt %d failed, rc %d\n",
irq, ret);
dma_en = 0;
}
test_reg1 = dma_alloc_coherent(dev, test_region_size,
&test_reg1_dma, GFP_KERNEL);
test_reg2 = dma_alloc_coherent(dev, test_region_size,
&test_reg2_dma, GFP_KERNEL);
if (!(test_reg1 && test_reg2))
dma_en = 0; /* Roll back to PIO. */
dma_r_end = dma_w_end = 0;
val = readl(pci->dbi_base + DMA_CTRL_VIEWPORT_OFF);
if (val == 0xffffffff)
imx6_pcie->dma_unroll_offset =
DMA_UNROLL_CDM_OFFSET - DMA_REG_OFFSET;
else
imx6_pcie->dma_unroll_offset = 0;
}
if (unlikely(dma_en == 0)) {
test_reg1 = devm_kzalloc(&pdev->dev,
test_region_size, GFP_KERNEL);
if (!test_reg1) {
ret = -ENOMEM;
return ret;
}
test_reg2 = devm_kzalloc(&pdev->dev,
test_region_size, GFP_KERNEL);
if (!test_reg2) {
ret = -ENOMEM;
return ret;
}
}
pcie_arb_base_addr = ioremap_nocache(pp->mem_base,
test_region_size);
if (!pcie_arb_base_addr) {
dev_err(dev, "ioremap error in ep io test\n");
ret = -ENOMEM;
return ret;
}
for (i = 0; i < test_region_size; i = i + 4) {
writel(0xE6600D00 + i, test_reg1 + i);
writel(0xDEADBEAF, test_reg2 + i);
}
/* PCIe EP start the data transfer after link up */
dev_info(dev, "pcie ep: Starting data transfer...\n");
ktime_get_real_ts64(&tv1s);
/* EP write the test region to remote RC's DDR memory */
if (dma_en) {
imx6_pcie_local_dma_start(pp, 0, 0, test_reg1_dma,
imx6_pcie_cpu_addr_fixup(imx6_pcie->pci, pp->mem_base),
test_region_size);
timeout = jiffies + msecs_to_jiffies(300);
do {
udelay(1);
if (time_after(jiffies, timeout)) {
dev_info(dev, "dma write no end ...\n");
break;
}
} while (!dma_w_end);
} else {
memcpy((unsigned int *)pcie_arb_base_addr,
(unsigned int *)test_reg1,
test_region_size);
}
ktime_get_real_ts64(&tv1e);
ktime_get_real_ts64(&tv2s);
/* EP read the test region back from remote RC's DDR memory */
if (dma_en) {
imx6_pcie_local_dma_start(pp, 1, 0,
imx6_pcie_cpu_addr_fixup(imx6_pcie->pci, pp->mem_base),
test_reg2_dma, test_region_size);
timeout = jiffies + msecs_to_jiffies(300);
do {
udelay(1);
if (time_after(jiffies, timeout)) {
dev_info(dev, "dma read no end\n");
break;
}
} while (!dma_r_end);
} else {
memcpy((unsigned int *)test_reg2,
(unsigned int *)pcie_arb_base_addr,
test_region_size);
}
ktime_get_real_ts64(&tv2e);
if (memcmp(test_reg2, test_reg1, test_region_size) == 0) {
tv_count1 = (tv1e.tv_sec - tv1s.tv_sec)
* USEC_PER_SEC
+ (tv1e.tv_nsec - tv1s.tv_nsec) / 1000;
tv_count2 = (tv2e.tv_sec - tv2s.tv_sec)
* USEC_PER_SEC
+ (tv2e.tv_nsec - tv2s.tv_nsec) / 1000;
dev_info(dev, "ep: Data %s transfer is successful.\n",
dma_en ? "DMA" : "PIO");
dev_info(dev, "ep: Data write %dus speed:%ldMB/s.\n",
tv_count1,
((test_region_size/1024)
* MSEC_PER_SEC)
/(tv_count1));
dev_info(dev, "ep: Data read %dus speed:%ldMB/s.\n",
tv_count2,
((test_region_size/1024)
* MSEC_PER_SEC)
/(tv_count2));
} else {
dev_info(dev, "ep: Data transfer is failed.\n");
} /* end of self io test. */
} else {
ret = imx6_add_pcie_port(imx6_pcie, pdev);
if (ret < 0) {
if (IS_ENABLED(CONFIG_PCI_IMX6_COMPLIANCE_TEST)) {
/* The PCIE clocks wouldn't be turned off */
dev_info(dev, "To do the compliance tests.\n");
ret = 0;
} else {
dev_err(dev, "unable to add pcie port.\n");
}
return ret;
}
if (IS_ENABLED(CONFIG_RC_MODE_IN_EP_RC_SYS)
&& (imx6_pcie->hard_wired == 0))
imx6_pcie_regions_setup(&pdev->dev);
/*
* If the L1SS is enabled, disable the over ride after link up.
* Let the the CLK_REQ# controlled by HW L1SS automatically.
*/
ret = imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_L1SS;
if (IS_ENABLED(CONFIG_PCIEASPM_POWER_SUPERSAVE) && (ret > 0)) {
switch (imx6_pcie->drvdata->variant) {
case IMX8MQ:
case IMX8MM:
regmap_update_bits(imx6_pcie->iomuxc_gpr,
imx6_pcie_grp_offset(imx6_pcie),
IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
0);
break;
default:
break;
};
}
}
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 imx6_pcie_drvdata drvdata[] = {
[IMX6Q] = {
.variant = IMX6Q,
.flags = IMX6_PCIE_FLAG_IMX6_PHY |
IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
.dbi_length = 0x200,
},
[IMX6SX] = {
.variant = IMX6SX,
.flags = IMX6_PCIE_FLAG_IMX6_PHY |
IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
},
[IMX6QP] = {
.variant = IMX6QP,
.flags = IMX6_PCIE_FLAG_IMX6_PHY |
IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
},
[IMX7D] = {
.variant = IMX7D,
.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
},
[IMX8MQ] = {
.variant = IMX8MQ,
.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND |
IMX6_PCIE_FLAG_SUPPORTS_L1SS,
},
[IMX8MM] = {
.variant = IMX8MM,
.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND |
IMX6_PCIE_FLAG_SUPPORTS_L1SS,
},
[IMX8QM] = {
.variant = IMX8QM,
.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND |
IMX6_PCIE_FLAG_IMX6_CPU_ADDR_FIXUP,
},
[IMX8QXP] = {
.variant = IMX8QXP,
.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND |
IMX6_PCIE_FLAG_IMX6_CPU_ADDR_FIXUP,
},
};
static const struct of_device_id imx6_pcie_of_match[] = {
{ .compatible = "fsl,imx6q-pcie", .data = &drvdata[IMX6Q], },
{ .compatible = "fsl,imx6sx-pcie", .data = &drvdata[IMX6SX], },
{ .compatible = "fsl,imx6qp-pcie", .data = &drvdata[IMX6QP], },
{ .compatible = "fsl,imx7d-pcie", .data = &drvdata[IMX7D], },
{ .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], },
{ .compatible = "fsl,imx8mm-pcie", .data = &drvdata[IMX8MM], },
{ .compatible = "fsl,imx8qm-pcie", .data = &drvdata[IMX8QM], },
{ .compatible = "fsl,imx8qxp-pcie", .data = &drvdata[IMX8QXP], },
{},
};
static struct platform_driver imx6_pcie_driver = {
.driver = {
.name = "imx6q-pcie",
.of_match_table = imx6_pcie_of_match,
.suppress_bind_attrs = true,
.pm = &imx6_pcie_pm_ops,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = imx6_pcie_probe,
.shutdown = imx6_pcie_shutdown,
};
static void imx6_pcie_quirk(struct pci_dev *dev)
{
struct pci_bus *bus = dev->bus;
struct pcie_port *pp = bus->sysdata;
/* Bus parent is the PCI bridge, its parent is this platform driver */
if (!bus->dev.parent || !bus->dev.parent->parent)
return;
/* Make sure we only quirk devices associated with this driver */
if (bus->dev.parent->parent->driver != &imx6_pcie_driver.driver)
return;
if (bus->number == pp->root_bus_nr) {
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
/*
* Limit config length to avoid the kernel reading beyond
* the register set and causing an abort on i.MX 6Quad
*/
if (imx6_pcie->drvdata->dbi_length) {
dev->cfg_size = imx6_pcie->drvdata->dbi_length;
dev_info(&dev->dev, "Limiting cfg_size to %d\n",
dev->cfg_size);
}
}
}
DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_SYNOPSYS, 0xabcd,
PCI_CLASS_BRIDGE_PCI, 8, imx6_pcie_quirk);
static int __init imx6_pcie_init(void)
{
#ifdef CONFIG_ARM
/*
* Since probe() can be deferred we need to make sure that
* hook_fault_code is not called after __init memory is freed
* by kernel and since imx6q_pcie_abort_handler() is a no-op,
* we can install the handler here without risking it
* accessing some uninitialized driver state.
*/
hook_fault_code(8, imx6q_pcie_abort_handler, SIGBUS, 0,
"external abort on non-linefetch");
#endif
return platform_driver_register(&imx6_pcie_driver);
}
device_initcall(imx6_pcie_init);
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