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arm64: a37xx: pci: add support for aardvark pcie driver

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This patch introduced the Aardvark PCIe driver based
driver model.
The PCIe driver is supposed to work in Root Complex
mode. It only supports X1 lane width.

Signed-off-by: Wilson Ding <dingwei@marvell.com>
Reviewed-on: http://vgitil04.il.marvell.com:8080/38725
Reviewed-by: Victor Gu <xigu@marvell.com>
Reviewed-by: Hua Jing <jinghua@marvell.com>
Tested-by: Hua Jing <jinghua@marvell.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Ken Ma <make@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
master
Wilson Ding 6 years ago committed by Stefan Roese
parent 92e7a6814c
commit e51f2b14c4
3 changed files with 701 additions and 0 deletions
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  1. 10
      drivers/pci/Kconfig
  2. 1
      drivers/pci/Makefile
  3. 690
      drivers/pci/pci-aardvark.c

10
drivers/pci/Kconfig
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@ -26,6 +26,16 @@ config DM_PCI_COMPAT
measure when porting a board to use driver model for PCI. Once the
board is fully supported, this option should be disabled.
config PCI_AARDVARK
bool "Enable Aardvark PCIe driver"
default n
depends on DM_PCI
depends on ARMADA_3700
help
Say Y here if you want to enable PCIe controller support on
Armada37x0 SoCs. The PCIe controller on Armada37x0 is based on
Aardvark hardware.
config PCI_PNP
bool "Enable Plug & Play support for PCI"
depends on PCI || DM_PCI

1
drivers/pci/Makefile
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@ -30,6 +30,7 @@ obj-$(CONFIG_SH4_PCI) += pci_sh4.o
obj-$(CONFIG_SH7751_PCI) +=pci_sh7751.o
obj-$(CONFIG_SH7780_PCI) +=pci_sh7780.o
obj-$(CONFIG_PCI_TEGRA) += pci_tegra.o
obj-$(CONFIG_PCI_AARDVARK) += pci-aardvark.o
obj-$(CONFIG_PCIE_DW_MVEBU) += pcie_dw_mvebu.o
obj-$(CONFIG_PCIE_LAYERSCAPE) += pcie_layerscape.o
obj-$(CONFIG_PCIE_LAYERSCAPE) += pcie_layerscape_fixup.o

690
drivers/pci/pci-aardvark.c
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@ -0,0 +1,690 @@
/*
* ***************************************************************************
* Copyright (C) 2015 Marvell International Ltd.
* ***************************************************************************
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, either version 2 of the License, or any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* ***************************************************************************
*/
/* pcie_advk.c
*
* Ported from Linux driver - driver/pci/host/pci-aardvark.c
*
* Author: Victor Gu <xigu@marvell.com>
* Hezi Shahmoon <hezi.shahmoon@marvell.com>
*
*/
#include <common.h>
#include <dm.h>
#include <pci.h>
#include <asm/io.h>
#include <asm-generic/gpio.h>
#include <linux/ioport.h>
/* PCIe core registers */
#define PCIE_CORE_CMD_STATUS_REG 0x4
#define PCIE_CORE_CMD_IO_ACCESS_EN BIT(0)
#define PCIE_CORE_CMD_MEM_ACCESS_EN BIT(1)
#define PCIE_CORE_CMD_MEM_IO_REQ_EN BIT(2)
#define PCIE_CORE_DEV_CTRL_STATS_REG 0xc8
#define PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE (0 << 4)
#define PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE (0 << 11)
#define PCIE_CORE_LINK_CTRL_STAT_REG 0xd0
#define PCIE_CORE_LINK_TRAINING BIT(5)
#define PCIE_CORE_ERR_CAPCTL_REG 0x118
#define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX BIT(5)
#define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN BIT(6)
#define PCIE_CORE_ERR_CAPCTL_ECRC_CHECK BIT(7)
#define PCIE_CORE_ERR_CAPCTL_ECRC_CHECK_RCV BIT(8)
/* PIO registers base address and register offsets */
#define PIO_BASE_ADDR 0x4000
#define PIO_CTRL (PIO_BASE_ADDR + 0x0)
#define PIO_CTRL_TYPE_MASK GENMASK(3, 0)
#define PIO_CTRL_ADDR_WIN_DISABLE BIT(24)
#define PIO_STAT (PIO_BASE_ADDR + 0x4)
#define PIO_COMPLETION_STATUS_SHIFT 7
#define PIO_COMPLETION_STATUS_MASK GENMASK(9, 7)
#define PIO_COMPLETION_STATUS_OK 0
#define PIO_COMPLETION_STATUS_UR 1
#define PIO_COMPLETION_STATUS_CRS 2
#define PIO_COMPLETION_STATUS_CA 4
#define PIO_NON_POSTED_REQ BIT(10)
#define PIO_ERR_STATUS BIT(11)
#define PIO_ADDR_LS (PIO_BASE_ADDR + 0x8)
#define PIO_ADDR_MS (PIO_BASE_ADDR + 0xc)
#define PIO_WR_DATA (PIO_BASE_ADDR + 0x10)
#define PIO_WR_DATA_STRB (PIO_BASE_ADDR + 0x14)
#define PIO_RD_DATA (PIO_BASE_ADDR + 0x18)
#define PIO_START (PIO_BASE_ADDR + 0x1c)
#define PIO_ISR (PIO_BASE_ADDR + 0x20)
/* Aardvark Control registers */
#define CONTROL_BASE_ADDR 0x4800
#define PCIE_CORE_CTRL0_REG (CONTROL_BASE_ADDR + 0x0)
#define PCIE_GEN_SEL_MSK 0x3
#define PCIE_GEN_SEL_SHIFT 0x0
#define SPEED_GEN_1 0
#define SPEED_GEN_2 1
#define SPEED_GEN_3 2
#define IS_RC_MSK 1
#define IS_RC_SHIFT 2
#define LANE_CNT_MSK 0x18
#define LANE_CNT_SHIFT 0x3
#define LANE_COUNT_1 (0 << LANE_CNT_SHIFT)
#define LANE_COUNT_2 (1 << LANE_CNT_SHIFT)
#define LANE_COUNT_4 (2 << LANE_CNT_SHIFT)
#define LANE_COUNT_8 (3 << LANE_CNT_SHIFT)
#define LINK_TRAINING_EN BIT(6)
#define PCIE_CORE_CTRL2_REG (CONTROL_BASE_ADDR + 0x8)
#define PCIE_CORE_CTRL2_RESERVED 0x7
#define PCIE_CORE_CTRL2_TD_ENABLE BIT(4)
#define PCIE_CORE_CTRL2_STRICT_ORDER_ENABLE BIT(5)
#define PCIE_CORE_CTRL2_ADDRWIN_MAP_ENABLE BIT(6)
/* LMI registers base address and register offsets */
#define LMI_BASE_ADDR 0x6000
#define CFG_REG (LMI_BASE_ADDR + 0x0)
#define LTSSM_SHIFT 24
#define LTSSM_MASK 0x3f
#define LTSSM_L0 0x10
/* PCIe core controller registers */
#define CTRL_CORE_BASE_ADDR 0x18000
#define CTRL_CONFIG_REG (CTRL_CORE_BASE_ADDR + 0x0)
#define CTRL_MODE_SHIFT 0x0
#define CTRL_MODE_MASK 0x1
#define PCIE_CORE_MODE_DIRECT 0x0
#define PCIE_CORE_MODE_COMMAND 0x1
/* Transaction types */
#define PCIE_CONFIG_RD_TYPE0 0x8
#define PCIE_CONFIG_RD_TYPE1 0x9
#define PCIE_CONFIG_WR_TYPE0 0xa
#define PCIE_CONFIG_WR_TYPE1 0xb
/* PCI_BDF shifts 8bit, so we need extra 4bit shift */
#define PCIE_BDF(dev) (dev << 4)
#define PCIE_CONF_BUS(bus) (((bus) & 0xff) << 20)
#define PCIE_CONF_DEV(dev) (((dev) & 0x1f) << 15)
#define PCIE_CONF_FUNC(fun) (((fun) & 0x7) << 12)
#define PCIE_CONF_REG(reg) ((reg) & 0xffc)
#define PCIE_CONF_ADDR(bus, devfn, where) \
(PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where))
/* PCIe Retries & Timeout definitions */
#define MAX_RETRIES 10
#define PIO_WAIT_TIMEOUT 100
#define LINK_WAIT_TIMEOUT 100000
#define CFG_RD_UR_VAL 0xFFFFFFFF
#define CFG_RD_CRS_VAL 0xFFFF0001
DECLARE_GLOBAL_DATA_PTR;
/**
* struct pcie_advk - Advk PCIe controller state
*
* @reg_base: The base address of the register space.
* @first_busno: This driver supports multiple PCIe controllers.
* first_busno stores the bus number of the PCIe root-port
* number which may vary depending on the PCIe setup
* (PEX switches etc).
* @device: The pointer to PCI uclass device.
*/
struct pcie_advk {
void *base;
int first_busno;
struct udevice *dev;
};
static inline void advk_writel(struct pcie_advk *pcie, uint val, uint reg)
{
writel(val, pcie->base + reg);
}
static inline uint advk_readl(struct pcie_advk *pcie, uint reg)
{
return readl(pcie->base + reg);
}
/**
* pcie_advk_addr_valid() - Check for valid bus address
*
* @bdf: The PCI device to access
* @first_busno: Bus number of the PCIe controller root complex
*
* Return: 1 on valid, 0 on invalid
*/
static int pcie_advk_addr_valid(pci_dev_t bdf, int first_busno)
{
/*
* In PCIE-E only a single device (0) can exist
* on the local bus. Beyound the local bus, there might be
* a Switch and everything is possible.
*/
if ((PCI_BUS(bdf) == first_busno) && (PCI_DEV(bdf) > 0))
return 0;
return 1;
}
/**
* pcie_advk_wait_pio() - Wait for PIO access to be accomplished
*
* @pcie: The PCI device to access
*
* Wait up to 1 micro second for PIO access to be accomplished.
*
* Return 1 (true) if PIO access is accomplished.
* Return 0 (false) if PIO access is timed out.
*/
static int pcie_advk_wait_pio(struct pcie_advk *pcie)
{
uint start, isr;
uint count;
for (count = 0; count < MAX_RETRIES; count++) {
start = advk_readl(pcie, PIO_START);
isr = advk_readl(pcie, PIO_ISR);
if (!start && isr)
return 1;
/*
* Do not check the PIO state too frequently,
* 100us delay is appropriate.
*/
udelay(PIO_WAIT_TIMEOUT);
}
dev_err(pcie->dev, "config read/write timed out\n");
return 0;
}
/**
* pcie_advk_check_pio_status() - Validate PIO status and get the read result
*
* @pcie: Pointer to the PCI bus
* @read: Read from or write to configuration space - true(read) false(write)
* @read_val: Pointer to the read result, only valid when read is true
*
*/
static int pcie_advk_check_pio_status(struct pcie_advk *pcie,
bool read,
uint *read_val)
{
uint reg;
unsigned int status;
char *strcomp_status, *str_posted;
reg = advk_readl(pcie, PIO_STAT);
status = (reg & PIO_COMPLETION_STATUS_MASK) >>
PIO_COMPLETION_STATUS_SHIFT;
switch (status) {
case PIO_COMPLETION_STATUS_OK:
if (reg & PIO_ERR_STATUS) {
strcomp_status = "COMP_ERR";
break;
}
/* Get the read result */
if (read)
*read_val = advk_readl(pcie, PIO_RD_DATA);
/* No error */
strcomp_status = NULL;
break;
case PIO_COMPLETION_STATUS_UR:
if (read) {
/* For reading, UR is not an error status. */
*read_val = CFG_RD_UR_VAL;
strcomp_status = NULL;
} else {
strcomp_status = "UR";
}
break;
case PIO_COMPLETION_STATUS_CRS:
if (read) {
/* For reading, CRS is not an error status. */
*read_val = CFG_RD_CRS_VAL;
strcomp_status = NULL;
} else {
strcomp_status = "CRS";
}
break;
case PIO_COMPLETION_STATUS_CA:
strcomp_status = "CA";
break;
default:
strcomp_status = "Unknown";
break;
}
if (!strcomp_status)
return 0;
if (reg & PIO_NON_POSTED_REQ)
str_posted = "Non-posted";
else
str_posted = "Posted";
dev_err(pcie->dev, "%s PIO Response Status: %s, %#x @ %#x\n",
str_posted, strcomp_status, reg,
advk_readl(pcie, PIO_ADDR_LS));
return -EFAULT;
}
/**
* pcie_advk_read_config() - Read from configuration space
*
* @bus: Pointer to the PCI bus
* @bdf: Identifies the PCIe device to access
* @offset: The offset into the device's configuration space
* @valuep: A pointer at which to store the read value
* @size: Indicates the size of access to perform
*
* Read a value of size @size from offset @offset within the configuration
* space of the device identified by the bus, device & function numbers in @bdf
* on the PCI bus @bus.
*
* Return: 0 on success
*/
static int pcie_advk_read_config(struct udevice *bus, pci_dev_t bdf,
uint offset, ulong *valuep,
enum pci_size_t size)
{
struct pcie_advk *pcie = dev_get_priv(bus);
uint reg;
int ret;
dev_dbg(pcie->dev, "PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
if (!pcie_advk_addr_valid(bdf, pcie->first_busno)) {
dev_dbg(pcie->dev, "- out of range\n");
*valuep = pci_get_ff(size);
return 0;
}
/* Start PIO */
advk_writel(pcie, 0, PIO_START);
advk_writel(pcie, 1, PIO_ISR);
/* Program the control register */
reg = advk_readl(pcie, PIO_CTRL);
reg &= ~PIO_CTRL_TYPE_MASK;
if (PCI_BUS(bdf) == pcie->first_busno)
reg |= PCIE_CONFIG_RD_TYPE0;
else
reg |= PCIE_CONFIG_RD_TYPE1;
advk_writel(pcie, reg, PIO_CTRL);
/* Program the address registers */
reg = PCIE_BDF(bdf) | PCIE_CONF_REG(offset);
advk_writel(pcie, reg, PIO_ADDR_LS);
advk_writel(pcie, 0, PIO_ADDR_MS);
/* Start the transfer */
advk_writel(pcie, 1, PIO_START);
if (!pcie_advk_wait_pio(pcie))
return -EINVAL;
/* Check PIO status and get the read result */
ret = pcie_advk_check_pio_status(pcie, true, &reg);
if (ret)
return ret;
dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08x)\n",
offset, size, reg);
*valuep = pci_conv_32_to_size(reg, offset, size);
return 0;
}
/**
* pcie_calc_datastrobe() - Calculate data strobe
*
* @offset: The offset into the device's configuration space
* @size: Indicates the size of access to perform
*
* Calculate data strobe according to offset and size
*
*/
static uint pcie_calc_datastrobe(uint offset, enum pci_size_t size)
{
uint bytes, data_strobe;
switch (size) {
case PCI_SIZE_8:
bytes = 1;
break;
case PCI_SIZE_16:
bytes = 2;
break;
default:
bytes = 4;
}
data_strobe = GENMASK(bytes - 1, 0) << (offset & 0x3);
return data_strobe;
}
/**
* pcie_advk_write_config() - Write to configuration space
*
* @bus: Pointer to the PCI bus
* @bdf: Identifies the PCIe device to access
* @offset: The offset into the device's configuration space
* @value: The value to write
* @size: Indicates the size of access to perform
*
* Write the value @value of size @size from offset @offset within the
* configuration space of the device identified by the bus, device & function
* numbers in @bdf on the PCI bus @bus.
*
* Return: 0 on success
*/
static int pcie_advk_write_config(struct udevice *bus, pci_dev_t bdf,
uint offset, ulong value,
enum pci_size_t size)
{
struct pcie_advk *pcie = dev_get_priv(bus);
uint reg;
dev_dbg(pcie->dev, "PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08lx)\n",
offset, size, value);
if (!pcie_advk_addr_valid(bdf, pcie->first_busno)) {
dev_dbg(pcie->dev, "- out of range\n");
return 0;
}
/* Start PIO */
advk_writel(pcie, 0, PIO_START);
advk_writel(pcie, 1, PIO_ISR);
/* Program the control register */
reg = advk_readl(pcie, PIO_CTRL);
reg &= ~PIO_CTRL_TYPE_MASK;
if (PCI_BUS(bdf) == pcie->first_busno)
reg |= PCIE_CONFIG_WR_TYPE0;
else
reg |= PCIE_CONFIG_WR_TYPE1;
advk_writel(pcie, reg, PIO_CTRL);
/* Program the address registers */
reg = PCIE_BDF(bdf) | PCIE_CONF_REG(offset);
advk_writel(pcie, reg, PIO_ADDR_LS);
advk_writel(pcie, 0, PIO_ADDR_MS);
dev_dbg(pcie->dev, "\tPIO req. - addr = 0x%08x\n", reg);
/* Program the data register */
reg = pci_conv_size_to_32(0, value, offset, size);
advk_writel(pcie, reg, PIO_WR_DATA);
dev_dbg(pcie->dev, "\tPIO req. - val = 0x%08x\n", reg);
/* Program the data strobe */
reg = pcie_calc_datastrobe(offset, size);
advk_writel(pcie, reg, PIO_WR_DATA_STRB);
dev_dbg(pcie->dev, "\tPIO req. - strb = 0x%02x\n", reg);
/* Start the transfer */
advk_writel(pcie, 1, PIO_START);
if (!pcie_advk_wait_pio(pcie)) {
dev_dbg(pcie->dev, "- wait pio timeout\n");
return -EINVAL;
}
/* Check PIO status */
pcie_advk_check_pio_status(pcie, false, &reg);
return 0;
}
/**
* pcie_advk_link_up() - Check if PCIe link is up or not
*
* @pcie: The PCI device to access
*
* Return 1 (true) on link up.
* Return 0 (false) on link down.
*/
static int pcie_advk_link_up(struct pcie_advk *pcie)
{
u32 val, ltssm_state;
val = advk_readl(pcie, CFG_REG);
ltssm_state = (val >> LTSSM_SHIFT) & LTSSM_MASK;
return ltssm_state >= LTSSM_L0;
}
/**
* pcie_advk_wait_for_link() - Wait for link training to be accomplished
*
* @pcie: The PCI device to access
*
* Wait up to 1 second for link training to be accomplished.
*
* Return 1 (true) if link training ends up with link up success.
* Return 0 (false) if link training ends up with link up failure.
*/
static int pcie_advk_wait_for_link(struct pcie_advk *pcie)
{
int retries;
/* check if the link is up or not */
for (retries = 0; retries < MAX_RETRIES; retries++) {
if (pcie_advk_link_up(pcie)) {
printf("PCIE-%d: Link up\n", pcie->first_busno);
return 0;
}
udelay(LINK_WAIT_TIMEOUT);
}
printf("PCIE-%d: Link down\n", pcie->first_busno);
return -ETIMEDOUT;
}
/**
* pcie_advk_setup_hw() - PCIe initailzation
*
* @pcie: The PCI device to access
*
* Return: 0 on success
*/
static int pcie_advk_setup_hw(struct pcie_advk *pcie)
{
u32 reg;
/* Set to Direct mode */
reg = advk_readl(pcie, CTRL_CONFIG_REG);
reg &= ~(CTRL_MODE_MASK << CTRL_MODE_SHIFT);
reg |= ((PCIE_CORE_MODE_DIRECT & CTRL_MODE_MASK) << CTRL_MODE_SHIFT);
advk_writel(pcie, reg, CTRL_CONFIG_REG);
/* Set PCI global control register to RC mode */
reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
reg |= (IS_RC_MSK << IS_RC_SHIFT);
advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
/* Set Advanced Error Capabilities and Control PF0 register */
reg = PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX |
PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN |
PCIE_CORE_ERR_CAPCTL_ECRC_CHECK |
PCIE_CORE_ERR_CAPCTL_ECRC_CHECK_RCV;
advk_writel(pcie, reg, PCIE_CORE_ERR_CAPCTL_REG);
/* Set PCIe Device Control and Status 1 PF0 register */
reg = PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE |
PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE;
advk_writel(pcie, reg, PCIE_CORE_DEV_CTRL_STATS_REG);
/* Program PCIe Control 2 to disable strict ordering */
reg = PCIE_CORE_CTRL2_RESERVED |
PCIE_CORE_CTRL2_TD_ENABLE;
advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
/* Set GEN2 */
reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
reg &= ~PCIE_GEN_SEL_MSK;
reg |= SPEED_GEN_2;
advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
/* Set lane X1 */
reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
reg &= ~LANE_CNT_MSK;
reg |= LANE_COUNT_1;
advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
/* Enable link training */
reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
reg |= LINK_TRAINING_EN;
advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
/*
* Enable AXI address window location generation:
* When it is enabled, the default outbound window
* configurations (Default User Field: 0xD0074CFC)
* are used to transparent address translation for
* the outbound transactions. Thus, PCIe address
* windows are not required.
*/
reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG);
reg |= PCIE_CORE_CTRL2_ADDRWIN_MAP_ENABLE;
advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
/*
* Bypass the address window mapping for PIO:
* Since PIO access already contains all required
* info over AXI interface by PIO registers, the
* address window is not required.
*/
reg = advk_readl(pcie, PIO_CTRL);
reg |= PIO_CTRL_ADDR_WIN_DISABLE;
advk_writel(pcie, reg, PIO_CTRL);
/* Start link training */
reg = advk_readl(pcie, PCIE_CORE_LINK_CTRL_STAT_REG);
reg |= PCIE_CORE_LINK_TRAINING;
advk_writel(pcie, reg, PCIE_CORE_LINK_CTRL_STAT_REG);
/* Wait for PCIe link up */
if (pcie_advk_wait_for_link(pcie))
return -ENXIO;
reg = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG);
reg |= PCIE_CORE_CMD_MEM_ACCESS_EN |
PCIE_CORE_CMD_IO_ACCESS_EN |
PCIE_CORE_CMD_MEM_IO_REQ_EN;
advk_writel(pcie, reg, PCIE_CORE_CMD_STATUS_REG);
return 0;
}
/**
* pcie_advk_probe() - Probe the PCIe bus for active link
*
* @dev: A pointer to the device being operated on
*
* Probe for an active link on the PCIe bus and configure the controller
* to enable this port.
*
* Return: 0 on success, else -ENODEV
*/
static int pcie_advk_probe(struct udevice *dev)
{
struct pcie_advk *pcie = dev_get_priv(dev);
#ifdef CONFIG_DM_GPIO
struct gpio_desc reset_gpio;
gpio_request_by_name(dev, "reset-gpio", 0, &reset_gpio,
GPIOD_IS_OUT);
/*
* Issue reset to add-in card through the dedicated GPIO.
* Some boards are connecting the card reset pin to common system
* reset wire and others are using separate GPIO port.
* In the last case we have to release a reset of the addon card
* using this GPIO.
*
* FIX-ME:
* The PCIe RESET signal is not supposed to be released along
* with the SOC RESET signal. It should be lowered as early as
* possible before PCIe PHY initialization. Moreover, the PCIe
* clock should be gated as well.
*/
if (dm_gpio_is_valid(&reset_gpio)) {
dev_dbg(pcie->dev, "Toggle PCIE Reset GPIO ...\n");
dm_gpio_set_value(&reset_gpio, 0);
mdelay(200);
dm_gpio_set_value(&reset_gpio, 1);
}
#else
dev_dbg(pcie->dev, "PCIE Reset on GPIO support is missing\n");
#endif /* CONFIG_DM_GPIO */
pcie->first_busno = dev->seq;
pcie->dev = pci_get_controller(dev);
return pcie_advk_setup_hw(pcie);
}
/**
* pcie_advk_ofdata_to_platdata() - Translate from DT to device state
*
* @dev: A pointer to the device being operated on
*
* Translate relevant data from the device tree pertaining to device @dev into
* state that the driver will later make use of. This state is stored in the
* device's private data structure.
*
* Return: 0 on success, else -EINVAL
*/
static int pcie_advk_ofdata_to_platdata(struct udevice *dev)
{
struct pcie_advk *pcie = dev_get_priv(dev);
/* Get the register base address */
pcie->base = (void *)dev_read_addr_index(dev, 0);
if ((fdt_addr_t)pcie->base == FDT_ADDR_T_NONE)
return -EINVAL;
return 0;
}
static const struct dm_pci_ops pcie_advk_ops = {
.read_config = pcie_advk_read_config,
.write_config = pcie_advk_write_config,
};
static const struct udevice_id pcie_advk_ids[] = {
{ .compatible = "marvell,armada-37xx-pcie" },
{ }
};
U_BOOT_DRIVER(pcie_advk) = {
.name = "pcie_advk",
.id = UCLASS_PCI,
.of_match = pcie_advk_ids,
.ops = &pcie_advk_ops,
.ofdata_to_platdata = pcie_advk_ofdata_to_platdata,
.probe = pcie_advk_probe,
.priv_auto_alloc_size = sizeof(struct pcie_advk),
};
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