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u-boot/drivers/pci/pcie_brcmstb.c
Nicolas Saenz Julienne c709243ee0 pci: pcie-brcmstb: Fix inbound window configurations 
So far we've assumed a fixed configuration for inbound windows as we had
a single user for this controller. But the controller's DMA constraints
were improved starting with BCM2711's B1 revision of the SoC, notably
available in CM4 and Pi400. They allow for wider inbound windows. We can
now cover the whole address space, whereas before we where limited to
the lower 3GB.

This information is passed to us through DT's 'dma-ranges' property and
it's specially important for us to honor it since some interactions with
the board's co-processor assume we're doing so (specifically the XHCI
firmware load operation, which is handled by the co-processor after
u-boot has correctly configured the PCIe controller).

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
2021-02-18 11:56:25 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Broadcom STB PCIe controller driver
*
* Copyright (C) 2020 Samsung Electronics Co., Ltd.
*
* Based on upstream Linux kernel driver:
* drivers/pci/controller/pcie-brcmstb.c
* Copyright (C) 2009 - 2017 Broadcom
*
* Based driver by Nicolas Saenz Julienne
* Copyright (C) 2020 Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
*/
#include <common.h>
#include <errno.h>
#include <dm.h>
#include <dm/ofnode.h>
#include <pci.h>
#include <asm/io.h>
#include <linux/bitfield.h>
#include <linux/log2.h>
#include <linux/iopoll.h>
/* Offset of the mandatory PCIe capability config registers */
#define BRCM_PCIE_CAP_REGS 0x00ac
/* The PCIe controller register offsets */
#define PCIE_RC_CFG_VENDOR_SPECIFIC_REG1 0x0188
#define VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK 0xc
#define VENDOR_SPECIFIC_REG1_LITTLE_ENDIAN 0x0
#define PCIE_RC_CFG_PRIV1_ID_VAL3 0x043c
#define CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK 0xffffff
#define PCIE_RC_DL_MDIO_ADDR 0x1100
#define PCIE_RC_DL_MDIO_WR_DATA 0x1104
#define PCIE_RC_DL_MDIO_RD_DATA 0x1108
#define PCIE_MISC_MISC_CTRL 0x4008
#define MISC_CTRL_SCB_ACCESS_EN_MASK 0x1000
#define MISC_CTRL_CFG_READ_UR_MODE_MASK 0x2000
#define MISC_CTRL_MAX_BURST_SIZE_MASK 0x300000
#define MISC_CTRL_MAX_BURST_SIZE_128 0x0
#define MISC_CTRL_SCB0_SIZE_MASK 0xf8000000
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO 0x400c
#define PCIE_MEM_WIN0_LO(win) \
PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + ((win) * 4)
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI 0x4010
#define PCIE_MEM_WIN0_HI(win) \
PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + ((win) * 4)
#define PCIE_MISC_RC_BAR1_CONFIG_LO 0x402c
#define RC_BAR1_CONFIG_LO_SIZE_MASK 0x1f
#define PCIE_MISC_RC_BAR2_CONFIG_LO 0x4034
#define RC_BAR2_CONFIG_LO_SIZE_MASK 0x1f
#define PCIE_MISC_RC_BAR2_CONFIG_HI 0x4038
#define PCIE_MISC_RC_BAR3_CONFIG_LO 0x403c
#define RC_BAR3_CONFIG_LO_SIZE_MASK 0x1f
#define PCIE_MISC_PCIE_STATUS 0x4068
#define STATUS_PCIE_PORT_MASK 0x80
#define STATUS_PCIE_PORT_SHIFT 7
#define STATUS_PCIE_DL_ACTIVE_MASK 0x20
#define STATUS_PCIE_DL_ACTIVE_SHIFT 5
#define STATUS_PCIE_PHYLINKUP_MASK 0x10
#define STATUS_PCIE_PHYLINKUP_SHIFT 4
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT 0x4070
#define MEM_WIN0_BASE_LIMIT_LIMIT_MASK 0xfff00000
#define MEM_WIN0_BASE_LIMIT_BASE_MASK 0xfff0
#define MEM_WIN0_BASE_LIMIT_BASE_HI_SHIFT 12
#define PCIE_MEM_WIN0_BASE_LIMIT(win) \
PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT + ((win) * 4)
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI 0x4080
#define MEM_WIN0_BASE_HI_BASE_MASK 0xff
#define PCIE_MEM_WIN0_BASE_HI(win) \
PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI + ((win) * 8)
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI 0x4084
#define PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK 0xff
#define PCIE_MEM_WIN0_LIMIT_HI(win) \
PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI + ((win) * 8)
#define PCIE_MISC_HARD_PCIE_HARD_DEBUG 0x4204
#define PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2
#define PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x08000000
#define PCIE_MSI_INTR2_CLR 0x4508
#define PCIE_MSI_INTR2_MASK_SET 0x4510
#define PCIE_EXT_CFG_DATA 0x8000
#define PCIE_EXT_CFG_INDEX 0x9000
#define PCIE_EXT_BUSNUM_SHIFT 20
#define PCIE_EXT_SLOT_SHIFT 15
#define PCIE_EXT_FUNC_SHIFT 12
#define PCIE_RGR1_SW_INIT_1 0x9210
#define RGR1_SW_INIT_1_PERST_MASK 0x1
#define RGR1_SW_INIT_1_INIT_MASK 0x2
/* PCIe parameters */
#define BRCM_NUM_PCIE_OUT_WINS 4
/* MDIO registers */
#define MDIO_PORT0 0x0
#define MDIO_DATA_MASK 0x7fffffff
#define MDIO_DATA_SHIFT 0
#define MDIO_PORT_MASK 0xf0000
#define MDIO_PORT_SHIFT 16
#define MDIO_REGAD_MASK 0xffff
#define MDIO_REGAD_SHIFT 0
#define MDIO_CMD_MASK 0xfff00000
#define MDIO_CMD_SHIFT 20
#define MDIO_CMD_READ 0x1
#define MDIO_CMD_WRITE 0x0
#define MDIO_DATA_DONE_MASK 0x80000000
#define SSC_REGS_ADDR 0x1100
#define SET_ADDR_OFFSET 0x1f
#define SSC_CNTL_OFFSET 0x2
#define SSC_CNTL_OVRD_EN_MASK 0x8000
#define SSC_CNTL_OVRD_VAL_MASK 0x4000
#define SSC_STATUS_OFFSET 0x1
#define SSC_STATUS_SSC_MASK 0x400
#define SSC_STATUS_SSC_SHIFT 10
#define SSC_STATUS_PLL_LOCK_MASK 0x800
#define SSC_STATUS_PLL_LOCK_SHIFT 11
/**
* struct brcm_pcie - the PCIe controller state
* @base: Base address of memory mapped IO registers of the controller
* @gen: Non-zero value indicates limitation of the PCIe controller operation
* to a specific generation (1, 2 or 3)
* @ssc: true indicates active Spread Spectrum Clocking operation
*/
struct brcm_pcie {
void __iomem *base;
int gen;
bool ssc;
};
/**
* brcm_pcie_encode_ibar_size() - Encode the inbound "BAR" region size
* @size: The inbound region size
*
* This function converts size of the inbound "BAR" region to the non-linear
* values of the PCIE_MISC_RC_BAR[123]_CONFIG_LO register SIZE field.
*
* Return: The encoded inbound region size
*/
static int brcm_pcie_encode_ibar_size(u64 size)
{
int log2_in = ilog2(size);
if (log2_in >= 12 && log2_in <= 15)
/* Covers 4KB to 32KB (inclusive) */
return (log2_in - 12) + 0x1c;
else if (log2_in >= 16 && log2_in <= 37)
/* Covers 64KB to 32GB, (inclusive) */
return log2_in - 15;
/* Something is awry so disable */
return 0;
}
/**
* brcm_pcie_rc_mode() - Check if PCIe controller is in RC mode
* @pcie: Pointer to the PCIe controller state
*
* The controller is capable of serving in both RC and EP roles.
*
* Return: true for RC mode, false for EP mode.
*/
static bool brcm_pcie_rc_mode(struct brcm_pcie *pcie)
{
u32 val;
val = readl(pcie->base + PCIE_MISC_PCIE_STATUS);
return (val & STATUS_PCIE_PORT_MASK) >> STATUS_PCIE_PORT_SHIFT;
}
/**
* brcm_pcie_link_up() - Check whether the PCIe link is up
* @pcie: Pointer to the PCIe controller state
*
* Return: true if the link is up, false otherwise.
*/
static bool brcm_pcie_link_up(struct brcm_pcie *pcie)
{
u32 val, dla, plu;
val = readl(pcie->base + PCIE_MISC_PCIE_STATUS);
dla = (val & STATUS_PCIE_DL_ACTIVE_MASK) >> STATUS_PCIE_DL_ACTIVE_SHIFT;
plu = (val & STATUS_PCIE_PHYLINKUP_MASK) >> STATUS_PCIE_PHYLINKUP_SHIFT;
return dla && plu;
}
static int brcm_pcie_config_address(const struct udevice *dev, pci_dev_t bdf,
uint offset, void **paddress)
{
struct brcm_pcie *pcie = dev_get_priv(dev);
unsigned int pci_bus = PCI_BUS(bdf);
unsigned int pci_dev = PCI_DEV(bdf);
unsigned int pci_func = PCI_FUNC(bdf);
int idx;
/*
* Busses 0 (host PCIe bridge) and 1 (its immediate child)
* are limited to a single device each
*/
if (pci_bus < 2 && pci_dev > 0)
return -EINVAL;
/* Accesses to the RC go right to the RC registers */
if (pci_bus == 0) {
*paddress = pcie->base + offset;
return 0;
}
/* For devices, write to the config space index register */
idx = (pci_bus << PCIE_EXT_BUSNUM_SHIFT)
| (pci_dev << PCIE_EXT_SLOT_SHIFT)
| (pci_func << PCIE_EXT_FUNC_SHIFT);
writel(idx, pcie->base + PCIE_EXT_CFG_INDEX);
*paddress = pcie->base + PCIE_EXT_CFG_DATA + offset;
return 0;
}
static int brcm_pcie_read_config(const struct udevice *bus, pci_dev_t bdf,
uint offset, ulong *valuep,
enum pci_size_t size)
{
return pci_generic_mmap_read_config(bus, brcm_pcie_config_address,
bdf, offset, valuep, size);
}
static int brcm_pcie_write_config(struct udevice *bus, pci_dev_t bdf,
uint offset, ulong value,
enum pci_size_t size)
{
return pci_generic_mmap_write_config(bus, brcm_pcie_config_address,
bdf, offset, value, size);
}
static const char *link_speed_to_str(unsigned int cls)
{
switch (cls) {
case PCI_EXP_LNKSTA_CLS_2_5GB: return "2.5";
case PCI_EXP_LNKSTA_CLS_5_0GB: return "5.0";
case PCI_EXP_LNKSTA_CLS_8_0GB: return "8.0";
default:
break;
}
return "??";
}
static u32 brcm_pcie_mdio_form_pkt(unsigned int port, unsigned int regad,
unsigned int cmd)
{
u32 pkt;
pkt = (port << MDIO_PORT_SHIFT) & MDIO_PORT_MASK;
pkt |= (regad << MDIO_REGAD_SHIFT) & MDIO_REGAD_MASK;
pkt |= (cmd << MDIO_CMD_SHIFT) & MDIO_CMD_MASK;
return pkt;
}
/**
* brcm_pcie_mdio_read() - Perform a register read on the internal MDIO bus
* @base: Pointer to the PCIe controller IO registers
* @port: The MDIO port number
* @regad: The register address
* @val: A pointer at which to store the read value
*
* Return: 0 on success and register value in @val, negative error value
* on failure.
*/
static int brcm_pcie_mdio_read(void __iomem *base, unsigned int port,
unsigned int regad, u32 *val)
{
u32 data, addr;
int ret;
addr = brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_READ);
writel(addr, base + PCIE_RC_DL_MDIO_ADDR);
readl(base + PCIE_RC_DL_MDIO_ADDR);
ret = readl_poll_timeout(base + PCIE_RC_DL_MDIO_RD_DATA, data,
(data & MDIO_DATA_DONE_MASK), 100);
*val = data & MDIO_DATA_MASK;
return ret;
}
/**
* brcm_pcie_mdio_write() - Perform a register write on the internal MDIO bus
* @base: Pointer to the PCIe controller IO registers
* @port: The MDIO port number
* @regad: Address of the register
* @wrdata: The value to write
*
* Return: 0 on success, negative error value on failure.
*/
static int brcm_pcie_mdio_write(void __iomem *base, unsigned int port,
unsigned int regad, u16 wrdata)
{
u32 data, addr;
addr = brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_WRITE);
writel(addr, base + PCIE_RC_DL_MDIO_ADDR);
readl(base + PCIE_RC_DL_MDIO_ADDR);
writel(MDIO_DATA_DONE_MASK | wrdata, base + PCIE_RC_DL_MDIO_WR_DATA);
return readl_poll_timeout(base + PCIE_RC_DL_MDIO_WR_DATA, data,
!(data & MDIO_DATA_DONE_MASK), 100);
}
/**
* brcm_pcie_set_ssc() - Configure the controller for Spread Spectrum Clocking
* @base: pointer to the PCIe controller IO registers
*
* Return: 0 on success, negative error value on failure.
*/
static int brcm_pcie_set_ssc(void __iomem *base)
{
int pll, ssc;
int ret;
u32 tmp;
ret = brcm_pcie_mdio_write(base, MDIO_PORT0, SET_ADDR_OFFSET,
SSC_REGS_ADDR);
if (ret < 0)
return ret;
ret = brcm_pcie_mdio_read(base, MDIO_PORT0, SSC_CNTL_OFFSET, &tmp);
if (ret < 0)
return ret;
tmp |= (SSC_CNTL_OVRD_EN_MASK | SSC_CNTL_OVRD_VAL_MASK);
ret = brcm_pcie_mdio_write(base, MDIO_PORT0, SSC_CNTL_OFFSET, tmp);
if (ret < 0)
return ret;
udelay(1000);
ret = brcm_pcie_mdio_read(base, MDIO_PORT0, SSC_STATUS_OFFSET, &tmp);
if (ret < 0)
return ret;
ssc = (tmp & SSC_STATUS_SSC_MASK) >> SSC_STATUS_SSC_SHIFT;
pll = (tmp & SSC_STATUS_PLL_LOCK_MASK) >> SSC_STATUS_PLL_LOCK_SHIFT;
return ssc && pll ? 0 : -EIO;
}
/**
* brcm_pcie_set_gen() - Limits operation to a specific generation (1, 2 or 3)
* @pcie: pointer to the PCIe controller state
* @gen: PCIe generation to limit the controller's operation to
*/
static void brcm_pcie_set_gen(struct brcm_pcie *pcie, unsigned int gen)
{
void __iomem *cap_base = pcie->base + BRCM_PCIE_CAP_REGS;
u16 lnkctl2 = readw(cap_base + PCI_EXP_LNKCTL2);
u32 lnkcap = readl(cap_base + PCI_EXP_LNKCAP);
lnkcap = (lnkcap & ~PCI_EXP_LNKCAP_SLS) | gen;
writel(lnkcap, cap_base + PCI_EXP_LNKCAP);
lnkctl2 = (lnkctl2 & ~0xf) | gen;
writew(lnkctl2, cap_base + PCI_EXP_LNKCTL2);
}
static void brcm_pcie_set_outbound_win(struct brcm_pcie *pcie,
unsigned int win, u64 phys_addr,
u64 pcie_addr, u64 size)
{
void __iomem *base = pcie->base;
u32 phys_addr_mb_high, limit_addr_mb_high;
phys_addr_t phys_addr_mb, limit_addr_mb;
int high_addr_shift;
u32 tmp;
/* Set the base of the pcie_addr window */
writel(lower_32_bits(pcie_addr), base + PCIE_MEM_WIN0_LO(win));
writel(upper_32_bits(pcie_addr), base + PCIE_MEM_WIN0_HI(win));
/* Write the addr base & limit lower bits (in MBs) */
phys_addr_mb = phys_addr / SZ_1M;
limit_addr_mb = (phys_addr + size - 1) / SZ_1M;
tmp = readl(base + PCIE_MEM_WIN0_BASE_LIMIT(win));
u32p_replace_bits(&tmp, phys_addr_mb,
MEM_WIN0_BASE_LIMIT_BASE_MASK);
u32p_replace_bits(&tmp, limit_addr_mb,
MEM_WIN0_BASE_LIMIT_LIMIT_MASK);
writel(tmp, base + PCIE_MEM_WIN0_BASE_LIMIT(win));
/* Write the cpu & limit addr upper bits */
high_addr_shift = MEM_WIN0_BASE_LIMIT_BASE_HI_SHIFT;
phys_addr_mb_high = phys_addr_mb >> high_addr_shift;
tmp = readl(base + PCIE_MEM_WIN0_BASE_HI(win));
u32p_replace_bits(&tmp, phys_addr_mb_high,
MEM_WIN0_BASE_HI_BASE_MASK);
writel(tmp, base + PCIE_MEM_WIN0_BASE_HI(win));
limit_addr_mb_high = limit_addr_mb >> high_addr_shift;
tmp = readl(base + PCIE_MEM_WIN0_LIMIT_HI(win));
u32p_replace_bits(&tmp, limit_addr_mb_high,
PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK);
writel(tmp, base + PCIE_MEM_WIN0_LIMIT_HI(win));
}
static int brcm_pcie_probe(struct udevice *dev)
{
struct udevice *ctlr = pci_get_controller(dev);
struct pci_controller *hose = dev_get_uclass_priv(ctlr);
struct brcm_pcie *pcie = dev_get_priv(dev);
void __iomem *base = pcie->base;
struct pci_region region;
bool ssc_good = false;
int num_out_wins = 0;
u64 rc_bar2_offset, rc_bar2_size;
unsigned int scb_size_val;
int i, ret;
u16 nlw, cls, lnksta;
u32 tmp;
/*
* Reset the bridge, assert the fundamental reset. Note for some SoCs,
* e.g. BCM7278, the fundamental reset should not be asserted here.
* This will need to be changed when support for other SoCs is added.
*/
setbits_le32(base + PCIE_RGR1_SW_INIT_1,
RGR1_SW_INIT_1_INIT_MASK | RGR1_SW_INIT_1_PERST_MASK);
/*
* The delay is a safety precaution to preclude the reset signal
* from looking like a glitch.
*/
udelay(100);
/* Take the bridge out of reset */
clrbits_le32(base + PCIE_RGR1_SW_INIT_1, RGR1_SW_INIT_1_INIT_MASK);
clrbits_le32(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG,
PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
/* Wait for SerDes to be stable */
udelay(100);
/* Set SCB_MAX_BURST_SIZE, CFG_READ_UR_MODE, SCB_ACCESS_EN */
clrsetbits_le32(base + PCIE_MISC_MISC_CTRL,
MISC_CTRL_MAX_BURST_SIZE_MASK,
MISC_CTRL_SCB_ACCESS_EN_MASK |
MISC_CTRL_CFG_READ_UR_MODE_MASK |
MISC_CTRL_MAX_BURST_SIZE_128);
pci_get_dma_regions(dev, &region, 0);
rc_bar2_offset = region.bus_start - region.phys_start;
rc_bar2_size = 1ULL << fls64(region.size - 1);
tmp = lower_32_bits(rc_bar2_offset);
u32p_replace_bits(&tmp, brcm_pcie_encode_ibar_size(rc_bar2_size),
RC_BAR2_CONFIG_LO_SIZE_MASK);
writel(tmp, base + PCIE_MISC_RC_BAR2_CONFIG_LO);
writel(upper_32_bits(rc_bar2_offset),
base + PCIE_MISC_RC_BAR2_CONFIG_HI);
scb_size_val = rc_bar2_size ?
ilog2(rc_bar2_size) - 15 : 0xf; /* 0xf is 1GB */
tmp = readl(base + PCIE_MISC_MISC_CTRL);
u32p_replace_bits(&tmp, scb_size_val,
MISC_CTRL_SCB0_SIZE_MASK);
writel(tmp, base + PCIE_MISC_MISC_CTRL);
/* Disable the PCIe->GISB memory window (RC_BAR1) */
clrbits_le32(base + PCIE_MISC_RC_BAR1_CONFIG_LO,
RC_BAR1_CONFIG_LO_SIZE_MASK);
/* Disable the PCIe->SCB memory window (RC_BAR3) */
clrbits_le32(base + PCIE_MISC_RC_BAR3_CONFIG_LO,
RC_BAR3_CONFIG_LO_SIZE_MASK);
/* Mask all interrupts since we are not handling any yet */
writel(0xffffffff, base + PCIE_MSI_INTR2_MASK_SET);
/* Clear any interrupts we find on boot */
writel(0xffffffff, base + PCIE_MSI_INTR2_CLR);
if (pcie->gen)
brcm_pcie_set_gen(pcie, pcie->gen);
/* Unassert the fundamental reset */
clrbits_le32(pcie->base + PCIE_RGR1_SW_INIT_1,
RGR1_SW_INIT_1_PERST_MASK);
/* Give the RC/EP time to wake up, before trying to configure RC.
* Intermittently check status for link-up, up to a total of 100ms.
*/
for (i = 0; i < 100 && !brcm_pcie_link_up(pcie); i += 5)
mdelay(5);
if (!brcm_pcie_link_up(pcie)) {
printf("PCIe BRCM: link down\n");
return -EINVAL;
}
if (!brcm_pcie_rc_mode(pcie)) {
printf("PCIe misconfigured; is in EP mode\n");
return -EINVAL;
}
for (i = 0; i < hose->region_count; i++) {
struct pci_region *reg = &hose->regions[i];
if (reg->flags != PCI_REGION_MEM)
continue;
if (num_out_wins >= BRCM_NUM_PCIE_OUT_WINS)
return -EINVAL;
brcm_pcie_set_outbound_win(pcie, num_out_wins, reg->phys_start,
reg->bus_start, reg->size);
num_out_wins++;
}
/*
* For config space accesses on the RC, show the right class for
* a PCIe-PCIe bridge (the default setting is to be EP mode).
*/
clrsetbits_le32(base + PCIE_RC_CFG_PRIV1_ID_VAL3,
CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK, 0x060400);
if (pcie->ssc) {
ret = brcm_pcie_set_ssc(pcie->base);
if (!ret)
ssc_good = true;
else
printf("PCIe BRCM: failed attempt to enter SSC mode\n");
}
lnksta = readw(base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKSTA);
cls = lnksta & PCI_EXP_LNKSTA_CLS;
nlw = (lnksta & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
printf("PCIe BRCM: link up, %s Gbps x%u %s\n", link_speed_to_str(cls),
nlw, ssc_good ? "(SSC)" : "(!SSC)");
/* PCIe->SCB endian mode for BAR */
clrsetbits_le32(base + PCIE_RC_CFG_VENDOR_SPECIFIC_REG1,
VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK,
VENDOR_SPECIFIC_REG1_LITTLE_ENDIAN);
/*
* Refclk from RC should be gated with CLKREQ# input when ASPM L0s,L1
* is enabled => setting the CLKREQ_DEBUG_ENABLE field to 1.
*/
setbits_le32(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG,
PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK);
return 0;
}
static int brcm_pcie_remove(struct udevice *dev)
{
struct brcm_pcie *pcie = dev_get_priv(dev);
void __iomem *base = pcie->base;
/* Assert fundamental reset */
setbits_le32(base + PCIE_RGR1_SW_INIT_1, RGR1_SW_INIT_1_PERST_MASK);
/* Turn off SerDes */
setbits_le32(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG,
PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
/* Shutdown bridge */
setbits_le32(base + PCIE_RGR1_SW_INIT_1, RGR1_SW_INIT_1_INIT_MASK);
return 0;
}
static int brcm_pcie_of_to_plat(struct udevice *dev)
{
struct brcm_pcie *pcie = dev_get_priv(dev);
ofnode dn = dev_ofnode(dev);
u32 max_link_speed;
int ret;
/* Get the controller base address */
pcie->base = dev_read_addr_ptr(dev);
if (!pcie->base)
return -EINVAL;
pcie->ssc = ofnode_read_bool(dn, "brcm,enable-ssc");
ret = ofnode_read_u32(dn, "max-link-speed", &max_link_speed);
if (ret < 0 || max_link_speed > 4)
pcie->gen = 0;
else
pcie->gen = max_link_speed;
return 0;
}
static const struct dm_pci_ops brcm_pcie_ops = {
.read_config = brcm_pcie_read_config,
.write_config = brcm_pcie_write_config,
};
static const struct udevice_id brcm_pcie_ids[] = {
{ .compatible = "brcm,bcm2711-pcie" },
{ }
};
U_BOOT_DRIVER(pcie_brcm_base) = {
.name = "pcie_brcm",
.id = UCLASS_PCI,
.ops = &brcm_pcie_ops,
.of_match = brcm_pcie_ids,
.probe = brcm_pcie_probe,
.remove = brcm_pcie_remove,
.of_to_plat = brcm_pcie_of_to_plat,
.priv_auto = sizeof(struct brcm_pcie),
.flags = DM_FLAG_OS_PREPARE,
};
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