u-boot/drivers/pci/pcie_fsl.c

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// SPDX-License-Identifier: GPL-2.0+ OR X11
/*
* Copyright 2019 NXP
*
* PCIe DM U-Boot driver for Freescale PowerPC SoCs
* Author: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
*/
#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <mapmem.h>
#include <pci.h>
#include <asm/fsl_pci.h>
#include <asm/fsl_serdes.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <linux/delay.h>
#include "pcie_fsl.h"
#include <dm/device_compat.h>
LIST_HEAD(fsl_pcie_list);
static int fsl_pcie_link_up(struct fsl_pcie *pcie);
static int fsl_pcie_addr_valid(struct fsl_pcie *pcie, pci_dev_t bdf)
{
struct udevice *bus = pcie->bus;
if (!pcie->enabled)
return -ENXIO;
if (PCI_BUS(bdf) < dev_seq(bus))
return -EINVAL;
if (PCI_BUS(bdf) > dev_seq(bus) && (!fsl_pcie_link_up(pcie) || pcie->mode))
return -EINVAL;
if (PCI_BUS(bdf) == dev_seq(bus) && (PCI_DEV(bdf) > 0 || PCI_FUNC(bdf) > 0))
return -EINVAL;
if (PCI_BUS(bdf) == (dev_seq(bus) + 1) && (PCI_DEV(bdf) > 0))
return -EINVAL;
return 0;
}
static int fsl_pcie_read_config(const struct udevice *bus, pci_dev_t bdf,
uint offset, ulong *valuep,
enum pci_size_t size)
{
struct fsl_pcie *pcie = dev_get_priv(bus);
ccsr_fsl_pci_t *regs = pcie->regs;
u32 val;
if (fsl_pcie_addr_valid(pcie, bdf)) {
*valuep = pci_get_ff(size);
return 0;
}
val = PCI_CONF1_EXT_ADDRESS(PCI_BUS(bdf) - dev_seq(bus),
PCI_DEV(bdf), PCI_FUNC(bdf),
offset);
out_be32(&regs->cfg_addr, val);
sync();
switch (size) {
case PCI_SIZE_8:
*valuep = in_8((u8 *)&regs->cfg_data + (offset & 3));
break;
case PCI_SIZE_16:
*valuep = in_le16((u16 *)((u8 *)&regs->cfg_data +
(offset & 2)));
break;
case PCI_SIZE_32:
*valuep = in_le32(&regs->cfg_data);
break;
}
return 0;
}
static int fsl_pcie_write_config(struct udevice *bus, pci_dev_t bdf,
uint offset, ulong value,
enum pci_size_t size)
{
struct fsl_pcie *pcie = dev_get_priv(bus);
ccsr_fsl_pci_t *regs = pcie->regs;
u32 val;
u8 val_8;
u16 val_16;
u32 val_32;
if (fsl_pcie_addr_valid(pcie, bdf))
return 0;
val = PCI_CONF1_EXT_ADDRESS(PCI_BUS(bdf) - dev_seq(bus),
PCI_DEV(bdf), PCI_FUNC(bdf),
offset);
out_be32(&regs->cfg_addr, val);
sync();
switch (size) {
case PCI_SIZE_8:
val_8 = value;
out_8((u8 *)&regs->cfg_data + (offset & 3), val_8);
break;
case PCI_SIZE_16:
val_16 = value;
out_le16((u16 *)((u8 *)&regs->cfg_data + (offset & 2)), val_16);
break;
case PCI_SIZE_32:
val_32 = value;
out_le32(&regs->cfg_data, val_32);
break;
}
return 0;
}
static int fsl_pcie_hose_read_config(struct fsl_pcie *pcie, uint offset,
ulong *valuep, enum pci_size_t size)
{
int ret;
struct udevice *bus = pcie->bus;
ret = fsl_pcie_read_config(bus, PCI_BDF(dev_seq(bus), 0, 0),
offset, valuep, size);
return ret;
}
static int fsl_pcie_hose_write_config(struct fsl_pcie *pcie, uint offset,
ulong value, enum pci_size_t size)
{
struct udevice *bus = pcie->bus;
return fsl_pcie_write_config(bus, PCI_BDF(dev_seq(bus), 0, 0),
offset, value, size);
}
static int fsl_pcie_hose_read_config_byte(struct fsl_pcie *pcie, uint offset,
u8 *valuep)
{
ulong val;
int ret;
ret = fsl_pcie_hose_read_config(pcie, offset, &val, PCI_SIZE_8);
*valuep = val;
return ret;
}
static int fsl_pcie_hose_read_config_word(struct fsl_pcie *pcie, uint offset,
u16 *valuep)
{
ulong val;
int ret;
ret = fsl_pcie_hose_read_config(pcie, offset, &val, PCI_SIZE_16);
*valuep = val;
return ret;
}
static int fsl_pcie_hose_read_config_dword(struct fsl_pcie *pcie, uint offset,
u32 *valuep)
{
ulong val;
int ret;
ret = fsl_pcie_hose_read_config(pcie, offset, &val, PCI_SIZE_32);
*valuep = val;
return ret;
}
static int fsl_pcie_hose_write_config_byte(struct fsl_pcie *pcie, uint offset,
u8 value)
{
return fsl_pcie_hose_write_config(pcie, offset, value, PCI_SIZE_8);
}
static int fsl_pcie_hose_write_config_word(struct fsl_pcie *pcie, uint offset,
u16 value)
{
return fsl_pcie_hose_write_config(pcie, offset, value, PCI_SIZE_16);
}
static int fsl_pcie_hose_write_config_dword(struct fsl_pcie *pcie, uint offset,
u32 value)
{
return fsl_pcie_hose_write_config(pcie, offset, value, PCI_SIZE_32);
}
static int fsl_pcie_link_up(struct fsl_pcie *pcie)
{
ccsr_fsl_pci_t *regs = pcie->regs;
u16 ltssm;
if (pcie->block_rev >= PEX_IP_BLK_REV_3_0) {
ltssm = (in_be32(&regs->pex_csr0)
& PEX_CSR0_LTSSM_MASK) >> PEX_CSR0_LTSSM_SHIFT;
return ltssm == LTSSM_L0_REV3;
}
fsl_pcie_hose_read_config_word(pcie, PCI_LTSSM, &ltssm);
return ltssm == LTSSM_L0;
}
static bool fsl_pcie_is_agent(struct fsl_pcie *pcie)
{
u8 header_type;
fsl_pcie_hose_read_config_byte(pcie, PCI_HEADER_TYPE, &header_type);
return (header_type & 0x7f) == PCI_HEADER_TYPE_NORMAL;
}
static int fsl_pcie_setup_law(struct fsl_pcie *pcie)
{
struct pci_region *io, *mem, *pref;
pci_get_regions(pcie->bus, &io, &mem, &pref);
if (mem)
set_next_law(mem->phys_start,
law_size_bits(mem->size),
pcie->law_trgt_if);
if (io)
set_next_law(io->phys_start,
law_size_bits(io->size),
pcie->law_trgt_if);
return 0;
}
static void fsl_pcie_config_ready(struct fsl_pcie *pcie)
{
ccsr_fsl_pci_t *regs = pcie->regs;
if (pcie->block_rev >= PEX_IP_BLK_REV_3_0) {
setbits_be32(&regs->config, FSL_PCIE_V3_CFG_RDY);
return;
}
fsl_pcie_hose_write_config_byte(pcie, FSL_PCIE_CFG_RDY, 0x1);
}
static int fsl_pcie_setup_outbound_win(struct fsl_pcie *pcie, int idx,
int type, u64 phys, u64 bus_addr,
pci_size_t size)
{
ccsr_fsl_pci_t *regs = pcie->regs;
pot_t *po = &regs->pot[idx];
u32 war, sz;
if (idx < 0)
return -EINVAL;
out_be32(&po->powbar, phys >> 12);
out_be32(&po->potar, bus_addr >> 12);
#ifdef CONFIG_SYS_PCI_64BIT
out_be32(&po->potear, bus_addr >> 44);
#else
out_be32(&po->potear, 0);
#endif
sz = (__ilog2_u64((u64)size) - 1);
war = POWAR_EN | sz;
if (type == PCI_REGION_IO)
war |= POWAR_IO_READ | POWAR_IO_WRITE;
else
war |= POWAR_MEM_READ | POWAR_MEM_WRITE;
out_be32(&po->powar, war);
return 0;
}
static int fsl_pcie_setup_inbound_win(struct fsl_pcie *pcie, int idx,
bool pf, u64 phys, u64 bus_addr,
pci_size_t size)
{
ccsr_fsl_pci_t *regs = pcie->regs;
pit_t *pi = &regs->pit[idx];
u32 sz = (__ilog2_u64(size) - 1);
u32 flag = PIWAR_LOCAL;
if (idx < 0)
return -EINVAL;
out_be32(&pi->pitar, phys >> 12);
out_be32(&pi->piwbar, bus_addr >> 12);
#ifdef CONFIG_SYS_PCI_64BIT
out_be32(&pi->piwbear, bus_addr >> 44);
#else
out_be32(&pi->piwbear, 0);
#endif
#ifdef CONFIG_SYS_FSL_ERRATUM_A005434
flag = 0;
#endif
flag |= PIWAR_EN | PIWAR_READ_SNOOP | PIWAR_WRITE_SNOOP;
if (pf)
flag |= PIWAR_PF;
out_be32(&pi->piwar, flag | sz);
return 0;
}
static int fsl_pcie_setup_outbound_wins(struct fsl_pcie *pcie)
{
struct pci_region *io, *mem, *pref;
int idx = 1; /* skip 0 */
pci_get_regions(pcie->bus, &io, &mem, &pref);
if (io)
/* ATU : OUTBOUND : IO */
fsl_pcie_setup_outbound_win(pcie, idx++,
PCI_REGION_IO,
io->phys_start,
io->bus_start,
io->size);
if (mem)
/* ATU : OUTBOUND : MEM */
fsl_pcie_setup_outbound_win(pcie, idx++,
PCI_REGION_MEM,
mem->phys_start,
mem->bus_start,
mem->size);
return 0;
}
static int fsl_pcie_setup_inbound_wins(struct fsl_pcie *pcie)
{
phys_addr_t phys_start = CONFIG_SYS_PCI_MEMORY_PHYS;
pci_addr_t bus_start = CONFIG_SYS_PCI_MEMORY_BUS;
u64 sz = min((u64)gd->ram_size, (1ull << 32));
pci_size_t pci_sz;
int idx;
if (pcie->block_rev >= PEX_IP_BLK_REV_2_2)
idx = 2;
else
idx = 3;
pci_sz = 1ull << __ilog2_u64(sz);
dev_dbg(pcie->bus, "R0 bus_start: %llx phys_start: %llx size: %llx\n",
(u64)bus_start, (u64)phys_start, (u64)sz);
/* if we aren't an exact power of two match, pci_sz is smaller
* round it up to the next power of two. We report the actual
* size to pci region tracking.
*/
if (pci_sz != sz)
sz = 2ull << __ilog2_u64(sz);
fsl_pcie_setup_inbound_win(pcie, idx--, true,
CONFIG_SYS_PCI_MEMORY_PHYS,
CONFIG_SYS_PCI_MEMORY_BUS, sz);
#if defined(CONFIG_PHYS_64BIT) && defined(CONFIG_SYS_PCI_64BIT)
/*
* On 64-bit capable systems, set up a mapping for all of DRAM
* in high pci address space.
*/
pci_sz = 1ull << __ilog2_u64(gd->ram_size);
/* round up to the next largest power of two */
if (gd->ram_size > pci_sz)
pci_sz = 1ull << (__ilog2_u64(gd->ram_size) + 1);
dev_dbg(pcie->bus, "R64 bus_start: %llx phys_start: %llx size: %llx\n",
(u64)CONFIG_SYS_PCI64_MEMORY_BUS,
(u64)CONFIG_SYS_PCI_MEMORY_PHYS, (u64)pci_sz);
fsl_pcie_setup_inbound_win(pcie, idx--, true,
CONFIG_SYS_PCI_MEMORY_PHYS,
CONFIG_SYS_PCI64_MEMORY_BUS, pci_sz);
#endif
return 0;
}
static int fsl_pcie_init_atmu(struct fsl_pcie *pcie)
{
fsl_pcie_setup_outbound_wins(pcie);
fsl_pcie_setup_inbound_wins(pcie);
return 0;
}
static void fsl_pcie_dbi_read_only_reg_write_enable(struct fsl_pcie *pcie,
bool enable)
{
u32 val;
fsl_pcie_hose_read_config_dword(pcie, DBI_RO_WR_EN, &val);
if (enable)
val |= 1;
else
val &= ~1;
fsl_pcie_hose_write_config_dword(pcie, DBI_RO_WR_EN, val);
}
static int fsl_pcie_init_port(struct fsl_pcie *pcie)
{
ccsr_fsl_pci_t *regs = pcie->regs;
u32 val_32;
u16 val_16;
fsl_pcie_init_atmu(pcie);
#ifdef CONFIG_FSL_PCIE_DISABLE_ASPM
val_32 = 0;
fsl_pcie_hose_read_config_dword(pcie, PCI_LCR, &val_32);
val_32 &= ~0x03;
fsl_pcie_hose_write_config_dword(pcie, PCI_LCR, val_32);
udelay(1);
#endif
#ifdef CONFIG_FSL_PCIE_RESET
u16 ltssm;
int i;
if (pcie->block_rev >= PEX_IP_BLK_REV_3_0) {
/* assert PCIe reset */
setbits_be32(&regs->pdb_stat, 0x08000000);
(void)in_be32(&regs->pdb_stat);
udelay(1000);
/* clear PCIe reset */
clrbits_be32(&regs->pdb_stat, 0x08000000);
asm("sync;isync");
for (i = 0; i < 100 && !fsl_pcie_link_up(pcie); i++)
udelay(1000);
} else {
fsl_pcie_hose_read_config_word(pcie, PCI_LTSSM, &ltssm);
if (ltssm == 1) {
/* assert PCIe reset */
setbits_be32(&regs->pdb_stat, 0x08000000);
(void)in_be32(&regs->pdb_stat);
udelay(100);
/* clear PCIe reset */
clrbits_be32(&regs->pdb_stat, 0x08000000);
asm("sync;isync");
for (i = 0; i < 100 &&
!fsl_pcie_link_up(pcie); i++)
udelay(1000);
}
}
#endif
#ifdef CONFIG_SYS_P4080_ERRATUM_PCIE_A003
if (!fsl_pcie_link_up(pcie)) {
serdes_corenet_t *srds_regs;
srds_regs = (void *)CONFIG_SYS_FSL_CORENET_SERDES_ADDR;
val_32 = in_be32(&srds_regs->srdspccr0);
if ((val_32 >> 28) == 3) {
int i;
out_be32(&srds_regs->srdspccr0, 2 << 28);
setbits_be32(&regs->pdb_stat, 0x08000000);
in_be32(&regs->pdb_stat);
udelay(100);
clrbits_be32(&regs->pdb_stat, 0x08000000);
asm("sync;isync");
for (i = 0; i < 100 && !fsl_pcie_link_up(pcie); i++)
udelay(1000);
}
}
#endif
/*
* The Read-Only Write Enable bit defaults to 1 instead of 0.
* Set to 0 to protect the read-only registers.
*/
#ifdef CONFIG_SYS_FSL_ERRATUM_A007815
fsl_pcie_dbi_read_only_reg_write_enable(pcie, false);
#endif
/*
* Enable All Error Interrupts except
* - Master abort (pci)
* - Master PERR (pci)
* - ICCA (PCIe)
*/
out_be32(&regs->peer, ~0x20140);
/* set URR, FER, NFER (but not CER) */
fsl_pcie_hose_read_config_dword(pcie, PCI_DCR, &val_32);
val_32 |= 0xf000e;
fsl_pcie_hose_write_config_dword(pcie, PCI_DCR, val_32);
/* Clear all error indications */
out_be32(&regs->pme_msg_det, 0xffffffff);
out_be32(&regs->pme_msg_int_en, 0xffffffff);
out_be32(&regs->pedr, 0xffffffff);
fsl_pcie_hose_read_config_word(pcie, PCI_DSR, &val_16);
if (val_16)
fsl_pcie_hose_write_config_word(pcie, PCI_DSR, 0xffff);
fsl_pcie_hose_read_config_word(pcie, PCI_SEC_STATUS, &val_16);
if (val_16)
fsl_pcie_hose_write_config_word(pcie, PCI_SEC_STATUS, 0xffff);
return 0;
}
static int fsl_pcie_fixup_classcode(struct fsl_pcie *pcie)
{
u32 classcode_reg;
u32 val;
if (pcie->block_rev >= PEX_IP_BLK_REV_3_0) {
classcode_reg = PCI_CLASS_REVISION;
fsl_pcie_dbi_read_only_reg_write_enable(pcie, true);
} else {
classcode_reg = CSR_CLASSCODE;
}
fsl_pcie_hose_read_config_dword(pcie, classcode_reg, &val);
val &= 0xff;
val |= PCI_CLASS_BRIDGE_PCI << 16;
fsl_pcie_hose_write_config_dword(pcie, classcode_reg, val);
if (pcie->block_rev >= PEX_IP_BLK_REV_3_0)
fsl_pcie_dbi_read_only_reg_write_enable(pcie, false);
return 0;
}
static int fsl_pcie_init_rc(struct fsl_pcie *pcie)
{
return fsl_pcie_fixup_classcode(pcie);
}
static int fsl_pcie_init_ep(struct fsl_pcie *pcie)
{
fsl_pcie_config_ready(pcie);
return 0;
}
static int fsl_pcie_probe(struct udevice *dev)
{
struct fsl_pcie *pcie = dev_get_priv(dev);
ccsr_fsl_pci_t *regs = pcie->regs;
u16 val_16;
pcie->bus = dev;
pcie->block_rev = in_be32(&regs->block_rev1);
list_add(&pcie->list, &fsl_pcie_list);
pcie->enabled = is_serdes_configured(PCIE1 + pcie->idx);
if (!pcie->enabled) {
printf("PCIe%d: %s disabled\n", pcie->idx, dev->name);
return 0;
}
fsl_pcie_setup_law(pcie);
pcie->mode = fsl_pcie_is_agent(pcie);
fsl_pcie_init_port(pcie);
printf("PCIe%d: %s ", pcie->idx, dev->name);
if (pcie->mode) {
printf("Endpoint");
fsl_pcie_init_ep(pcie);
} else {
printf("Root Complex");
fsl_pcie_init_rc(pcie);
}
if (!fsl_pcie_link_up(pcie)) {
printf(": %s\n", pcie->mode ? "undetermined link" : "no link");
return 0;
}
fsl_pcie_hose_read_config_word(pcie, PCI_LSR, &val_16);
printf(": x%d gen%d\n", (val_16 & 0x3f0) >> 4, (val_16 & 0xf));
return 0;
}
static int fsl_pcie_of_to_plat(struct udevice *dev)
{
struct fsl_pcie *pcie = dev_get_priv(dev);
struct fsl_pcie_data *info;
int ret;
pcie->regs = dev_remap_addr(dev);
if (!pcie->regs) {
pr_err("\"reg\" resource not found\n");
return -EINVAL;
}
ret = dev_read_u32(dev, "law_trgt_if", &pcie->law_trgt_if);
if (ret < 0) {
pr_err("\"law_trgt_if\" not found\n");
return ret;
}
info = (struct fsl_pcie_data *)dev_get_driver_data(dev);
pcie->info = info;
pcie->idx = abs((u32)(dev_read_addr(dev) & info->block_offset_mask) -
info->block_offset) / info->stride;
return 0;
}
static const struct dm_pci_ops fsl_pcie_ops = {
.read_config = fsl_pcie_read_config,
.write_config = fsl_pcie_write_config,
};
static struct fsl_pcie_data p1_p2_data = {
.block_offset = 0xa000,
.block_offset_mask = 0xffff,
.stride = 0x1000,
};
static struct fsl_pcie_data p2041_data = {
.block_offset = 0x200000,
.block_offset_mask = 0x3fffff,
.stride = 0x1000,
};
static struct fsl_pcie_data t2080_data = {
.block_offset = 0x240000,
.block_offset_mask = 0x3fffff,
.stride = 0x10000,
};
static const struct udevice_id fsl_pcie_ids[] = {
{ .compatible = "fsl,pcie-mpc8548", .data = (ulong)&p1_p2_data },
{ .compatible = "fsl,pcie-p1_p2", .data = (ulong)&p1_p2_data },
{ .compatible = "fsl,pcie-p2041", .data = (ulong)&p2041_data },
{ .compatible = "fsl,pcie-p3041", .data = (ulong)&p2041_data },
{ .compatible = "fsl,pcie-p4080", .data = (ulong)&p2041_data },
{ .compatible = "fsl,pcie-p5040", .data = (ulong)&p2041_data },
{ .compatible = "fsl,pcie-t102x", .data = (ulong)&t2080_data },
{ .compatible = "fsl,pcie-t104x", .data = (ulong)&t2080_data },
{ .compatible = "fsl,pcie-t2080", .data = (ulong)&t2080_data },
{ .compatible = "fsl,pcie-t4240", .data = (ulong)&t2080_data },
{ }
};
U_BOOT_DRIVER(fsl_pcie) = {
.name = "fsl_pcie",
.id = UCLASS_PCI,
.of_match = fsl_pcie_ids,
.ops = &fsl_pcie_ops,
.of_to_plat = fsl_pcie_of_to_plat,
.probe = fsl_pcie_probe,
.priv_auto = sizeof(struct fsl_pcie),
};