u-boot/drivers/pci/pcie_layerscape_gen4.c

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// SPDX-License-Identifier: GPL-2.0+ OR X11
/*
* Copyright 2018-2020 NXP
*
* PCIe Gen4 driver for NXP Layerscape SoCs
* Author: Hou Zhiqiang <Minder.Hou@gmail.com>
*/
#include <common.h>
#include <log.h>
#include <asm/arch/fsl_serdes.h>
#include <pci.h>
#include <asm/io.h>
#include <errno.h>
#include <malloc.h>
#include <dm.h>
#include <linux/sizes.h>
#include "pcie_layerscape_gen4.h"
DECLARE_GLOBAL_DATA_PTR;
LIST_HEAD(ls_pcie_g4_list);
static u64 bar_size[4] = {
PCIE_BAR0_SIZE,
PCIE_BAR1_SIZE,
PCIE_BAR2_SIZE,
PCIE_BAR4_SIZE
};
static int ls_pcie_g4_ltssm(struct ls_pcie_g4 *pcie)
{
u32 state;
state = pf_ctrl_readl(pcie, PCIE_LTSSM_STA) & LTSSM_STATE_MASK;
return state;
}
static int ls_pcie_g4_link_up(struct ls_pcie_g4 *pcie)
{
int ltssm;
ltssm = ls_pcie_g4_ltssm(pcie);
if (ltssm != LTSSM_PCIE_L0)
return 0;
return 1;
}
static void ls_pcie_g4_ep_enable_cfg(struct ls_pcie_g4 *pcie)
{
ccsr_writel(pcie, GPEX_CFG_READY, PCIE_CONFIG_READY);
}
static void ls_pcie_g4_cfg_set_target(struct ls_pcie_g4 *pcie, u32 target)
{
ccsr_writel(pcie, PAB_AXI_AMAP_PEX_WIN_L(0), target);
ccsr_writel(pcie, PAB_AXI_AMAP_PEX_WIN_H(0), 0);
}
static int ls_pcie_g4_outbound_win_set(struct ls_pcie_g4 *pcie, int idx,
int type, u64 phys, u64 bus_addr,
pci_size_t size)
{
u32 val;
u32 size_h, size_l;
if (idx >= PAB_WINS_NUM)
return -EINVAL;
size_h = upper_32_bits(~(size - 1));
size_l = lower_32_bits(~(size - 1));
val = ccsr_readl(pcie, PAB_AXI_AMAP_CTRL(idx));
val &= ~((AXI_AMAP_CTRL_TYPE_MASK << AXI_AMAP_CTRL_TYPE_SHIFT) |
(AXI_AMAP_CTRL_SIZE_MASK << AXI_AMAP_CTRL_SIZE_SHIFT) |
AXI_AMAP_CTRL_EN);
val |= ((type & AXI_AMAP_CTRL_TYPE_MASK) << AXI_AMAP_CTRL_TYPE_SHIFT) |
((size_l >> AXI_AMAP_CTRL_SIZE_SHIFT) <<
AXI_AMAP_CTRL_SIZE_SHIFT) | AXI_AMAP_CTRL_EN;
ccsr_writel(pcie, PAB_AXI_AMAP_CTRL(idx), val);
ccsr_writel(pcie, PAB_AXI_AMAP_AXI_WIN(idx), lower_32_bits(phys));
ccsr_writel(pcie, PAB_EXT_AXI_AMAP_AXI_WIN(idx), upper_32_bits(phys));
ccsr_writel(pcie, PAB_AXI_AMAP_PEX_WIN_L(idx), lower_32_bits(bus_addr));
ccsr_writel(pcie, PAB_AXI_AMAP_PEX_WIN_H(idx), upper_32_bits(bus_addr));
ccsr_writel(pcie, PAB_EXT_AXI_AMAP_SIZE(idx), size_h);
return 0;
}
static int ls_pcie_g4_rc_inbound_win_set(struct ls_pcie_g4 *pcie, int idx,
int type, u64 phys, u64 bus_addr,
pci_size_t size)
{
u32 val;
pci_size_t win_size = ~(size - 1);
val = ccsr_readl(pcie, PAB_PEX_AMAP_CTRL(idx));
val &= ~(PEX_AMAP_CTRL_TYPE_MASK << PEX_AMAP_CTRL_TYPE_SHIFT);
val &= ~(PEX_AMAP_CTRL_EN_MASK << PEX_AMAP_CTRL_EN_SHIFT);
val = (val | (type << PEX_AMAP_CTRL_TYPE_SHIFT));
val = (val | (1 << PEX_AMAP_CTRL_EN_SHIFT));
ccsr_writel(pcie, PAB_PEX_AMAP_CTRL(idx),
val | lower_32_bits(win_size));
ccsr_writel(pcie, PAB_EXT_PEX_AMAP_SIZE(idx), upper_32_bits(win_size));
ccsr_writel(pcie, PAB_PEX_AMAP_AXI_WIN(idx), lower_32_bits(phys));
ccsr_writel(pcie, PAB_EXT_PEX_AMAP_AXI_WIN(idx), upper_32_bits(phys));
ccsr_writel(pcie, PAB_PEX_AMAP_PEX_WIN_L(idx), lower_32_bits(bus_addr));
ccsr_writel(pcie, PAB_PEX_AMAP_PEX_WIN_H(idx), upper_32_bits(bus_addr));
return 0;
}
static void ls_pcie_g4_dump_wins(struct ls_pcie_g4 *pcie, int wins)
{
int i;
for (i = 0; i < wins; i++) {
debug("APIO Win%d:\n", i);
debug("\tLOWER PHYS: 0x%08x\n",
ccsr_readl(pcie, PAB_AXI_AMAP_AXI_WIN(i)));
debug("\tUPPER PHYS: 0x%08x\n",
ccsr_readl(pcie, PAB_EXT_AXI_AMAP_AXI_WIN(i)));
debug("\tLOWER BUS: 0x%08x\n",
ccsr_readl(pcie, PAB_AXI_AMAP_PEX_WIN_L(i)));
debug("\tUPPER BUS: 0x%08x\n",
ccsr_readl(pcie, PAB_AXI_AMAP_PEX_WIN_H(i)));
debug("\tSIZE: 0x%08x\n",
ccsr_readl(pcie, PAB_AXI_AMAP_CTRL(i)) &
(AXI_AMAP_CTRL_SIZE_MASK << AXI_AMAP_CTRL_SIZE_SHIFT));
debug("\tEXT_SIZE: 0x%08x\n",
ccsr_readl(pcie, PAB_EXT_AXI_AMAP_SIZE(i)));
debug("\tPARAM: 0x%08x\n",
ccsr_readl(pcie, PAB_AXI_AMAP_PCI_HDR_PARAM(i)));
debug("\tCTRL: 0x%08x\n",
ccsr_readl(pcie, PAB_AXI_AMAP_CTRL(i)));
}
}
static void ls_pcie_g4_setup_wins(struct ls_pcie_g4 *pcie)
{
struct pci_region *io, *mem, *pref;
int idx = 1;
/* INBOUND WIN */
ls_pcie_g4_rc_inbound_win_set(pcie, 0, IB_TYPE_MEM_F, 0, 0, SIZE_1T);
/* OUTBOUND WIN 0: CFG */
ls_pcie_g4_outbound_win_set(pcie, 0, PAB_AXI_TYPE_CFG,
pcie->cfg_res.start, 0,
fdt_resource_size(&pcie->cfg_res));
pci_get_regions(pcie->bus, &io, &mem, &pref);
if (io)
/* OUTBOUND WIN: IO */
ls_pcie_g4_outbound_win_set(pcie, idx++, PAB_AXI_TYPE_IO,
io->phys_start, io->bus_start,
io->size);
if (mem)
/* OUTBOUND WIN: MEM */
ls_pcie_g4_outbound_win_set(pcie, idx++, PAB_AXI_TYPE_MEM,
mem->phys_start, mem->bus_start,
mem->size);
if (pref)
/* OUTBOUND WIN: perf MEM */
ls_pcie_g4_outbound_win_set(pcie, idx++, PAB_AXI_TYPE_MEM,
pref->phys_start, pref->bus_start,
pref->size);
ls_pcie_g4_dump_wins(pcie, idx);
}
/* Return 0 if the address is valid, -errno if not valid */
static int ls_pcie_g4_addr_valid(struct ls_pcie_g4 *pcie, pci_dev_t bdf)
{
struct udevice *bus = pcie->bus;
if (pcie->mode == PCI_HEADER_TYPE_NORMAL)
return -ENODEV;
if (!pcie->enabled)
return -ENXIO;
if (PCI_BUS(bdf) < dev_seq(bus))
return -EINVAL;
if ((PCI_BUS(bdf) > dev_seq(bus)) && (!ls_pcie_g4_link_up(pcie)))
return -EINVAL;
if (PCI_BUS(bdf) <= (dev_seq(bus) + 1) && (PCI_DEV(bdf) > 0))
return -EINVAL;
return 0;
}
void *ls_pcie_g4_conf_address(struct ls_pcie_g4 *pcie, pci_dev_t bdf,
int offset)
{
struct udevice *bus = pcie->bus;
u32 target;
if (PCI_BUS(bdf) == dev_seq(bus)) {
if (offset < INDIRECT_ADDR_BNDRY) {
ccsr_set_page(pcie, 0);
return pcie->ccsr + offset;
}
ccsr_set_page(pcie, OFFSET_TO_PAGE_IDX(offset));
return pcie->ccsr + OFFSET_TO_PAGE_ADDR(offset);
}
target = PAB_TARGET_BUS(PCI_BUS(bdf) - dev_seq(bus)) |
PAB_TARGET_DEV(PCI_DEV(bdf)) |
PAB_TARGET_FUNC(PCI_FUNC(bdf));
ls_pcie_g4_cfg_set_target(pcie, target);
return pcie->cfg + offset;
}
static int ls_pcie_g4_read_config(const struct udevice *bus, pci_dev_t bdf,
uint offset, ulong *valuep,
enum pci_size_t size)
{
struct ls_pcie_g4 *pcie = dev_get_priv(bus);
void *address;
int ret = 0;
if (ls_pcie_g4_addr_valid(pcie, bdf)) {
*valuep = pci_get_ff(size);
return 0;
}
address = ls_pcie_g4_conf_address(pcie, bdf, offset);
switch (size) {
case PCI_SIZE_8:
*valuep = readb(address);
break;
case PCI_SIZE_16:
*valuep = readw(address);
break;
case PCI_SIZE_32:
*valuep = readl(address);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int ls_pcie_g4_write_config(struct udevice *bus, pci_dev_t bdf,
uint offset, ulong value,
enum pci_size_t size)
{
struct ls_pcie_g4 *pcie = dev_get_priv(bus);
void *address;
if (ls_pcie_g4_addr_valid(pcie, bdf))
return 0;
address = ls_pcie_g4_conf_address(pcie, bdf, offset);
switch (size) {
case PCI_SIZE_8:
writeb(value, address);
return 0;
case PCI_SIZE_16:
writew(value, address);
return 0;
case PCI_SIZE_32:
writel(value, address);
return 0;
default:
return -EINVAL;
}
}
static void ls_pcie_g4_setup_ctrl(struct ls_pcie_g4 *pcie)
{
u32 val;
/* Fix class code */
val = ccsr_readl(pcie, GPEX_CLASSCODE);
val &= ~(GPEX_CLASSCODE_MASK << GPEX_CLASSCODE_SHIFT);
val |= PCI_CLASS_BRIDGE_PCI << GPEX_CLASSCODE_SHIFT;
ccsr_writel(pcie, GPEX_CLASSCODE, val);
/* Enable APIO and Memory/IO/CFG Wins */
val = ccsr_readl(pcie, PAB_AXI_PIO_CTRL(0));
val |= APIO_EN | MEM_WIN_EN | IO_WIN_EN | CFG_WIN_EN;
ccsr_writel(pcie, PAB_AXI_PIO_CTRL(0), val);
ls_pcie_g4_setup_wins(pcie);
pcie->stream_id_cur = 0;
}
static void ls_pcie_g4_ep_inbound_win_set(struct ls_pcie_g4 *pcie, int pf,
int bar, u64 phys)
{
u32 val;
/* PF BAR1 is for MSI-X and only need to enable */
if (bar == 1) {
ccsr_writel(pcie, PAB_PEX_BAR_AMAP(pf, bar), BAR_AMAP_EN);
return;
}
val = upper_32_bits(phys);
ccsr_writel(pcie, PAB_EXT_PEX_BAR_AMAP(pf, bar), val);
val = lower_32_bits(phys) | BAR_AMAP_EN;
ccsr_writel(pcie, PAB_PEX_BAR_AMAP(pf, bar), val);
}
static void ls_pcie_g4_ep_setup_wins(struct ls_pcie_g4 *pcie, int pf)
{
u64 phys;
int bar;
u32 val;
if ((!pcie->sriov_support && pf > LS_G4_PF0) || pf > LS_G4_PF1)
return;
phys = CONFIG_SYS_PCI_EP_MEMORY_BASE + PCIE_BAR_SIZE * 4 * pf;
for (bar = 0; bar < PF_BAR_NUM; bar++) {
ls_pcie_g4_ep_inbound_win_set(pcie, pf, bar, phys);
phys += PCIE_BAR_SIZE;
}
/* OUTBOUND: map MEM */
ls_pcie_g4_outbound_win_set(pcie, pf, PAB_AXI_TYPE_MEM,
pcie->cfg_res.start +
CONFIG_SYS_PCI_MEMORY_SIZE * pf, 0x0,
CONFIG_SYS_PCI_MEMORY_SIZE);
val = ccsr_readl(pcie, PAB_AXI_AMAP_PCI_HDR_PARAM(pf));
val &= ~FUNC_NUM_PCIE_MASK;
val |= pf;
ccsr_writel(pcie, PAB_AXI_AMAP_PCI_HDR_PARAM(pf), val);
}
static void ls_pcie_g4_ep_enable_bar(struct ls_pcie_g4 *pcie, int pf,
int bar, bool vf_bar, bool enable)
{
u32 val;
u32 bar_pos = BAR_POS(bar, pf, vf_bar);
val = ccsr_readl(pcie, GPEX_BAR_ENABLE);
if (enable)
val |= 1 << bar_pos;
else
val &= ~(1 << bar_pos);
ccsr_writel(pcie, GPEX_BAR_ENABLE, val);
}
static void ls_pcie_g4_ep_set_bar_size(struct ls_pcie_g4 *pcie, int pf,
int bar, bool vf_bar, u64 size)
{
u32 bar_pos = BAR_POS(bar, pf, vf_bar);
u32 mask_l = lower_32_bits(~(size - 1));
u32 mask_h = upper_32_bits(~(size - 1));
ccsr_writel(pcie, GPEX_BAR_SELECT, bar_pos);
ccsr_writel(pcie, GPEX_BAR_SIZE_LDW, mask_l);
ccsr_writel(pcie, GPEX_BAR_SIZE_UDW, mask_h);
}
static void ls_pcie_g4_ep_setup_bar(struct ls_pcie_g4 *pcie, int pf,
int bar, bool vf_bar, u64 size)
{
bool en = size ? true : false;
ls_pcie_g4_ep_enable_bar(pcie, pf, bar, vf_bar, en);
ls_pcie_g4_ep_set_bar_size(pcie, pf, bar, vf_bar, size);
}
static void ls_pcie_g4_ep_setup_bars(struct ls_pcie_g4 *pcie, int pf)
{
int bar;
/* Setup PF BARs */
for (bar = 0; bar < PF_BAR_NUM; bar++)
ls_pcie_g4_ep_setup_bar(pcie, pf, bar, false, bar_size[bar]);
if (!pcie->sriov_support)
return;
/* Setup VF BARs */
for (bar = 0; bar < VF_BAR_NUM; bar++)
ls_pcie_g4_ep_setup_bar(pcie, pf, bar, true, bar_size[bar]);
}
static void ls_pcie_g4_set_sriov(struct ls_pcie_g4 *pcie, int pf)
{
unsigned int val;
val = ccsr_readl(pcie, GPEX_SRIOV_INIT_VFS_TOTAL_VF(pf));
val &= ~(TTL_VF_MASK << TTL_VF_SHIFT);
val |= PCIE_VF_NUM << TTL_VF_SHIFT;
val &= ~(INI_VF_MASK << INI_VF_SHIFT);
val |= PCIE_VF_NUM << INI_VF_SHIFT;
ccsr_writel(pcie, GPEX_SRIOV_INIT_VFS_TOTAL_VF(pf), val);
val = ccsr_readl(pcie, PCIE_SRIOV_VF_OFFSET_STRIDE);
val += PCIE_VF_NUM * pf - pf;
ccsr_writel(pcie, GPEX_SRIOV_VF_OFFSET_STRIDE(pf), val);
}
static void ls_pcie_g4_setup_ep(struct ls_pcie_g4 *pcie)
{
u32 pf, sriov;
u32 val;
int i;
/* Enable APIO and Memory Win */
val = ccsr_readl(pcie, PAB_AXI_PIO_CTRL(0));
val |= APIO_EN | MEM_WIN_EN;
ccsr_writel(pcie, PAB_AXI_PIO_CTRL(0), val);
sriov = ccsr_readl(pcie, PCIE_SRIOV_CAPABILITY);
if (PCI_EXT_CAP_ID(sriov) == PCI_EXT_CAP_ID_SRIOV)
pcie->sriov_support = 1;
pf = pcie->sriov_support ? PCIE_PF_NUM : 1;
for (i = 0; i < pf; i++) {
ls_pcie_g4_ep_setup_bars(pcie, i);
ls_pcie_g4_ep_setup_wins(pcie, i);
if (pcie->sriov_support)
ls_pcie_g4_set_sriov(pcie, i);
}
ls_pcie_g4_ep_enable_cfg(pcie);
ls_pcie_g4_dump_wins(pcie, pf);
}
static int ls_pcie_g4_probe(struct udevice *dev)
{
struct ls_pcie_g4 *pcie = dev_get_priv(dev);
const void *fdt = gd->fdt_blob;
int node = dev_of_offset(dev);
u32 link_ctrl_sta;
u32 val;
int ret;
fdt_size_t cfg_size;
pcie->bus = dev;
ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
"ccsr", &pcie->ccsr_res);
if (ret) {
printf("ls-pcie-g4: resource \"ccsr\" not found\n");
return ret;
}
pcie->idx = (pcie->ccsr_res.start - PCIE_SYS_BASE_ADDR) /
PCIE_CCSR_SIZE;
list_add(&pcie->list, &ls_pcie_g4_list);
pcie->enabled = is_serdes_configured(PCIE_SRDS_PRTCL(pcie->idx));
if (!pcie->enabled) {
printf("PCIe%d: %s disabled\n", PCIE_SRDS_PRTCL(pcie->idx),
dev->name);
return 0;
}
pcie->ccsr = map_physmem(pcie->ccsr_res.start,
fdt_resource_size(&pcie->ccsr_res),
MAP_NOCACHE);
ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
"config", &pcie->cfg_res);
if (ret) {
printf("%s: resource \"config\" not found\n", dev->name);
return ret;
}
cfg_size = fdt_resource_size(&pcie->cfg_res);
if (cfg_size < SZ_4K) {
printf("PCIe%d: %s Invalid size(0x%llx) for resource \"config\",expected minimum 0x%x\n",
PCIE_SRDS_PRTCL(pcie->idx), dev->name, cfg_size, SZ_4K);
return 0;
}
pcie->cfg = map_physmem(pcie->cfg_res.start,
fdt_resource_size(&pcie->cfg_res),
MAP_NOCACHE);
ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
"lut", &pcie->lut_res);
if (ret) {
printf("ls-pcie-g4: resource \"lut\" not found\n");
return ret;
}
pcie->lut = map_physmem(pcie->lut_res.start,
fdt_resource_size(&pcie->lut_res),
MAP_NOCACHE);
ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
"pf_ctrl", &pcie->pf_ctrl_res);
if (ret) {
printf("ls-pcie-g4: resource \"pf_ctrl\" not found\n");
return ret;
}
pcie->pf_ctrl = map_physmem(pcie->pf_ctrl_res.start,
fdt_resource_size(&pcie->pf_ctrl_res),
MAP_NOCACHE);
pcie->big_endian = fdtdec_get_bool(fdt, node, "big-endian");
debug("%s ccsr:%lx, cfg:0x%lx, big-endian:%d\n",
dev->name, (unsigned long)pcie->ccsr, (unsigned long)pcie->cfg,
pcie->big_endian);
pcie->mode = readb(pcie->ccsr + PCI_HEADER_TYPE) & 0x7f;
if (pcie->mode == PCI_HEADER_TYPE_NORMAL) {
printf("PCIe%u: %s %s", PCIE_SRDS_PRTCL(pcie->idx), dev->name,
"Endpoint");
ls_pcie_g4_setup_ep(pcie);
} else {
printf("PCIe%u: %s %s", PCIE_SRDS_PRTCL(pcie->idx), dev->name,
"Root Complex");
ls_pcie_g4_setup_ctrl(pcie);
}
/* Enable Amba & PEX PIO */
val = ccsr_readl(pcie, PAB_CTRL);
val |= PAB_CTRL_APIO_EN | PAB_CTRL_PPIO_EN;
ccsr_writel(pcie, PAB_CTRL, val);
val = ccsr_readl(pcie, PAB_PEX_PIO_CTRL(0));
val |= PPIO_EN;
ccsr_writel(pcie, PAB_PEX_PIO_CTRL(0), val);
if (!ls_pcie_g4_link_up(pcie)) {
/* Let the user know there's no PCIe link */
printf(": no link\n");
return 0;
}
/* Print the negotiated PCIe link width */
link_ctrl_sta = ccsr_readl(pcie, PCIE_LINK_CTRL_STA);
printf(": x%d gen%d\n",
(link_ctrl_sta >> PCIE_LINK_WIDTH_SHIFT & PCIE_LINK_WIDTH_MASK),
(link_ctrl_sta >> PCIE_LINK_SPEED_SHIFT) & PCIE_LINK_SPEED_MASK);
return 0;
}
static const struct dm_pci_ops ls_pcie_g4_ops = {
.read_config = ls_pcie_g4_read_config,
.write_config = ls_pcie_g4_write_config,
};
static const struct udevice_id ls_pcie_g4_ids[] = {
{ .compatible = "fsl,lx2160a-pcie" },
{ }
};
U_BOOT_DRIVER(pcie_layerscape_gen4) = {
.name = "pcie_layerscape_gen4",
.id = UCLASS_PCI,
.of_match = ls_pcie_g4_ids,
.ops = &ls_pcie_g4_ops,
.probe = ls_pcie_g4_probe,
.priv_auto = sizeof(struct ls_pcie_g4),
};