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|
// SPDX-License-Identifier: GPL-2.0
/*
* MediaTek PCIe host controller driver.
*
* Copyright (c) 2017-2019 MediaTek Inc.
* Author: Ryder Lee <ryder.lee@mediatek.com>
* Honghui Zhang <honghui.zhang@mediatek.com>
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <generic-phy.h>
#include <log.h>
#include <malloc.h>
#include <pci.h>
#include <reset.h>
#include <asm/io.h>
#include <dm/devres.h>
#include <linux/bitops.h>
#include <linux/iopoll.h>
#include <linux/list.h>
#include <linux/printk.h>
#include "pci_internal.h"
/* PCIe shared registers */
#define PCIE_SYS_CFG 0x00
#define PCIE_INT_ENABLE 0x0c
#define PCIE_CFG_ADDR 0x20
#define PCIE_CFG_DATA 0x24
/* PCIe per port registers */
#define PCIE_BAR0_SETUP 0x10
#define PCIE_CLASS 0x34
#define PCIE_LINK_STATUS 0x50
#define PCIE_PORT_INT_EN(x) BIT(20 + (x))
#define PCIE_PORT_PERST(x) BIT(1 + (x))
#define PCIE_PORT_LINKUP BIT(0)
#define PCIE_BAR_MAP_MAX GENMASK(31, 16)
#define PCIE_BAR_ENABLE BIT(0)
#define PCIE_REVISION_ID BIT(0)
#define PCIE_CLASS_CODE (0x60400 << 8)
/* MediaTek specific configuration registers */
#define PCIE_FTS_NUM 0x70c
#define PCIE_FTS_NUM_MASK GENMASK(15, 8)
#define PCIE_FTS_NUM_L0(x) ((x) & 0xff << 8)
#define PCIE_FC_CREDIT 0x73c
#define PCIE_FC_CREDIT_MASK (GENMASK(31, 31) | GENMASK(28, 16))
#define PCIE_FC_CREDIT_VAL(x) ((x) << 16)
/* PCIe V2 share registers */
#define PCIE_SYS_CFG_V2 0x0
#define PCIE_CSR_LTSSM_EN(x) BIT(0 + (x) * 8)
#define PCIE_CSR_ASPM_L1_EN(x) BIT(1 + (x) * 8)
/* PCIe V2 per-port registers */
#define PCIE_CONF_VEND_ID 0x100
#define PCIE_CONF_DEVICE_ID 0x102
#define PCIE_CONF_CLASS_ID 0x106
#define PCIE_AHB_TRANS_BASE0_L 0x438
#define PCIE_AHB_TRANS_BASE0_H 0x43c
#define AHB2PCIE_SIZE(x) ((x) & GENMASK(4, 0))
#define PCIE_AXI_WINDOW0 0x448
#define WIN_ENABLE BIT(7)
/*
* Define PCIe to AHB window size as 2^33 to support max 8GB address space
* translate, support least 4GB DRAM size access from EP DMA(physical DRAM
* start from 0x40000000).
*/
#define PCIE2AHB_SIZE 0x21
/* PCIe V2 configuration transaction header */
#define PCIE_CFG_HEADER0 0x460
#define PCIE_CFG_HEADER1 0x464
#define PCIE_CFG_HEADER2 0x468
#define PCIE_CFG_WDATA 0x470
#define PCIE_APP_TLP_REQ 0x488
#define PCIE_CFG_RDATA 0x48c
#define APP_CFG_REQ BIT(0)
#define APP_CPL_STATUS GENMASK(7, 5)
#define CFG_WRRD_TYPE_0 4
#define CFG_WR_FMT 2
#define CFG_RD_FMT 0
#define CFG_DW0_LENGTH(length) ((length) & GENMASK(9, 0))
#define CFG_DW0_TYPE(type) (((type) << 24) & GENMASK(28, 24))
#define CFG_DW0_FMT(fmt) (((fmt) << 29) & GENMASK(31, 29))
#define CFG_DW2_REGN(regn) ((regn) & GENMASK(11, 2))
#define CFG_DW2_FUN(fun) (((fun) << 16) & GENMASK(18, 16))
#define CFG_DW2_DEV(dev) (((dev) << 19) & GENMASK(23, 19))
#define CFG_DW2_BUS(bus) (((bus) << 24) & GENMASK(31, 24))
#define CFG_HEADER_DW0(type, fmt) \
(CFG_DW0_LENGTH(1) | CFG_DW0_TYPE(type) | CFG_DW0_FMT(fmt))
#define CFG_HEADER_DW1(where, size) \
(GENMASK(((size) - 1), 0) << ((where) & 0x3))
#define CFG_HEADER_DW2(regn, fun, dev, bus) \
(CFG_DW2_REGN(regn) | CFG_DW2_FUN(fun) | \
CFG_DW2_DEV(dev) | CFG_DW2_BUS(bus))
#define PCIE_RST_CTRL 0x510
#define PCIE_PHY_RSTB BIT(0)
#define PCIE_PIPE_SRSTB BIT(1)
#define PCIE_MAC_SRSTB BIT(2)
#define PCIE_CRSTB BIT(3)
#define PCIE_PERSTB BIT(8)
#define PCIE_LINKDOWN_RST_EN GENMASK(15, 13)
#define PCIE_LINK_STATUS_V2 0x804
#define PCIE_PORT_LINKUP_V2 BIT(11)
#define PCI_VENDOR_ID_MEDIATEK 0x14c3
enum MTK_PCIE_GEN {PCIE_V1, PCIE_V2, PCIE_V3};
struct mtk_pcie_port {
void __iomem *base;
struct list_head list;
struct mtk_pcie *pcie;
struct reset_ctl reset;
struct clk sys_ck;
struct clk ahb_ck;
struct clk axi_ck;
struct clk aux_ck;
struct clk obff_ck;
struct clk pipe_ck;
struct phy phy;
u32 slot;
};
struct mtk_pcie {
void __iomem *base;
void *priv;
struct clk free_ck;
struct list_head ports;
};
static int mtk_pcie_config_address(const struct udevice *udev, pci_dev_t bdf,
uint offset, void **paddress)
{
struct mtk_pcie *pcie = dev_get_priv(udev);
u32 val;
val = PCI_CONF1_EXT_ADDRESS(PCI_BUS(bdf), PCI_DEV(bdf),
PCI_FUNC(bdf), offset) & ~PCI_CONF1_ENABLE;
writel(val, pcie->base + PCIE_CFG_ADDR);
*paddress = pcie->base + PCIE_CFG_DATA + (offset & 3);
return 0;
}
static int mtk_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, mtk_pcie_config_address,
bdf, offset, valuep, size);
}
static int mtk_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, mtk_pcie_config_address,
bdf, offset, value, size);
}
static const struct dm_pci_ops mtk_pcie_ops = {
.read_config = mtk_pcie_read_config,
.write_config = mtk_pcie_write_config,
};
static int mtk_pcie_check_cfg_cpld(struct mtk_pcie_port *port)
{
u32 val;
int err;
err = readl_poll_timeout(port->base + PCIE_APP_TLP_REQ, val,
!(val & APP_CFG_REQ), 100 * 1000);
if (err)
return -1;
if (readl(port->base + PCIE_APP_TLP_REQ) & APP_CPL_STATUS)
return -1;
return 0;
}
static int mtk_pcie_hw_rd_cfg(struct mtk_pcie_port *port, u32 bus, pci_dev_t devfn,
int where, int size, ulong *val)
{
u32 tmp;
writel(CFG_HEADER_DW0(CFG_WRRD_TYPE_0, CFG_RD_FMT),
port->base + PCIE_CFG_HEADER0);
writel(CFG_HEADER_DW1(where, size), port->base + PCIE_CFG_HEADER1);
writel(CFG_HEADER_DW2(where, PCI_FUNC(devfn), PCI_DEV(devfn), bus),
port->base + PCIE_CFG_HEADER2);
/* Trigger h/w to transmit Cfgrd TLP */
tmp = readl(port->base + PCIE_APP_TLP_REQ);
tmp |= APP_CFG_REQ;
writel(tmp, port->base + PCIE_APP_TLP_REQ);
/* Check completion status */
if (mtk_pcie_check_cfg_cpld(port))
return -1;
/* Read cpld payload of Cfgrd */
*val = readl(port->base + PCIE_CFG_RDATA);
if (size == 1)
*val = (*val >> (8 * (where & 3))) & 0xff;
else if (size == 2)
*val = (*val >> (8 * (where & 3))) & 0xffff;
return 0;
}
static int mtk_pcie_hw_wr_cfg(struct mtk_pcie_port *port, u32 bus, pci_dev_t devfn,
int where, int size, u32 val)
{
/* Write PCIe configuration transaction header for Cfgwr */
writel(CFG_HEADER_DW0(CFG_WRRD_TYPE_0, CFG_WR_FMT),
port->base + PCIE_CFG_HEADER0);
writel(CFG_HEADER_DW1(where, size), port->base + PCIE_CFG_HEADER1);
writel(CFG_HEADER_DW2(where, PCI_FUNC(devfn), PCI_DEV(devfn), bus),
port->base + PCIE_CFG_HEADER2);
/* Write Cfgwr data */
val = val << 8 * (where & 3);
writel(val, port->base + PCIE_CFG_WDATA);
/* Trigger h/w to transmit Cfgwr TLP */
val = readl(port->base + PCIE_APP_TLP_REQ);
val |= APP_CFG_REQ;
writel(val, port->base + PCIE_APP_TLP_REQ);
/* Check completion status */
return mtk_pcie_check_cfg_cpld(port);
}
static struct mtk_pcie_port *mtk_pcie_find_port(const struct udevice *bus,
pci_dev_t bdf)
{
struct mtk_pcie *pcie = dev_get_priv(bus);
struct mtk_pcie_port *port;
struct udevice *dev;
struct pci_child_plat *pplat = NULL;
int ret = 0;
if (PCI_BUS(bdf) != 0) {
ret = pci_get_bus(PCI_BUS(bdf), &dev);
if (ret) {
debug("No such device,ret = %d\n", ret);
return NULL;
}
while (dev_seq(dev->parent) != 0)
dev = dev->parent;
pplat = dev_get_parent_plat(dev);
}
list_for_each_entry(port, &pcie->ports, list) {
if ((PCI_BUS(bdf) == 0) && (PCI_DEV(bdf) == port->slot))
return port;
if (PCI_BUS(bdf) != 0 && PCI_DEV(bdf) == 0 &&
PCI_DEV(pplat->devfn) == port->slot)
return port;
}
return NULL;
}
static int mtk_pcie_config_read(const struct udevice *bus, pci_dev_t bdf,
uint offset, ulong *valuep,
enum pci_size_t size)
{
struct mtk_pcie_port *port;
int ret;
port = mtk_pcie_find_port(bus, bdf);
if (!port) {
*valuep = pci_get_ff(size);
return 0;
}
ret = mtk_pcie_hw_rd_cfg(port, PCI_BUS(bdf), bdf, offset, (1 << size), valuep);
if (ret)
*valuep = pci_get_ff(size);
return ret;
}
static int mtk_pcie_config_write(struct udevice *bus, pci_dev_t bdf,
uint offset, ulong value,
enum pci_size_t size)
{
struct mtk_pcie_port *port;
port = mtk_pcie_find_port(bus, bdf);
if (!port)
return 0;
/* Do not modify RC bar 0/1. */
if (PCI_BUS(bdf) == 0 && (offset == 0x10 || offset == 0x14))
return 0;
return mtk_pcie_hw_wr_cfg(port, PCI_BUS(bdf), bdf, offset, (1 << size), value);
}
static const struct dm_pci_ops mtk_pcie_ops_v2 = {
.read_config = mtk_pcie_config_read,
.write_config = mtk_pcie_config_write,
};
static void mtk_pcie_port_free(struct mtk_pcie_port *port)
{
list_del(&port->list);
free(port);
}
static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
{
struct mtk_pcie *pcie = port->pcie;
u32 val;
int err;
/* assert port PERST_N */
setbits_le32(pcie->base + PCIE_SYS_CFG, PCIE_PORT_PERST(port->slot));
/* de-assert port PERST_N */
clrbits_le32(pcie->base + PCIE_SYS_CFG, PCIE_PORT_PERST(port->slot));
/* 100ms timeout value should be enough for Gen1/2 training */
err = readl_poll_timeout(port->base + PCIE_LINK_STATUS, val,
!!(val & PCIE_PORT_LINKUP), 100000);
if (err)
return -ETIMEDOUT;
/* disable interrupt */
clrbits_le32(pcie->base + PCIE_INT_ENABLE,
PCIE_PORT_INT_EN(port->slot));
/* map to all DDR region. We need to set it before cfg operation. */
writel(PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE,
port->base + PCIE_BAR0_SETUP);
/* configure class code and revision ID */
writel(PCIE_CLASS_CODE | PCIE_REVISION_ID, port->base + PCIE_CLASS);
/* configure FC credit */
val = PCI_CONF1_EXT_ADDRESS(0, port->slot, 0, PCIE_FC_CREDIT) & ~PCI_CONF1_ENABLE;
writel(val, pcie->base + PCIE_CFG_ADDR);
clrsetbits_le32(pcie->base + PCIE_CFG_DATA, PCIE_FC_CREDIT_MASK,
PCIE_FC_CREDIT_VAL(0x806c));
/* configure RC FTS number to 250 when it leaves L0s */
val = PCI_CONF1_EXT_ADDRESS(0, port->slot, 0, PCIE_FTS_NUM) & ~PCI_CONF1_ENABLE;
writel(val, pcie->base + PCIE_CFG_ADDR);
clrsetbits_le32(pcie->base + PCIE_CFG_DATA, PCIE_FTS_NUM_MASK,
PCIE_FTS_NUM_L0(0x50));
return 0;
}
static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
{
struct mtk_pcie *pcie = port->pcie;
struct udevice *dev = pcie->priv;
struct pci_region *pci_mem;
u32 val;
int err;
/* MT7622/MT7629 platforms need to enable LTSSM and ASPM from PCIe subsys */
if (pcie->base) {
val = readl(pcie->base + PCIE_SYS_CFG_V2);
val |= PCIE_CSR_LTSSM_EN(port->slot) |
PCIE_CSR_ASPM_L1_EN(port->slot);
writel(val, pcie->base + PCIE_SYS_CFG_V2);
}
/* Assert all reset signals */
writel(0, port->base + PCIE_RST_CTRL);
/*
* Enable PCIe link down reset, if link status changed from link up to
* link down, this will reset MAC control registers and configuration
* space.
*/
writel(PCIE_LINKDOWN_RST_EN, port->base + PCIE_RST_CTRL);
udelay(500);
/* De-assert PHY, PE, PIPE, MAC and configuration reset */
val = readl(port->base + PCIE_RST_CTRL);
val |= PCIE_PHY_RSTB | PCIE_PIPE_SRSTB | PCIE_MAC_SRSTB | PCIE_CRSTB;
writel(val, port->base + PCIE_RST_CTRL);
mdelay(100);
val |= PCIE_PERSTB;
writel(val, port->base + PCIE_RST_CTRL);
/* Set up vendor ID and class code */
val = PCI_VENDOR_ID_MEDIATEK;
writew(val, port->base + PCIE_CONF_VEND_ID);
val = PCI_CLASS_BRIDGE_PCI;
writew(val, port->base + PCIE_CONF_CLASS_ID);
/* 100ms timeout value should be enough for Gen1/2 training */
err = readl_poll_timeout(port->base + PCIE_LINK_STATUS_V2, val,
!!(val & PCIE_PORT_LINKUP_V2),
100 * 1000);
if (err)
return -ETIMEDOUT;
pci_get_regions(dev, NULL, &pci_mem, NULL);
/* Set AHB to PCIe translation windows */
val = lower_32_bits(pci_mem->bus_start) |
AHB2PCIE_SIZE(fls(pci_mem->size) - 1);
writel(val, port->base + PCIE_AHB_TRANS_BASE0_L);
val = upper_32_bits(pci_mem->bus_start);
writel(val, port->base + PCIE_AHB_TRANS_BASE0_H);
/* Set PCIe to AXI translation memory space.*/
val = PCIE2AHB_SIZE | WIN_ENABLE;
writel(val, port->base + PCIE_AXI_WINDOW0);
return 0;
}
static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
{
int err;
err = clk_enable(&port->sys_ck);
if (err)
goto err_sys_clk;
err = reset_assert(&port->reset);
if (err)
goto err_reset;
err = reset_deassert(&port->reset);
if (err)
goto err_reset;
err = generic_phy_init(&port->phy);
if (err)
goto err_phy_init;
err = generic_phy_power_on(&port->phy);
if (err)
goto err_phy_on;
if (!mtk_pcie_startup_port(port))
return;
pr_err("Port%d link down\n", port->slot);
generic_phy_power_off(&port->phy);
err_phy_on:
generic_phy_exit(&port->phy);
err_phy_init:
err_reset:
clk_disable(&port->sys_ck);
err_sys_clk:
mtk_pcie_port_free(port);
}
static void mtk_pcie_enable_port_v2(struct mtk_pcie_port *port)
{
int err = 0;
err = clk_enable(&port->sys_ck);
if (err) {
debug("clk_enable(sys_ck) failed: %d\n", err);
goto exit;
}
err = clk_enable(&port->ahb_ck);
if (err) {
debug("clk_enable(ahb_ck) failed: %d\n", err);
goto exit;
}
err = clk_enable(&port->aux_ck);
if (err) {
debug("clk_enable(aux_ck) failed: %d\n", err);
goto exit;
}
err = clk_enable(&port->axi_ck);
if (err) {
debug("clk_enable(axi_ck) failed: %d\n", err);
goto exit;
}
err = clk_enable(&port->obff_ck);
if (err) {
debug("clk_enable(obff_ck) failed: %d\n", err);
goto exit;
}
err = clk_enable(&port->pipe_ck);
if (err) {
debug("clk_enable(pipe_ck) failed: %d\n", err);
goto exit;
}
err = mtk_pcie_startup_port_v2(port);
if (!err)
return;
pr_err("Port%d link down\n", port->slot);
exit:
mtk_pcie_port_free(port);
}
static int mtk_pcie_parse_port(struct udevice *dev, u32 slot)
{
struct mtk_pcie *pcie = dev_get_priv(dev);
struct mtk_pcie_port *port;
char name[10];
int err;
port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
snprintf(name, sizeof(name), "port%d", slot);
port->base = dev_remap_addr_name(dev, name);
if (!port->base)
return -ENOENT;
snprintf(name, sizeof(name), "sys_ck%d", slot);
err = clk_get_by_name(dev, name, &port->sys_ck);
if (err)
return err;
err = reset_get_by_index(dev, slot, &port->reset);
if (err)
return err;
err = generic_phy_get_by_index(dev, slot, &port->phy);
if (err)
return err;
port->slot = slot;
port->pcie = pcie;
INIT_LIST_HEAD(&port->list);
list_add_tail(&port->list, &pcie->ports);
return 0;
}
static int mtk_pcie_parse_port_v2(struct udevice *dev, u32 slot)
{
struct mtk_pcie *pcie = dev_get_priv(dev);
struct mtk_pcie_port *port;
char name[10];
int err;
port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
snprintf(name, sizeof(name), "port%d", slot);
port->base = dev_remap_addr_name(dev, name);
if (!port->base) {
debug("failed to map port%d base\n", slot);
return -ENOENT;
}
snprintf(name, sizeof(name), "sys_ck%d", slot);
err = clk_get_by_name(dev, name, &port->sys_ck);
if (err) {
debug("clk_get_by_name(sys_ck) failed: %d\n", err);
return err;
}
snprintf(name, sizeof(name), "ahb_ck%d", slot);
err = clk_get_by_name(dev, name, &port->ahb_ck);
if (err) {
debug("clk_get_by_name(ahb_ck) failed: %d\n", err);
return err;
}
snprintf(name, sizeof(name), "aux_ck%d", slot);
err = clk_get_by_name(dev, name, &port->aux_ck);
if (err) {
debug("clk_get_by_name(aux_ck) failed: %d\n", err);
return err;
}
snprintf(name, sizeof(name), "axi_ck%d", slot);
err = clk_get_by_name(dev, name, &port->axi_ck);
if (err) {
debug("clk_get_by_name(axi_ck) failed: %d\n", err);
return err;
}
snprintf(name, sizeof(name), "obff_ck%d", slot);
err = clk_get_by_name(dev, name, &port->obff_ck);
if (err) {
debug("clk_get_by_name(obff_ck) failed: %d\n", err);
return err;
}
snprintf(name, sizeof(name), "pipe_ck%d", slot);
err = clk_get_by_name(dev, name, &port->pipe_ck);
if (err) {
debug("clk_get_by_name(pipe_ck) failed: %d\n", err);
return err;
}
port->slot = slot;
port->pcie = pcie;
INIT_LIST_HEAD(&port->list);
list_add_tail(&port->list, &pcie->ports);
return 0;
}
static int mtk_pcie_probe(struct udevice *dev)
{
struct mtk_pcie *pcie = dev_get_priv(dev);
struct mtk_pcie_port *port, *tmp;
ofnode subnode;
int err;
INIT_LIST_HEAD(&pcie->ports);
pcie->base = dev_remap_addr_name(dev, "subsys");
if (!pcie->base)
return -ENOENT;
err = clk_get_by_name(dev, "free_ck", &pcie->free_ck);
if (err)
return err;
/* enable top level clock */
err = clk_enable(&pcie->free_ck);
if (err)
return err;
dev_for_each_subnode(subnode, dev) {
struct fdt_pci_addr addr;
u32 slot = 0;
if (!ofnode_is_enabled(subnode))
continue;
err = ofnode_read_pci_addr(subnode, 0, "reg", &addr, NULL);
if (err)
return err;
slot = PCI_DEV(addr.phys_hi);
err = mtk_pcie_parse_port(dev, slot);
if (err)
return err;
}
/* enable each port, and then check link status */
list_for_each_entry_safe(port, tmp, &pcie->ports, list)
mtk_pcie_enable_port(port);
return 0;
}
static int mtk_pcie_probe_v2(struct udevice *dev)
{
struct mtk_pcie *pcie = dev_get_priv(dev);
struct mtk_pcie_port *port, *tmp;
struct fdt_pci_addr addr;
ofnode subnode;
unsigned int slot;
int err;
INIT_LIST_HEAD(&pcie->ports);
pcie->base = dev_remap_addr_name(dev, "subsys");
if (!pcie->base)
return -ENOENT;
pcie->priv = dev;
dev_for_each_subnode(subnode, dev) {
if (!ofnode_is_enabled(subnode))
continue;
err = ofnode_read_pci_addr(subnode, 0, "reg", &addr, NULL);
if (err)
return err;
slot = PCI_DEV(addr.phys_hi);
err = mtk_pcie_parse_port_v2(dev, slot);
if (err)
return err;
}
/* enable each port, and then check link status */
list_for_each_entry_safe(port, tmp, &pcie->ports, list)
mtk_pcie_enable_port_v2(port);
return 0;
}
static const struct udevice_id mtk_pcie_ids[] = {
{ .compatible = "mediatek,mt7623-pcie", PCIE_V1},
{ }
};
U_BOOT_DRIVER(pcie_mediatek_v1) = {
.name = "pcie_mediatek_v1",
.id = UCLASS_PCI,
.of_match = mtk_pcie_ids,
.ops = &mtk_pcie_ops,
.probe = mtk_pcie_probe,
.priv_auto = sizeof(struct mtk_pcie),
};
static const struct udevice_id mtk_pcie_ids_v2[] = {
{ .compatible = "mediatek,mt7622-pcie", PCIE_V2},
{ }
};
U_BOOT_DRIVER(pcie_mediatek_v2) = {
.name = "pcie_mediatek_v2",
.id = UCLASS_PCI,
.of_match = mtk_pcie_ids_v2,
.ops = &mtk_pcie_ops_v2,
.probe = mtk_pcie_probe_v2,
.priv_auto = sizeof(struct mtk_pcie),
};
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