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android-kvm / linux / 1e3cd03c54b76b4cbc8b31256dc3f18c417a6876 / . / drivers / pci / controller / dwc / pcie-designware.c
blob: 250cf7f40b8587e9b2944115801baf5321a10640 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Synopsys DesignWare PCIe host controller driver
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* https://www.samsung.com
*
* Author: Jingoo Han <jg1.han@samsung.com>
*/
#include <linux/align.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma/edma.h>
#include <linux/gpio/consumer.h>
#include <linux/ioport.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/sizes.h>
#include <linux/types.h>
#include "../../pci.h"
#include "pcie-designware.h"
static const char * const dw_pcie_app_clks[DW_PCIE_NUM_APP_CLKS] = {
[DW_PCIE_DBI_CLK] = "dbi",
[DW_PCIE_MSTR_CLK] = "mstr",
[DW_PCIE_SLV_CLK] = "slv",
};
static const char * const dw_pcie_core_clks[DW_PCIE_NUM_CORE_CLKS] = {
[DW_PCIE_PIPE_CLK] = "pipe",
[DW_PCIE_CORE_CLK] = "core",
[DW_PCIE_AUX_CLK] = "aux",
[DW_PCIE_REF_CLK] = "ref",
};
static const char * const dw_pcie_app_rsts[DW_PCIE_NUM_APP_RSTS] = {
[DW_PCIE_DBI_RST] = "dbi",
[DW_PCIE_MSTR_RST] = "mstr",
[DW_PCIE_SLV_RST] = "slv",
};
static const char * const dw_pcie_core_rsts[DW_PCIE_NUM_CORE_RSTS] = {
[DW_PCIE_NON_STICKY_RST] = "non-sticky",
[DW_PCIE_STICKY_RST] = "sticky",
[DW_PCIE_CORE_RST] = "core",
[DW_PCIE_PIPE_RST] = "pipe",
[DW_PCIE_PHY_RST] = "phy",
[DW_PCIE_HOT_RST] = "hot",
[DW_PCIE_PWR_RST] = "pwr",
};
static int dw_pcie_get_clocks(struct dw_pcie *pci)
{
int i, ret;
for (i = 0; i < DW_PCIE_NUM_APP_CLKS; i++)
pci->app_clks[i].id = dw_pcie_app_clks[i];
for (i = 0; i < DW_PCIE_NUM_CORE_CLKS; i++)
pci->core_clks[i].id = dw_pcie_core_clks[i];
ret = devm_clk_bulk_get_optional(pci->dev, DW_PCIE_NUM_APP_CLKS,
pci->app_clks);
if (ret)
return ret;
return devm_clk_bulk_get_optional(pci->dev, DW_PCIE_NUM_CORE_CLKS,
pci->core_clks);
}
static int dw_pcie_get_resets(struct dw_pcie *pci)
{
int i, ret;
for (i = 0; i < DW_PCIE_NUM_APP_RSTS; i++)
pci->app_rsts[i].id = dw_pcie_app_rsts[i];
for (i = 0; i < DW_PCIE_NUM_CORE_RSTS; i++)
pci->core_rsts[i].id = dw_pcie_core_rsts[i];
ret = devm_reset_control_bulk_get_optional_shared(pci->dev,
DW_PCIE_NUM_APP_RSTS,
pci->app_rsts);
if (ret)
return ret;
ret = devm_reset_control_bulk_get_optional_exclusive(pci->dev,
DW_PCIE_NUM_CORE_RSTS,
pci->core_rsts);
if (ret)
return ret;
pci->pe_rst = devm_gpiod_get_optional(pci->dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(pci->pe_rst))
return PTR_ERR(pci->pe_rst);
return 0;
}
int dw_pcie_get_resources(struct dw_pcie *pci)
{
struct platform_device *pdev = to_platform_device(pci->dev);
struct device_node *np = dev_of_node(pci->dev);
struct resource *res;
int ret;
if (!pci->dbi_base) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
pci->dbi_base = devm_pci_remap_cfg_resource(pci->dev, res);
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);
}
/* DBI2 is mainly useful for the endpoint controller */
if (!pci->dbi_base2) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi2");
if (res) {
pci->dbi_base2 = devm_pci_remap_cfg_resource(pci->dev, res);
if (IS_ERR(pci->dbi_base2))
return PTR_ERR(pci->dbi_base2);
} else {
pci->dbi_base2 = pci->dbi_base + SZ_4K;
}
}
/* For non-unrolled iATU/eDMA platforms this range will be ignored */
if (!pci->atu_base) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu");
if (res) {
pci->atu_size = resource_size(res);
pci->atu_base = devm_ioremap_resource(pci->dev, res);
if (IS_ERR(pci->atu_base))
return PTR_ERR(pci->atu_base);
} else {
pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
}
}
/* Set a default value suitable for at most 8 in and 8 out windows */
if (!pci->atu_size)
pci->atu_size = SZ_4K;
/* eDMA region can be mapped to a custom base address */
if (!pci->edma.reg_base) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
if (res) {
pci->edma.reg_base = devm_ioremap_resource(pci->dev, res);
if (IS_ERR(pci->edma.reg_base))
return PTR_ERR(pci->edma.reg_base);
} else if (pci->atu_size >= 2 * DEFAULT_DBI_DMA_OFFSET) {
pci->edma.reg_base = pci->atu_base + DEFAULT_DBI_DMA_OFFSET;
}
}
/* LLDD is supposed to manually switch the clocks and resets state */
if (dw_pcie_cap_is(pci, REQ_RES)) {
ret = dw_pcie_get_clocks(pci);
if (ret)
return ret;
ret = dw_pcie_get_resets(pci);
if (ret)
return ret;
}
if (pci->link_gen < 1)
pci->link_gen = of_pci_get_max_link_speed(np);
of_property_read_u32(np, "num-lanes", &pci->num_lanes);
if (of_property_read_bool(np, "snps,enable-cdm-check"))
dw_pcie_cap_set(pci, CDM_CHECK);
return 0;
}
void dw_pcie_version_detect(struct dw_pcie *pci)
{
u32 ver;
/* The content of the CSR is zero on DWC PCIe older than v4.70a */
ver = dw_pcie_readl_dbi(pci, PCIE_VERSION_NUMBER);
if (!ver)
return;
if (pci->version && pci->version != ver)
dev_warn(pci->dev, "Versions don't match (%08x != %08x)\n",
pci->version, ver);
else
pci->version = ver;
ver = dw_pcie_readl_dbi(pci, PCIE_VERSION_TYPE);
if (pci->type && pci->type != ver)
dev_warn(pci->dev, "Types don't match (%08x != %08x)\n",
pci->type, ver);
else
pci->type = ver;
}
/*
* These interfaces resemble the pci_find_*capability() interfaces, but these
* are for configuring host controllers, which are bridges *to* PCI devices but
* are not PCI devices themselves.
*/
static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr,
u8 cap)
{
u8 cap_id, next_cap_ptr;
u16 reg;
if (!cap_ptr)
return 0;
reg = dw_pcie_readw_dbi(pci, cap_ptr);
cap_id = (reg & 0x00ff);
if (cap_id > PCI_CAP_ID_MAX)
return 0;
if (cap_id == cap)
return cap_ptr;
next_cap_ptr = (reg & 0xff00) >> 8;
return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
}
u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap)
{
u8 next_cap_ptr;
u16 reg;
reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST);
next_cap_ptr = (reg & 0x00ff);
return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
}
EXPORT_SYMBOL_GPL(dw_pcie_find_capability);
static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start,
u8 cap)
{
u32 header;
int ttl;
int pos = PCI_CFG_SPACE_SIZE;
/* minimum 8 bytes per capability */
ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
if (start)
pos = start;
header = dw_pcie_readl_dbi(pci, pos);
/*
* If we have no capabilities, this is indicated by cap ID,
* cap version and next pointer all being 0.
*/
if (header == 0)
return 0;
while (ttl-- > 0) {
if (PCI_EXT_CAP_ID(header) == cap && pos != start)
return pos;
pos = PCI_EXT_CAP_NEXT(header);
if (pos < PCI_CFG_SPACE_SIZE)
break;
header = dw_pcie_readl_dbi(pci, pos);
}
return 0;
}
u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap)
{
return dw_pcie_find_next_ext_capability(pci, 0, cap);
}
EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability);
int dw_pcie_read(void __iomem *addr, int size, u32 *val)
{
if (!IS_ALIGNED((uintptr_t)addr, size)) {
*val = 0;
return PCIBIOS_BAD_REGISTER_NUMBER;
}
if (size == 4) {
*val = readl(addr);
} else if (size == 2) {
*val = readw(addr);
} else if (size == 1) {
*val = readb(addr);
} else {
*val = 0;
return PCIBIOS_BAD_REGISTER_NUMBER;
}
return PCIBIOS_SUCCESSFUL;
}
EXPORT_SYMBOL_GPL(dw_pcie_read);
int dw_pcie_write(void __iomem *addr, int size, u32 val)
{
if (!IS_ALIGNED((uintptr_t)addr, size))
return PCIBIOS_BAD_REGISTER_NUMBER;
if (size == 4)
writel(val, addr);
else if (size == 2)
writew(val, addr);
else if (size == 1)
writeb(val, addr);
else
return PCIBIOS_BAD_REGISTER_NUMBER;
return PCIBIOS_SUCCESSFUL;
}
EXPORT_SYMBOL_GPL(dw_pcie_write);
u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size)
{
int ret;
u32 val;
if (pci->ops && pci->ops->read_dbi)
return pci->ops->read_dbi(pci, pci->dbi_base, reg, size);
ret = dw_pcie_read(pci->dbi_base + reg, size, &val);
if (ret)
dev_err(pci->dev, "Read DBI address failed\n");
return val;
}
EXPORT_SYMBOL_GPL(dw_pcie_read_dbi);
void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
{
int ret;
if (pci->ops && pci->ops->write_dbi) {
pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val);
return;
}
ret = dw_pcie_write(pci->dbi_base + reg, size, val);
if (ret)
dev_err(pci->dev, "Write DBI address failed\n");
}
EXPORT_SYMBOL_GPL(dw_pcie_write_dbi);
void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
{
int ret;
if (pci->ops && pci->ops->write_dbi2) {
pci->ops->write_dbi2(pci, pci->dbi_base2, reg, size, val);
return;
}
ret = dw_pcie_write(pci->dbi_base2 + reg, size, val);
if (ret)
dev_err(pci->dev, "write DBI address failed\n");
}
EXPORT_SYMBOL_GPL(dw_pcie_write_dbi2);
static inline void __iomem *dw_pcie_select_atu(struct dw_pcie *pci, u32 dir,
u32 index)
{
if (dw_pcie_cap_is(pci, IATU_UNROLL))
return pci->atu_base + PCIE_ATU_UNROLL_BASE(dir, index);
dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, dir | index);
return pci->atu_base;
}
static u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 dir, u32 index, u32 reg)
{
void __iomem *base;
int ret;
u32 val;
base = dw_pcie_select_atu(pci, dir, index);
if (pci->ops && pci->ops->read_dbi)
return pci->ops->read_dbi(pci, base, reg, 4);
ret = dw_pcie_read(base + reg, 4, &val);
if (ret)
dev_err(pci->dev, "Read ATU address failed\n");
return val;
}
static void dw_pcie_writel_atu(struct dw_pcie *pci, u32 dir, u32 index,
u32 reg, u32 val)
{
void __iomem *base;
int ret;
base = dw_pcie_select_atu(pci, dir, index);
if (pci->ops && pci->ops->write_dbi) {
pci->ops->write_dbi(pci, base, reg, 4, val);
return;
}
ret = dw_pcie_write(base + reg, 4, val);
if (ret)
dev_err(pci->dev, "Write ATU address failed\n");
}
static inline u32 dw_pcie_readl_atu_ob(struct dw_pcie *pci, u32 index, u32 reg)
{
return dw_pcie_readl_atu(pci, PCIE_ATU_REGION_DIR_OB, index, reg);
}
static inline void dw_pcie_writel_atu_ob(struct dw_pcie *pci, u32 index, u32 reg,
u32 val)
{
dw_pcie_writel_atu(pci, PCIE_ATU_REGION_DIR_OB, index, reg, val);
}
static inline u32 dw_pcie_enable_ecrc(u32 val)
{
/*
* DesignWare core version 4.90A has a design issue where the 'TD'
* bit in the Control register-1 of the ATU outbound region acts
* like an override for the ECRC setting, i.e., the presence of TLP
* Digest (ECRC) in the outgoing TLPs is solely determined by this
* bit. This is contrary to the PCIe spec which says that the
* enablement of the ECRC is solely determined by the AER
* registers.
*
* Because of this, even when the ECRC is enabled through AER
* registers, the transactions going through ATU won't have TLP
* Digest as there is no way the PCI core AER code could program
* the TD bit which is specific to the DesignWare core.
*
* The best way to handle this scenario is to program the TD bit
* always. It affects only the traffic from root port to downstream
* devices.
*
* At this point,
* When ECRC is enabled in AER registers, everything works normally
* When ECRC is NOT enabled in AER registers, then,
* on Root Port:- TLP Digest (DWord size) gets appended to each packet
* even through it is not required. Since downstream
* TLPs are mostly for configuration accesses and BAR
* accesses, they are not in critical path and won't
* have much negative effect on the performance.
* on End Point:- TLP Digest is received for some/all the packets coming
* from the root port. TLP Digest is ignored because,
* as per the PCIe Spec r5.0 v1.0 section 2.2.3
* "TLP Digest Rules", when an endpoint receives TLP
* Digest when its ECRC check functionality is disabled
* in AER registers, received TLP Digest is just ignored.
* Since there is no issue or error reported either side, best way to
* handle the scenario is to program TD bit by default.
*/
return val | PCIE_ATU_TD;
}
static int __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
int index, int type, u64 cpu_addr,
u64 pci_addr, u64 size)
{
u32 retries, val;
u64 limit_addr;
if (pci->ops && pci->ops->cpu_addr_fixup)
cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr);
limit_addr = cpu_addr + size - 1;
if ((limit_addr & ~pci->region_limit) != (cpu_addr & ~pci->region_limit) ||
!IS_ALIGNED(cpu_addr, pci->region_align) ||
!IS_ALIGNED(pci_addr, pci->region_align) || !size) {
return -EINVAL;
}
dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LOWER_BASE,
lower_32_bits(cpu_addr));
dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_BASE,
upper_32_bits(cpu_addr));
dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LIMIT,
lower_32_bits(limit_addr));
if (dw_pcie_ver_is_ge(pci, 460A))
dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_LIMIT,
upper_32_bits(limit_addr));
dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LOWER_TARGET,
lower_32_bits(pci_addr));
dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_TARGET,
upper_32_bits(pci_addr));
val = type | PCIE_ATU_FUNC_NUM(func_no);
if (upper_32_bits(limit_addr) > upper_32_bits(cpu_addr) &&
dw_pcie_ver_is_ge(pci, 460A))
val |= PCIE_ATU_INCREASE_REGION_SIZE;
if (dw_pcie_ver_is(pci, 490A))
val = dw_pcie_enable_ecrc(val);
dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL1, val);
dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2, PCIE_ATU_ENABLE);
/*
* Make sure ATU enable takes effect before any subsequent config
* and I/O accesses.
*/
for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
val = dw_pcie_readl_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2);
if (val & PCIE_ATU_ENABLE)
return 0;
mdelay(LINK_WAIT_IATU);
}
dev_err(pci->dev, "Outbound iATU is not being enabled\n");
return -ETIMEDOUT;
}
int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
u64 cpu_addr, u64 pci_addr, u64 size)
{
return __dw_pcie_prog_outbound_atu(pci, 0, index, type,
cpu_addr, pci_addr, size);
}
int dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
int type, u64 cpu_addr, u64 pci_addr,
u64 size)
{
return __dw_pcie_prog_outbound_atu(pci, func_no, index, type,
cpu_addr, pci_addr, size);
}
static inline u32 dw_pcie_readl_atu_ib(struct dw_pcie *pci, u32 index, u32 reg)
{
return dw_pcie_readl_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg);
}
static inline void dw_pcie_writel_atu_ib(struct dw_pcie *pci, u32 index, u32 reg,
u32 val)
{
dw_pcie_writel_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg, val);
}
int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int type,
u64 cpu_addr, u64 pci_addr, u64 size)
{
u64 limit_addr = pci_addr + size - 1;
u32 retries, val;
if ((limit_addr & ~pci->region_limit) != (pci_addr & ~pci->region_limit) ||
!IS_ALIGNED(cpu_addr, pci->region_align) ||
!IS_ALIGNED(pci_addr, pci->region_align) || !size) {
return -EINVAL;
}
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_BASE,
lower_32_bits(pci_addr));
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_BASE,
upper_32_bits(pci_addr));
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LIMIT,
lower_32_bits(limit_addr));
if (dw_pcie_ver_is_ge(pci, 460A))
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_LIMIT,
upper_32_bits(limit_addr));
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_TARGET,
lower_32_bits(cpu_addr));
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET,
upper_32_bits(cpu_addr));
val = type;
if (upper_32_bits(limit_addr) > upper_32_bits(pci_addr) &&
dw_pcie_ver_is_ge(pci, 460A))
val |= PCIE_ATU_INCREASE_REGION_SIZE;
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL1, val);
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2, PCIE_ATU_ENABLE);
/*
* Make sure ATU enable takes effect before any subsequent config
* and I/O accesses.
*/
for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
val = dw_pcie_readl_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2);
if (val & PCIE_ATU_ENABLE)
return 0;
mdelay(LINK_WAIT_IATU);
}
dev_err(pci->dev, "Inbound iATU is not being enabled\n");
return -ETIMEDOUT;
}
int dw_pcie_prog_ep_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
int type, u64 cpu_addr, u8 bar)
{
u32 retries, val;
if (!IS_ALIGNED(cpu_addr, pci->region_align))
return -EINVAL;
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_TARGET,
lower_32_bits(cpu_addr));
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET,
upper_32_bits(cpu_addr));
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL1, type |
PCIE_ATU_FUNC_NUM(func_no));
dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2,
PCIE_ATU_ENABLE | PCIE_ATU_FUNC_NUM_MATCH_EN |
PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));
/*
* Make sure ATU enable takes effect before any subsequent config
* and I/O accesses.
*/
for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
val = dw_pcie_readl_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2);
if (val & PCIE_ATU_ENABLE)
return 0;
mdelay(LINK_WAIT_IATU);
}
dev_err(pci->dev, "Inbound iATU is not being enabled\n");
return -ETIMEDOUT;
}
void dw_pcie_disable_atu(struct dw_pcie *pci, u32 dir, int index)
{
dw_pcie_writel_atu(pci, dir, index, PCIE_ATU_REGION_CTRL2, 0);
}
int dw_pcie_wait_for_link(struct dw_pcie *pci)
{
u32 offset, val;
int retries;
/* Check if the link is up or not */
for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
if (dw_pcie_link_up(pci))
break;
usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
}
if (retries >= LINK_WAIT_MAX_RETRIES) {
dev_info(pci->dev, "Phy link never came up\n");
return -ETIMEDOUT;
}
offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
val = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA);
dev_info(pci->dev, "PCIe Gen.%u x%u link up\n",
FIELD_GET(PCI_EXP_LNKSTA_CLS, val),
FIELD_GET(PCI_EXP_LNKSTA_NLW, val));
return 0;
}
EXPORT_SYMBOL_GPL(dw_pcie_wait_for_link);
int dw_pcie_link_up(struct dw_pcie *pci)
{
u32 val;
if (pci->ops && pci->ops->link_up)
return pci->ops->link_up(pci);
val = dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1);
return ((val & PCIE_PORT_DEBUG1_LINK_UP) &&
(!(val & PCIE_PORT_DEBUG1_LINK_IN_TRAINING)));
}
EXPORT_SYMBOL_GPL(dw_pcie_link_up);
void dw_pcie_upconfig_setup(struct dw_pcie *pci)
{
u32 val;
val = dw_pcie_readl_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL);
val |= PORT_MLTI_UPCFG_SUPPORT;
dw_pcie_writel_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL, val);
}
EXPORT_SYMBOL_GPL(dw_pcie_upconfig_setup);
static void dw_pcie_link_set_max_speed(struct dw_pcie *pci, u32 link_gen)
{
u32 cap, ctrl2, link_speed;
u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
cap = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
ctrl2 = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCTL2);
ctrl2 &= ~PCI_EXP_LNKCTL2_TLS;
switch (pcie_link_speed[link_gen]) {
case PCIE_SPEED_2_5GT:
link_speed = PCI_EXP_LNKCTL2_TLS_2_5GT;
break;
case PCIE_SPEED_5_0GT:
link_speed = PCI_EXP_LNKCTL2_TLS_5_0GT;
break;
case PCIE_SPEED_8_0GT:
link_speed = PCI_EXP_LNKCTL2_TLS_8_0GT;
break;
case PCIE_SPEED_16_0GT:
link_speed = PCI_EXP_LNKCTL2_TLS_16_0GT;
break;
default:
/* Use hardware capability */
link_speed = FIELD_GET(PCI_EXP_LNKCAP_SLS, cap);
ctrl2 &= ~PCI_EXP_LNKCTL2_HASD;
break;
}
dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCTL2, ctrl2 | link_speed);
cap &= ~((u32)PCI_EXP_LNKCAP_SLS);
dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, cap | link_speed);
}
static void dw_pcie_link_set_max_link_width(struct dw_pcie *pci, u32 num_lanes)
{
u32 lnkcap, lwsc, plc;
u8 cap;
if (!num_lanes)
return;
/* Set the number of lanes */
plc = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
plc &= ~PORT_LINK_FAST_LINK_MODE;
plc &= ~PORT_LINK_MODE_MASK;
/* Set link width speed control register */
lwsc = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
lwsc &= ~PORT_LOGIC_LINK_WIDTH_MASK;
switch (num_lanes) {
case 1:
plc |= PORT_LINK_MODE_1_LANES;
lwsc |= PORT_LOGIC_LINK_WIDTH_1_LANES;
break;
case 2:
plc |= PORT_LINK_MODE_2_LANES;
lwsc |= PORT_LOGIC_LINK_WIDTH_2_LANES;
break;
case 4:
plc |= PORT_LINK_MODE_4_LANES;
lwsc |= PORT_LOGIC_LINK_WIDTH_4_LANES;
break;
case 8:
plc |= PORT_LINK_MODE_8_LANES;
lwsc |= PORT_LOGIC_LINK_WIDTH_8_LANES;
break;
default:
dev_err(pci->dev, "num-lanes %u: invalid value\n", num_lanes);
return;
}
dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, plc);
dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, lwsc);
cap = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
lnkcap = dw_pcie_readl_dbi(pci, cap + PCI_EXP_LNKCAP);
lnkcap &= ~PCI_EXP_LNKCAP_MLW;
lnkcap |= FIELD_PREP(PCI_EXP_LNKCAP_MLW, num_lanes);
dw_pcie_writel_dbi(pci, cap + PCI_EXP_LNKCAP, lnkcap);
}
void dw_pcie_iatu_detect(struct dw_pcie *pci)
{
int max_region, ob, ib;
u32 val, min, dir;
u64 max;
val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
if (val == 0xFFFFFFFF) {
dw_pcie_cap_set(pci, IATU_UNROLL);
max_region = min((int)pci->atu_size / 512, 256);
} else {
pci->atu_base = pci->dbi_base + PCIE_ATU_VIEWPORT_BASE;
pci->atu_size = PCIE_ATU_VIEWPORT_SIZE;
dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, 0xFF);
max_region = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT) + 1;
}
for (ob = 0; ob < max_region; ob++) {
dw_pcie_writel_atu_ob(pci, ob, PCIE_ATU_LOWER_TARGET, 0x11110000);
val = dw_pcie_readl_atu_ob(pci, ob, PCIE_ATU_LOWER_TARGET);
if (val != 0x11110000)
break;
}
for (ib = 0; ib < max_region; ib++) {
dw_pcie_writel_atu_ib(pci, ib, PCIE_ATU_LOWER_TARGET, 0x11110000);
val = dw_pcie_readl_atu_ib(pci, ib, PCIE_ATU_LOWER_TARGET);
if (val != 0x11110000)
break;
}
if (ob) {
dir = PCIE_ATU_REGION_DIR_OB;
} else if (ib) {
dir = PCIE_ATU_REGION_DIR_IB;
} else {
dev_err(pci->dev, "No iATU regions found\n");
return;
}
dw_pcie_writel_atu(pci, dir, 0, PCIE_ATU_LIMIT, 0x0);
min = dw_pcie_readl_atu(pci, dir, 0, PCIE_ATU_LIMIT);
if (dw_pcie_ver_is_ge(pci, 460A)) {
dw_pcie_writel_atu(pci, dir, 0, PCIE_ATU_UPPER_LIMIT, 0xFFFFFFFF);
max = dw_pcie_readl_atu(pci, dir, 0, PCIE_ATU_UPPER_LIMIT);
} else {
max = 0;
}
pci->num_ob_windows = ob;
pci->num_ib_windows = ib;
pci->region_align = 1 << fls(min);
pci->region_limit = (max << 32) | (SZ_4G - 1);
dev_info(pci->dev, "iATU: unroll %s, %u ob, %u ib, align %uK, limit %lluG\n",
dw_pcie_cap_is(pci, IATU_UNROLL) ? "T" : "F",
pci->num_ob_windows, pci->num_ib_windows,
pci->region_align / SZ_1K, (pci->region_limit + 1) / SZ_1G);
}
static u32 dw_pcie_readl_dma(struct dw_pcie *pci, u32 reg)
{
u32 val = 0;
int ret;
if (pci->ops && pci->ops->read_dbi)
return pci->ops->read_dbi(pci, pci->edma.reg_base, reg, 4);
ret = dw_pcie_read(pci->edma.reg_base + reg, 4, &val);
if (ret)
dev_err(pci->dev, "Read DMA address failed\n");
return val;
}
static int dw_pcie_edma_irq_vector(struct device *dev, unsigned int nr)
{
struct platform_device *pdev = to_platform_device(dev);
char name[6];
int ret;
if (nr >= EDMA_MAX_WR_CH + EDMA_MAX_RD_CH)
return -EINVAL;
ret = platform_get_irq_byname_optional(pdev, "dma");
if (ret > 0)
return ret;
snprintf(name, sizeof(name), "dma%u", nr);
return platform_get_irq_byname_optional(pdev, name);
}
static struct dw_edma_plat_ops dw_pcie_edma_ops = {
.irq_vector = dw_pcie_edma_irq_vector,
};
static int dw_pcie_edma_find_chip(struct dw_pcie *pci)
{
u32 val;
/*
* Indirect eDMA CSRs access has been completely removed since v5.40a
* thus no space is now reserved for the eDMA channels viewport and
* former DMA CTRL register is no longer fixed to FFs.
*
* Note that Renesas R-Car S4-8's PCIe controllers for unknown reason
* have zeros in the eDMA CTRL register even though the HW-manual
* explicitly states there must FFs if the unrolled mapping is enabled.
* For such cases the low-level drivers are supposed to manually
* activate the unrolled mapping to bypass the auto-detection procedure.
*/
if (dw_pcie_ver_is_ge(pci, 540A) || dw_pcie_cap_is(pci, EDMA_UNROLL))
val = 0xFFFFFFFF;
else
val = dw_pcie_readl_dbi(pci, PCIE_DMA_VIEWPORT_BASE + PCIE_DMA_CTRL);
if (val == 0xFFFFFFFF && pci->edma.reg_base) {
pci->edma.mf = EDMA_MF_EDMA_UNROLL;
val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL);
} else if (val != 0xFFFFFFFF) {
pci->edma.mf = EDMA_MF_EDMA_LEGACY;
pci->edma.reg_base = pci->dbi_base + PCIE_DMA_VIEWPORT_BASE;
} else {
return -ENODEV;
}
pci->edma.dev = pci->dev;
if (!pci->edma.ops)
pci->edma.ops = &dw_pcie_edma_ops;
pci->edma.flags |= DW_EDMA_CHIP_LOCAL;
pci->edma.ll_wr_cnt = FIELD_GET(PCIE_DMA_NUM_WR_CHAN, val);
pci->edma.ll_rd_cnt = FIELD_GET(PCIE_DMA_NUM_RD_CHAN, val);
/* Sanity check the channels count if the mapping was incorrect */
if (!pci->edma.ll_wr_cnt || pci->edma.ll_wr_cnt > EDMA_MAX_WR_CH ||
!pci->edma.ll_rd_cnt || pci->edma.ll_rd_cnt > EDMA_MAX_RD_CH)
return -EINVAL;
return 0;
}
static int dw_pcie_edma_irq_verify(struct dw_pcie *pci)
{
struct platform_device *pdev = to_platform_device(pci->dev);
u16 ch_cnt = pci->edma.ll_wr_cnt + pci->edma.ll_rd_cnt;
char name[6];
int ret;
if (pci->edma.nr_irqs == 1)
return 0;
else if (pci->edma.nr_irqs > 1)
return pci->edma.nr_irqs != ch_cnt ? -EINVAL : 0;
ret = platform_get_irq_byname_optional(pdev, "dma");
if (ret > 0) {
pci->edma.nr_irqs = 1;
return 0;
}
for (; pci->edma.nr_irqs < ch_cnt; pci->edma.nr_irqs++) {
snprintf(name, sizeof(name), "dma%d", pci->edma.nr_irqs);
ret = platform_get_irq_byname_optional(pdev, name);
if (ret <= 0)
return -EINVAL;
}
return 0;
}
static int dw_pcie_edma_ll_alloc(struct dw_pcie *pci)
{
struct dw_edma_region *ll;
dma_addr_t paddr;
int i;
for (i = 0; i < pci->edma.ll_wr_cnt; i++) {
ll = &pci->edma.ll_region_wr[i];
ll->sz = DMA_LLP_MEM_SIZE;
ll->vaddr.mem = dmam_alloc_coherent(pci->dev, ll->sz,
&paddr, GFP_KERNEL);
if (!ll->vaddr.mem)
return -ENOMEM;
ll->paddr = paddr;
}
for (i = 0; i < pci->edma.ll_rd_cnt; i++) {
ll = &pci->edma.ll_region_rd[i];
ll->sz = DMA_LLP_MEM_SIZE;
ll->vaddr.mem = dmam_alloc_coherent(pci->dev, ll->sz,
&paddr, GFP_KERNEL);
if (!ll->vaddr.mem)
return -ENOMEM;
ll->paddr = paddr;
}
return 0;
}
int dw_pcie_edma_detect(struct dw_pcie *pci)
{
int ret;
/* Don't fail if no eDMA was found (for the backward compatibility) */
ret = dw_pcie_edma_find_chip(pci);
if (ret)
return 0;
/* Don't fail on the IRQs verification (for the backward compatibility) */
ret = dw_pcie_edma_irq_verify(pci);
if (ret) {
dev_err(pci->dev, "Invalid eDMA IRQs found\n");
return 0;
}
ret = dw_pcie_edma_ll_alloc(pci);
if (ret) {
dev_err(pci->dev, "Couldn't allocate LLP memory\n");
return ret;
}
/* Don't fail if the DW eDMA driver can't find the device */
ret = dw_edma_probe(&pci->edma);
if (ret && ret != -ENODEV) {
dev_err(pci->dev, "Couldn't register eDMA device\n");
return ret;
}
dev_info(pci->dev, "eDMA: unroll %s, %hu wr, %hu rd\n",
pci->edma.mf == EDMA_MF_EDMA_UNROLL ? "T" : "F",
pci->edma.ll_wr_cnt, pci->edma.ll_rd_cnt);
return 0;
}
void dw_pcie_edma_remove(struct dw_pcie *pci)
{
dw_edma_remove(&pci->edma);
}
void dw_pcie_setup(struct dw_pcie *pci)
{
u32 val;
if (pci->link_gen > 0)
dw_pcie_link_set_max_speed(pci, pci->link_gen);
/* Configure Gen1 N_FTS */
if (pci->n_fts[0]) {
val = dw_pcie_readl_dbi(pci, PCIE_PORT_AFR);
val &= ~(PORT_AFR_N_FTS_MASK | PORT_AFR_CC_N_FTS_MASK);
val |= PORT_AFR_N_FTS(pci->n_fts[0]);
val |= PORT_AFR_CC_N_FTS(pci->n_fts[0]);
dw_pcie_writel_dbi(pci, PCIE_PORT_AFR, val);
}
/* Configure Gen2+ N_FTS */
if (pci->n_fts[1]) {
val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
val &= ~PORT_LOGIC_N_FTS_MASK;
val |= pci->n_fts[1];
dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
}
if (dw_pcie_cap_is(pci, CDM_CHECK)) {
val = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS);
val |= PCIE_PL_CHK_REG_CHK_REG_CONTINUOUS |
PCIE_PL_CHK_REG_CHK_REG_START;
dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, val);
}
val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
val &= ~PORT_LINK_FAST_LINK_MODE;
val |= PORT_LINK_DLL_LINK_EN;
dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);
dw_pcie_link_set_max_link_width(pci, pci->num_lanes);
}