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u-boot/drivers/pci/pcie_rockchip.c
Pali Rohár a4bc38da27 pci: Add standard PCIe ECAM macros 
Lot of PCIe controllers are using ECAM addressing. So add common ECAM
macros into U-Boot's pci.h header file which can be suitable for most
PCI controller drivers.

Replace custom ECAM address macros in every PCI controller driver by new
ECAM macros from U-Boot's pci.h header file.

Similar macros are defined also in Linux kernel. There is a small
difference between Linux and these new U-Boot macros.

U-Boot's PCIE_ECAM_OFFSET() takes device and function numbers in separate
arguments. Linux's PCIE_ECAM_OFFSET() takes device and function numbers
encoded in one argument. The reason is that U-Boot's PCI_DEVFN() macro is
different than Linux's PCI_SLOT() macro. So having device and function
numbers in separate arguments makes code more straightforward.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-11-17 17:04:58 -05:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Rockchip AXI PCIe host controller driver
*
* Copyright (c) 2016 Rockchip, Inc.
* Copyright (c) 2020 Amarula Solutions(India)
* Copyright (c) 2020 Jagan Teki <jagan@amarulasolutions.com>
* Copyright (c) 2019 Patrick Wildt <patrick@blueri.se>
* Copyright (c) 2018 Mark Kettenis <kettenis@openbsd.org>
*
* Bits taken from Linux Rockchip PCIe host controller.
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <asm/global_data.h>
#include <dm/device_compat.h>
#include <generic-phy.h>
#include <pci.h>
#include <power-domain.h>
#include <power/regulator.h>
#include <reset.h>
#include <syscon.h>
#include <asm/io.h>
#include <asm-generic/gpio.h>
#include <asm/arch-rockchip/clock.h>
#include <linux/iopoll.h>
DECLARE_GLOBAL_DATA_PTR;
#define HIWORD_UPDATE(mask, val) (((mask) << 16) | (val))
#define HIWORD_UPDATE_BIT(val) HIWORD_UPDATE(val, val)
#define ENCODE_LANES(x) ((((x) >> 1) & 3) << 4)
#define PCIE_CLIENT_BASE 0x0
#define PCIE_CLIENT_CONFIG (PCIE_CLIENT_BASE + 0x00)
#define PCIE_CLIENT_CONF_ENABLE HIWORD_UPDATE_BIT(0x0001)
#define PCIE_CLIENT_LINK_TRAIN_ENABLE HIWORD_UPDATE_BIT(0x0002)
#define PCIE_CLIENT_MODE_RC HIWORD_UPDATE_BIT(0x0040)
#define PCIE_CLIENT_GEN_SEL_1 HIWORD_UPDATE(0x0080, 0)
#define PCIE_CLIENT_BASIC_STATUS1 0x0048
#define PCIE_CLIENT_LINK_STATUS_UP GENMASK(21, 20)
#define PCIE_CLIENT_LINK_STATUS_MASK GENMASK(21, 20)
#define PCIE_LINK_UP(x) \
(((x) & PCIE_CLIENT_LINK_STATUS_MASK) == PCIE_CLIENT_LINK_STATUS_UP)
#define PCIE_RC_NORMAL_BASE 0x800000
#define PCIE_LM_BASE 0x900000
#define PCIE_LM_VENDOR_ID (PCIE_LM_BASE + 0x44)
#define PCIE_LM_VENDOR_ROCKCHIP 0x1d87
#define PCIE_LM_RCBAR (PCIE_LM_BASE + 0x300)
#define PCIE_LM_RCBARPIE BIT(19)
#define PCIE_LM_RCBARPIS BIT(20)
#define PCIE_RC_BASE 0xa00000
#define PCIE_RC_CONFIG_DCR (PCIE_RC_BASE + 0x0c4)
#define PCIE_RC_CONFIG_DCR_CSPL_SHIFT 18
#define PCIE_RC_CONFIG_DCR_CPLS_SHIFT 26
#define PCIE_RC_PCIE_LCAP (PCIE_RC_BASE + 0x0cc)
#define PCIE_RC_PCIE_LCAP_APMS_L0S BIT(10)
#define PCIE_ATR_BASE 0xc00000
#define PCIE_ATR_OB_ADDR0(i) (PCIE_ATR_BASE + 0x000 + (i) * 0x20)
#define PCIE_ATR_OB_ADDR1(i) (PCIE_ATR_BASE + 0x004 + (i) * 0x20)
#define PCIE_ATR_OB_DESC0(i) (PCIE_ATR_BASE + 0x008 + (i) * 0x20)
#define PCIE_ATR_OB_DESC1(i) (PCIE_ATR_BASE + 0x00c + (i) * 0x20)
#define PCIE_ATR_IB_ADDR0(i) (PCIE_ATR_BASE + 0x800 + (i) * 0x8)
#define PCIE_ATR_IB_ADDR1(i) (PCIE_ATR_BASE + 0x804 + (i) * 0x8)
#define PCIE_ATR_HDR_MEM 0x2
#define PCIE_ATR_HDR_IO 0x6
#define PCIE_ATR_HDR_CFG_TYPE0 0xa
#define PCIE_ATR_HDR_CFG_TYPE1 0xb
#define PCIE_ATR_HDR_RID BIT(23)
#define PCIE_ATR_OB_REGION0_SIZE (32 * 1024 * 1024)
#define PCIE_ATR_OB_REGION_SIZE (1 * 1024 * 1024)
struct rockchip_pcie {
fdt_addr_t axi_base;
fdt_addr_t apb_base;
int first_busno;
struct udevice *dev;
/* resets */
struct reset_ctl core_rst;
struct reset_ctl mgmt_rst;
struct reset_ctl mgmt_sticky_rst;
struct reset_ctl pipe_rst;
struct reset_ctl pm_rst;
struct reset_ctl pclk_rst;
struct reset_ctl aclk_rst;
/* gpio */
struct gpio_desc ep_gpio;
/* vpcie regulators */
struct udevice *vpcie12v;
struct udevice *vpcie3v3;
struct udevice *vpcie1v8;
struct udevice *vpcie0v9;
/* phy */
struct phy pcie_phy;
};
static int rockchip_pcie_rd_conf(const struct udevice *udev, pci_dev_t bdf,
uint offset, ulong *valuep,
enum pci_size_t size)
{
struct rockchip_pcie *priv = dev_get_priv(udev);
unsigned int bus = PCI_BUS(bdf);
unsigned int dev = PCI_DEV(bdf);
int where = PCIE_ECAM_OFFSET(PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), offset & ~0x3);
ulong value;
if (bus == priv->first_busno && dev == 0) {
value = readl(priv->apb_base + PCIE_RC_NORMAL_BASE + where);
*valuep = pci_conv_32_to_size(value, offset, size);
return 0;
}
if ((bus == priv->first_busno + 1) && dev == 0) {
value = readl(priv->axi_base + where);
*valuep = pci_conv_32_to_size(value, offset, size);
return 0;
}
*valuep = pci_get_ff(size);
return 0;
}
static int rockchip_pcie_wr_conf(struct udevice *udev, pci_dev_t bdf,
uint offset, ulong value,
enum pci_size_t size)
{
struct rockchip_pcie *priv = dev_get_priv(udev);
unsigned int bus = PCI_BUS(bdf);
unsigned int dev = PCI_DEV(bdf);
int where = PCIE_ECAM_OFFSET(PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), offset & ~0x3);
ulong old;
if (bus == priv->first_busno && dev == 0) {
old = readl(priv->apb_base + PCIE_RC_NORMAL_BASE + where);
value = pci_conv_size_to_32(old, value, offset, size);
writel(value, priv->apb_base + PCIE_RC_NORMAL_BASE + where);
return 0;
}
if ((bus == priv->first_busno + 1) && dev == 0) {
old = readl(priv->axi_base + where);
value = pci_conv_size_to_32(old, value, offset, size);
writel(value, priv->axi_base + where);
return 0;
}
return 0;
}
static int rockchip_pcie_atr_init(struct rockchip_pcie *priv)
{
struct udevice *ctlr = pci_get_controller(priv->dev);
struct pci_controller *hose = dev_get_uclass_priv(ctlr);
u64 addr, size, offset;
u32 type;
int i, region;
/* Use region 0 to map PCI configuration space. */
writel(25 - 1, priv->apb_base + PCIE_ATR_OB_ADDR0(0));
writel(0, priv->apb_base + PCIE_ATR_OB_ADDR1(0));
writel(PCIE_ATR_HDR_CFG_TYPE0 | PCIE_ATR_HDR_RID,
priv->apb_base + PCIE_ATR_OB_DESC0(0));
writel(0, priv->apb_base + PCIE_ATR_OB_DESC1(0));
for (i = 0; i < hose->region_count; i++) {
if (hose->regions[i].flags == PCI_REGION_SYS_MEMORY)
continue;
if (hose->regions[i].flags == PCI_REGION_IO)
type = PCIE_ATR_HDR_IO;
else
type = PCIE_ATR_HDR_MEM;
/* Only support identity mappings. */
if (hose->regions[i].bus_start !=
hose->regions[i].phys_start)
return -EINVAL;
/* Only support mappings aligned on a region boundary. */
addr = hose->regions[i].bus_start;
if (addr & (PCIE_ATR_OB_REGION_SIZE - 1))
return -EINVAL;
/* Mappings should lie between AXI and APB regions. */
size = hose->regions[i].size;
if (addr < (u64)priv->axi_base + PCIE_ATR_OB_REGION0_SIZE)
return -EINVAL;
if (addr + size > (u64)priv->apb_base)
return -EINVAL;
offset = addr - (u64)priv->axi_base - PCIE_ATR_OB_REGION0_SIZE;
region = 1 + (offset / PCIE_ATR_OB_REGION_SIZE);
while (size > 0) {
writel(32 - 1,
priv->apb_base + PCIE_ATR_OB_ADDR0(region));
writel(0, priv->apb_base + PCIE_ATR_OB_ADDR1(region));
writel(type | PCIE_ATR_HDR_RID,
priv->apb_base + PCIE_ATR_OB_DESC0(region));
writel(0, priv->apb_base + PCIE_ATR_OB_DESC1(region));
addr += PCIE_ATR_OB_REGION_SIZE;
size -= PCIE_ATR_OB_REGION_SIZE;
region++;
}
}
/* Passthrough inbound translations unmodified. */
writel(32 - 1, priv->apb_base + PCIE_ATR_IB_ADDR0(2));
writel(0, priv->apb_base + PCIE_ATR_IB_ADDR1(2));
return 0;
}
static int rockchip_pcie_init_port(struct udevice *dev)
{
struct rockchip_pcie *priv = dev_get_priv(dev);
u32 cr, val, status;
int ret;
if (dm_gpio_is_valid(&priv->ep_gpio))
dm_gpio_set_value(&priv->ep_gpio, 0);
ret = reset_assert(&priv->aclk_rst);
if (ret) {
dev_err(dev, "failed to assert aclk reset (ret=%d)\n", ret);
return ret;
}
ret = reset_assert(&priv->pclk_rst);
if (ret) {
dev_err(dev, "failed to assert pclk reset (ret=%d)\n", ret);
return ret;
}
ret = reset_assert(&priv->pm_rst);
if (ret) {
dev_err(dev, "failed to assert pm reset (ret=%d)\n", ret);
return ret;
}
ret = generic_phy_init(&priv->pcie_phy);
if (ret) {
dev_err(dev, "failed to init phy (ret=%d)\n", ret);
goto err_exit_phy;
}
ret = reset_assert(&priv->core_rst);
if (ret) {
dev_err(dev, "failed to assert core reset (ret=%d)\n", ret);
goto err_exit_phy;
}
ret = reset_assert(&priv->mgmt_rst);
if (ret) {
dev_err(dev, "failed to assert mgmt reset (ret=%d)\n", ret);
goto err_exit_phy;
}
ret = reset_assert(&priv->mgmt_sticky_rst);
if (ret) {
dev_err(dev, "failed to assert mgmt-sticky reset (ret=%d)\n",
ret);
goto err_exit_phy;
}
ret = reset_assert(&priv->pipe_rst);
if (ret) {
dev_err(dev, "failed to assert pipe reset (ret=%d)\n", ret);
goto err_exit_phy;
}
udelay(10);
ret = reset_deassert(&priv->pm_rst);
if (ret) {
dev_err(dev, "failed to deassert pm reset (ret=%d)\n", ret);
goto err_exit_phy;
}
ret = reset_deassert(&priv->aclk_rst);
if (ret) {
dev_err(dev, "failed to deassert aclk reset (ret=%d)\n", ret);
goto err_exit_phy;
}
ret = reset_deassert(&priv->pclk_rst);
if (ret) {
dev_err(dev, "failed to deassert pclk reset (ret=%d)\n", ret);
goto err_exit_phy;
}
/* Select GEN1 for now */
cr = PCIE_CLIENT_GEN_SEL_1;
/* Set Root complex mode */
cr |= PCIE_CLIENT_CONF_ENABLE | PCIE_CLIENT_MODE_RC;
writel(cr, priv->apb_base + PCIE_CLIENT_CONFIG);
ret = generic_phy_power_on(&priv->pcie_phy);
if (ret) {
dev_err(dev, "failed to power on phy (ret=%d)\n", ret);
goto err_power_off_phy;
}
ret = reset_deassert(&priv->mgmt_sticky_rst);
if (ret) {
dev_err(dev, "failed to deassert mgmt-sticky reset (ret=%d)\n",
ret);
goto err_power_off_phy;
}
ret = reset_deassert(&priv->core_rst);
if (ret) {
dev_err(dev, "failed to deassert core reset (ret=%d)\n", ret);
goto err_power_off_phy;
}
ret = reset_deassert(&priv->mgmt_rst);
if (ret) {
dev_err(dev, "failed to deassert mgmt reset (ret=%d)\n", ret);
goto err_power_off_phy;
}
ret = reset_deassert(&priv->pipe_rst);
if (ret) {
dev_err(dev, "failed to deassert pipe reset (ret=%d)\n", ret);
goto err_power_off_phy;
}
/* Enable Gen1 training */
writel(PCIE_CLIENT_LINK_TRAIN_ENABLE,
priv->apb_base + PCIE_CLIENT_CONFIG);
if (dm_gpio_is_valid(&priv->ep_gpio))
dm_gpio_set_value(&priv->ep_gpio, 1);
ret = readl_poll_sleep_timeout
(priv->apb_base + PCIE_CLIENT_BASIC_STATUS1,
status, PCIE_LINK_UP(status), 20, 500 * 1000);
if (ret) {
dev_err(dev, "PCIe link training gen1 timeout!\n");
goto err_power_off_phy;
}
/* Initialize Root Complex registers. */
writel(PCIE_LM_VENDOR_ROCKCHIP, priv->apb_base + PCIE_LM_VENDOR_ID);
writel(PCI_CLASS_BRIDGE_PCI << 16,
priv->apb_base + PCIE_RC_BASE + PCI_CLASS_REVISION);
writel(PCIE_LM_RCBARPIE | PCIE_LM_RCBARPIS,
priv->apb_base + PCIE_LM_RCBAR);
if (dev_read_bool(dev, "aspm-no-l0s")) {
val = readl(priv->apb_base + PCIE_RC_PCIE_LCAP);
val &= ~PCIE_RC_PCIE_LCAP_APMS_L0S;
writel(val, priv->apb_base + PCIE_RC_PCIE_LCAP);
}
/* Configure Address Translation. */
ret = rockchip_pcie_atr_init(priv);
if (ret) {
dev_err(dev, "PCIE-%d: ATR init failed\n", dev_seq(dev));
goto err_power_off_phy;
}
return 0;
err_power_off_phy:
generic_phy_power_off(&priv->pcie_phy);
err_exit_phy:
generic_phy_exit(&priv->pcie_phy);
return ret;
}
static int rockchip_pcie_set_vpcie(struct udevice *dev)
{
struct rockchip_pcie *priv = dev_get_priv(dev);
int ret;
if (priv->vpcie3v3) {
ret = regulator_set_enable(priv->vpcie3v3, true);
if (ret) {
dev_err(dev, "failed to enable vpcie3v3 (ret=%d)\n",
ret);
return ret;
}
}
if (priv->vpcie1v8) {
ret = regulator_set_enable(priv->vpcie1v8, true);
if (ret) {
dev_err(dev, "failed to enable vpcie1v8 (ret=%d)\n",
ret);
goto err_disable_3v3;
}
}
if (priv->vpcie0v9) {
ret = regulator_set_enable(priv->vpcie0v9, true);
if (ret) {
dev_err(dev, "failed to enable vpcie0v9 (ret=%d)\n",
ret);
goto err_disable_1v8;
}
}
return 0;
err_disable_1v8:
if (priv->vpcie1v8)
regulator_set_enable(priv->vpcie1v8, false);
err_disable_3v3:
if (priv->vpcie3v3)
regulator_set_enable(priv->vpcie3v3, false);
return ret;
}
static int rockchip_pcie_parse_dt(struct udevice *dev)
{
struct rockchip_pcie *priv = dev_get_priv(dev);
int ret;
priv->axi_base = dev_read_addr_name(dev, "axi-base");
if (!priv->axi_base)
return -ENODEV;
priv->apb_base = dev_read_addr_name(dev, "apb-base");
if (!priv->axi_base)
return -ENODEV;
ret = gpio_request_by_name(dev, "ep-gpios", 0,
&priv->ep_gpio, GPIOD_IS_OUT);
if (ret) {
dev_err(dev, "failed to find ep-gpios property\n");
return ret;
}
ret = reset_get_by_name(dev, "core", &priv->core_rst);
if (ret) {
dev_err(dev, "failed to get core reset (ret=%d)\n", ret);
return ret;
}
ret = reset_get_by_name(dev, "mgmt", &priv->mgmt_rst);
if (ret) {
dev_err(dev, "failed to get mgmt reset (ret=%d)\n", ret);
return ret;
}
ret = reset_get_by_name(dev, "mgmt-sticky", &priv->mgmt_sticky_rst);
if (ret) {
dev_err(dev, "failed to get mgmt-sticky reset (ret=%d)\n", ret);
return ret;
}
ret = reset_get_by_name(dev, "pipe", &priv->pipe_rst);
if (ret) {
dev_err(dev, "failed to get pipe reset (ret=%d)\n", ret);
return ret;
}
ret = reset_get_by_name(dev, "pm", &priv->pm_rst);
if (ret) {
dev_err(dev, "failed to get pm reset (ret=%d)\n", ret);
return ret;
}
ret = reset_get_by_name(dev, "pclk", &priv->pclk_rst);
if (ret) {
dev_err(dev, "failed to get pclk reset (ret=%d)\n", ret);
return ret;
}
ret = reset_get_by_name(dev, "aclk", &priv->aclk_rst);
if (ret) {
dev_err(dev, "failed to get aclk reset (ret=%d)\n", ret);
return ret;
}
ret = device_get_supply_regulator(dev, "vpcie3v3-supply",
&priv->vpcie3v3);
if (ret && ret != -ENOENT) {
dev_err(dev, "failed to get vpcie3v3 supply (ret=%d)\n", ret);
return ret;
}
ret = device_get_supply_regulator(dev, "vpcie1v8-supply",
&priv->vpcie1v8);
if (ret && ret != -ENOENT) {
dev_err(dev, "failed to get vpcie1v8 supply (ret=%d)\n", ret);
return ret;
}
ret = device_get_supply_regulator(dev, "vpcie0v9-supply",
&priv->vpcie0v9);
if (ret && ret != -ENOENT) {
dev_err(dev, "failed to get vpcie0v9 supply (ret=%d)\n", ret);
return ret;
}
ret = generic_phy_get_by_index(dev, 0, &priv->pcie_phy);
if (ret) {
dev_err(dev, "failed to get pcie-phy (ret=%d)\n", ret);
return ret;
}
return 0;
}
static int rockchip_pcie_probe(struct udevice *dev)
{
struct rockchip_pcie *priv = dev_get_priv(dev);
struct udevice *ctlr = pci_get_controller(dev);
struct pci_controller *hose = dev_get_uclass_priv(ctlr);
int ret;
priv->first_busno = dev_seq(dev);
priv->dev = dev;
ret = rockchip_pcie_parse_dt(dev);
if (ret)
return ret;
ret = rockchip_pcie_set_vpcie(dev);
if (ret)
return ret;
ret = rockchip_pcie_init_port(dev);
if (ret)
return ret;
dev_info(dev, "PCIE-%d: Link up (Bus%d)\n",
dev_seq(dev), hose->first_busno);
return 0;
}
static const struct dm_pci_ops rockchip_pcie_ops = {
.read_config = rockchip_pcie_rd_conf,
.write_config = rockchip_pcie_wr_conf,
};
static const struct udevice_id rockchip_pcie_ids[] = {
{ .compatible = "rockchip,rk3399-pcie" },
{ }
};
U_BOOT_DRIVER(rockchip_pcie) = {
.name = "rockchip_pcie",
.id = UCLASS_PCI,
.of_match = rockchip_pcie_ids,
.ops = &rockchip_pcie_ops,
.probe = rockchip_pcie_probe,
.priv_auto = sizeof(struct rockchip_pcie),
};
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