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u-boot/drivers/pci/pcie_rockchip.c
Mark Kettenis dbc5e28604 pci: Make Rockchip PCIe voltage regulators optional 
The vpcie*-supply properties are optional and these are absent on
boards like the ROCKPro64 and Firefly RK3399 where the voltage is
supplied by always-on regulators that are already enabled upon
boot.  Make these regulators optional and properly check their
presence before attempting to enable them.

Makes PCIe work on un U-Boot on the boards mentioned above.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Marcin Juszkiewicz <marcin@juszkiewicz.com.pl>
2020-05-29 17:59:49 +08:00

498 lines
12 KiB
C
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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 <dm/device_compat.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>
#include "pcie_rockchip.h"
DECLARE_GLOBAL_DATA_PTR;
static int rockchip_pcie_off_conf(pci_dev_t bdf, uint offset)
{
unsigned int bus = PCI_BUS(bdf);
unsigned int dev = PCI_DEV(bdf);
unsigned int func = PCI_FUNC(bdf);
return (bus << 20) | (dev << 15) | (func << 12) | (offset & ~0x3);
}
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 = rockchip_pcie_off_conf(bdf, offset);
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 = rockchip_pcie_off_conf(bdf, offset);
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);
struct rockchip_pcie_phy *phy = pcie_get_phy(priv);
struct rockchip_pcie_phy_ops *ops = phy_get_ops(phy);
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 = ops->init(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 = ops->power_on(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);
goto err_power_off_phy;
}
return 0;
err_power_off_phy:
ops->power_off(phy);
err_exit_phy:
ops->exit(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;
}
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;
priv->dev = dev;
ret = rockchip_pcie_parse_dt(dev);
if (ret)
return ret;
ret = rockchip_pcie_phy_get(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, 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_alloc_size = sizeof(struct rockchip_pcie),
};
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