u-boot/drivers/pci/pcie_dw_ti.c
Neil Armstrong 1a03182967 pci: pcie_dw_ti: migrate to common Designware PCIe functions
Migrate the dw_ti driver to use the common DW PCIe helpers.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
2021-04-15 10:43:17 +08:00

361 lines
8.3 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018 Texas Instruments, Inc
*/
#include <common.h>
#include <dm.h>
#include <log.h>
#include <pci.h>
#include <generic-phy.h>
#include <power-domain.h>
#include <regmap.h>
#include <syscon.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm-generic/gpio.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/err.h>
#include "pcie_dw_common.h"
DECLARE_GLOBAL_DATA_PTR;
#define PCIE_VENDORID_MASK GENMASK(15, 0)
#define PCIE_DEVICEID_SHIFT 16
#define PCIE_LINK_CAPABILITY 0x7c
#define PCIE_LINK_CTL_2 0xa0
#define TARGET_LINK_SPEED_MASK 0xf
#define LINK_SPEED_GEN_1 0x1
#define LINK_SPEED_GEN_2 0x2
#define LINK_SPEED_GEN_3 0x3
#define PCIE_MISC_CONTROL_1_OFF 0x8bc
#define PCIE_DBI_RO_WR_EN BIT(0)
#define PLR_OFFSET 0x700
#define PCIE_PORT_DEBUG0 (PLR_OFFSET + 0x28)
#define PORT_LOGIC_LTSSM_STATE_MASK 0x1f
#define PORT_LOGIC_LTSSM_STATE_L0 0x11
#define PCIE_LINK_UP_TIMEOUT_MS 100
/* Offsets from App base */
#define PCIE_CMD_STATUS 0x04
#define LTSSM_EN_VAL BIT(0)
#define AM654_PCIE_DEV_TYPE_MASK 0x3
#define EP 0x0
#define LEG_EP 0x1
#define RC 0x2
/**
* struct pcie_dw_ti - TI DW PCIe controller state
*
* @pci: The common PCIe DW structure
* @app_base: The base address of application register space
*/
struct pcie_dw_ti {
/* Must be first member of the struct */
struct pcie_dw dw;
void *app_base;
};
enum dw_pcie_device_mode {
DW_PCIE_UNKNOWN_TYPE,
DW_PCIE_EP_TYPE,
DW_PCIE_LEG_EP_TYPE,
DW_PCIE_RC_TYPE,
};
/**
* pcie_dw_configure() - Configure link capabilities and speed
*
* @regs_base: A pointer to the PCIe controller registers
* @cap_speed: The capabilities and speed to configure
*
* Configure the link capabilities and speed in the PCIe root complex.
*/
static void pcie_dw_configure(struct pcie_dw_ti *pci, u32 cap_speed)
{
u32 val;
dw_pcie_dbi_write_enable(&pci->dw, true);
val = readl(pci->dw.dbi_base + PCIE_LINK_CAPABILITY);
val &= ~TARGET_LINK_SPEED_MASK;
val |= cap_speed;
writel(val, pci->dw.dbi_base + PCIE_LINK_CAPABILITY);
val = readl(pci->dw.dbi_base + PCIE_LINK_CTL_2);
val &= ~TARGET_LINK_SPEED_MASK;
val |= cap_speed;
writel(val, pci->dw.dbi_base + PCIE_LINK_CTL_2);
dw_pcie_dbi_write_enable(&pci->dw, false);
}
/**
* is_link_up() - Return the link state
*
* @regs_base: A pointer to the PCIe DBICS registers
*
* Return: 1 (true) for active line and 0 (false) for no link
*/
static int is_link_up(struct pcie_dw_ti *pci)
{
u32 val;
val = readl(pci->dw.dbi_base + PCIE_PORT_DEBUG0);
val &= PORT_LOGIC_LTSSM_STATE_MASK;
return (val == PORT_LOGIC_LTSSM_STATE_L0);
}
/**
* wait_link_up() - Wait for the link to come up
*
* @regs_base: A pointer to the PCIe controller registers
*
* Return: 1 (true) for active line and 0 (false) for no link (timeout)
*/
static int wait_link_up(struct pcie_dw_ti *pci)
{
unsigned long timeout;
timeout = get_timer(0) + PCIE_LINK_UP_TIMEOUT_MS;
while (!is_link_up(pci)) {
if (get_timer(0) > timeout)
return 0;
};
return 1;
}
static int pcie_dw_ti_pcie_link_up(struct pcie_dw_ti *pci, u32 cap_speed)
{
u32 val;
if (is_link_up(pci)) {
printf("PCI Link already up before configuration!\n");
return 1;
}
/* DW pre link configurations */
pcie_dw_configure(pci, cap_speed);
/* Initiate link training */
val = readl(pci->app_base + PCIE_CMD_STATUS);
val |= LTSSM_EN_VAL;
writel(val, pci->app_base + PCIE_CMD_STATUS);
/* Check that link was established */
if (!wait_link_up(pci))
return 0;
/*
* Link can be established in Gen 1. still need to wait
* till MAC nagaotiation is completed
*/
udelay(100);
return 1;
}
static int pcie_am654_set_mode(struct pcie_dw_ti *pci,
enum dw_pcie_device_mode mode)
{
struct regmap *syscon;
u32 val;
u32 mask;
int ret;
syscon = syscon_regmap_lookup_by_phandle(pci->dw.dev,
"ti,syscon-pcie-mode");
if (IS_ERR(syscon))
return 0;
mask = AM654_PCIE_DEV_TYPE_MASK;
switch (mode) {
case DW_PCIE_RC_TYPE:
val = RC;
break;
case DW_PCIE_EP_TYPE:
val = EP;
break;
default:
dev_err(pci->dw.dev, "INVALID device type %d\n", mode);
return -EINVAL;
}
ret = regmap_update_bits(syscon, 0, mask, val);
if (ret) {
dev_err(pci->dw.dev, "failed to set pcie mode\n");
return ret;
}
return 0;
}
static int pcie_dw_init_id(struct pcie_dw_ti *pci)
{
struct regmap *devctrl_regs;
unsigned int id;
int ret;
devctrl_regs = syscon_regmap_lookup_by_phandle(pci->dw.dev,
"ti,syscon-pcie-id");
if (IS_ERR(devctrl_regs))
return PTR_ERR(devctrl_regs);
ret = regmap_read(devctrl_regs, 0, &id);
if (ret)
return ret;
dw_pcie_dbi_write_enable(&pci->dw, true);
writew(id & PCIE_VENDORID_MASK, pci->dw.dbi_base + PCI_VENDOR_ID);
writew(id >> PCIE_DEVICEID_SHIFT, pci->dw.dbi_base + PCI_DEVICE_ID);
dw_pcie_dbi_write_enable(&pci->dw, false);
return 0;
}
/**
* pcie_dw_ti_probe() - Probe the PCIe bus for active link
*
* @dev: A pointer to the device being operated on
*
* Probe for an active link on the PCIe bus and configure the controller
* to enable this port.
*
* Return: 0 on success, else -ENODEV
*/
static int pcie_dw_ti_probe(struct udevice *dev)
{
struct pcie_dw_ti *pci = dev_get_priv(dev);
struct udevice *ctlr = pci_get_controller(dev);
struct pci_controller *hose = dev_get_uclass_priv(ctlr);
struct power_domain pci_pwrdmn;
struct phy phy0, phy1;
int ret;
ret = power_domain_get_by_index(dev, &pci_pwrdmn, 0);
if (ret) {
dev_err(dev, "failed to get power domain\n");
return ret;
}
ret = power_domain_on(&pci_pwrdmn);
if (ret) {
dev_err(dev, "Power domain on failed\n");
return ret;
}
ret = generic_phy_get_by_name(dev, "pcie-phy0", &phy0);
if (ret) {
dev_err(dev, "Unable to get phy0");
return ret;
}
generic_phy_reset(&phy0);
generic_phy_init(&phy0);
generic_phy_power_on(&phy0);
ret = generic_phy_get_by_name(dev, "pcie-phy1", &phy1);
if (ret) {
dev_err(dev, "Unable to get phy1");
return ret;
}
generic_phy_reset(&phy1);
generic_phy_init(&phy1);
generic_phy_power_on(&phy1);
pci->dw.first_busno = dev_seq(dev);
pci->dw.dev = dev;
pcie_dw_setup_host(&pci->dw);
pcie_dw_init_id(pci);
if (device_is_compatible(dev, "ti,am654-pcie-rc"))
pcie_am654_set_mode(pci, DW_PCIE_RC_TYPE);
if (!pcie_dw_ti_pcie_link_up(pci, LINK_SPEED_GEN_2)) {
printf("PCIE-%d: Link down\n", dev_seq(dev));
return -ENODEV;
}
printf("PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n", dev_seq(dev),
pcie_dw_get_link_speed(&pci->dw),
pcie_dw_get_link_width(&pci->dw),
hose->first_busno);
pcie_dw_prog_outbound_atu_unroll(&pci->dw, PCIE_ATU_REGION_INDEX0,
PCIE_ATU_TYPE_MEM,
pci->dw.mem.phys_start,
pci->dw.mem.bus_start, pci->dw.mem.size);
return 0;
}
/**
* pcie_dw_ti_of_to_plat() - Translate from DT to device state
*
* @dev: A pointer to the device being operated on
*
* Translate relevant data from the device tree pertaining to device @dev into
* state that the driver will later make use of. This state is stored in the
* device's private data structure.
*
* Return: 0 on success, else -EINVAL
*/
static int pcie_dw_ti_of_to_plat(struct udevice *dev)
{
struct pcie_dw_ti *pcie = dev_get_priv(dev);
/* Get the controller base address */
pcie->dw.dbi_base = (void *)dev_read_addr_name(dev, "dbics");
if ((fdt_addr_t)pcie->dw.dbi_base == FDT_ADDR_T_NONE)
return -EINVAL;
/* Get the config space base address and size */
pcie->dw.cfg_base = (void *)dev_read_addr_size_name(dev, "config",
&pcie->dw.cfg_size);
if ((fdt_addr_t)pcie->dw.cfg_base == FDT_ADDR_T_NONE)
return -EINVAL;
/* Get the iATU base address and size */
pcie->dw.atu_base = (void *)dev_read_addr_name(dev, "atu");
if ((fdt_addr_t)pcie->dw.atu_base == FDT_ADDR_T_NONE)
return -EINVAL;
/* Get the app base address and size */
pcie->app_base = (void *)dev_read_addr_name(dev, "app");
if ((fdt_addr_t)pcie->app_base == FDT_ADDR_T_NONE)
return -EINVAL;
return 0;
}
static const struct dm_pci_ops pcie_dw_ti_ops = {
.read_config = pcie_dw_read_config,
.write_config = pcie_dw_write_config,
};
static const struct udevice_id pcie_dw_ti_ids[] = {
{ .compatible = "ti,am654-pcie-rc" },
{ }
};
U_BOOT_DRIVER(pcie_dw_ti) = {
.name = "pcie_dw_ti",
.id = UCLASS_PCI,
.of_match = pcie_dw_ti_ids,
.ops = &pcie_dw_ti_ops,
.of_to_plat = pcie_dw_ti_of_to_plat,
.probe = pcie_dw_ti_probe,
.priv_auto = sizeof(struct pcie_dw_ti),
};