u-boot/drivers/pci/pcie_dw_mvebu.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

580 lines
17 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 Marvell International Ltd.
*
* Copyright (C) 2016 Stefan Roese <sr@denx.de>
*
* Based on:
* - drivers/pci/pcie_imx.c
* - drivers/pci/pci_mvebu.c
* - drivers/pci/pcie_xilinx.c
*/
#include <common.h>
#include <dm.h>
#include <pci.h>
#include <asm/io.h>
#include <asm-generic/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
/* PCI Config space registers */
#define PCIE_CONFIG_BAR0 0x10
#define PCIE_LINK_STATUS_REG 0x80
#define PCIE_LINK_STATUS_SPEED_OFF 16
#define PCIE_LINK_STATUS_SPEED_MASK (0xf << PCIE_LINK_STATUS_SPEED_OFF)
#define PCIE_LINK_STATUS_WIDTH_OFF 20
#define PCIE_LINK_STATUS_WIDTH_MASK (0xf << PCIE_LINK_STATUS_WIDTH_OFF)
/* Resizable bar capability registers */
#define RESIZABLE_BAR_CAP 0x250
#define RESIZABLE_BAR_CTL0 0x254
#define RESIZABLE_BAR_CTL1 0x258
/* iATU registers */
#define PCIE_ATU_VIEWPORT 0x900
#define PCIE_ATU_REGION_INBOUND (0x1 << 31)
#define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
#define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
#define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
#define PCIE_ATU_CR1 0x904
#define PCIE_ATU_TYPE_MEM (0x0 << 0)
#define PCIE_ATU_TYPE_IO (0x2 << 0)
#define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
#define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
#define PCIE_ATU_CR2 0x908
#define PCIE_ATU_ENABLE (0x1 << 31)
#define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
#define PCIE_ATU_LOWER_BASE 0x90C
#define PCIE_ATU_UPPER_BASE 0x910
#define PCIE_ATU_LIMIT 0x914
#define PCIE_ATU_LOWER_TARGET 0x918
#define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
#define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
#define PCIE_ATU_UPPER_TARGET 0x91C
#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_GEN3_RELATED 0x890
#define GEN3_EQU_DISABLE (1 << 16)
#define GEN3_ZRXDC_NON_COMP (1 << 0)
#define PCIE_GEN3_EQU_CTRL 0x8A8
#define GEN3_EQU_EVAL_2MS_DISABLE (1 << 5)
#define PCIE_ROOT_COMPLEX_MODE_MASK (0xF << 4)
#define PCIE_LINK_UP_TIMEOUT_MS 100
#define PCIE_GLOBAL_CONTROL 0x8000
#define PCIE_APP_LTSSM_EN (1 << 2)
#define PCIE_DEVICE_TYPE_OFFSET (4)
#define PCIE_DEVICE_TYPE_MASK (0xF)
#define PCIE_DEVICE_TYPE_EP (0x0) /* Endpoint */
#define PCIE_DEVICE_TYPE_LEP (0x1) /* Legacy endpoint */
#define PCIE_DEVICE_TYPE_RC (0x4) /* Root complex */
#define PCIE_GLOBAL_STATUS 0x8008
#define PCIE_GLB_STS_RDLH_LINK_UP (1 << 1)
#define PCIE_GLB_STS_PHY_LINK_UP (1 << 9)
#define PCIE_ARCACHE_TRC 0x8050
#define PCIE_AWCACHE_TRC 0x8054
#define ARCACHE_SHAREABLE_CACHEABLE 0x3511
#define AWCACHE_SHAREABLE_CACHEABLE 0x5311
#define LINK_SPEED_GEN_1 0x1
#define LINK_SPEED_GEN_2 0x2
#define LINK_SPEED_GEN_3 0x3
/**
* struct pcie_dw_mvebu - MVEBU DW PCIe controller state
*
* @ctrl_base: The base address of the register space
* @cfg_base: The base address of the configuration space
* @cfg_size: The size of the configuration space which is needed
* as it gets written into the PCIE_ATU_LIMIT register
* @first_busno: This driver supports multiple PCIe controllers.
* first_busno stores the bus number of the PCIe root-port
* number which may vary depending on the PCIe setup
* (PEX switches etc).
*/
struct pcie_dw_mvebu {
void *ctrl_base;
void *cfg_base;
fdt_size_t cfg_size;
int first_busno;
/* IO and MEM PCI regions */
struct pci_region io;
struct pci_region mem;
};
static int pcie_dw_get_link_speed(const void *regs_base)
{
return (readl(regs_base + PCIE_LINK_STATUS_REG) &
PCIE_LINK_STATUS_SPEED_MASK) >> PCIE_LINK_STATUS_SPEED_OFF;
}
static int pcie_dw_get_link_width(const void *regs_base)
{
return (readl(regs_base + PCIE_LINK_STATUS_REG) &
PCIE_LINK_STATUS_WIDTH_MASK) >> PCIE_LINK_STATUS_WIDTH_OFF;
}
/**
* pcie_dw_prog_outbound_atu() - Configure ATU for outbound accesses
*
* @pcie: Pointer to the PCI controller state
* @index: ATU region index
* @type: ATU accsess type
* @cpu_addr: the physical address for the translation entry
* @pci_addr: the pcie bus address for the translation entry
* @size: the size of the translation entry
*/
static void pcie_dw_prog_outbound_atu(struct pcie_dw_mvebu *pcie, int index,
int type, u64 cpu_addr, u64 pci_addr,
u32 size)
{
writel(PCIE_ATU_REGION_OUTBOUND | index,
pcie->ctrl_base + PCIE_ATU_VIEWPORT);
writel(lower_32_bits(cpu_addr), pcie->ctrl_base + PCIE_ATU_LOWER_BASE);
writel(upper_32_bits(cpu_addr), pcie->ctrl_base + PCIE_ATU_UPPER_BASE);
writel(lower_32_bits(cpu_addr + size - 1),
pcie->ctrl_base + PCIE_ATU_LIMIT);
writel(lower_32_bits(pci_addr),
pcie->ctrl_base + PCIE_ATU_LOWER_TARGET);
writel(upper_32_bits(pci_addr),
pcie->ctrl_base + PCIE_ATU_UPPER_TARGET);
writel(type, pcie->ctrl_base + PCIE_ATU_CR1);
writel(PCIE_ATU_ENABLE, pcie->ctrl_base + PCIE_ATU_CR2);
}
/**
* set_cfg_address() - Configure the PCIe controller config space access
*
* @pcie: Pointer to the PCI controller state
* @d: PCI device to access
* @where: Offset in the configuration space
*
* Configures the PCIe controller to access the configuration space of
* a specific PCIe device and returns the address to use for this
* access.
*
* Return: Address that can be used to access the configation space
* of the requested device / offset
*/
static uintptr_t set_cfg_address(struct pcie_dw_mvebu *pcie,
pci_dev_t d, uint where)
{
uintptr_t va_address;
u32 atu_type;
/*
* Region #0 is used for Outbound CFG space access.
* Direction = Outbound
* Region Index = 0
*/
if (PCI_BUS(d) == (pcie->first_busno + 1))
/* For local bus, change TLP Type field to 4. */
atu_type = PCIE_ATU_TYPE_CFG0;
else
/* Otherwise, change TLP Type field to 5. */
atu_type = PCIE_ATU_TYPE_CFG1;
if (PCI_BUS(d) == pcie->first_busno) {
/* Accessing root port configuration space. */
va_address = (uintptr_t)pcie->ctrl_base;
} else {
d = PCI_MASK_BUS(d) | (PCI_BUS(d) - pcie->first_busno);
pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0,
atu_type, (u64)pcie->cfg_base,
d << 8, pcie->cfg_size);
va_address = (uintptr_t)pcie->cfg_base;
}
va_address += where & ~0x3;
return va_address;
}
/**
* pcie_dw_addr_valid() - Check for valid bus address
*
* @d: The PCI device to access
* @first_busno: Bus number of the PCIe controller root complex
*
* Return 1 (true) if the PCI device can be accessed by this controller.
*
* Return: 1 on valid, 0 on invalid
*/
static int pcie_dw_addr_valid(pci_dev_t d, int first_busno)
{
if ((PCI_BUS(d) == first_busno) && (PCI_DEV(d) > 0))
return 0;
if ((PCI_BUS(d) == first_busno + 1) && (PCI_DEV(d) > 0))
return 0;
return 1;
}
/**
* pcie_dw_mvebu_read_config() - Read from configuration space
*
* @bus: Pointer to the PCI bus
* @bdf: Identifies the PCIe device to access
* @offset: The offset into the device's configuration space
* @valuep: A pointer at which to store the read value
* @size: Indicates the size of access to perform
*
* Read a value of size @size from offset @offset within the configuration
* space of the device identified by the bus, device & function numbers in @bdf
* on the PCI bus @bus.
*
* Return: 0 on success
*/
static int pcie_dw_mvebu_read_config(struct udevice *bus, pci_dev_t bdf,
uint offset, ulong *valuep,
enum pci_size_t size)
{
struct pcie_dw_mvebu *pcie = dev_get_priv(bus);
uintptr_t va_address;
ulong value;
debug("PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) {
debug("- out of range\n");
*valuep = pci_get_ff(size);
return 0;
}
va_address = set_cfg_address(pcie, bdf, offset);
value = readl(va_address);
debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value);
*valuep = pci_conv_32_to_size(value, offset, size);
pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0,
PCIE_ATU_TYPE_IO, pcie->io.phys_start,
pcie->io.bus_start, pcie->io.size);
return 0;
}
/**
* pcie_dw_mvebu_write_config() - Write to configuration space
*
* @bus: Pointer to the PCI bus
* @bdf: Identifies the PCIe device to access
* @offset: The offset into the device's configuration space
* @value: The value to write
* @size: Indicates the size of access to perform
*
* Write the value @value of size @size from offset @offset within the
* configuration space of the device identified by the bus, device & function
* numbers in @bdf on the PCI bus @bus.
*
* Return: 0 on success
*/
static int pcie_dw_mvebu_write_config(struct udevice *bus, pci_dev_t bdf,
uint offset, ulong value,
enum pci_size_t size)
{
struct pcie_dw_mvebu *pcie = dev_get_priv(bus);
uintptr_t va_address;
ulong old;
debug("PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value);
if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) {
debug("- out of range\n");
return 0;
}
va_address = set_cfg_address(pcie, bdf, offset);
old = readl(va_address);
value = pci_conv_size_to_32(old, value, offset, size);
writel(value, va_address);
pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0,
PCIE_ATU_TYPE_IO, pcie->io.phys_start,
pcie->io.bus_start, pcie->io.size);
return 0;
}
/**
* 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(const void *regs_base, u32 cap_speed)
{
/*
* TODO (shadi@marvell.com, sr@denx.de):
* Need to read the serdes speed from the dts and according to it
* configure the PCIe gen
*/
/* Set link to GEN 3 */
clrsetbits_le32(regs_base + PCIE_LINK_CTL_2,
TARGET_LINK_SPEED_MASK, cap_speed);
clrsetbits_le32(regs_base + PCIE_LINK_CAPABILITY,
TARGET_LINK_SPEED_MASK, cap_speed);
setbits_le32(regs_base + PCIE_GEN3_EQU_CTRL, GEN3_EQU_EVAL_2MS_DISABLE);
}
/**
* is_link_up() - Return the link state
*
* @regs_base: A pointer to the PCIe controller registers
*
* Return: 1 (true) for active line and 0 (false) for no link
*/
static int is_link_up(const void *regs_base)
{
u32 mask = PCIE_GLB_STS_RDLH_LINK_UP | PCIE_GLB_STS_PHY_LINK_UP;
u32 reg;
reg = readl(regs_base + PCIE_GLOBAL_STATUS);
if ((reg & mask) == mask)
return 1;
return 0;
}
/**
* 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(const void *regs_base)
{
unsigned long timeout;
timeout = get_timer(0) + PCIE_LINK_UP_TIMEOUT_MS;
while (!is_link_up(regs_base)) {
if (get_timer(0) > timeout)
return 0;
};
return 1;
}
/**
* pcie_dw_mvebu_pcie_link_up() - Configure the PCIe root port
*
* @regs_base: A pointer to the PCIe controller registers
* @cap_speed: The capabilities and speed to configure
*
* Configure the PCIe controller root complex depending on the
* requested link capabilities and speed.
*
* Return: 1 (true) for active line and 0 (false) for no link
*/
static int pcie_dw_mvebu_pcie_link_up(const void *regs_base, u32 cap_speed)
{
if (!is_link_up(regs_base)) {
/* Disable LTSSM state machine to enable configuration */
clrbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
PCIE_APP_LTSSM_EN);
}
clrsetbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
PCIE_DEVICE_TYPE_MASK << PCIE_DEVICE_TYPE_OFFSET,
PCIE_DEVICE_TYPE_RC << PCIE_DEVICE_TYPE_OFFSET);
/* Set the PCIe master AXI attributes */
writel(ARCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_ARCACHE_TRC);
writel(AWCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_AWCACHE_TRC);
/* DW pre link configurations */
pcie_dw_configure(regs_base, cap_speed);
if (!is_link_up(regs_base)) {
/* Configuration done. Start LTSSM */
setbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
PCIE_APP_LTSSM_EN);
}
/* Check that link was established */
if (!wait_link_up(regs_base))
return 0;
/*
* Link can be established in Gen 1. still need to wait
* till MAC nagaotiation is completed
*/
udelay(100);
return 1;
}
/**
* pcie_dw_set_host_bars() - Configure the host BARs
*
* @regs_base: A pointer to the PCIe controller registers
*
* Configure the host BARs of the PCIe controller root port so that
* PCI(e) devices may access the system memory.
*/
static void pcie_dw_set_host_bars(const void *regs_base)
{
u32 size = gd->ram_size;
u64 max_size;
u32 reg;
u32 bar0;
/* Verify the maximal BAR size */
reg = readl(regs_base + RESIZABLE_BAR_CAP);
max_size = 1ULL << (5 + (reg + (1 << 4)));
if (size > max_size) {
size = max_size;
printf("Warning: PCIe BARs can't map all DRAM space\n");
}
/* Set the BAR base and size towards DDR */
bar0 = CONFIG_SYS_SDRAM_BASE & ~0xf;
bar0 |= PCI_BASE_ADDRESS_MEM_TYPE_32;
writel(CONFIG_SYS_SDRAM_BASE, regs_base + PCIE_CONFIG_BAR0);
reg = ((size >> 20) - 1) << 12;
writel(size, regs_base + RESIZABLE_BAR_CTL0);
}
/**
* pcie_dw_mvebu_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_mvebu_probe(struct udevice *dev)
{
struct pcie_dw_mvebu *pcie = dev_get_priv(dev);
struct udevice *ctlr = pci_get_controller(dev);
struct pci_controller *hose = dev_get_uclass_priv(ctlr);
#ifdef CONFIG_DM_GPIO
struct gpio_desc reset_gpio;
gpio_request_by_name(dev, "marvell,reset-gpio", 0, &reset_gpio,
GPIOD_IS_OUT);
/*
* Issue reset to add-in card trough the dedicated GPIO.
* Some boards are connecting the card reset pin to common system
* reset wire and others are using separate GPIO port.
* In the last case we have to release a reset of the addon card
* using this GPIO.
*/
if (dm_gpio_is_valid(&reset_gpio)) {
dm_gpio_set_value(&reset_gpio, 1);
mdelay(200);
}
#else
debug("PCIE Reset on GPIO support is missing\n");
#endif /* CONFIG_DM_GPIO */
pcie->first_busno = dev->seq;
/* Don't register host if link is down */
if (!pcie_dw_mvebu_pcie_link_up(pcie->ctrl_base, LINK_SPEED_GEN_3)) {
printf("PCIE-%d: Link down\n", dev->seq);
} else {
printf("PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n", dev->seq,
pcie_dw_get_link_speed(pcie->ctrl_base),
pcie_dw_get_link_width(pcie->ctrl_base),
hose->first_busno);
}
/* Store the IO and MEM windows settings for future use by the ATU */
pcie->io.phys_start = hose->regions[0].phys_start; /* IO base */
pcie->io.bus_start = hose->regions[0].bus_start; /* IO_bus_addr */
pcie->io.size = hose->regions[0].size; /* IO size */
pcie->mem.phys_start = hose->regions[1].phys_start; /* MEM base */
pcie->mem.bus_start = hose->regions[1].bus_start; /* MEM_bus_addr */
pcie->mem.size = hose->regions[1].size; /* MEM size */
pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX1,
PCIE_ATU_TYPE_MEM, pcie->mem.phys_start,
pcie->mem.bus_start, pcie->mem.size);
/* Set the CLASS_REV of RC CFG header to PCI_CLASS_BRIDGE_PCI */
clrsetbits_le32(pcie->ctrl_base + PCI_CLASS_REVISION,
0xffff << 16, PCI_CLASS_BRIDGE_PCI << 16);
pcie_dw_set_host_bars(pcie->ctrl_base);
return 0;
}
/**
* pcie_dw_mvebu_ofdata_to_platdata() - 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_mvebu_ofdata_to_platdata(struct udevice *dev)
{
struct pcie_dw_mvebu *pcie = dev_get_priv(dev);
/* Get the controller base address */
pcie->ctrl_base = (void *)devfdt_get_addr_index(dev, 0);
if ((fdt_addr_t)pcie->ctrl_base == FDT_ADDR_T_NONE)
return -EINVAL;
/* Get the config space base address and size */
pcie->cfg_base = (void *)devfdt_get_addr_size_index(dev, 1,
&pcie->cfg_size);
if ((fdt_addr_t)pcie->cfg_base == FDT_ADDR_T_NONE)
return -EINVAL;
return 0;
}
static const struct dm_pci_ops pcie_dw_mvebu_ops = {
.read_config = pcie_dw_mvebu_read_config,
.write_config = pcie_dw_mvebu_write_config,
};
static const struct udevice_id pcie_dw_mvebu_ids[] = {
{ .compatible = "marvell,armada8k-pcie" },
{ }
};
U_BOOT_DRIVER(pcie_dw_mvebu) = {
.name = "pcie_dw_mvebu",
.id = UCLASS_PCI,
.of_match = pcie_dw_mvebu_ids,
.ops = &pcie_dw_mvebu_ops,
.ofdata_to_platdata = pcie_dw_mvebu_ofdata_to_platdata,
.probe = pcie_dw_mvebu_probe,
.priv_auto_alloc_size = sizeof(struct pcie_dw_mvebu),
};