[PATCH RFT v2 1/4] pci: add common Designware PCIe functions
Neil Armstrong
narmstrong at baylibre.com
Thu Mar 25 15:49:18 CET 2021
With the introduction of pcie_dw_rockchip, and need to support the DW PCIe in the
Amlogic AXG & G12 SoCs, most of the DW PCIe helpers would be duplicated.
This introduce a "common" DW PCIe helpers file with common code merged from the
dw_ti and dw_rockchip drivers and adapted to fit with the upcoming dw_meson.
The following changes will switch the dw_ti and dw_rockchip to use these helpers.
Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
---
drivers/pci/Kconfig | 4 +
drivers/pci/Makefile | 1 +
drivers/pci/pcie_dw_common.c | 366 +++++++++++++++++++++++++++++++++++
drivers/pci/pcie_dw_common.h | 155 +++++++++++++++
4 files changed, 526 insertions(+)
create mode 100644 drivers/pci/pcie_dw_common.c
create mode 100644 drivers/pci/pcie_dw_common.h
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index ba41787f64..ab5a5e7ed6 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -258,6 +258,10 @@ config PCI_MVEBU
Say Y here if you want to enable PCIe controller support on
Armada XP/38x SoCs.
+config PCIE_DW_COMMON
+ bool
+ select DM_PCI
+
config PCI_KEYSTONE
bool "TI Keystone PCIe controller"
depends on DM_PCI
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 5ed94bc95c..e3ca8b27e4 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_PCIE_LAYERSCAPE_GEN4) += pcie_layerscape_gen4.o \
obj-$(CONFIG_PCI_XILINX) += pcie_xilinx.o
obj-$(CONFIG_PCI_PHYTIUM) += pcie_phytium.o
obj-$(CONFIG_PCIE_INTEL_FPGA) += pcie_intel_fpga.o
+obj-$(CONFIG_PCIE_DW_COMMON) += pcie_dw_common.o
obj-$(CONFIG_PCI_KEYSTONE) += pcie_dw_ti.o
obj-$(CONFIG_PCIE_MEDIATEK) += pcie_mediatek.o
obj-$(CONFIG_PCIE_ROCKCHIP) += pcie_rockchip.o
diff --git a/drivers/pci/pcie_dw_common.c b/drivers/pci/pcie_dw_common.c
new file mode 100644
index 0000000000..7c92b7b754
--- /dev/null
+++ b/drivers/pci/pcie_dw_common.c
@@ -0,0 +1,366 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2021 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong at baylibre.com>
+ *
+ * Copyright (c) 2021 Rockchip, Inc.
+ *
+ * Copyright (C) 2018 Texas Instruments, Inc
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <log.h>
+#include <pci.h>
+#include <dm/device_compat.h>
+#include <asm/io.h>
+#include <linux/delay.h>
+#include "pcie_dw_common.h"
+
+int pcie_dw_get_link_speed(struct pcie_dw *pci)
+{
+ return (readl(pci->dbi_base + PCIE_LINK_STATUS_REG) &
+ PCIE_LINK_STATUS_SPEED_MASK) >> PCIE_LINK_STATUS_SPEED_OFF;
+}
+
+int pcie_dw_get_link_width(struct pcie_dw *pci)
+{
+ return (readl(pci->dbi_base + PCIE_LINK_STATUS_REG) &
+ PCIE_LINK_STATUS_WIDTH_MASK) >> PCIE_LINK_STATUS_WIDTH_OFF;
+}
+
+static void dw_pcie_writel_ob_unroll(struct pcie_dw *pci, u32 index, u32 reg,
+ u32 val)
+{
+ u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
+ void __iomem *base = pci->atu_base;
+
+ writel(val, base + offset + reg);
+}
+
+static u32 dw_pcie_readl_ob_unroll(struct pcie_dw *pci, u32 index, u32 reg)
+{
+ u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
+ void __iomem *base = pci->atu_base;
+
+ return readl(base + offset + reg);
+}
+
+/**
+ * pcie_dw_prog_outbound_atu_unroll() - 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
+ *
+ * Return: 0 is successful and -1 is failure
+ */
+int pcie_dw_prog_outbound_atu_unroll(struct pcie_dw *pci, int index,
+ int type, u64 cpu_addr,
+ u64 pci_addr, u32 size)
+{
+ u32 retries, val;
+
+ dev_dbg(pci->dev, "ATU programmed with: index: %d, type: %d, cpu addr: %8llx, pci addr: %8llx, size: %8x\n",
+ index, type, cpu_addr, pci_addr, size);
+
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_BASE,
+ lower_32_bits(cpu_addr));
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_BASE,
+ upper_32_bits(cpu_addr));
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LIMIT,
+ lower_32_bits(cpu_addr + size - 1));
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
+ lower_32_bits(pci_addr));
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
+ upper_32_bits(pci_addr));
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
+ type);
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_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_ob_unroll(pci, index,
+ PCIE_ATU_UNR_REGION_CTRL2);
+ if (val & PCIE_ATU_ENABLE)
+ return 0;
+
+ udelay(LINK_WAIT_IATU);
+ }
+ dev_err(pci->dev, "outbound iATU is not being enabled\n");
+
+ return -1;
+}
+
+/**
+ * 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 *pcie,
+ pci_dev_t d, uint where)
+{
+ int bus = PCI_BUS(d) - pcie->first_busno;
+ uintptr_t va_address;
+ u32 atu_type;
+ int ret;
+
+ /* Use dbi_base for own configuration read and write */
+ if (!bus) {
+ va_address = (uintptr_t)pcie->dbi_base;
+ goto out;
+ }
+
+ if (bus == 1)
+ /*
+ * For local bus whose primary bus number is root bridge,
+ * 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;
+
+ /*
+ * Not accessing root port configuration space?
+ * Region #0 is used for Outbound CFG space access.
+ * Direction = Outbound
+ * Region Index = 0
+ */
+ d = PCI_MASK_BUS(d);
+ d = PCI_ADD_BUS(bus, d);
+ ret = pcie_dw_prog_outbound_atu_unroll(pcie, PCIE_ATU_REGION_INDEX1,
+ atu_type, (u64)pcie->cfg_base,
+ d << 8, pcie->cfg_size);
+ if (ret)
+ return (uintptr_t)ret;
+
+ va_address = (uintptr_t)pcie->cfg_base;
+
+out:
+ 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_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
+ */
+int pcie_dw_read_config(const struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong *valuep,
+ enum pci_size_t size)
+{
+ struct pcie_dw *pcie = dev_get_priv(bus);
+ uintptr_t va_address;
+ ulong value;
+
+ dev_dbg(pcie->dev, "PCIE CFG read: bdf=%2x:%2x:%2x ",
+ 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);
+
+ return pcie_dw_prog_outbound_atu_unroll(pcie, PCIE_ATU_REGION_INDEX1,
+ PCIE_ATU_TYPE_IO, pcie->io.phys_start,
+ pcie->io.bus_start, pcie->io.size);
+}
+
+/**
+ * pcie_dw_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
+ */
+int pcie_dw_write_config(struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong value,
+ enum pci_size_t size)
+{
+ struct pcie_dw *pcie = dev_get_priv(bus);
+ uintptr_t va_address;
+ ulong old;
+
+ dev_dbg(pcie->dev, "PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
+ dev_dbg(pcie->dev, "(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);
+
+ return pcie_dw_prog_outbound_atu_unroll(pcie, PCIE_ATU_REGION_INDEX1,
+ PCIE_ATU_TYPE_IO, pcie->io.phys_start,
+ pcie->io.bus_start, pcie->io.size);
+}
+
+/**
+ * pcie_dw_setup_host() - Setup the PCIe controller for RC opertaion
+ *
+ * @pcie: Pointer to the PCI controller state
+ *
+ * Configure the host BARs of the PCIe controller root port so that
+ * PCI(e) devices may access the system memory.
+ */
+void pcie_dw_setup_host(struct pcie_dw *pci)
+{
+ struct udevice *ctlr = pci_get_controller(pci->dev);
+ struct pci_controller *hose = dev_get_uclass_priv(ctlr);
+ u32 ret;
+
+ if (!pci->atu_base)
+ pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
+
+ /* setup RC BARs */
+ writel(PCI_BASE_ADDRESS_MEM_TYPE_64,
+ pci->dbi_base + PCI_BASE_ADDRESS_0);
+ writel(0x0, pci->dbi_base + PCI_BASE_ADDRESS_1);
+
+ /* setup interrupt pins */
+ clrsetbits_le32(pci->dbi_base + PCI_INTERRUPT_LINE,
+ 0xff00, 0x100);
+
+ /* setup bus numbers */
+ clrsetbits_le32(pci->dbi_base + PCI_PRIMARY_BUS,
+ 0xffffff, 0x00ff0100);
+
+ /* setup command register */
+ clrsetbits_le32(pci->dbi_base + PCI_PRIMARY_BUS,
+ 0xffff,
+ PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
+ PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
+
+ /* Enable write permission for the DBI read-only register */
+ dw_pcie_dbi_write_enable(pci, true);
+ /* program correct class for RC */
+ writew(PCI_CLASS_BRIDGE_PCI, pci->dbi_base + PCI_CLASS_DEVICE);
+ /* Better disable write permission right after the update */
+ dw_pcie_dbi_write_enable(pci, false);
+
+ setbits_le32(pci->dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL,
+ PORT_LOGIC_SPEED_CHANGE);
+
+ for (ret = 0; ret < hose->region_count; ret++) {
+ if (hose->regions[ret].flags == PCI_REGION_IO) {
+ pci->io.phys_start = hose->regions[ret].phys_start; /* IO base */
+ pci->io.bus_start = hose->regions[ret].bus_start; /* IO_bus_addr */
+ pci->io.size = hose->regions[ret].size; /* IO size */
+ } else if (hose->regions[ret].flags == PCI_REGION_MEM) {
+ pci->mem.phys_start = hose->regions[ret].phys_start; /* MEM base */
+ pci->mem.bus_start = hose->regions[ret].bus_start; /* MEM_bus_addr */
+ pci->mem.size = hose->regions[ret].size; /* MEM size */
+ } else if (hose->regions[ret].flags == PCI_REGION_PREFETCH) {
+ pci->prefetch.phys_start = hose->regions[ret].phys_start; /* PREFETCH base */
+ pci->prefetch.bus_start = hose->regions[ret].bus_start; /* PREFETCH_bus_addr */
+ pci->prefetch.size = hose->regions[ret].size; /* PREFETCH size */
+ } else if (hose->regions[ret].flags == PCI_REGION_SYS_MEMORY) {
+ pci->cfg_base = (void *)(pci->io.phys_start - pci->io.size);
+ pci->cfg_size = pci->io.size;
+ } else {
+ dev_err(pci->dev, "invalid flags type!\n");
+ }
+ }
+
+ dev_dbg(pci->dev, "Config space: [0x%p - 0x%p, size 0x%llx]\n",
+ pci->cfg_base, pci->cfg_base + pci->cfg_size,
+ pci->cfg_size);
+
+ dev_dbg(pci->dev, "IO space: [0x%llx - 0x%llx, size 0x%lx]\n",
+ pci->io.phys_start, pci->io.phys_start + pci->io.size,
+ pci->io.size);
+
+ dev_dbg(pci->dev, "IO bus: [0x%lx - 0x%lx, size 0x%lx]\n",
+ pci->io.bus_start, pci->io.bus_start + pci->io.size,
+ pci->io.size);
+
+ dev_dbg(pci->dev, "MEM space: [0x%llx - 0x%llx, size 0x%lx]\n",
+ pci->mem.phys_start, pci->mem.phys_start + pci->mem.size,
+ pci->mem.size);
+
+ dev_dbg(pci->dev, "MEM bus: [0x%lx - 0x%lx, size 0x%lx]\n",
+ pci->mem.bus_start, pci->mem.bus_start + pci->mem.size,
+ pci->mem.size);
+
+ if (pci->prefetch.size) {
+ dev_dbg(pci->dev, "PREFETCH space: [0x%llx - 0x%llx, size 0x%lx]\n",
+ pci->prefetch.phys_start, pci->prefetch.phys_start + pci->prefetch.size,
+ pci->prefetch.size);
+
+ dev_dbg(pci->dev, "PREFETCH bus: [0x%lx - 0x%lx, size 0x%lx]\n",
+ pci->prefetch.bus_start, pci->prefetch.bus_start + pci->prefetch.size,
+ pci->prefetch.size);
+ }
+}
+
diff --git a/drivers/pci/pcie_dw_common.h b/drivers/pci/pcie_dw_common.h
new file mode 100644
index 0000000000..6b701645af
--- /dev/null
+++ b/drivers/pci/pcie_dw_common.h
@@ -0,0 +1,155 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2021 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong at baylibre.com>
+ *
+ * Copyright (c) 2021 Rockchip, Inc.
+ *
+ * Copyright (C) 2018 Texas Instruments, Inc
+ */
+
+#ifndef PCIE_DW_COMMON_H
+#define PCIE_DW_COMMON_H
+
+#define DEFAULT_DBI_ATU_OFFSET (0x3 << 20)
+
+/* PCI DBICS registers */
+#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)
+
+/*
+ * iATU Unroll-specific register definitions
+ * From 4.80 core version the address translation will be made by unroll.
+ * The registers are offset from atu_base
+ */
+#define PCIE_ATU_UNR_REGION_CTRL1 0x00
+#define PCIE_ATU_UNR_REGION_CTRL2 0x04
+#define PCIE_ATU_UNR_LOWER_BASE 0x08
+#define PCIE_ATU_UNR_UPPER_BASE 0x0c
+#define PCIE_ATU_UNR_LIMIT 0x10
+#define PCIE_ATU_UNR_LOWER_TARGET 0x14
+#define PCIE_ATU_UNR_UPPER_TARGET 0x18
+
+#define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
+#define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
+#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_ENABLE (0x1 << 31)
+#define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
+#define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
+#define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
+#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
+
+/* Register address builder */
+#define PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(region) ((region) << 9)
+
+/* Parameters for the waiting for iATU enabled routine */
+#define LINK_WAIT_MAX_IATU_RETRIES 5
+#define LINK_WAIT_IATU_US 10000
+
+/* PCI DBICS registers */
+#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)
+
+#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
+
+/* Synopsys-specific PCIe configuration registers */
+#define PCIE_PORT_LINK_CONTROL 0x710
+#define PORT_LINK_DLL_LINK_EN BIT(5)
+#define PORT_LINK_FAST_LINK_MODE BIT(7)
+#define PORT_LINK_MODE_MASK GENMASK(21, 16)
+#define PORT_LINK_MODE(n) FIELD_PREP(PORT_LINK_MODE_MASK, n)
+#define PORT_LINK_MODE_1_LANES PORT_LINK_MODE(0x1)
+#define PORT_LINK_MODE_2_LANES PORT_LINK_MODE(0x3)
+#define PORT_LINK_MODE_4_LANES PORT_LINK_MODE(0x7)
+#define PORT_LINK_MODE_8_LANES PORT_LINK_MODE(0xf)
+
+#define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
+#define PORT_LOGIC_N_FTS_MASK GENMASK(7, 0)
+#define PORT_LOGIC_SPEED_CHANGE BIT(17)
+#define PORT_LOGIC_LINK_WIDTH_MASK GENMASK(12, 8)
+#define PORT_LOGIC_LINK_WIDTH(n) FIELD_PREP(PORT_LOGIC_LINK_WIDTH_MASK, n)
+#define PORT_LOGIC_LINK_WIDTH_1_LANES PORT_LOGIC_LINK_WIDTH(0x1)
+#define PORT_LOGIC_LINK_WIDTH_2_LANES PORT_LOGIC_LINK_WIDTH(0x2)
+#define PORT_LOGIC_LINK_WIDTH_4_LANES PORT_LOGIC_LINK_WIDTH(0x4)
+#define PORT_LOGIC_LINK_WIDTH_8_LANES PORT_LOGIC_LINK_WIDTH(0x8)
+
+#define PCIE_MISC_CONTROL_1_OFF 0x8bc
+#define PCIE_DBI_RO_WR_EN BIT(0)
+
+/* Parameters for the waiting for iATU enabled routine */
+#define LINK_WAIT_MAX_IATU_RETRIES 5
+#define LINK_WAIT_IATU 10000
+
+/**
+ * struct pcie_dw - DW PCIe controller state
+ *
+ * @dbi_base: The base address of dbi register space
+ * @cfg_base: The base address of configuration space
+ * @atu_base: The base address of ATU 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).
+ * @io: The IO space for EP's BAR
+ * @mem: The memory space for EP's BAR
+ * @prefetch: The prefetch space for EP's BAR
+ */
+struct pcie_dw {
+ struct udevice *dev;
+ void __iomem *dbi_base;
+ void __iomem *cfg_base;
+ void __iomem *atu_base;
+ fdt_size_t cfg_size;
+
+ int first_busno;
+
+ /* IO, MEM & PREFETCH PCI regions */
+ struct pci_region io;
+ struct pci_region mem;
+ struct pci_region prefetch;
+};
+
+int pcie_dw_get_link_speed(struct pcie_dw *pci);
+
+int pcie_dw_get_link_width(struct pcie_dw *pci);
+
+int pcie_dw_prog_outbound_atu_unroll(struct pcie_dw *pci, int index, int type, u64 cpu_addr,
+ u64 pci_addr, u32 size);
+
+int pcie_dw_read_config(const struct udevice *bus, pci_dev_t bdf, uint offset, ulong *valuep,
+ enum pci_size_t size);
+
+int pcie_dw_write_config(struct udevice *bus, pci_dev_t bdf, uint offset, ulong value,
+ enum pci_size_t size);
+
+static inline void dw_pcie_dbi_write_enable(struct pcie_dw *pci, bool en)
+{
+ u32 val;
+
+ val = readl(pci->dbi_base + PCIE_MISC_CONTROL_1_OFF);
+ if (en)
+ val |= PCIE_DBI_RO_WR_EN;
+ else
+ val &= ~PCIE_DBI_RO_WR_EN;
+ writel(val, pci->dbi_base + PCIE_MISC_CONTROL_1_OFF);
+}
+
+void pcie_dw_setup_host(struct pcie_dw *pci);
+
+#endif
--
2.25.1
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