--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Rockchip DesignWare based PCIe host controller driver
+ *
+ * Copyright (c) 2021 Rockchip, Inc.
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <generic-phy.h>
+#include <pci.h>
+#include <power-domain.h>
+#include <reset.h>
+#include <syscon.h>
+#include <asm/arch-rockchip/clock.h>
+#include <asm/io.h>
+#include <asm-generic/gpio.h>
+#include <dm/device_compat.h>
+#include <linux/iopoll.h>
+#include <linux/delay.h>
+#include <power/regulator.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * struct rk_pcie - RK DW PCIe controller state
+ *
+ * @vpcie3v3: The 3.3v power supply for slot
+ * @dbi_base: The base address of dwc core regs
+ * @apb_base: The base address of vendor regs
+ * @cfg_base: The base address of config header 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).
+ * @rst_gpio: The #PERST signal for slot
+ * @io: The IO space for EP's BAR
+ * @mem: The memory space for EP's BAR
+ */
+struct rk_pcie {
+ struct udevice *dev;
+ struct udevice *vpcie3v3;
+ void *dbi_base;
+ void *apb_base;
+ void *cfg_base;
+ fdt_size_t cfg_size;
+ struct phy phy;
+ struct clk_bulk clks;
+ int first_busno;
+ struct reset_ctl_bulk rsts;
+ struct gpio_desc rst_gpio;
+ struct pci_region io;
+ struct pci_region mem;
+};
+
+/* Parameters for the waiting for iATU enabled routine */
+#define PCIE_CLIENT_GENERAL_DEBUG 0x104
+#define PCIE_CLIENT_HOT_RESET_CTRL 0x180
+#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4)
+#define PCIE_CLIENT_LTSSM_STATUS 0x300
+#define SMLH_LINKUP BIT(16)
+#define RDLH_LINKUP BIT(17)
+#define PCIE_CLIENT_DBG_FIFO_MODE_CON 0x310
+#define PCIE_CLIENT_DBG_FIFO_PTN_HIT_D0 0x320
+#define PCIE_CLIENT_DBG_FIFO_PTN_HIT_D1 0x324
+#define PCIE_CLIENT_DBG_FIFO_TRN_HIT_D0 0x328
+#define PCIE_CLIENT_DBG_FIFO_TRN_HIT_D1 0x32c
+#define PCIE_CLIENT_DBG_FIFO_STATUS 0x350
+#define PCIE_CLIENT_DBG_TRANSITION_DATA 0xffff0000
+#define PCIE_CLIENT_DBF_EN 0xffff0003
+
+/* 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
+
+#define PCIE_MISC_CONTROL_1_OFF 0x8bc
+#define PCIE_DBI_RO_WR_EN BIT(0)
+
+#define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80c
+#define PORT_LOGIC_SPEED_CHANGE BIT(17)
+
+/*
+ * 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) \
+ ((0x3 << 20) | ((region) << 9))
+
+/* Parameters for the waiting for iATU enabled routine */
+#define LINK_WAIT_MAX_IATU_RETRIES 5
+#define LINK_WAIT_IATU_US 10000
+
+/* Parameters for the waiting for #perst signal */
+#define PERST_WAIT_MS 1000
+
+static int rk_pcie_read(void __iomem *addr, int size, u32 *val)
+{
+ if ((uintptr_t)addr & (size - 1)) {
+ *val = 0;
+ return PCIBIOS_UNSUPPORTED;
+ }
+
+ if (size == 4) {
+ *val = readl(addr);
+ } else if (size == 2) {
+ *val = readw(addr);
+ } else if (size == 1) {
+ *val = readb(addr);
+ } else {
+ *val = 0;
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int rk_pcie_write(void __iomem *addr, int size, u32 val)
+{
+ if ((uintptr_t)addr & (size - 1))
+ return PCIBIOS_UNSUPPORTED;
+
+ if (size == 4)
+ writel(val, addr);
+ else if (size == 2)
+ writew(val, addr);
+ else if (size == 1)
+ writeb(val, addr);
+ else
+ return -ENODEV;
+
+ return 0;
+}
+
+static u32 __rk_pcie_read_apb(struct rk_pcie *rk_pcie, void __iomem *base,
+ u32 reg, size_t size)
+{
+ int ret;
+ u32 val;
+
+ ret = rk_pcie_read(base + reg, size, &val);
+ if (ret)
+ dev_err(rk_pcie->dev, "Read APB address failed\n");
+
+ return val;
+}
+
+static void __rk_pcie_write_apb(struct rk_pcie *rk_pcie, void __iomem *base,
+ u32 reg, size_t size, u32 val)
+{
+ int ret;
+
+ ret = rk_pcie_write(base + reg, size, val);
+ if (ret)
+ dev_err(rk_pcie->dev, "Write APB address failed\n");
+}
+
+/**
+ * rk_pcie_readl_apb() - Read vendor regs
+ *
+ * @rk_pcie: Pointer to the PCI controller state
+ * @reg: Offset of regs
+ */
+static inline u32 rk_pcie_readl_apb(struct rk_pcie *rk_pcie, u32 reg)
+{
+ return __rk_pcie_read_apb(rk_pcie, rk_pcie->apb_base, reg, 0x4);
+}
+
+/**
+ * rk_pcie_writel_apb() - Write vendor regs
+ *
+ * @rk_pcie: Pointer to the PCI controller state
+ * @reg: Offset of regs
+ * @val: Value to be writen
+ */
+static inline void rk_pcie_writel_apb(struct rk_pcie *rk_pcie, u32 reg,
+ u32 val)
+{
+ __rk_pcie_write_apb(rk_pcie, rk_pcie->apb_base, reg, 0x4, val);
+}
+
+static int rk_pcie_get_link_speed(struct rk_pcie *rk_pcie)
+{
+ return (readl(rk_pcie->dbi_base + PCIE_LINK_STATUS_REG) &
+ PCIE_LINK_STATUS_SPEED_MASK) >> PCIE_LINK_STATUS_SPEED_OFF;
+}
+
+static int rk_pcie_get_link_width(struct rk_pcie *rk_pcie)
+{
+ return (readl(rk_pcie->dbi_base + PCIE_LINK_STATUS_REG) &
+ PCIE_LINK_STATUS_WIDTH_MASK) >> PCIE_LINK_STATUS_WIDTH_OFF;
+}
+
+static void rk_pcie_writel_ob_unroll(struct rk_pcie *rk_pcie, u32 index,
+ u32 reg, u32 val)
+{
+ u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
+ void __iomem *base = rk_pcie->dbi_base;
+
+ writel(val, base + offset + reg);
+}
+
+static u32 rk_pcie_readl_ob_unroll(struct rk_pcie *rk_pcie, u32 index, u32 reg)
+{
+ u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
+ void __iomem *base = rk_pcie->dbi_base;
+
+ return readl(base + offset + reg);
+}
+
+static inline void rk_pcie_dbi_write_enable(struct rk_pcie *rk_pcie, bool en)
+{
+ u32 val;
+
+ val = readl(rk_pcie->dbi_base + PCIE_MISC_CONTROL_1_OFF);
+
+ if (en)
+ val |= PCIE_DBI_RO_WR_EN;
+ else
+ val &= ~PCIE_DBI_RO_WR_EN;
+ writel(val, rk_pcie->dbi_base + PCIE_MISC_CONTROL_1_OFF);
+}
+
+/**
+ * rockchip_pcie_setup_host() - Setup the PCIe controller for RC opertaion
+ *
+ * @rk_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.
+ */
+static void rk_pcie_setup_host(struct rk_pcie *rk_pcie)
+{
+ u32 val;
+
+ rk_pcie_dbi_write_enable(rk_pcie, true);
+
+ /* setup RC BARs */
+ writel(PCI_BASE_ADDRESS_MEM_TYPE_64,
+ rk_pcie->dbi_base + PCI_BASE_ADDRESS_0);
+ writel(0x0, rk_pcie->dbi_base + PCI_BASE_ADDRESS_1);
+
+ /* setup interrupt pins */
+ clrsetbits_le32(rk_pcie->dbi_base + PCI_INTERRUPT_LINE,
+ 0xff00, 0x100);
+
+ /* setup bus numbers */
+ clrsetbits_le32(rk_pcie->dbi_base + PCI_PRIMARY_BUS,
+ 0xffffff, 0x00ff0100);
+
+ /* setup command register */
+ clrsetbits_le32(rk_pcie->dbi_base + PCI_PRIMARY_BUS,
+ 0xffff,
+ PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
+ PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
+
+ /* program correct class for RC */
+ writew(PCI_CLASS_BRIDGE_PCI, rk_pcie->dbi_base + PCI_CLASS_DEVICE);
+ /* Better disable write permission right after the update */
+
+ setbits_le32(rk_pcie->dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL,
+ PORT_LOGIC_SPEED_CHANGE)
+
+ rk_pcie_dbi_write_enable(rk_pcie, false);
+}
+
+/**
+ * rk_pcie_configure() - Configure link capabilities and speed
+ *
+ * @rk_pcie: Pointer to the PCI controller state
+ * @cap_speed: The capabilities and speed to configure
+ *
+ * Configure the link capabilities and speed in the PCIe root complex.
+ */
+static void rk_pcie_configure(struct rk_pcie *pci, u32 cap_speed)
+{
+ u32 val;
+
+ rk_pcie_dbi_write_enable(pci, true);
+
+ clrsetbits_le32(pci->dbi_base + PCIE_LINK_CAPABILITY,
+ TARGET_LINK_SPEED_MASK, cap_speed);
+
+ clrsetbits_le32(pci->dbi_base + PCIE_LINK_CTL_2,
+ TARGET_LINK_SPEED_MASK, cap_speed);
+
+ rk_pcie_dbi_write_enable(pci, false);
+}
+
+/**
+ * rk_pcie_dw_prog_outbound_atu_unroll() - Configure ATU for outbound accesses
+ *
+ * @rk_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
+ */
+static int rk_pcie_prog_outbound_atu_unroll(struct rk_pcie *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);
+
+ rk_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_BASE,
+ lower_32_bits(cpu_addr));
+ rk_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_BASE,
+ upper_32_bits(cpu_addr));
+ rk_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LIMIT,
+ lower_32_bits(cpu_addr + size - 1));
+ rk_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
+ lower_32_bits(pci_addr));
+ rk_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
+ upper_32_bits(pci_addr));
+ rk_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
+ type);
+ rk_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 = rk_pcie_readl_ob_unroll(pci, index,
+ PCIE_ATU_UNR_REGION_CTRL2);
+ if (val & PCIE_ATU_ENABLE)
+ return 0;
+
+ udelay(LINK_WAIT_IATU_US);
+ }
+ dev_err(pci->dev, "outbound iATU is not being enabled\n");
+
+ return -1;
+}
+
+/**
+ * rk_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 rk_pcie_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;
+}
+
+/**
+ * set_cfg_address() - Configure the PCIe controller config space access
+ *
+ * @rk_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 rk_pcie *pcie,
+ pci_dev_t d, uint where)
+{
+ int rel_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 (!rel_bus) {
+ va_address = (uintptr_t)pcie->dbi_base;
+ goto out;
+ }
+
+ if (rel_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(rel_bus, d);
+ ret = rk_pcie_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;
+}
+
+/**
+ * rockchip_pcie_rd_conf() - 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 rockchip_pcie_rd_conf(const struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong *valuep,
+ enum pci_size_t size)
+{
+ struct rk_pcie *pcie = dev_get_priv(bus);
+ uintptr_t va_address;
+ ulong value;
+
+ debug("PCIE CFG read: bdf=%2x:%2x:%2x\n",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
+
+ if (!rk_pcie_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 rk_pcie_prog_outbound_atu_unroll(pcie,
+ PCIE_ATU_REGION_INDEX1,
+ PCIE_ATU_TYPE_IO,
+ pcie->io.phys_start,
+ pcie->io.bus_start,
+ pcie->io.size);
+}
+
+/**
+ * rockchip_pcie_wr_conf() - 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 rockchip_pcie_wr_conf(struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong value,
+ enum pci_size_t size)
+{
+ struct rk_pcie *pcie = dev_get_priv(bus);
+ uintptr_t va_address;
+ ulong old;
+
+ debug("PCIE CFG write: (b,d,f)=(%2d,%2d,%2d)\n",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
+ debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value);
+
+ if (!rk_pcie_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 rk_pcie_prog_outbound_atu_unroll(pcie,
+ PCIE_ATU_REGION_INDEX1,
+ PCIE_ATU_TYPE_IO,
+ pcie->io.phys_start,
+ pcie->io.bus_start,
+ pcie->io.size);
+
+}
+
+static void rk_pcie_enable_debug(struct rk_pcie *rk_pcie)
+{
+ rk_pcie_writel_apb(rk_pcie, PCIE_CLIENT_DBG_FIFO_PTN_HIT_D0,
+ PCIE_CLIENT_DBG_TRANSITION_DATA);
+ rk_pcie_writel_apb(rk_pcie, PCIE_CLIENT_DBG_FIFO_PTN_HIT_D1,
+ PCIE_CLIENT_DBG_TRANSITION_DATA);
+ rk_pcie_writel_apb(rk_pcie, PCIE_CLIENT_DBG_FIFO_TRN_HIT_D0,
+ PCIE_CLIENT_DBG_TRANSITION_DATA);
+ rk_pcie_writel_apb(rk_pcie, PCIE_CLIENT_DBG_FIFO_TRN_HIT_D1,
+ PCIE_CLIENT_DBG_TRANSITION_DATA);
+ rk_pcie_writel_apb(rk_pcie, PCIE_CLIENT_DBG_FIFO_MODE_CON,
+ PCIE_CLIENT_DBF_EN);
+}
+
+static void rk_pcie_debug_dump(struct rk_pcie *rk_pcie)
+{
+ u32 loop;
+
+ debug("ltssm = 0x%x\n",
+ rk_pcie_readl_apb(rk_pcie, PCIE_CLIENT_LTSSM_STATUS));
+ for (loop = 0; loop < 64; loop++)
+ debug("fifo_status = 0x%x\n",
+ rk_pcie_readl_apb(rk_pcie, PCIE_CLIENT_DBG_FIFO_STATUS));
+}
+
+static inline void rk_pcie_link_status_clear(struct rk_pcie *rk_pcie)
+{
+ rk_pcie_writel_apb(rk_pcie, PCIE_CLIENT_GENERAL_DEBUG, 0x0);
+}
+
+static inline void rk_pcie_disable_ltssm(struct rk_pcie *rk_pcie)
+{
+ rk_pcie_writel_apb(rk_pcie, 0x0, 0xc0008);
+}
+
+static inline void rk_pcie_enable_ltssm(struct rk_pcie *rk_pcie)
+{
+ rk_pcie_writel_apb(rk_pcie, 0x0, 0xc000c);
+}
+
+static int is_link_up(struct rk_pcie *priv)
+{
+ u32 val;
+
+ val = rk_pcie_readl_apb(priv, PCIE_CLIENT_LTSSM_STATUS);
+ if ((val & (RDLH_LINKUP | SMLH_LINKUP)) == 0x30000 &&
+ (val & GENMASK(5, 0)) == 0x11)
+ return 1;
+
+ return 0;
+}
+
+/**
+ * rk_pcie_link_up() - Wait for the link to come up
+ *
+ * @rk_pcie: Pointer to the PCI controller state
+ * @cap_speed: Desired link speed
+ *
+ * Return: 1 (true) for active line and negetive (false) for no link (timeout)
+ */
+static int rk_pcie_link_up(struct rk_pcie *priv, u32 cap_speed)
+{
+ int retries;
+
+ if (is_link_up(priv)) {
+ printf("PCI Link already up before configuration!\n");
+ return 1;
+ }
+
+ /* DW pre link configurations */
+ rk_pcie_configure(priv, cap_speed);
+
+ /* Rest the device */
+ if (dm_gpio_is_valid(&priv->rst_gpio)) {
+ dm_gpio_set_value(&priv->rst_gpio, 0);
+ /*
+ * Minimal is 100ms from spec but we see
+ * some wired devices need much more, such as 600ms.
+ * Add a enough delay to cover all cases.
+ */
+ msleep(PERST_WAIT_MS);
+ dm_gpio_set_value(&priv->rst_gpio, 1);
+ }
+
+ rk_pcie_disable_ltssm(priv);
+ rk_pcie_link_status_clear(priv);
+ rk_pcie_enable_debug(priv);
+
+ /* Enable LTSSM */
+ rk_pcie_enable_ltssm(priv);
+
+ for (retries = 0; retries < 5; retries++) {
+ if (is_link_up(priv)) {
+ dev_info(priv->dev, "PCIe Link up, LTSSM is 0x%x\n",
+ rk_pcie_readl_apb(priv, PCIE_CLIENT_LTSSM_STATUS));
+ rk_pcie_debug_dump(priv);
+ return 0;
+ }
+
+ dev_info(priv->dev, "PCIe Linking... LTSSM is 0x%x\n",
+ rk_pcie_readl_apb(priv, PCIE_CLIENT_LTSSM_STATUS));
+ rk_pcie_debug_dump(priv);
+ msleep(1000);
+ }
+
+ dev_err(priv->dev, "PCIe-%d Link Fail\n", dev_seq(priv->dev));
+ /* Link maybe in Gen switch recovery but we need to wait more 1s */
+ msleep(1000);
+ return -EIO;
+}
+
+static int rockchip_pcie_init_port(struct udevice *dev)
+{
+ int ret;
+ u32 val;
+ struct rk_pcie *priv = dev_get_priv(dev);
+
+ /* Set power and maybe external ref clk input */
+ if (priv->vpcie3v3) {
+ ret = regulator_set_value(priv->vpcie3v3, 3300000);
+ if (ret) {
+ dev_err(priv->dev, "failed to enable vpcie3v3 (ret=%d)\n",
+ ret);
+ return ret;
+ }
+ }
+
+ msleep(1000);
+
+ ret = generic_phy_init(&priv->phy);
+ if (ret) {
+ dev_err(dev, "failed to init phy (ret=%d)\n", ret);
+ return ret;
+ }
+
+ ret = generic_phy_power_on(&priv->phy);
+ if (ret) {
+ dev_err(dev, "failed to power on phy (ret=%d)\n", ret);
+ goto err_exit_phy;
+ }
+
+ ret = reset_deassert_bulk(&priv->rsts);
+ if (ret) {
+ dev_err(dev, "failed to deassert resets (ret=%d)\n", ret);
+ goto err_power_off_phy;
+ }
+
+ ret = clk_enable_bulk(&priv->clks);
+ if (ret) {
+ dev_err(dev, "failed to enable clks (ret=%d)\n", ret);
+ goto err_deassert_bulk;
+ }
+
+ /* LTSSM EN ctrl mode */
+ val = rk_pcie_readl_apb(priv, PCIE_CLIENT_HOT_RESET_CTRL);
+ val |= PCIE_LTSSM_ENABLE_ENHANCE | (PCIE_LTSSM_ENABLE_ENHANCE << 16);
+ rk_pcie_writel_apb(priv, PCIE_CLIENT_HOT_RESET_CTRL, val);
+
+ /* Set RC mode */
+ rk_pcie_writel_apb(priv, 0x0, 0xf00040);
+ rk_pcie_setup_host(priv);
+
+ ret = rk_pcie_link_up(priv, LINK_SPEED_GEN_3);
+ if (ret < 0)
+ goto err_link_up;
+
+ return 0;
+err_link_up:
+ clk_disable_bulk(&priv->clks);
+err_deassert_bulk:
+ reset_assert_bulk(&priv->rsts);
+err_power_off_phy:
+ generic_phy_power_off(&priv->phy);
+err_exit_phy:
+ generic_phy_exit(&priv->phy);
+
+ return ret;
+}
+
+static int rockchip_pcie_parse_dt(struct udevice *dev)
+{
+ struct rk_pcie *priv = dev_get_priv(dev);
+ int ret;
+
+ priv->dbi_base = (void *)dev_read_addr_index(dev, 0);
+ if (!priv->dbi_base)
+ return -ENODEV;
+
+ dev_dbg(dev, "DBI address is 0x%p\n", priv->dbi_base);
+
+ priv->apb_base = (void *)dev_read_addr_index(dev, 1);
+ if (!priv->apb_base)
+ return -ENODEV;
+
+ dev_dbg(dev, "APB address is 0x%p\n", priv->apb_base);
+
+ ret = gpio_request_by_name(dev, "reset-gpios", 0,
+ &priv->rst_gpio, GPIOD_IS_OUT);
+ if (ret) {
+ dev_err(dev, "failed to find reset-gpios property\n");
+ return ret;
+ }
+
+ ret = reset_get_bulk(dev, &priv->rsts);
+ if (ret) {
+ dev_err(dev, "Can't get reset: %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_get_bulk(dev, &priv->clks);
+ if (ret) {
+ dev_err(dev, "Can't get clock: %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 = generic_phy_get_by_index(dev, 0, &priv->phy);
+ if (ret) {
+ dev_err(dev, "failed to get pcie phy (ret=%d)\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * rockchip_pcie_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 rockchip_pcie_probe(struct udevice *dev)
+{
+ struct rk_pcie *priv = dev_get_priv(dev);
+ struct udevice *ctlr = pci_get_controller(dev);
+ struct pci_controller *hose = dev_get_uclass_priv(ctlr);
+ int reti = 0;
+
+ priv->first_busno = dev_seq(dev);
+ priv->dev = dev;
+
+ ret = rockchip_pcie_parse_dt(dev);
+ if (ret)
+ return ret;
+
+ ret = rockchip_pcie_init_port(dev);
+ if (ret)
+ return ret;
+
+ dev_info(dev, "PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n",
+ dev_seq(dev), rk_pcie_get_link_speed(priv),
+ rk_pcie_get_link_width(priv),
+ hose->first_busno);
+
+ for (ret = 0; ret < hose->region_count; ret++) {
+ if (hose->regions[ret].flags == PCI_REGION_IO) {
+ priv->io.phys_start = hose->regions[ret].phys_start; /* IO base */
+ priv->io.bus_start = hose->regions[ret].bus_start; /* IO_bus_addr */
+ priv->io.size = hose->regions[ret].size; /* IO size */
+ } else if (hose->regions[ret].flags == PCI_REGION_MEM) {
+ priv->mem.phys_start = hose->regions[ret].phys_start; /* MEM base */
+ priv->mem.bus_start = hose->regions[ret].bus_start; /* MEM_bus_addr */
+ priv->mem.size = hose->regions[ret].size; /* MEM size */
+ } else if (hose->regions[ret].flags == PCI_REGION_SYS_MEMORY) {
+ priv->cfg_base = (void *)(priv->io.phys_start - priv->io.size);
+ priv->cfg_size = priv->io.size;
+ } else {
+ dev_err(dev, "invalid flags type!\n");
+ }
+ }
+
+ dev_dbg(dev, "Config space: [0x%p - 0x%p, size 0x%llx]\n",
+ priv->cfg_base, priv->cfg_base + priv->cfg_size,
+ priv->cfg_size);
+
+ dev_dbg(dev, "IO space: [0x%llx - 0x%llx, size 0x%lx]\n",
+ priv->io.phys_start, priv->io.phys_start + priv->io.size,
+ priv->io.size);
+
+ dev_dbg(dev, "IO bus: [0x%lx - 0x%lx, size 0x%lx]\n",
+ priv->io.bus_start, priv->io.bus_start + priv->io.size,
+ priv->io.size);
+
+ dev_dbg(dev, "MEM space: [0x%llx - 0x%llx, size 0x%lx]\n",
+ priv->mem.phys_start, priv->mem.phys_start + priv->mem.size,
+ priv->mem.size);
+
+ dev_dbg(dev, "MEM bus: [0x%lx - 0x%lx, size 0x%lx]\n",
+ priv->mem.bus_start, priv->mem.bus_start + priv->mem.size,
+ priv->mem.size);
+
+ return rk_pcie_prog_outbound_atu_unroll(priv,
+ PCIE_ATU_REGION_INDEX0,
+ PCIE_ATU_TYPE_MEM,
+ priv->mem.phys_start,
+ priv->mem.bus_start,
+ priv->mem.size);
+}
+
+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,rk3568-pcie" },
+ { }
+};
+
+U_BOOT_DRIVER(rockchip_dw_pcie) = {
+ .name = "pcie_dw_rockchip",
+ .id = UCLASS_PCI,
+ .of_match = rockchip_pcie_ids,
+ .ops = &rockchip_pcie_ops,
+ .probe = rockchip_pcie_probe,
+ .priv_auto = sizeof(struct rk_pcie),
+};
projects / platform / kernel / u-boot.git / commitdiff