pci: Add Rockchip dwc based PCIe controller driver

Add Rockchip dwc based PCIe controller driver for rk356x platform.
Driver support Gen3 by operating as a Root complex.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kever Yang<kever.yang@rock-chips.com>

3 files changed, 887 insertions, 0 deletions

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 65498bce1d9..b1de38f7662 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -281,6 +281,15 @@ config PCIE_ROCKCHIP
 	  Say Y here if you want to enable PCIe controller support on
 	  Rockchip SoCs.
 
+config PCIE_DW_ROCKCHIP
+	bool "Rockchip DesignWare based PCIe controller"
+	depends on ARCH_ROCKCHIP
+	select DM_PCI
+	select PHY_ROCKCHIP_SNPS_PCIE3
+	help
+	  Say Y here if you want to enable DW PCIe controller support on
+	  Rockchip SoCs.
+
 config PCI_BRCMSTB
 	bool "Broadcom STB PCIe controller"
 	depends on DM_PCI
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 8b4d49a5903..5ed94bc95c2 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -48,5 +48,6 @@ obj-$(CONFIG_PCIE_INTEL_FPGA) += pcie_intel_fpga.o
 obj-$(CONFIG_PCI_KEYSTONE) += pcie_dw_ti.o
 obj-$(CONFIG_PCIE_MEDIATEK) += pcie_mediatek.o
 obj-$(CONFIG_PCIE_ROCKCHIP) += pcie_rockchip.o
+obj-$(CONFIG_PCIE_DW_ROCKCHIP) += pcie_dw_rockchip.o
 obj-$(CONFIG_PCI_BRCMSTB) += pcie_brcmstb.o
 obj-$(CONFIG_PCI_OCTEONTX) += pci_octeontx.o
diff --git a/drivers/pci/pcie_dw_rockchip.c b/drivers/pci/pcie_dw_rockchip.c
new file mode 100644
index 00000000000..15270627b0d
--- /dev/null
+++ b/drivers/pci/pcie_dw_rockchip.c
@@ -0,0 +1,877 @@
+// 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),
+};