--- /dev/null
+/*
+ * Renesas RCar Gen2 PCIEC driver
+ *
+ * Copyright (C) 2018 Marek Vasut <marek.vasut@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <clk.h>
+#include <dm.h>
+#include <errno.h>
+#include <pci.h>
+
+/* AHB-PCI Bridge PCI communication registers */
+#define RCAR_AHBPCI_PCICOM_OFFSET 0x800
+
+#define RCAR_PCIAHB_WIN1_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x00)
+#define RCAR_PCIAHB_WIN2_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x04)
+#define RCAR_PCIAHB_PREFETCH0 0x0
+#define RCAR_PCIAHB_PREFETCH4 0x1
+#define RCAR_PCIAHB_PREFETCH8 0x2
+#define RCAR_PCIAHB_PREFETCH16 0x3
+
+#define RCAR_AHBPCI_WIN1_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x10)
+#define RCAR_AHBPCI_WIN2_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x14)
+#define RCAR_AHBPCI_WIN_CTR_MEM (3 << 1)
+#define RCAR_AHBPCI_WIN_CTR_CFG (5 << 1)
+#define RCAR_AHBPCI_WIN1_HOST BIT(30)
+#define RCAR_AHBPCI_WIN1_DEVICE BIT(31)
+
+#define RCAR_PCI_INT_ENABLE_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x20)
+#define RCAR_PCI_INT_STATUS_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x24)
+#define RCAR_PCI_INT_SIGTABORT BIT(0)
+#define RCAR_PCI_INT_SIGRETABORT BIT(1)
+#define RCAR_PCI_INT_REMABORT BIT(2)
+#define RCAR_PCI_INT_PERR BIT(3)
+#define RCAR_PCI_INT_SIGSERR BIT(4)
+#define RCAR_PCI_INT_RESERR BIT(5)
+#define RCAR_PCI_INT_WIN1ERR BIT(12)
+#define RCAR_PCI_INT_WIN2ERR BIT(13)
+#define RCAR_PCI_INT_A BIT(16)
+#define RCAR_PCI_INT_B BIT(17)
+#define RCAR_PCI_INT_PME BIT(19)
+#define RCAR_PCI_INT_ALLERRORS (RCAR_PCI_INT_SIGTABORT | \
+ RCAR_PCI_INT_SIGRETABORT | \
+ RCAR_PCI_INT_SIGRETABORT | \
+ RCAR_PCI_INT_REMABORT | \
+ RCAR_PCI_INT_PERR | \
+ RCAR_PCI_INT_SIGSERR | \
+ RCAR_PCI_INT_RESERR | \
+ RCAR_PCI_INT_WIN1ERR | \
+ RCAR_PCI_INT_WIN2ERR)
+
+#define RCAR_AHB_BUS_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x30)
+#define RCAR_AHB_BUS_MMODE_HTRANS BIT(0)
+#define RCAR_AHB_BUS_MMODE_BYTE_BURST BIT(1)
+#define RCAR_AHB_BUS_MMODE_WR_INCR BIT(2)
+#define RCAR_AHB_BUS_MMODE_HBUS_REQ BIT(7)
+#define RCAR_AHB_BUS_SMODE_READYCTR BIT(17)
+#define RCAR_AHB_BUS_MODE (RCAR_AHB_BUS_MMODE_HTRANS | \
+ RCAR_AHB_BUS_MMODE_BYTE_BURST | \
+ RCAR_AHB_BUS_MMODE_WR_INCR | \
+ RCAR_AHB_BUS_MMODE_HBUS_REQ | \
+ RCAR_AHB_BUS_SMODE_READYCTR)
+
+#define RCAR_USBCTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x34)
+#define RCAR_USBCTR_USBH_RST BIT(0)
+#define RCAR_USBCTR_PCICLK_MASK BIT(1)
+#define RCAR_USBCTR_PLL_RST BIT(2)
+#define RCAR_USBCTR_DIRPD BIT(8)
+#define RCAR_USBCTR_PCIAHB_WIN2_EN BIT(9)
+#define RCAR_USBCTR_PCIAHB_WIN1_256M (0 << 10)
+#define RCAR_USBCTR_PCIAHB_WIN1_512M (1 << 10)
+#define RCAR_USBCTR_PCIAHB_WIN1_1G (2 << 10)
+#define RCAR_USBCTR_PCIAHB_WIN1_2G (3 << 10)
+#define RCAR_USBCTR_PCIAHB_WIN1_MASK (3 << 10)
+
+#define RCAR_PCI_ARBITER_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x40)
+#define RCAR_PCI_ARBITER_PCIREQ0 BIT(0)
+#define RCAR_PCI_ARBITER_PCIREQ1 BIT(1)
+#define RCAR_PCI_ARBITER_PCIBP_MODE BIT(12)
+
+#define RCAR_PCI_UNIT_REV_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x48)
+
+struct rcar_gen2_pci_priv {
+ fdt_addr_t cfg_base;
+ fdt_addr_t mem_base;
+};
+
+static int rcar_gen2_pci_addr_valid(pci_dev_t d, uint offset)
+{
+ u32 slot;
+
+ if (PCI_FUNC(d))
+ return -EINVAL;
+
+ /* Only one EHCI/OHCI device built-in */
+ slot = PCI_DEV(d);
+ if (slot > 2)
+ return -EINVAL;
+
+ /* bridge logic only has registers to 0x40 */
+ if (slot == 0x0 && offset >= 0x40)
+ return -EINVAL;
+
+ return 0;
+}
+
+static u32 get_bus_address(struct udevice *dev, pci_dev_t bdf, u32 offset)
+{
+ struct rcar_gen2_pci_priv *priv = dev_get_priv(dev);
+
+ return priv->cfg_base + (PCI_DEV(bdf) >> 1) * 0x100 + (offset & ~3);
+}
+
+static u32 setup_bus_address(struct udevice *dev, pci_dev_t bdf, u32 offset)
+{
+ struct rcar_gen2_pci_priv *priv = dev_get_priv(dev);
+ u32 reg;
+
+ reg = PCI_DEV(bdf) ? RCAR_AHBPCI_WIN1_DEVICE : RCAR_AHBPCI_WIN1_HOST;
+ reg |= RCAR_AHBPCI_WIN_CTR_CFG;
+ writel(reg, priv->cfg_base + RCAR_AHBPCI_WIN1_CTR_REG);
+
+ return get_bus_address(dev, bdf, offset);
+}
+
+static int rcar_gen2_pci_read_config(struct udevice *dev, pci_dev_t bdf,
+ uint offset, ulong *value,
+ enum pci_size_t size)
+{
+ u32 addr, reg;
+ int ret;
+
+ ret = rcar_gen2_pci_addr_valid(bdf, offset);
+ if (ret) {
+ *value = pci_get_ff(size);
+ return 0;
+ }
+
+ addr = get_bus_address(dev, bdf, offset);
+ reg = readl(addr);
+ *value = pci_conv_32_to_size(reg, offset, size);
+
+ return 0;
+}
+
+static int rcar_gen2_pci_write_config(struct udevice *dev, pci_dev_t bdf,
+ uint offset, ulong value,
+ enum pci_size_t size)
+{
+ u32 addr, reg, old;
+ int ret;
+
+ ret = rcar_gen2_pci_addr_valid(bdf, offset);
+ if (ret)
+ return ret;
+
+ addr = get_bus_address(dev, bdf, offset);
+
+ old = readl(addr);
+ reg = pci_conv_size_to_32(old, value, offset, size);
+ writel(reg, addr);
+
+ return 0;
+}
+
+static int rcar_gen2_pci_probe(struct udevice *dev)
+{
+ struct rcar_gen2_pci_priv *priv = dev_get_priv(dev);
+ struct clk pci_clk;
+ u32 devad;
+ int ret;
+
+ ret = clk_get_by_index(dev, 0, &pci_clk);
+ if (ret)
+ return ret;
+
+ ret = clk_enable(&pci_clk);
+ if (ret)
+ return ret;
+
+ /* Clock & Reset & Direct Power Down */
+ clrsetbits_le32(priv->cfg_base + RCAR_USBCTR_REG,
+ RCAR_USBCTR_DIRPD | RCAR_USBCTR_PCICLK_MASK |
+ RCAR_USBCTR_USBH_RST,
+ RCAR_USBCTR_PCIAHB_WIN1_1G);
+ clrbits_le32(priv->cfg_base + RCAR_USBCTR_REG, RCAR_USBCTR_PLL_RST);
+
+ /* AHB-PCI Bridge Communication Registers */
+ writel(RCAR_AHB_BUS_MODE, priv->cfg_base + RCAR_AHB_BUS_CTR_REG);
+ writel((CONFIG_SYS_SDRAM_BASE & 0xf0000000) | RCAR_PCIAHB_PREFETCH16,
+ priv->cfg_base + RCAR_PCIAHB_WIN1_CTR_REG);
+ writel(0xf0000000 | RCAR_PCIAHB_PREFETCH16,
+ priv->cfg_base + RCAR_PCIAHB_WIN2_CTR_REG);
+ writel(priv->mem_base | RCAR_AHBPCI_WIN_CTR_MEM,
+ priv->cfg_base + RCAR_AHBPCI_WIN2_CTR_REG);
+ setbits_le32(priv->cfg_base + RCAR_PCI_ARBITER_CTR_REG,
+ RCAR_PCI_ARBITER_PCIREQ0 | RCAR_PCI_ARBITER_PCIREQ1 |
+ RCAR_PCI_ARBITER_PCIBP_MODE);
+
+ /* PCI Configuration Registers for AHBPCI */
+ devad = setup_bus_address(dev, PCI_BDF(0, 0, 0), 0);
+ writel(priv->cfg_base + 0x800, devad + PCI_BASE_ADDRESS_0);
+ writel(CONFIG_SYS_SDRAM_BASE & 0xf0000000, devad + PCI_BASE_ADDRESS_1);
+ writel(0xf0000000, devad + PCI_BASE_ADDRESS_2);
+ writel(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+ PCI_COMMAND_PARITY | PCI_COMMAND_SERR,
+ devad + PCI_COMMAND);
+
+ /* PCI Configuration Registers for OHCI */
+ devad = setup_bus_address(dev, PCI_BDF(0, 1, 0), 0);
+ writel(priv->mem_base + 0x0, devad + PCI_BASE_ADDRESS_0);
+ writel(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+ PCI_COMMAND_PARITY | PCI_COMMAND_SERR,
+ devad + PCI_COMMAND);
+
+ /* PCI Configuration Registers for EHCI */
+ devad = setup_bus_address(dev, PCI_BDF(0, 2, 0), 0);
+ writel(priv->mem_base + 0x1000, devad + PCI_BASE_ADDRESS_0);
+ writel(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+ PCI_COMMAND_PARITY | PCI_COMMAND_SERR,
+ devad + PCI_COMMAND);
+
+ /* Enable PCI interrupt */
+ setbits_le32(priv->cfg_base + RCAR_PCI_INT_ENABLE_REG,
+ RCAR_PCI_INT_A | RCAR_PCI_INT_B | RCAR_PCI_INT_PME);
+
+ return 0;
+}
+
+static int rcar_gen2_pci_ofdata_to_platdata(struct udevice *dev)
+{
+ struct rcar_gen2_pci_priv *priv = dev_get_priv(dev);
+
+ priv->cfg_base = devfdt_get_addr_index(dev, 0);
+ priv->mem_base = devfdt_get_addr_index(dev, 1);
+ if (!priv->cfg_base || !priv->mem_base)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const struct dm_pci_ops rcar_gen2_pci_ops = {
+ .read_config = rcar_gen2_pci_read_config,
+ .write_config = rcar_gen2_pci_write_config,
+};
+
+static const struct udevice_id rcar_gen2_pci_ids[] = {
+ { .compatible = "renesas,pci-rcar-gen2" },
+ { }
+};
+
+U_BOOT_DRIVER(rcar_gen2_pci) = {
+ .name = "rcar_gen2_pci",
+ .id = UCLASS_PCI,
+ .of_match = rcar_gen2_pci_ids,
+ .ops = &rcar_gen2_pci_ops,
+ .probe = rcar_gen2_pci_probe,
+ .ofdata_to_platdata = rcar_gen2_pci_ofdata_to_platdata,
+ .priv_auto_alloc_size = sizeof(struct rcar_gen2_pci_priv),
+};
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