// SPDX-License-Identifier: GPL-2.0 /* * Renesas RCar Gen3 PCIEC driver * * Copyright (C) 2018-2019 Marek Vasut * * Based on Linux PCIe driver for Renesas R-Car SoCs * Copyright (C) 2014 Renesas Electronics Europe Ltd * * Based on: * arch/sh/drivers/pci/pcie-sh7786.c * arch/sh/drivers/pci/ops-sh7786.c * Copyright (C) 2009 - 2011 Paul Mundt * * Author: Phil Edworthy */ #include #include #include #include #include #include #include #include #define PCIECAR 0x000010 #define PCIECCTLR 0x000018 #define SEND_ENABLE BIT(31) #define TYPE0 (0 << 8) #define TYPE1 BIT(8) #define PCIECDR 0x000020 #define PCIEMSR 0x000028 #define PCIEINTXR 0x000400 #define PCIEPHYSR 0x0007f0 #define PHYRDY BIT(0) #define PCIEMSITXR 0x000840 /* Transfer control */ #define PCIETCTLR 0x02000 #define CFINIT 1 #define PCIETSTR 0x02004 #define DATA_LINK_ACTIVE 1 #define PCIEERRFR 0x02020 #define UNSUPPORTED_REQUEST BIT(4) #define PCIEMSIFR 0x02044 #define PCIEMSIALR 0x02048 #define MSIFE 1 #define PCIEMSIAUR 0x0204c #define PCIEMSIIER 0x02050 /* root port address */ #define PCIEPRAR(x) (0x02080 + ((x) * 0x4)) /* local address reg & mask */ #define PCIELAR(x) (0x02200 + ((x) * 0x20)) #define PCIELAMR(x) (0x02208 + ((x) * 0x20)) #define LAM_PREFETCH BIT(3) #define LAM_64BIT BIT(2) #define LAR_ENABLE BIT(1) /* PCIe address reg & mask */ #define PCIEPALR(x) (0x03400 + ((x) * 0x20)) #define PCIEPAUR(x) (0x03404 + ((x) * 0x20)) #define PCIEPAMR(x) (0x03408 + ((x) * 0x20)) #define PCIEPTCTLR(x) (0x0340c + ((x) * 0x20)) #define PAR_ENABLE BIT(31) #define IO_SPACE BIT(8) /* Configuration */ #define PCICONF(x) (0x010000 + ((x) * 0x4)) #define PMCAP(x) (0x010040 + ((x) * 0x4)) #define EXPCAP(x) (0x010070 + ((x) * 0x4)) #define VCCAP(x) (0x010100 + ((x) * 0x4)) /* link layer */ #define IDSETR1 0x011004 #define TLCTLR 0x011048 #define MACSR 0x011054 #define SPCHGFIN BIT(4) #define SPCHGFAIL BIT(6) #define SPCHGSUC BIT(7) #define LINK_SPEED (0xf << 16) #define LINK_SPEED_2_5GTS (1 << 16) #define LINK_SPEED_5_0GTS (2 << 16) #define MACCTLR 0x011058 #define SPEED_CHANGE BIT(24) #define SCRAMBLE_DISABLE BIT(27) #define MACS2R 0x011078 #define MACCGSPSETR 0x011084 #define SPCNGRSN BIT(31) /* R-Car H1 PHY */ #define H1_PCIEPHYADRR 0x04000c #define WRITE_CMD BIT(16) #define PHY_ACK BIT(24) #define RATE_POS 12 #define LANE_POS 8 #define ADR_POS 0 #define H1_PCIEPHYDOUTR 0x040014 /* R-Car Gen2 PHY */ #define GEN2_PCIEPHYADDR 0x780 #define GEN2_PCIEPHYDATA 0x784 #define GEN2_PCIEPHYCTRL 0x78c #define INT_PCI_MSI_NR 32 #define RCONF(x) (PCICONF(0) + (x)) #define RPMCAP(x) (PMCAP(0) + (x)) #define REXPCAP(x) (EXPCAP(0) + (x)) #define RVCCAP(x) (VCCAP(0) + (x)) #define PCIE_CONF_BUS(b) (((b) & 0xff) << 24) #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 19) #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 16) #define RCAR_PCI_MAX_RESOURCES 4 #define MAX_NR_INBOUND_MAPS 6 enum { RCAR_PCI_ACCESS_READ, RCAR_PCI_ACCESS_WRITE, }; struct rcar_gen3_pcie_priv { fdt_addr_t regs; }; static void rcar_rmw32(struct udevice *dev, int where, u32 mask, u32 data) { struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev); int shift = 8 * (where & 3); clrsetbits_le32(priv->regs + (where & ~3), mask << shift, data << shift); } static u32 rcar_read_conf(const struct udevice *dev, int where) { struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev); int shift = 8 * (where & 3); return readl(priv->regs + (where & ~3)) >> shift; } static int rcar_pcie_config_access(const struct udevice *udev, unsigned char access_type, pci_dev_t bdf, int where, ulong *data) { struct rcar_gen3_pcie_priv *priv = dev_get_plat(udev); u32 reg = where & ~3; /* Root bus */ if (PCI_DEV(bdf) == 0) { if (access_type == RCAR_PCI_ACCESS_READ) *data = readl(priv->regs + PCICONF(where / 4)); else writel(*data, priv->regs + PCICONF(where / 4)); return 0; } /* Clear errors */ clrbits_le32(priv->regs + PCIEERRFR, 0); /* Set the PIO address */ writel((bdf << 8) | reg, priv->regs + PCIECAR); /* Enable the configuration access */ if (!PCI_BUS(bdf)) writel(SEND_ENABLE | TYPE0, priv->regs + PCIECCTLR); else writel(SEND_ENABLE | TYPE1, priv->regs + PCIECCTLR); /* Check for errors */ if (readl(priv->regs + PCIEERRFR) & UNSUPPORTED_REQUEST) return -ENODEV; /* Check for master and target aborts */ if (rcar_read_conf(udev, RCONF(PCI_STATUS)) & (PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT)) return -ENODEV; if (access_type == RCAR_PCI_ACCESS_READ) *data = readl(priv->regs + PCIECDR); else writel(*data, priv->regs + PCIECDR); /* Disable the configuration access */ writel(0, priv->regs + PCIECCTLR); return 0; } static int rcar_gen3_pcie_addr_valid(pci_dev_t d, uint where) { u32 slot; if (PCI_BUS(d)) return -EINVAL; if (PCI_FUNC(d)) return -EINVAL; slot = PCI_DEV(d); if (slot > 1) return -EINVAL; return 0; } static int rcar_gen3_pcie_read_config(const struct udevice *dev, pci_dev_t bdf, uint where, ulong *val, enum pci_size_t size) { ulong reg; int ret; ret = rcar_gen3_pcie_addr_valid(bdf, where); if (ret) { *val = pci_get_ff(size); return 0; } ret = rcar_pcie_config_access(dev, RCAR_PCI_ACCESS_READ, bdf, where, ®); if (ret != 0) reg = 0xffffffffUL; *val = pci_conv_32_to_size(reg, where, size); return ret; } static int rcar_gen3_pcie_write_config(struct udevice *dev, pci_dev_t bdf, uint where, ulong val, enum pci_size_t size) { ulong data; int ret; ret = rcar_gen3_pcie_addr_valid(bdf, where); if (ret) return ret; data = pci_conv_32_to_size(val, where, size); ret = rcar_pcie_config_access(dev, RCAR_PCI_ACCESS_WRITE, bdf, where, &data); return ret; } static int rcar_gen3_pcie_wait_for_phyrdy(struct udevice *dev) { struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev); return wait_for_bit_le32((void *)priv->regs + PCIEPHYSR, PHYRDY, true, 50, false); } static int rcar_gen3_pcie_wait_for_dl(struct udevice *dev) { struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev); return wait_for_bit_le32((void *)priv->regs + PCIETSTR, DATA_LINK_ACTIVE, true, 50, false); } static int rcar_gen3_pcie_hw_init(struct udevice *dev) { struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev); int ret; /* Begin initialization */ writel(0, priv->regs + PCIETCTLR); /* Set mode */ writel(1, priv->regs + PCIEMSR); ret = rcar_gen3_pcie_wait_for_phyrdy(dev); if (ret) return ret; /* * Initial header for port config space is type 1, set the device * class to match. Hardware takes care of propagating the IDSETR * settings, so there is no need to bother with a quirk. */ writel(PCI_CLASS_BRIDGE_PCI_NORMAL << 8, priv->regs + IDSETR1); /* * Setup Secondary Bus Number & Subordinate Bus Number, even though * they aren't used, to avoid bridge being detected as broken. */ rcar_rmw32(dev, RCONF(PCI_SECONDARY_BUS), 0xff, 1); rcar_rmw32(dev, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1); /* Initialize default capabilities. */ rcar_rmw32(dev, REXPCAP(0), 0xff, PCI_CAP_ID_EXP); rcar_rmw32(dev, REXPCAP(PCI_EXP_FLAGS), PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4); rcar_rmw32(dev, RCONF(PCI_HEADER_TYPE), 0x7f, PCI_HEADER_TYPE_BRIDGE); /* Enable data link layer active state reporting */ rcar_rmw32(dev, REXPCAP(PCI_EXP_LNKCAP), PCI_EXP_LNKCAP_DLLLARC, PCI_EXP_LNKCAP_DLLLARC); /* Write out the physical slot number = 0 */ rcar_rmw32(dev, REXPCAP(PCI_EXP_SLTCAP), PCI_EXP_SLTCAP_PSN, 0); /* Set the completion timer timeout to the maximum 50ms. */ rcar_rmw32(dev, TLCTLR + 1, 0x3f, 50); /* Terminate list of capabilities (Next Capability Offset=0) */ rcar_rmw32(dev, RVCCAP(0), 0xfff00000, 0); /* Finish initialization - establish a PCI Express link */ writel(CFINIT, priv->regs + PCIETCTLR); return rcar_gen3_pcie_wait_for_dl(dev); } static int rcar_gen3_pcie_probe(struct udevice *dev) { struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev); struct pci_controller *hose = dev_get_uclass_priv(dev); struct clk pci_clk; u32 mask; int i, cnt, ret; ret = clk_get_by_index(dev, 0, &pci_clk); if (ret) return ret; ret = clk_enable(&pci_clk); if (ret) return ret; for (i = 0; i < hose->region_count; i++) { if (hose->regions[i].flags != PCI_REGION_SYS_MEMORY) continue; if (hose->regions[i].phys_start == 0) continue; mask = (roundup_pow_of_two(hose->regions[i].size) - 1) & ~0xf; mask |= LAR_ENABLE; writel(rounddown_pow_of_two(hose->regions[i].phys_start), priv->regs + PCIEPRAR(0)); writel(rounddown_pow_of_two(hose->regions[i].phys_start), priv->regs + PCIELAR(0)); writel(mask, priv->regs + PCIELAMR(0)); break; } writel(0, priv->regs + PCIEPRAR(1)); writel(0, priv->regs + PCIELAR(1)); writel(0, priv->regs + PCIELAMR(1)); ret = rcar_gen3_pcie_hw_init(dev); if (ret) return ret; for (i = 0, cnt = 0; i < hose->region_count; i++) { if (hose->regions[i].flags == PCI_REGION_SYS_MEMORY) continue; writel(0, priv->regs + PCIEPTCTLR(cnt)); writel((hose->regions[i].size - 1) & ~0x7f, priv->regs + PCIEPAMR(cnt)); writel(upper_32_bits(hose->regions[i].phys_start), priv->regs + PCIEPAUR(cnt)); writel(lower_32_bits(hose->regions[i].phys_start), priv->regs + PCIEPALR(cnt)); mask = PAR_ENABLE; if (hose->regions[i].flags == PCI_REGION_IO) mask |= IO_SPACE; writel(mask, priv->regs + PCIEPTCTLR(cnt)); cnt++; } return 0; } static int rcar_gen3_pcie_of_to_plat(struct udevice *dev) { struct rcar_gen3_pcie_priv *priv = dev_get_plat(dev); priv->regs = devfdt_get_addr_index(dev, 0); if (!priv->regs) return -EINVAL; return 0; } static const struct dm_pci_ops rcar_gen3_pcie_ops = { .read_config = rcar_gen3_pcie_read_config, .write_config = rcar_gen3_pcie_write_config, }; static const struct udevice_id rcar_gen3_pcie_ids[] = { { .compatible = "renesas,pcie-rcar-gen3" }, { } }; U_BOOT_DRIVER(rcar_gen3_pcie) = { .name = "rcar_gen3_pcie", .id = UCLASS_PCI, .of_match = rcar_gen3_pcie_ids, .ops = &rcar_gen3_pcie_ops, .probe = rcar_gen3_pcie_probe, .of_to_plat = rcar_gen3_pcie_of_to_plat, .plat_auto = sizeof(struct rcar_gen3_pcie_priv), };