/* * 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 * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include #include #include #include #include #include #include #include #include #include #include #include #define DRV_NAME "rcar-pcie" #define PCIECAR 0x000010 #define PCIECCTLR 0x000018 #define CONFIG_SEND_ENABLE (1 << 31) #define TYPE0 (0 << 8) #define TYPE1 (1 << 8) #define PCIECDR 0x000020 #define PCIEMSR 0x000028 #define PCIEINTXR 0x000400 /* Transfer control */ #define PCIETCTLR 0x02000 #define CFINIT 1 #define PCIETSTR 0x02004 #define DATA_LINK_ACTIVE 1 #define PCIEERRFR 0x02020 #define UNSUPPORTED_REQUEST (1 << 4) /* 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 (1 << 3) #define LAM_64BIT (1 << 2) #define LAR_ENABLE (1 << 1) /* PCIe address reg & mask */ #define PCIEPARL(x) (0x03400 + ((x) * 0x20)) #define PCIEPARH(x) (0x03404 + ((x) * 0x20)) #define PCIEPAMR(x) (0x03408 + ((x) * 0x20)) #define PCIEPTCTLR(x) (0x0340c + ((x) * 0x20)) #define PAR_ENABLE (1 << 31) #define IO_SPACE (1 << 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 MACCTLR 0x011058 #define SCRAMBLE_DISABLE (1 << 27) /* R-Car H1 PHY */ #define H1_PCIEPHYADRR 0x04000c #define WRITE_CMD (1 << 16) #define PHY_ACK (1 << 24) #define RATE_POS 12 #define LANE_POS 8 #define ADR_POS 0 #define H1_PCIEPHYDOUTR 0x040014 #define H1_PCIEPHYSR 0x040018 #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 PCI_MAX_RESOURCES 4 #define MAX_NR_INBOUND_MAPS 6 /* Structure representing the PCIe interface */ struct rcar_pcie { struct device *dev; void __iomem *base; struct resource res[PCI_MAX_RESOURCES]; struct resource busn; int root_bus_nr; struct clk *clk; struct clk *bus_clk; }; static inline struct rcar_pcie *sys_to_pcie(struct pci_sys_data *sys) { return sys->private_data; } static void pci_write_reg(struct rcar_pcie *pcie, unsigned long val, unsigned long reg) { writel(val, pcie->base + reg); } static unsigned long pci_read_reg(struct rcar_pcie *pcie, unsigned long reg) { return readl(pcie->base + reg); } enum { PCI_ACCESS_READ, PCI_ACCESS_WRITE, }; static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data) { int shift = 8 * (where & 3); u32 val = pci_read_reg(pcie, where & ~3); val &= ~(mask << shift); val |= data << shift; pci_write_reg(pcie, val, where & ~3); } static u32 rcar_read_conf(struct rcar_pcie *pcie, int where) { int shift = 8 * (where & 3); u32 val = pci_read_reg(pcie, where & ~3); return val >> shift; } /* Serialization is provided by 'pci_lock' in drivers/pci/access.c */ static int rcar_pcie_config_access(struct rcar_pcie *pcie, unsigned char access_type, struct pci_bus *bus, unsigned int devfn, int where, u32 *data) { int dev, func, reg, index; dev = PCI_SLOT(devfn); func = PCI_FUNC(devfn); reg = where & ~3; index = reg / 4; /* * While each channel has its own memory-mapped extended config * space, it's generally only accessible when in endpoint mode. * When in root complex mode, the controller is unable to target * itself with either type 0 or type 1 accesses, and indeed, any * controller initiated target transfer to its own config space * result in a completer abort. * * Each channel effectively only supports a single device, but as * the same channel <-> device access works for any PCI_SLOT() * value, we cheat a bit here and bind the controller's config * space to devfn 0 in order to enable self-enumeration. In this * case the regular ECAR/ECDR path is sidelined and the mangled * config access itself is initiated as an internal bus transaction. */ if (pci_is_root_bus(bus)) { if (dev != 0) return PCIBIOS_DEVICE_NOT_FOUND; if (access_type == PCI_ACCESS_READ) { *data = pci_read_reg(pcie, PCICONF(index)); } else { /* Keep an eye out for changes to the root bus number */ if (pci_is_root_bus(bus) && (reg == PCI_PRIMARY_BUS)) pcie->root_bus_nr = *data & 0xff; pci_write_reg(pcie, *data, PCICONF(index)); } return PCIBIOS_SUCCESSFUL; } if (pcie->root_bus_nr < 0) return PCIBIOS_DEVICE_NOT_FOUND; /* Clear errors */ pci_write_reg(pcie, pci_read_reg(pcie, PCIEERRFR), PCIEERRFR); /* Set the PIO address */ pci_write_reg(pcie, PCIE_CONF_BUS(bus->number) | PCIE_CONF_DEV(dev) | PCIE_CONF_FUNC(func) | reg, PCIECAR); /* Enable the configuration access */ if (bus->parent->number == pcie->root_bus_nr) pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE0, PCIECCTLR); else pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE1, PCIECCTLR); /* Check for errors */ if (pci_read_reg(pcie, PCIEERRFR) & UNSUPPORTED_REQUEST) return PCIBIOS_DEVICE_NOT_FOUND; /* Check for master and target aborts */ if (rcar_read_conf(pcie, RCONF(PCI_STATUS)) & (PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT)) return PCIBIOS_DEVICE_NOT_FOUND; if (access_type == PCI_ACCESS_READ) *data = pci_read_reg(pcie, PCIECDR); else pci_write_reg(pcie, *data, PCIECDR); /* Disable the configuration access */ pci_write_reg(pcie, 0, PCIECCTLR); return PCIBIOS_SUCCESSFUL; } static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { struct rcar_pcie *pcie = sys_to_pcie(bus->sysdata); int ret; if ((size == 2) && (where & 1)) return PCIBIOS_BAD_REGISTER_NUMBER; else if ((size == 4) && (where & 3)) return PCIBIOS_BAD_REGISTER_NUMBER; ret = rcar_pcie_config_access(pcie, PCI_ACCESS_READ, bus, devfn, where, val); if (ret != PCIBIOS_SUCCESSFUL) { *val = 0xffffffff; return ret; } if (size == 1) *val = (*val >> (8 * (where & 3))) & 0xff; else if (size == 2) *val = (*val >> (8 * (where & 2))) & 0xffff; dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x " "where=0x%04x size=%d val=0x%08lx\n", bus->number, devfn, where, size, (unsigned long)*val); return ret; } /* Serialization is provided by 'pci_lock' in drivers/pci/access.c */ static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { struct rcar_pcie *pcie = sys_to_pcie(bus->sysdata); int shift, ret; u32 data; if ((size == 2) && (where & 1)) return PCIBIOS_BAD_REGISTER_NUMBER; else if ((size == 4) && (where & 3)) return PCIBIOS_BAD_REGISTER_NUMBER; ret = rcar_pcie_config_access(pcie, PCI_ACCESS_READ, bus, devfn, where, &data); if (ret != PCIBIOS_SUCCESSFUL) return ret; dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x " "where=0x%04x size=%d val=0x%08lx\n", bus->number, devfn, where, size, (unsigned long)val); if (size == 1) { shift = 8 * (where & 3); data &= ~(0xff << shift); data |= ((val & 0xff) << shift); } else if (size == 2) { shift = 8 * (where & 2); data &= ~(0xffff << shift); data |= ((val & 0xffff) << shift); } else data = val; ret = rcar_pcie_config_access(pcie, PCI_ACCESS_WRITE, bus, devfn, where, &data); return ret; } static struct pci_ops rcar_pcie_ops = { .read = rcar_pcie_read_conf, .write = rcar_pcie_write_conf, }; static void rcar_pcie_setup_window(int win, struct resource *res, struct rcar_pcie *pcie) { /* Setup PCIe address space mappings for each resource */ resource_size_t size; u32 mask; pci_write_reg(pcie, 0x00000000, PCIEPTCTLR(win)); /* * The PAMR mask is calculated in units of 128Bytes, which * keeps things pretty simple. */ size = resource_size(res); mask = (roundup_pow_of_two(size) / SZ_128) - 1; pci_write_reg(pcie, mask << 7, PCIEPAMR(win)); pci_write_reg(pcie, upper_32_bits(res->start), PCIEPARH(win)); pci_write_reg(pcie, lower_32_bits(res->start), PCIEPARL(win)); /* First resource is for IO */ mask = PAR_ENABLE; if (res->flags & IORESOURCE_IO) mask |= IO_SPACE; pci_write_reg(pcie, mask, PCIEPTCTLR(win)); } static int rcar_pcie_setup(int nr, struct pci_sys_data *sys) { struct rcar_pcie *pcie = sys_to_pcie(sys); struct resource *res; int i; pcie->root_bus_nr = -1; /* Setup PCI resources */ for (i = 0; i < PCI_MAX_RESOURCES; i++) { res = &pcie->res[i]; if (!res->flags) continue; rcar_pcie_setup_window(i, res, pcie); if (res->flags & IORESOURCE_IO) pci_ioremap_io(nr * SZ_64K, res->start); else pci_add_resource(&sys->resources, res); } pci_add_resource(&sys->resources, &pcie->busn); return 1; } struct hw_pci rcar_pci = { .setup = rcar_pcie_setup, .map_irq = of_irq_parse_and_map_pci, .ops = &rcar_pcie_ops, }; static void rcar_pcie_enable(struct rcar_pcie *pcie) { struct platform_device *pdev = to_platform_device(pcie->dev); rcar_pci.nr_controllers = 1; rcar_pci.private_data = (void **)&pcie; pci_common_init_dev(&pdev->dev, &rcar_pci); #ifdef CONFIG_PCI_DOMAINS rcar_pci.domain++; #endif } static int phy_wait_for_ack(struct rcar_pcie *pcie) { unsigned int timeout = 100; while (timeout--) { if (pci_read_reg(pcie, H1_PCIEPHYADRR) & PHY_ACK) return 0; udelay(100); } dev_err(pcie->dev, "Access to PCIe phy timed out\n"); return -ETIMEDOUT; } static void phy_write_reg(struct rcar_pcie *pcie, unsigned int rate, unsigned int addr, unsigned int lane, unsigned int data) { unsigned long phyaddr; phyaddr = WRITE_CMD | ((rate & 1) << RATE_POS) | ((lane & 0xf) << LANE_POS) | ((addr & 0xff) << ADR_POS); /* Set write data */ pci_write_reg(pcie, data, H1_PCIEPHYDOUTR); pci_write_reg(pcie, phyaddr, H1_PCIEPHYADRR); /* Ignore errors as they will be dealt with if the data link is down */ phy_wait_for_ack(pcie); /* Clear command */ pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR); pci_write_reg(pcie, 0, H1_PCIEPHYADRR); /* Ignore errors as they will be dealt with if the data link is down */ phy_wait_for_ack(pcie); } static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie) { unsigned int timeout = 10; while (timeout--) { if ((pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE)) return 0; msleep(5); } return -ETIMEDOUT; } static int rcar_pcie_hw_init(struct rcar_pcie *pcie) { int err; /* Begin initialization */ pci_write_reg(pcie, 0, PCIETCTLR); /* Set mode */ pci_write_reg(pcie, 1, PCIEMSR); /* * 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. */ pci_write_reg(pcie, PCI_CLASS_BRIDGE_PCI << 16, IDSETR1); /* * Setup Secondary Bus Number & Subordinate Bus Number, even though * they aren't used, to avoid bridge being detected as broken. */ rcar_rmw32(pcie, RCONF(PCI_SECONDARY_BUS), 0xff, 1); rcar_rmw32(pcie, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1); /* Initialize default capabilities. */ rcar_rmw32(pcie, REXPCAP(0), 0, PCI_CAP_ID_EXP); rcar_rmw32(pcie, REXPCAP(PCI_EXP_FLAGS), PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4); rcar_rmw32(pcie, RCONF(PCI_HEADER_TYPE), 0x7f, PCI_HEADER_TYPE_BRIDGE); /* Enable data link layer active state reporting */ rcar_rmw32(pcie, REXPCAP(PCI_EXP_LNKCAP), 0, PCI_EXP_LNKCAP_DLLLARC); /* Write out the physical slot number = 0 */ rcar_rmw32(pcie, REXPCAP(PCI_EXP_SLTCAP), PCI_EXP_SLTCAP_PSN, 0); /* Set the completion timer timeout to the maximum 50ms. */ rcar_rmw32(pcie, TLCTLR+1, 0x3f, 50); /* Terminate list of capabilities (Next Capability Offset=0) */ rcar_rmw32(pcie, RVCCAP(0), 0xfff0, 0); /* Enable MAC data scrambling. */ rcar_rmw32(pcie, MACCTLR, SCRAMBLE_DISABLE, 0); /* Finish initialization - establish a PCI Express link */ pci_write_reg(pcie, CFINIT, PCIETCTLR); /* This will timeout if we don't have a link. */ err = rcar_pcie_wait_for_dl(pcie); if (err) return err; /* Enable INTx interrupts */ rcar_rmw32(pcie, PCIEINTXR, 0, 0xF << 8); /* Enable slave Bus Mastering */ rcar_rmw32(pcie, RCONF(PCI_STATUS), PCI_STATUS_DEVSEL_MASK, PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_STATUS_CAP_LIST | PCI_STATUS_DEVSEL_FAST); wmb(); return 0; } static int rcar_pcie_hw_init_h1(struct rcar_pcie *pcie) { unsigned int timeout = 10; /* Initialize the phy */ phy_write_reg(pcie, 0, 0x42, 0x1, 0x0EC34191); phy_write_reg(pcie, 1, 0x42, 0x1, 0x0EC34180); phy_write_reg(pcie, 0, 0x43, 0x1, 0x00210188); phy_write_reg(pcie, 1, 0x43, 0x1, 0x00210188); phy_write_reg(pcie, 0, 0x44, 0x1, 0x015C0014); phy_write_reg(pcie, 1, 0x44, 0x1, 0x015C0014); phy_write_reg(pcie, 1, 0x4C, 0x1, 0x786174A0); phy_write_reg(pcie, 1, 0x4D, 0x1, 0x048000BB); phy_write_reg(pcie, 0, 0x51, 0x1, 0x079EC062); phy_write_reg(pcie, 0, 0x52, 0x1, 0x20000000); phy_write_reg(pcie, 1, 0x52, 0x1, 0x20000000); phy_write_reg(pcie, 1, 0x56, 0x1, 0x00003806); phy_write_reg(pcie, 0, 0x60, 0x1, 0x004B03A5); phy_write_reg(pcie, 0, 0x64, 0x1, 0x3F0F1F0F); phy_write_reg(pcie, 0, 0x66, 0x1, 0x00008000); while (timeout--) { if (pci_read_reg(pcie, H1_PCIEPHYSR)) return rcar_pcie_hw_init(pcie); msleep(5); } return -ETIMEDOUT; } static int rcar_pcie_get_resources(struct platform_device *pdev, struct rcar_pcie *pcie) { struct resource res; int err; err = of_address_to_resource(pdev->dev.of_node, 0, &res); if (err) return err; pcie->clk = devm_clk_get(&pdev->dev, "pcie"); if (IS_ERR(pcie->clk)) { dev_err(pcie->dev, "cannot get platform clock\n"); return PTR_ERR(pcie->clk); } err = clk_prepare_enable(pcie->clk); if (err) goto fail_clk; pcie->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus"); if (IS_ERR(pcie->bus_clk)) { dev_err(pcie->dev, "cannot get pcie bus clock\n"); err = PTR_ERR(pcie->bus_clk); goto fail_clk; } err = clk_prepare_enable(pcie->bus_clk); if (err) goto err_map_reg; pcie->base = devm_ioremap_resource(&pdev->dev, &res); if (IS_ERR(pcie->base)) { err = PTR_ERR(pcie->base); goto err_map_reg; } return 0; err_map_reg: clk_disable_unprepare(pcie->bus_clk); fail_clk: clk_disable_unprepare(pcie->clk); return err; } static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie, struct of_pci_range *range, int *index) { u64 restype = range->flags; u64 cpu_addr = range->cpu_addr; u64 cpu_end = range->cpu_addr + range->size; u64 pci_addr = range->pci_addr; u32 flags = LAM_64BIT | LAR_ENABLE; u64 mask; u64 size; int idx = *index; if (restype & IORESOURCE_PREFETCH) flags |= LAM_PREFETCH; /* * If the size of the range is larger than the alignment of the start * address, we have to use multiple entries to perform the mapping. */ if (cpu_addr > 0) { unsigned long nr_zeros = __ffs64(cpu_addr); u64 alignment = 1ULL << nr_zeros; size = min(range->size, alignment); } else { size = range->size; } /* Hardware supports max 4GiB inbound region */ size = min(size, 1ULL << 32); mask = roundup_pow_of_two(size) - 1; mask &= ~0xf; while (cpu_addr < cpu_end) { /* * Set up 64-bit inbound regions as the range parser doesn't * distinguish between 32 and 64-bit types. */ pci_write_reg(pcie, lower_32_bits(pci_addr), PCIEPRAR(idx)); pci_write_reg(pcie, lower_32_bits(cpu_addr), PCIELAR(idx)); pci_write_reg(pcie, lower_32_bits(mask) | flags, PCIELAMR(idx)); pci_write_reg(pcie, upper_32_bits(pci_addr), PCIEPRAR(idx+1)); pci_write_reg(pcie, upper_32_bits(cpu_addr), PCIELAR(idx+1)); pci_write_reg(pcie, 0, PCIELAMR(idx+1)); pci_addr += size; cpu_addr += size; idx += 2; if (idx > MAX_NR_INBOUND_MAPS) { dev_err(pcie->dev, "Failed to map inbound regions!\n"); return -EINVAL; } } *index = idx; return 0; } static int pci_dma_range_parser_init(struct of_pci_range_parser *parser, struct device_node *node) { const int na = 3, ns = 2; int rlen; parser->node = node; parser->pna = of_n_addr_cells(node); parser->np = parser->pna + na + ns; parser->range = of_get_property(node, "dma-ranges", &rlen); if (!parser->range) return -ENOENT; parser->end = parser->range + rlen / sizeof(__be32); return 0; } static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie *pcie, struct device_node *np) { struct of_pci_range range; struct of_pci_range_parser parser; int index = 0; int err; if (pci_dma_range_parser_init(&parser, np)) return -EINVAL; /* Get the dma-ranges from DT */ for_each_of_pci_range(&parser, &range) { u64 end = range.cpu_addr + range.size - 1; dev_dbg(pcie->dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n", range.flags, range.cpu_addr, end, range.pci_addr); err = rcar_pcie_inbound_ranges(pcie, &range, &index); if (err) return err; } return 0; } static const struct of_device_id rcar_pcie_of_match[] = { { .compatible = "renesas,pcie-r8a7779", .data = rcar_pcie_hw_init_h1 }, { .compatible = "renesas,pcie-r8a7790", .data = rcar_pcie_hw_init }, { .compatible = "renesas,pcie-r8a7791", .data = rcar_pcie_hw_init }, {}, }; MODULE_DEVICE_TABLE(of, rcar_pcie_of_match); static int rcar_pcie_probe(struct platform_device *pdev) { struct rcar_pcie *pcie; unsigned int data; struct of_pci_range range; struct of_pci_range_parser parser; const struct of_device_id *of_id; int err, win = 0; int (*hw_init_fn)(struct rcar_pcie *); pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL); if (!pcie) return -ENOMEM; pcie->dev = &pdev->dev; platform_set_drvdata(pdev, pcie); /* Get the bus range */ if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) { dev_err(&pdev->dev, "failed to parse bus-range property\n"); return -EINVAL; } if (of_pci_range_parser_init(&parser, pdev->dev.of_node)) { dev_err(&pdev->dev, "missing ranges property\n"); return -EINVAL; } err = rcar_pcie_get_resources(pdev, pcie); if (err < 0) { dev_err(&pdev->dev, "failed to request resources: %d\n", err); return err; } for_each_of_pci_range(&parser, &range) { of_pci_range_to_resource(&range, pdev->dev.of_node, &pcie->res[win++]); if (win > PCI_MAX_RESOURCES) break; } err = rcar_pcie_parse_map_dma_ranges(pcie, pdev->dev.of_node); if (err) return err; of_id = of_match_device(rcar_pcie_of_match, pcie->dev); if (!of_id || !of_id->data) return -EINVAL; hw_init_fn = of_id->data; /* Failure to get a link might just be that no cards are inserted */ err = hw_init_fn(pcie); if (err) { dev_info(&pdev->dev, "PCIe link down\n"); return 0; } data = pci_read_reg(pcie, MACSR); dev_info(&pdev->dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f); rcar_pcie_enable(pcie); return 0; } static struct platform_driver rcar_pcie_driver = { .driver = { .name = DRV_NAME, .owner = THIS_MODULE, .of_match_table = rcar_pcie_of_match, .suppress_bind_attrs = true, }, .probe = rcar_pcie_probe, }; module_platform_driver(rcar_pcie_driver); MODULE_AUTHOR("Phil Edworthy "); MODULE_DESCRIPTION("Renesas R-Car PCIe driver"); MODULE_LICENSE("GPLv2");