/* * PCI-E support for CNS3xxx * * Copyright 2008 Cavium Networks * Richard Liu * Copyright 2010 MontaVista Software, LLC. * Anton Vorontsov * * This file is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, Version 2, as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include "core.h" enum cns3xxx_access_type { CNS3XXX_HOST_TYPE = 0, CNS3XXX_CFG0_TYPE, CNS3XXX_CFG1_TYPE, CNS3XXX_NUM_ACCESS_TYPES, }; struct cns3xxx_pcie { struct map_desc cfg_bases[CNS3XXX_NUM_ACCESS_TYPES]; unsigned int irqs[2]; struct resource res_io; struct resource res_mem; struct hw_pci hw_pci; bool linked; }; static struct cns3xxx_pcie cns3xxx_pcie[]; /* forward decl. */ static struct cns3xxx_pcie *sysdata_to_cnspci(void *sysdata) { struct pci_sys_data *root = sysdata; return &cns3xxx_pcie[root->domain]; } static struct cns3xxx_pcie *pdev_to_cnspci(const struct pci_dev *dev) { return sysdata_to_cnspci(dev->sysdata); } static struct cns3xxx_pcie *pbus_to_cnspci(struct pci_bus *bus) { return sysdata_to_cnspci(bus->sysdata); } static void __iomem *cns3xxx_pci_cfg_base(struct pci_bus *bus, unsigned int devfn, int where) { struct cns3xxx_pcie *cnspci = pbus_to_cnspci(bus); int busno = bus->number; int slot = PCI_SLOT(devfn); int offset; enum cns3xxx_access_type type; void __iomem *base; /* If there is no link, just show the CNS PCI bridge. */ if (!cnspci->linked && (busno > 0 || slot > 0)) return NULL; /* * The CNS PCI bridge doesn't fit into the PCI hierarchy, though * we still want to access it. For this to work, we must place * the first device on the same bus as the CNS PCI bridge. */ if (busno == 0) { if (slot > 1) return NULL; type = slot; } else { type = CNS3XXX_CFG1_TYPE; } base = (void __iomem *)cnspci->cfg_bases[type].virtual; offset = ((busno & 0xf) << 20) | (devfn << 12) | (where & 0xffc); return base + offset; } static int cns3xxx_pci_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { u32 v; void __iomem *base; u32 mask = (0x1ull << (size * 8)) - 1; int shift = (where % 4) * 8; base = cns3xxx_pci_cfg_base(bus, devfn, where); if (!base) { *val = 0xffffffff; return PCIBIOS_SUCCESSFUL; } v = __raw_readl(base); if (bus->number == 0 && devfn == 0 && (where & 0xffc) == PCI_CLASS_REVISION) { /* * RC's class is 0xb, but Linux PCI driver needs 0x604 * for a PCIe bridge. So we must fixup the class code * to 0x604 here. */ v &= 0xff; v |= 0x604 << 16; } *val = (v >> shift) & mask; return PCIBIOS_SUCCESSFUL; } static int cns3xxx_pci_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { u32 v; void __iomem *base; u32 mask = (0x1ull << (size * 8)) - 1; int shift = (where % 4) * 8; base = cns3xxx_pci_cfg_base(bus, devfn, where); if (!base) return PCIBIOS_SUCCESSFUL; v = __raw_readl(base); v &= ~(mask << shift); v |= (val & mask) << shift; __raw_writel(v, base); return PCIBIOS_SUCCESSFUL; } static int cns3xxx_pci_setup(int nr, struct pci_sys_data *sys) { struct cns3xxx_pcie *cnspci = sysdata_to_cnspci(sys); struct resource *res_io = &cnspci->res_io; struct resource *res_mem = &cnspci->res_mem; BUG_ON(request_resource(&iomem_resource, res_io) || request_resource(&iomem_resource, res_mem)); pci_add_resource_offset(&sys->resources, res_io, sys->io_offset); pci_add_resource_offset(&sys->resources, res_mem, sys->mem_offset); return 1; } static struct pci_ops cns3xxx_pcie_ops = { .read = cns3xxx_pci_read_config, .write = cns3xxx_pci_write_config, }; static struct pci_bus *cns3xxx_pci_scan_bus(int nr, struct pci_sys_data *sys) { return pci_scan_root_bus(NULL, sys->busnr, &cns3xxx_pcie_ops, sys, &sys->resources); } static int cns3xxx_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) { struct cns3xxx_pcie *cnspci = pdev_to_cnspci(dev); int irq = cnspci->irqs[slot]; pr_info("PCIe map irq: %04d:%02x:%02x.%02x slot %d, pin %d, irq: %d\n", pci_domain_nr(dev->bus), dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), slot, pin, irq); return irq; } static struct cns3xxx_pcie cns3xxx_pcie[] = { [0] = { .cfg_bases = { [CNS3XXX_HOST_TYPE] = { .virtual = CNS3XXX_PCIE0_HOST_BASE_VIRT, .pfn = __phys_to_pfn(CNS3XXX_PCIE0_HOST_BASE), .length = SZ_16M, .type = MT_DEVICE, }, [CNS3XXX_CFG0_TYPE] = { .virtual = CNS3XXX_PCIE0_CFG0_BASE_VIRT, .pfn = __phys_to_pfn(CNS3XXX_PCIE0_CFG0_BASE), .length = SZ_16M, .type = MT_DEVICE, }, [CNS3XXX_CFG1_TYPE] = { .virtual = CNS3XXX_PCIE0_CFG1_BASE_VIRT, .pfn = __phys_to_pfn(CNS3XXX_PCIE0_CFG1_BASE), .length = SZ_16M, .type = MT_DEVICE, }, }, .res_io = { .name = "PCIe0 I/O space", .start = CNS3XXX_PCIE0_IO_BASE, .end = CNS3XXX_PCIE0_IO_BASE + SZ_16M - 1, .flags = IORESOURCE_IO, }, .res_mem = { .name = "PCIe0 non-prefetchable", .start = CNS3XXX_PCIE0_MEM_BASE, .end = CNS3XXX_PCIE0_MEM_BASE + SZ_16M - 1, .flags = IORESOURCE_MEM, }, .irqs = { IRQ_CNS3XXX_PCIE0_RC, IRQ_CNS3XXX_PCIE0_DEVICE, }, .hw_pci = { .domain = 0, .nr_controllers = 1, .setup = cns3xxx_pci_setup, .scan = cns3xxx_pci_scan_bus, .map_irq = cns3xxx_pcie_map_irq, }, }, [1] = { .cfg_bases = { [CNS3XXX_HOST_TYPE] = { .virtual = CNS3XXX_PCIE1_HOST_BASE_VIRT, .pfn = __phys_to_pfn(CNS3XXX_PCIE1_HOST_BASE), .length = SZ_16M, .type = MT_DEVICE, }, [CNS3XXX_CFG0_TYPE] = { .virtual = CNS3XXX_PCIE1_CFG0_BASE_VIRT, .pfn = __phys_to_pfn(CNS3XXX_PCIE1_CFG0_BASE), .length = SZ_16M, .type = MT_DEVICE, }, [CNS3XXX_CFG1_TYPE] = { .virtual = CNS3XXX_PCIE1_CFG1_BASE_VIRT, .pfn = __phys_to_pfn(CNS3XXX_PCIE1_CFG1_BASE), .length = SZ_16M, .type = MT_DEVICE, }, }, .res_io = { .name = "PCIe1 I/O space", .start = CNS3XXX_PCIE1_IO_BASE, .end = CNS3XXX_PCIE1_IO_BASE + SZ_16M - 1, .flags = IORESOURCE_IO, }, .res_mem = { .name = "PCIe1 non-prefetchable", .start = CNS3XXX_PCIE1_MEM_BASE, .end = CNS3XXX_PCIE1_MEM_BASE + SZ_16M - 1, .flags = IORESOURCE_MEM, }, .irqs = { IRQ_CNS3XXX_PCIE1_RC, IRQ_CNS3XXX_PCIE1_DEVICE, }, .hw_pci = { .domain = 1, .nr_controllers = 1, .setup = cns3xxx_pci_setup, .scan = cns3xxx_pci_scan_bus, .map_irq = cns3xxx_pcie_map_irq, }, }, }; static void __init cns3xxx_pcie_check_link(struct cns3xxx_pcie *cnspci) { int port = cnspci->hw_pci.domain; u32 reg; unsigned long time; reg = __raw_readl(MISC_PCIE_CTRL(port)); /* * Enable Application Request to 1, it will exit L1 automatically, * but when chip back, it will use another clock, still can use 0x1. */ reg |= 0x3; __raw_writel(reg, MISC_PCIE_CTRL(port)); pr_info("PCIe: Port[%d] Enable PCIe LTSSM\n", port); pr_info("PCIe: Port[%d] Check data link layer...", port); time = jiffies; while (1) { reg = __raw_readl(MISC_PCIE_PM_DEBUG(port)); if (reg & 0x1) { pr_info("Link up.\n"); cnspci->linked = 1; break; } else if (time_after(jiffies, time + 50)) { pr_info("Device not found.\n"); break; } } } static void __init cns3xxx_pcie_hw_init(struct cns3xxx_pcie *cnspci) { int port = cnspci->hw_pci.domain; struct pci_sys_data sd = { .domain = port, }; struct pci_bus bus = { .number = 0, .ops = &cns3xxx_pcie_ops, .sysdata = &sd, }; u32 io_base = cnspci->res_io.start >> 16; u32 mem_base = cnspci->res_mem.start >> 16; u32 host_base = cnspci->cfg_bases[CNS3XXX_HOST_TYPE].pfn; u32 cfg0_base = cnspci->cfg_bases[CNS3XXX_CFG0_TYPE].pfn; u32 devfn = 0; u8 tmp8; u16 pos; u16 dc; host_base = (__pfn_to_phys(host_base) - 1) >> 16; cfg0_base = (__pfn_to_phys(cfg0_base) - 1) >> 16; pci_bus_write_config_byte(&bus, devfn, PCI_PRIMARY_BUS, 0); pci_bus_write_config_byte(&bus, devfn, PCI_SECONDARY_BUS, 1); pci_bus_write_config_byte(&bus, devfn, PCI_SUBORDINATE_BUS, 1); pci_bus_read_config_byte(&bus, devfn, PCI_PRIMARY_BUS, &tmp8); pci_bus_read_config_byte(&bus, devfn, PCI_SECONDARY_BUS, &tmp8); pci_bus_read_config_byte(&bus, devfn, PCI_SUBORDINATE_BUS, &tmp8); pci_bus_write_config_word(&bus, devfn, PCI_MEMORY_BASE, mem_base); pci_bus_write_config_word(&bus, devfn, PCI_MEMORY_LIMIT, host_base); pci_bus_write_config_word(&bus, devfn, PCI_IO_BASE_UPPER16, io_base); pci_bus_write_config_word(&bus, devfn, PCI_IO_LIMIT_UPPER16, cfg0_base); if (!cnspci->linked) return; /* Set Device Max_Read_Request_Size to 128 byte */ devfn = PCI_DEVFN(1, 0); pos = pci_bus_find_capability(&bus, devfn, PCI_CAP_ID_EXP); pci_bus_read_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, &dc); dc &= ~(0x3 << 12); /* Clear Device Control Register [14:12] */ pci_bus_write_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, dc); pci_bus_read_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, &dc); if (!(dc & (0x3 << 12))) pr_info("PCIe: Set Device Max_Read_Request_Size to 128 byte\n"); /* Disable PCIe0 Interrupt Mask INTA to INTD */ __raw_writel(~0x3FFF, MISC_PCIE_INT_MASK(port)); } static int cns3xxx_pcie_abort_handler(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { if (fsr & (1 << 10)) regs->ARM_pc += 4; return 0; } static int __init cns3xxx_pcie_init(void) { int i; pcibios_min_io = 0; pcibios_min_mem = 0; hook_fault_code(16 + 6, cns3xxx_pcie_abort_handler, SIGBUS, 0, "imprecise external abort"); for (i = 0; i < ARRAY_SIZE(cns3xxx_pcie); i++) { iotable_init(cns3xxx_pcie[i].cfg_bases, ARRAY_SIZE(cns3xxx_pcie[i].cfg_bases)); cns3xxx_pwr_clk_en(0x1 << PM_CLK_GATE_REG_OFFSET_PCIE(i)); cns3xxx_pwr_soft_rst(0x1 << PM_SOFT_RST_REG_OFFST_PCIE(i)); cns3xxx_pcie_check_link(&cns3xxx_pcie[i]); cns3xxx_pcie_hw_init(&cns3xxx_pcie[i]); pci_common_init(&cns3xxx_pcie[i].hw_pci); } pci_assign_unassigned_resources(); return 0; } device_initcall(cns3xxx_pcie_init);