diff options
author | Rusty Russell <rusty@rustcorp.com.au> | 2008-12-31 23:05:57 +1030 |
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committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-12-31 23:05:57 +1030 |
commit | 2ca1a615835d9f4990f42102ab1f2ef434e7e89c (patch) | |
tree | 726cf3d5f29a6c66c44e4bd68e7ebed2fd83d059 /arch/sparc/kernel/pci_common.c | |
parent | e12f0102ac81d660c9f801d0a0e10ccf4537a9de (diff) | |
parent | 6a94cb73064c952255336cc57731904174b2c58f (diff) |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
arch/x86/kernel/io_apic.c
Diffstat (limited to 'arch/sparc/kernel/pci_common.c')
-rw-r--r-- | arch/sparc/kernel/pci_common.c | 545 |
1 files changed, 545 insertions, 0 deletions
diff --git a/arch/sparc/kernel/pci_common.c b/arch/sparc/kernel/pci_common.c new file mode 100644 index 00000000000..23b88082d0b --- /dev/null +++ b/arch/sparc/kernel/pci_common.c @@ -0,0 +1,545 @@ +/* pci_common.c: PCI controller common support. + * + * Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net) + */ + +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/device.h> +#include <linux/of_device.h> + +#include <asm/prom.h> +#include <asm/oplib.h> + +#include "pci_impl.h" +#include "pci_sun4v.h" + +static int config_out_of_range(struct pci_pbm_info *pbm, + unsigned long bus, + unsigned long devfn, + unsigned long reg) +{ + if (bus < pbm->pci_first_busno || + bus > pbm->pci_last_busno) + return 1; + return 0; +} + +static void *sun4u_config_mkaddr(struct pci_pbm_info *pbm, + unsigned long bus, + unsigned long devfn, + unsigned long reg) +{ + unsigned long rbits = pbm->config_space_reg_bits; + + if (config_out_of_range(pbm, bus, devfn, reg)) + return NULL; + + reg = (reg & ((1 << rbits) - 1)); + devfn <<= rbits; + bus <<= rbits + 8; + + return (void *) (pbm->config_space | bus | devfn | reg); +} + +/* At least on Sabre, it is necessary to access all PCI host controller + * registers at their natural size, otherwise zeros are returned. + * Strange but true, and I see no language in the UltraSPARC-IIi + * programmer's manual that mentions this even indirectly. + */ +static int sun4u_read_pci_cfg_host(struct pci_pbm_info *pbm, + unsigned char bus, unsigned int devfn, + int where, int size, u32 *value) +{ + u32 tmp32, *addr; + u16 tmp16; + u8 tmp8; + + addr = sun4u_config_mkaddr(pbm, bus, devfn, where); + if (!addr) + return PCIBIOS_SUCCESSFUL; + + switch (size) { + case 1: + if (where < 8) { + unsigned long align = (unsigned long) addr; + + align &= ~1; + pci_config_read16((u16 *)align, &tmp16); + if (where & 1) + *value = tmp16 >> 8; + else + *value = tmp16 & 0xff; + } else { + pci_config_read8((u8 *)addr, &tmp8); + *value = (u32) tmp8; + } + break; + + case 2: + if (where < 8) { + pci_config_read16((u16 *)addr, &tmp16); + *value = (u32) tmp16; + } else { + pci_config_read8((u8 *)addr, &tmp8); + *value = (u32) tmp8; + pci_config_read8(((u8 *)addr) + 1, &tmp8); + *value |= ((u32) tmp8) << 8; + } + break; + + case 4: + tmp32 = 0xffffffff; + sun4u_read_pci_cfg_host(pbm, bus, devfn, + where, 2, &tmp32); + *value = tmp32; + + tmp32 = 0xffffffff; + sun4u_read_pci_cfg_host(pbm, bus, devfn, + where + 2, 2, &tmp32); + *value |= tmp32 << 16; + break; + } + return PCIBIOS_SUCCESSFUL; +} + +static int sun4u_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn, + int where, int size, u32 *value) +{ + struct pci_pbm_info *pbm = bus_dev->sysdata; + unsigned char bus = bus_dev->number; + u32 *addr; + u16 tmp16; + u8 tmp8; + + switch (size) { + case 1: + *value = 0xff; + break; + case 2: + *value = 0xffff; + break; + case 4: + *value = 0xffffffff; + break; + } + + if (!bus_dev->number && !PCI_SLOT(devfn)) + return sun4u_read_pci_cfg_host(pbm, bus, devfn, where, + size, value); + + addr = sun4u_config_mkaddr(pbm, bus, devfn, where); + if (!addr) + return PCIBIOS_SUCCESSFUL; + + switch (size) { + case 1: + pci_config_read8((u8 *)addr, &tmp8); + *value = (u32) tmp8; + break; + + case 2: + if (where & 0x01) { + printk("pci_read_config_word: misaligned reg [%x]\n", + where); + return PCIBIOS_SUCCESSFUL; + } + pci_config_read16((u16 *)addr, &tmp16); + *value = (u32) tmp16; + break; + + case 4: + if (where & 0x03) { + printk("pci_read_config_dword: misaligned reg [%x]\n", + where); + return PCIBIOS_SUCCESSFUL; + } + pci_config_read32(addr, value); + break; + } + return PCIBIOS_SUCCESSFUL; +} + +static int sun4u_write_pci_cfg_host(struct pci_pbm_info *pbm, + unsigned char bus, unsigned int devfn, + int where, int size, u32 value) +{ + u32 *addr; + + addr = sun4u_config_mkaddr(pbm, bus, devfn, where); + if (!addr) + return PCIBIOS_SUCCESSFUL; + + switch (size) { + case 1: + if (where < 8) { + unsigned long align = (unsigned long) addr; + u16 tmp16; + + align &= ~1; + pci_config_read16((u16 *)align, &tmp16); + if (where & 1) { + tmp16 &= 0x00ff; + tmp16 |= value << 8; + } else { + tmp16 &= 0xff00; + tmp16 |= value; + } + pci_config_write16((u16 *)align, tmp16); + } else + pci_config_write8((u8 *)addr, value); + break; + case 2: + if (where < 8) { + pci_config_write16((u16 *)addr, value); + } else { + pci_config_write8((u8 *)addr, value & 0xff); + pci_config_write8(((u8 *)addr) + 1, value >> 8); + } + break; + case 4: + sun4u_write_pci_cfg_host(pbm, bus, devfn, + where, 2, value & 0xffff); + sun4u_write_pci_cfg_host(pbm, bus, devfn, + where + 2, 2, value >> 16); + break; + } + return PCIBIOS_SUCCESSFUL; +} + +static int sun4u_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn, + int where, int size, u32 value) +{ + struct pci_pbm_info *pbm = bus_dev->sysdata; + unsigned char bus = bus_dev->number; + u32 *addr; + + if (!bus_dev->number && !PCI_SLOT(devfn)) + return sun4u_write_pci_cfg_host(pbm, bus, devfn, where, + size, value); + + addr = sun4u_config_mkaddr(pbm, bus, devfn, where); + if (!addr) + return PCIBIOS_SUCCESSFUL; + + switch (size) { + case 1: + pci_config_write8((u8 *)addr, value); + break; + + case 2: + if (where & 0x01) { + printk("pci_write_config_word: misaligned reg [%x]\n", + where); + return PCIBIOS_SUCCESSFUL; + } + pci_config_write16((u16 *)addr, value); + break; + + case 4: + if (where & 0x03) { + printk("pci_write_config_dword: misaligned reg [%x]\n", + where); + return PCIBIOS_SUCCESSFUL; + } + pci_config_write32(addr, value); + } + return PCIBIOS_SUCCESSFUL; +} + +struct pci_ops sun4u_pci_ops = { + .read = sun4u_read_pci_cfg, + .write = sun4u_write_pci_cfg, +}; + +static int sun4v_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn, + int where, int size, u32 *value) +{ + struct pci_pbm_info *pbm = bus_dev->sysdata; + u32 devhandle = pbm->devhandle; + unsigned int bus = bus_dev->number; + unsigned int device = PCI_SLOT(devfn); + unsigned int func = PCI_FUNC(devfn); + unsigned long ret; + + if (config_out_of_range(pbm, bus, devfn, where)) { + ret = ~0UL; + } else { + ret = pci_sun4v_config_get(devhandle, + HV_PCI_DEVICE_BUILD(bus, device, func), + where, size); + } + switch (size) { + case 1: + *value = ret & 0xff; + break; + case 2: + *value = ret & 0xffff; + break; + case 4: + *value = ret & 0xffffffff; + break; + }; + + + return PCIBIOS_SUCCESSFUL; +} + +static int sun4v_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn, + int where, int size, u32 value) +{ + struct pci_pbm_info *pbm = bus_dev->sysdata; + u32 devhandle = pbm->devhandle; + unsigned int bus = bus_dev->number; + unsigned int device = PCI_SLOT(devfn); + unsigned int func = PCI_FUNC(devfn); + unsigned long ret; + + if (config_out_of_range(pbm, bus, devfn, where)) { + /* Do nothing. */ + } else { + ret = pci_sun4v_config_put(devhandle, + HV_PCI_DEVICE_BUILD(bus, device, func), + where, size, value); + } + return PCIBIOS_SUCCESSFUL; +} + +struct pci_ops sun4v_pci_ops = { + .read = sun4v_read_pci_cfg, + .write = sun4v_write_pci_cfg, +}; + +void pci_get_pbm_props(struct pci_pbm_info *pbm) +{ + const u32 *val = of_get_property(pbm->op->node, "bus-range", NULL); + + pbm->pci_first_busno = val[0]; + pbm->pci_last_busno = val[1]; + + val = of_get_property(pbm->op->node, "ino-bitmap", NULL); + if (val) { + pbm->ino_bitmap = (((u64)val[1] << 32UL) | + ((u64)val[0] << 0UL)); + } +} + +static void pci_register_legacy_regions(struct resource *io_res, + struct resource *mem_res) +{ + struct resource *p; + + /* VGA Video RAM. */ + p = kzalloc(sizeof(*p), GFP_KERNEL); + if (!p) + return; + + p->name = "Video RAM area"; + p->start = mem_res->start + 0xa0000UL; + p->end = p->start + 0x1ffffUL; + p->flags = IORESOURCE_BUSY; + request_resource(mem_res, p); + + p = kzalloc(sizeof(*p), GFP_KERNEL); + if (!p) + return; + + p->name = "System ROM"; + p->start = mem_res->start + 0xf0000UL; + p->end = p->start + 0xffffUL; + p->flags = IORESOURCE_BUSY; + request_resource(mem_res, p); + + p = kzalloc(sizeof(*p), GFP_KERNEL); + if (!p) + return; + + p->name = "Video ROM"; + p->start = mem_res->start + 0xc0000UL; + p->end = p->start + 0x7fffUL; + p->flags = IORESOURCE_BUSY; + request_resource(mem_res, p); +} + +static void pci_register_iommu_region(struct pci_pbm_info *pbm) +{ + const u32 *vdma = of_get_property(pbm->op->node, "virtual-dma", NULL); + + if (vdma) { + struct resource *rp = kmalloc(sizeof(*rp), GFP_KERNEL); + + if (!rp) { + prom_printf("Cannot allocate IOMMU resource.\n"); + prom_halt(); + } + rp->name = "IOMMU"; + rp->start = pbm->mem_space.start + (unsigned long) vdma[0]; + rp->end = rp->start + (unsigned long) vdma[1] - 1UL; + rp->flags = IORESOURCE_BUSY; + request_resource(&pbm->mem_space, rp); + } +} + +void pci_determine_mem_io_space(struct pci_pbm_info *pbm) +{ + const struct linux_prom_pci_ranges *pbm_ranges; + int i, saw_mem, saw_io; + int num_pbm_ranges; + + saw_mem = saw_io = 0; + pbm_ranges = of_get_property(pbm->op->node, "ranges", &i); + if (!pbm_ranges) { + prom_printf("PCI: Fatal error, missing PBM ranges property " + " for %s\n", + pbm->name); + prom_halt(); + } + + num_pbm_ranges = i / sizeof(*pbm_ranges); + + for (i = 0; i < num_pbm_ranges; i++) { + const struct linux_prom_pci_ranges *pr = &pbm_ranges[i]; + unsigned long a, size; + u32 parent_phys_hi, parent_phys_lo; + u32 size_hi, size_lo; + int type; + + parent_phys_hi = pr->parent_phys_hi; + parent_phys_lo = pr->parent_phys_lo; + if (tlb_type == hypervisor) + parent_phys_hi &= 0x0fffffff; + + size_hi = pr->size_hi; + size_lo = pr->size_lo; + + type = (pr->child_phys_hi >> 24) & 0x3; + a = (((unsigned long)parent_phys_hi << 32UL) | + ((unsigned long)parent_phys_lo << 0UL)); + size = (((unsigned long)size_hi << 32UL) | + ((unsigned long)size_lo << 0UL)); + + switch (type) { + case 0: + /* PCI config space, 16MB */ + pbm->config_space = a; + break; + + case 1: + /* 16-bit IO space, 16MB */ + pbm->io_space.start = a; + pbm->io_space.end = a + size - 1UL; + pbm->io_space.flags = IORESOURCE_IO; + saw_io = 1; + break; + + case 2: + /* 32-bit MEM space, 2GB */ + pbm->mem_space.start = a; + pbm->mem_space.end = a + size - 1UL; + pbm->mem_space.flags = IORESOURCE_MEM; + saw_mem = 1; + break; + + case 3: + /* XXX 64-bit MEM handling XXX */ + + default: + break; + }; + } + + if (!saw_io || !saw_mem) { + prom_printf("%s: Fatal error, missing %s PBM range.\n", + pbm->name, + (!saw_io ? "IO" : "MEM")); + prom_halt(); + } + + printk("%s: PCI IO[%lx] MEM[%lx]\n", + pbm->name, + pbm->io_space.start, + pbm->mem_space.start); + + pbm->io_space.name = pbm->mem_space.name = pbm->name; + + request_resource(&ioport_resource, &pbm->io_space); + request_resource(&iomem_resource, &pbm->mem_space); + + pci_register_legacy_regions(&pbm->io_space, + &pbm->mem_space); + pci_register_iommu_region(pbm); +} + +/* Generic helper routines for PCI error reporting. */ +void pci_scan_for_target_abort(struct pci_pbm_info *pbm, + struct pci_bus *pbus) +{ + struct pci_dev *pdev; + struct pci_bus *bus; + + list_for_each_entry(pdev, &pbus->devices, bus_list) { + u16 status, error_bits; + + pci_read_config_word(pdev, PCI_STATUS, &status); + error_bits = + (status & (PCI_STATUS_SIG_TARGET_ABORT | + PCI_STATUS_REC_TARGET_ABORT)); + if (error_bits) { + pci_write_config_word(pdev, PCI_STATUS, error_bits); + printk("%s: Device %s saw Target Abort [%016x]\n", + pbm->name, pci_name(pdev), status); + } + } + + list_for_each_entry(bus, &pbus->children, node) + pci_scan_for_target_abort(pbm, bus); +} + +void pci_scan_for_master_abort(struct pci_pbm_info *pbm, + struct pci_bus *pbus) +{ + struct pci_dev *pdev; + struct pci_bus *bus; + + list_for_each_entry(pdev, &pbus->devices, bus_list) { + u16 status, error_bits; + + pci_read_config_word(pdev, PCI_STATUS, &status); + error_bits = + (status & (PCI_STATUS_REC_MASTER_ABORT)); + if (error_bits) { + pci_write_config_word(pdev, PCI_STATUS, error_bits); + printk("%s: Device %s received Master Abort [%016x]\n", + pbm->name, pci_name(pdev), status); + } + } + + list_for_each_entry(bus, &pbus->children, node) + pci_scan_for_master_abort(pbm, bus); +} + +void pci_scan_for_parity_error(struct pci_pbm_info *pbm, + struct pci_bus *pbus) +{ + struct pci_dev *pdev; + struct pci_bus *bus; + + list_for_each_entry(pdev, &pbus->devices, bus_list) { + u16 status, error_bits; + + pci_read_config_word(pdev, PCI_STATUS, &status); + error_bits = + (status & (PCI_STATUS_PARITY | + PCI_STATUS_DETECTED_PARITY)); + if (error_bits) { + pci_write_config_word(pdev, PCI_STATUS, error_bits); + printk("%s: Device %s saw Parity Error [%016x]\n", + pbm->name, pci_name(pdev), status); + } + } + + list_for_each_entry(bus, &pbus->children, node) + pci_scan_for_parity_error(pbm, bus); +} |