ia64/linux-2.6.18-xen.hg

annotate drivers/pci/rom.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents 831230e53067
children
rev   line source
ian@0 1 /*
ian@0 2 * drivers/pci/rom.c
ian@0 3 *
ian@0 4 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
ian@0 5 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
ian@0 6 *
ian@0 7 * PCI ROM access routines
ian@0 8 */
ian@0 9 #include <linux/kernel.h>
ian@0 10 #include <linux/pci.h>
ian@0 11 #include <linux/slab.h>
ian@0 12
ian@0 13 #include "pci.h"
ian@0 14
ian@0 15 /**
ian@0 16 * pci_enable_rom - enable ROM decoding for a PCI device
ian@0 17 * @pdev: PCI device to enable
ian@0 18 *
ian@0 19 * Enable ROM decoding on @dev. This involves simply turning on the last
ian@0 20 * bit of the PCI ROM BAR. Note that some cards may share address decoders
ian@0 21 * between the ROM and other resources, so enabling it may disable access
ian@0 22 * to MMIO registers or other card memory.
ian@0 23 */
ian@0 24 static int pci_enable_rom(struct pci_dev *pdev)
ian@0 25 {
ian@0 26 struct resource *res = pdev->resource + PCI_ROM_RESOURCE;
ian@0 27 struct pci_bus_region region;
ian@0 28 u32 rom_addr;
ian@0 29
ian@0 30 if (!res->flags)
ian@0 31 return -1;
ian@0 32
ian@0 33 pcibios_resource_to_bus(pdev, &region, res);
ian@0 34 pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
ian@0 35 rom_addr &= ~PCI_ROM_ADDRESS_MASK;
ian@0 36 rom_addr |= region.start | PCI_ROM_ADDRESS_ENABLE;
ian@0 37 pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
ian@0 38 return 0;
ian@0 39 }
ian@0 40
ian@0 41 /**
ian@0 42 * pci_disable_rom - disable ROM decoding for a PCI device
ian@0 43 * @pdev: PCI device to disable
ian@0 44 *
ian@0 45 * Disable ROM decoding on a PCI device by turning off the last bit in the
ian@0 46 * ROM BAR.
ian@0 47 */
ian@0 48 static void pci_disable_rom(struct pci_dev *pdev)
ian@0 49 {
ian@0 50 u32 rom_addr;
ian@0 51 pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
ian@0 52 rom_addr &= ~PCI_ROM_ADDRESS_ENABLE;
ian@0 53 pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
ian@0 54 }
ian@0 55
ian@0 56 /**
ian@0 57 * pci_map_rom - map a PCI ROM to kernel space
ian@0 58 * @pdev: pointer to pci device struct
ian@0 59 * @size: pointer to receive size of pci window over ROM
ian@0 60 * @return: kernel virtual pointer to image of ROM
ian@0 61 *
ian@0 62 * Map a PCI ROM into kernel space. If ROM is boot video ROM,
ian@0 63 * the shadow BIOS copy will be returned instead of the
ian@0 64 * actual ROM.
ian@0 65 */
ian@0 66 void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
ian@0 67 {
ian@0 68 struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
ian@0 69 loff_t start;
ian@0 70 void __iomem *rom;
ian@0 71 void __iomem *image;
ian@0 72 int last_image;
ian@0 73
ian@0 74 /* IORESOURCE_ROM_SHADOW only set on x86 */
ian@0 75 if (res->flags & IORESOURCE_ROM_SHADOW) {
ian@0 76 /* primary video rom always starts here */
ian@0 77 start = (loff_t)0xC0000;
ian@0 78 *size = 0x20000; /* cover C000:0 through E000:0 */
ian@0 79 } else {
ian@0 80 if (res->flags & IORESOURCE_ROM_COPY) {
ian@0 81 *size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
ian@0 82 return (void __iomem *)(unsigned long)
ian@0 83 pci_resource_start(pdev, PCI_ROM_RESOURCE);
ian@0 84 } else {
ian@0 85 /* assign the ROM an address if it doesn't have one */
ian@0 86 if (res->parent == NULL &&
ian@0 87 pci_assign_resource(pdev,PCI_ROM_RESOURCE))
ian@0 88 return NULL;
ian@0 89 start = pci_resource_start(pdev, PCI_ROM_RESOURCE);
ian@0 90 *size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
ian@0 91 if (*size == 0)
ian@0 92 return NULL;
ian@0 93
ian@0 94 /* Enable ROM space decodes */
ian@0 95 if (pci_enable_rom(pdev))
ian@0 96 return NULL;
ian@0 97 }
ian@0 98 }
ian@0 99
ian@0 100 rom = ioremap(start, *size);
ian@0 101 if (!rom) {
ian@0 102 /* restore enable if ioremap fails */
ian@0 103 if (!(res->flags & (IORESOURCE_ROM_ENABLE |
ian@0 104 IORESOURCE_ROM_SHADOW |
ian@0 105 IORESOURCE_ROM_COPY)))
ian@0 106 pci_disable_rom(pdev);
ian@0 107 return NULL;
ian@0 108 }
ian@0 109
ian@0 110 /*
ian@0 111 * Try to find the true size of the ROM since sometimes the PCI window
ian@0 112 * size is much larger than the actual size of the ROM.
ian@0 113 * True size is important if the ROM is going to be copied.
ian@0 114 */
ian@0 115 image = rom;
ian@0 116 do {
ian@0 117 void __iomem *pds;
ian@0 118 /* Standard PCI ROMs start out with these bytes 55 AA */
ian@0 119 if (readb(image) != 0x55)
ian@0 120 break;
ian@0 121 if (readb(image + 1) != 0xAA)
ian@0 122 break;
ian@0 123 /* get the PCI data structure and check its signature */
ian@0 124 pds = image + readw(image + 24);
ian@0 125 if (readb(pds) != 'P')
ian@0 126 break;
ian@0 127 if (readb(pds + 1) != 'C')
ian@0 128 break;
ian@0 129 if (readb(pds + 2) != 'I')
ian@0 130 break;
ian@0 131 if (readb(pds + 3) != 'R')
ian@0 132 break;
ian@0 133 last_image = readb(pds + 21) & 0x80;
ian@0 134 /* this length is reliable */
ian@0 135 image += readw(pds + 16) * 512;
ian@0 136 } while (!last_image);
ian@0 137
ian@0 138 /* never return a size larger than the PCI resource window */
ian@0 139 /* there are known ROMs that get the size wrong */
ian@0 140 *size = min((size_t)(image - rom), *size);
ian@0 141
ian@0 142 return rom;
ian@0 143 }
ian@0 144
ian@0 145 /**
ian@0 146 * pci_map_rom_copy - map a PCI ROM to kernel space, create a copy
ian@0 147 * @pdev: pointer to pci device struct
ian@0 148 * @size: pointer to receive size of pci window over ROM
ian@0 149 * @return: kernel virtual pointer to image of ROM
ian@0 150 *
ian@0 151 * Map a PCI ROM into kernel space. If ROM is boot video ROM,
ian@0 152 * the shadow BIOS copy will be returned instead of the
ian@0 153 * actual ROM.
ian@0 154 */
ian@0 155 void __iomem *pci_map_rom_copy(struct pci_dev *pdev, size_t *size)
ian@0 156 {
ian@0 157 struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
ian@0 158 void __iomem *rom;
ian@0 159
ian@0 160 rom = pci_map_rom(pdev, size);
ian@0 161 if (!rom)
ian@0 162 return NULL;
ian@0 163
ian@0 164 if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_SHADOW))
ian@0 165 return rom;
ian@0 166
ian@0 167 res->start = (unsigned long)kmalloc(*size, GFP_KERNEL);
ian@0 168 if (!res->start)
ian@0 169 return rom;
ian@0 170
ian@0 171 res->end = res->start + *size;
ian@0 172 memcpy_fromio((void*)(unsigned long)res->start, rom, *size);
ian@0 173 pci_unmap_rom(pdev, rom);
ian@0 174 res->flags |= IORESOURCE_ROM_COPY;
ian@0 175
ian@0 176 return (void __iomem *)(unsigned long)res->start;
ian@0 177 }
ian@0 178
ian@0 179 /**
ian@0 180 * pci_unmap_rom - unmap the ROM from kernel space
ian@0 181 * @pdev: pointer to pci device struct
ian@0 182 * @rom: virtual address of the previous mapping
ian@0 183 *
ian@0 184 * Remove a mapping of a previously mapped ROM
ian@0 185 */
ian@0 186 void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom)
ian@0 187 {
ian@0 188 struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
ian@0 189
ian@0 190 if (res->flags & IORESOURCE_ROM_COPY)
ian@0 191 return;
ian@0 192
ian@0 193 iounmap(rom);
ian@0 194
ian@0 195 /* Disable again before continuing, leave enabled if pci=rom */
ian@0 196 if (!(res->flags & (IORESOURCE_ROM_ENABLE | IORESOURCE_ROM_SHADOW)))
ian@0 197 pci_disable_rom(pdev);
ian@0 198 }
ian@0 199
ian@0 200 /**
ian@0 201 * pci_remove_rom - disable the ROM and remove its sysfs attribute
ian@0 202 * @pdev: pointer to pci device struct
ian@0 203 *
ian@0 204 * Remove the rom file in sysfs and disable ROM decoding.
ian@0 205 */
ian@0 206 void pci_remove_rom(struct pci_dev *pdev)
ian@0 207 {
ian@0 208 struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
ian@0 209
ian@0 210 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
ian@0 211 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
ian@0 212 if (!(res->flags & (IORESOURCE_ROM_ENABLE |
ian@0 213 IORESOURCE_ROM_SHADOW |
ian@0 214 IORESOURCE_ROM_COPY)))
ian@0 215 pci_disable_rom(pdev);
ian@0 216 }
ian@0 217
ian@0 218 /**
ian@0 219 * pci_cleanup_rom - internal routine for freeing the ROM copy created
ian@0 220 * by pci_map_rom_copy called from remove.c
ian@0 221 * @pdev: pointer to pci device struct
ian@0 222 *
ian@0 223 * Free the copied ROM if we allocated one.
ian@0 224 */
ian@0 225 void pci_cleanup_rom(struct pci_dev *pdev)
ian@0 226 {
ian@0 227 struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
ian@0 228 if (res->flags & IORESOURCE_ROM_COPY) {
ian@0 229 kfree((void*)(unsigned long)res->start);
ian@0 230 res->flags &= ~IORESOURCE_ROM_COPY;
ian@0 231 res->start = 0;
ian@0 232 res->end = 0;
ian@0 233 }
ian@0 234 }
ian@0 235
ian@0 236 EXPORT_SYMBOL(pci_map_rom);
ian@0 237 EXPORT_SYMBOL(pci_map_rom_copy);
ian@0 238 EXPORT_SYMBOL(pci_unmap_rom);
ian@0 239 EXPORT_SYMBOL(pci_remove_rom);