262 lines
7.1 KiB
C
262 lines
7.1 KiB
C
/*
|
|
* drivers/pci/rom.c
|
|
*
|
|
* (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
|
|
* (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
|
|
*
|
|
* PCI ROM access routines
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "pci.h"
|
|
|
|
/**
|
|
* pci_enable_rom - enable ROM decoding for a PCI device
|
|
* @pdev: PCI device to enable
|
|
*
|
|
* Enable ROM decoding on @dev. This involves simply turning on the last
|
|
* bit of the PCI ROM BAR. Note that some cards may share address decoders
|
|
* between the ROM and other resources, so enabling it may disable access
|
|
* to MMIO registers or other card memory.
|
|
*/
|
|
static int pci_enable_rom(struct pci_dev *pdev)
|
|
{
|
|
struct resource *res = pdev->resource + PCI_ROM_RESOURCE;
|
|
struct pci_bus_region region;
|
|
u32 rom_addr;
|
|
|
|
if (!res->flags)
|
|
return -1;
|
|
|
|
pcibios_resource_to_bus(pdev, ®ion, res);
|
|
pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
|
|
rom_addr &= ~PCI_ROM_ADDRESS_MASK;
|
|
rom_addr |= region.start | PCI_ROM_ADDRESS_ENABLE;
|
|
pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_disable_rom - disable ROM decoding for a PCI device
|
|
* @pdev: PCI device to disable
|
|
*
|
|
* Disable ROM decoding on a PCI device by turning off the last bit in the
|
|
* ROM BAR.
|
|
*/
|
|
static void pci_disable_rom(struct pci_dev *pdev)
|
|
{
|
|
u32 rom_addr;
|
|
pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
|
|
rom_addr &= ~PCI_ROM_ADDRESS_ENABLE;
|
|
pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
|
|
}
|
|
|
|
/**
|
|
* pci_get_rom_size - obtain the actual size of the ROM image
|
|
* @rom: kernel virtual pointer to image of ROM
|
|
* @size: size of PCI window
|
|
* return: size of actual ROM image
|
|
*
|
|
* Determine the actual length of the ROM image.
|
|
* The PCI window size could be much larger than the
|
|
* actual image size.
|
|
*/
|
|
size_t pci_get_rom_size(void __iomem *rom, size_t size)
|
|
{
|
|
void __iomem *image;
|
|
int last_image;
|
|
|
|
image = rom;
|
|
do {
|
|
void __iomem *pds;
|
|
/* Standard PCI ROMs start out with these bytes 55 AA */
|
|
if (readb(image) != 0x55)
|
|
break;
|
|
if (readb(image + 1) != 0xAA)
|
|
break;
|
|
/* get the PCI data structure and check its signature */
|
|
pds = image + readw(image + 24);
|
|
if (readb(pds) != 'P')
|
|
break;
|
|
if (readb(pds + 1) != 'C')
|
|
break;
|
|
if (readb(pds + 2) != 'I')
|
|
break;
|
|
if (readb(pds + 3) != 'R')
|
|
break;
|
|
last_image = readb(pds + 21) & 0x80;
|
|
/* this length is reliable */
|
|
image += readw(pds + 16) * 512;
|
|
} while (!last_image);
|
|
|
|
/* never return a size larger than the PCI resource window */
|
|
/* there are known ROMs that get the size wrong */
|
|
return min((size_t)(image - rom), size);
|
|
}
|
|
|
|
/**
|
|
* pci_map_rom - map a PCI ROM to kernel space
|
|
* @pdev: pointer to pci device struct
|
|
* @size: pointer to receive size of pci window over ROM
|
|
* @return: kernel virtual pointer to image of ROM
|
|
*
|
|
* Map a PCI ROM into kernel space. If ROM is boot video ROM,
|
|
* the shadow BIOS copy will be returned instead of the
|
|
* actual ROM.
|
|
*/
|
|
void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
|
|
{
|
|
struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
|
|
loff_t start;
|
|
void __iomem *rom;
|
|
|
|
/*
|
|
* IORESOURCE_ROM_SHADOW set on x86, x86_64 and IA64 supports legacy
|
|
* memory map if the VGA enable bit of the Bridge Control register is
|
|
* set for embedded VGA.
|
|
*/
|
|
if (res->flags & IORESOURCE_ROM_SHADOW) {
|
|
/* primary video rom always starts here */
|
|
start = (loff_t)0xC0000;
|
|
*size = 0x20000; /* cover C000:0 through E000:0 */
|
|
} else {
|
|
if (res->flags &
|
|
(IORESOURCE_ROM_COPY | IORESOURCE_ROM_BIOS_COPY)) {
|
|
*size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
|
|
return (void __iomem *)(unsigned long)
|
|
pci_resource_start(pdev, PCI_ROM_RESOURCE);
|
|
} else {
|
|
/* assign the ROM an address if it doesn't have one */
|
|
if (res->parent == NULL &&
|
|
pci_assign_resource(pdev,PCI_ROM_RESOURCE))
|
|
return NULL;
|
|
start = pci_resource_start(pdev, PCI_ROM_RESOURCE);
|
|
*size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
|
|
if (*size == 0)
|
|
return NULL;
|
|
|
|
/* Enable ROM space decodes */
|
|
if (pci_enable_rom(pdev))
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
rom = ioremap(start, *size);
|
|
if (!rom) {
|
|
/* restore enable if ioremap fails */
|
|
if (!(res->flags & (IORESOURCE_ROM_ENABLE |
|
|
IORESOURCE_ROM_SHADOW |
|
|
IORESOURCE_ROM_COPY)))
|
|
pci_disable_rom(pdev);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Try to find the true size of the ROM since sometimes the PCI window
|
|
* size is much larger than the actual size of the ROM.
|
|
* True size is important if the ROM is going to be copied.
|
|
*/
|
|
*size = pci_get_rom_size(rom, *size);
|
|
return rom;
|
|
}
|
|
|
|
/**
|
|
* pci_map_rom_copy - map a PCI ROM to kernel space, create a copy
|
|
* @pdev: pointer to pci device struct
|
|
* @size: pointer to receive size of pci window over ROM
|
|
* @return: kernel virtual pointer to image of ROM
|
|
*
|
|
* Map a PCI ROM into kernel space. If ROM is boot video ROM,
|
|
* the shadow BIOS copy will be returned instead of the
|
|
* actual ROM.
|
|
*/
|
|
void __iomem *pci_map_rom_copy(struct pci_dev *pdev, size_t *size)
|
|
{
|
|
struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
|
|
void __iomem *rom;
|
|
|
|
rom = pci_map_rom(pdev, size);
|
|
if (!rom)
|
|
return NULL;
|
|
|
|
if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_SHADOW |
|
|
IORESOURCE_ROM_BIOS_COPY))
|
|
return rom;
|
|
|
|
res->start = (unsigned long)kmalloc(*size, GFP_KERNEL);
|
|
if (!res->start)
|
|
return rom;
|
|
|
|
res->end = res->start + *size;
|
|
memcpy_fromio((void*)(unsigned long)res->start, rom, *size);
|
|
pci_unmap_rom(pdev, rom);
|
|
res->flags |= IORESOURCE_ROM_COPY;
|
|
|
|
return (void __iomem *)(unsigned long)res->start;
|
|
}
|
|
|
|
/**
|
|
* pci_unmap_rom - unmap the ROM from kernel space
|
|
* @pdev: pointer to pci device struct
|
|
* @rom: virtual address of the previous mapping
|
|
*
|
|
* Remove a mapping of a previously mapped ROM
|
|
*/
|
|
void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom)
|
|
{
|
|
struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
|
|
|
|
if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_BIOS_COPY))
|
|
return;
|
|
|
|
iounmap(rom);
|
|
|
|
/* Disable again before continuing, leave enabled if pci=rom */
|
|
if (!(res->flags & (IORESOURCE_ROM_ENABLE | IORESOURCE_ROM_SHADOW)))
|
|
pci_disable_rom(pdev);
|
|
}
|
|
|
|
/**
|
|
* pci_remove_rom - disable the ROM and remove its sysfs attribute
|
|
* @pdev: pointer to pci device struct
|
|
*
|
|
* Remove the rom file in sysfs and disable ROM decoding.
|
|
*/
|
|
void pci_remove_rom(struct pci_dev *pdev)
|
|
{
|
|
struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
|
|
|
|
if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
|
|
sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
|
|
if (!(res->flags & (IORESOURCE_ROM_ENABLE |
|
|
IORESOURCE_ROM_SHADOW |
|
|
IORESOURCE_ROM_BIOS_COPY |
|
|
IORESOURCE_ROM_COPY)))
|
|
pci_disable_rom(pdev);
|
|
}
|
|
|
|
/**
|
|
* pci_cleanup_rom - internal routine for freeing the ROM copy created
|
|
* by pci_map_rom_copy called from remove.c
|
|
* @pdev: pointer to pci device struct
|
|
*
|
|
* Free the copied ROM if we allocated one.
|
|
*/
|
|
void pci_cleanup_rom(struct pci_dev *pdev)
|
|
{
|
|
struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
|
|
if (res->flags & IORESOURCE_ROM_COPY) {
|
|
kfree((void*)(unsigned long)res->start);
|
|
res->flags &= ~IORESOURCE_ROM_COPY;
|
|
res->start = 0;
|
|
res->end = 0;
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(pci_map_rom);
|
|
EXPORT_SYMBOL(pci_map_rom_copy);
|
|
EXPORT_SYMBOL(pci_unmap_rom);
|
|
EXPORT_SYMBOL(pci_remove_rom);
|