4 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
5 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
7 * PCI ROM access routines
9 #include <linux/config.h>
10 #include <linux/kernel.h>
11 #include <linux/pci.h>
16 * pci_enable_rom - enable ROM decoding for a PCI device
17 * @pdev: PCI device to enable
19 * Enable ROM decoding on @dev. This involves simply turning on the last
20 * bit of the PCI ROM BAR. Note that some cards may share address decoders
21 * between the ROM and other resources, so enabling it may disable access
22 * to MMIO registers or other card memory.
24 static void pci_enable_rom(struct pci_dev
*pdev
)
28 pci_read_config_dword(pdev
, pdev
->rom_base_reg
, &rom_addr
);
29 rom_addr
|= PCI_ROM_ADDRESS_ENABLE
;
30 pci_write_config_dword(pdev
, pdev
->rom_base_reg
, rom_addr
);
34 * pci_disable_rom - disable ROM decoding for a PCI device
35 * @pdev: PCI device to disable
37 * Disable ROM decoding on a PCI device by turning off the last bit in the
40 static void pci_disable_rom(struct pci_dev
*pdev
)
43 pci_read_config_dword(pdev
, pdev
->rom_base_reg
, &rom_addr
);
44 rom_addr
&= ~PCI_ROM_ADDRESS_ENABLE
;
45 pci_write_config_dword(pdev
, pdev
->rom_base_reg
, rom_addr
);
49 * pci_map_rom - map a PCI ROM to kernel space
50 * @pdev: pointer to pci device struct
51 * @size: pointer to receive size of pci window over ROM
52 * @return: kernel virtual pointer to image of ROM
54 * Map a PCI ROM into kernel space. If ROM is boot video ROM,
55 * the shadow BIOS copy will be returned instead of the
58 void __iomem
*pci_map_rom(struct pci_dev
*pdev
, size_t *size
)
60 struct resource
*res
= &pdev
->resource
[PCI_ROM_RESOURCE
];
66 /* IORESOURCE_ROM_SHADOW only set on x86 */
67 if (res
->flags
& IORESOURCE_ROM_SHADOW
) {
68 /* primary video rom always starts here */
69 start
= (loff_t
)0xC0000;
70 *size
= 0x20000; /* cover C000:0 through E000:0 */
72 if (res
->flags
& IORESOURCE_ROM_COPY
) {
73 *size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
74 return (void __iomem
*)pci_resource_start(pdev
, PCI_ROM_RESOURCE
);
76 /* assign the ROM an address if it doesn't have one */
77 if (res
->parent
== NULL
)
78 pci_assign_resource(pdev
, PCI_ROM_RESOURCE
);
80 start
= pci_resource_start(pdev
, PCI_ROM_RESOURCE
);
81 *size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
85 /* Enable ROM space decodes */
90 rom
= ioremap(start
, *size
);
92 /* restore enable if ioremap fails */
93 if (!(res
->flags
& (IORESOURCE_ROM_ENABLE
|
94 IORESOURCE_ROM_SHADOW
|
95 IORESOURCE_ROM_COPY
)))
96 pci_disable_rom(pdev
);
101 * Try to find the true size of the ROM since sometimes the PCI window
102 * size is much larger than the actual size of the ROM.
103 * True size is important if the ROM is going to be copied.
108 /* Standard PCI ROMs start out with these bytes 55 AA */
109 if (readb(image
) != 0x55)
111 if (readb(image
+ 1) != 0xAA)
113 /* get the PCI data structure and check its signature */
114 pds
= image
+ readw(image
+ 24);
115 if (readb(pds
) != 'P')
117 if (readb(pds
+ 1) != 'C')
119 if (readb(pds
+ 2) != 'I')
121 if (readb(pds
+ 3) != 'R')
123 last_image
= readb(pds
+ 21) & 0x80;
124 /* this length is reliable */
125 image
+= readw(pds
+ 16) * 512;
126 } while (!last_image
);
134 * pci_map_rom_copy - map a PCI ROM to kernel space, create a copy
135 * @pdev: pointer to pci device struct
136 * @size: pointer to receive size of pci window over ROM
137 * @return: kernel virtual pointer to image of ROM
139 * Map a PCI ROM into kernel space. If ROM is boot video ROM,
140 * the shadow BIOS copy will be returned instead of the
143 void __iomem
*pci_map_rom_copy(struct pci_dev
*pdev
, size_t *size
)
145 struct resource
*res
= &pdev
->resource
[PCI_ROM_RESOURCE
];
148 rom
= pci_map_rom(pdev
, size
);
152 if (res
->flags
& (IORESOURCE_ROM_COPY
| IORESOURCE_ROM_SHADOW
))
155 res
->start
= (unsigned long)kmalloc(*size
, GFP_KERNEL
);
159 res
->end
= res
->start
+ *size
;
160 memcpy_fromio((void*)res
->start
, rom
, *size
);
161 pci_unmap_rom(pdev
, rom
);
162 res
->flags
|= IORESOURCE_ROM_COPY
;
164 return (void __iomem
*)res
->start
;
168 * pci_unmap_rom - unmap the ROM from kernel space
169 * @pdev: pointer to pci device struct
170 * @rom: virtual address of the previous mapping
172 * Remove a mapping of a previously mapped ROM
174 void pci_unmap_rom(struct pci_dev
*pdev
, void __iomem
*rom
)
176 struct resource
*res
= &pdev
->resource
[PCI_ROM_RESOURCE
];
178 if (res
->flags
& IORESOURCE_ROM_COPY
)
183 /* Disable again before continuing, leave enabled if pci=rom */
184 if (!(res
->flags
& (IORESOURCE_ROM_ENABLE
| IORESOURCE_ROM_SHADOW
)))
185 pci_disable_rom(pdev
);
189 * pci_remove_rom - disable the ROM and remove its sysfs attribute
190 * @pdev: pointer to pci device struct
192 * Remove the rom file in sysfs and disable ROM decoding.
194 void pci_remove_rom(struct pci_dev
*pdev
)
196 struct resource
*res
= &pdev
->resource
[PCI_ROM_RESOURCE
];
198 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
199 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
200 if (!(res
->flags
& (IORESOURCE_ROM_ENABLE
|
201 IORESOURCE_ROM_SHADOW
|
202 IORESOURCE_ROM_COPY
)))
203 pci_disable_rom(pdev
);
207 * pci_cleanup_rom - internal routine for freeing the ROM copy created
208 * by pci_map_rom_copy called from remove.c
209 * @pdev: pointer to pci device struct
211 * Free the copied ROM if we allocated one.
213 void pci_cleanup_rom(struct pci_dev
*pdev
)
215 struct resource
*res
= &pdev
->resource
[PCI_ROM_RESOURCE
];
216 if (res
->flags
& IORESOURCE_ROM_COPY
) {
217 kfree((void*)res
->start
);
218 res
->flags
&= ~IORESOURCE_ROM_COPY
;
224 EXPORT_SYMBOL(pci_map_rom
);
225 EXPORT_SYMBOL(pci_map_rom_copy
);
226 EXPORT_SYMBOL(pci_unmap_rom
);
227 EXPORT_SYMBOL(pci_remove_rom
);
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