3  * PCI ROM access routines
16  * pci_enable_rom - enable ROM decoding for a PCI device
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
38 	 * Ideally pci_update_resource() would update the ROM BAR address,  in pci_enable_rom()
40 	 * devices have buggy ROM BARs that read as zero when disabled.  in pci_enable_rom()
52  * pci_disable_rom - disable ROM decoding for a PCI device
55  * Disable ROM decoding on a PCI device by turning off the last bit in the
56  * ROM BAR.
73  * pci_get_rom_size - obtain the actual size of the ROM image
75  * @rom: kernel virtual pointer to image of ROM
77  *  return: size of actual ROM image
79  * Determine the actual length of the ROM image.
83 static size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom,  in pci_get_rom_size()  argument
90 	image = rom;  in pci_get_rom_size()
95 			pci_info(pdev, "Invalid PCI ROM header signature: expecting 0xaa55, got %#06x\n",  in pci_get_rom_size()
102 			pci_info(pdev, "Invalid PCI ROM data signature: expecting 0x52494350, got %#010x\n",  in pci_get_rom_size()
110 		if (image >= rom + size)  in pci_get_rom_size()
114 				pci_info(pdev, "No more image in the PCI ROM\n");  in pci_get_rom_size()
122 	return min((size_t)(image - rom), size);  in pci_get_rom_size()
126  * pci_map_rom - map a PCI ROM to kernel space
128  * @size: pointer to receive size of pci window over ROM
130  * Return: kernel virtual pointer to image of ROM
132  * Map a PCI ROM into kernel space. If ROM is boot video ROM,
134  * actual ROM.
140 	void __iomem *rom;  in pci_map_rom()  local
142 	/* assign the ROM an address if it doesn't have one */  in pci_map_rom()
151 	/* Enable ROM space decodes */  in pci_map_rom()
155 	rom = ioremap(start, *size);  in pci_map_rom()
156 	if (!rom)  in pci_map_rom()
160 	 * Try to find the true size of the ROM since sometimes the PCI window  in pci_map_rom()
161 	 * size is much larger than the actual size of the ROM.  in pci_map_rom()
162 	 * True size is important if the ROM is going to be copied.  in pci_map_rom()
164 	*size = pci_get_rom_size(pdev, rom, *size);  in pci_map_rom()
168 	return rom;  in pci_map_rom()
171 	iounmap(rom);  in pci_map_rom()
181  * pci_unmap_rom - unmap the ROM from kernel space
183  * @rom: virtual address of the previous mapping
185  * Remove a mapping of a previously mapped ROM
187 void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom)  in pci_unmap_rom()  argument
191 	iounmap(rom);  in pci_unmap_rom()
200  * pci_platform_rom - provides a pointer to any ROM image provided by the
203  * @size: pointer to receive size of pci window over ROM
207 	if (pdev->rom && pdev->romlen) {  in pci_platform_rom()
209 		return phys_to_virt((phys_addr_t)pdev->rom);  in pci_platform_rom()