Initial import

1 files changed, 230 insertions, 0 deletions

diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
new file mode 100644
index 000000000..eb0ad530d
--- /dev/null
+++ b/drivers/pci/rom.c
@@ -0,0 +1,230 @@
+/*
+ * 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/export.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.
+ */
+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->bus, &region, 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;
+}
+EXPORT_SYMBOL_GPL(pci_enable_rom);
+
+/**
+ * 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.
+ */
+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);
+}
+EXPORT_SYMBOL_GPL(pci_disable_rom);
+
+/**
+ * pci_get_rom_size - obtain the actual size of the ROM image
+ * @pdev: target PCI device
+ * @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(struct pci_dev *pdev, void __iomem *rom, size_t size)
+{
+	void __iomem *image;
+	int last_image;
+	unsigned length;
+
+	image = rom;
+	do {
+		void __iomem *pds;
+		/* Standard PCI ROMs start out with these bytes 55 AA */
+		if (readb(image) != 0x55) {
+			dev_err(&pdev->dev, "Invalid ROM contents\n");
+			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;
+		length = readw(pds + 16);
+		image += length * 512;
+	} while (length && !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(pdev, rom, *size);
+	return rom;
+}
+EXPORT_SYMBOL(pci_map_rom);
+
+/**
+ * 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);
+}
+EXPORT_SYMBOL(pci_unmap_rom);
+
+/**
+ * pci_cleanup_rom - free the ROM copy created by pci_map_rom_copy
+ * @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_UNSET;
+		res->flags &= ~IORESOURCE_ROM_COPY;
+		res->start = 0;
+		res->end = 0;
+	}
+}
+
+/**
+ * pci_platform_rom - provides a pointer to any ROM image provided by the
+ * platform
+ * @pdev: pointer to pci device struct
+ * @size: pointer to receive size of pci window over ROM
+ */
+void __iomem *pci_platform_rom(struct pci_dev *pdev, size_t *size)
+{
+	if (pdev->rom && pdev->romlen) {
+		*size = pdev->romlen;
+		return phys_to_virt((phys_addr_t)pdev->rom);
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(pci_platform_rom);