1 files changed, 88 insertions, 99 deletions

diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
index 598a115cd00..f955edb9bea 100644
--- a/drivers/pci/rom.c
+++ b/drivers/pci/rom.c
@@ -6,8 +6,8 @@
  *
  * PCI ROM access routines
  */
-#include <linux/config.h>
 #include <linux/kernel.h>
+#include <linux/export.h>
 #include <linux/pci.h>
 #include <linux/slab.h>
 
@@ -22,7 +22,7 @@
  * 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)
+int pci_enable_rom(struct pci_dev *pdev)
 {
 	struct resource *res = pdev->resource + PCI_ROM_RESOURCE;
 	struct pci_bus_region region;
@@ -31,13 +31,14 @@ static int pci_enable_rom(struct pci_dev *pdev)
 	if (!res->flags)
 		return -1;
 
-	pcibios_resource_to_bus(pdev, &region, res);
+	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
@@ -46,19 +47,67 @@ static int pci_enable_rom(struct pci_dev *pdev)
  * 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)
+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;
+
+	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;
+		/* 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
+ *
+ * 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
@@ -69,23 +118,26 @@ 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;
-	void __iomem *image;
-	int last_image;
 
-	/* IORESOURCE_ROM_SHADOW only set on x86 */
+	/*
+	 * 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) {
+		if (res->flags &
+			(IORESOURCE_ROM_COPY | IORESOURCE_ROM_BIOS_COPY)) {
 			*size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
-			return (void __iomem *)pci_resource_start(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))
+			    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);
@@ -113,69 +165,10 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
 	 * size is much larger than the actual size of the ROM.
 	 * True size is important if the ROM is going to be copied.
 	 */
-	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 */
-	*size = min((size_t)(image - rom), *size);
-
+	*size = pci_get_rom_size(pdev, 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))
-		return rom;
-
-	res->start = (unsigned long)kmalloc(*size, GFP_KERNEL);
-	if (!res->start)
-		return rom;
-
-	res->end = res->start + *size;
-	memcpy_fromio((void*)res->start, rom, *size);
-	pci_unmap_rom(pdev, rom);
-	res->flags |= IORESOURCE_ROM_COPY;
-
-	return (void __iomem *)res->start;
-}
+EXPORT_SYMBOL(pci_map_rom);
 
 /**
  * pci_unmap_rom - unmap the ROM from kernel space
@@ -188,7 +181,7 @@ 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)
+	if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_BIOS_COPY))
 		return;
 
 	iounmap(rom);
@@ -197,28 +190,10 @@ void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom)
 	if (!(res->flags & (IORESOURCE_ROM_ENABLE | IORESOURCE_ROM_SHADOW)))
 		pci_disable_rom(pdev);
 }
+EXPORT_SYMBOL(pci_unmap_rom);
 
 /**
- * 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_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
+ * 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.
@@ -226,15 +201,29 @@ void pci_remove_rom(struct pci_dev *pdev)
 void pci_cleanup_rom(struct pci_dev *pdev)
 {
 	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
+
 	if (res->flags & IORESOURCE_ROM_COPY) {
-		kfree((void*)res->start);
+		kfree((void *)(unsigned long)res->start);
+		res->flags |= IORESOURCE_UNSET;
 		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);
+/**
+ * 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);