1 files changed, 227 insertions, 0 deletions

diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
new file mode 100644
index 000000000000..3e64ff64b38c
--- /dev/null
+++ b/drivers/pci/rom.c
@@ -0,0 +1,227 @@
+/*
+ * 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/config.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+
+#include "pci.h"
+
+/**
+ * pci_enable_rom - enable ROM decoding for a PCI device
+ * @dev: 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 void pci_enable_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_disable_rom - disable ROM decoding for a PCI device
+ * @dev: 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_map_rom - map a PCI ROM to kernel space
+ * @dev: 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;
+        void __iomem *image;
+        int last_image;
+
+        /* IORESOURCE_ROM_SHADOW only set on x86 */
+        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) {
+                        *size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
+                        return (void __iomem *)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);
+
+                        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 */
+                        pci_enable_rom(pdev);
+                }
+        }
+
+        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.
+         */
+        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);
+
+        *size = image - rom;
+
+        return rom;
+}
+
+/**
+ * pci_map_rom_copy - map a PCI ROM to kernel space, create a copy
+ * @dev: 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;
+}
+
+/**
+ * pci_unmap_rom - unmap the ROM from kernel space
+ * @dev: 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)
+                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
+ * @dev: 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
+ * @dev: 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*)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);