cmb.rar_physical

/* * amd76xrom.c * * Normal mappings of chips in physical memory */ #include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/slab.h> #include <asm/io.h> #include <linux/mtd/mtd.h> #include <linux/mtd/map.h> #include <linux/mtd/cfi.h> #include <linux/mtd/flashchip.h> #include <linux/pci.h> #include <linux/pci_ids.h> #include <linux/list.h> #define xstr(s) str(s) #define str(s) #s #define MOD_NAME xstr(KBUILD_BASENAME) #define ADDRESS_NAME_LEN 18 #define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */ struct amd76xrom_window { void __iomem *virt; unsigned long phys; unsigned long size; struct list_head maps; struct resource rsrc; struct pci_dev *pdev; }; struct amd76xrom_map_info { struct list_head list; struct map_info map; struct mtd_info *mtd; struct resource rsrc; char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN]; }; /* The 2 bits controlling the window size are often set to allow reading * the BIOS, but too small to allow writing, since the lock registers are * 4MiB lower in the address space than the data. * * This is intended to prevent flashing the bios, perhaps accidentally. * * This parameter allows the normal driver to over-ride the BIOS settings. * * The bits are 6 and 7. If both bits are set, it is a 5MiB window. * If only the 7 Bit is set, it is a 4MiB window. Otherwise, a * 64KiB window. * */ static uint win_size_bits; module_param(win_size_bits, uint, 0); MODULE_PARM_DESC(win_size_bits, "ROM window size bits override for 0x43 byte, normally set by BIOS."); static struct amd76xrom_window amd76xrom_window = { .maps = LIST_HEAD_INIT(amd76xrom_window.maps), }; static void amd76xrom_cleanup(struct amd76xrom_window *window) { struct amd76xrom_map_info *map, *scratch; u8 byte; if (window->pdev) { /* Disable writes through the rom window */ pci_read_config_byte(window->pdev, 0x40, &byte); pci_write_config_byte(window->pdev, 0x40, byte & ~1); pci_dev_put(window->pdev); } /* Free all of the mtd devices */ list_for_each_entry_safe(map, scratch, &window->maps, list) { if (map->rsrc.parent) { release_resource(&map->rsrc); } mtd_device_unregister(map->mtd); map_destroy(map->mtd); list_del(&map->list); kfree(map); } if (window->rsrc.parent) release_resource(&window->rsrc); if (window->virt) { iounmap(window->virt); window->virt = NULL; window->phys = 0; window->size = 0; window->pdev = NULL; } } static int amd76xrom_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) { static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL }; u8 byte; struct amd76xrom_window *window = &amd76xrom_window; struct amd76xrom_map_info *map = NULL; unsigned long map_top; /* Remember the pci dev I find the window in - already have a ref */ window->pdev = pdev; /* Enable the selected rom window. This is often incorrectly * set up by the BIOS, and the 4MiB offset for the lock registers * requires the full 5MiB of window space. * * This 'write, then read' approach leaves the bits for * other uses of the hardware info. */ pci_read_config_byte(pdev, 0x43, &byte); pci_write_config_byte(pdev, 0x43, byte | win_size_bits ); /* Assume the rom window is properly setup, and find it's size */ pci_read_config_byte(pdev, 0x43, &byte); if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) { window->phys = 0xffb00000; /* 5MiB */ } else if ((byte & (1<<7)) == (1<<7)) { window->phys = 0xffc00000; /* 4MiB */ } else { window->phys = 0xffff0000; /* 64KiB */ } window->size = 0xffffffffUL - window->phys + 1UL; /* * Try to reserve the window mem region. If this fails then * it is likely due to a fragment of the window being * "reseved" by the BIOS. In the case that the * request_mem_region() fails then once the rom size is * discovered we will try to reserve the unreserved fragment. */ window->rsrc.name = MOD_NAME; window->rsrc.start = window->phys; window->rsrc.end = window->phys + window->size - 1; window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; if (request_resource(&iomem_resource, &window->rsrc)) { window->rsrc.parent = NULL; printk(KERN_ERR MOD_NAME " %s(): Unable to register resource %pR - kernel bug?\n", __func__, &window->rsrc); return -EBUSY; } /* Enable writes through the rom window */ pci_read_config_byte(pdev, 0x40, &byte); pci_write_config_byte(pdev, 0x40, byte | 1); /* FIXME handle registers 0x80 - 0x8C the bios region locks */ /* For write accesses caches are useless */ window->virt = ioremap_nocache(window->phys, window->size); if (!window->virt) { printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n", window->phys, window->size); goto out; } /* Get the first address to look for an rom chip at */ map_top = window->phys; #if 1 /* The probe sequence run over the firmware hub lock * registers sets them to 0x7 (no access). * Probe at most the last 4M of the address space. */ if (map_top < 0xffc00000) { map_top = 0xffc00000; } #endif /* Loop through and look for rom chips */ while((map_top - 1) < 0xffffffffUL) { struct cfi_private *cfi; unsigned long offset; int i; if (!map) { map = kmalloc(sizeof(*map), GFP_KERNEL); } if (!map) { printk(KERN_ERR MOD_NAME ": kmalloc failed"); goto out; } memset(map, 0, sizeof(*map)); INIT_LIST_HEAD(&map->list); map->map.name = map->map_name; map->map.phys = map_top; offset = map_top - window->phys; map->map.virt = (void __iomem *) (((unsigned long)(window->virt)) + offset); map->map.size = 0xffffffffUL - map_top + 1UL; /* Set the name of the map to the address I am trying */ sprintf(map->map_name, "%s @%08Lx", MOD_NAME, (unsigned long long)map->map.phys); /* There is no generic VPP support */ for(map->map.bankwidth = 32; map->map.bankwidth; map->map.bankwidth >>= 1) { char **probe_type; /* Skip bankwidths that are not supported */ if (!map_bankwidth_supported(map->map.bankwidth)) continue; /* Setup the map methods */ simple_map_init(&map->map); /* Try all of the probe methods */ probe_type = rom_probe_types; for(; *probe_type; probe_type++) { map->mtd = do_map_probe(*probe_type, &map->map); if (map->mtd) goto found; } } map_top += ROM_PROBE_STEP_SIZE; continue; found: /* Trim the size if we are larger than the map */ if (map->mtd->size > map->map.size) { printk(KERN_WARNING MOD_NAME " rom(%llu) larger than window(%lu). fixing...\n", (unsigned long long)map->mtd->size, map->map.size); map->mtd->size = map->map.size; } if (window->rsrc.parent) { /* * Registering the MTD device in iomem may not be possible * if there is a BIOS "reserved" and BUSY range. If this * fails then continue anyway. */ map->rsrc.name = map->map_name; map->rsrc.start = map->map.phys; map->rsrc.end = map->map.phys + map->mtd->size - 1; map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; if (request_resource(&window->rsrc, &map->rsrc)) { printk(KERN_ERR MOD_NAME ": cannot reserve MTD resource\n"); map->rsrc.parent = NULL; } } /* Make the whole region visible in the map */ map->map.virt = window->virt; map->map.phys = window->phys; cfi = map->map.fldrv_priv; for(i = 0; i < cfi->numchips; i++) { cfi->chips[i].start += offset; } /* Now that the mtd devices is complete claim and export it */ map->mtd->owner = THIS_MODULE; if (mtd_device_register(map->mtd, NULL, 0)) { map_destroy(map->mtd); map->mtd = NULL; goto out; } /* Calculate the new value of map_top */ map_top += map->mtd->size; /* File away the map structure */ list_add(&map->list, &window->maps); map = NULL; } out: /* Free any left over map structures */ kfree(map); /* See if I have any map structures */ if (list_empty(&window->maps)) { amd76xrom_cleanup(window); return -ENODEV;