diff options
Diffstat (limited to 'drivers/mtd/maps/amd76xrom.c')
| -rw-r--r-- | drivers/mtd/maps/amd76xrom.c | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/drivers/mtd/maps/amd76xrom.c b/drivers/mtd/maps/amd76xrom.c new file mode 100644 index 000000000..f7207b0a7 --- /dev/null +++ b/drivers/mtd/maps/amd76xrom.c @@ -0,0 +1,349 @@ +/* + * 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; + } + return 0; +} + + +static void amd76xrom_remove_one(struct pci_dev *pdev) +{ + struct amd76xrom_window *window = &amd76xrom_window; + + amd76xrom_cleanup(window); +} + +static struct pci_device_id amd76xrom_pci_tbl[] = { + { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410, + PCI_ANY_ID, PCI_ANY_ID, }, + { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440, + PCI_ANY_ID, PCI_ANY_ID, }, + { PCI_VENDOR_ID_AMD, 0x7468 }, /* amd8111 support */ + { 0, } +}; + +MODULE_DEVICE_TABLE(pci, amd76xrom_pci_tbl); + +#if 0 +static struct pci_driver amd76xrom_driver = { + .name = MOD_NAME, + .id_table = amd76xrom_pci_tbl, + .probe = amd76xrom_init_one, + .remove = amd76xrom_remove_one, +}; +#endif + +static int __init init_amd76xrom(void) +{ + struct pci_dev *pdev; + struct pci_device_id *id; + pdev = NULL; + for(id = amd76xrom_pci_tbl; id->vendor; id++) { + pdev = pci_get_device(id->vendor, id->device, NULL); + if (pdev) { + break; + } + } + if (pdev) { + return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]); + } + return -ENXIO; +#if 0 + return pci_register_driver(&amd76xrom_driver); +#endif +} + +static void __exit cleanup_amd76xrom(void) +{ + amd76xrom_remove_one(amd76xrom_window.pdev); +} + +module_init(init_amd76xrom); +module_exit(cleanup_amd76xrom); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>"); +MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD76X southbridge"); |