1 /* 2 * amd76xrom.c 3 * 4 * Normal mappings of chips in physical memory 5 */ 6 7 #include <linux/module.h> 8 #include <linux/types.h> 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <linux/slab.h> 12 #include <asm/io.h> 13 #include <linux/mtd/mtd.h> 14 #include <linux/mtd/map.h> 15 #include <linux/mtd/cfi.h> 16 #include <linux/mtd/flashchip.h> 17 #include <linux/pci.h> 18 #include <linux/pci_ids.h> 19 #include <linux/list.h> 20 21 22 #define xstr(s) str(s) 23 #define str(s) #s 24 #define MOD_NAME xstr(KBUILD_BASENAME) 25 26 #define ADDRESS_NAME_LEN 18 27 28 #define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */ 29 30 struct amd76xrom_window { 31 void __iomem *virt; 32 unsigned long phys; 33 unsigned long size; 34 struct list_head maps; 35 struct resource rsrc; 36 struct pci_dev *pdev; 37 }; 38 39 struct amd76xrom_map_info { 40 struct list_head list; 41 struct map_info map; 42 struct mtd_info *mtd; 43 struct resource rsrc; 44 char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN]; 45 }; 46 47 /* The 2 bits controlling the window size are often set to allow reading 48 * the BIOS, but too small to allow writing, since the lock registers are 49 * 4MiB lower in the address space than the data. 50 * 51 * This is intended to prevent flashing the bios, perhaps accidentally. 52 * 53 * This parameter allows the normal driver to over-ride the BIOS settings. 54 * 55 * The bits are 6 and 7. If both bits are set, it is a 5MiB window. 56 * If only the 7 Bit is set, it is a 4MiB window. Otherwise, a 57 * 64KiB window. 58 * 59 */ 60 static uint win_size_bits; 61 module_param(win_size_bits, uint, 0); 62 MODULE_PARM_DESC(win_size_bits, "ROM window size bits override for 0x43 byte, normally set by BIOS."); 63 64 static struct amd76xrom_window amd76xrom_window = { 65 .maps = LIST_HEAD_INIT(amd76xrom_window.maps), 66 }; 67 68 static void amd76xrom_cleanup(struct amd76xrom_window *window) 69 { 70 struct amd76xrom_map_info *map, *scratch; 71 u8 byte; 72 73 if (window->pdev) { 74 /* Disable writes through the rom window */ 75 pci_read_config_byte(window->pdev, 0x40, &byte); 76 pci_write_config_byte(window->pdev, 0x40, byte & ~1); 77 pci_dev_put(window->pdev); 78 } 79 80 /* Free all of the mtd devices */ 81 list_for_each_entry_safe(map, scratch, &window->maps, list) { 82 if (map->rsrc.parent) { 83 release_resource(&map->rsrc); 84 } 85 del_mtd_device(map->mtd); 86 map_destroy(map->mtd); 87 list_del(&map->list); 88 kfree(map); 89 } 90 if (window->rsrc.parent) 91 release_resource(&window->rsrc); 92 93 if (window->virt) { 94 iounmap(window->virt); 95 window->virt = NULL; 96 window->phys = 0; 97 window->size = 0; 98 window->pdev = NULL; 99 } 100 } 101 102 103 static int __devinit amd76xrom_init_one (struct pci_dev *pdev, 104 const struct pci_device_id *ent) 105 { 106 static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL }; 107 u8 byte; 108 struct amd76xrom_window *window = &amd76xrom_window; 109 struct amd76xrom_map_info *map = NULL; 110 unsigned long map_top; 111 112 /* Remember the pci dev I find the window in - already have a ref */ 113 window->pdev = pdev; 114 115 /* Enable the selected rom window. This is often incorrectly 116 * set up by the BIOS, and the 4MiB offset for the lock registers 117 * requires the full 5MiB of window space. 118 * 119 * This 'write, then read' approach leaves the bits for 120 * other uses of the hardware info. 121 */ 122 pci_read_config_byte(pdev, 0x43, &byte); 123 pci_write_config_byte(pdev, 0x43, byte | win_size_bits ); 124 125 /* Assume the rom window is properly setup, and find it's size */ 126 pci_read_config_byte(pdev, 0x43, &byte); 127 if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) { 128 window->phys = 0xffb00000; /* 5MiB */ 129 } 130 else if ((byte & (1<<7)) == (1<<7)) { 131 window->phys = 0xffc00000; /* 4MiB */ 132 } 133 else { 134 window->phys = 0xffff0000; /* 64KiB */ 135 } 136 window->size = 0xffffffffUL - window->phys + 1UL; 137 138 /* 139 * Try to reserve the window mem region. If this fails then 140 * it is likely due to a fragment of the window being 141 * "reseved" by the BIOS. In the case that the 142 * request_mem_region() fails then once the rom size is 143 * discovered we will try to reserve the unreserved fragment. 144 */ 145 window->rsrc.name = MOD_NAME; 146 window->rsrc.start = window->phys; 147 window->rsrc.end = window->phys + window->size - 1; 148 window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; 149 if (request_resource(&iomem_resource, &window->rsrc)) { 150 window->rsrc.parent = NULL; 151 printk(KERN_ERR MOD_NAME 152 " %s(): Unable to register resource" 153 " 0x%.16llx-0x%.16llx - kernel bug?\n", 154 __func__, 155 (unsigned long long)window->rsrc.start, 156 (unsigned long long)window->rsrc.end); 157 } 158 159 160 /* Enable writes through the rom window */ 161 pci_read_config_byte(pdev, 0x40, &byte); 162 pci_write_config_byte(pdev, 0x40, byte | 1); 163 164 /* FIXME handle registers 0x80 - 0x8C the bios region locks */ 165 166 /* For write accesses caches are useless */ 167 window->virt = ioremap_nocache(window->phys, window->size); 168 if (!window->virt) { 169 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n", 170 window->phys, window->size); 171 goto out; 172 } 173 174 /* Get the first address to look for an rom chip at */ 175 map_top = window->phys; 176 #if 1 177 /* The probe sequence run over the firmware hub lock 178 * registers sets them to 0x7 (no access). 179 * Probe at most the last 4M of the address space. 180 */ 181 if (map_top < 0xffc00000) { 182 map_top = 0xffc00000; 183 } 184 #endif 185 /* Loop through and look for rom chips */ 186 while((map_top - 1) < 0xffffffffUL) { 187 struct cfi_private *cfi; 188 unsigned long offset; 189 int i; 190 191 if (!map) { 192 map = kmalloc(sizeof(*map), GFP_KERNEL); 193 } 194 if (!map) { 195 printk(KERN_ERR MOD_NAME ": kmalloc failed"); 196 goto out; 197 } 198 memset(map, 0, sizeof(*map)); 199 INIT_LIST_HEAD(&map->list); 200 map->map.name = map->map_name; 201 map->map.phys = map_top; 202 offset = map_top - window->phys; 203 map->map.virt = (void __iomem *) 204 (((unsigned long)(window->virt)) + offset); 205 map->map.size = 0xffffffffUL - map_top + 1UL; 206 /* Set the name of the map to the address I am trying */ 207 sprintf(map->map_name, "%s @%08Lx", 208 MOD_NAME, (unsigned long long)map->map.phys); 209 210 /* There is no generic VPP support */ 211 for(map->map.bankwidth = 32; map->map.bankwidth; 212 map->map.bankwidth >>= 1) 213 { 214 char **probe_type; 215 /* Skip bankwidths that are not supported */ 216 if (!map_bankwidth_supported(map->map.bankwidth)) 217 continue; 218 219 /* Setup the map methods */ 220 simple_map_init(&map->map); 221 222 /* Try all of the probe methods */ 223 probe_type = rom_probe_types; 224 for(; *probe_type; probe_type++) { 225 map->mtd = do_map_probe(*probe_type, &map->map); 226 if (map->mtd) 227 goto found; 228 } 229 } 230 map_top += ROM_PROBE_STEP_SIZE; 231 continue; 232 found: 233 /* Trim the size if we are larger than the map */ 234 if (map->mtd->size > map->map.size) { 235 printk(KERN_WARNING MOD_NAME 236 " rom(%llu) larger than window(%lu). fixing...\n", 237 (unsigned long long)map->mtd->size, map->map.size); 238 map->mtd->size = map->map.size; 239 } 240 if (window->rsrc.parent) { 241 /* 242 * Registering the MTD device in iomem may not be possible 243 * if there is a BIOS "reserved" and BUSY range. If this 244 * fails then continue anyway. 245 */ 246 map->rsrc.name = map->map_name; 247 map->rsrc.start = map->map.phys; 248 map->rsrc.end = map->map.phys + map->mtd->size - 1; 249 map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; 250 if (request_resource(&window->rsrc, &map->rsrc)) { 251 printk(KERN_ERR MOD_NAME 252 ": cannot reserve MTD resource\n"); 253 map->rsrc.parent = NULL; 254 } 255 } 256 257 /* Make the whole region visible in the map */ 258 map->map.virt = window->virt; 259 map->map.phys = window->phys; 260 cfi = map->map.fldrv_priv; 261 for(i = 0; i < cfi->numchips; i++) { 262 cfi->chips[i].start += offset; 263 } 264 265 /* Now that the mtd devices is complete claim and export it */ 266 map->mtd->owner = THIS_MODULE; 267 if (add_mtd_device(map->mtd)) { 268 map_destroy(map->mtd); 269 map->mtd = NULL; 270 goto out; 271 } 272 273 274 /* Calculate the new value of map_top */ 275 map_top += map->mtd->size; 276 277 /* File away the map structure */ 278 list_add(&map->list, &window->maps); 279 map = NULL; 280 } 281 282 out: 283 /* Free any left over map structures */ 284 kfree(map); 285 /* See if I have any map structures */ 286 if (list_empty(&window->maps)) { 287 amd76xrom_cleanup(window); 288 return -ENODEV; 289 } 290 return 0; 291 } 292 293 294 static void __devexit amd76xrom_remove_one (struct pci_dev *pdev) 295 { 296 struct amd76xrom_window *window = &amd76xrom_window; 297 298 amd76xrom_cleanup(window); 299 } 300 301 static struct pci_device_id amd76xrom_pci_tbl[] = { 302 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410, 303 PCI_ANY_ID, PCI_ANY_ID, }, 304 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440, 305 PCI_ANY_ID, PCI_ANY_ID, }, 306 { PCI_VENDOR_ID_AMD, 0x7468 }, /* amd8111 support */ 307 { 0, } 308 }; 309 310 MODULE_DEVICE_TABLE(pci, amd76xrom_pci_tbl); 311 312 #if 0 313 static struct pci_driver amd76xrom_driver = { 314 .name = MOD_NAME, 315 .id_table = amd76xrom_pci_tbl, 316 .probe = amd76xrom_init_one, 317 .remove = amd76xrom_remove_one, 318 }; 319 #endif 320 321 static int __init init_amd76xrom(void) 322 { 323 struct pci_dev *pdev; 324 struct pci_device_id *id; 325 pdev = NULL; 326 for(id = amd76xrom_pci_tbl; id->vendor; id++) { 327 pdev = pci_get_device(id->vendor, id->device, NULL); 328 if (pdev) { 329 break; 330 } 331 } 332 if (pdev) { 333 return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]); 334 } 335 return -ENXIO; 336 #if 0 337 return pci_register_driver(&amd76xrom_driver); 338 #endif 339 } 340 341 static void __exit cleanup_amd76xrom(void) 342 { 343 amd76xrom_remove_one(amd76xrom_window.pdev); 344 } 345 346 module_init(init_amd76xrom); 347 module_exit(cleanup_amd76xrom); 348 349 MODULE_LICENSE("GPL"); 350 MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>"); 351 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD76X southbridge"); 352 353