1 /* 2 * ichxrom.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 <asm/io.h> 12 #include <linux/mtd/mtd.h> 13 #include <linux/mtd/map.h> 14 #include <linux/mtd/cfi.h> 15 #include <linux/mtd/flashchip.h> 16 #include <linux/pci.h> 17 #include <linux/pci_ids.h> 18 #include <linux/list.h> 19 20 #define xstr(s) str(s) 21 #define str(s) #s 22 #define MOD_NAME xstr(KBUILD_BASENAME) 23 24 #define ADDRESS_NAME_LEN 18 25 26 #define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */ 27 28 #define BIOS_CNTL 0x4e 29 #define FWH_DEC_EN1 0xE3 30 #define FWH_DEC_EN2 0xF0 31 #define FWH_SEL1 0xE8 32 #define FWH_SEL2 0xEE 33 34 struct ichxrom_window { 35 void __iomem* virt; 36 unsigned long phys; 37 unsigned long size; 38 struct list_head maps; 39 struct resource rsrc; 40 struct pci_dev *pdev; 41 }; 42 43 struct ichxrom_map_info { 44 struct list_head list; 45 struct map_info map; 46 struct mtd_info *mtd; 47 struct resource rsrc; 48 char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN]; 49 }; 50 51 static struct ichxrom_window ichxrom_window = { 52 .maps = LIST_HEAD_INIT(ichxrom_window.maps), 53 }; 54 55 static void ichxrom_cleanup(struct ichxrom_window *window) 56 { 57 struct ichxrom_map_info *map, *scratch; 58 u16 word; 59 60 /* Disable writes through the rom window */ 61 pci_read_config_word(window->pdev, BIOS_CNTL, &word); 62 pci_write_config_word(window->pdev, BIOS_CNTL, word & ~1); 63 pci_dev_put(window->pdev); 64 65 /* Free all of the mtd devices */ 66 list_for_each_entry_safe(map, scratch, &window->maps, list) { 67 if (map->rsrc.parent) 68 release_resource(&map->rsrc); 69 del_mtd_device(map->mtd); 70 map_destroy(map->mtd); 71 list_del(&map->list); 72 kfree(map); 73 } 74 if (window->rsrc.parent) 75 release_resource(&window->rsrc); 76 if (window->virt) { 77 iounmap(window->virt); 78 window->virt = NULL; 79 window->phys = 0; 80 window->size = 0; 81 window->pdev = NULL; 82 } 83 } 84 85 86 static int __devinit ichxrom_init_one (struct pci_dev *pdev, 87 const struct pci_device_id *ent) 88 { 89 static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL }; 90 struct ichxrom_window *window = &ichxrom_window; 91 struct ichxrom_map_info *map = NULL; 92 unsigned long map_top; 93 u8 byte; 94 u16 word; 95 96 /* For now I just handle the ichx and I assume there 97 * are not a lot of resources up at the top of the address 98 * space. It is possible to handle other devices in the 99 * top 16MB but it is very painful. Also since 100 * you can only really attach a FWH to an ICHX there 101 * a number of simplifications you can make. 102 * 103 * Also you can page firmware hubs if an 8MB window isn't enough 104 * but don't currently handle that case either. 105 */ 106 window->pdev = pdev; 107 108 /* Find a region continuous to the end of the ROM window */ 109 window->phys = 0; 110 pci_read_config_byte(pdev, FWH_DEC_EN1, &byte); 111 if (byte == 0xff) { 112 window->phys = 0xffc00000; 113 pci_read_config_byte(pdev, FWH_DEC_EN2, &byte); 114 if ((byte & 0x0f) == 0x0f) { 115 window->phys = 0xff400000; 116 } 117 else if ((byte & 0x0e) == 0x0e) { 118 window->phys = 0xff500000; 119 } 120 else if ((byte & 0x0c) == 0x0c) { 121 window->phys = 0xff600000; 122 } 123 else if ((byte & 0x08) == 0x08) { 124 window->phys = 0xff700000; 125 } 126 } 127 else if ((byte & 0xfe) == 0xfe) { 128 window->phys = 0xffc80000; 129 } 130 else if ((byte & 0xfc) == 0xfc) { 131 window->phys = 0xffd00000; 132 } 133 else if ((byte & 0xf8) == 0xf8) { 134 window->phys = 0xffd80000; 135 } 136 else if ((byte & 0xf0) == 0xf0) { 137 window->phys = 0xffe00000; 138 } 139 else if ((byte & 0xe0) == 0xe0) { 140 window->phys = 0xffe80000; 141 } 142 else if ((byte & 0xc0) == 0xc0) { 143 window->phys = 0xfff00000; 144 } 145 else if ((byte & 0x80) == 0x80) { 146 window->phys = 0xfff80000; 147 } 148 149 if (window->phys == 0) { 150 printk(KERN_ERR MOD_NAME ": Rom window is closed\n"); 151 goto out; 152 } 153 window->phys -= 0x400000UL; 154 window->size = (0xffffffffUL - window->phys) + 1UL; 155 156 /* Enable writes through the rom window */ 157 pci_read_config_word(pdev, BIOS_CNTL, &word); 158 if (!(word & 1) && (word & (1<<1))) { 159 /* The BIOS will generate an error if I enable 160 * this device, so don't even try. 161 */ 162 printk(KERN_ERR MOD_NAME ": firmware access control, I can't enable writes\n"); 163 goto out; 164 } 165 pci_write_config_word(pdev, BIOS_CNTL, word | 1); 166 167 /* 168 * Try to reserve the window mem region. If this fails then 169 * it is likely due to the window being "reseved" by the BIOS. 170 */ 171 window->rsrc.name = MOD_NAME; 172 window->rsrc.start = window->phys; 173 window->rsrc.end = window->phys + window->size - 1; 174 window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; 175 if (request_resource(&iomem_resource, &window->rsrc)) { 176 window->rsrc.parent = NULL; 177 printk(KERN_DEBUG MOD_NAME 178 ": %s(): Unable to register resource" 179 " 0x%.16llx-0x%.16llx - kernel bug?\n", 180 __func__, 181 (unsigned long long)window->rsrc.start, 182 (unsigned long long)window->rsrc.end); 183 } 184 185 /* Map the firmware hub into my address space. */ 186 window->virt = ioremap_nocache(window->phys, window->size); 187 if (!window->virt) { 188 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n", 189 window->phys, window->size); 190 goto out; 191 } 192 193 /* Get the first address to look for an rom chip at */ 194 map_top = window->phys; 195 if ((window->phys & 0x3fffff) != 0) { 196 map_top = window->phys + 0x400000; 197 } 198 #if 1 199 /* The probe sequence run over the firmware hub lock 200 * registers sets them to 0x7 (no access). 201 * Probe at most the last 4M of the address space. 202 */ 203 if (map_top < 0xffc00000) { 204 map_top = 0xffc00000; 205 } 206 #endif 207 /* Loop through and look for rom chips */ 208 while((map_top - 1) < 0xffffffffUL) { 209 struct cfi_private *cfi; 210 unsigned long offset; 211 int i; 212 213 if (!map) { 214 map = kmalloc(sizeof(*map), GFP_KERNEL); 215 } 216 if (!map) { 217 printk(KERN_ERR MOD_NAME ": kmalloc failed"); 218 goto out; 219 } 220 memset(map, 0, sizeof(*map)); 221 INIT_LIST_HEAD(&map->list); 222 map->map.name = map->map_name; 223 map->map.phys = map_top; 224 offset = map_top - window->phys; 225 map->map.virt = (void __iomem *) 226 (((unsigned long)(window->virt)) + offset); 227 map->map.size = 0xffffffffUL - map_top + 1UL; 228 /* Set the name of the map to the address I am trying */ 229 sprintf(map->map_name, "%s @%08Lx", 230 MOD_NAME, (unsigned long long)map->map.phys); 231 232 /* Firmware hubs only use vpp when being programmed 233 * in a factory setting. So in-place programming 234 * needs to use a different method. 235 */ 236 for(map->map.bankwidth = 32; map->map.bankwidth; 237 map->map.bankwidth >>= 1) 238 { 239 char **probe_type; 240 /* Skip bankwidths that are not supported */ 241 if (!map_bankwidth_supported(map->map.bankwidth)) 242 continue; 243 244 /* Setup the map methods */ 245 simple_map_init(&map->map); 246 247 /* Try all of the probe methods */ 248 probe_type = rom_probe_types; 249 for(; *probe_type; probe_type++) { 250 map->mtd = do_map_probe(*probe_type, &map->map); 251 if (map->mtd) 252 goto found; 253 } 254 } 255 map_top += ROM_PROBE_STEP_SIZE; 256 continue; 257 found: 258 /* Trim the size if we are larger than the map */ 259 if (map->mtd->size > map->map.size) { 260 printk(KERN_WARNING MOD_NAME 261 " rom(%u) larger than window(%lu). fixing...\n", 262 map->mtd->size, map->map.size); 263 map->mtd->size = map->map.size; 264 } 265 if (window->rsrc.parent) { 266 /* 267 * Registering the MTD device in iomem may not be possible 268 * if there is a BIOS "reserved" and BUSY range. If this 269 * fails then continue anyway. 270 */ 271 map->rsrc.name = map->map_name; 272 map->rsrc.start = map->map.phys; 273 map->rsrc.end = map->map.phys + map->mtd->size - 1; 274 map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; 275 if (request_resource(&window->rsrc, &map->rsrc)) { 276 printk(KERN_ERR MOD_NAME 277 ": cannot reserve MTD resource\n"); 278 map->rsrc.parent = NULL; 279 } 280 } 281 282 /* Make the whole region visible in the map */ 283 map->map.virt = window->virt; 284 map->map.phys = window->phys; 285 cfi = map->map.fldrv_priv; 286 for(i = 0; i < cfi->numchips; i++) { 287 cfi->chips[i].start += offset; 288 } 289 290 /* Now that the mtd devices is complete claim and export it */ 291 map->mtd->owner = THIS_MODULE; 292 if (add_mtd_device(map->mtd)) { 293 map_destroy(map->mtd); 294 map->mtd = NULL; 295 goto out; 296 } 297 298 299 /* Calculate the new value of map_top */ 300 map_top += map->mtd->size; 301 302 /* File away the map structure */ 303 list_add(&map->list, &window->maps); 304 map = NULL; 305 } 306 307 out: 308 /* Free any left over map structures */ 309 kfree(map); 310 311 /* See if I have any map structures */ 312 if (list_empty(&window->maps)) { 313 ichxrom_cleanup(window); 314 return -ENODEV; 315 } 316 return 0; 317 } 318 319 320 static void __devexit ichxrom_remove_one (struct pci_dev *pdev) 321 { 322 struct ichxrom_window *window = &ichxrom_window; 323 ichxrom_cleanup(window); 324 } 325 326 static struct pci_device_id ichxrom_pci_tbl[] __devinitdata = { 327 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0, 328 PCI_ANY_ID, PCI_ANY_ID, }, 329 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0, 330 PCI_ANY_ID, PCI_ANY_ID, }, 331 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0, 332 PCI_ANY_ID, PCI_ANY_ID, }, 333 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0, 334 PCI_ANY_ID, PCI_ANY_ID, }, 335 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1, 336 PCI_ANY_ID, PCI_ANY_ID, }, 337 { 0, }, 338 }; 339 340 #if 0 341 MODULE_DEVICE_TABLE(pci, ichxrom_pci_tbl); 342 343 static struct pci_driver ichxrom_driver = { 344 .name = MOD_NAME, 345 .id_table = ichxrom_pci_tbl, 346 .probe = ichxrom_init_one, 347 .remove = ichxrom_remove_one, 348 }; 349 #endif 350 351 static int __init init_ichxrom(void) 352 { 353 struct pci_dev *pdev; 354 struct pci_device_id *id; 355 356 pdev = NULL; 357 for (id = ichxrom_pci_tbl; id->vendor; id++) { 358 pdev = pci_get_device(id->vendor, id->device, NULL); 359 if (pdev) { 360 break; 361 } 362 } 363 if (pdev) { 364 return ichxrom_init_one(pdev, &ichxrom_pci_tbl[0]); 365 } 366 return -ENXIO; 367 #if 0 368 return pci_register_driver(&ichxrom_driver); 369 #endif 370 } 371 372 static void __exit cleanup_ichxrom(void) 373 { 374 ichxrom_remove_one(ichxrom_window.pdev); 375 } 376 377 module_init(init_ichxrom); 378 module_exit(cleanup_ichxrom); 379 380 MODULE_LICENSE("GPL"); 381 MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>"); 382 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the ICHX southbridge"); 383