1 /* 2 * amd76xrom.c 3 * 4 * Normal mappings of chips in physical memory 5 * $Id: amd76xrom.c,v 1.21 2005/11/07 11:14:26 gleixner Exp $ 6 */ 7 8 #include <linux/module.h> 9 #include <linux/types.h> 10 #include <linux/kernel.h> 11 #include <linux/init.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 static struct amd76xrom_window amd76xrom_window = { 48 .maps = LIST_HEAD_INIT(amd76xrom_window.maps), 49 }; 50 51 static void amd76xrom_cleanup(struct amd76xrom_window *window) 52 { 53 struct amd76xrom_map_info *map, *scratch; 54 u8 byte; 55 56 if (window->pdev) { 57 /* Disable writes through the rom window */ 58 pci_read_config_byte(window->pdev, 0x40, &byte); 59 pci_write_config_byte(window->pdev, 0x40, byte & ~1); 60 } 61 62 /* Free all of the mtd devices */ 63 list_for_each_entry_safe(map, scratch, &window->maps, list) { 64 if (map->rsrc.parent) { 65 release_resource(&map->rsrc); 66 } 67 del_mtd_device(map->mtd); 68 map_destroy(map->mtd); 69 list_del(&map->list); 70 kfree(map); 71 } 72 if (window->rsrc.parent) 73 release_resource(&window->rsrc); 74 75 if (window->virt) { 76 iounmap(window->virt); 77 window->virt = NULL; 78 window->phys = 0; 79 window->size = 0; 80 window->pdev = NULL; 81 } 82 } 83 84 85 static int __devinit amd76xrom_init_one (struct pci_dev *pdev, 86 const struct pci_device_id *ent) 87 { 88 static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL }; 89 u8 byte; 90 struct amd76xrom_window *window = &amd76xrom_window; 91 struct amd76xrom_map_info *map = NULL; 92 unsigned long map_top; 93 94 /* Remember the pci dev I find the window in */ 95 window->pdev = pdev; 96 97 /* Assume the rom window is properly setup, and find it's size */ 98 pci_read_config_byte(pdev, 0x43, &byte); 99 if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) { 100 window->phys = 0xffb00000; /* 5MiB */ 101 } 102 else if ((byte & (1<<7)) == (1<<7)) { 103 window->phys = 0xffc00000; /* 4MiB */ 104 } 105 else { 106 window->phys = 0xffff0000; /* 64KiB */ 107 } 108 window->size = 0xffffffffUL - window->phys + 1UL; 109 110 /* 111 * Try to reserve the window mem region. If this fails then 112 * it is likely due to a fragment of the window being 113 * "reseved" by the BIOS. In the case that the 114 * request_mem_region() fails then once the rom size is 115 * discovered we will try to reserve the unreserved fragment. 116 */ 117 window->rsrc.name = MOD_NAME; 118 window->rsrc.start = window->phys; 119 window->rsrc.end = window->phys + window->size - 1; 120 window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; 121 if (request_resource(&iomem_resource, &window->rsrc)) { 122 window->rsrc.parent = NULL; 123 printk(KERN_ERR MOD_NAME 124 " %s(): Unable to register resource" 125 " 0x%.16llx-0x%.16llx - kernel bug?\n", 126 __func__, 127 (unsigned long long)window->rsrc.start, 128 (unsigned long long)window->rsrc.end); 129 } 130 131 #if 0 132 133 /* Enable the selected rom window */ 134 pci_read_config_byte(pdev, 0x43, &byte); 135 pci_write_config_byte(pdev, 0x43, byte | rwindow->segen_bits); 136 #endif 137 138 /* Enable writes through the rom window */ 139 pci_read_config_byte(pdev, 0x40, &byte); 140 pci_write_config_byte(pdev, 0x40, byte | 1); 141 142 /* FIXME handle registers 0x80 - 0x8C the bios region locks */ 143 144 /* For write accesses caches are useless */ 145 window->virt = ioremap_nocache(window->phys, window->size); 146 if (!window->virt) { 147 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n", 148 window->phys, window->size); 149 goto out; 150 } 151 152 /* Get the first address to look for an rom chip at */ 153 map_top = window->phys; 154 #if 1 155 /* The probe sequence run over the firmware hub lock 156 * registers sets them to 0x7 (no access). 157 * Probe at most the last 4M of the address space. 158 */ 159 if (map_top < 0xffc00000) { 160 map_top = 0xffc00000; 161 } 162 #endif 163 /* Loop through and look for rom chips */ 164 while((map_top - 1) < 0xffffffffUL) { 165 struct cfi_private *cfi; 166 unsigned long offset; 167 int i; 168 169 if (!map) { 170 map = kmalloc(sizeof(*map), GFP_KERNEL); 171 } 172 if (!map) { 173 printk(KERN_ERR MOD_NAME ": kmalloc failed"); 174 goto out; 175 } 176 memset(map, 0, sizeof(*map)); 177 INIT_LIST_HEAD(&map->list); 178 map->map.name = map->map_name; 179 map->map.phys = map_top; 180 offset = map_top - window->phys; 181 map->map.virt = (void __iomem *) 182 (((unsigned long)(window->virt)) + offset); 183 map->map.size = 0xffffffffUL - map_top + 1UL; 184 /* Set the name of the map to the address I am trying */ 185 sprintf(map->map_name, "%s @%08lx", 186 MOD_NAME, map->map.phys); 187 188 /* There is no generic VPP support */ 189 for(map->map.bankwidth = 32; map->map.bankwidth; 190 map->map.bankwidth >>= 1) 191 { 192 char **probe_type; 193 /* Skip bankwidths that are not supported */ 194 if (!map_bankwidth_supported(map->map.bankwidth)) 195 continue; 196 197 /* Setup the map methods */ 198 simple_map_init(&map->map); 199 200 /* Try all of the probe methods */ 201 probe_type = rom_probe_types; 202 for(; *probe_type; probe_type++) { 203 map->mtd = do_map_probe(*probe_type, &map->map); 204 if (map->mtd) 205 goto found; 206 } 207 } 208 map_top += ROM_PROBE_STEP_SIZE; 209 continue; 210 found: 211 /* Trim the size if we are larger than the map */ 212 if (map->mtd->size > map->map.size) { 213 printk(KERN_WARNING MOD_NAME 214 " rom(%u) larger than window(%lu). fixing...\n", 215 map->mtd->size, map->map.size); 216 map->mtd->size = map->map.size; 217 } 218 if (window->rsrc.parent) { 219 /* 220 * Registering the MTD device in iomem may not be possible 221 * if there is a BIOS "reserved" and BUSY range. If this 222 * fails then continue anyway. 223 */ 224 map->rsrc.name = map->map_name; 225 map->rsrc.start = map->map.phys; 226 map->rsrc.end = map->map.phys + map->mtd->size - 1; 227 map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; 228 if (request_resource(&window->rsrc, &map->rsrc)) { 229 printk(KERN_ERR MOD_NAME 230 ": cannot reserve MTD resource\n"); 231 map->rsrc.parent = NULL; 232 } 233 } 234 235 /* Make the whole region visible in the map */ 236 map->map.virt = window->virt; 237 map->map.phys = window->phys; 238 cfi = map->map.fldrv_priv; 239 for(i = 0; i < cfi->numchips; i++) { 240 cfi->chips[i].start += offset; 241 } 242 243 /* Now that the mtd devices is complete claim and export it */ 244 map->mtd->owner = THIS_MODULE; 245 if (add_mtd_device(map->mtd)) { 246 map_destroy(map->mtd); 247 map->mtd = NULL; 248 goto out; 249 } 250 251 252 /* Calculate the new value of map_top */ 253 map_top += map->mtd->size; 254 255 /* File away the map structure */ 256 list_add(&map->list, &window->maps); 257 map = NULL; 258 } 259 260 out: 261 /* Free any left over map structures */ 262 kfree(map); 263 /* See if I have any map structures */ 264 if (list_empty(&window->maps)) { 265 amd76xrom_cleanup(window); 266 return -ENODEV; 267 } 268 return 0; 269 } 270 271 272 static void __devexit amd76xrom_remove_one (struct pci_dev *pdev) 273 { 274 struct amd76xrom_window *window = &amd76xrom_window; 275 276 amd76xrom_cleanup(window); 277 } 278 279 static struct pci_device_id amd76xrom_pci_tbl[] = { 280 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410, 281 PCI_ANY_ID, PCI_ANY_ID, }, 282 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440, 283 PCI_ANY_ID, PCI_ANY_ID, }, 284 { PCI_VENDOR_ID_AMD, 0x7468 }, /* amd8111 support */ 285 { 0, } 286 }; 287 288 MODULE_DEVICE_TABLE(pci, amd76xrom_pci_tbl); 289 290 #if 0 291 static struct pci_driver amd76xrom_driver = { 292 .name = MOD_NAME, 293 .id_table = amd76xrom_pci_tbl, 294 .probe = amd76xrom_init_one, 295 .remove = amd76xrom_remove_one, 296 }; 297 #endif 298 299 static int __init init_amd76xrom(void) 300 { 301 struct pci_dev *pdev; 302 struct pci_device_id *id; 303 pdev = NULL; 304 for(id = amd76xrom_pci_tbl; id->vendor; id++) { 305 pdev = pci_find_device(id->vendor, id->device, NULL); 306 if (pdev) { 307 break; 308 } 309 } 310 if (pdev) { 311 return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]); 312 } 313 return -ENXIO; 314 #if 0 315 return pci_register_driver(&amd76xrom_driver); 316 #endif 317 } 318 319 static void __exit cleanup_amd76xrom(void) 320 { 321 amd76xrom_remove_one(amd76xrom_window.pdev); 322 } 323 324 module_init(init_amd76xrom); 325 module_exit(cleanup_amd76xrom); 326 327 MODULE_LICENSE("GPL"); 328 MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>"); 329 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD76X southbridge"); 330 331