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 pci_dev_put(window->pdev); 61 } 62 63 /* Free all of the mtd devices */ 64 list_for_each_entry_safe(map, scratch, &window->maps, list) { 65 if (map->rsrc.parent) { 66 release_resource(&map->rsrc); 67 } 68 del_mtd_device(map->mtd); 69 map_destroy(map->mtd); 70 list_del(&map->list); 71 kfree(map); 72 } 73 if (window->rsrc.parent) 74 release_resource(&window->rsrc); 75 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 amd76xrom_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 u8 byte; 91 struct amd76xrom_window *window = &amd76xrom_window; 92 struct amd76xrom_map_info *map = NULL; 93 unsigned long map_top; 94 95 /* Remember the pci dev I find the window in - already have a ref */ 96 window->pdev = pdev; 97 98 /* Assume the rom window is properly setup, and find it's size */ 99 pci_read_config_byte(pdev, 0x43, &byte); 100 if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) { 101 window->phys = 0xffb00000; /* 5MiB */ 102 } 103 else if ((byte & (1<<7)) == (1<<7)) { 104 window->phys = 0xffc00000; /* 4MiB */ 105 } 106 else { 107 window->phys = 0xffff0000; /* 64KiB */ 108 } 109 window->size = 0xffffffffUL - window->phys + 1UL; 110 111 /* 112 * Try to reserve the window mem region. If this fails then 113 * it is likely due to a fragment of the window being 114 * "reseved" by the BIOS. In the case that the 115 * request_mem_region() fails then once the rom size is 116 * discovered we will try to reserve the unreserved fragment. 117 */ 118 window->rsrc.name = MOD_NAME; 119 window->rsrc.start = window->phys; 120 window->rsrc.end = window->phys + window->size - 1; 121 window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; 122 if (request_resource(&iomem_resource, &window->rsrc)) { 123 window->rsrc.parent = NULL; 124 printk(KERN_ERR MOD_NAME 125 " %s(): Unable to register resource" 126 " 0x%.16llx-0x%.16llx - kernel bug?\n", 127 __func__, 128 (unsigned long long)window->rsrc.start, 129 (unsigned long long)window->rsrc.end); 130 } 131 132 #if 0 133 134 /* Enable the selected rom window */ 135 pci_read_config_byte(pdev, 0x43, &byte); 136 pci_write_config_byte(pdev, 0x43, byte | rwindow->segen_bits); 137 #endif 138 139 /* Enable writes through the rom window */ 140 pci_read_config_byte(pdev, 0x40, &byte); 141 pci_write_config_byte(pdev, 0x40, byte | 1); 142 143 /* FIXME handle registers 0x80 - 0x8C the bios region locks */ 144 145 /* For write accesses caches are useless */ 146 window->virt = ioremap_nocache(window->phys, window->size); 147 if (!window->virt) { 148 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n", 149 window->phys, window->size); 150 goto out; 151 } 152 153 /* Get the first address to look for an rom chip at */ 154 map_top = window->phys; 155 #if 1 156 /* The probe sequence run over the firmware hub lock 157 * registers sets them to 0x7 (no access). 158 * Probe at most the last 4M of the address space. 159 */ 160 if (map_top < 0xffc00000) { 161 map_top = 0xffc00000; 162 } 163 #endif 164 /* Loop through and look for rom chips */ 165 while((map_top - 1) < 0xffffffffUL) { 166 struct cfi_private *cfi; 167 unsigned long offset; 168 int i; 169 170 if (!map) { 171 map = kmalloc(sizeof(*map), GFP_KERNEL); 172 } 173 if (!map) { 174 printk(KERN_ERR MOD_NAME ": kmalloc failed"); 175 goto out; 176 } 177 memset(map, 0, sizeof(*map)); 178 INIT_LIST_HEAD(&map->list); 179 map->map.name = map->map_name; 180 map->map.phys = map_top; 181 offset = map_top - window->phys; 182 map->map.virt = (void __iomem *) 183 (((unsigned long)(window->virt)) + offset); 184 map->map.size = 0xffffffffUL - map_top + 1UL; 185 /* Set the name of the map to the address I am trying */ 186 sprintf(map->map_name, "%s @%08lx", 187 MOD_NAME, map->map.phys); 188 189 /* There is no generic VPP support */ 190 for(map->map.bankwidth = 32; map->map.bankwidth; 191 map->map.bankwidth >>= 1) 192 { 193 char **probe_type; 194 /* Skip bankwidths that are not supported */ 195 if (!map_bankwidth_supported(map->map.bankwidth)) 196 continue; 197 198 /* Setup the map methods */ 199 simple_map_init(&map->map); 200 201 /* Try all of the probe methods */ 202 probe_type = rom_probe_types; 203 for(; *probe_type; probe_type++) { 204 map->mtd = do_map_probe(*probe_type, &map->map); 205 if (map->mtd) 206 goto found; 207 } 208 } 209 map_top += ROM_PROBE_STEP_SIZE; 210 continue; 211 found: 212 /* Trim the size if we are larger than the map */ 213 if (map->mtd->size > map->map.size) { 214 printk(KERN_WARNING MOD_NAME 215 " rom(%u) larger than window(%lu). fixing...\n", 216 map->mtd->size, map->map.size); 217 map->mtd->size = map->map.size; 218 } 219 if (window->rsrc.parent) { 220 /* 221 * Registering the MTD device in iomem may not be possible 222 * if there is a BIOS "reserved" and BUSY range. If this 223 * fails then continue anyway. 224 */ 225 map->rsrc.name = map->map_name; 226 map->rsrc.start = map->map.phys; 227 map->rsrc.end = map->map.phys + map->mtd->size - 1; 228 map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; 229 if (request_resource(&window->rsrc, &map->rsrc)) { 230 printk(KERN_ERR MOD_NAME 231 ": cannot reserve MTD resource\n"); 232 map->rsrc.parent = NULL; 233 } 234 } 235 236 /* Make the whole region visible in the map */ 237 map->map.virt = window->virt; 238 map->map.phys = window->phys; 239 cfi = map->map.fldrv_priv; 240 for(i = 0; i < cfi->numchips; i++) { 241 cfi->chips[i].start += offset; 242 } 243 244 /* Now that the mtd devices is complete claim and export it */ 245 map->mtd->owner = THIS_MODULE; 246 if (add_mtd_device(map->mtd)) { 247 map_destroy(map->mtd); 248 map->mtd = NULL; 249 goto out; 250 } 251 252 253 /* Calculate the new value of map_top */ 254 map_top += map->mtd->size; 255 256 /* File away the map structure */ 257 list_add(&map->list, &window->maps); 258 map = NULL; 259 } 260 261 out: 262 /* Free any left over map structures */ 263 kfree(map); 264 /* See if I have any map structures */ 265 if (list_empty(&window->maps)) { 266 amd76xrom_cleanup(window); 267 return -ENODEV; 268 } 269 return 0; 270 } 271 272 273 static void __devexit amd76xrom_remove_one (struct pci_dev *pdev) 274 { 275 struct amd76xrom_window *window = &amd76xrom_window; 276 277 amd76xrom_cleanup(window); 278 } 279 280 static struct pci_device_id amd76xrom_pci_tbl[] = { 281 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410, 282 PCI_ANY_ID, PCI_ANY_ID, }, 283 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440, 284 PCI_ANY_ID, PCI_ANY_ID, }, 285 { PCI_VENDOR_ID_AMD, 0x7468 }, /* amd8111 support */ 286 { 0, } 287 }; 288 289 MODULE_DEVICE_TABLE(pci, amd76xrom_pci_tbl); 290 291 #if 0 292 static struct pci_driver amd76xrom_driver = { 293 .name = MOD_NAME, 294 .id_table = amd76xrom_pci_tbl, 295 .probe = amd76xrom_init_one, 296 .remove = amd76xrom_remove_one, 297 }; 298 #endif 299 300 static int __init init_amd76xrom(void) 301 { 302 struct pci_dev *pdev; 303 struct pci_device_id *id; 304 pdev = NULL; 305 for(id = amd76xrom_pci_tbl; id->vendor; id++) { 306 pdev = pci_get_device(id->vendor, id->device, NULL); 307 if (pdev) { 308 break; 309 } 310 } 311 if (pdev) { 312 return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]); 313 } 314 return -ENXIO; 315 #if 0 316 return pci_register_driver(&amd76xrom_driver); 317 #endif 318 } 319 320 static void __exit cleanup_amd76xrom(void) 321 { 322 amd76xrom_remove_one(amd76xrom_window.pdev); 323 } 324 325 module_init(init_amd76xrom); 326 module_exit(cleanup_amd76xrom); 327 328 MODULE_LICENSE("GPL"); 329 MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>"); 330 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD76X southbridge"); 331 332