drivers/mtd/maps/amd76xrom.c

   1 /*
   2  * amd76xrom.c
   3  *
   4  * Normal mappings of chips in physical memory
   5  * $Id: amd76xrom.c,v 1.12 2004/07/14 14:44:31 thayne 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/config.h>
  16 #include <linux/pci.h>
  17 #include <linux/pci_ids.h>
  18
  19
  20 #define xstr(s) str(s)
  21 #define str(s) #s
  22 #define MOD_NAME xstr(KBUILD_BASENAME)
  23
  24 #define MTD_DEV_NAME_LENGTH 16
  25
  26 struct amd76xrom_map_info {
  27         struct map_info map;
  28         struct mtd_info *mtd;
  29         void __iomem * window_addr;
  30         u32 window_start, window_size;
  31         struct pci_dev *pdev;
  32         struct resource window_rsrc;
  33         struct resource rom_rsrc;
  34         char mtd_name[MTD_DEV_NAME_LENGTH];
  35 };
  36
  37
  38 static struct amd76xrom_map_info amd76xrom_map = {
  39         .map = {
  40                 .name = MOD_NAME,
  41                 .size = 0,
  42                 .bankwidth = 1,
  43         }
  44         /* remaining fields of structure are initialized to 0 */
  45 };
  46
  47
  48 static void amd76xrom_cleanup(struct amd76xrom_map_info *info)
  49 {
  50         u8 byte;
  51
  52         /* Disable writes through the rom window */
  53         pci_read_config_byte(info->pdev, 0x40, &byte);
  54         pci_write_config_byte(info->pdev, 0x40, byte & ~1);
  55
  56         if (info->mtd) {
  57                 del_mtd_device(info->mtd);
  58                 map_destroy(info->mtd);
  59                 info->mtd = NULL;
  60                 info->map.virt = NULL;
  61         }
  62         if (info->rom_rsrc.parent)
  63                 release_resource(&info->rom_rsrc);
  64         if (info->window_rsrc.parent)
  65                 release_resource(&info->window_rsrc);
  66
  67         if (info->window_addr) {
  68                 iounmap(info->window_addr);
  69                 info->window_addr = NULL;
  70         }
  71 }
  72
  73
  74 static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
  75         const struct pci_device_id *ent)
  76 {
  77         struct rom_window {
  78                 u32 start;
  79                 u32 size;
  80                 u8 segen_bits;
  81         };
  82         static struct rom_window rom_window[] = {
  83                 /*
  84                  * Need the 5MiB window for chips that have block lock/unlock
  85                  * registers located below 4MiB window.
  86                  */
  87                 { 0xffb00000, 5*1024*1024, (1<<7) | (1<<6), },
  88                 { 0xffc00000, 4*1024*1024, (1<<7), },
  89                 { 0xffff0000, 64*1024,     0 },
  90                 { 0         , 0,           0 },
  91         };
  92         static const u32 rom_probe_sizes[] = {
  93                 5*1024*1024, 4*1024*1024, 2*1024*1024, 1024*1024, 512*1024,
  94                 256*1024, 128*1024, 64*1024, 0};
  95         static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
  96         u8 byte;
  97         struct amd76xrom_map_info *info = &amd76xrom_map;
  98         struct rom_window *window;
  99         int i;
 100         u32 rom_size;
 101
 102         info->pdev = pdev;
 103         window = &rom_window[0];
 104
 105         while (window->size) {
 106                 /*
 107                  * Try to reserve the window mem region.  If this fails then
 108                  * it is likely due to a fragment of the window being
 109                  * "reseved" by the BIOS.  In the case that the
 110                  * request_mem_region() fails then once the rom size is
 111                  * discovered we will try to reserve the unreserved fragment.
 112                  */
 113                 info->window_rsrc.name = MOD_NAME;
 114                 info->window_rsrc.start = window->start;
 115                 info->window_rsrc.end = window->start + window->size - 1;
 116                 info->window_rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 117                 if (request_resource(&iomem_resource, &info->window_rsrc)) {
 118                         info->window_rsrc.parent = NULL;
 119                         printk(KERN_ERR MOD_NAME
 120                                " %s(): Unable to register resource"
 121                                " 0x%.08lx-0x%.08lx - kernel bug?\n",
 122                                __func__,
 123                                info->window_rsrc.start, info->window_rsrc.end);
 124                 }
 125
 126                 /* Enable the selected rom window */
 127                 pci_read_config_byte(pdev, 0x43, &byte);
 128                 pci_write_config_byte(pdev, 0x43, byte | window->segen_bits);
 129
 130                 /* Enable writes through the rom window */
 131                 pci_read_config_byte(pdev, 0x40, &byte);
 132                 pci_write_config_byte(pdev, 0x40, byte | 1);
 133
 134                 /* FIXME handle registers 0x80 - 0x8C the bios region locks */
 135
 136                 printk(KERN_NOTICE MOD_NAME " window : %x at %x\n",
 137                        window->size, window->start);
 138                 /* For write accesses caches are useless */
 139                 info->window_addr = ioremap_nocache(window->start,
 140                                                        window->size);
 141
 142                 if (!info->window_addr) {
 143                         printk(KERN_ERR "Failed to ioremap\n");
 144                         continue;
 145                 }
 146
 147                 info->mtd = NULL;
 148
 149                 for(i = 0; (rom_size = rom_probe_sizes[i]); i++) {
 150                         char **chip_type;
 151                         if (rom_size > window->size) {
 152                                 continue;
 153                         }
 154                         info->map.phys = window->start + window->size - rom_size;
 155                         info->map.virt =
 156                                 info->window_addr + window->size - rom_size;
 157                         info->map.size = rom_size;
 158                         simple_map_init(&info->map);
 159                         chip_type = rom_probe_types;
 160                         for(; !info->mtd && *chip_type; chip_type++) {
 161                                 info->mtd = do_map_probe(*chip_type, &amd76xrom_map.map);
 162                         }
 163                         if (info->mtd) goto found_mtd;
 164                 }
 165                 iounmap(info->window_addr);
 166                 info->window_addr = NULL;
 167
 168                 /* Disable writes through the rom window */
 169                 pci_read_config_byte(pdev, 0x40, &byte);
 170                 pci_write_config_byte(pdev, 0x40, byte & ~1);
 171
 172                 window++;
 173         }
 174         goto failed;
 175
 176  found_mtd:
 177         printk(KERN_NOTICE MOD_NAME " chip at offset: 0x%x\n",
 178                 window->size - rom_size);
 179
 180         info->mtd->owner = THIS_MODULE;
 181
 182         if (!info->window_rsrc.parent) {
 183                 /* failed to reserve entire window - try fragments */
 184                 info->window_rsrc.name = MOD_NAME;
 185                 info->window_rsrc.start = window->start;
 186                 info->window_rsrc.end = window->start + window->size - rom_size - 1;
 187                 info->window_rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 188                 if (request_resource(&iomem_resource, &info->window_rsrc)) {
 189                         printk(KERN_ERR MOD_NAME
 190                                ": cannot reserve window resource fragment\n");
 191 #if 0
 192                         /*
 193                          * The BIOS e820 usually reserves this so it isn't
 194                          * usually an error.
 195                          */
 196                         goto failed;
 197 #endif
 198                 }
 199         }
 200
 201         add_mtd_device(info->mtd);
 202         info->window_start = window->start;
 203         info->window_size = window->size;
 204
 205         if (info->window_rsrc.parent) {
 206                 /*
 207                  * Registering the MTD device in iomem may not be possible
 208                  * if there is a BIOS "reserved" and BUSY range.  If this
 209                  * fails then continue anyway.
 210                  */
 211                 snprintf(info->mtd_name, MTD_DEV_NAME_LENGTH,
 212                          "mtd%d", info->mtd->index);
 213
 214                 info->rom_rsrc.name = info->mtd_name;
 215                 info->rom_rsrc.start = window->start + window->size - rom_size;
 216                 info->rom_rsrc.end = window->start + window->size - 1;
 217                 info->rom_rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 218                 if (request_resource(&info->window_rsrc, &info->rom_rsrc)) {
 219                         printk(KERN_ERR MOD_NAME
 220                                ": cannot reserve MTD resource\n");
 221                         info->rom_rsrc.parent = NULL;
 222                 }
 223         }
 224
 225         return 0;
 226
 227  failed:
 228         amd76xrom_cleanup(info);
 229         return -ENODEV;
 230 }
 231
 232
 233 static void __devexit amd76xrom_remove_one (struct pci_dev *pdev)
 234 {
 235         struct amd76xrom_map_info *info = &amd76xrom_map;
 236
 237         amd76xrom_cleanup(info);
 238 }
 239
 240 static struct pci_device_id amd76xrom_pci_tbl[] = {
 241         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410,
 242                 PCI_ANY_ID, PCI_ANY_ID, },
 243         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440,
 244                 PCI_ANY_ID, PCI_ANY_ID, },
 245         { PCI_VENDOR_ID_AMD, 0x7468 }, /* amd8111 support */
 246         { 0, }
 247 };
 248
 249 MODULE_DEVICE_TABLE(pci, amd76xrom_pci_tbl);
 250
 251 #if 0
 252 static struct pci_driver amd76xrom_driver = {
 253         .name =         MOD_NAME,
 254         .id_table =     amd76xrom_pci_tbl,
 255         .probe =        amd76xrom_init_one,
 256         .remove =       amd76xrom_remove_one,
 257 };
 258 #endif
 259
 260 int __init init_amd76xrom(void)
 261 {
 262         struct pci_dev *pdev;
 263         struct pci_device_id *id;
 264         pdev = NULL;
 265         for(id = amd76xrom_pci_tbl; id->vendor; id++) {
 266                 pdev = pci_find_device(id->vendor, id->device, NULL);
 267                 if (pdev) {
 268                         break;
 269                 }
 270         }
 271         if (pdev) {
 272                 amd76xrom_map.pdev = pdev;
 273                 return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]);
 274         }
 275         return -ENXIO;
 276 #if 0
 277         return pci_module_init(&amd76xrom_driver);
 278 #endif
 279 }
 280
 281 static void __exit cleanup_amd76xrom(void)
 282 {
 283         amd76xrom_remove_one(amd76xrom_map.pdev);
 284 }
 285
 286 module_init(init_amd76xrom);
 287 module_exit(cleanup_amd76xrom);
 288
 289 MODULE_LICENSE("GPL");
 290 MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
 291 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD76X southbridge");
 292