drivers/mtd/maps/tqm8xxl.c

   1 /*
   2  * Handle mapping of the flash memory access routines
   3  * on TQM8xxL based devices.
   4  *
   5  * based on rpxlite.c
   6  *
   7  * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
   8  *
   9  * This code is GPLed
  10  *
  11  */
  12
  13 /*
  14  * According to TQM8xxL hardware manual, TQM8xxL series have
  15  * following flash memory organisations:
  16  *      | capacity |    | chip type |   | bank0 |       | bank1 |
  17  *          2MiB           512Kx16        2MiB             0
  18  *          4MiB           1Mx16          4MiB             0
  19  *          8MiB           1Mx16          4MiB             4MiB
  20  * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at
  21  * kernel configuration.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/types.h>
  25 #include <linux/kernel.h>
  26 #include <linux/init.h>
  27 #include <linux/slab.h>
  28
  29 #include <linux/mtd/mtd.h>
  30 #include <linux/mtd/map.h>
  31 #include <linux/mtd/partitions.h>
  32
  33 #include <asm/io.h>
  34
  35 #define FLASH_ADDR 0x40000000
  36 #define FLASH_SIZE 0x00800000
  37 #define FLASH_BANK_MAX 4
  38
  39 // trivial struct to describe partition information
  40 struct mtd_part_def
  41 {
  42         int nums;
  43         unsigned char *type;
  44         struct mtd_partition* mtd_part;
  45 };
  46
  47 //static struct mtd_info *mymtd;
  48 static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
  49 static struct map_info* map_banks[FLASH_BANK_MAX];
  50 static struct mtd_part_def part_banks[FLASH_BANK_MAX];
  51 static unsigned long num_banks;
  52 static void __iomem *start_scan_addr;
  53
  54 /*
  55  * Here are partition information for all known TQM8xxL series devices.
  56  * See include/linux/mtd/partitions.h for definition of the mtd_partition
  57  * structure.
  58  *
  59  * The *_max_flash_size is the maximum possible mapped flash size which
  60  * is not necessarily the actual flash size.  It must correspond to the
  61  * value specified in the mapping definition defined by the
  62  * "struct map_desc *_io_desc" for the corresponding machine.
  63  */
  64
  65 #ifdef CONFIG_MTD_PARTITIONS
  66 /* Currently, TQM8xxL has up to 8MiB flash */
  67 static unsigned long tqm8xxl_max_flash_size = 0x00800000;
  68
  69 /* partition definition for first flash bank
  70  * (cf. "drivers/char/flash_config.c")
  71  */
  72 static struct mtd_partition tqm8xxl_partitions[] = {
  73         {
  74           .name = "ppcboot",
  75           .offset = 0x00000000,
  76           .size = 0x00020000,           /* 128KB           */
  77           .mask_flags = MTD_WRITEABLE,  /* force read-only */
  78         },
  79         {
  80           .name = "kernel",             /* default kernel image */
  81           .offset = 0x00020000,
  82           .size = 0x000e0000,
  83           .mask_flags = MTD_WRITEABLE,  /* force read-only */
  84         },
  85         {
  86           .name = "user",
  87           .offset = 0x00100000,
  88           .size = 0x00100000,
  89         },
  90         {
  91           .name = "initrd",
  92           .offset = 0x00200000,
  93           .size = 0x00200000,
  94         }
  95 };
  96 /* partition definition for second flash bank */
  97 static struct mtd_partition tqm8xxl_fs_partitions[] = {
  98         {
  99           .name = "cramfs",
 100           .offset = 0x00000000,
 101           .size = 0x00200000,
 102         },
 103         {
 104           .name = "jffs",
 105           .offset = 0x00200000,
 106           .size = 0x00200000,
 107           //.size = MTDPART_SIZ_FULL,
 108         }
 109 };
 110 #endif
 111
 112 static int __init init_tqm_mtd(void)
 113 {
 114         int idx = 0, ret = 0;
 115         unsigned long flash_addr, flash_size, mtd_size = 0;
 116         /* pointer to TQM8xxL board info data */
 117         bd_t *bd = (bd_t *)__res;
 118
 119         flash_addr = bd->bi_flashstart;
 120         flash_size = bd->bi_flashsize;
 121
 122         //request maximum flash size address space
 123         start_scan_addr = ioremap(flash_addr, flash_size);
 124         if (!start_scan_addr) {
 125                 printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __func__, flash_addr);
 126                 return -EIO;
 127         }
 128
 129         for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 130                 if(mtd_size >= flash_size)
 131                         break;
 132
 133                 printk(KERN_INFO "%s: chip probing count %d\n", __func__, idx);
 134
 135                 map_banks[idx] = kzalloc(sizeof(struct map_info), GFP_KERNEL);
 136                 if(map_banks[idx] == NULL) {
 137                         ret = -ENOMEM;
 138                         /* FIXME: What if some MTD devices were probed already? */
 139                         goto error_mem;
 140                 }
 141
 142                 map_banks[idx]->name = kmalloc(16, GFP_KERNEL);
 143
 144                 if (!map_banks[idx]->name) {
 145                         ret = -ENOMEM;
 146                         /* FIXME: What if some MTD devices were probed already? */
 147                         goto error_mem;
 148                 }
 149                 sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);
 150
 151                 map_banks[idx]->size = flash_size;
 152                 map_banks[idx]->bankwidth = 4;
 153
 154                 simple_map_init(map_banks[idx]);
 155
 156                 map_banks[idx]->virt = start_scan_addr;
 157                 map_banks[idx]->phys = flash_addr;
 158                 /* FIXME: This looks utterly bogus, but I'm trying to
 159                    preserve the behaviour of the original (shown here)...
 160
 161                 map_banks[idx]->map_priv_1 =
 162                 start_scan_addr + ((idx > 0) ?
 163                 (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
 164                 */
 165
 166                 if (idx && mtd_banks[idx-1]) {
 167                         map_banks[idx]->virt += mtd_banks[idx-1]->size;
 168                         map_banks[idx]->phys += mtd_banks[idx-1]->size;
 169                 }
 170
 171                 //start to probe flash chips
 172                 mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
 173
 174                 if (mtd_banks[idx]) {
 175                         mtd_banks[idx]->owner = THIS_MODULE;
 176                         mtd_size += mtd_banks[idx]->size;
 177                         num_banks++;
 178
 179                         printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __func__, num_banks,
 180                         mtd_banks[idx]->name, mtd_banks[idx]->size);
 181                 }
 182         }
 183
 184         /* no supported flash chips found */
 185         if (!num_banks) {
 186                 printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
 187                 ret = -ENXIO;
 188                 goto error_mem;
 189         }
 190
 191 #ifdef CONFIG_MTD_PARTITIONS
 192         /*
 193          * Select Static partition definitions
 194          */
 195         part_banks[0].mtd_part = tqm8xxl_partitions;
 196         part_banks[0].type = "Static image";
 197         part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
 198
 199         part_banks[1].mtd_part = tqm8xxl_fs_partitions;
 200         part_banks[1].type = "Static file system";
 201         part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);
 202
 203         for(idx = 0; idx < num_banks ; idx++) {
 204                 if (part_banks[idx].nums == 0) {
 205                         printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
 206                         add_mtd_device(mtd_banks[idx]);
 207                 } else {
 208                         printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
 209                                         idx, part_banks[idx].type);
 210                         add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part,
 211                                                                 part_banks[idx].nums);
 212                 }
 213         }
 214 #else
 215         printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
 216         for(idx = 0 ; idx < num_banks ; idx++)
 217                 add_mtd_device(mtd_banks[idx]);
 218 #endif
 219         return 0;
 220 error_mem:
 221         for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 222                 if(map_banks[idx] != NULL) {
 223                         kfree(map_banks[idx]->name);
 224                         map_banks[idx]->name = NULL;
 225                         kfree(map_banks[idx]);
 226                         map_banks[idx] = NULL;
 227                 }
 228         }
 229 error:
 230         iounmap(start_scan_addr);
 231         return ret;
 232 }
 233
 234 static void __exit cleanup_tqm_mtd(void)
 235 {
 236         unsigned int idx = 0;
 237         for(idx = 0 ; idx < num_banks ; idx++) {
 238                 /* destroy mtd_info previously allocated */
 239                 if (mtd_banks[idx]) {
 240                         del_mtd_partitions(mtd_banks[idx]);
 241                         map_destroy(mtd_banks[idx]);
 242                 }
 243                 /* release map_info not used anymore */
 244                 kfree(map_banks[idx]->name);
 245                 kfree(map_banks[idx]);
 246         }
 247
 248         if (start_scan_addr) {
 249                 iounmap(start_scan_addr);
 250                 start_scan_addr = 0;
 251         }
 252 }
 253
 254 module_init(init_tqm_mtd);
 255 module_exit(cleanup_tqm_mtd);
 256
 257 MODULE_LICENSE("GPL");
 258 MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
 259 MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");