drivers/mtd/maps/tqm8xxl.c

   1 /*
   2  * Handle mapping of the flash memory access routines
   3  * on TQM8xxL based devices.
   4  *
   5  * $Id: tqm8xxl.c,v 1.15 2005/11/07 11:14:28 gleixner Exp $
   6  *
   7  * based on rpxlite.c
   8  *
   9  * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
  10  *
  11  * This code is GPLed
  12  *
  13  */
  14
  15 /*
  16  * According to TQM8xxL hardware manual, TQM8xxL series have
  17  * following flash memory organisations:
  18  *      | capacity |    | chip type |   | bank0 |       | bank1 |
  19  *          2MiB           512Kx16        2MiB             0
  20  *          4MiB           1Mx16          4MiB             0
  21  *          8MiB           1Mx16          4MiB             4MiB
  22  * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at
  23  * kernel configuration.
  24  */
  25 #include <linux/module.h>
  26 #include <linux/types.h>
  27 #include <linux/kernel.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30
  31 #include <linux/mtd/mtd.h>
  32 #include <linux/mtd/map.h>
  33 #include <linux/mtd/partitions.h>
  34
  35 #include <asm/io.h>
  36
  37 #define FLASH_ADDR 0x40000000
  38 #define FLASH_SIZE 0x00800000
  39 #define FLASH_BANK_MAX 4
  40
  41 // trivial struct to describe partition information
  42 struct mtd_part_def
  43 {
  44         int nums;
  45         unsigned char *type;
  46         struct mtd_partition* mtd_part;
  47 };
  48
  49 //static struct mtd_info *mymtd;
  50 static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
  51 static struct map_info* map_banks[FLASH_BANK_MAX];
  52 static struct mtd_part_def part_banks[FLASH_BANK_MAX];
  53 static unsigned long num_banks;
  54 static void __iomem *start_scan_addr;
  55
  56 /*
  57  * Here are partition information for all known TQM8xxL series devices.
  58  * See include/linux/mtd/partitions.h for definition of the mtd_partition
  59  * structure.
  60  *
  61  * The *_max_flash_size is the maximum possible mapped flash size which
  62  * is not necessarily the actual flash size.  It must correspond to the
  63  * value specified in the mapping definition defined by the
  64  * "struct map_desc *_io_desc" for the corresponding machine.
  65  */
  66
  67 #ifdef CONFIG_MTD_PARTITIONS
  68 /* Currently, TQM8xxL has upto 8MiB flash */
  69 static unsigned long tqm8xxl_max_flash_size = 0x00800000;
  70
  71 /* partition definition for first flash bank
  72  * (cf. "drivers/char/flash_config.c")
  73  */
  74 static struct mtd_partition tqm8xxl_partitions[] = {
  75         {
  76           .name = "ppcboot",
  77           .offset = 0x00000000,
  78           .size = 0x00020000,           /* 128KB           */
  79           .mask_flags = MTD_WRITEABLE,  /* force read-only */
  80         },
  81         {
  82           .name = "kernel",             /* default kernel image */
  83           .offset = 0x00020000,
  84           .size = 0x000e0000,
  85           .mask_flags = MTD_WRITEABLE,  /* force read-only */
  86         },
  87         {
  88           .name = "user",
  89           .offset = 0x00100000,
  90           .size = 0x00100000,
  91         },
  92         {
  93           .name = "initrd",
  94           .offset = 0x00200000,
  95           .size = 0x00200000,
  96         }
  97 };
  98 /* partition definition for second flash bank */
  99 static struct mtd_partition tqm8xxl_fs_partitions[] = {
 100         {
 101           .name = "cramfs",
 102           .offset = 0x00000000,
 103           .size = 0x00200000,
 104         },
 105         {
 106           .name = "jffs",
 107           .offset = 0x00200000,
 108           .size = 0x00200000,
 109           //.size = MTDPART_SIZ_FULL,
 110         }
 111 };
 112 #endif
 113
 114 int __init init_tqm_mtd(void)
 115 {
 116         int idx = 0, ret = 0;
 117         unsigned long flash_addr, flash_size, mtd_size = 0;
 118         /* pointer to TQM8xxL board info data */
 119         bd_t *bd = (bd_t *)__res;
 120
 121         flash_addr = bd->bi_flashstart;
 122         flash_size = bd->bi_flashsize;
 123
 124         //request maximum flash size address space
 125         start_scan_addr = ioremap(flash_addr, flash_size);
 126         if (!start_scan_addr) {
 127                 printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __FUNCTION__, flash_addr);
 128                 return -EIO;
 129         }
 130
 131         for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 132                 if(mtd_size >= flash_size)
 133                         break;
 134
 135                 printk(KERN_INFO "%s: chip probing count %d\n", __FUNCTION__, idx);
 136
 137                 map_banks[idx] = (struct map_info *)kmalloc(sizeof(struct map_info), GFP_KERNEL);
 138                 if(map_banks[idx] == NULL) {
 139                         ret = -ENOMEM;
 140                         /* FIXME: What if some MTD devices were probed already? */
 141                         goto error_mem;
 142                 }
 143
 144                 memset((void *)map_banks[idx], 0, sizeof(struct map_info));
 145                 map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
 146
 147                 if (!map_banks[idx]->name) {
 148                         ret = -ENOMEM;
 149                         /* FIXME: What if some MTD devices were probed already? */
 150                         goto error_mem;
 151                 }
 152                 sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);
 153
 154                 map_banks[idx]->size = flash_size;
 155                 map_banks[idx]->bankwidth = 4;
 156
 157                 simple_map_init(map_banks[idx]);
 158
 159                 map_banks[idx]->virt = start_scan_addr;
 160                 map_banks[idx]->phys = flash_addr;
 161                 /* FIXME: This looks utterly bogus, but I'm trying to
 162                    preserve the behaviour of the original (shown here)...
 163
 164                 map_banks[idx]->map_priv_1 =
 165                 start_scan_addr + ((idx > 0) ?
 166                 (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
 167                 */
 168
 169                 if (idx && mtd_banks[idx-1]) {
 170                         map_banks[idx]->virt += mtd_banks[idx-1]->size;
 171                         map_banks[idx]->phys += mtd_banks[idx-1]->size;
 172                 }
 173
 174                 //start to probe flash chips
 175                 mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
 176
 177                 if (mtd_banks[idx]) {
 178                         mtd_banks[idx]->owner = THIS_MODULE;
 179                         mtd_size += mtd_banks[idx]->size;
 180                         num_banks++;
 181
 182                         printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks,
 183                         mtd_banks[idx]->name, mtd_banks[idx]->size);
 184                 }
 185         }
 186
 187         /* no supported flash chips found */
 188         if (!num_banks) {
 189                 printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
 190                 ret = -ENXIO;
 191                 goto error_mem;
 192         }
 193
 194 #ifdef CONFIG_MTD_PARTITIONS
 195         /*
 196          * Select Static partition definitions
 197          */
 198         part_banks[0].mtd_part = tqm8xxl_partitions;
 199         part_banks[0].type = "Static image";
 200         part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
 201
 202         part_banks[1].mtd_part = tqm8xxl_fs_partitions;
 203         part_banks[1].type = "Static file system";
 204         part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);
 205
 206         for(idx = 0; idx < num_banks ; idx++) {
 207                 if (part_banks[idx].nums == 0) {
 208                         printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
 209                         add_mtd_device(mtd_banks[idx]);
 210                 } else {
 211                         printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
 212                                         idx, part_banks[idx].type);
 213                         add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part,
 214                                                                 part_banks[idx].nums);
 215                 }
 216         }
 217 #else
 218         printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
 219         for(idx = 0 ; idx < num_banks ; idx++)
 220                 add_mtd_device(mtd_banks[idx]);
 221 #endif
 222         return 0;
 223 error_mem:
 224         for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 225                 if(map_banks[idx] != NULL) {
 226                         kfree(map_banks[idx]->name);
 227                         map_banks[idx]->name = NULL;
 228                         kfree(map_banks[idx]);
 229                         map_banks[idx] = NULL;
 230                 }
 231         }
 232 error:
 233         iounmap(start_scan_addr);
 234         return ret;
 235 }
 236
 237 static void __exit cleanup_tqm_mtd(void)
 238 {
 239         unsigned int idx = 0;
 240         for(idx = 0 ; idx < num_banks ; idx++) {
 241                 /* destroy mtd_info previously allocated */
 242                 if (mtd_banks[idx]) {
 243                         del_mtd_partitions(mtd_banks[idx]);
 244                         map_destroy(mtd_banks[idx]);
 245                 }
 246                 /* release map_info not used anymore */
 247                 kfree(map_banks[idx]->name);
 248                 kfree(map_banks[idx]);
 249         }
 250
 251         if (start_scan_addr) {
 252                 iounmap(start_scan_addr);
 253                 start_scan_addr = 0;
 254         }
 255 }
 256
 257 module_init(init_tqm_mtd);
 258 module_exit(cleanup_tqm_mtd);
 259
 260 MODULE_LICENSE("GPL");
 261 MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
 262 MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");