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   1 /*
   2  * Handle mapping of the flash memory access routines
   3  * on TQM8xxL based devices.
   4  *
   5  * $Id: tqm8xxl.c,v 1.13 2004/10/20 22:21:53 dwmw2 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/config.h>
  26 #include <linux/module.h>
  27 #include <linux/types.h>
  28 #include <linux/kernel.h>
  29 #include <linux/init.h>
  30 #include <asm/io.h>
  31
  32 #include <linux/mtd/mtd.h>
  33 #include <linux/mtd/map.h>
  34 #include <linux/mtd/partitions.h>
  35
  36 #define FLASH_ADDR 0x40000000
  37 #define FLASH_SIZE 0x00800000
  38 #define FLASH_BANK_MAX 4
  39
  40 // trivial struct to describe partition information
  41 struct mtd_part_def
  42 {
  43         int nums;
  44         unsigned char *type;
  45         struct mtd_partition* mtd_part;
  46 };
  47
  48 //static struct mtd_info *mymtd;
  49 static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
  50 static struct map_info* map_banks[FLASH_BANK_MAX];
  51 static struct mtd_part_def part_banks[FLASH_BANK_MAX];
  52 static unsigned long num_banks;
  53 static void __iomem *start_scan_addr;
  54
  55 /*
  56  * Here are partition information for all known TQM8xxL series devices.
  57  * See include/linux/mtd/partitions.h for definition of the mtd_partition
  58  * structure.
  59  *
  60  * The *_max_flash_size is the maximum possible mapped flash size which
  61  * is not necessarily the actual flash size.  It must correspond to the
  62  * value specified in the mapping definition defined by the
  63  * "struct map_desc *_io_desc" for the corresponding machine.
  64  */
  65
  66 #ifdef CONFIG_MTD_PARTITIONS
  67 /* Currently, TQM8xxL has upto 8MiB flash */
  68 static unsigned long tqm8xxl_max_flash_size = 0x00800000;
  69
  70 /* partition definition for first flash bank
  71  * (cf. "drivers/char/flash_config.c")
  72  */
  73 static struct mtd_partition tqm8xxl_partitions[] = {
  74         {
  75           .name = "ppcboot",
  76           .offset = 0x00000000,
  77           .size = 0x00020000,           /* 128KB           */
  78           .mask_flags = MTD_WRITEABLE,  /* force read-only */
  79         },
  80         {
  81           .name = "kernel",             /* default kernel image */
  82           .offset = 0x00020000,
  83           .size = 0x000e0000,
  84           .mask_flags = MTD_WRITEABLE,  /* force read-only */
  85         },
  86         {
  87           .name = "user",
  88           .offset = 0x00100000,
  89           .size = 0x00100000,
  90         },
  91         {
  92           .name = "initrd",
  93           .offset = 0x00200000,
  94           .size = 0x00200000,
  95         }
  96 };
  97 /* partition definition for second flash bank */
  98 static struct mtd_partition tqm8xxl_fs_partitions[] = {
  99         {
 100           .name = "cramfs",
 101           .offset = 0x00000000,
 102           .size = 0x00200000,
 103         },
 104         {
 105           .name = "jffs",
 106           .offset = 0x00200000,
 107           .size = 0x00200000,
 108           //.size = MTDPART_SIZ_FULL,
 109         }
 110 };
 111 #endif
 112
 113 int __init init_tqm_mtd(void)
 114 {
 115         int idx = 0, ret = 0;
 116         unsigned long flash_addr, flash_size, mtd_size = 0;
 117         /* pointer to TQM8xxL board info data */
 118         bd_t *bd = (bd_t *)__res;
 119
 120         flash_addr = bd->bi_flashstart;
 121         flash_size = bd->bi_flashsize;
 122
 123         //request maximum flash size address space
 124         start_scan_addr = ioremap(flash_addr, flash_size);
 125         if (!start_scan_addr) {
 126                 printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __FUNCTION__, flash_addr);
 127                 return -EIO;
 128         }
 129
 130         for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 131                 if(mtd_size >= flash_size)
 132                         break;
 133
 134                 printk(KERN_INFO "%s: chip probing count %d\n", __FUNCTION__, idx);
 135
 136                 map_banks[idx] = (struct map_info *)kmalloc(sizeof(struct map_info), GFP_KERNEL);
 137                 if(map_banks[idx] == NULL) {
 138                         ret = -ENOMEM;
 139                         /* FIXME: What if some MTD devices were probed already? */
 140                         goto error_mem;
 141                 }
 142
 143                 memset((void *)map_banks[idx], 0, sizeof(struct map_info));
 144                 map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
 145
 146                 if (!map_banks[idx]->name) {
 147                         ret = -ENOMEM;
 148                         /* FIXME: What if some MTD devices were probed already? */
 149                         goto error_mem;
 150                 }
 151                 sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);
 152
 153                 map_banks[idx]->size = flash_size;
 154                 map_banks[idx]->bankwidth = 4;
 155
 156                 simple_map_init(map_banks[idx]);
 157
 158                 map_banks[idx]->virt = start_scan_addr;
 159                 map_banks[idx]->phys = flash_addr;
 160                 /* FIXME: This looks utterly bogus, but I'm trying to
 161                    preserve the behaviour of the original (shown here)...
 162
 163                 map_banks[idx]->map_priv_1 =
 164                 start_scan_addr + ((idx > 0) ?
 165                 (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
 166                 */
 167
 168                 if (idx && mtd_banks[idx-1]) {
 169                         map_banks[idx]->virt += mtd_banks[idx-1]->size;
 170                         map_banks[idx]->phys += mtd_banks[idx-1]->size;
 171                 }
 172
 173                 //start to probe flash chips
 174                 mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
 175
 176                 if (mtd_banks[idx]) {
 177                         mtd_banks[idx]->owner = THIS_MODULE;
 178                         mtd_size += mtd_banks[idx]->size;
 179                         num_banks++;
 180
 181                         printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks,
 182                         mtd_banks[idx]->name, mtd_banks[idx]->size);
 183                 }
 184         }
 185
 186         /* no supported flash chips found */
 187         if (!num_banks) {
 188                 printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
 189                 ret = -ENXIO;
 190                 goto error_mem;
 191         }
 192
 193 #ifdef CONFIG_MTD_PARTITIONS
 194         /*
 195          * Select Static partition definitions
 196          */
 197         part_banks[0].mtd_part = tqm8xxl_partitions;
 198         part_banks[0].type = "Static image";
 199         part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
 200
 201         part_banks[1].mtd_part = tqm8xxl_fs_partitions;
 202         part_banks[1].type = "Static file system";
 203         part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);
 204
 205         for(idx = 0; idx < num_banks ; idx++) {
 206                 if (part_banks[idx].nums == 0) {
 207                         printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
 208                         add_mtd_device(mtd_banks[idx]);
 209                 } else {
 210                         printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
 211                                         idx, part_banks[idx].type);
 212                         add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part,
 213                                                                 part_banks[idx].nums);
 214                 }
 215         }
 216 #else
 217         printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
 218         for(idx = 0 ; idx < num_banks ; idx++)
 219                 add_mtd_device(mtd_banks[idx]);
 220 #endif
 221         return 0;
 222 error_mem:
 223         for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 224                 if(map_banks[idx] != NULL) {
 225                         if(map_banks[idx]->name != NULL) {
 226                                 kfree(map_banks[idx]->name);
 227                                 map_banks[idx]->name = NULL;
 228                         }
 229                         kfree(map_banks[idx]);
 230                         map_banks[idx] = NULL;
 231                 }
 232         }
 233 error:
 234         iounmap(start_scan_addr);
 235         return ret;
 236 }
 237
 238 static void __exit cleanup_tqm_mtd(void)
 239 {
 240         unsigned int idx = 0;
 241         for(idx = 0 ; idx < num_banks ; idx++) {
 242                 /* destroy mtd_info previously allocated */
 243                 if (mtd_banks[idx]) {
 244                         del_mtd_partitions(mtd_banks[idx]);
 245                         map_destroy(mtd_banks[idx]);
 246                 }
 247                 /* release map_info not used anymore */
 248                 kfree(map_banks[idx]->name);
 249                 kfree(map_banks[idx]);
 250         }
 251
 252         if (start_scan_addr) {
 253                 iounmap(start_scan_addr);
 254                 start_scan_addr = 0;
 255         }
 256 }
 257
 258 module_init(init_tqm_mtd);
 259 module_exit(cleanup_tqm_mtd);
 260
 261 MODULE_LICENSE("GPL");
 262 MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
 263 MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");