drivers/mtd/maps/pmcmsp-flash.c

   1 /*
   2  * Mapping of a custom board with both AMD CFI and JEDEC flash in partitions.
   3  * Config with both CFI and JEDEC device support.
   4  *
   5  * Basically physmap.c with the addition of partitions and
   6  * an array of mapping info to accommodate more than one flash type per board.
   7  *
   8  * Copyright 2005-2007 PMC-Sierra, Inc.
   9  *
  10  *  This program is free software; you can redistribute  it and/or modify it
  11  *  under  the terms of  the GNU General  Public License as published by the
  12  *  Free Software Foundation;  either version 2 of the  License, or (at your
  13  *  option) any later version.
  14  *
  15  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  16  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  17  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  18  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  19  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  21  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  22  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  23  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  *  You should have received a copy of the  GNU General Public License along
  27  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  28  *  675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30
  31 #include <linux/slab.h>
  32 #include <linux/module.h>
  33 #include <linux/types.h>
  34 #include <linux/kernel.h>
  35 #include <linux/mtd/mtd.h>
  36 #include <linux/mtd/map.h>
  37 #include <linux/mtd/partitions.h>
  38
  39 #include <asm/io.h>
  40
  41 #include <msp_prom.h>
  42 #include <msp_regs.h>
  43
  44
  45 static struct mtd_info **msp_flash;
  46 static struct mtd_partition **msp_parts;
  47 static struct map_info *msp_maps;
  48 static int fcnt;
  49
  50 #define DEBUG_MARKER printk(KERN_NOTICE "%s[%d]\n", __func__, __LINE__)
  51
  52 static int __init init_msp_flash(void)
  53 {
  54         int i, j, ret = -ENOMEM;
  55         int offset, coff;
  56         char *env;
  57         int pcnt;
  58         char flash_name[] = "flash0";
  59         char part_name[] = "flash0_0";
  60         unsigned addr, size;
  61
  62         /* If ELB is disabled by "ful-mux" mode, we can't get at flash */
  63         if ((*DEV_ID_REG & DEV_ID_SINGLE_PC) &&
  64             (*ELB_1PC_EN_REG & SINGLE_PCCARD)) {
  65                 printk(KERN_NOTICE "Single PC Card mode: no flash access\n");
  66                 return -ENXIO;
  67         }
  68
  69         /* examine the prom environment for flash devices */
  70         for (fcnt = 0; (env = prom_getenv(flash_name)); fcnt++)
  71                 flash_name[5] = '0' + fcnt + 1;
  72
  73         if (fcnt < 1)
  74                 return -ENXIO;
  75
  76         printk(KERN_NOTICE "Found %d PMC flash devices\n", fcnt);
  77
  78         msp_flash = kmalloc(fcnt * sizeof(struct map_info *), GFP_KERNEL);
  79         if (!msp_flash)
  80                 return -ENOMEM;
  81
  82         msp_parts = kmalloc(fcnt * sizeof(struct mtd_partition *), GFP_KERNEL);
  83         if (!msp_parts)
  84                 goto free_msp_flash;
  85
  86         msp_maps = kcalloc(fcnt, sizeof(struct mtd_info), GFP_KERNEL);
  87         if (!msp_maps)
  88                 goto free_msp_parts;
  89
  90         /* loop over the flash devices, initializing each */
  91         for (i = 0; i < fcnt; i++) {
  92                 /* examine the prom environment for flash partititions */
  93                 part_name[5] = '0' + i;
  94                 part_name[7] = '0';
  95                 for (pcnt = 0; (env = prom_getenv(part_name)); pcnt++)
  96                         part_name[7] = '0' + pcnt + 1;
  97
  98                 if (pcnt == 0) {
  99                         printk(KERN_NOTICE "Skipping flash device %d "
 100                                 "(no partitions defined)\n", i);
 101                         continue;
 102                 }
 103
 104                 msp_parts[i] = kcalloc(pcnt, sizeof(struct mtd_partition),
 105                                        GFP_KERNEL);
 106                 if (!msp_parts[i])
 107                         goto cleanup_loop;
 108
 109                 /* now initialize the devices proper */
 110                 flash_name[5] = '0' + i;
 111                 env = prom_getenv(flash_name);
 112
 113                 if (sscanf(env, "%x:%x", &addr, &size) < 2) {
 114                         ret = -ENXIO;
 115                         kfree(msp_parts[i]);
 116                         goto cleanup_loop;
 117                 }
 118                 addr = CPHYSADDR(addr);
 119
 120                 printk(KERN_NOTICE
 121                         "MSP flash device \"%s\": 0x%08x at 0x%08x\n",
 122                         flash_name, size, addr);
 123                 /* This must matchs the actual size of the flash chip */
 124                 msp_maps[i].size = size;
 125                 msp_maps[i].phys = addr;
 126
 127                 /*
 128                  * Platforms have a specific limit of the size of memory
 129                  * which may be mapped for flash:
 130                  */
 131                 if (size > CONFIG_MSP_FLASH_MAP_LIMIT)
 132                         size = CONFIG_MSP_FLASH_MAP_LIMIT;
 133
 134                 msp_maps[i].virt = ioremap(addr, size);
 135                 if (msp_maps[i].virt == NULL) {
 136                         ret = -ENXIO;
 137                         kfree(msp_parts[i]);
 138                         goto cleanup_loop;
 139                 }
 140
 141                 msp_maps[i].bankwidth = 1;
 142                 msp_maps[i].name = kmalloc(7, GFP_KERNEL);
 143                 if (!msp_maps[i].name) {
 144                         iounmap(msp_maps[i].virt);
 145                         kfree(msp_parts[i]);
 146                         goto cleanup_loop;
 147                 }
 148
 149                 msp_maps[i].name = strncpy(msp_maps[i].name, flash_name, 7);
 150
 151                 for (j = 0; j < pcnt; j++) {
 152                         part_name[5] = '0' + i;
 153                         part_name[7] = '0' + j;
 154
 155                         env = prom_getenv(part_name);
 156
 157                         if (sscanf(env, "%x:%x:%n", &offset, &size,
 158                                                 &coff) < 2) {
 159                                 ret = -ENXIO;
 160                                 kfree(msp_maps[i].name);
 161                                 iounmap(msp_maps[i].virt);
 162                                 kfree(msp_parts[i]);
 163                                 goto cleanup_loop;
 164                         }
 165
 166                         msp_parts[i][j].size = size;
 167                         msp_parts[i][j].offset = offset;
 168                         msp_parts[i][j].name = env + coff;
 169                 }
 170
 171                 /* now probe and add the device */
 172                 simple_map_init(&msp_maps[i]);
 173                 msp_flash[i] = do_map_probe("cfi_probe", &msp_maps[i]);
 174                 if (msp_flash[i]) {
 175                         msp_flash[i]->owner = THIS_MODULE;
 176                         mtd_device_register(msp_flash[i], msp_parts[i], pcnt);
 177                 } else {
 178                         printk(KERN_ERR "map probe failed for flash\n");
 179                         ret = -ENXIO;
 180                         kfree(msp_maps[i].name);
 181                         iounmap(msp_maps[i].virt);
 182                         kfree(msp_parts[i]);
 183                         goto cleanup_loop;
 184                 }
 185         }
 186
 187         return 0;
 188
 189 cleanup_loop:
 190         while (i--) {
 191                 mtd_device_unregister(msp_flash[i]);
 192                 map_destroy(msp_flash[i]);
 193                 kfree(msp_maps[i].name);
 194                 iounmap(msp_maps[i].virt);
 195                 kfree(msp_parts[i]);
 196         }
 197         kfree(msp_maps);
 198 free_msp_parts:
 199         kfree(msp_parts);
 200 free_msp_flash:
 201         kfree(msp_flash);
 202         return ret;
 203 }
 204
 205 static void __exit cleanup_msp_flash(void)
 206 {
 207         int i;
 208
 209         for (i = 0; i < fcnt; i++) {
 210                 mtd_device_unregister(msp_flash[i]);
 211                 map_destroy(msp_flash[i]);
 212                 iounmap((void *)msp_maps[i].virt);
 213
 214                 /* free the memory */
 215                 kfree(msp_maps[i].name);
 216                 kfree(msp_parts[i]);
 217         }
 218
 219         kfree(msp_flash);
 220         kfree(msp_parts);
 221         kfree(msp_maps);
 222 }
 223
 224 MODULE_AUTHOR("PMC-Sierra, Inc");
 225 MODULE_DESCRIPTION("MTD map driver for PMC-Sierra MSP boards");
 226 MODULE_LICENSE("GPL");
 227
 228 module_init(init_msp_flash);
 229 module_exit(cleanup_msp_flash);