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 accomodate 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/module.h>
  32 #include <linux/types.h>
  33 #include <linux/kernel.h>
  34 #include <linux/mtd/mtd.h>
  35 #include <linux/mtd/map.h>
  36 #include <linux/mtd/partitions.h>
  37
  38 #include <asm/io.h>
  39
  40 #include <msp_prom.h>
  41 #include <msp_regs.h>
  42
  43
  44 static struct mtd_info **msp_flash;
  45 static struct mtd_partition **msp_parts;
  46 static struct map_info *msp_maps;
  47 static int fcnt;
  48
  49 #define DEBUG_MARKER printk(KERN_NOTICE "%s[%d]\n",__FUNCTION__,__LINE__)
  50
  51 int __init init_msp_flash(void)
  52 {
  53         int i, j;
  54         int offset, coff;
  55         char *env;
  56         int pcnt;
  57         char flash_name[] = "flash0";
  58         char part_name[] = "flash0_0";
  59         unsigned addr, size;
  60
  61         /* If ELB is disabled by "ful-mux" mode, we can't get at flash */
  62         if ((*DEV_ID_REG & DEV_ID_SINGLE_PC) &&
  63             (*ELB_1PC_EN_REG & SINGLE_PCCARD)) {
  64                 printk(KERN_NOTICE "Single PC Card mode: no flash access\n");
  65                 return -ENXIO;
  66         }
  67
  68         /* examine the prom environment for flash devices */
  69         for (fcnt = 0; (env = prom_getenv(flash_name)); fcnt++)
  70                 flash_name[5] = '0' + fcnt + 1;
  71
  72         if (fcnt < 1)
  73                 return -ENXIO;
  74
  75         printk(KERN_NOTICE "Found %d PMC flash devices\n", fcnt);
  76
  77         msp_flash = kmalloc(fcnt * sizeof(struct map_info *), GFP_KERNEL);
  78         msp_parts = kmalloc(fcnt * sizeof(struct mtd_partition *), GFP_KERNEL);
  79         msp_maps = kcalloc(fcnt, sizeof(struct mtd_info), GFP_KERNEL);
  80         if (!msp_flash || !msp_parts || !msp_maps) {
  81                 kfree(msp_maps);
  82                 kfree(msp_parts);
  83                 kfree(msp_flash);
  84                 return -ENOMEM;
  85         }
  86
  87         /* loop over the flash devices, initializing each */
  88         for (i = 0; i < fcnt; i++) {
  89                 /* examine the prom environment for flash partititions */
  90                 part_name[5] = '0' + i;
  91                 part_name[7] = '0';
  92                 for (pcnt = 0; (env = prom_getenv(part_name)); pcnt++)
  93                         part_name[7] = '0' + pcnt + 1;
  94
  95                 if (pcnt == 0) {
  96                         printk(KERN_NOTICE "Skipping flash device %d "
  97                                 "(no partitions defined)\n", i);
  98                         continue;
  99                 }
 100
 101                 msp_parts[i] = kcalloc(pcnt, sizeof(struct mtd_partition),
 102                                        GFP_KERNEL);
 103
 104                 /* now initialize the devices proper */
 105                 flash_name[5] = '0' + i;
 106                 env = prom_getenv(flash_name);
 107
 108                 if (sscanf(env, "%x:%x", &addr, &size) < 2)
 109                         return -ENXIO;
 110                 addr = CPHYSADDR(addr);
 111
 112                 printk(KERN_NOTICE
 113                         "MSP flash device \"%s\": 0x%08x at 0x%08x\n",
 114                         flash_name, size, addr);
 115                 /* This must matchs the actual size of the flash chip */
 116                 msp_maps[i].size = size;
 117                 msp_maps[i].phys = addr;
 118
 119                 /*
 120                  * Platforms have a specific limit of the size of memory
 121                  * which may be mapped for flash:
 122                  */
 123                 if (size > CONFIG_MSP_FLASH_MAP_LIMIT)
 124                         size = CONFIG_MSP_FLASH_MAP_LIMIT;
 125                 msp_maps[i].virt = ioremap(addr, size);
 126                 msp_maps[i].bankwidth = 1;
 127                 msp_maps[i].name = strncpy(kmalloc(7, GFP_KERNEL),
 128                                         flash_name, 7);
 129
 130                 if (msp_maps[i].virt == NULL)
 131                         return -ENXIO;
 132
 133                 for (j = 0; j < pcnt; j++) {
 134                         part_name[5] = '0' + i;
 135                         part_name[7] = '0' + j;
 136
 137                         env = prom_getenv(part_name);
 138
 139                         if (sscanf(env, "%x:%x:%n", &offset, &size, &coff) < 2)
 140                                 return -ENXIO;
 141
 142                         msp_parts[i][j].size = size;
 143                         msp_parts[i][j].offset = offset;
 144                         msp_parts[i][j].name = env + coff;
 145                 }
 146
 147                 /* now probe and add the device */
 148                 simple_map_init(&msp_maps[i]);
 149                 msp_flash[i] = do_map_probe("cfi_probe", &msp_maps[i]);
 150                 if (msp_flash[i]) {
 151                         msp_flash[i]->owner = THIS_MODULE;
 152                         add_mtd_partitions(msp_flash[i], msp_parts[i], pcnt);
 153                 } else {
 154                         printk(KERN_ERR "map probe failed for flash\n");
 155                         return -ENXIO;
 156                 }
 157         }
 158
 159         return 0;
 160 }
 161
 162 static void __exit cleanup_msp_flash(void)
 163 {
 164         int i;
 165
 166         for (i = 0; i < sizeof(msp_flash) / sizeof(struct mtd_info **); i++) {
 167                 del_mtd_partitions(msp_flash[i]);
 168                 map_destroy(msp_flash[i]);
 169                 iounmap((void *)msp_maps[i].virt);
 170
 171                 /* free the memory */
 172                 kfree(msp_maps[i].name);
 173                 kfree(msp_parts[i]);
 174         }
 175
 176         kfree(msp_flash);
 177         kfree(msp_parts);
 178         kfree(msp_maps);
 179 }
 180
 181 MODULE_AUTHOR("PMC-Sierra, Inc");
 182 MODULE_DESCRIPTION("MTD map driver for PMC-Sierra MSP boards");
 183 MODULE_LICENSE("GPL");
 184
 185 module_init(init_msp_flash);
 186 module_exit(cleanup_msp_flash);