release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/mtd/maps/bcm947xx-flash.c

   1 /*
   2  * Flash mapping for BCM947XX boards
   3  *
   4  * Copyright (C) 2012, Broadcom Corporation. All Rights Reserved.
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  13  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  15  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  16  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  *
  18  * $Id: bcm947xx-flash.c,v 1.6 2009-07-27 07:34:33 $
  19  */
  20
  21 #include <linux/version.h>
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24 #include <linux/kernel.h>
  25 #include <linux/init.h>
  26 #include <asm/io.h>
  27 #include <linux/mtd/mtd.h>
  28 #include <linux/mtd/map.h>
  29 #include <linux/mtd/partitions.h>
  30
  31 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
  32 #include <linux/config.h>
  33 #endif
  34
  35 #include <typedefs.h>
  36 #include <bcmnvram.h>
  37 #include <bcmutils.h>
  38 #include <hndsoc.h>
  39 #include <sbchipc.h>
  40 #include <siutils.h>
  41 #include <trxhdr.h>
  42
  43 /* Global SB handle */
  44 extern void *bcm947xx_sih;
  45 extern spinlock_t bcm947xx_sih_lock;
  46
  47 /* Convenience */
  48 #define sih bcm947xx_sih
  49 #define sih_lock bcm947xx_sih_lock
  50
  51 #ifdef CONFIG_MTD_PARTITIONS
  52 extern struct mtd_partition * init_mtd_partitions(struct mtd_info *mtd, size_t size);
  53 #endif
  54
  55 #define WINDOW_ADDR 0x1fc00000
  56 #define WINDOW_SIZE 0x400000
  57 #define BUSWIDTH 2
  58
  59 /* e.g., flash=2M or flash=4M */
  60 static int flash = 0;
  61 module_param(flash, int, 0);
  62 static int __init
  63 bcm947xx_setup(char *str)
  64 {
  65         flash = memparse(str, &str);
  66         return 1;
  67 }
  68 __setup("flash=", bcm947xx_setup);
  69
  70 static struct mtd_info *bcm947xx_mtd;
  71
  72
  73 #if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
  74 #define init_bcm947xx_map init_module
  75 #define cleanup_bcm947xx_map cleanup_module
  76 #endif
  77
  78 struct map_info bcm947xx_map = {
  79         .name = "Physically mapped flash",
  80         .size = WINDOW_SIZE,
  81         .bankwidth = BUSWIDTH
  82 };
  83
  84 static int __init
  85 init_bcm947xx_map(void)
  86 {
  87         ulong flags;
  88         uint coreidx;
  89         chipcregs_t *cc;
  90         uint32 fltype;
  91         uint window_addr = 0, window_size = 0;
  92         size_t size;
  93         int ret = 0;
  94 #ifdef CONFIG_MTD_PARTITIONS
  95         struct mtd_partition *parts;
  96         int i;
  97 #endif
  98
  99         spin_lock_irqsave(&sih_lock, flags);
 100         coreidx = si_coreidx(sih);
 101
 102         /* Check strapping option if chipcommon exists */
 103         if ((cc = si_setcore(sih, CC_CORE_ID, 0))) {
 104                 fltype = readl(&cc->capabilities) & CC_CAP_FLASH_MASK;
 105                 if (fltype == PFLASH) {
 106                         bcm947xx_map.map_priv_2 = 1;
 107                         window_addr = 0x1c000000;
 108                         bcm947xx_map.size = window_size = 32 * 1024 * 1024;
 109                         if ((readl(&cc->flash_config) & CC_CFG_DS) == 0)
 110                                 bcm947xx_map.bankwidth = 1;
 111                 }
 112         } else {
 113                 fltype = PFLASH;
 114                 bcm947xx_map.map_priv_2 = 0;
 115                 window_addr = WINDOW_ADDR;
 116                 bcm947xx_map.size = window_size = WINDOW_SIZE;
 117         }
 118
 119         si_setcoreidx(sih, coreidx);
 120         spin_unlock_irqrestore(&sih_lock, flags);
 121
 122         if (fltype != PFLASH) {
 123                 printk(KERN_ERR "pflash: found no supported devices\n");
 124                 ret = -ENODEV;
 125                 goto fail;
 126         }
 127
 128         bcm947xx_map.virt = ioremap(window_addr, window_size);
 129         if (bcm947xx_map.virt == NULL) {
 130                 printk(KERN_ERR "pflash: ioremap failed\n");
 131                 ret = -EIO;
 132                 goto fail;
 133         }
 134
 135         if ((bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map)) == NULL) {
 136                 printk(KERN_ERR "pflash: cfi_probe failed\n");
 137                 ret = -ENXIO;
 138                 goto fail;
 139         }
 140
 141         bcm947xx_mtd->owner = THIS_MODULE;
 142
 143 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
 144         bcm947xx_mtd->mutex = partitions_mutex_init();
 145 #else
 146         /* The mutex does not seem to be needed anymore */
 147 #endif
 148
 149         /* Allow size override for testing */
 150         size = flash ? : bcm947xx_mtd->size;
 151
 152         printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, window_addr);
 153
 154 #ifdef CONFIG_MTD_PARTITIONS
 155         parts = init_mtd_partitions(bcm947xx_mtd, size);
 156         for (i = 0; parts[i].name; i++);
 157         ret = add_mtd_partitions(bcm947xx_mtd, parts, i);
 158         if (ret) {
 159                 printk(KERN_ERR "pflash: add_mtd_partitions failed\n");
 160                 goto fail;
 161         }
 162 #endif
 163
 164         return 0;
 165
 166  fail:
 167         if (bcm947xx_mtd)
 168                 map_destroy(bcm947xx_mtd);
 169         if (bcm947xx_map.map_priv_1)
 170                 iounmap((void *) bcm947xx_map.map_priv_1);
 171         bcm947xx_map.map_priv_1 = 0;
 172         return ret;
 173 }
 174
 175 static void __exit
 176 cleanup_bcm947xx_map(void)
 177 {
 178 #ifdef CONFIG_MTD_PARTITIONS
 179         del_mtd_partitions(bcm947xx_mtd);
 180 #endif
 181         map_destroy(bcm947xx_mtd);
 182         iounmap((void *) bcm947xx_map.map_priv_1);
 183         bcm947xx_map.map_priv_1 = 0;
 184 }
 185
 186 module_init(init_bcm947xx_map);
 187 module_exit(cleanup_bcm947xx_map);