release/src-rt/linux/linux-2.6/drivers/mtd/maps/bcm947xx-flash.c

   1 /*
   2  * Flash mapping for BCM947XX boards
   3  *
   4  * Copyright (C) 2009, Broadcom Corporation
   5  * All Rights Reserved.
   6  *
   7  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
   8  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
   9  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  10  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  11  *
  12  * $Id: bcm947xx-flash.c,v 1.6 2009/07/27 07:34:33 Exp $
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <asm/io.h>
  20 #include <linux/mtd/mtd.h>
  21 #include <linux/mtd/map.h>
  22 #include <linux/mtd/partitions.h>
  23 #include <linux/config.h>
  24
  25 #include <typedefs.h>
  26 #include <bcmnvram.h>
  27 #include <bcmutils.h>
  28 #include <hndsoc.h>
  29 #include <sbchipc.h>
  30 #include <siutils.h>
  31 #include <trxhdr.h>
  32
  33 /* Global SB handle */
  34 extern void *bcm947xx_sih;
  35 extern spinlock_t bcm947xx_sih_lock;
  36
  37 /* Convenience */
  38 #define sih bcm947xx_sih
  39 #define sih_lock bcm947xx_sih_lock
  40
  41 #ifdef CONFIG_MTD_PARTITIONS
  42 extern struct mtd_partition * init_mtd_partitions(struct mtd_info *mtd, size_t size);
  43 #endif
  44
  45 extern struct mutex *partitions_mutex_init(void);
  46
  47 #define WINDOW_ADDR 0x1fc00000
  48 #define WINDOW_SIZE 0x400000
  49 #define BUSWIDTH 2
  50
  51 /* e.g., flash=2M or flash=4M */
  52 static int flash = 0;
  53 module_param(flash, int, 0);
  54 static int __init
  55 bcm947xx_setup(char *str)
  56 {
  57         flash = memparse(str, &str);
  58         return 1;
  59 }
  60 __setup("flash=", bcm947xx_setup);
  61
  62 static struct mtd_info *bcm947xx_mtd;
  63
  64
  65 #if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
  66 #define init_bcm947xx_map init_module
  67 #define cleanup_bcm947xx_map cleanup_module
  68 #endif
  69
  70 struct map_info bcm947xx_map = {
  71         .name = "Physically mapped flash",
  72         .size = WINDOW_SIZE,
  73         .bankwidth = BUSWIDTH
  74 };
  75
  76 static int __init
  77 init_bcm947xx_map(void)
  78 {
  79         ulong flags;
  80         uint coreidx;
  81         chipcregs_t *cc;
  82         uint32 fltype;
  83         uint window_addr = 0, window_size = 0;
  84         size_t size;
  85         int ret = 0;
  86 #ifdef CONFIG_MTD_PARTITIONS
  87         struct mtd_partition *parts;
  88         int i;
  89 #endif
  90
  91         spin_lock_irqsave(&sih_lock, flags);
  92         coreidx = si_coreidx(sih);
  93
  94         /* Check strapping option if chipcommon exists */
  95         if ((cc = si_setcore(sih, CC_CORE_ID, 0))) {
  96                 fltype = readl(&cc->capabilities) & CC_CAP_FLASH_MASK;
  97                 if (fltype == PFLASH) {
  98                         bcm947xx_map.map_priv_2 = 1;
  99                         window_addr = 0x1c000000;
 100                         bcm947xx_map.size = window_size = 32 * 1024 * 1024;
 101                         if ((readl(&cc->flash_config) & CC_CFG_DS) == 0)
 102                                 bcm947xx_map.bankwidth = 1;
 103                 }
 104         } else {
 105                 fltype = PFLASH;
 106                 bcm947xx_map.map_priv_2 = 0;
 107                 window_addr = WINDOW_ADDR;
 108                 bcm947xx_map.size = window_size = WINDOW_SIZE;
 109         }
 110
 111         si_setcoreidx(sih, coreidx);
 112         spin_unlock_irqrestore(&sih_lock, flags);
 113
 114         if (fltype != PFLASH) {
 115                 printk(KERN_ERR "pflash: found no supported devices\n");
 116                 ret = -ENODEV;
 117                 goto fail;
 118         }
 119
 120         bcm947xx_map.virt = ioremap(window_addr, window_size);
 121         if (bcm947xx_map.virt == NULL) {
 122                 printk(KERN_ERR "pflash: ioremap failed\n");
 123                 ret = -EIO;
 124                 goto fail;
 125         }
 126
 127         if ((bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map)) == NULL) {
 128                 printk(KERN_ERR "pflash: cfi_probe failed\n");
 129                 ret = -ENXIO;
 130                 goto fail;
 131         }
 132
 133         bcm947xx_mtd->owner = THIS_MODULE;
 134         bcm947xx_mtd->mutex = partitions_mutex_init();
 135
 136         /* Allow size override for testing */
 137         size = flash ? : bcm947xx_mtd->size;
 138
 139         printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, window_addr);
 140
 141 #ifdef CONFIG_MTD_PARTITIONS
 142         parts = init_mtd_partitions(bcm947xx_mtd, size);
 143         for (i = 0; parts[i].name; i++);
 144         ret = add_mtd_partitions(bcm947xx_mtd, parts, i);
 145         if (ret) {
 146                 printk(KERN_ERR "pflash: add_mtd_partitions failed\n");
 147                 goto fail;
 148         }
 149 #endif
 150
 151         return 0;
 152
 153  fail:
 154         if (bcm947xx_mtd)
 155                 map_destroy(bcm947xx_mtd);
 156         if (bcm947xx_map.map_priv_1)
 157                 iounmap((void *) bcm947xx_map.map_priv_1);
 158         bcm947xx_map.map_priv_1 = 0;
 159         return ret;
 160 }
 161
 162 static void __exit
 163 cleanup_bcm947xx_map(void)
 164 {
 165 #ifdef CONFIG_MTD_PARTITIONS
 166         del_mtd_partitions(bcm947xx_mtd);
 167 #endif
 168         map_destroy(bcm947xx_mtd);
 169         iounmap((void *) bcm947xx_map.map_priv_1);
 170         bcm947xx_map.map_priv_1 = 0;
 171 }
 172
 173 module_init(init_bcm947xx_map);
 174 module_exit(cleanup_bcm947xx_map);