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 #define WINDOW_ADDR 0x1fc00000
  46 #define WINDOW_SIZE 0x400000
  47 #define BUSWIDTH 2
  48
  49 /* e.g., flash=2M or flash=4M */
  50 static int flash = 0;
  51 module_param(flash, int, 0);
  52 static int __init
  53 bcm947xx_setup(char *str)
  54 {
  55         flash = memparse(str, &str);
  56         return 1;
  57 }
  58 __setup("flash=", bcm947xx_setup);
  59
  60 static struct mtd_info *bcm947xx_mtd;
  61
  62
  63 #if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
  64 #define init_bcm947xx_map init_module
  65 #define cleanup_bcm947xx_map cleanup_module
  66 #endif
  67
  68 struct map_info bcm947xx_map = {
  69         .name = "Physically mapped flash",
  70         .size = WINDOW_SIZE,
  71         .bankwidth = BUSWIDTH
  72 };
  73
  74 static int __init
  75 init_bcm947xx_map(void)
  76 {
  77         ulong flags;
  78         uint coreidx;
  79         chipcregs_t *cc;
  80         uint32 fltype;
  81         uint window_addr = 0, window_size = 0;
  82         size_t size;
  83         int ret = 0;
  84 #ifdef CONFIG_MTD_PARTITIONS
  85         struct mtd_partition *parts;
  86         int i;
  87 #endif
  88
  89         spin_lock_irqsave(&sih_lock, flags);
  90         coreidx = si_coreidx(sih);
  91
  92         /* Check strapping option if chipcommon exists */
  93         if ((cc = si_setcore(sih, CC_CORE_ID, 0))) {
  94                 fltype = readl(&cc->capabilities) & CC_CAP_FLASH_MASK;
  95                 if (fltype == PFLASH) {
  96                         bcm947xx_map.map_priv_2 = 1;
  97                         window_addr = 0x1c000000;
  98                         bcm947xx_map.size = window_size = 32 * 1024 * 1024;
  99                         if ((readl(&cc->flash_config) & CC_CFG_DS) == 0)
 100                                 bcm947xx_map.bankwidth = 1;
 101                 }
 102         } else {
 103                 fltype = PFLASH;
 104                 bcm947xx_map.map_priv_2 = 0;
 105                 window_addr = WINDOW_ADDR;
 106                 bcm947xx_map.size = window_size = WINDOW_SIZE;
 107         }
 108
 109         si_setcoreidx(sih, coreidx);
 110         spin_unlock_irqrestore(&sih_lock, flags);
 111
 112         if (fltype != PFLASH) {
 113                 printk(KERN_ERR "pflash: found no supported devices\n");
 114                 ret = -ENODEV;
 115                 goto fail;
 116         }
 117
 118         bcm947xx_map.virt = ioremap(window_addr, window_size);
 119         if (bcm947xx_map.virt == NULL) {
 120                 printk(KERN_ERR "pflash: ioremap failed\n");
 121                 ret = -EIO;
 122                 goto fail;
 123         }
 124
 125         if ((bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map)) == NULL) {
 126                 printk(KERN_ERR "pflash: cfi_probe failed\n");
 127                 ret = -ENXIO;
 128                 goto fail;
 129         }
 130
 131         bcm947xx_mtd->owner = THIS_MODULE;
 132
 133         /* Allow size override for testing */
 134         size = flash ? : bcm947xx_mtd->size;
 135
 136         printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, window_addr);
 137
 138 #ifdef CONFIG_MTD_PARTITIONS
 139         parts = init_mtd_partitions(bcm947xx_mtd, size);
 140         for (i = 0; parts[i].name; i++);
 141         ret = add_mtd_partitions(bcm947xx_mtd, parts, i);
 142         if (ret) {
 143                 printk(KERN_ERR "pflash: add_mtd_partitions failed\n");
 144                 goto fail;
 145         }
 146 #endif
 147
 148         return 0;
 149
 150  fail:
 151         if (bcm947xx_mtd)
 152                 map_destroy(bcm947xx_mtd);
 153         if (bcm947xx_map.map_priv_1)
 154                 iounmap((void *) bcm947xx_map.map_priv_1);
 155         bcm947xx_map.map_priv_1 = 0;
 156         return ret;
 157 }
 158
 159 static void __exit
 160 cleanup_bcm947xx_map(void)
 161 {
 162 #ifdef CONFIG_MTD_PARTITIONS
 163         del_mtd_partitions(bcm947xx_mtd);
 164 #endif
 165         map_destroy(bcm947xx_mtd);
 166         iounmap((void *) bcm947xx_map.map_priv_1);
 167         bcm947xx_map.map_priv_1 = 0;
 168 }
 169
 170 module_init(init_bcm947xx_map);
 171 module_exit(cleanup_bcm947xx_map);