arch/arm/mach-omap2/board-2430sdp-flash.c

   1 /*
   2  * linux/arch/arm/mach-omap2/board-2430sdp-flash.c
   3  *
   4  * Copyright (C) 2007 MontaVista Software, Inc. <source@mvista.com>
   5  * Author: Kevin Hilman
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/platform_device.h>
  14 #include <asm/mach/flash.h>
  15 #include <linux/mtd/mtd.h>
  16 #include <linux/mtd/partitions.h>
  17 #include <linux/mtd/onenand_regs.h>
  18
  19 #include <asm/io.h>
  20 #include <mach/onenand.h>
  21 #include <mach/board.h>
  22 #include <mach/gpmc.h>
  23 #include <mach/nand.h>
  24
  25 #define ONENAND_MAP 0x20000000
  26 #define GPMC_OFF_CONFIG1_0 0x60
  27
  28 enum fstype {
  29         NAND = 0,
  30         NOR,
  31         ONENAND,
  32         UNKNOWN = -1
  33 };
  34
  35 static enum fstype flash_type = NAND;
  36
  37 static struct mtd_partition nand_partitions[] = {
  38         {
  39                 .name           = "X-Loader",
  40                 .offset         = 0,
  41                 .size           = 4*(64*2048),  /* 0-3 blks reserved.
  42                                                    Mandated by ROM code */
  43                 .mask_flags     = MTD_WRITEABLE /* force read-only */
  44         },
  45         {
  46                 .name           = "U-Boot",
  47                 .offset         = MTDPART_OFS_APPEND,
  48                 .size           =  4*(64*2048),
  49                 .mask_flags     = MTD_WRITEABLE /* force read-only */
  50         },
  51         {
  52                 .name           = "U-Boot Environment",
  53                 .offset         = MTDPART_OFS_APPEND,
  54                 .size           = 2*(64*2048),
  55         },
  56         {
  57                 .name           = "Kernel",
  58                 .offset         = MTDPART_OFS_APPEND,
  59                 .size           = 32*(64*2048),         /* 4*1M */
  60         },
  61         {
  62                 .name           = "File System",
  63                 .offset         = MTDPART_OFS_APPEND,
  64                 .size           = MTDPART_SIZ_FULL,
  65         },
  66 };
  67 static struct omap_nand_platform_data sdp_nand_data = {
  68         .parts          = nand_partitions,
  69         .nr_parts       = ARRAY_SIZE(nand_partitions),
  70         .dma_channel    = -1,   /* disable DMA in OMAP OneNAND driver */
  71 };
  72
  73 static struct platform_device sdp_nand_device = {
  74         .name           = "omap2-nand",
  75         .id             = -1,
  76         .dev = {
  77                 .platform_data = &sdp_nand_data,
  78         },
  79 };
  80
  81 static struct mtd_partition onenand_partitions[] = {
  82         {
  83                 .name           = "(OneNAND)X-Loader",
  84                 .offset         = 0,
  85                 .size           = 4*(64*2048),  /* 0-3 blks reserved.
  86                                                    Mandated by ROM code */
  87                 .mask_flags     = MTD_WRITEABLE /* force read-only */
  88         },
  89         {
  90                 .name           = "(OneNAND)U-Boot",
  91                 .offset         = MTDPART_OFS_APPEND,
  92                 .size           =  2*(64*2048),
  93                 .mask_flags     = MTD_WRITEABLE /* force read-only */
  94         },
  95         {
  96                 .name           = "(OneNAND)U-Boot Environment",
  97                 .offset         = MTDPART_OFS_APPEND,
  98                 .size           = 1*(64*2048),
  99         },
 100         {
 101                 .name           = "(OneNAND)Kernel",
 102                 .offset         = MTDPART_OFS_APPEND,
 103                 .size           = 4*(64*2048),
 104         },
 105         {
 106                 .name           = "(OneNAND)File System",
 107                 .offset         = MTDPART_OFS_APPEND,
 108                 .size           = MTDPART_SIZ_FULL,
 109         },
 110 };
 111
 112 static struct omap_onenand_platform_data sdp_onenand_data = {
 113         .parts          = onenand_partitions,
 114         .nr_parts       = ARRAY_SIZE(onenand_partitions),
 115         .dma_channel    = -1,   /* disable DMA in OMAP OneNAND driver */
 116 };
 117
 118 static struct platform_device sdp_onenand_device = {
 119         .name           = "omap2-onenand",
 120         .id             = -1,
 121         .dev = {
 122                 .platform_data = &sdp_onenand_data,
 123         },
 124 };
 125
 126 void __init sdp2430_flash_init(void)
 127 {
 128         void __iomem *gpmc_base_add, *gpmc_cs_base_add;
 129         unsigned char cs = 0;
 130
 131         gpmc_base_add = (__force void __iomem *)OMAP243X_GPMC_VIRT;
 132         while (cs < GPMC_CS_NUM) {
 133                 int ret = 0;
 134
 135                 /* Each GPMC set for a single CS is at offset 0x30 */
 136                 gpmc_cs_base_add = (gpmc_base_add + GPMC_OFF_CONFIG1_0 +
 137                                     (cs*0x30));
 138
 139                 /* xloader/Uboot would have programmed the NAND/oneNAND
 140                  * base address for us This is a ugly hack. The proper
 141                  * way of doing this is to pass the setup of u-boot up
 142                  * to kernel using kernel params - something on the
 143                  * lines of machineID. Check if Nand/oneNAND is
 144                  * configured */
 145                 ret = __raw_readl(gpmc_cs_base_add + GPMC_CS_CONFIG1);
 146                 if ((ret & 0xC00) == (0x800)) {
 147                         /* Found it!! */
 148                         printk(KERN_INFO "NAND: Found NAND on CS %d \n", cs);
 149                         flash_type = NAND;
 150                         break;
 151                 }
 152                 ret = __raw_readl(gpmc_cs_base_add + GPMC_CS_CONFIG7);
 153                 if ((ret & 0x3F) == (ONENAND_MAP >> 24)) {
 154                         /* Found it!! */
 155                         flash_type = ONENAND;
 156                         break;
 157                 }
 158                 cs++;
 159         }
 160         if (cs >= GPMC_CS_NUM) {
 161                 printk(KERN_INFO "MTD: Unable to find MTD configuration in "
 162                                  "GPMC   - not registering.\n");
 163                 return;
 164         }
 165
 166         if (flash_type == NAND) {
 167                 sdp_nand_data.cs               = cs;
 168                 sdp_nand_data.gpmc_cs_baseaddr = gpmc_cs_base_add;
 169                 sdp_nand_data.gpmc_baseaddr    = gpmc_base_add;
 170
 171                 if (platform_device_register(&sdp_nand_device) < 0) {
 172                         printk(KERN_ERR "Unable to register NAND device\n");
 173                         return;
 174                 }
 175         }
 176
 177         if (flash_type == ONENAND) {
 178                 sdp_onenand_data.cs = cs;
 179
 180                 if (platform_device_register(&sdp_onenand_device) < 0) {
 181                         printk(KERN_ERR "Unable to register OneNAND device\n");
 182                         return;
 183                 }
 184         }
 185 }