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 <asm/arch/onenand.h>
  21 #include <asm/arch/board.h>
  22 #include <asm/arch/gpmc.h>
  23
  24 #define ONENAND_MAP 0x20000000
  25 #define GPMC_OFF_CONFIG1_0 0x60
  26
  27 static struct mtd_partition onenand_partitions[] = {
  28         {
  29                 .name           = "(OneNAND)X-Loader",
  30                 .offset         = 0,
  31                 .size           = 4*(64*2048),  /* 0-3 blks reserved.
  32                                                    Mandated by ROM code */
  33                 .mask_flags     = MTD_WRITEABLE /* force read-only */
  34         },
  35         {
  36                 .name           = "(OneNAND)U-Boot",
  37                 .offset         = MTDPART_OFS_APPEND,
  38                 .size           =  2*(64*2048),
  39                 .mask_flags     = MTD_WRITEABLE /* force read-only */
  40         },
  41         {
  42                 .name           = "(OneNAND)U-Boot Environment",
  43                 .offset         = MTDPART_OFS_APPEND,
  44                 .size           = 1*(64*2048),
  45         },
  46         {
  47                 .name           = "(OneNAND)Kernel",
  48                 .offset         = MTDPART_OFS_APPEND,
  49                 .size           = 4*(64*2048),
  50         },
  51         {
  52                 .name           = "(OneNAND)File System",
  53                 .offset         = MTDPART_OFS_APPEND,
  54                 .size           = MTDPART_SIZ_FULL,
  55         },
  56 };
  57
  58 static struct omap_onenand_platform_data sdp_onenand_data = {
  59         .parts          = onenand_partitions,
  60         .nr_parts       = ARRAY_SIZE(onenand_partitions),
  61         .dma_channel    = -1,   /* disable DMA in OMAP OneNAND driver */
  62 };
  63
  64 static struct platform_device sdp_onenand_device = {
  65         .name           = "omap2-onenand",
  66         .id             = -1,
  67         .dev = {
  68                 .platform_data = &sdp_onenand_data,
  69         },
  70 };
  71
  72 void __init sdp2430_flash_init(void)
  73 {
  74         unsigned long gpmc_base_add, gpmc_cs_base_add;
  75         unsigned char cs=0;
  76
  77         gpmc_base_add = OMAP243X_GPMC_VIRT;
  78         while (cs < GPMC_CS_NUM) {
  79                 int ret = 0;
  80
  81                 /* Each GPMC set for a single CS is at offset 0x30 */
  82                 gpmc_cs_base_add =
  83                         (gpmc_base_add + GPMC_OFF_CONFIG1_0 + (cs*0x30));
  84
  85                 /* xloader/Uboot would have programmed the oneNAND
  86                  * base address for us This is a ugly hack. The proper
  87                  * way of doing this is to pass the setup of u-boot up
  88                  * to kernel using kernel params - something on the
  89                  * lines of machineID. Check if oneNAND is
  90                  * configured */
  91                 ret = __raw_readl(gpmc_cs_base_add + GPMC_CS_CONFIG7);
  92                 if ((ret & 0x3F) == (ONENAND_MAP >> 24)) {
  93                         /* Found it!! */
  94                         break;
  95                 }
  96                 cs++;
  97         }
  98         if (cs >= GPMC_CS_NUM) {
  99                 printk("OneNAND: Unable to find oneNAND configuration in GPMC "
 100                        " - not registering.\n");
 101                 return;
 102         }
 103
 104         sdp_onenand_data.cs = cs;
 105
 106         if (platform_device_register(&sdp_onenand_device) < 0) {
 107                 printk(KERN_ERR "Unable to register OneNAND device\n");
 108                 return;
 109         }
 110 }