arch/arm/mach-omap2/board-omap3evm-flash.c

   1 /*
   2  * board-omap3evm-flash.c
   3  *
   4  * Copyright (c) 2008 Texas Instruments,
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/mtd/mtd.h>
  14 #include <linux/mtd/partitions.h>
  15 #include <linux/mtd/nand.h>
  16 #include <linux/mtd/onenand_regs.h>
  17 #include <linux/types.h>
  18 #include <linux/io.h>
  19
  20 #include <asm/mach/flash.h>
  21 #include <asm/arch/onenand.h>
  22 #include <asm/arch/board.h>
  23 #include <asm/arch/gpmc.h>
  24 #include <asm/arch/nand.h>
  25
  26 static int omap3evm_onenand_setup(void __iomem *);
  27
  28 static struct mtd_partition omap3evm_onenand_partitions[] = {
  29         {
  30                 .name           = "xloader",
  31                 .offset         = 0,
  32                 .size           = 4*(64*2048),
  33                 .mask_flags     = MTD_WRITEABLE
  34         },
  35         {
  36                 .name           = "uboot",
  37                 .offset         = MTDPART_OFS_APPEND,
  38                 .size           =  15*(64*2048),
  39                 .mask_flags     = MTD_WRITEABLE
  40         },
  41         {
  42                 .name           = "params",
  43                 .offset         = MTDPART_OFS_APPEND,
  44                 .size           = 1*(64*2048),
  45         },
  46         {
  47                 .name           = "linux",
  48                 .offset         = MTDPART_OFS_APPEND,
  49                 .size           = 40*(64*2048),
  50         },
  51         {
  52                 .name           = "jffs2",
  53                 .offset         = MTDPART_OFS_APPEND,
  54                 .size           = MTDPART_SIZ_FULL,
  55         },
  56 };
  57
  58 static struct omap_onenand_platform_data omap3evm_onenand_data = {
  59         .parts = omap3evm_onenand_partitions,
  60         .nr_parts = ARRAY_SIZE(omap3evm_onenand_partitions),
  61         .onenand_setup = omap3evm_onenand_setup,
  62         .dma_channel    = -1,   /* disable DMA in OMAP OneNAND driver */
  63 };
  64
  65 static struct platform_device omap3evm_onenand_device = {
  66         .name           = "omap2-onenand",
  67         .id             = -1,
  68         .dev = {
  69                 .platform_data = &omap3evm_onenand_data,
  70         },
  71 };
  72
  73 /*
  74  *      omap3evm_onenand_setup - Set the onenand sync mode
  75  *      @onenand_base:  The onenand base address in GPMC memory map
  76  *
  77  */
  78
  79 static int omap3evm_onenand_setup(void __iomem *onenand_base)
  80         {
  81         /* nothing is required to be setup for onenand as of now */
  82         return 0;
  83 }
  84
  85 void __init omap3evm_flash_init(void)
  86 {
  87         u8              cs = 0;
  88         u8              onenandcs = GPMC_CS_NUM + 1;
  89
  90         while (cs < GPMC_CS_NUM) {
  91                 u32 ret = 0;
  92                 ret = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
  93
  94                 /*
  95                 * xloader/Uboot would have programmed the oneNAND
  96                 * base address for us This is a ugly hack. The proper
  97                 * way of doing this is to pass the setup of u-boot up
  98                 * to kernel using kernel params - something on the
  99                 * lines of machineID. Check if oneNAND is configured
 100                 */
 101                 if ((ret & 0x3F) == (ONENAND_MAP >> 24))
 102                         onenandcs = cs;
 103                 cs++;
 104         }
 105         if (onenandcs > GPMC_CS_NUM) {
 106                 printk(KERN_INFO "OneNAND: Unable to find configuration "
 107                                 " in GPMC\n ");
 108                 return;
 109         }
 110
 111         if (onenandcs < GPMC_CS_NUM) {
 112                 omap3evm_onenand_data.cs = onenandcs;
 113                 if (platform_device_register(&omap3evm_onenand_device) < 0)
 114                         printk(KERN_ERR "Unable to register OneNAND device\n");
 115         }
 116 }
 117