target/linux/ar71xx/files/arch/mips/ath79/dev-m25p80.c

   1 /*
   2  *  Copyright (C) 2009-2012 Gabor Juhos <juhosg@openwrt.org>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify it
   5  *  under the terms of the GNU General Public License version 2 as published
   6  *  by the Free Software Foundation.
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/spi/spi.h>
  11 #include <linux/spi/flash.h>
  12 #include <linux/mtd/mtd.h>
  13 #include <linux/mtd/partitions.h>
  14 #include <linux/mtd/concat.h>
  15
  16 #include "dev-spi.h"
  17 #include "dev-m25p80.h"
  18
  19 static struct spi_board_info ath79_spi_info[] = {
  20         {
  21                 .bus_num        = 0,
  22                 .chip_select    = 0,
  23                 .max_speed_hz   = 25000000,
  24                 .modalias       = "m25p80",
  25         },
  26         {
  27                 .bus_num        = 0,
  28                 .chip_select    = 1,
  29                 .max_speed_hz   = 25000000,
  30                 .modalias       = "m25p80",
  31         }
  32 };
  33
  34 static struct ath79_spi_platform_data ath79_spi_data;
  35
  36 void __init ath79_register_m25p80(struct flash_platform_data *pdata)
  37 {
  38         ath79_spi_data.bus_num = 0;
  39         ath79_spi_data.num_chipselect = 1;
  40         ath79_spi_info[0].platform_data = pdata;
  41         ath79_register_spi(&ath79_spi_data, ath79_spi_info, 1);
  42 }
  43
  44 static struct flash_platform_data *multi_pdata;
  45
  46 static struct mtd_info *concat_devs[2] = { NULL, NULL };
  47 static struct work_struct mtd_concat_work;
  48
  49 static void mtd_concat_add_work(struct work_struct *work)
  50 {
  51         struct mtd_info *mtd;
  52
  53         mtd = mtd_concat_create(concat_devs, ARRAY_SIZE(concat_devs), "flash");
  54
  55         mtd_device_register(mtd, multi_pdata->parts, multi_pdata->nr_parts);
  56 }
  57
  58 static void mtd_concat_add(struct mtd_info *mtd)
  59 {
  60         static bool registered = false;
  61
  62         if (registered)
  63                 return;
  64
  65         if (!strcmp(mtd->name, "spi0.0"))
  66                 concat_devs[0] = mtd;
  67         else if (!strcmp(mtd->name, "spi0.1"))
  68                 concat_devs[1] = mtd;
  69         else
  70                 return;
  71
  72         if (!concat_devs[0] || !concat_devs[1])
  73                 return;
  74
  75         registered = true;
  76         INIT_WORK(&mtd_concat_work, mtd_concat_add_work);
  77         schedule_work(&mtd_concat_work);
  78 }
  79
  80 static void mtd_concat_remove(struct mtd_info *mtd)
  81 {
  82 }
  83
  84 static void add_mtd_concat_notifier(void)
  85 {
  86         static struct mtd_notifier not = {
  87                 .add = mtd_concat_add,
  88                 .remove = mtd_concat_remove,
  89         };
  90
  91         register_mtd_user(&not);
  92 }
  93
  94 void __init ath79_register_m25p80_multi(struct flash_platform_data *pdata)
  95 {
  96         multi_pdata = pdata;
  97         add_mtd_concat_notifier();
  98         ath79_spi_data.bus_num = 0;
  99         ath79_spi_data.num_chipselect = 2;
 100         ath79_register_spi(&ath79_spi_data, ath79_spi_info, 2);
 101 }