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 ath79_spi_controller_data ath79_spi0_cdata =
  20 {
  21         .cs_type = ATH79_SPI_CS_TYPE_INTERNAL,
  22         .cs_line = 0,
  23 };
  24
  25 static struct ath79_spi_controller_data ath79_spi1_cdata =
  26 {
  27         .cs_type = ATH79_SPI_CS_TYPE_INTERNAL,
  28         .cs_line = 1,
  29 };
  30
  31 static struct spi_board_info ath79_spi_info[] = {
  32         {
  33                 .bus_num        = 0,
  34                 .chip_select    = 0,
  35                 .max_speed_hz   = 25000000,
  36                 .modalias       = "m25p80",
  37                 .controller_data = &ath79_spi0_cdata,
  38         },
  39         {
  40                 .bus_num        = 0,
  41                 .chip_select    = 1,
  42                 .max_speed_hz   = 25000000,
  43                 .modalias       = "m25p80",
  44                 .controller_data = &ath79_spi1_cdata,
  45         }
  46 };
  47
  48 static struct ath79_spi_platform_data ath79_spi_data;
  49
  50 void __init ath79_register_m25p80(struct flash_platform_data *pdata)
  51 {
  52         ath79_spi_data.bus_num = 0;
  53         ath79_spi_data.num_chipselect = 1;
  54         ath79_spi_info[0].platform_data = pdata;
  55         ath79_register_spi(&ath79_spi_data, ath79_spi_info, 1);
  56 }
  57
  58 static struct flash_platform_data *multi_pdata;
  59
  60 static struct mtd_info *concat_devs[2] = { NULL, NULL };
  61 static struct work_struct mtd_concat_work;
  62
  63 static void mtd_concat_add_work(struct work_struct *work)
  64 {
  65         struct mtd_info *mtd;
  66
  67         mtd = mtd_concat_create(concat_devs, ARRAY_SIZE(concat_devs), "flash");
  68
  69         mtd_device_register(mtd, multi_pdata->parts, multi_pdata->nr_parts);
  70 }
  71
  72 static void mtd_concat_add(struct mtd_info *mtd)
  73 {
  74         static bool registered = false;
  75
  76         if (registered)
  77                 return;
  78
  79         if (!strcmp(mtd->name, "spi0.0"))
  80                 concat_devs[0] = mtd;
  81         else if (!strcmp(mtd->name, "spi0.1"))
  82                 concat_devs[1] = mtd;
  83         else
  84                 return;
  85
  86         if (!concat_devs[0] || !concat_devs[1])
  87                 return;
  88
  89         registered = true;
  90         INIT_WORK(&mtd_concat_work, mtd_concat_add_work);
  91         schedule_work(&mtd_concat_work);
  92 }
  93
  94 static void mtd_concat_remove(struct mtd_info *mtd)
  95 {
  96 }
  97
  98 static void add_mtd_concat_notifier(void)
  99 {
 100         static struct mtd_notifier not = {
 101                 .add = mtd_concat_add,
 102                 .remove = mtd_concat_remove,
 103         };
 104
 105         register_mtd_user(&not);
 106 }
 107
 108
 109 void __init ath79_register_m25p80_multi(struct flash_platform_data *pdata)
 110 {
 111         multi_pdata = pdata;
 112         add_mtd_concat_notifier();
 113         ath79_spi_data.bus_num = 0;
 114         ath79_spi_data.num_chipselect = 2;
 115         ath79_register_spi(&ath79_spi_data, ath79_spi_info, 2);
 116 }