git.openwrt.org Git - openwrt/staging/zorun.git/blob

   1 From 339fe73f340161a624cc08e738d2244814852c3e Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Sun, 17 Mar 2013 00:55:04 +0100
   4 Subject: [PATCH] rt2x00: load eeprom on SoC from a mtd device defines inside
   5  OF
   6
   7 Signed-off-by: John Crispin <blogic@openwrt.org>
   8 ---
   9  drivers/net/wireless/ralink/rt2x00/Kconfig        |  1 +
  10  drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c | 65 +++++++++++++++++++++++
  11  2 files changed, 66 insertions(+)
  12
  13 --- a/drivers/net/wireless/ralink/rt2x00/Kconfig
  14 +++ b/drivers/net/wireless/ralink/rt2x00/Kconfig
  15 @@ -220,6 +220,7 @@ config RT2800SOC
  16         select RT2X00_LIB_EEPROM
  17         select RT2800_LIB
  18         select RT2800_LIB_MMIO
  19 +       select MTD if SOC_RT288X || SOC_RT305X
  20         ---help---
  21           This adds support for Ralink WiSoC devices.
  22           Supported chips: RT2880, RT3050, RT3052, RT3350, RT3352.
  23 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
  24 +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
  25 @@ -26,11 +26,76 @@
  26
  27  #include <linux/kernel.h>
  28  #include <linux/module.h>
  29 +#if IS_ENABLED(CONFIG_MTD)
  30 +#include <linux/mtd/mtd.h>
  31 +#include <linux/mtd/partitions.h>
  32 +#endif
  33  #include <linux/of.h>
  34
  35  #include "rt2x00.h"
  36  #include "rt2x00lib.h"
  37
  38 +#if IS_ENABLED(CONFIG_MTD)
  39 +static int rt2800lib_read_eeprom_mtd(struct rt2x00_dev *rt2x00dev)
  40 +{
  41 +       int ret = -EINVAL;
  42 +#ifdef CONFIG_OF
  43 +       static struct firmware mtd_fw;
  44 +       struct device_node *np = rt2x00dev->dev->of_node, *mtd_np = NULL;
  45 +       size_t retlen, len = rt2x00dev->ops->eeprom_size;
  46 +       int i, size, offset = 0;
  47 +       struct mtd_info *mtd;
  48 +       const char *part;
  49 +       const __be32 *list;
  50 +       phandle phandle;
  51 +
  52 +       list = of_get_property(np, "ralink,mtd-eeprom", &size);
  53 +       if (!list)
  54 +               return -ENOENT;
  55 +
  56 +       phandle = be32_to_cpup(list++);
  57 +       if (phandle)
  58 +               mtd_np = of_find_node_by_phandle(phandle);
  59 +       if (!mtd_np) {
  60 +               dev_err(rt2x00dev->dev, "failed to load mtd phandle\n");
  61 +               return -EINVAL;
  62 +       }
  63 +
  64 +       part = of_get_property(mtd_np, "label", NULL);
  65 +       if (!part)
  66 +               part = mtd_np->name;
  67 +
  68 +       mtd = get_mtd_device_nm(part);
  69 +       if (IS_ERR(mtd)) {
  70 +               dev_err(rt2x00dev->dev, "failed to get mtd device \"%s\"\n", part);
  71 +               return PTR_ERR(mtd);
  72 +       }
  73 +
  74 +       if (size > sizeof(*list))
  75 +               offset = be32_to_cpup(list);
  76 +
  77 +       ret = mtd_read(mtd, offset, len, &retlen, (u_char *) rt2x00dev->eeprom);
  78 +       put_mtd_device(mtd);
  79 +
  80 +       if ((retlen != rt2x00dev->ops->eeprom_size) || ret) {
  81 +               dev_err(rt2x00dev->dev, "failed to load eeprom from device \"%s\"\n", part);
  82 +               return ret;
  83 +       }
  84 +
  85 +       if (of_find_property(np, "ralink,mtd-eeprom-swap", NULL))
  86 +               for (i = 0; i < len/sizeof(u16); i++)
  87 +                       rt2x00dev->eeprom[i] = swab16(rt2x00dev->eeprom[i]);
  88 +
  89 +       rt2x00dev->eeprom_file = &mtd_fw;
  90 +       mtd_fw.data = (const u8 *) rt2x00dev->eeprom;
  91 +
  92 +       dev_info(rt2x00dev->dev, "loaded eeprom from mtd device \"%s\"\n", part);
  93 +#endif
  94 +
  95 +       return ret;
  96 +}
  97 +#endif
  98 +
  99  static const char *
 100  rt2x00lib_get_eeprom_file_name(struct rt2x00_dev *rt2x00dev)
 101  {
 102 @@ -58,6 +123,11 @@ static int rt2x00lib_request_eeprom_file
 103         const char *ee_name;
 104         int retval;
 105
 106 +#if IS_ENABLED(CONFIG_MTD)
 107 +       if (!rt2800lib_read_eeprom_mtd(rt2x00dev))
 108 +               return 0;
 109 +#endif
 110 +
 111         ee_name = rt2x00lib_get_eeprom_file_name(rt2x00dev);
 112         if (!ee_name && test_bit(REQUIRE_EEPROM_FILE, &rt2x00dev->cap_flags)) {
 113                 rt2x00_err(rt2x00dev, "Required EEPROM name is missing.");