git.openwrt.org Git - openwrt/staging/blogic.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 @@ -219,6 +219,7 @@ 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 +26,72 @@
  26
  27  #include <linux/kernel.h>
  28  #include <linux/module.h>
  29 +#include <linux/mtd/mtd.h>
  30 +#include <linux/mtd/partitions.h>
  31  #include <linux/of.h>
  32
  33  #include "rt2x00.h"
  34  #include "rt2x00lib.h"
  35
  36 +static int rt2800lib_read_eeprom_mtd(struct rt2x00_dev *rt2x00dev)
  37 +{
  38 +       int ret = -EINVAL;
  39 +#ifdef CONFIG_OF
  40 +       static struct firmware mtd_fw;
  41 +       struct device_node *np = rt2x00dev->dev->of_node, *mtd_np = NULL;
  42 +       size_t retlen, len = rt2x00dev->ops->eeprom_size;
  43 +       int i, size, offset = 0;
  44 +       struct mtd_info *mtd;
  45 +       const char *part;
  46 +       const __be32 *list;
  47 +       phandle phandle;
  48 +
  49 +       list = of_get_property(np, "ralink,mtd-eeprom", &size);
  50 +       if (!list)
  51 +               return -ENOENT;
  52 +
  53 +       phandle = be32_to_cpup(list++);
  54 +       if (phandle)
  55 +               mtd_np = of_find_node_by_phandle(phandle);
  56 +       if (!mtd_np) {
  57 +               dev_err(rt2x00dev->dev, "failed to load mtd phandle\n");
  58 +               return -EINVAL;
  59 +       }
  60 +
  61 +       part = of_get_property(mtd_np, "label", NULL);
  62 +       if (!part)
  63 +               part = mtd_np->name;
  64 +
  65 +       mtd = get_mtd_device_nm(part);
  66 +       if (IS_ERR(mtd)) {
  67 +               dev_err(rt2x00dev->dev, "failed to get mtd device \"%s\"\n", part);
  68 +               return PTR_ERR(mtd);
  69 +       }
  70 +
  71 +       if (size > sizeof(*list))
  72 +               offset = be32_to_cpup(list);
  73 +
  74 +       ret = mtd_read(mtd, offset, len, &retlen, (u_char *) rt2x00dev->eeprom);
  75 +       put_mtd_device(mtd);
  76 +
  77 +       if ((retlen != rt2x00dev->ops->eeprom_size) || ret) {
  78 +               dev_err(rt2x00dev->dev, "failed to load eeprom from device \"%s\"\n", part);
  79 +               return ret;
  80 +       }
  81 +
  82 +       if (of_find_property(np, "ralink,mtd-eeprom-swap", NULL))
  83 +               for (i = 0; i < len/sizeof(u16); i++)
  84 +                       rt2x00dev->eeprom[i] = swab16(rt2x00dev->eeprom[i]);
  85 +
  86 +       rt2x00dev->eeprom_file = &mtd_fw;
  87 +       mtd_fw.data = (const u8 *) rt2x00dev->eeprom;
  88 +
  89 +       dev_info(rt2x00dev->dev, "loaded eeprom from mtd device \"%s\"\n", part);
  90 +#endif
  91 +
  92 +       return ret;
  93 +}
  94 +
  95  static const char *
  96  rt2x00lib_get_eeprom_file_name(struct rt2x00_dev *rt2x00dev)
  97  {
  98 @@ -58,6 +119,9 @@ static int rt2x00lib_request_eeprom_file
  99         const char *ee_name;
 100         int retval;
 101
 102 +       if (!rt2800lib_read_eeprom_mtd(rt2x00dev))
 103 +               return 0;
 104 +
 105         ee_name = rt2x00lib_get_eeprom_file_name(rt2x00dev);
 106         if (!ee_name && test_bit(REQUIRE_EEPROM_FILE, &rt2x00dev->cap_flags)) {
 107                 rt2x00_err(rt2x00dev, "Required EEPROM name is missing.");