Pandora Sourcecodes - openembedded.git/blob

   1 From f1ad90ae5fd07257ea42aa771e16a7798cd440bb Mon Sep 17 00:00:00 2001
   2 From: Steve Sakoman <steve@sakoman.com>
   3 Date: Fri, 12 Feb 2010 12:17:48 -0800
   4 Subject: [PATCH 07/50] OMAP3: detect expansion board type/version using eeprom contents
   5
   6 ---
   7  board/overo/overo.c |   92 +++++++++++++++++++++++++++++++++++++++++++++++++++
   8  1 files changed, 92 insertions(+), 0 deletions(-)
   9
  10 diff --git a/board/overo/overo.c b/board/overo/overo.c
  11 index 3df1a12..2838a1f 100644
  12 --- a/board/overo/overo.c
  13 +++ b/board/overo/overo.c
  14 @@ -39,6 +39,31 @@
  15  #include <asm/mach-types.h>
  16  #include "overo.h"
  17
  18 +static struct {
  19 +       unsigned int device_vendor;
  20 +       unsigned char revision;
  21 +       unsigned char content;
  22 +       unsigned char data[6];
  23 +} expansion_config;
  24 +
  25 +#define TWL4030_I2C_BUS                        0
  26 +
  27 +#define EXPANSION_EEPROM_I2C_BUS       2
  28 +#define EXPANSION_EEPROM_I2C_ADDRESS   0x50
  29 +
  30 +#define GUMSTIX_VENDORID               0x0200
  31 +
  32 +#define GUMSTIX_SUMMIT                 0x01000200
  33 +#define GUMSTIX_TOBI                   0x02000200
  34 +#define GUMSTIX_TOBI_DUO               0x03000200
  35 +#define GUMSTIX_PALO35                 0x04000200
  36 +#define GUMSTIX_PALO43                 0x05000200
  37 +#define GUMSTIX_CHESTNUT43             0x06000200
  38 +#define GUMSTIX_PINTO                  0x07000200
  39 +
  40 +#define GUMSTIX_NO_EEPROM              0xfffffffe
  41 +#define GUMSTIX_UNKNOWN                        0xffffffff
  42 +
  43  #if defined(CONFIG_CMD_NET)
  44  static void setup_net_chip(void);
  45  #endif
  46 @@ -130,6 +155,31 @@ int get_board_revision(void) {
  47  }
  48
  49  /*
  50 + * Routine: get_expansion_id
  51 + * Description: This function checks for expansion board by checking I2C
  52 + *             bus 2 for the availability of an AT24C01B serial EEPROM.
  53 + *             returns the device_vendor field from the EEPROM
  54 + */
  55 +unsigned int get_expansion_id(void)
  56 +{
  57 +       i2c_set_bus_num(EXPANSION_EEPROM_I2C_BUS);
  58 +
  59 +       /* return GUMSTIX_NO_EEPROM if eeprom doesn't respond */
  60 +       if (i2c_probe(EXPANSION_EEPROM_I2C_ADDRESS) == 1)
  61 +               return GUMSTIX_NO_EEPROM;
  62 +
  63 +       /* read configuration data */
  64 +       i2c_read(EXPANSION_EEPROM_I2C_ADDRESS, 0, 1, (u8 *)&expansion_config,
  65 +                sizeof(expansion_config));
  66 +
  67 +       if ( (expansion_config.device_vendor & 0xffff) != GUMSTIX_VENDORID )
  68 +               return GUMSTIX_UNKNOWN;
  69 +       else
  70 +               return expansion_config.device_vendor;
  71 +}
  72 +
  73 +
  74 +/*
  75   * Routine: misc_init_r
  76   * Description: Configure board specific parts
  77   */
  78 @@ -156,6 +206,48 @@ int misc_init_r(void)
  79                         printf(" unsupported\n");
  80         }
  81
  82 +       switch (get_expansion_id()) {
  83 +               case GUMSTIX_SUMMIT:
  84 +                       printf("Recognized Summit expansion board (rev %d %s)\n",
  85 +                               expansion_config.revision, expansion_config.data);
  86 +                       setenv("defaultdisplay", "dvi");
  87 +                       break;
  88 +               case GUMSTIX_TOBI:
  89 +                       printf("Recognized Tobi expansion board (rev %d %s)\n",
  90 +                               expansion_config.revision, expansion_config.data);
  91 +                       setenv("defaultdisplay", "dvi");
  92 +                       break;
  93 +               case GUMSTIX_TOBI_DUO:
  94 +                       printf("Recognized Tobi Duo expansion board (rev %d %s)\n",
  95 +                               expansion_config.revision, expansion_config.data);
  96 +                       break;
  97 +               case GUMSTIX_PALO35:
  98 +                       printf("Recognized Palo 35 expansion board (rev %d %s)\n",
  99 +                               expansion_config.revision, expansion_config.data);
 100 +                       setenv("defaultdisplay", "lcd35");
 101 +                       break;
 102 +               case GUMSTIX_PALO43:
 103 +                       printf("Recognized Palo 43 expansion board (rev %d %s)\n",
 104 +                               expansion_config.revision, expansion_config.data);
 105 +                       setenv("defaultdisplay", "lcd43");
 106 +                       break;
 107 +               case GUMSTIX_CHESTNUT43:
 108 +                       printf("Recognized Chestnut 43 expansion board (rev %d %s)\n",
 109 +                               expansion_config.revision, expansion_config.data);
 110 +                       setenv("defaultdisplay", "lcd43");
 111 +                       break;
 112 +               case GUMSTIX_PINTO:
 113 +                       printf("Recognized Pinto expansion board (rev %d %s)\n",
 114 +                               expansion_config.revision, expansion_config.data);
 115 +                       break;
 116 +               case GUMSTIX_NO_EEPROM:
 117 +                       printf("No EEPROM on expansion board\n");
 118 +                       break;
 119 +               case GUMSTIX_UNKNOWN:
 120 +                       printf("Unrecognized expansion board\n");
 121 +       }
 122 +
 123 +       i2c_set_bus_num(TWL4030_I2C_BUS);
 124         twl4030_power_init();
 125         twl4030_led_init(TWL4030_LED_LEDEN_LEDAON | TWL4030_LED_LEDEN_LEDBON);
 126
 127 --
 128 1.6.6.1
 129