patches/0113-ENGR00123488-MX53-Board-Identification.patch

   1 From a0e1ec967f99d08ce0a48c45a509959453e5f3a7 Mon Sep 17 00:00:00 2001
   2 From: Jason Liu <r64343@freescale.com>
   3 Date: Fri, 14 May 2010 16:08:22 +0800
   4 Subject: [PATCH] ENGR00123488  MX53 Board Identification
   5
   6 The CPU_ID0 analog voltage level is obtained by reading ADC
   7 channel 12 of the LTC2495 and the CPU_ID1 analog voltage
   8 level is obtained by reading ADC channel 13.
   9
  10 The ADC data register value read from the LTC2495 is a 24 bit value.
  11 For example, an ADC value that reads between 0xB3CF3E and 0xB9E79E
  12 indicates a 130k ohm resistor is populated on the daughtercard,
  13 which corresponds to ID level 20
  14
  15 By using CPU_ID0, CPU_ID1 to identify the board for example:
  16 CPU_ID0 = 21, CPU_ID1 = 15, MX53-EVK with DDR2 1GByte RevB
  17
  18 Signed-off-by:Jason Liu <r64343@freescale.com>
  19 ---
  20  board/freescale/mx53_evk/mx53_evk.c |  170 ++++++++++++++++++++++++++++++++++-
  21  1 files changed, 167 insertions(+), 3 deletions(-)
  22
  23 diff --git a/board/freescale/mx53_evk/mx53_evk.c b/board/freescale/mx53_evk/mx53_evk.c
  24 index 9526b2d..6be0b37 100644
  25 --- a/board/freescale/mx53_evk/mx53_evk.c
  26 +++ b/board/freescale/mx53_evk/mx53_evk.c
  27 @@ -282,6 +282,168 @@ void setup_core_voltages(void)
  28         /* Raise the core frequency to 800MHz */
  29         writel(0x0, CCM_BASE_ADDR + CLKCTL_CACRR);
  30  }
  31 +
  32 +static int __read_adc_channel(unsigned int chan)
  33 +{
  34 +       unsigned char buf[4] = { 0 };
  35 +
  36 +       buf[0] = (0xb0 | ((chan & 0x1) << 3) | ((chan >> 1) & 0x7));
  37 +
  38 +       /* LTC2495 need 410ms delay */
  39 +       udelay(410000);
  40 +
  41 +       if (i2c_write(0x14, chan, 0, &buf[0], 1)) {
  42 +               printf("%s:i2c_write:error\n", __func__);
  43 +               return -1;
  44 +       }
  45 +
  46 +       /* LTC2495 need 410ms delay*/
  47 +       udelay(410000);
  48 +
  49 +       if (i2c_read(0x14, chan, 0, &buf[0], 3)) {
  50 +               printf("%s:i2c_read:error\n", __func__);
  51 +               return -1;
  52 +       }
  53 +
  54 +       return buf[0] << 16 | buf[1] << 8 | buf[2];
  55 +}
  56 +
  57 +static int __lookup_board_id(int adc_val)
  58 +{
  59 +       int id;
  60 +
  61 +       if (adc_val < 0x3FFFC0)
  62 +               id = 0;
  63 +       else if (adc_val < 0x461863)
  64 +               id = 1;
  65 +       else if (adc_val < 0x4C30C4)
  66 +               id = 2;
  67 +       else if (adc_val < 0x524926)
  68 +               id = 3;
  69 +       else if (adc_val < 0x586187)
  70 +               id = 4;
  71 +       else if (adc_val < 0x5E79E9)
  72 +               id = 5;
  73 +       else if (adc_val < 0x64924A)
  74 +               id = 6;
  75 +       else if (adc_val < 0x6AAAAC)
  76 +               id = 7;
  77 +       else if (adc_val < 0x70C30D)
  78 +               id = 8;
  79 +       else if (adc_val < 0x76DB6F)
  80 +               id = 9;
  81 +       else if (adc_val < 0x7CF3D0)
  82 +               id = 10;
  83 +       else if (adc_val < 0x830C32)
  84 +               id = 11;
  85 +       else if (adc_val < 0x892493)
  86 +               id = 12;
  87 +       else if (adc_val < 0x8F3CF5)
  88 +               id = 13;
  89 +       else if (adc_val < 0x955556)
  90 +               id = 14;
  91 +       else if (adc_val < 0x9B6DB8)
  92 +               id = 15;
  93 +       else if (adc_val < 0xA18619)
  94 +               id = 16;
  95 +       else if (adc_val < 0xA79E7B)
  96 +               id = 17;
  97 +       else if (adc_val < 0xADB6DC)
  98 +               id = 18;
  99 +       else if (adc_val < 0xB3CF3E)
 100 +               id = 19;
 101 +       else if (adc_val < 0xB9E79F)
 102 +               id = 20;
 103 +       else if (adc_val < 0xC00000)
 104 +               id = 21;
 105 +               else
 106 +               return -1;
 107 +
 108 +       return id;
 109 +}
 110 +
 111 +static int __print_board_info(int id0, int id1)
 112 +{
 113 +       int ret = 0;
 114 +
 115 +       switch (id0) {
 116 +       case 21:
 117 +               switch (id1) {
 118 +               case 15:
 119 +                       printf("MX53-EVK with DDR2 1GByte RevB\n");
 120 +
 121 +                       break;
 122 +               case 18:
 123 +                       printf("MX53-EVK with DDR2 2GByte RevA1\n");
 124 +
 125 +                       break;
 126 +               case 19:
 127 +                       printf("MX53-EVK with DDR2 2GByte RevA2\n");
 128 +                       break;
 129 +               default:
 130 +                       printf("Unkown board id1:%d\n", id1);
 131 +                       ret = -1;
 132 +
 133 +                       break;
 134 +               }
 135 +
 136 +               break;
 137 +       case 11:
 138 +               switch (id1) {
 139 +               case 1:
 140 +                       printf("MX53 1.5V DDR3 x8 CPU Card, Rev. A\n");
 141 +
 142 +                       break;
 143 +               case 11:
 144 +                       printf("MX53 1.8V DDR2 x8 CPU Card, Rev. A\n");
 145 +
 146 +                       break;
 147 +               default:
 148 +                       printf("Unkown board id1:%d\n", id1);
 149 +                       ret = -1;
 150 +
 151 +                       break;
 152 +               }
 153 +
 154 +               break;
 155 +       default:
 156 +               printf("Unkown board id0:%d\n", id0);
 157 +
 158 +               break;
 159 +       }
 160 +
 161 +       return ret;
 162 +}
 163 +
 164 +int identify_board_id(void)
 165 +{
 166 +       int ret = 0;
 167 +       int bd_id0, bd_id1;
 168 +
 169 +#define CPU_CHANNEL_ID0 0xc
 170 +#define CPU_CHANNEL_ID1 0xd
 171 +
 172 +       ret = bd_id0 = __read_adc_channel(CPU_CHANNEL_ID0);
 173 +       if (ret < 0)
 174 +               return ret;
 175 +
 176 +       ret = bd_id1 = __read_adc_channel(CPU_CHANNEL_ID1);
 177 +       if (ret < 0)
 178 +               return ret;
 179 +
 180 +       ret = bd_id0 = __lookup_board_id(bd_id0);
 181 +       if (ret < 0)
 182 +               return ret;
 183 +
 184 +       ret = bd_id1 = __lookup_board_id(bd_id1);
 185 +       if (ret < 0)
 186 +               return ret;
 187 +
 188 +       ret = __print_board_info(bd_id0, bd_id1);
 189 +
 190 +       return ret;
 191 +
 192 +}
 193  #endif
 194
 195  void spi_io_init(struct imx_spi_dev_t *dev)
 196 @@ -520,10 +682,12 @@ int board_late_init(void)
 197
 198  int checkboard(void)
 199  {
 200 -       printf("Board: MX53 EVK ");
 201 -
 202 -       printf("1.0 [");
 203 +       printf("Board:   ");
 204
 205 +#ifdef CONFIG_I2C_MXC
 206 +       identify_board_id();
 207 +#endif
 208 +       printf("Boot Reason: [");
 209
 210         switch (__REG(SRC_BASE_ADDR + 0x8)) {
 211         case 0x0001:
 212 --
 213 1.5.4.4
 214