board/atmel/common/board.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 Microchip
   4  *                    Wenyou Yang <wenyou.yang@microchip.com>
   5  */
   6
   7 #include <common.h>
   8 #include <w1.h>
   9 #include <w1-eeprom.h>
  10 #include <dm/device-internal.h>
  11
  12 #define AT91_PDA_EEPROM_ID_OFFSET               15
  13 #define AT91_PDA_EEPROM_ID_LENGTH               5
  14 #define AT91_PDA_EEPROM_DEFAULT_BUS             0
  15
  16 char *get_cpu_name(void);
  17
  18 void dummy(void)
  19 {
  20 }
  21
  22 #if defined CONFIG_W1
  23 void at91_pda_detect(void)
  24 {
  25         struct udevice *bus, *dev;
  26         u8 buf[AT91_PDA_EEPROM_ID_LENGTH + 1] = {0};
  27         int ret;
  28         int pda = 0;
  29
  30         ret = w1_get_bus(AT91_PDA_EEPROM_DEFAULT_BUS, &bus);
  31         if (ret)
  32                 goto pda_detect_err;
  33
  34         for (device_find_first_child(bus, &dev);
  35              dev;
  36              device_find_next_child(&dev)) {
  37                 ret = device_probe(dev);
  38                 if (ret) {
  39                         continue;
  40                 } else {
  41                         ret = w1_eeprom_read_buf(dev, AT91_PDA_EEPROM_ID_OFFSET,
  42                                                  (u8 *)buf, AT91_PDA_EEPROM_ID_LENGTH);
  43                         if (ret)
  44                                 goto pda_detect_err;
  45                         break;
  46                 }
  47         }
  48         pda = simple_strtoul((const char *)buf, NULL, 10);
  49
  50         switch (pda) {
  51         case 7000:
  52                 if (buf[4] == 'B')
  53                         printf("PDA TM7000B detected\n");
  54                 else
  55                         printf("PDA TM7000 detected\n");
  56                 break;
  57         case 4300:
  58                 printf("PDA TM4300 detected\n");
  59                 break;
  60         case 5000:
  61                 printf("PDA TM5000 detected\n");
  62                 break;
  63         }
  64
  65 pda_detect_err:
  66         env_set("pda", (const char *)buf);
  67 }
  68 #else
  69 void at91_pda_detect(void)
  70 {
  71 }
  72 #endif
  73
  74 void at91_prepare_cpu_var(void)
  75 {
  76         env_set("cpu", get_cpu_name());
  77 }