src/mainboard/google/asurada/boardid.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <assert.h>
   4 #include <boardid.h>
   5 #include <console/console.h>
   6 #include <soc/auxadc.h>
   7
   8 /* board_id is provided by ec/google/chromeec/ec_boardid.c */
   9
  10 #define ADC_LEVELS 15
  11
  12 enum {
  13         /* RAM IDs */
  14         RAM_ID_HIGH_CHANNEL = 4,
  15         RAM_ID_LOW_CHANNEL = 3,
  16         /* SKU IDs */
  17         SKU_ID_HIGH_CHANNEL = 6,
  18         SKU_ID_LOW_CHANNEL = 5,
  19 };
  20
  21 static const unsigned int ram_voltages[ADC_LEVELS] = {
  22         /* ID : Voltage (unit: uV) */
  23         [0]  =   74300,
  24         [1]  =  211700,
  25         [2]  =  318800,
  26         [3]  =  428600,
  27         [4]  =  541700,
  28         [5]  =  665800,
  29         [6]  =  781400,
  30         [7]  =  900000,
  31         [8]  = 1023100,
  32         [9]  = 1137000,
  33         [10] = 1240000,
  34         [11] = 1342600,
  35         [12] = 1457500,
  36         [13] = 1575600,
  37         [14] = 1683600,
  38 };
  39
  40 static const unsigned int *adc_voltages[] = {
  41         [RAM_ID_HIGH_CHANNEL] = ram_voltages,
  42         [RAM_ID_LOW_CHANNEL] = ram_voltages,
  43         [SKU_ID_HIGH_CHANNEL] = ram_voltages,
  44         [SKU_ID_LOW_CHANNEL] = ram_voltages,
  45 };
  46
  47 static uint32_t get_adc_index(unsigned int channel)
  48 {
  49         unsigned int value = auxadc_get_voltage_uv(channel);
  50
  51         assert(channel < ARRAY_SIZE(adc_voltages));
  52         const unsigned int *voltages = adc_voltages[channel];
  53         assert(voltages);
  54
  55         /* Find the closest voltage */
  56         uint32_t id;
  57         for (id = 0; id < ADC_LEVELS - 1; id++)
  58                 if (value < (voltages[id] + voltages[id + 1]) / 2)
  59                         break;
  60
  61         printk(BIOS_DEBUG, "ADC[%u]: Raw value=%u ID=%u\n", channel, value, id);
  62         return id;
  63 }
  64
  65 uint32_t sku_id(void)
  66 {
  67         static uint32_t cached_sku_code = BOARD_ID_INIT;
  68
  69         if (cached_sku_code == BOARD_ID_INIT) {
  70                 cached_sku_code = (get_adc_index(SKU_ID_HIGH_CHANNEL) << 4 |
  71                                    get_adc_index(SKU_ID_LOW_CHANNEL));
  72                 printk(BIOS_DEBUG, "SKU Code: %#02x\n", cached_sku_code);
  73         }
  74
  75         return cached_sku_code;
  76 }
  77
  78 uint32_t ram_code(void)
  79 {
  80         static uint32_t cached_ram_code = BOARD_ID_INIT;
  81
  82         if (cached_ram_code == BOARD_ID_INIT) {
  83                 cached_ram_code = (get_adc_index(RAM_ID_HIGH_CHANNEL) << 4 |
  84                                    get_adc_index(RAM_ID_LOW_CHANNEL));
  85                 printk(BIOS_DEBUG, "RAM Code: %#02x\n", cached_ram_code);
  86         }
  87
  88         return cached_ram_code;
  89 }