src/drivers/i2c/nct7802y/nct7802y_peci.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <types.h>
   4 #include <device/device.h>
   5
   6 #include "nct7802y.h"
   7 #include "chip.h"
   8
   9 void nct7802y_init_peci(struct device *const dev)
  10 {
  11         const struct drivers_i2c_nct7802y_config *const config = dev->chip_info;
  12         unsigned int i, all_off = 1;
  13
  14         /* Bank 1 can only be written to if PECI reading is enabled */
  15         if (nct7802y_select_bank(dev, 0) != CB_SUCCESS)
  16                 return;
  17         nct7802y_update(dev, PECI_ENABLE, 0, PECI_ENABLE_AGENTx(0));
  18
  19         if (nct7802y_select_bank(dev, 1) != CB_SUCCESS)
  20                 return;
  21
  22         for (i = 0; i < NCT7802Y_PECI_CNT; ++i) {
  23                 if (config->peci[i].mode != PECI_DISABLED) {
  24                         u8 ctrl3 = 0, style = 0;
  25                         switch (config->peci[i].mode) {
  26                         case PECI_DOMAIN_0:
  27                                 ctrl3 = PECI_CTRL_3_EN_AGENTx(i);
  28                                 style = PECI_TEMP_STYLE_DOM0_AGENTx(i) |
  29                                         PECI_TEMP_STYLE_SINGLE;
  30                                 break;
  31                         case PECI_DOMAIN_1:
  32                                 ctrl3 = PECI_CTRL_3_EN_AGENTx(i) |
  33                                         PECI_CTRL_3_HAS_DOM1_AGENTx(i);
  34                                 style = PECI_TEMP_STYLE_DOM1_AGENTx(i) |
  35                                         PECI_TEMP_STYLE_SINGLE;
  36                                 break;
  37                         case PECI_HIGHEST:
  38                                 ctrl3 = PECI_CTRL_3_EN_AGENTx(i) |
  39                                         PECI_CTRL_3_HAS_DOM1_AGENTx(i);
  40                                 style = PECI_TEMP_STYLE_HIGHEST;
  41                                 break;
  42                         default:
  43                                 break;
  44                         }
  45                         nct7802y_update(dev, PECI_CTRL_1,
  46                                         PECI_CTRL_1_MANUAL_EN,
  47                                         PECI_CTRL_1_EN |
  48                                                 PECI_CTRL_1_ROUTINE_EN);
  49                         nct7802y_update(dev, PECI_CTRL_3,
  50                                         PECI_CTRL_3_HAS_DOM1_AGENTx(i), ctrl3);
  51                         nct7802y_update(dev, PECI_REPORT_TEMP_STYLE,
  52                                         PECI_TEMP_STYLE_DOM1_AGENTx(i) |
  53                                                 PECI_TEMP_STYLE_HIGHEST,
  54                                         style);
  55                         nct7802y_write(dev, PECI_BASE_TEMP_AGENT(i),
  56                                        config->peci[i].base_temp);
  57                         all_off = 0;
  58                 } else {
  59                         nct7802y_update(dev, PECI_CTRL_3,
  60                                         PECI_CTRL_3_EN_AGENTx(i), 0);
  61                 }
  62         }
  63
  64         if (all_off)
  65                 nct7802y_update(dev, PECI_CTRL_1, PECI_CTRL_1_EN, 0);
  66
  67         /* Disable PECI #0 reading if we only enabled it to access bank 1 */
  68         if (config->peci[0].mode == PECI_DISABLED) {
  69                 if (nct7802y_select_bank(dev, 0) != CB_SUCCESS)
  70                         return;
  71
  72                 nct7802y_update(dev, PECI_ENABLE, PECI_ENABLE_AGENTx(0), 0);
  73         }
  74 }