drivers/misc/esm_pmic.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * PMIC Error Signal Monitor driver
   4  *
   5  * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
   6  *      Tero Kristo <[email protected]>
   7  *
   8  */
   9
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <errno.h>
  13 #include <power/pmic.h>
  14 #include <dm/device_compat.h>
  15 #include <linux/bitops.h>
  16
  17 #define INT_ESM_REG             0x6c
  18 #define INT_ESM_MASK            0x3f
  19
  20 #define ESM_MCU_START_REG       0x8f
  21
  22 #define ESM_MCU_START           BIT(0)
  23
  24 #define ESM_MCU_MODE_CFG_REG    0x92
  25
  26 #define ESM_MCU_EN              BIT(6)
  27 #define ESM_MCU_ENDRV           BIT(5)
  28
  29 #define ESM_MCU_MASK_REG        0x59
  30 #define ESM_MCU_MASK            0x7
  31
  32 /**
  33  * pmic_esm_probe: configures and enables PMIC ESM functionality
  34  *
  35  * Configures ESM PMIC support and enables it.
  36  */
  37 static int pmic_esm_probe(struct udevice *dev)
  38 {
  39         int ret;
  40
  41         ret = pmic_reg_write(dev->parent, INT_ESM_REG, INT_ESM_MASK);
  42         if (ret) {
  43                 dev_err(dev, "clearing ESM irqs failed: %d\n", ret);
  44                 return ret;
  45         }
  46
  47         ret = pmic_reg_write(dev->parent, ESM_MCU_MODE_CFG_REG,
  48                              ESM_MCU_EN | ESM_MCU_ENDRV);
  49         if (ret) {
  50                 dev_err(dev, "setting ESM mode failed: %d\n", ret);
  51                 return ret;
  52         }
  53
  54         ret = pmic_reg_write(dev->parent, ESM_MCU_MASK_REG, ESM_MCU_MASK);
  55         if (ret) {
  56                 dev_err(dev, "clearing ESM masks failed: %d\n", ret);
  57                 return ret;
  58         }
  59
  60         ret = pmic_reg_write(dev->parent, ESM_MCU_START_REG, ESM_MCU_START);
  61         if (ret) {
  62                 dev_err(dev, "starting ESM failed: %d\n", ret);
  63                 return ret;
  64         }
  65
  66         return 0;
  67 }
  68
  69 static const struct udevice_id pmic_esm_ids[] = {
  70         { .compatible = "ti,tps659413-esm" },
  71         {}
  72 };
  73
  74 U_BOOT_DRIVER(pmic_esm) = {
  75         .name = "esm_pmic",
  76         .of_match = pmic_esm_ids,
  77         .id = UCLASS_MISC,
  78         .probe = pmic_esm_probe,
  79 };