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 <t-kristo@ti.com>
   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
  16 #define INT_ESM_REG             0x6c
  17 #define INT_ESM_MASK            0x3f
  18
  19 #define ESM_MCU_START_REG       0x8f
  20
  21 #define ESM_MCU_START           BIT(0)
  22
  23 #define ESM_MCU_MODE_CFG_REG    0x92
  24
  25 #define ESM_MCU_EN              BIT(6)
  26 #define ESM_MCU_ENDRV           BIT(5)
  27
  28 /**
  29  * pmic_esm_probe: configures and enables PMIC ESM functionality
  30  *
  31  * Configures ESM PMIC support and enables it.
  32  */
  33 static int pmic_esm_probe(struct udevice *dev)
  34 {
  35         int ret;
  36
  37         ret = pmic_reg_write(dev->parent, INT_ESM_REG, INT_ESM_MASK);
  38         if (ret) {
  39                 dev_err(dev, "clearing ESM irqs failed: %d\n", ret);
  40                 return ret;
  41         }
  42
  43         ret = pmic_reg_write(dev->parent, ESM_MCU_MODE_CFG_REG,
  44                              ESM_MCU_EN | ESM_MCU_ENDRV);
  45         if (ret) {
  46                 dev_err(dev, "setting ESM mode failed: %d\n", ret);
  47                 return ret;
  48         }
  49
  50         ret = pmic_reg_write(dev->parent, ESM_MCU_START_REG, ESM_MCU_START);
  51         if (ret) {
  52                 dev_err(dev, "starting ESM failed: %d\n", ret);
  53                 return ret;
  54         }
  55
  56         return 0;
  57 }
  58
  59 static const struct udevice_id pmic_esm_ids[] = {
  60         { .compatible = "ti,tps659413-esm" },
  61         {}
  62 };
  63
  64 U_BOOT_DRIVER(pmic_esm) = {
  65         .name = "esm_pmic",
  66         .of_match = pmic_esm_ids,
  67         .id = UCLASS_MISC,
  68         .probe = pmic_esm_probe,
  69 };