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 - https://www.ti.com/
   6  *      Tero Kristo <t-kristo@ti.com>
   7  *
   8  */
   9
  10 #include <dm.h>
  11 #include <errno.h>
  12 #include <power/pmic.h>
  13 #include <dm/device_compat.h>
  14 #include <linux/bitops.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 #define ESM_MCU_MASK_REG        0x59
  29 #define ESM_MCU_MASK            0x7
  30
  31 /**
  32  * pmic_esm_probe: configures and enables PMIC ESM functionality
  33  *
  34  * Configures ESM PMIC support and enables it.
  35  */
  36 static int pmic_esm_probe(struct udevice *dev)
  37 {
  38         int ret;
  39
  40         ret = pmic_reg_write(dev->parent, INT_ESM_REG, INT_ESM_MASK);
  41         if (ret) {
  42                 dev_err(dev, "clearing ESM irqs failed: %d\n", ret);
  43                 return ret;
  44         }
  45
  46         ret = pmic_reg_write(dev->parent, ESM_MCU_MODE_CFG_REG,
  47                              ESM_MCU_EN | ESM_MCU_ENDRV);
  48         if (ret) {
  49                 dev_err(dev, "setting ESM mode failed: %d\n", ret);
  50                 return ret;
  51         }
  52
  53         ret = pmic_reg_write(dev->parent, ESM_MCU_MASK_REG, ESM_MCU_MASK);
  54         if (ret) {
  55                 dev_err(dev, "clearing ESM masks failed: %d\n", ret);
  56                 return ret;
  57         }
  58
  59         ret = pmic_reg_write(dev->parent, ESM_MCU_START_REG, ESM_MCU_START);
  60         if (ret) {
  61                 dev_err(dev, "starting ESM failed: %d\n", ret);
  62                 return ret;
  63         }
  64
  65         return 0;
  66 }
  67
  68 static const struct udevice_id pmic_esm_ids[] = {
  69         { .compatible = "ti,tps659413-esm" },
  70         {}
  71 };
  72
  73 U_BOOT_DRIVER(pmic_esm) = {
  74         .name = "esm_pmic",
  75         .of_match = pmic_esm_ids,
  76         .id = UCLASS_MISC,
  77         .probe = pmic_esm_probe,
  78 };