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 #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 /**
  30  * pmic_esm_probe: configures and enables PMIC ESM functionality
  31  *
  32  * Configures ESM PMIC support and enables it.
  33  */
  34 static int pmic_esm_probe(struct udevice *dev)
  35 {
  36         int ret;
  37
  38         ret = pmic_reg_write(dev->parent, INT_ESM_REG, INT_ESM_MASK);
  39         if (ret) {
  40                 dev_err(dev, "clearing ESM irqs failed: %d\n", ret);
  41                 return ret;
  42         }
  43
  44         ret = pmic_reg_write(dev->parent, ESM_MCU_MODE_CFG_REG,
  45                              ESM_MCU_EN | ESM_MCU_ENDRV);
  46         if (ret) {
  47                 dev_err(dev, "setting ESM mode failed: %d\n", ret);
  48                 return ret;
  49         }
  50
  51         ret = pmic_reg_write(dev->parent, ESM_MCU_START_REG, ESM_MCU_START);
  52         if (ret) {
  53                 dev_err(dev, "starting ESM failed: %d\n", ret);
  54                 return ret;
  55         }
  56
  57         return 0;
  58 }
  59
  60 static const struct udevice_id pmic_esm_ids[] = {
  61         { .compatible = "ti,tps659413-esm" },
  62         {}
  63 };
  64
  65 U_BOOT_DRIVER(pmic_esm) = {
  66         .name = "esm_pmic",
  67         .of_match = pmic_esm_ids,
  68         .id = UCLASS_MISC,
  69         .probe = pmic_esm_probe,
  70 };