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https://github.com/brain-hackers/u-boot-brain
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The ESM (Error Signal Monitor) is used on certain PMIC versions to handle error signals propagating from rest of the system. If these reach the PMIC, it is typically a last resort fatal error which requires a system reset. The ESM driver does the proper configuration for the ESM module to reach this end goal. Initially, only TPS65941 PMIC is supported for this. Signed-off-by: Tero Kristo <t-kristo@ti.com>
70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* PMIC Error Signal Monitor driver
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*
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* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
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* Tero Kristo <t-kristo@ti.com>
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*
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <power/pmic.h>
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#include <dm/device_compat.h>
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#define INT_ESM_REG 0x6c
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#define INT_ESM_MASK 0x3f
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#define ESM_MCU_START_REG 0x8f
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#define ESM_MCU_START BIT(0)
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#define ESM_MCU_MODE_CFG_REG 0x92
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#define ESM_MCU_EN BIT(6)
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#define ESM_MCU_ENDRV BIT(5)
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/**
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* pmic_esm_probe: configures and enables PMIC ESM functionality
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*
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* Configures ESM PMIC support and enables it.
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*/
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static int pmic_esm_probe(struct udevice *dev)
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{
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int ret;
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ret = pmic_reg_write(dev->parent, INT_ESM_REG, INT_ESM_MASK);
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if (ret) {
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dev_err(dev, "clearing ESM irqs failed: %d\n", ret);
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return ret;
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}
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ret = pmic_reg_write(dev->parent, ESM_MCU_MODE_CFG_REG,
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ESM_MCU_EN | ESM_MCU_ENDRV);
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if (ret) {
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dev_err(dev, "setting ESM mode failed: %d\n", ret);
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return ret;
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}
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ret = pmic_reg_write(dev->parent, ESM_MCU_START_REG, ESM_MCU_START);
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if (ret) {
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dev_err(dev, "starting ESM failed: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static const struct udevice_id pmic_esm_ids[] = {
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{ .compatible = "ti,tps659413-esm" },
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{}
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};
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U_BOOT_DRIVER(pmic_esm) = {
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.name = "esm_pmic",
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.of_match = pmic_esm_ids,
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.id = UCLASS_MISC,
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.probe = pmic_esm_probe,
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};
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