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112 lines
2.6 KiB
112 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2014 STMicroelectronics |
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* |
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* Power off Restart driver, used in STMicroelectronics devices. |
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* |
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* Author: Christophe Kerello <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/reboot.h> |
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#include <linux/regmap.h> |
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struct reset_syscfg { |
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struct regmap *regmap; |
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/* syscfg used for reset */ |
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unsigned int offset_rst; |
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unsigned int mask_rst; |
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/* syscfg used for unmask the reset */ |
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unsigned int offset_rst_msk; |
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unsigned int mask_rst_msk; |
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}; |
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/* STiH407 */ |
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#define STIH407_SYSCFG_4000 0x0 |
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#define STIH407_SYSCFG_4008 0x20 |
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static struct reset_syscfg stih407_reset = { |
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.offset_rst = STIH407_SYSCFG_4000, |
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.mask_rst = BIT(0), |
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.offset_rst_msk = STIH407_SYSCFG_4008, |
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.mask_rst_msk = BIT(0) |
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}; |
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static struct reset_syscfg *st_restart_syscfg; |
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static int st_restart(struct notifier_block *this, unsigned long mode, |
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void *cmd) |
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{ |
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/* reset syscfg updated */ |
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regmap_update_bits(st_restart_syscfg->regmap, |
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st_restart_syscfg->offset_rst, |
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st_restart_syscfg->mask_rst, |
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0); |
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/* unmask the reset */ |
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regmap_update_bits(st_restart_syscfg->regmap, |
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st_restart_syscfg->offset_rst_msk, |
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st_restart_syscfg->mask_rst_msk, |
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0); |
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return NOTIFY_DONE; |
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} |
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static struct notifier_block st_restart_nb = { |
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.notifier_call = st_restart, |
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.priority = 192, |
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}; |
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static const struct of_device_id st_reset_of_match[] = { |
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{ |
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.compatible = "st,stih407-restart", |
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.data = (void *)&stih407_reset, |
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}, |
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{} |
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}; |
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static int st_reset_probe(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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const struct of_device_id *match; |
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struct device *dev = &pdev->dev; |
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match = of_match_device(st_reset_of_match, dev); |
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if (!match) |
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return -ENODEV; |
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st_restart_syscfg = (struct reset_syscfg *)match->data; |
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st_restart_syscfg->regmap = |
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syscon_regmap_lookup_by_phandle(np, "st,syscfg"); |
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if (IS_ERR(st_restart_syscfg->regmap)) { |
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dev_err(dev, "No syscfg phandle specified\n"); |
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return PTR_ERR(st_restart_syscfg->regmap); |
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} |
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return register_restart_handler(&st_restart_nb); |
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} |
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static struct platform_driver st_reset_driver = { |
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.probe = st_reset_probe, |
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.driver = { |
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.name = "st_reset", |
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.of_match_table = st_reset_of_match, |
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}, |
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}; |
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static int __init st_reset_init(void) |
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{ |
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return platform_driver_register(&st_reset_driver); |
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} |
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device_initcall(st_reset_init); |
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MODULE_AUTHOR("Christophe Kerello <[email protected]>"); |
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MODULE_DESCRIPTION("STMicroelectronics Power off Restart driver"); |
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MODULE_LICENSE("GPL v2");
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