mirror of
https://github.com/revyos/thead-kernel.git
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141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2017, Impinj, Inc.
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*
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* i.MX7 System Reset Controller (SRC) driver
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*
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* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
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*/
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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#include <linux/regmap.h>
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#include <dt-bindings/reset/light-reset.h>
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struct light_src_signal {
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unsigned int offset, bit;
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};
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struct light_src_variant {
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const struct light_src_signal *signals;
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unsigned int signals_num;
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struct reset_control_ops ops;
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};
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struct light_src {
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struct reset_controller_dev rcdev;
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struct regmap *regmap;
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const struct light_src_signal *signals;
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};
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enum light_src_registers {
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SRC_WDT0 = 0x0034,
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SRC_WDT1 = 0x0038,
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};
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static int light_reset_update(struct light_src *lightsrc,
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unsigned long id, unsigned int value)
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{
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const struct light_src_signal *signal = &lightsrc->signals[id];
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return regmap_update_bits(lightsrc->regmap,
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signal->offset, signal->bit, value);
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}
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static const struct light_src_signal light_src_signals[] = {
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[LIGHT_RESET_WDT0] = { SRC_WDT0, BIT(0) },
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[LIGHT_RESET_WDT1] = { SRC_WDT1, BIT(0) },
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};
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static struct light_src *to_light_src(struct reset_controller_dev *rcdev)
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{
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return container_of(rcdev, struct light_src, rcdev);
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}
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static int light_reset_set(struct reset_controller_dev *rcdev,
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unsigned long id, bool assert)
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{
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struct light_src *lightsrc = to_light_src(rcdev);
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const unsigned int bit = lightsrc->signals[id].bit;
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unsigned int value = assert ? bit : 0;
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switch (id) {
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/*add special dispatch*/
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default:
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break;
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}
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return light_reset_update(lightsrc, id, value);
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}
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static int light_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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pr_info("%s id:%u\n",__func__,id);
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return light_reset_set(rcdev, id, false);
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}
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static int light_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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pr_info("%s id:%u\n",__func__,id);
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return light_reset_set(rcdev, id, true);
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}
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static const struct light_src_variant variant_light = {
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.signals = light_src_signals,
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.signals_num = ARRAY_SIZE(light_src_signals),
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.ops = {
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.assert = light_reset_assert,
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.deassert = light_reset_deassert,
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},
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};
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static int light_reset_probe(struct platform_device *pdev)
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{
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struct light_src *lightsrc;
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struct device *dev = &pdev->dev;
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struct regmap_config config = { .name = "src" };
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const struct light_src_variant *variant = of_device_get_match_data(dev);
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lightsrc = devm_kzalloc(dev, sizeof(*lightsrc), GFP_KERNEL);
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if (!lightsrc)
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return -ENOMEM;
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lightsrc->signals = variant->signals;
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lightsrc->regmap = syscon_node_to_regmap(dev->of_node);
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if (IS_ERR(lightsrc->regmap)) {
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dev_err(dev, "Unable to get light-src regmap");
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return PTR_ERR(lightsrc->regmap);
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}
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regmap_attach_dev(dev, lightsrc->regmap, &config);
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lightsrc->rcdev.owner = THIS_MODULE;
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lightsrc->rcdev.nr_resets = variant->signals_num;
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lightsrc->rcdev.ops = &variant->ops;
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lightsrc->rcdev.of_node = dev->of_node;
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return devm_reset_controller_register(dev, &lightsrc->rcdev);
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}
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static const struct of_device_id light_reset_dt_ids[] = {
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{ .compatible = "thead,light-reset-src", .data = &variant_light },
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};
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MODULE_DEVICE_TABLE(of, light_reset_dt_ids);
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static struct platform_driver light_reset_driver = {
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.probe = light_reset_probe,
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.driver = {
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.name = KBUILD_MODNAME,
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.of_match_table = light_reset_dt_ids,
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},
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};
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module_platform_driver(light_reset_driver);
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MODULE_AUTHOR("zenglinghui.zlh <zenglinghui.zlh@linux.alibaba.com>");
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MODULE_DESCRIPTION("Thead light reset driver");
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MODULE_LICENSE("GPL v2");
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