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