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212 lines
3.7 KiB
212 lines
3.7 KiB
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
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/* |
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* SP7021 reset driver |
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* |
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* Copyright (C) Sunplus Technology Co., Ltd. |
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* All rights reserved. |
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*/ |
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#include <linux/io.h> |
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#include <linux/init.h> |
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#include <linux/mod_devicetable.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/reboot.h> |
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/* HIWORD_MASK_REG BITS */ |
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#define BITS_PER_HWM_REG 16 |
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/* resets HW info: reg_index_shift */ |
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static const u32 sp_resets[] = { |
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/* SP7021: mo_reset0 ~ mo_reset9 */ |
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0x00, |
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}; |
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struct sp_reset { |
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struct reset_controller_dev rcdev; |
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struct notifier_block notifier; |
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void __iomem *base; |
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}; |
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static inline struct sp_reset *to_sp_reset(struct reset_controller_dev *rcdev) |
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{ |
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return container_of(rcdev, struct sp_reset, rcdev); |
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} |
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static int sp_reset_update(struct reset_controller_dev *rcdev, |
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unsigned long id, bool assert) |
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{ |
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struct sp_reset *reset = to_sp_reset(rcdev); |
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int index = sp_resets[id] / BITS_PER_HWM_REG; |
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int shift = sp_resets[id] % BITS_PER_HWM_REG; |
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u32 val; |
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val = (1 << (16 + shift)) | (assert << shift); |
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writel(val, reset->base + (index * 4)); |
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return 0; |
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} |
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static int sp_reset_assert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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return sp_reset_update(rcdev, id, true); |
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} |
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static int sp_reset_deassert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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return sp_reset_update(rcdev, id, false); |
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} |
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static int sp_reset_status(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct sp_reset *reset = to_sp_reset(rcdev); |
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int index = sp_resets[id] / BITS_PER_HWM_REG; |
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int shift = sp_resets[id] % BITS_PER_HWM_REG; |
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u32 reg; |
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reg = readl(reset->base + (index * 4)); |
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return !!(reg & BIT(shift)); |
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} |
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static const struct reset_control_ops sp_reset_ops = { |
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.assert = sp_reset_assert, |
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.deassert = sp_reset_deassert, |
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.status = sp_reset_status, |
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}; |
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static int sp_restart(struct notifier_block *nb, unsigned long mode, |
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void *cmd) |
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{ |
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struct sp_reset *reset = container_of(nb, struct sp_reset, notifier); |
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sp_reset_assert(&reset->rcdev, 0); |
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sp_reset_deassert(&reset->rcdev, 0); |
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return NOTIFY_DONE; |
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} |
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static int sp_reset_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct sp_reset *reset; |
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struct resource *res; |
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int ret; |
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reset = devm_kzalloc(dev, sizeof(*reset), GFP_KERNEL); |
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if (!reset) |
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return -ENOMEM; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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reset->base = devm_ioremap_resource(dev, res); |
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if (IS_ERR(reset->base)) |
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return PTR_ERR(reset->base); |
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reset->rcdev.ops = &sp_reset_ops; |
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reset->rcdev.owner = THIS_MODULE; |
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reset->rcdev.of_node = dev->of_node; |
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reset->rcdev.nr_resets = resource_size(res) / 4 * BITS_PER_HWM_REG; |
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ret = devm_reset_controller_register(dev, &reset->rcdev); |
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if (ret) |
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return ret; |
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reset->notifier.notifier_call = sp_restart; |
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reset->notifier.priority = 192; |
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return register_restart_handler(&reset->notifier); |
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} |
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static const struct of_device_id sp_reset_dt_ids[] = { |
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{.compatible = "sunplus,sp7021-reset",}, |
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{ /* sentinel */ }, |
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}; |
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static struct platform_driver sp_reset_driver = { |
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.probe = sp_reset_probe, |
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.driver = { |
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.name = "sunplus-reset", |
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.of_match_table = sp_reset_dt_ids, |
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.suppress_bind_attrs = true, |
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}, |
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}; |
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builtin_platform_driver(sp_reset_driver);
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