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![Qin Jian](/assets/img/avatar_default.png)
Add reset driver for Sunplus SP7021 SoC. Signed-off-by: Qin Jian <qinjian@cqplus1.com> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
212 lines
3.7 KiB
C
212 lines
3.7 KiB
C
// 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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0x02,
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0x03,
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0x04,
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0x05,
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0x06,
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0x07,
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0x08,
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0x09,
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0x0a,
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0x0b,
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0x0d,
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0x0e,
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0x0f,
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0x10,
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0x12,
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0x14,
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0x15,
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0x16,
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0x17,
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0x18,
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0x19,
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0x1a,
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0x1b,
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0x1c,
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0x1d,
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0x1e,
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0x1f,
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0x20,
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0x21,
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0x22,
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0x23,
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0x24,
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0x25,
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0x26,
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0x2a,
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0x2b,
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0x2d,
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0x2e,
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0x30,
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0x31,
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0x32,
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0x33,
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0x3d,
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0x3e,
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0x3f,
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0x42,
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0x44,
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0x4b,
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0x4c,
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0x4d,
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0x4e,
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0x4f,
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0x50,
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0x55,
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0x60,
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0x61,
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0x6a,
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0x6f,
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0x70,
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0x73,
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0x74,
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0x86,
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0x8a,
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0x8b,
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0x8d,
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0x8e,
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0x8f,
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0x90,
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0x92,
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0x93,
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0x94,
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0x95,
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0x96,
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0x97,
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0x98,
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0x99,
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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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