100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
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/*
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* ZTE's zx2967 family reset controller driver
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*
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* Copyright (C) 2017 ZTE Ltd.
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*
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* Author: Baoyou Xie <baoyou.xie@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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struct zx2967_reset {
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void __iomem *reg_base;
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spinlock_t lock;
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struct reset_controller_dev rcdev;
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};
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static int zx2967_reset_act(struct reset_controller_dev *rcdev,
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unsigned long id, bool assert)
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{
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struct zx2967_reset *reset = NULL;
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int bank = id / 32;
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int offset = id % 32;
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u32 reg;
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unsigned long flags;
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reset = container_of(rcdev, struct zx2967_reset, rcdev);
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spin_lock_irqsave(&reset->lock, flags);
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reg = readl_relaxed(reset->reg_base + (bank * 4));
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if (assert)
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reg &= ~BIT(offset);
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else
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reg |= BIT(offset);
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writel_relaxed(reg, reset->reg_base + (bank * 4));
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spin_unlock_irqrestore(&reset->lock, flags);
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return 0;
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}
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static int zx2967_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return zx2967_reset_act(rcdev, id, true);
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}
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static int zx2967_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return zx2967_reset_act(rcdev, id, false);
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}
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static struct reset_control_ops zx2967_reset_ops = {
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.assert = zx2967_reset_assert,
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.deassert = zx2967_reset_deassert,
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};
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static int zx2967_reset_probe(struct platform_device *pdev)
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{
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struct zx2967_reset *reset;
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struct resource *res;
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reset = devm_kzalloc(&pdev->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->reg_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(reset->reg_base))
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return PTR_ERR(reset->reg_base);
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spin_lock_init(&reset->lock);
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reset->rcdev.owner = THIS_MODULE;
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reset->rcdev.nr_resets = resource_size(res) * 8;
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reset->rcdev.ops = &zx2967_reset_ops;
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reset->rcdev.of_node = pdev->dev.of_node;
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return devm_reset_controller_register(&pdev->dev, &reset->rcdev);
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}
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static const struct of_device_id zx2967_reset_dt_ids[] = {
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{ .compatible = "zte,zx296718-reset", },
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{},
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};
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static struct platform_driver zx2967_reset_driver = {
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.probe = zx2967_reset_probe,
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.driver = {
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.name = "zx2967-reset",
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.of_match_table = zx2967_reset_dt_ids,
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},
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};
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builtin_platform_driver(zx2967_reset_driver);
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