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84 lines
2.1 KiB
84 lines
2.1 KiB
/* |
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* Copyright (C) 2017 Synopsys. |
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* |
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* Synopsys AXS10x reset driver. |
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* |
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* This file is licensed under the terms of the GNU General Public |
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* License version 2. This program is licensed "as is" without any |
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* warranty of any kind, whether express or implied. |
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*/ |
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#include <linux/io.h> |
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#include <linux/module.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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#define to_axs10x_rst(p) container_of((p), struct axs10x_rst, rcdev) |
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#define AXS10X_MAX_RESETS 32 |
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struct axs10x_rst { |
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void __iomem *regs_rst; |
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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 axs10x_reset_reset(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct axs10x_rst *rst = to_axs10x_rst(rcdev); |
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unsigned long flags; |
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spin_lock_irqsave(&rst->lock, flags); |
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writel(BIT(id), rst->regs_rst); |
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spin_unlock_irqrestore(&rst->lock, flags); |
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return 0; |
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} |
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static const struct reset_control_ops axs10x_reset_ops = { |
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.reset = axs10x_reset_reset, |
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}; |
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static int axs10x_reset_probe(struct platform_device *pdev) |
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{ |
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struct axs10x_rst *rst; |
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struct resource *mem; |
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rst = devm_kzalloc(&pdev->dev, sizeof(*rst), GFP_KERNEL); |
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if (!rst) |
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return -ENOMEM; |
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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rst->regs_rst = devm_ioremap_resource(&pdev->dev, mem); |
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if (IS_ERR(rst->regs_rst)) |
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return PTR_ERR(rst->regs_rst); |
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spin_lock_init(&rst->lock); |
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rst->rcdev.owner = THIS_MODULE; |
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rst->rcdev.ops = &axs10x_reset_ops; |
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rst->rcdev.of_node = pdev->dev.of_node; |
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rst->rcdev.nr_resets = AXS10X_MAX_RESETS; |
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return devm_reset_controller_register(&pdev->dev, &rst->rcdev); |
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} |
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static const struct of_device_id axs10x_reset_dt_match[] = { |
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{ .compatible = "snps,axs10x-reset" }, |
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{ }, |
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}; |
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static struct platform_driver axs10x_reset_driver = { |
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.probe = axs10x_reset_probe, |
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.driver = { |
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.name = "axs10x-reset", |
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.of_match_table = axs10x_reset_dt_match, |
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}, |
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}; |
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builtin_platform_driver(axs10x_reset_driver); |
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MODULE_AUTHOR("Eugeniy Paltsev <[email protected]>"); |
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MODULE_DESCRIPTION("Synopsys AXS10x reset driver"); |
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MODULE_LICENSE("GPL v2");
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