83 lines · c
1/*2 * Copyright (C) 2017 Synopsys.3 *4 * Synopsys AXS10x reset driver.5 *6 * This file is licensed under the terms of the GNU General Public7 * License version 2. This program is licensed "as is" without any8 * warranty of any kind, whether express or implied.9 */10 11#include <linux/io.h>12#include <linux/module.h>13#include <linux/mod_devicetable.h>14#include <linux/platform_device.h>15#include <linux/reset-controller.h>16 17#define to_axs10x_rst(p) container_of((p), struct axs10x_rst, rcdev)18 19#define AXS10X_MAX_RESETS 3220 21struct axs10x_rst {22 void __iomem *regs_rst;23 spinlock_t lock;24 struct reset_controller_dev rcdev;25};26 27static int axs10x_reset_reset(struct reset_controller_dev *rcdev,28 unsigned long id)29{30 struct axs10x_rst *rst = to_axs10x_rst(rcdev);31 unsigned long flags;32 33 spin_lock_irqsave(&rst->lock, flags);34 writel(BIT(id), rst->regs_rst);35 spin_unlock_irqrestore(&rst->lock, flags);36 37 return 0;38}39 40static const struct reset_control_ops axs10x_reset_ops = {41 .reset = axs10x_reset_reset,42};43 44static int axs10x_reset_probe(struct platform_device *pdev)45{46 struct axs10x_rst *rst;47 48 rst = devm_kzalloc(&pdev->dev, sizeof(*rst), GFP_KERNEL);49 if (!rst)50 return -ENOMEM;51 52 rst->regs_rst = devm_platform_ioremap_resource(pdev, 0);53 if (IS_ERR(rst->regs_rst))54 return PTR_ERR(rst->regs_rst);55 56 spin_lock_init(&rst->lock);57 58 rst->rcdev.owner = THIS_MODULE;59 rst->rcdev.ops = &axs10x_reset_ops;60 rst->rcdev.of_node = pdev->dev.of_node;61 rst->rcdev.nr_resets = AXS10X_MAX_RESETS;62 63 return devm_reset_controller_register(&pdev->dev, &rst->rcdev);64}65 66static const struct of_device_id axs10x_reset_dt_match[] = {67 { .compatible = "snps,axs10x-reset" },68 { },69};70 71static struct platform_driver axs10x_reset_driver = {72 .probe = axs10x_reset_probe,73 .driver = {74 .name = "axs10x-reset",75 .of_match_table = axs10x_reset_dt_match,76 },77};78builtin_platform_driver(axs10x_reset_driver);79 80MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");81MODULE_DESCRIPTION("Synopsys AXS10x reset driver");82MODULE_LICENSE("GPL v2");83