177 строки
3.8 KiB
C
177 строки
3.8 KiB
C
/*
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* System Control Driver
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*
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* Copyright (C) 2012 Freescale Semiconductor, Inc.
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* Copyright (C) 2012 Linaro Ltd.
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*
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* Author: Dong Aisheng <dong.aisheng@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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static struct platform_driver syscon_driver;
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struct syscon {
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struct device *dev;
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void __iomem *base;
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struct regmap *regmap;
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};
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static int syscon_match(struct device *dev, void *data)
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{
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struct syscon *syscon = dev_get_drvdata(dev);
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struct device_node *dn = data;
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return (syscon->dev->of_node == dn) ? 1 : 0;
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}
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struct regmap *syscon_node_to_regmap(struct device_node *np)
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{
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struct syscon *syscon;
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struct device *dev;
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dev = driver_find_device(&syscon_driver.driver, NULL, np,
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syscon_match);
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if (!dev)
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return ERR_PTR(-EPROBE_DEFER);
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syscon = dev_get_drvdata(dev);
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return syscon->regmap;
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}
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EXPORT_SYMBOL_GPL(syscon_node_to_regmap);
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struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
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{
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struct device_node *syscon_np;
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struct regmap *regmap;
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syscon_np = of_find_compatible_node(NULL, NULL, s);
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if (!syscon_np)
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return ERR_PTR(-ENODEV);
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regmap = syscon_node_to_regmap(syscon_np);
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of_node_put(syscon_np);
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return regmap;
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}
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EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
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struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
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const char *property)
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{
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struct device_node *syscon_np;
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struct regmap *regmap;
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syscon_np = of_parse_phandle(np, property, 0);
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if (!syscon_np)
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return ERR_PTR(-ENODEV);
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regmap = syscon_node_to_regmap(syscon_np);
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of_node_put(syscon_np);
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return regmap;
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}
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EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
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static const struct of_device_id of_syscon_match[] = {
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{ .compatible = "syscon", },
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{ },
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};
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static struct regmap_config syscon_regmap_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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};
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static int syscon_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct syscon *syscon;
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struct resource res;
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int ret;
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if (!np)
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return -ENOENT;
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syscon = devm_kzalloc(dev, sizeof(struct syscon),
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GFP_KERNEL);
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if (!syscon)
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return -ENOMEM;
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syscon->base = of_iomap(np, 0);
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if (!syscon->base)
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return -EADDRNOTAVAIL;
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ret = of_address_to_resource(np, 0, &res);
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if (ret)
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return ret;
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syscon_regmap_config.max_register = res.end - res.start - 3;
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syscon->regmap = devm_regmap_init_mmio(dev, syscon->base,
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&syscon_regmap_config);
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if (IS_ERR(syscon->regmap)) {
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dev_err(dev, "regmap init failed\n");
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return PTR_ERR(syscon->regmap);
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}
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syscon->dev = dev;
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platform_set_drvdata(pdev, syscon);
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dev_info(dev, "syscon regmap start 0x%x end 0x%x registered\n",
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res.start, res.end);
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return 0;
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}
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static int syscon_remove(struct platform_device *pdev)
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{
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struct syscon *syscon;
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syscon = platform_get_drvdata(pdev);
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iounmap(syscon->base);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static struct platform_driver syscon_driver = {
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.driver = {
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.name = "syscon",
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.owner = THIS_MODULE,
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.of_match_table = of_syscon_match,
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},
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.probe = syscon_probe,
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.remove = syscon_remove,
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};
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static int __init syscon_init(void)
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{
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return platform_driver_register(&syscon_driver);
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}
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postcore_initcall(syscon_init);
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static void __exit syscon_exit(void)
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{
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platform_driver_unregister(&syscon_driver);
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}
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module_exit(syscon_exit);
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MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>");
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MODULE_DESCRIPTION("System Control driver");
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MODULE_LICENSE("GPL v2");
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