113 lines
2.2 KiB
C
113 lines
2.2 KiB
C
/* System Control Driver
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*
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* Based on linux driver by:
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* Copyright (C) 2012 Freescale Semiconductor, Inc.
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* Copyright (C) 2012 Linaro Ltd.
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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 <io.h>
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#include <init.h>
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#include <common.h>
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#include <driver.h>
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#include <malloc.h>
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#include <xfuncs.h>
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#include <linux/err.h>
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#include <mfd/syscon.h>
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struct syscon {
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void __iomem *base;
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};
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void __iomem *syscon_base_lookup_by_pdevname(const char *s)
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{
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struct syscon *syscon;
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struct device_d *dev;
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for_each_device(dev) {
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if (!strcmp(dev_name(dev), s)) {
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syscon = dev->priv;
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return syscon->base;
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}
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}
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return ERR_PTR(-ENODEV);
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}
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void __iomem *syscon_base_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 *node;
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struct syscon *syscon;
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struct device_d *dev;
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node = of_parse_phandle(np, property, 0);
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if (!node)
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return ERR_PTR(-ENODEV);
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dev = of_find_device_by_node(node);
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if (!dev)
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return ERR_PTR(-ENODEV);
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syscon = dev->priv;
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return syscon->base;
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}
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static int syscon_probe(struct device_d *dev)
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{
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struct syscon *syscon;
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struct resource *res;
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syscon = xzalloc(sizeof(struct syscon));
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if (!syscon)
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return -ENOMEM;
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res = dev_get_resource(dev, IORESOURCE_MEM, 0);
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if (!res) {
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free(syscon);
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return -ENOENT;
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}
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res = request_iomem_region(dev_name(dev), res->start, res->end);
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if (!res) {
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free(syscon);
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return -EBUSY;
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}
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syscon->base = (void __iomem *)res->start;
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dev->priv = syscon;
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dev_dbg(dev, "map 0x%x-0x%x registered\n", res->start, res->end);
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return 0;
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}
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static struct platform_device_id syscon_ids[] = {
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{ "syscon", },
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{ }
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};
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static struct driver_d syscon_driver = {
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.name = "syscon",
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.probe = syscon_probe,
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.id_table = syscon_ids,
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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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core_initcall(syscon_init);
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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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