204 lines
4.0 KiB
C
204 lines
4.0 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 <of_address.h>
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#include <linux/err.h>
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#include <mfd/syscon.h>
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static LIST_HEAD(syscon_list);
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struct syscon {
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struct device_node *np;
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void __iomem *base;
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struct list_head list;
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struct regmap *regmap;
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};
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static int syscon_reg_write(void *context, unsigned int reg,
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unsigned int val)
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{
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struct syscon *syscon = context;
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writel(val, syscon->base + reg);
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return 0;
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}
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static int syscon_reg_read(void *context, unsigned int reg,
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unsigned int *val)
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{
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struct syscon *syscon = context;
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*val = readl(syscon->base + reg);
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return 0;
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}
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static const struct regmap_bus syscon_regmap_bus = {
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.reg_write = syscon_reg_write,
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.reg_read = syscon_reg_read,
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};
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static const 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 struct syscon *of_syscon_register(struct device_node *np)
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{
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int ret;
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struct syscon *syscon;
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struct resource res;
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if (!of_device_is_compatible(np, "syscon"))
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return ERR_PTR(-EINVAL);
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syscon = xzalloc(sizeof(*syscon));
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if (of_address_to_resource(np, 0, &res)) {
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ret = -ENOMEM;
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goto err_map;
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}
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syscon->base = IOMEM(res.start);
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syscon->np = np;
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list_add_tail(&syscon->list, &syscon_list);
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syscon->regmap = regmap_init(NULL,
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&syscon_regmap_bus,
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syscon,
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&syscon_regmap_config);
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return syscon;
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err_map:
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kfree(syscon);
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return ERR_PTR(ret);
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}
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static struct syscon *node_to_syscon(struct device_node *np)
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{
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struct syscon *entry, *syscon = NULL;
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list_for_each_entry(entry, &syscon_list, list)
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if (entry->np == np) {
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syscon = entry;
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break;
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}
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if (!syscon)
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syscon = of_syscon_register(np);
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if (IS_ERR(syscon))
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return ERR_CAST(syscon);
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return syscon;
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}
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static void __iomem *syscon_node_to_base(struct device_node *np)
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{
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struct syscon *syscon = node_to_syscon(np);
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if (IS_ERR(syscon))
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return ERR_CAST(syscon);
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return syscon->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 *syscon_np;
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if (property)
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syscon_np = of_parse_phandle(np, property, 0);
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else
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syscon_np = np;
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if (!syscon_np)
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return ERR_PTR(-ENODEV);
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return syscon_node_to_base(syscon_np);
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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 = node_to_syscon(np);
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if (IS_ERR(syscon))
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return ERR_CAST(syscon);
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return syscon->regmap;
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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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res = dev_get_resource(dev, IORESOURCE_MEM, 0);
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if (IS_ERR(res)) {
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free(syscon);
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return PTR_ERR(res);
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}
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syscon->base = 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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