Add system controller register driver (SYSCON)
This patch adds support for system controller register driver (SYSCON). Code taken from Linux Kernel and adapted for using in barebox. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@ -24,6 +24,11 @@ config MFD_STMPE
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depends on I2C
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bool "STMPE-i2c driver"
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config MFD_SYSCON
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bool "System Controller Register"
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help
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Select this option to enable accessing system control registers
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config MFD_TWLCORE
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bool
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@ -4,6 +4,7 @@ obj-$(CONFIG_MFD_MC34704) += mc34704.o
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obj-$(CONFIG_MFD_MC34708) += mc34708.o
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obj-$(CONFIG_MFD_MC9SDZ60) += mc9sdz60.o
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obj-$(CONFIG_MFD_STMPE) += stmpe-i2c.o
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obj-$(CONFIG_MFD_SYSCON) += syscon.o
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obj-$(CONFIG_MFD_TWLCORE) += twl-core.o
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obj-$(CONFIG_MFD_TWL4030) += twl4030.o
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obj-$(CONFIG_MFD_TWL6030) += twl6030.o
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@ -0,0 +1,92 @@
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/* 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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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, 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_info(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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@ -0,0 +1,26 @@
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/* 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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#ifndef __MFD_SYSCON_H__
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#define __MFD_SYSCON_H__
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#ifdef CONFIG_MFD_SYSCON
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void __iomem *syscon_base_lookup_by_pdevname(const char *);
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#else
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static inline void __iomem *syscon_base_lookup_by_pdevname(const char *)
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{
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return NULL;
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}
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#endif
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#endif
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