mfd: Add syscon driver based on regmap
Add regmap based syscon driver. This is usually used for access misc bits in registers which does not belong to a specific module, for example, IMX IOMUXC GPR and ANATOP. With this driver, client can use generic regmap API to access registers which are registered into syscon. Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>hifive-unleashed-5.1
Dong Aisheng
Samuel Ortiz
parent
a435ae1d51
commit
87d687301f
|
|
@ -0,0 +1,20 @@
|
|||
* System Controller Registers R/W driver
|
||||
|
||||
System controller node represents a register region containing a set
|
||||
of miscellaneous registers. The registers are not cohesive enough to
|
||||
represent as any specific type of device. The typical use-case is for
|
||||
some other node's driver, or platform-specific code, to acquire a
|
||||
reference to the syscon node (e.g. by phandle, node path, or search
|
||||
using a specific compatible value), interrogate the node (or associated
|
||||
OS driver) to determine the location of the registers, and access the
|
||||
registers directly.
|
||||
|
||||
Required properties:
|
||||
- compatible: Should contain "syscon".
|
||||
- reg: the register region can be accessed from syscon
|
||||
|
||||
Examples:
|
||||
gpr: iomuxc-gpr@020e0000 {
|
||||
compatible = "fsl,imx6q-iomuxc-gpr", "syscon";
|
||||
reg = <0x020e0000 0x38>;
|
||||
};
|
||||
|
|
@ -1004,6 +1004,14 @@ config MFD_ANATOP
|
|||
MFD controller. This controller embeds regulator and
|
||||
thermal devices for Freescale i.MX platforms.
|
||||
|
||||
config MFD_SYSCON
|
||||
bool "System Controller Register R/W Based on Regmap"
|
||||
depends on OF
|
||||
select REGMAP_MMIO
|
||||
help
|
||||
Select this option to enable accessing system control registers
|
||||
via regmap.
|
||||
|
||||
config MFD_PALMAS
|
||||
bool "Support for the TI Palmas series chips"
|
||||
select MFD_CORE
|
||||
|
|
|
|||
|
|
@ -132,4 +132,5 @@ obj-$(CONFIG_MFD_PALMAS) += palmas.o
|
|||
obj-$(CONFIG_MFD_RC5T583) += rc5t583.o rc5t583-irq.o
|
||||
obj-$(CONFIG_MFD_SEC_CORE) += sec-core.o sec-irq.o
|
||||
obj-$(CONFIG_MFD_ANATOP) += anatop-mfd.o
|
||||
obj-$(CONFIG_MFD_SYSCON) += syscon.o
|
||||
obj-$(CONFIG_MFD_LM3533) += lm3533-core.o lm3533-ctrlbank.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,176 @@
|
|||
/*
|
||||
* System Control Driver
|
||||
*
|
||||
* Copyright (C) 2012 Freescale Semiconductor, Inc.
|
||||
* Copyright (C) 2012 Linaro Ltd.
|
||||
*
|
||||
* Author: Dong Aisheng <dong.aisheng@linaro.org>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*/
|
||||
|
||||
#include <linux/err.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/of_address.h>
|
||||
#include <linux/of_platform.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/regmap.h>
|
||||
|
||||
static struct platform_driver syscon_driver;
|
||||
|
||||
struct syscon {
|
||||
struct device *dev;
|
||||
void __iomem *base;
|
||||
struct regmap *regmap;
|
||||
};
|
||||
|
||||
static int syscon_match(struct device *dev, void *data)
|
||||
{
|
||||
struct syscon *syscon = dev_get_drvdata(dev);
|
||||
struct device_node *dn = data;
|
||||
|
||||
return (syscon->dev->of_node == dn) ? 1 : 0;
|
||||
}
|
||||
|
||||
struct regmap *syscon_node_to_regmap(struct device_node *np)
|
||||
{
|
||||
struct syscon *syscon;
|
||||
struct device *dev;
|
||||
|
||||
dev = driver_find_device(&syscon_driver.driver, NULL, np,
|
||||
syscon_match);
|
||||
if (!dev)
|
||||
return ERR_PTR(-EPROBE_DEFER);
|
||||
|
||||
syscon = dev_get_drvdata(dev);
|
||||
|
||||
return syscon->regmap;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(syscon_node_to_regmap);
|
||||
|
||||
struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
|
||||
{
|
||||
struct device_node *syscon_np;
|
||||
struct regmap *regmap;
|
||||
|
||||
syscon_np = of_find_compatible_node(NULL, NULL, s);
|
||||
if (!syscon_np)
|
||||
return ERR_PTR(-ENODEV);
|
||||
|
||||
regmap = syscon_node_to_regmap(syscon_np);
|
||||
of_node_put(syscon_np);
|
||||
|
||||
return regmap;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
|
||||
|
||||
struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
|
||||
const char *property)
|
||||
{
|
||||
struct device_node *syscon_np;
|
||||
struct regmap *regmap;
|
||||
|
||||
syscon_np = of_parse_phandle(np, property, 0);
|
||||
if (!syscon_np)
|
||||
return ERR_PTR(-ENODEV);
|
||||
|
||||
regmap = syscon_node_to_regmap(syscon_np);
|
||||
of_node_put(syscon_np);
|
||||
|
||||
return regmap;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
|
||||
|
||||
static const struct of_device_id of_syscon_match[] = {
|
||||
{ .compatible = "syscon", },
|
||||
{ },
|
||||
};
|
||||
|
||||
static struct regmap_config syscon_regmap_config = {
|
||||
.reg_bits = 32,
|
||||
.val_bits = 32,
|
||||
.reg_stride = 4,
|
||||
};
|
||||
|
||||
static int __devinit syscon_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device *dev = &pdev->dev;
|
||||
struct device_node *np = dev->of_node;
|
||||
struct syscon *syscon;
|
||||
struct resource res;
|
||||
int ret;
|
||||
|
||||
if (!np)
|
||||
return -ENOENT;
|
||||
|
||||
syscon = devm_kzalloc(dev, sizeof(struct syscon),
|
||||
GFP_KERNEL);
|
||||
if (!syscon)
|
||||
return -ENOMEM;
|
||||
|
||||
syscon->base = of_iomap(np, 0);
|
||||
if (!syscon->base)
|
||||
return -EADDRNOTAVAIL;
|
||||
|
||||
ret = of_address_to_resource(np, 0, &res);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
syscon_regmap_config.max_register = res.end - res.start - 3;
|
||||
syscon->regmap = devm_regmap_init_mmio(dev, syscon->base,
|
||||
&syscon_regmap_config);
|
||||
if (IS_ERR(syscon->regmap)) {
|
||||
dev_err(dev, "regmap init failed\n");
|
||||
return PTR_ERR(syscon->regmap);
|
||||
}
|
||||
|
||||
syscon->dev = dev;
|
||||
platform_set_drvdata(pdev, syscon);
|
||||
|
||||
dev_info(dev, "syscon regmap start 0x%x end 0x%x registered\n",
|
||||
res.start, res.end);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devexit syscon_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct syscon *syscon;
|
||||
|
||||
syscon = platform_get_drvdata(pdev);
|
||||
iounmap(syscon->base);
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver syscon_driver = {
|
||||
.driver = {
|
||||
.name = "syscon",
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = of_syscon_match,
|
||||
},
|
||||
.probe = syscon_probe,
|
||||
.remove = __devexit_p(syscon_remove),
|
||||
};
|
||||
|
||||
static int __init syscon_init(void)
|
||||
{
|
||||
return platform_driver_register(&syscon_driver);
|
||||
}
|
||||
postcore_initcall(syscon_init);
|
||||
|
||||
static void __exit syscon_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&syscon_driver);
|
||||
}
|
||||
module_exit(syscon_exit);
|
||||
|
||||
MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>");
|
||||
MODULE_DESCRIPTION("System Control driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,23 @@
|
|||
/*
|
||||
* System Control Driver
|
||||
*
|
||||
* Copyright (C) 2012 Freescale Semiconductor, Inc.
|
||||
* Copyright (C) 2012 Linaro Ltd.
|
||||
*
|
||||
* Author: Dong Aisheng <dong.aisheng@linaro.org>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*/
|
||||
|
||||
#ifndef __LINUX_MFD_SYSCON_H__
|
||||
#define __LINUX_MFD_SYSCON_H__
|
||||
|
||||
extern struct regmap *syscon_node_to_regmap(struct device_node *np);
|
||||
extern struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
|
||||
extern struct regmap *syscon_regmap_lookup_by_phandle(
|
||||
struct device_node *np,
|
||||
const char *property);
|
||||
#endif /* __LINUX_MFD_SYSCON_H__ */
|
||||
Loading…
Reference in New Issue