Contributors: 24
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Dong Aisheng |
549 |
37.86% |
1 |
3.33% |
| Pankaj Dubey |
264 |
18.21% |
2 |
6.67% |
| Fabrice Gasnier |
97 |
6.69% |
1 |
3.33% |
| Baolin Wang |
84 |
5.79% |
1 |
3.33% |
| Orson Zhai |
79 |
5.45% |
1 |
3.33% |
| Enric Balletbò i Serra |
48 |
3.31% |
1 |
3.33% |
| Jeremy Kerr |
48 |
3.31% |
1 |
3.33% |
| Jason A. Donenfeld |
46 |
3.17% |
1 |
3.33% |
| Alexander Shiyan |
43 |
2.97% |
4 |
13.33% |
| Damien Riegel |
38 |
2.62% |
1 |
3.33% |
| Paul Cercueil |
35 |
2.41% |
1 |
3.33% |
| Philipp Zabel |
32 |
2.21% |
2 |
6.67% |
| Pawel Moll |
24 |
1.66% |
1 |
3.33% |
| Kunwu Chan |
17 |
1.17% |
1 |
3.33% |
| Suman Anna |
15 |
1.03% |
1 |
3.33% |
| David Lechner |
8 |
0.55% |
1 |
3.33% |
| Andy Shevchenko |
6 |
0.41% |
2 |
6.67% |
| Peter Griffin |
4 |
0.28% |
1 |
3.33% |
| Fabio Estevam |
3 |
0.21% |
1 |
3.33% |
| Hector Martin |
3 |
0.21% |
1 |
3.33% |
| Thomas Gleixner |
2 |
0.14% |
1 |
3.33% |
| Meng Li |
2 |
0.14% |
1 |
3.33% |
| Gustavo A. R. Silva |
2 |
0.14% |
1 |
3.33% |
| Paul Gortmaker |
1 |
0.07% |
1 |
3.33% |
| Total |
1450 |
|
30 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* System Control Driver
*
* Copyright (C) 2012 Freescale Semiconductor, Inc.
* Copyright (C) 2012 Linaro Ltd.
*
* Author: Dong Aisheng <dong.aisheng@linaro.org>
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/hwspinlock.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_data/syscon.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/mfd/syscon.h>
#include <linux/slab.h>
static struct platform_driver syscon_driver;
static DEFINE_SPINLOCK(syscon_list_slock);
static LIST_HEAD(syscon_list);
struct syscon {
struct device_node *np;
struct regmap *regmap;
struct reset_control *reset;
struct list_head list;
};
static const struct regmap_config syscon_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
static struct syscon *of_syscon_register(struct device_node *np, bool check_res)
{
struct clk *clk;
struct syscon *syscon;
struct regmap *regmap;
void __iomem *base;
u32 reg_io_width;
int ret;
struct regmap_config syscon_config = syscon_regmap_config;
struct resource res;
struct reset_control *reset;
syscon = kzalloc(sizeof(*syscon), GFP_KERNEL);
if (!syscon)
return ERR_PTR(-ENOMEM);
if (of_address_to_resource(np, 0, &res)) {
ret = -ENOMEM;
goto err_map;
}
base = of_iomap(np, 0);
if (!base) {
ret = -ENOMEM;
goto err_map;
}
/* Parse the device's DT node for an endianness specification */
if (of_property_read_bool(np, "big-endian"))
syscon_config.val_format_endian = REGMAP_ENDIAN_BIG;
else if (of_property_read_bool(np, "little-endian"))
syscon_config.val_format_endian = REGMAP_ENDIAN_LITTLE;
else if (of_property_read_bool(np, "native-endian"))
syscon_config.val_format_endian = REGMAP_ENDIAN_NATIVE;
/*
* search for reg-io-width property in DT. If it is not provided,
* default to 4 bytes. regmap_init_mmio will return an error if values
* are invalid so there is no need to check them here.
*/
ret = of_property_read_u32(np, "reg-io-width", ®_io_width);
if (ret)
reg_io_width = 4;
ret = of_hwspin_lock_get_id(np, 0);
if (ret > 0 || (IS_ENABLED(CONFIG_HWSPINLOCK) && ret == 0)) {
syscon_config.use_hwlock = true;
syscon_config.hwlock_id = ret;
syscon_config.hwlock_mode = HWLOCK_IRQSTATE;
} else if (ret < 0) {
switch (ret) {
case -ENOENT:
/* Ignore missing hwlock, it's optional. */
break;
default:
pr_err("Failed to retrieve valid hwlock: %d\n", ret);
fallthrough;
case -EPROBE_DEFER:
goto err_regmap;
}
}
syscon_config.name = kasprintf(GFP_KERNEL, "%pOFn@%pa", np, &res.start);
if (!syscon_config.name) {
ret = -ENOMEM;
goto err_regmap;
}
syscon_config.reg_stride = reg_io_width;
syscon_config.val_bits = reg_io_width * 8;
syscon_config.max_register = resource_size(&res) - reg_io_width;
regmap = regmap_init_mmio(NULL, base, &syscon_config);
kfree(syscon_config.name);
if (IS_ERR(regmap)) {
pr_err("regmap init failed\n");
ret = PTR_ERR(regmap);
goto err_regmap;
}
if (check_res) {
clk = of_clk_get(np, 0);
if (IS_ERR(clk)) {
ret = PTR_ERR(clk);
/* clock is optional */
if (ret != -ENOENT)
goto err_clk;
} else {
ret = regmap_mmio_attach_clk(regmap, clk);
if (ret)
goto err_attach_clk;
}
reset = of_reset_control_get_optional_exclusive(np, NULL);
if (IS_ERR(reset)) {
ret = PTR_ERR(reset);
goto err_attach_clk;
}
ret = reset_control_deassert(reset);
if (ret)
goto err_reset;
}
syscon->regmap = regmap;
syscon->np = np;
spin_lock(&syscon_list_slock);
list_add_tail(&syscon->list, &syscon_list);
spin_unlock(&syscon_list_slock);
return syscon;
err_reset:
reset_control_put(reset);
err_attach_clk:
if (!IS_ERR(clk))
clk_put(clk);
err_clk:
regmap_exit(regmap);
err_regmap:
iounmap(base);
err_map:
kfree(syscon);
return ERR_PTR(ret);
}
static struct regmap *device_node_get_regmap(struct device_node *np,
bool check_res)
{
struct syscon *entry, *syscon = NULL;
spin_lock(&syscon_list_slock);
list_for_each_entry(entry, &syscon_list, list)
if (entry->np == np) {
syscon = entry;
break;
}
spin_unlock(&syscon_list_slock);
if (!syscon)
syscon = of_syscon_register(np, check_res);
if (IS_ERR(syscon))
return ERR_CAST(syscon);
return syscon->regmap;
}
struct regmap *device_node_to_regmap(struct device_node *np)
{
return device_node_get_regmap(np, false);
}
EXPORT_SYMBOL_GPL(device_node_to_regmap);
struct regmap *syscon_node_to_regmap(struct device_node *np)
{
if (!of_device_is_compatible(np, "syscon"))
return ERR_PTR(-EINVAL);
return device_node_get_regmap(np, true);
}
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;
if (property)
syscon_np = of_parse_phandle(np, property, 0);
else
syscon_np = np;
if (!syscon_np)
return ERR_PTR(-ENODEV);
regmap = syscon_node_to_regmap(syscon_np);
if (property)
of_node_put(syscon_np);
return regmap;
}
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
struct regmap *syscon_regmap_lookup_by_phandle_args(struct device_node *np,
const char *property,
int arg_count,
unsigned int *out_args)
{
struct device_node *syscon_np;
struct of_phandle_args args;
struct regmap *regmap;
unsigned int index;
int rc;
rc = of_parse_phandle_with_fixed_args(np, property, arg_count,
0, &args);
if (rc)
return ERR_PTR(rc);
syscon_np = args.np;
if (!syscon_np)
return ERR_PTR(-ENODEV);
regmap = syscon_node_to_regmap(syscon_np);
for (index = 0; index < arg_count; index++)
out_args[index] = args.args[index];
of_node_put(syscon_np);
return regmap;
}
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle_args);
/*
* It behaves the same as syscon_regmap_lookup_by_phandle() except where
* there is no regmap phandle. In this case, instead of returning -ENODEV,
* the function returns NULL.
*/
struct regmap *syscon_regmap_lookup_by_phandle_optional(struct device_node *np,
const char *property)
{
struct regmap *regmap;
regmap = syscon_regmap_lookup_by_phandle(np, property);
if (IS_ERR(regmap) && PTR_ERR(regmap) == -ENODEV)
return NULL;
return regmap;
}
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle_optional);
static int syscon_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct syscon_platform_data *pdata = dev_get_platdata(dev);
struct syscon *syscon;
struct regmap_config syscon_config = syscon_regmap_config;
struct resource *res;
void __iomem *base;
syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL);
if (!syscon)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOENT;
base = devm_ioremap(dev, res->start, resource_size(res));
if (!base)
return -ENOMEM;
syscon_config.max_register = resource_size(res) - 4;
if (pdata)
syscon_config.name = pdata->label;
syscon->regmap = devm_regmap_init_mmio(dev, base, &syscon_config);
if (IS_ERR(syscon->regmap)) {
dev_err(dev, "regmap init failed\n");
return PTR_ERR(syscon->regmap);
}
platform_set_drvdata(pdev, syscon);
dev_dbg(dev, "regmap %pR registered\n", res);
return 0;
}
static const struct platform_device_id syscon_ids[] = {
{ "syscon", },
{ }
};
static struct platform_driver syscon_driver = {
.driver = {
.name = "syscon",
},
.probe = syscon_probe,
.id_table = syscon_ids,
};
static int __init syscon_init(void)
{
return platform_driver_register(&syscon_driver);
}
postcore_initcall(syscon_init);