// SPDX-License-Identifier: GPL-2.0+
|
/*
|
* Copyright (C) 2015 Google, Inc
|
* Written by Simon Glass <sjg@chromium.org>
|
*/
|
|
#include <common.h>
|
#include <syscon.h>
|
#include <dm.h>
|
#include <errno.h>
|
#include <regmap.h>
|
#include <dm/device-internal.h>
|
#include <dm/lists.h>
|
#include <dm/root.h>
|
#include <linux/err.h>
|
|
struct regmap *syscon_get_regmap(struct udevice *dev)
|
{
|
struct syscon_uc_info *priv;
|
|
if (device_get_uclass_id(dev) != UCLASS_SYSCON)
|
return ERR_PTR(-ENOEXEC);
|
priv = dev_get_uclass_priv(dev);
|
return priv->regmap;
|
}
|
|
static int syscon_pre_probe(struct udevice *dev)
|
{
|
struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
|
|
/*
|
* With OF_PLATDATA we really have no way of knowing the format of
|
* the device-specific platform data. So we assume that it starts with
|
* a 'reg' member, and this holds a single address and size. Drivers
|
* using OF_PLATDATA will need to ensure that this is true.
|
*/
|
#if CONFIG_IS_ENABLED(OF_PLATDATA)
|
struct syscon_base_platdata *plat = dev_get_platdata(dev);
|
|
return regmap_init_mem_platdata(dev, plat->reg, ARRAY_SIZE(plat->reg),
|
&priv->regmap);
|
#else
|
return regmap_init_mem(dev, &priv->regmap);
|
#endif
|
}
|
|
int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp)
|
{
|
struct udevice *dev;
|
struct uclass *uc;
|
int ret;
|
|
*devp = NULL;
|
ret = uclass_get(UCLASS_SYSCON, &uc);
|
if (ret)
|
return ret;
|
uclass_foreach_dev(dev, uc) {
|
if (dev->driver_data == driver_data) {
|
*devp = dev;
|
return device_probe(dev);
|
}
|
}
|
|
return -ENODEV;
|
}
|
|
struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
|
{
|
struct syscon_uc_info *priv;
|
struct udevice *dev;
|
int ret;
|
|
ret = syscon_get_by_driver_data(driver_data, &dev);
|
if (ret)
|
return ERR_PTR(ret);
|
priv = dev_get_uclass_priv(dev);
|
|
return priv->regmap;
|
}
|
|
void *syscon_get_first_range(ulong driver_data)
|
{
|
struct regmap *map;
|
|
map = syscon_get_regmap_by_driver_data(driver_data);
|
if (IS_ERR(map))
|
return map;
|
return regmap_get_range(map, 0);
|
}
|
|
UCLASS_DRIVER(syscon) = {
|
.id = UCLASS_SYSCON,
|
.name = "syscon",
|
.per_device_auto_alloc_size = sizeof(struct syscon_uc_info),
|
.pre_probe = syscon_pre_probe,
|
};
|
|
static const struct udevice_id generic_syscon_ids[] = {
|
{ .compatible = "syscon" },
|
{ }
|
};
|
|
U_BOOT_DRIVER(generic_syscon) = {
|
.name = "syscon",
|
.id = UCLASS_SYSCON,
|
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
|
.bind = dm_scan_fdt_dev,
|
#endif
|
.of_match = generic_syscon_ids,
|
};
|
