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// SPDX-License-Identifier: GPL-2.0-only
#include <common.h>
#include <errno.h>
#include <driver.h>
#include <mach/linux.h>
#include <of.h>
#include <watchdog.h>
#include <linux/nvmem-consumer.h>
#include <asm/reset_source.h>
struct sandbox_watchdog {
struct watchdog wdd;
bool cant_disable :1;
struct nvmem_cell *reset_source_cell;
};
static inline struct sandbox_watchdog *to_sandbox_watchdog(struct watchdog *wdd)
{
return container_of(wdd, struct sandbox_watchdog, wdd);
}
static int sandbox_watchdog_set_timeout(struct watchdog *wdd, unsigned int timeout)
{
struct sandbox_watchdog *wd = to_sandbox_watchdog(wdd);
if (!timeout && wd->cant_disable)
return -ENOSYS;
if (timeout > wdd->timeout_max)
return -EINVAL;
sandbox_save_reset_source(wd->reset_source_cell, RESET_WDG);
linux_watchdog_set_timeout(timeout);
return 0;
}
static int sandbox_watchdog_probe(struct device *dev)
{
struct device_node *np = dev->of_node;
struct sandbox_watchdog *wd;
struct watchdog *wdd;
wd = xzalloc(sizeof(*wd));
wdd = &wd->wdd;
wdd->hwdev = dev;
wdd->set_timeout = sandbox_watchdog_set_timeout;
wdd->timeout_max = 1000;
wd->reset_source_cell = of_nvmem_cell_get(np, "reset-source");
if (IS_ERR(wd->reset_source_cell)) {
if (PTR_ERR(wd->reset_source_cell) != -EPROBE_DEFER)
dev_warn(dev, "No reset source info available: %pe\n",
wd->reset_source_cell);
wd->reset_source_cell = NULL;
}
wd->cant_disable = of_property_read_bool(np, "barebox,cant-disable");
return watchdog_register(wdd);
}
static __maybe_unused struct of_device_id sandbox_watchdog_dt_ids[] = {
{ .compatible = "barebox,sandbox-watchdog" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sandbox_watchdog_dt_ids);
static struct driver sandbox_watchdog_drv = {
.name = "sandbox-watchdog",
.of_compatible = sandbox_watchdog_dt_ids,
.probe = sandbox_watchdog_probe,
};
device_platform_driver(sandbox_watchdog_drv);
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