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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2018 Kalray Inc.
*/
#include <common.h>
#include <init.h>
#include <io.h>
#include <of.h>
#include <watchdog.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <asm/sfr.h>
struct kvx_wdt {
uint64_t clk_rate;
struct watchdog wdd;
};
static void kvx_watchdog_disable(void)
{
kvx_sfr_set_field(TCR, WUI, 0);
kvx_sfr_set_field(TCR, WCE, 0);
}
static int kvx_wdt_set_timeout(struct watchdog *wdd, unsigned int timeout)
{
struct kvx_wdt *wdt = container_of(wdd, struct kvx_wdt, wdd);
uint64_t cycle_timeout = wdt->clk_rate * timeout;
/* Disable watchdog */
if (timeout == 0) {
kvx_watchdog_disable();
return 0;
}
kvx_sfr_set(WDV, cycle_timeout);
kvx_sfr_set(WDR, 0);
/* Start watchdog counting */
kvx_sfr_set_field(TCR, WUI, 1);
kvx_sfr_set_field(TCR, WCE, 1);
return 0;
}
static int count;
static int kvx_wdt_drv_probe(struct device *dev)
{
struct watchdog *wdd;
struct clk *clk;
struct kvx_wdt *kvx_wdt;
if (count != 0) {
dev_warn(dev, "Tried to register core watchdog twice\n");
return -EINVAL;
}
count++;
kvx_wdt = xzalloc(sizeof(*kvx_wdt));
clk = clk_get(dev, NULL);
if (IS_ERR(clk))
return PTR_ERR(clk);
kvx_wdt->clk_rate = clk_get_rate(clk);
clk_put(clk);
wdd = &kvx_wdt->wdd;
wdd->name = "kvx_wdt";
wdd->hwdev = dev;
wdd->set_timeout = kvx_wdt_set_timeout;
/* Be sure that interrupt are disabled */
kvx_sfr_set_field(TCR, WIE, 0);
return watchdog_register(wdd);
}
static struct of_device_id kvx_wdt_of_match[] = {
{ .compatible = "kalray,kvx-core-watchdog", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, kvx_wdt_of_match);
static struct driver kvx_wdt_driver = {
.name = "kvx-wdt",
.probe = kvx_wdt_drv_probe,
.of_compatible = DRV_OF_COMPAT(kvx_wdt_of_match),
};
device_platform_driver(kvx_wdt_driver);
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