wdt.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Watchdog commands
*
* Copyright (c) 2019 Michael Walle <michael@walle.cc>
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <wdt.h>
static struct udevice *currdev;
static int do_wdt_list(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
struct udevice *dev;
struct uclass *uc;
int ret;
ret = uclass_get(UCLASS_WDT, &uc);
if (ret)
return CMD_RET_FAILURE;
uclass_foreach_dev(dev, uc)
printf("%s (%s)\n", dev->name, dev->driver->name);
return CMD_RET_SUCCESS;
}
static int do_wdt_dev(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
int ret;
if (argc > 1) {
ret = uclass_get_device_by_name(UCLASS_WDT, argv[1], &currdev);
if (ret) {
printf("Can't get the watchdog timer: %s\n", argv[1]);
return CMD_RET_FAILURE;
}
} else {
if (!currdev) {
printf("No watchdog timer device set!\n");
return CMD_RET_FAILURE;
}
printf("dev: %s\n", currdev->name);
}
return CMD_RET_SUCCESS;
}
static int check_currdev(void)
{
if (!currdev) {
printf("No device set, use 'wdt dev' first\n");
return CMD_RET_FAILURE;
}
return 0;
}
static int do_wdt_start(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
int ret;
u64 timeout;
ulong flags = 0;
if (argc < 2)
return CMD_RET_USAGE;
ret = check_currdev();
if (ret)
return ret;
timeout = simple_strtoull(argv[1], NULL, 0);
if (argc > 2)
flags = simple_strtoul(argv[2], NULL, 0);
ret = wdt_start(currdev, timeout, flags);
if (ret == -ENOSYS) {
printf("Starting watchdog timer not supported.\n");
return CMD_RET_FAILURE;
} else if (ret) {
printf("Starting watchdog timer failed (%d)\n", ret);
return CMD_RET_FAILURE;
}
return CMD_RET_SUCCESS;
}
static int do_wdt_stop(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
int ret;
ret = check_currdev();
if (ret)
return ret;
ret = wdt_stop(currdev);
if (ret == -ENOSYS) {
printf("Stopping watchdog timer not supported.\n");
return CMD_RET_FAILURE;
} else if (ret) {
printf("Stopping watchdog timer failed (%d)\n", ret);
return CMD_RET_FAILURE;
}
return CMD_RET_SUCCESS;
}
static int do_wdt_reset(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
int ret;
ret = check_currdev();
if (ret)
return ret;
ret = wdt_reset(currdev);
if (ret == -ENOSYS) {
printf("Resetting watchdog timer not supported.\n");
return CMD_RET_FAILURE;
} else if (ret) {
printf("Resetting watchdog timer failed (%d)\n", ret);
return CMD_RET_FAILURE;
}
return CMD_RET_SUCCESS;
}
static int do_wdt_expire(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
int ret;
ulong flags = 0;
ret = check_currdev();
if (ret)
return ret;
if (argc > 1)
flags = simple_strtoul(argv[1], NULL, 0);
ret = wdt_expire_now(currdev, flags);
if (ret == -ENOSYS) {
printf("Expiring watchdog timer not supported.\n");
return CMD_RET_FAILURE;
} else if (ret) {
printf("Expiring watchdog timer failed (%d)\n", ret);
return CMD_RET_FAILURE;
}
return CMD_RET_SUCCESS;
}
static char wdt_help_text[] =
"list - list watchdog devices\n"
"wdt dev [<name>] - get/set current watchdog device\n"
"wdt start <timeout ms> [flags] - start watchdog timer\n"
"wdt stop - stop watchdog timer\n"
"wdt reset - reset watchdog timer\n"
"wdt expire [flags] - expire watchdog timer immediately\n";
U_BOOT_CMD_WITH_SUBCMDS(wdt, "Watchdog sub-system", wdt_help_text,
U_BOOT_SUBCMD_MKENT(list, 1, 1, do_wdt_list),
U_BOOT_SUBCMD_MKENT(dev, 2, 1, do_wdt_dev),
U_BOOT_SUBCMD_MKENT(start, 3, 1, do_wdt_start),
U_BOOT_SUBCMD_MKENT(stop, 1, 1, do_wdt_stop),
U_BOOT_SUBCMD_MKENT(reset, 1, 1, do_wdt_reset),
U_BOOT_SUBCMD_MKENT(expire, 2, 1, do_wdt_expire));