mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-16 23:18:51 +09:00
![Andy Shevchenko](/assets/img/avatar_default.png)
Convert legacy driver to use watchdog class. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Stefan Roese <sr@denx.de>
93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2017 Intel Corporation
|
|
*/
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <wdt.h>
|
|
#include <div64.h>
|
|
#include <asm/scu.h>
|
|
|
|
/* Hardware timeout in seconds */
|
|
#define WDT_PRETIMEOUT 15
|
|
#define WDT_TIMEOUT_MIN (1 + WDT_PRETIMEOUT)
|
|
#define WDT_TIMEOUT_MAX 170
|
|
|
|
/*
|
|
* Note, firmware chooses 90 seconds as a default timeout for watchdog on
|
|
* Intel Tangier SoC. It means that without handling it in the running code
|
|
* the reboot will happen.
|
|
*/
|
|
|
|
enum {
|
|
SCU_WATCHDOG_START = 0,
|
|
SCU_WATCHDOG_STOP = 1,
|
|
SCU_WATCHDOG_KEEPALIVE = 2,
|
|
SCU_WATCHDOG_SET_ACTION_ON_TIMEOUT = 3,
|
|
};
|
|
|
|
static int tangier_wdt_reset(struct udevice *dev)
|
|
{
|
|
scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_KEEPALIVE);
|
|
return 0;
|
|
}
|
|
|
|
static int tangier_wdt_stop(struct udevice *dev)
|
|
{
|
|
return scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_STOP);
|
|
}
|
|
|
|
static int tangier_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
|
|
{
|
|
u32 timeout_sec;
|
|
int in_size;
|
|
struct ipc_wd_start {
|
|
u32 pretimeout;
|
|
u32 timeout;
|
|
} ipc_wd_start;
|
|
|
|
/* Calculate timeout in seconds and restrict to min and max value */
|
|
do_div(timeout_ms, 1000);
|
|
timeout_sec = clamp_t(u32, timeout_ms, WDT_TIMEOUT_MIN, WDT_TIMEOUT_MAX);
|
|
|
|
/* Update values in the IPC request */
|
|
ipc_wd_start.pretimeout = timeout_sec - WDT_PRETIMEOUT;
|
|
ipc_wd_start.timeout = timeout_sec;
|
|
|
|
/*
|
|
* SCU expects the input size for watchdog IPC
|
|
* to be based on 4 bytes
|
|
*/
|
|
in_size = DIV_ROUND_UP(sizeof(ipc_wd_start), 4);
|
|
|
|
scu_ipc_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_START,
|
|
(u32 *)&ipc_wd_start, in_size, NULL, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct wdt_ops tangier_wdt_ops = {
|
|
.reset = tangier_wdt_reset,
|
|
.start = tangier_wdt_start,
|
|
.stop = tangier_wdt_stop,
|
|
};
|
|
|
|
static const struct udevice_id tangier_wdt_ids[] = {
|
|
{ .compatible = "intel,tangier-wdt" },
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
static int tangier_wdt_probe(struct udevice *dev)
|
|
{
|
|
debug("%s: Probing wdt%u\n", __func__, dev->seq);
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_DRIVER(wdt_tangier) = {
|
|
.name = "wdt_tangier",
|
|
.id = UCLASS_WDT,
|
|
.of_match = tangier_wdt_ids,
|
|
.ops = &tangier_wdt_ops,
|
|
.probe = tangier_wdt_probe,
|
|
};
|