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- // 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,
- };
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