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