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a1766d55e5
Driver for a PMIC watchdog timer controlled via Siemens SCU firmware extensions. Only useful on some Siemens i.MX8-based platforms as special SCFW is needed which provides the needed SCU API. Signed-off-by: Andrej Valek <andrej.valek@siemens.com> Signed-off-by: Heiko Schocher <hs@denx.de> Reviewed-by: Alexander Sverdlin <alexander.sverdlin@siemens.com> Reviewed-by: Stefan Roese <sr@denx.de>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for a PMIC watchdog timer controlled via Siemens SCU firmware
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* extensions. Only useful on some Siemens i.MX8-based platforms as
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* special NXP SCFW is needed which provides the needed SCU API.
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*
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* Copyright (C) 2024 Siemens AG
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*/
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#include <dm.h>
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#include <wdt.h>
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#include <firmware/imx/sci/sci.h>
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/* watchdog commands */
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#define CMD_START_WDT 0x55
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#define CMD_STOP_WDT 0x45
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#define CMD_PING_WDT 0x35
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static int scu_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
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{
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/* start external watchdog via Timer API */
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return sc_timer_control_siemens_pmic_wdog(-1, CMD_START_WDT);
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}
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static int scu_wdt_stop(struct udevice *dev)
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{
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/* stop external watchdog via Timer API */
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return sc_timer_control_siemens_pmic_wdog(-1, CMD_STOP_WDT);
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}
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static int scu_wdt_reset(struct udevice *dev)
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{
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return sc_timer_control_siemens_pmic_wdog(-1, CMD_PING_WDT);
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}
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static int scu_wdt_probe(struct udevice *dev)
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{
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debug("%s(dev=%p)\n", __func__, dev);
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return 0;
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}
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static const struct wdt_ops scu_wdt_ops = {
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.reset = scu_wdt_reset,
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.start = scu_wdt_start,
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.stop = scu_wdt_stop,
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};
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static const struct udevice_id scu_wdt_ids[] = {
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{ .compatible = "siemens,scu-wdt" },
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{ }
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};
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U_BOOT_DRIVER(scu_wdt) = {
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.name = "scu_wdt",
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.id = UCLASS_WDT,
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.of_match = scu_wdt_ids,
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.probe = scu_wdt_probe,
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.ops = &scu_wdt_ops,
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};
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