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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Feb 2024 21:03:57.7427 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e03ee489-eb75-4e68-e760-08dc2f32cae7 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017091.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV8PR12MB9334 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This change adds support for WDIOC_GETTIMELEFT so userspace programs can get the number of seconds before system reset by the watchdog timer via ioctl. Signed-off-by: Pohsun Su --- drivers/clocksource/timer-tegra186.c | 44 +++++++++++++++++++++++++++- 1 file changed, 43 insertions(+), 1 deletion(-) diff --git a/drivers/clocksource/timer-tegra186.c b/drivers/clocksource/tim= er-tegra186.c index 304537dadf2c..8f516366da86 100644 --- a/drivers/clocksource/timer-tegra186.c +++ b/drivers/clocksource/timer-tegra186.c @@ -1,8 +1,9 @@ // SPDX-License-Identifier: GPL-2.0-only /* - * Copyright (c) 2019-2020 NVIDIA Corporation. All rights reserved. + * Copyright (c) 2019-2024 NVIDIA Corporation. All rights reserved. */ =20 +#include #include #include #include @@ -29,6 +30,7 @@ =20 #define TMRSR 0x004 #define TMRSR_INTR_CLR BIT(30) +#define TMRSR_PCV GENMASK(28, 0) =20 #define TMRCSSR 0x008 #define TMRCSSR_SRC_USEC (0 << 0) @@ -45,6 +47,9 @@ #define WDTCR_TIMER_SOURCE_MASK 0xf #define WDTCR_TIMER_SOURCE(x) ((x) & 0xf) =20 +#define WDTSR 0x004 +#define WDTSR_CURRENT_EXPIRATION_COUNT GENMASK(14, 12) + #define WDTCMDR 0x008 #define WDTCMDR_DISABLE_COUNTER BIT(1) #define WDTCMDR_START_COUNTER BIT(0) @@ -234,12 +239,49 @@ static int tegra186_wdt_set_timeout(struct watchdog_d= evice *wdd, return 0; } =20 +static unsigned int tegra186_wdt_get_timeleft(struct watchdog_device *wdd) +{ + struct tegra186_wdt *wdt =3D to_tegra186_wdt(wdd); + u32 timeleft; + u32 expiration; + + if (!watchdog_active(&wdt->base)) { + /* return zero if the watchdog timer is not activated. */ + return 0; + } + + /* + * System power-on reset occurs on the fifth expiration of the watchdog t= imer and so + * when the watchdog timer is configured, the actual value programmed int= o the counter + * is 1/5 of the timeout value. Once the counter reaches 0, expiration co= unt will be + * increased by 1 and the down counter restarts. + * Hence to get the time left before system reset we must combine 2 parts: + * 1. value of the current down counter + * 2. (number of counter expirations remaining) * (timeout/5) + */ + + /* Get the current number of counter expirations. Should be a value betwe= en 0 and 4. */ + expiration =3D FIELD_GET(WDTSR_CURRENT_EXPIRATION_COUNT, readl_relaxed(wd= t->regs + WDTSR)); + + /* Convert the current counter value to seconds, rounding up to the neare= st second. */ + timeleft =3D FIELD_GET(TMRSR_PCV, readl_relaxed(wdt->tmr->regs + TMRSR)); + timeleft =3D (timeleft + USEC_PER_SEC / 2) / USEC_PER_SEC; + + /* + * Calculate the time remaining by adding the time for the counter value + * to the time of the counter expirations that remain. + */ + timeleft +=3D wdt->base.timeout * (4 - expiration) / 5; + return timeleft; +} + static const struct watchdog_ops tegra186_wdt_ops =3D { .owner =3D THIS_MODULE, .start =3D tegra186_wdt_start, .stop =3D tegra186_wdt_stop, .ping =3D tegra186_wdt_ping, .set_timeout =3D tegra186_wdt_set_timeout, + .get_timeleft =3D tegra186_wdt_get_timeleft, }; =20 static struct tegra186_wdt *tegra186_wdt_create(struct tegra186_timer *teg= ra, --=20 2.17.1