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linux/drivers/clocksource/timer-tegra186.c

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clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource/drivers/timer-tegra186: Register all accessible watchdog timers Tegra186+ SoCs expose multiple watchdog timers, but the driver only registers WDT(0). Iterate over num_wdts and, for each WDT, check the SCR (firewall) registers in the TKE block to determine whether Linux has read and write access. Register the watchdogs that are accessible. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-4-kkartik@nvidia.com
2026-05-07 21:15:56 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Register all accessible watchdog timers Tegra186+ SoCs expose multiple watchdog timers, but the driver only registers WDT(0). Iterate over num_wdts and, for each WDT, check the SCR (firewall) registers in the TKE block to determine whether Linux has read and write access. Register the watchdogs that are accessible. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-4-kkartik@nvidia.com
2026-05-07 21:15:56 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Fix support for multiple watchdog instances Tegra SoCs support multiple watchdogs; currently only one (WDT0) is used. When multiple watchdogs are registered, tegra186_wdt_enable() overwrites the TKEIE(x) register, discarding any existing watchdog interrupt enable bits. As a result, enabling one watchdog inadvertently disables interrupts for the others. Fix this by preserving the existing TKEIE(x) value and updating it using a read-modify-write sequence. Fixes: 42cee19a9f83 ("clocksource: Add Tegra186 timers support") Cc: stable@vger.kernel.org Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-2-kkartik@nvidia.com
2026-05-07 21:15:54 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/tegra186: Avoid 64-bit division The newly added function causes a build failure on 32-bit targets with older compiler version such as gcc-10: arm-linux-gnueabi-ld: drivers/clocksource/timer-tegra186.o: in function `tegra186_wdt_get_timeleft': timer-tegra186.c:(.text+0x3c2): undefined reference to `__aeabi_uldivmod' The calculation can trivially be changed to avoid the division entirely, as USEC_PER_SEC is a multiple of 5. Change both such calculation for consistency, even though gcc apparently managed to optimize the other one properly already. [dlezcano : Fixed conflict with 20250614175556.922159-2-linux@roeck-us.net ] Fixes: 28c842c8b0f5 ("clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20250620111939.3395525-1-arnd@kernel.org
2025-06-20 13:19:35 +02:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource/drivers/timer-tegra186: Simplify calculating timeleft It is not necessary to use 64-bit operations to calculate the remaining watchdog timeout. Simplify to use 32-bit operations, and add comments explaining why there will be no overflow. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Cc: Pohsun Su <pohsuns@nvidia.com> Cc: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250614175556.922159-2-linux@roeck-us.net
2025-06-14 10:55:56 -07:00
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource/drivers/timer-tegra186: Simplify calculating timeleft It is not necessary to use 64-bit operations to calculate the remaining watchdog timeout. Simplify to use 32-bit operations, and add comments explaining why there will be no overflow. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Cc: Pohsun Su <pohsuns@nvidia.com> Cc: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250614175556.922159-2-linux@roeck-us.net
2025-06-14 10:55:56 -07:00
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource/drivers/timer-tegra186: Simplify calculating timeleft It is not necessary to use 64-bit operations to calculate the remaining watchdog timeout. Simplify to use 32-bit operations, and add comments explaining why there will be no overflow. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Cc: Pohsun Su <pohsuns@nvidia.com> Cc: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250614175556.922159-2-linux@roeck-us.net
2025-06-14 10:55:56 -07:00
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource/drivers/timer-tegra186: Simplify calculating timeleft It is not necessary to use 64-bit operations to calculate the remaining watchdog timeout. Simplify to use 32-bit operations, and add comments explaining why there will be no overflow. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Cc: Pohsun Su <pohsuns@nvidia.com> Cc: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250614175556.922159-2-linux@roeck-us.net
2025-06-14 10:55:56 -07:00
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource/drivers/timer-tegra186: Simplify calculating timeleft It is not necessary to use 64-bit operations to calculate the remaining watchdog timeout. Simplify to use 32-bit operations, and add comments explaining why there will be no overflow. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Cc: Pohsun Su <pohsuns@nvidia.com> Cc: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250614175556.922159-2-linux@roeck-us.net
2025-06-14 10:55:56 -07:00
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource/drivers/timer-tegra186: Simplify calculating timeleft It is not necessary to use 64-bit operations to calculate the remaining watchdog timeout. Simplify to use 32-bit operations, and add comments explaining why there will be no overflow. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Cc: Pohsun Su <pohsuns@nvidia.com> Cc: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250614175556.922159-2-linux@roeck-us.net
2025-06-14 10:55:56 -07:00
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Add WDIOC_GETTIMELEFT support 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 <pohsuns@nvidia.com> Signed-off-by: Robert Lin <robelin@nvidia.com> Link: https://lore.kernel.org/r/20250507044311.3751033-2-robelin@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2025-05-07 12:43:09 +08:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Register all accessible watchdog timers Tegra186+ SoCs expose multiple watchdog timers, but the driver only registers WDT(0). Iterate over num_wdts and, for each WDT, check the SCR (firewall) registers in the TKE block to determine whether Linux has read and write access. Register the watchdogs that are accessible. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-4-kkartik@nvidia.com
2026-05-07 21:15:56 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Don't print superfluous errors The watchdog core will handle error messages already. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com> Link: https://lore.kernel.org/r/20250813190657.3628-2-wsa+renesas@sang-engineering.com
2025-08-13 21:06:58 +02:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/tegra186: Add module owner The conversion to modules requires a correct handling of the module refcount in order to prevent to unload it if it is in use. That is especially true with the clockevents where there is no function to unregister them. The core time framework correctly handles the module refcount with the different clocksource and clockevents if the module owner is set. Add the module owner to make sure the core framework will prevent stupid things happening when the driver will be converted into a module. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Will McVicker <willmcvicker@google.com> Link: https://lore.kernel.org/r/20250602151853.1942521-5-daniel.lezcano@linaro.org
2025-06-02 17:18:48 +02:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/tegra186: Add module owner The conversion to modules requires a correct handling of the module refcount in order to prevent to unload it if it is in use. That is especially true with the clockevents where there is no function to unregister them. The core time framework correctly handles the module refcount with the different clocksource and clockevents if the module owner is set. Add the module owner to make sure the core framework will prevent stupid things happening when the driver will be converted into a module. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Will McVicker <willmcvicker@google.com> Link: https://lore.kernel.org/r/20250602151853.1942521-5-daniel.lezcano@linaro.org
2025-06-02 17:18:48 +02:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/tegra186: Add module owner The conversion to modules requires a correct handling of the module refcount in order to prevent to unload it if it is in use. That is especially true with the clockevents where there is no function to unregister them. The core time framework correctly handles the module refcount with the different clocksource and clockevents if the module owner is set. Add the module owner to make sure the core framework will prevent stupid things happening when the driver will be converted into a module. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Will McVicker <willmcvicker@google.com> Link: https://lore.kernel.org/r/20250602151853.1942521-5-daniel.lezcano@linaro.org
2025-06-02 17:18:48 +02:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Register all accessible watchdog timers Tegra186+ SoCs expose multiple watchdog timers, but the driver only registers WDT(0). Iterate over num_wdts and, for each WDT, check the SCR (firewall) registers in the TKE block to determine whether Linux has read and write access. Register the watchdogs that are accessible. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-4-kkartik@nvidia.com
2026-05-07 21:15:56 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource/drivers/timer-tegra186: Register all accessible watchdog timers Tegra186+ SoCs expose multiple watchdog timers, but the driver only registers WDT(0). Iterate over num_wdts and, for each WDT, check the SCR (firewall) registers in the TKE block to determine whether Linux has read and write access. Register the watchdogs that are accessible. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-4-kkartik@nvidia.com
2026-05-07 21:15:56 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource: Remove redundant dev_err()/dev_err_probe() Since commit 55b48e23f5c4 ("genirq/devres: Add error handling in devm_request_*_irq()"), devm_request_irq() automatically logs detailed error messages on failure. Remove the now-redundant driver-specific dev_err() and dev_err_probe() calls. Signed-off-by: Pan Chuang <panchuang@vivo.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Link: https://patch.msgid.link/20260713130740.293502-1-panchuang@vivo.com
2026-07-13 21:07:39 +08:00
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Convert to platform remove callback returning void The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is (mostly) ignored and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new() which already returns void. Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20230313075430.2730803-5-u.kleine-koenig@pengutronix.de
2023-03-13 08:54:29 +01:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Register all accessible watchdog timers Tegra186+ SoCs expose multiple watchdog timers, but the driver only registers WDT(0). Iterate over num_wdts and, for each WDT, check the SCR (firewall) registers in the TKE block to determine whether Linux has read and write access. Register the watchdogs that are accessible. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-4-kkartik@nvidia.com
2026-05-07 21:15:56 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Register all accessible watchdog timers Tegra186+ SoCs expose multiple watchdog timers, but the driver only registers WDT(0). Iterate over num_wdts and, for each WDT, check the SCR (firewall) registers in the TKE block to determine whether Linux has read and write access. Register the watchdogs that are accessible. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-4-kkartik@nvidia.com
2026-05-07 21:15:56 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource/drivers/timer-tegra186: Register all accessible watchdog timers Tegra186+ SoCs expose multiple watchdog timers, but the driver only registers WDT(0). Iterate over num_wdts and, for each WDT, check the SCR (firewall) registers in the TKE block to determine whether Linux has read and write access. Register the watchdogs that are accessible. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-4-kkartik@nvidia.com
2026-05-07 21:15:56 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Register all accessible watchdog timers Tegra186+ SoCs expose multiple watchdog timers, but the driver only registers WDT(0). Iterate over num_wdts and, for each WDT, check the SCR (firewall) registers in the TKE block to determine whether Linux has read and write access. Register the watchdogs that are accessible. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-4-kkartik@nvidia.com
2026-05-07 21:15:56 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Register all accessible watchdog timers Tegra186+ SoCs expose multiple watchdog timers, but the driver only registers WDT(0). Iterate over num_wdts and, for each WDT, check the SCR (firewall) registers in the TKE block to determine whether Linux has read and write access. Register the watchdogs that are accessible. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-4-kkartik@nvidia.com
2026-05-07 21:15:56 +05:30
clocksource/drivers/timer-tegra186: Reserve and service a kernel watchdog Tegra SoCs supports multiple watchdog timers. If the kernel crashes or hangs before userspace enables a watchdog, the system cannot recover and may remain bricked, e.g. after a failed OTA update. The driver currently leaves all watchdogs disabled until userspace configures them. Reserve first available watchdog as a kernel-only watchdog for Tegra186 and Tegra234. Arm it during probe (120s timeout) and keep it alive in the driver IRQ handler. Do not register it to userspace. Other available watchdogs remain exposed to userspace. This guarantees the system can reset itself in case of a hang or crash even when userspace never starts. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-5-kkartik@nvidia.com
2026-05-07 21:15:57 +05:30
clocksource/drivers/timer-tegra186: Register all accessible watchdog timers Tegra186+ SoCs expose multiple watchdog timers, but the driver only registers WDT(0). Iterate over num_wdts and, for each WDT, check the SCR (firewall) registers in the TKE block to determine whether Linux has read and write access. Register the watchdogs that are accessible. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-4-kkartik@nvidia.com
2026-05-07 21:15:56 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Correct num_wdts for Tegra186 and Tegra234 On Tegra186 and Tegra234, WDT2 is connected to the Audio Processing Engine (APE) and cannot be accessed from Linux. Only WDT0 and WDT1 are accessible to Linux. Update num_wdts from 3 to 2 for both Tegra186 and Tegra234 to reflect the actual number of watchdogs available to Linux. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-3-kkartik@nvidia.com
2026-05-07 21:15:55 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Add support for Tegra234 SoC The timer IP block present on Tegra234 SoC supports watchdog timer functionality that can be used to recover from system hangs. The watchdog timer uses a timer in the background for countdown. Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-4-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:39 +05:30
clocksource/drivers/timer-tegra186: Correct num_wdts for Tegra186 and Tegra234 On Tegra186 and Tegra234, WDT2 is connected to the Audio Processing Engine (APE) and cannot be accessed from Linux. Only WDT0 and WDT1 are accessible to Linux. Update num_wdts from 3 to 2 for both Tegra186 and Tegra234 to reflect the actual number of watchdogs available to Linux. Signed-off-by: Kartik Rajput <kkartik@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260507154557.2082697-3-kkartik@nvidia.com
2026-05-07 21:15:55 +05:30
clocksource/drivers/timer-tegra186: Add support for Tegra234 SoC The timer IP block present on Tegra234 SoC supports watchdog timer functionality that can be used to recover from system hangs. The watchdog timer uses a timer in the background for countdown. Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-4-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:39 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
clocksource/drivers/timer-tegra186: Add support for Tegra234 SoC The timer IP block present on Tegra234 SoC supports watchdog timer functionality that can be used to recover from system hangs. The watchdog timer uses a timer in the background for countdown. Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-4-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:39 +05:30
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30
Get rid of 'remove_new' relic from platform driver struct The continual trickle of small conversion patches is grating on me, and is really not helping. Just get rid of the 'remove_new' member function, which is just an alias for the plain 'remove', and had a comment to that effect: /* * .remove_new() is a relic from a prototype conversion of .remove(). * New drivers are supposed to implement .remove(). Once all drivers are * converted to not use .remove_new any more, it will be dropped. */ This was just a tree-wide 'sed' script that replaced '.remove_new' with '.remove', with some care taken to turn a subsequent tab into two tabs to make things line up. I did do some minimal manual whitespace adjustment for places that used spaces to line things up. Then I just removed the old (sic) .remove_new member function, and this is the end result. No more unnecessary conversion noise. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2024-12-01 15:12:43 -08:00
clocksource: Add Tegra186 timers support Currently this only supports a single watchdog, which uses a timer in the background for countdown. Eventually the timers could be used for various time-keeping tasks, but by default the architected timer will already provide that functionality. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/1656922422-25823-3-git-send-email-kkartik@nvidia.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-07-04 13:43:38 +05:30