linux-kernel - [PATCH v4 1/3] platform/chrome: Update binary interface for EC-based watchdog

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Message-ID: <20240126095721.782782-2-lma@chromium.org>
Date: Fri, 26 Jan 2024 09:57:19 +0000
From: Lukasz Majczak <lma@...omium.org>
To: Gwendal Grignou <gwendal@...omium.org>,
	Tzung-Bi Shih <tzungbi@...nel.org>,
	Radoslaw Biernacki <biernacki@...gle.com>,
	Wim Van Sebroeck <wim@...ux-watchdog.org>,
	Lee Jones <lee@...nel.org>,
	Benson Leung <bleung@...omium.org>,
	Guenter Roeck <groeck@...omium.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	linux-watchdog@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	chrome-platform@...ts.linux.dev
Cc: Lukasz Majczak <lma@...omium.org>
Subject: [PATCH v4 1/3] platform/chrome: Update binary interface for EC-based watchdog

Update structures and defines related to EC_CMD_HANG_DETECT
to allow usage of new EC-based watchdog.

Signed-off-by: Lukasz Majczak <lma@...omium.org>
---
 .../linux/platform_data/cros_ec_commands.h    | 78 +++++++++----------
 1 file changed, 35 insertions(+), 43 deletions(-)

diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h
index 7dae17b62a4d..ecc47d5fe239 100644
--- a/include/linux/platform_data/cros_ec_commands.h
+++ b/include/linux/platform_data/cros_ec_commands.h
@@ -3961,60 +3961,52 @@ struct ec_response_i2c_passthru {
 } __ec_align1;
 
 /*****************************************************************************/
-/* Power button hang detect */
-
+/* AP hang detect */
 #define EC_CMD_HANG_DETECT 0x009F
 
-/* Reasons to start hang detection timer */
-/* Power button pressed */
-#define EC_HANG_START_ON_POWER_PRESS  BIT(0)
-
-/* Lid closed */
-#define EC_HANG_START_ON_LID_CLOSE    BIT(1)
-
- /* Lid opened */
-#define EC_HANG_START_ON_LID_OPEN     BIT(2)
-
-/* Start of AP S3->S0 transition (booting or resuming from suspend) */
-#define EC_HANG_START_ON_RESUME       BIT(3)
-
-/* Reasons to cancel hang detection */
+#define EC_HANG_DETECT_MIN_TIMEOUT 5
+#define EC_HANG_DETECT_MAX_TIMEOUT 65535
 
-/* Power button released */
-#define EC_HANG_STOP_ON_POWER_RELEASE BIT(8)
+/* EC hang detect commands */
+enum ec_hang_detect_cmds {
+	/* Reload AP hang detect timer. */
+	EC_HANG_DETECT_CMD_RELOAD = 0x0,
 
-/* Any host command from AP received */
-#define EC_HANG_STOP_ON_HOST_COMMAND  BIT(9)
+	/* Stop AP hang detect timer. */
+	EC_HANG_DETECT_CMD_CANCEL = 0x1,
 
-/* Stop on end of AP S0->S3 transition (suspending or shutting down) */
-#define EC_HANG_STOP_ON_SUSPEND       BIT(10)
+	/* Configure watchdog with given reboot timeout and
+	 * cancel currently running AP hang detect timer.
+	 */
+	EC_HANG_DETECT_CMD_SET_TIMEOUT = 0x2,
 
-/*
- * If this flag is set, all the other fields are ignored, and the hang detect
- * timer is started.  This provides the AP a way to start the hang timer
- * without reconfiguring any of the other hang detect settings.  Note that
- * you must previously have configured the timeouts.
- */
-#define EC_HANG_START_NOW             BIT(30)
+	/* Get last hang status - whether the AP boot was clear or not */
+	EC_HANG_DETECT_CMD_GET_STATUS = 0x3,
 
-/*
- * If this flag is set, all the other fields are ignored (including
- * EC_HANG_START_NOW).  This provides the AP a way to stop the hang timer
- * without reconfiguring any of the other hang detect settings.
- */
-#define EC_HANG_STOP_NOW              BIT(31)
+	/* Clear last hang status. Called when AP is rebooting/shutting down
+	 * gracefully.
+	 */
+	EC_HANG_DETECT_CMD_CLEAR_STATUS = 0x4
+};
 
 struct ec_params_hang_detect {
-	/* Flags; see EC_HANG_* */
-	uint32_t flags;
-
-	/* Timeout in msec before generating host event, if enabled */
-	uint16_t host_event_timeout_msec;
+	uint16_t command; /* enum ec_hang_detect_cmds */
+	/* Timeout in seconds before generating reboot */
+	uint16_t reboot_timeout_sec;
+} __ec_align2;
 
-	/* Timeout in msec before generating warm reboot, if enabled */
-	uint16_t warm_reboot_timeout_msec;
-} __ec_align4;
+/* Status codes that describe whether AP has boot normally or the hang has been
+ * detected and EC has reset AP
+ */
+enum ec_hang_detect_status {
+	EC_HANG_DETECT_AP_BOOT_NORMAL = 0x0,
+	EC_HANG_DETECT_AP_BOOT_EC_WDT = 0x1,
+	EC_HANG_DETECT_AP_BOOT_COUNT,
+};
 
+struct ec_response_hang_detect {
+	uint8_t status; /* enum ec_hang_detect_status */
+} __ec_align1;
 /*****************************************************************************/
 /* Commands for battery charging */
 
-- 
2.43.0.429.g432eaa2c6b-goog