adsp: ipc: Emergency ipc message send

Added intel_adsp_ipc_send_message_emergency function that allows to send an
ipc message notifying about emergency event, such as watchdog timeout.

Signed-off-by: Adrian Warecki <[email protected]>

Author: softwarecki

soc/xtensa/intel_adsp/common/include/intel_adsp_ipc.h

@@ -161,4 +161,17 @@ bool intel_adsp_ipc_send_message(const struct device *dev,
 bool intel_adsp_ipc_send_message_sync(const struct device *dev,
 	uint32_t data, uint32_t ext_data, k_timeout_t timeout);
 
+
+/** @brief Send an emergency IPC message.
+ *
+ * Sends a message to the other side of an IPC link. The data and ext_data parameters are passed
+ * using the IDR/IDD registers. Waits in a loop until it is possible to send a message.
+ *
+ * @param dev IPC device.
+ * @param data 30 bits value to transmit with the message (IDR register).
+ * @param ext_data Extended value to transmit with the message (IDD register).
+ */
+void intel_adsp_ipc_send_message_emergency(const struct device *dev, uint32_t data,
+					   uint32_t ext_data);
+
 #endif /* ZEPHYR_INCLUDE_INTEL_ADSP_IPC_H */

soc/xtensa/intel_adsp/common/ipc.c

@@ -166,6 +166,37 @@ bool intel_adsp_ipc_send_message_sync(const struct device *dev,
 	return ret;
 }
 
+void intel_adsp_ipc_send_message_emergency(const struct device *dev, uint32_t data,
+					   uint32_t ext_data)
+{
+	const struct intel_adsp_ipc_config * const config = dev->config;
+
+	volatile struct intel_adsp_ipc * const regs = config->regs;
+	bool done;
+
+	/* check if host is processing message. */
+	while (regs->idr & INTEL_ADSP_IPC_BUSY) {
+		k_busy_wait(1);
+	}
+
+	/* check if host has pending acknowledge msg
+	 * Same signal, but on different bits in 1.5
+	 */
+	done = IS_ENABLED(CONFIG_SOC_INTEL_CAVS_V15) ? (regs->idd & INTEL_ADSP_IPC_DONE)
+						     : (regs->ida & INTEL_ADSP_IPC_DONE);
+	if (done) {
+		/* IPC completion */
+		if (IS_ENABLED(CONFIG_SOC_INTEL_CAVS_V15)) {
+			regs->idd = INTEL_ADSP_IPC_DONE;
+		} else {
+			regs->ida = INTEL_ADSP_IPC_DONE;
+		}
+	}
+
+	regs->idd = ext_data;
+	regs->idr = data | INTEL_ADSP_IPC_BUSY;
+}
+
 #if DT_NODE_EXISTS(INTEL_ADSP_IPC_HOST_DTNODE)
 
 #if defined(CONFIG_SOC_SERIES_INTEL_ACE)