feat(etm): support sleep retention

components/soc/esp32c61/etm_periph.c

@@ -0,0 +1,44 @@
+/*
+ * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "soc/etm_periph.h"
+#include "soc/soc_etm_reg.h"
+
+/**
+ * ETM Registers to be saved during sleep retention
+ * - Channel configuration registers, e.g.: SOC_ETM_CH0_EVT_ID_REG, SOC_ETM_CH0_TASK_ID_REG
+*/
+#define ETM_RETENTION_REGS_CNT ((SOC_ETM_CH49_TASK_ID_REG - SOC_ETM_CH0_EVT_ID_REG) / 4 + 1)
+
+static const regdma_entries_config_t etm_regdma_entries[] = {
+    // backup stage: save the status of enabled channels
+    // restore stage: store the enabled channels
+    [0] = {
+        .config = REGDMA_LINK_CONTINUOUS_INIT(REGDMA_ETM_LINK(0x00),
+        SOC_ETM_CH_ENA_AD0_REG, SOC_ETM_CH_ENA_AD0_SET_REG, 1, 0, 0),
+        .owner = ENTRY(0) | ENTRY(2),
+    },
+    [1] = {
+        .config = REGDMA_LINK_CONTINUOUS_INIT(REGDMA_ETM_LINK(0x01),
+        SOC_ETM_CH_ENA_AD1_REG, SOC_ETM_CH_ENA_AD1_SET_REG, 1, 0, 0),
+        .owner = ENTRY(0) | ENTRY(2),
+    },
+    // backup stage: save configuration registers
+    // restore stage: restore the configuration registers
+    [2] = {
+        .config = REGDMA_LINK_CONTINUOUS_INIT(REGDMA_ETM_LINK(0x02),
+        SOC_ETM_CH0_EVT_ID_REG, SOC_ETM_CH0_EVT_ID_REG, ETM_RETENTION_REGS_CNT, 0, 0),
+        .owner = ENTRY(0) | ENTRY(2),
+    },
+};
+
+const etm_reg_retention_info_t etm_reg_retention_info[SOC_ETM_GROUPS] = {
+    [0] = {
+        .module = SLEEP_RETENTION_MODULE_ETM0,
+        .regdma_entry_array = etm_regdma_entries,
+        .array_size = ARRAY_SIZE(etm_regdma_entries)
+    },
+};