btbb: support register retention in esp32c6

components/esp_hw_support/include/esp_private/esp_regdma.h

@@ -40,7 +40,7 @@ extern "C" {
 #define REGDMA_SPIMEM_LINK(_pri)            ((0x13 << 8) | _pri)
 #define REGDMA_SYSTIMER_LINK(_pri)          ((0x14 << 8) | _pri)
 #define REGDMA_BLE_MAC_LINK(_pri)           ((0x15 << 8) | _pri)
-#define REGDMA_BB_LINK(_pri)                ((0x16 << 8) | _pri)
+#define REGDMA_MODEM_BT_BB_LINK(_pri)       ((0x16 << 8) | _pri)
 #define REGDMA_MODEM_FE_LINK(_pri)          ((0xFF << 8) | _pri)
 
 typedef enum {

components/esp_phy/esp32c6/include/btbb_retention_reg.h

@@ -0,0 +1,24 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// btbb sleep retention reg
+
+#define BB_PART_0_SIZE 93
+#define BB_PART_1_SIZE 62
+#define BB_PART_2_SIZE 19
+#define BB_PART_0_ADDR 0x600A2000
+#define BB_PART_1_ADDR 0x600A2800
+#define BB_PART_2_ADDR 0x600A2C00
+
+#ifdef __cplusplus
+}
+#endif

components/esp_phy/src/btbb_init.c

@@ -5,6 +5,8 @@
  */
 
 #include <stdint.h>
+#include "esp_check.h"
+#include "esp_log.h"
 #include "freertos/FreeRTOS.h"
 #include "esp_private/btbb.h"
 
@@ -14,11 +16,46 @@ static _lock_t s_btbb_access_lock;
 /* Reference count of enabling BT BB */
 static uint8_t s_btbb_access_ref = 0;
 
+
+#if SOC_PM_MODEM_RETENTION_BY_REGDMA && CONFIG_FREERTOS_USE_TICKLESS_IDLE
+#include "esp_private/sleep_retention.h"
+#include "btbb_retention_reg.h"
+static const char* TAG = "btbb_init";
+
+#if SOC_PM_RETENTION_HAS_CLOCK_BUG
+#define BTBB_LINK_OWNER  ENTRY(3)
+#else
+#define BTBB_LINK_OWNER  ENTRY(0) | ENTRY(2)
+#endif // SOC_PM_RETENTION_HAS_CLOCK_BUG
+
+static esp_err_t btbb_sleep_retention_init(void)
+{
+    const static sleep_retention_entries_config_t btbb_regs_retention[] = {
+        [0] = { .config = REGDMA_LINK_CONTINUOUS_INIT(REGDMA_MODEM_BT_BB_LINK(0x00), BB_PART_0_ADDR, BB_PART_0_ADDR, BB_PART_0_SIZE, 0, 0), .owner = BTBB_LINK_OWNER },
+        [1] = { .config = REGDMA_LINK_CONTINUOUS_INIT(REGDMA_MODEM_BT_BB_LINK(0x01), BB_PART_1_ADDR, BB_PART_1_ADDR, BB_PART_1_SIZE, 0, 0), .owner = BTBB_LINK_OWNER },
+        [2] = { .config = REGDMA_LINK_CONTINUOUS_INIT(REGDMA_MODEM_BT_BB_LINK(0x02), BB_PART_2_ADDR, BB_PART_2_ADDR, BB_PART_2_SIZE, 0, 0), .owner = BTBB_LINK_OWNER }
+    };
+    esp_err_t err = sleep_retention_entries_create(btbb_regs_retention, ARRAY_SIZE(btbb_regs_retention), REGDMA_LINK_PRI_5, SLEEP_RETENTION_MODULE_BLE_BB);
+    ESP_RETURN_ON_ERROR(err, TAG, "failed to allocate memory for btbb retention");
+    ESP_LOGI(TAG, "btbb sleep retention initialization");
+    return ESP_OK;
+}
+
+static void btbb_sleep_retention_deinit(void)
+{
+    sleep_retention_entries_destroy(SLEEP_RETENTION_MODULE_BLE_BB);
+}
+#endif // SOC_PM_MODEM_RETENTION_BY_REGDMA && CONFIG_FREERTOS_USE_TICKLESS_IDLE
+
+
 void esp_btbb_enable(void)
 {
     _lock_acquire(&s_btbb_access_lock);
     if (s_btbb_access_ref == 0) {
         bt_bb_v2_init_cmplx(BTBB_ENABLE_VERSION_PRINT);
+#if SOC_PM_MODEM_RETENTION_BY_REGDMA && CONFIG_FREERTOS_USE_TICKLESS_IDLE
+        btbb_sleep_retention_init();
+#endif // SOC_PM_MODEM_RETENTION_BY_REGDMA && CONFIG_FREERTOS_USE_TICKLESS_IDLE
     }
     s_btbb_access_ref++;
     _lock_release(&s_btbb_access_lock);
@@ -27,8 +64,10 @@ void esp_btbb_enable(void)
 void esp_btbb_disable(void)
 {
     _lock_acquire(&s_btbb_access_lock);
-    if (s_btbb_access_ref > 0) {
+    if (s_btbb_access_ref && (--s_btbb_access_ref == 0)) {
-        s_btbb_access_ref--;
+#if SOC_PM_MODEM_RETENTION_BY_REGDMA && CONFIG_FREERTOS_USE_TICKLESS_IDLE
+        btbb_sleep_retention_deinit();
+#endif // SOC_PM_MODEM_RETENTION_BY_REGDMA && CONFIG_FREERTOS_USE_TICKLESS_IDLE
     }
     _lock_release(&s_btbb_access_lock);
 }