pau: implement the pau regdma driver for esp32c6

components/esp_hw_support/CMakeLists.txt

@@ -73,6 +73,10 @@ if(NOT BOOTLOADER_BUILD)
         list(APPEND srcs "esp_ds.c")
     endif()
 
+    if(CONFIG_SOC_PAU_SUPPORTED)
+        list(APPEND srcs "port/pau_regdma.c")
+    endif()
+
     if(CONFIG_SOC_PM_CPU_RETENTION_BY_SW)
         list(APPEND srcs "sleep_cpu_asm.S")
         set_property(TARGET ${COMPONENT_LIB}

components/esp_hw_support/include/esp_private/esp_pau.h

@@ -0,0 +1,64 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include "soc/soc.h"
+#include "soc/soc_caps.h"
+
+#if SOC_PAU_SUPPORTED
+#include "hal/pau_hal.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Set the addresses of all REGDMA Links
+ * @param link_entries all linked lists addresses
+ */
+void pau_regdma_set_entry_link_addr(pau_regdma_link_addr_t *link_entries);
+
+/**
+ * @brief Set the address of WiFi MAC REGDMA Link in modem state
+ * @param link_addr linked lists address
+ */
+void pau_regdma_set_modem_link_addr(void *link_addr);
+
+/**
+ * @brief Software trigger regdma to perform modem link backup
+ */
+void pau_regdma_trigger_modem_link_backup(void);
+
+/**
+ * @brief Software trigger regdma to perform modem link restore
+ */
+void pau_regdma_trigger_modem_link_restore(void);
+
+/**
+ * @brief Set the address of extra REGDMA Link in active state
+ * @param link_addr linked lists address
+ */
+void pau_regdma_set_extra_link_addr(void *link_addr);
+
+/**
+ * @brief Software trigger regdma to perform extra link backup
+ */
+void pau_regdma_trigger_extra_link_backup(void);
+
+/**
+ * @brief Software trigger regdma to perform extra link restore
+ */
+void pau_regdma_trigger_extra_link_restore(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //SOC_PAU_SUPPORTED

components/esp_hw_support/port/pau_regdma.c

@@ -0,0 +1,69 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <esp_types.h>
+#include "sdkconfig.h"
+#include "esp_attr.h"
+#include "soc/soc.h"
+#include "esp_private/esp_pau.h"
+#include "esp_log.h"
+#include "soc/pcr_reg.h"
+
+static __attribute__((unused)) const char *TAG = "pau_regdma";
+
+typedef struct {
+    pau_hal_context_t *hal;
+} pau_context_t;
+
+pau_context_t * __attribute__((weak)) PAU_instance(void)
+{
+    static pau_hal_context_t pau_hal = { .dev = &PAU };
+    static pau_context_t pau_context = { .hal = &pau_hal };
+    *(volatile uint32_t *)PCR_REGDMA_CONF_REG |= PCR_REGDMA_CLK_EN;
+    return &pau_context;
+}
+
+void pau_regdma_set_entry_link_addr(pau_regdma_link_addr_t *link_entries)
+{
+    ESP_LOGD(TAG, "All link addresses %p,%p,%p,%p", (*link_entries)[0], (*link_entries)[1], (*link_entries)[2], (*link_entries)[3]);
+    pau_hal_set_regdma_entry_link_addr(PAU_instance()->hal, link_entries);
+}
+
+void pau_regdma_set_modem_link_addr(void *link_addr)
+{
+    pau_hal_set_regdma_modem_link_addr(PAU_instance()->hal, link_addr);
+}
+
+void pau_regdma_trigger_modem_link_backup(void)
+{
+    pau_hal_start_regdma_modem_link(PAU_instance()->hal, true);
+    pau_hal_stop_regdma_modem_link(PAU_instance()->hal);
+}
+
+void pau_regdma_trigger_modem_link_restore(void)
+{
+    pau_hal_start_regdma_modem_link(PAU_instance()->hal, false);
+    pau_hal_stop_regdma_modem_link(PAU_instance()->hal);
+}
+
+void pau_regdma_set_extra_link_addr(void *link_addr)
+{
+    pau_hal_set_regdma_extra_link_addr(PAU_instance()->hal, link_addr);
+}
+
+void pau_regdma_trigger_extra_link_backup(void)
+{
+    pau_hal_start_regdma_extra_link(PAU_instance()->hal, true);
+    pau_hal_stop_regdma_extra_link(PAU_instance()->hal);
+}
+
+void pau_regdma_trigger_extra_link_restore(void)
+{
+    pau_hal_start_regdma_extra_link(PAU_instance()->hal, false);
+    pau_hal_stop_regdma_extra_link(PAU_instance()->hal);
+}

components/hal/include/hal/pau_types.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2020-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */