From 56e992095872bf873157304e897a266619af30c7 Mon Sep 17 00:00:00 2001
From: Chen Yi Qun <chenyiqun@espressif.com>
Date: Thu, 22 Jul 2021 18:10:30 +0800
Subject: [PATCH] uart: add wakeup event for esp32c3

---
 components/driver/include/driver/uart.h       |  3 +++
 components/driver/uart.c                      | 18 +++++++++++++++++-
 components/hal/esp32c3/include/hal/uart_ll.h  |  1 +
 components/soc/esp32c3/include/soc/soc_caps.h |  1 +
 4 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/components/driver/include/driver/uart.h b/components/driver/include/driver/uart.h
index 76aa424fa2..45e2104f80 100644
--- a/components/driver/include/driver/uart.h
+++ b/components/driver/include/driver/uart.h
@@ -58,6 +58,9 @@ typedef enum {
     UART_PARITY_ERR,        /*!< UART RX parity event*/
     UART_DATA_BREAK,        /*!< UART TX data and break event*/
     UART_PATTERN_DET,       /*!< UART pattern detected */
+#if SOC_UART_SUPPORT_WAKEUP
+    UART_WAKEUP,            /*!< UART wakeup event */
+#endif
     UART_EVENT_MAX,         /*!< UART event max index*/
 } uart_event_type_t;
 
diff --git a/components/driver/uart.c b/components/driver/uart.c
index cc133237cf..22bc7fa81e 100644
--- a/components/driver/uart.c
+++ b/components/driver/uart.c
@@ -47,11 +47,20 @@ static const char *UART_TAG = "uart";
 #define UART_PATTERN_DET_QLEN_DEFAULT   (10)
 #define UART_MIN_WAKEUP_THRESH          (UART_LL_MIN_WAKEUP_THRESH)
 
+#if SOC_UART_SUPPORT_WAKEUP
+#define UART_INTR_CONFIG_FLAG ((UART_INTR_RXFIFO_FULL) \
+                            | (UART_INTR_RXFIFO_TOUT) \
+                            | (UART_INTR_RXFIFO_OVF) \
+                            | (UART_INTR_BRK_DET) \
+                            | (UART_INTR_PARITY_ERR)) \
+                            | (UART_INTR_WAKEUP)
+#else
 #define UART_INTR_CONFIG_FLAG ((UART_INTR_RXFIFO_FULL) \
                             | (UART_INTR_RXFIFO_TOUT) \
                             | (UART_INTR_RXFIFO_OVF) \
                             | (UART_INTR_BRK_DET) \
                             | (UART_INTR_PARITY_ERR))
+#endif
 
 #define UART_ENTER_CRITICAL_ISR(mux)    portENTER_CRITICAL_ISR(mux)
 #define UART_EXIT_CRITICAL_ISR(mux)     portEXIT_CRITICAL_ISR(mux)
@@ -1081,7 +1090,14 @@ static void UART_ISR_ATTR uart_rx_intr_handler_default(void *param)
                 uart_hal_clr_intsts_mask(&(uart_context[uart_num].hal), UART_INTR_TX_DONE);
                 xSemaphoreGiveFromISR(p_uart_obj[uart_num]->tx_done_sem, &HPTaskAwoken);
             }
-        } else {
+        }
+    #if SOC_UART_SUPPORT_WAKEUP
+        else if (uart_intr_status & UART_INTR_WAKEUP) {
+            uart_hal_clr_intsts_mask(&(uart_context[uart_num].hal), UART_INTR_WAKEUP);
+            uart_event.type = UART_WAKEUP;
+        }
+    #endif
+        else {
             uart_hal_clr_intsts_mask(&(uart_context[uart_num].hal), uart_intr_status); /*simply clear all other intr status*/
             uart_event.type = UART_EVENT_MAX;
         }
diff --git a/components/hal/esp32c3/include/hal/uart_ll.h b/components/hal/esp32c3/include/hal/uart_ll.h
index f94296327a..25f36d6e48 100644
--- a/components/hal/esp32c3/include/hal/uart_ll.h
+++ b/components/hal/esp32c3/include/hal/uart_ll.h
@@ -59,6 +59,7 @@ typedef enum {
     UART_INTR_RS485_FRM_ERR    = (0x1 << 16),
     UART_INTR_RS485_CLASH      = (0x1 << 17),
     UART_INTR_CMD_CHAR_DET     = (0x1 << 18),
+    UART_INTR_WAKEUP           = (0x1 << 19),
 } uart_intr_t;
 
 static inline void uart_ll_set_reset_core(uart_dev_t *hw, bool core_rst_en) {
diff --git a/components/soc/esp32c3/include/soc/soc_caps.h b/components/soc/esp32c3/include/soc/soc_caps.h
index f3395bb06b..30a5369c10 100644
--- a/components/soc/esp32c3/include/soc/soc_caps.h
+++ b/components/soc/esp32c3/include/soc/soc_caps.h
@@ -288,6 +288,7 @@
 
 #define SOC_UART_SUPPORT_RTC_CLK    (1)
 #define SOC_UART_SUPPORT_XTAL_CLK   (1)
+#define SOC_UART_SUPPORT_WAKEUP     (1)
 #define SOC_UART_REQUIRE_CORE_RESET (1)
 
 // UART has an extra TX_WAIT_SEND state when the FIFO is not empty and XOFF is enabled