ledc:add option to put LEDC function into IRAM

The caches are disabled when reading/writing/erasing flash.
All CPUs should always execute code and access data from internal RAM.
Add an IRAM option to enhance the performance of LEDC.

Closes https://github.com/espressif/esp-idf/issues/11554

components/driver/Kconfig

@@ -538,4 +538,14 @@ menu "Driver Configurations"
 
     endmenu # Parallel IO Configuration
 
+    menu "LEDC Configuration"
+        config LEDC_CTRL_FUNC_IN_IRAM
+            bool "Place LEDC control functions into IRAM"
+            default n
+            help
+                Place LEDC control functions (ledc_update_duty and ledc_stop) into IRAM,
+                so that these functions can be IRAM-safe and able to be called in an IRAM context.
+                Enabling this option can improve driver performance as well.
+    endmenu # LEDC Configuration
+
 endmenu  # Driver configurations

components/driver/ledc/include/driver/ledc.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -141,6 +141,9 @@ esp_err_t ledc_timer_config(const ledc_timer_config_t *timer_conf);
  * @note  ledc_set_duty, ledc_set_duty_with_hpoint and ledc_update_duty are not thread-safe, do not call these functions to
  *        control one LEDC channel in different tasks at the same time.
  *        A thread-safe version of API is ledc_set_duty_and_update
+ * @note  If `CONFIG_LEDC_CTRL_FUNC_IN_IRAM` is enabled, this function will be placed in the IRAM by linker,
+ *        makes it possible to execute even when the Cache is disabled.
+ * @note  This function is allowed to run within ISR context.
  * @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
  * @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
  *
@@ -171,6 +174,9 @@ esp_err_t ledc_set_pin(int gpio_num, ledc_mode_t speed_mode, ledc_channel_t ledc
  * @brief LEDC stop.
  *        Disable LEDC output, and set idle level
  *
+ * @note  If `CONFIG_LEDC_CTRL_FUNC_IN_IRAM` is enabled, this function will be placed in the IRAM by linker,
+ *        makes it possible to execute even when the Cache is disabled.
+ * @note  This function is allowed to run within ISR context.
  * @param  speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
  * @param  channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
  * @param  idle_level Set output idle level after LEDC stops.

components/driver/ledc/ledc.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -26,6 +26,8 @@ static __attribute__((unused)) const char *LEDC_TAG = "ledc";
 
 #define LEDC_CHECK(a, str, ret_val) ESP_RETURN_ON_FALSE(a, ret_val, LEDC_TAG, "%s", str)
 #define LEDC_ARG_CHECK(a, param) ESP_RETURN_ON_FALSE(a, ESP_ERR_INVALID_ARG, LEDC_TAG, param " argument is invalid")
+#define LEDC_CHECK_ISR(a, str, ret_val) ESP_RETURN_ON_FALSE_ISR(a, ret_val, LEDC_TAG, "%s", str)
+#define LEDC_ARG_CHECK_ISR(a, param) ESP_RETURN_ON_FALSE_ISR(a, ESP_ERR_INVALID_ARG, LEDC_TAG, param " argument is invalid")
 
 #define LEDC_CLK_NOT_FOUND  0
 #define LEDC_SLOW_CLK_UNINIT -1
@@ -705,26 +707,26 @@ static void _ledc_update_duty(ledc_mode_t speed_mode, ledc_channel_t channel)
 
 esp_err_t ledc_update_duty(ledc_mode_t speed_mode, ledc_channel_t channel)
 {
-    LEDC_ARG_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, "speed_mode");
-    LEDC_ARG_CHECK(channel < LEDC_CHANNEL_MAX, "channel");
-    LEDC_CHECK(p_ledc_obj[speed_mode] != NULL, LEDC_NOT_INIT, ESP_ERR_INVALID_STATE);
-    portENTER_CRITICAL(&ledc_spinlock);
+    LEDC_ARG_CHECK_ISR(speed_mode < LEDC_SPEED_MODE_MAX, "speed_mode");
+    LEDC_ARG_CHECK_ISR(channel < LEDC_CHANNEL_MAX, "channel");
+    LEDC_CHECK_ISR(p_ledc_obj[speed_mode] != NULL, LEDC_NOT_INIT, ESP_ERR_INVALID_STATE);
+    portENTER_CRITICAL_SAFE(&ledc_spinlock);
     _ledc_update_duty(speed_mode, channel);
-    portEXIT_CRITICAL(&ledc_spinlock);
+    portEXIT_CRITICAL_SAFE(&ledc_spinlock);
     return ESP_OK;
 }
 
 esp_err_t ledc_stop(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t idle_level)
 {
-    LEDC_ARG_CHECK(speed_mode < LEDC_SPEED_MODE_MAX, "speed_mode");
-    LEDC_ARG_CHECK(channel < LEDC_CHANNEL_MAX, "channel");
-    LEDC_CHECK(p_ledc_obj[speed_mode] != NULL, LEDC_NOT_INIT, ESP_ERR_INVALID_STATE);
-    portENTER_CRITICAL(&ledc_spinlock);
+    LEDC_ARG_CHECK_ISR(speed_mode < LEDC_SPEED_MODE_MAX, "speed_mode");
+    LEDC_ARG_CHECK_ISR(channel < LEDC_CHANNEL_MAX, "channel");
+    LEDC_CHECK_ISR(p_ledc_obj[speed_mode] != NULL, LEDC_NOT_INIT, ESP_ERR_INVALID_STATE);
+    portENTER_CRITICAL_SAFE(&ledc_spinlock);
     ledc_hal_set_idle_level(&(p_ledc_obj[speed_mode]->ledc_hal), channel, idle_level);
     ledc_hal_set_sig_out_en(&(p_ledc_obj[speed_mode]->ledc_hal), channel, false);
     ledc_hal_set_duty_start(&(p_ledc_obj[speed_mode]->ledc_hal), channel, false);
     ledc_ls_channel_update(speed_mode, channel);
-    portEXIT_CRITICAL(&ledc_spinlock);
+    portEXIT_CRITICAL_SAFE(&ledc_spinlock);
     return ESP_OK;
 }
 

components/driver/linker.lf

@@ -27,3 +27,7 @@ entries:
         dac_continuous: dac_continuous_write_asynchronously (noflash)
     if MCPWM_CTRL_FUNC_IN_IRAM = y:
         mcpwm_cmpr: mcpwm_comparator_set_compare_value (noflash)
+    if LEDC_CTRL_FUNC_IN_IRAM = y:
+        ledc: ledc_stop (noflash)
+        ledc: ledc_update_duty (noflash)
+        ledc: _ledc_update_duty (noflash)

components/driver/test_apps/ledc/sdkconfig.ci.iram_safe

@@ -6,3 +6,4 @@ CONFIG_FREERTOS_PLACE_FUNCTIONS_INTO_FLASH=y
 CONFIG_COMPILER_OPTIMIZATION_CHECKS_SILENT=y
 # ledc driver uses assert in the ISR code path
 CONFIG_COMPILER_OPTIMIZATION_ASSERTIONS_DISABLE=y
+CONFIG_LEDC_CTRL_FUNC_IN_IRAM=y

components/hal/esp32/include/hal/ledc_ll.h

@@ -408,6 +408,7 @@ static inline void ledc_ll_set_fade_param(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_sig_out_en(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, bool sig_out_en)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.sig_out_en = sig_out_en;
@@ -438,6 +439,7 @@ static inline void ledc_ll_set_duty_start(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_idle_level(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, uint32_t idle_level)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.idle_lv = idle_level & 0x1;

components/hal/esp32c2/include/hal/ledc_ll.h

@@ -393,6 +393,7 @@ static inline void ledc_ll_set_fade_param(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_sig_out_en(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, bool sig_out_en)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.sig_out_en = sig_out_en;
@@ -423,6 +424,7 @@ static inline void ledc_ll_set_duty_start(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_idle_level(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, uint32_t idle_level)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.idle_lv = idle_level & 0x1;

components/hal/esp32c3/include/hal/ledc_ll.h

@@ -393,6 +393,7 @@ static inline void ledc_ll_set_fade_param(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_sig_out_en(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, bool sig_out_en)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.sig_out_en = sig_out_en;
@@ -423,6 +424,7 @@ static inline void ledc_ll_set_duty_start(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_idle_level(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, uint32_t idle_level)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.idle_lv = idle_level & 0x1;

components/hal/esp32c6/include/hal/ledc_ll.h

@@ -491,6 +491,7 @@ static inline void ledc_ll_get_fade_param(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_sig_out_en(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, bool sig_out_en)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.sig_out_en = sig_out_en;
@@ -521,6 +522,7 @@ static inline void ledc_ll_set_duty_start(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_idle_level(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, uint32_t idle_level)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.idle_lv = idle_level & 0x1;

components/hal/esp32h2/include/hal/ledc_ll.h

@@ -489,6 +489,7 @@ static inline void ledc_ll_get_fade_param(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_sig_out_en(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, bool sig_out_en)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.sig_out_en = sig_out_en;
@@ -519,6 +520,7 @@ static inline void ledc_ll_set_duty_start(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_idle_level(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, uint32_t idle_level)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.idle_lv = idle_level & 0x1;

components/hal/esp32s2/include/hal/ledc_ll.h

@@ -425,6 +425,7 @@ static inline void ledc_ll_set_fade_param(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_sig_out_en(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, bool sig_out_en)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.sig_out_en = sig_out_en;
@@ -455,6 +456,7 @@ static inline void ledc_ll_set_duty_start(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_idle_level(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, uint32_t idle_level)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.idle_lv = idle_level & 0x1;

components/hal/esp32s3/include/hal/ledc_ll.h

@@ -394,6 +394,7 @@ static inline void ledc_ll_set_fade_param(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_sig_out_en(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, bool sig_out_en)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.sig_out_en = sig_out_en;
@@ -424,6 +425,7 @@ static inline void ledc_ll_set_duty_start(ledc_dev_t *hw, ledc_mode_t speed_mode
  *
  * @return None
  */
+__attribute__((always_inline))
 static inline void ledc_ll_set_idle_level(ledc_dev_t *hw, ledc_mode_t speed_mode, ledc_channel_t channel_num, uint32_t idle_level)
 {
     hw->channel_group[speed_mode].channel[channel_num].conf0.idle_lv = idle_level & 0x1;