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Merge branch 'feature/etm_driver' into 'master'
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Event Task Matrix (ETM) driver

Closes IDF-5808, IDF-6032, and IDF-5922

See merge request espressif/esp-idf!19008
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@suda-morris
suda-morris committed Nov 23, 2022
2 parents b4580a1 + 4019e30 commit fefe6f3
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Showing 85 changed files with 3,875 additions and 537 deletions.
10 changes: 9 additions & 1 deletion components/driver/CMakeLists.txt
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Expand Up @@ -3,7 +3,7 @@ idf_build_get_property(target IDF_TARGET)
set(srcs
"gpio/gpio.c"
"gpio/rtc_io.c"
"gptimer.c"
"gptimer/gptimer.c"
"sdspi_crc.c"
"sdspi_host.c"
"sdspi_transaction.c"
Expand All @@ -25,6 +25,10 @@ if(CONFIG_SOC_LEDC_SUPPORTED)
list(APPEND srcs "ledc.c")
endif()

if(CONFIG_SOC_TIMER_SUPPORT_ETM)
list(APPEND srcs "gptimer/gptimer_etm.c")
endif()

if(CONFIG_SOC_I2C_SUPPORTED)
list(APPEND srcs "i2c.c")
endif()
Expand Down Expand Up @@ -65,6 +69,10 @@ if(CONFIG_SOC_PCNT_SUPPORTED)
list(APPEND srcs "pulse_cnt.c" "deprecated/pcnt_legacy.c")
endif()

if(CONFIG_SOC_GPIO_SUPPORT_ETM)
list(APPEND srcs "gpio/gpio_etm.c")
endif()

if(CONFIG_SOC_SDMMC_HOST_SUPPORTED)
list(APPEND srcs "sdmmc_transaction.c" "sdmmc_host.c")
endif()
Expand Down
305 changes: 305 additions & 0 deletions components/driver/gpio/gpio_etm.c
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@@ -0,0 +1,305 @@
/*
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/

#include <stdlib.h>
#include <string.h>
#include <sys/cdefs.h>
#include "sdkconfig.h"
#if CONFIG_ETM_ENABLE_DEBUG_LOG
// The local log level must be defined before including esp_log.h
// Set the maximum log level for this source file
#define LOG_LOCAL_LEVEL ESP_LOG_DEBUG
#endif
#include "freertos/FreeRTOS.h"
#include "driver/gpio.h"
#include "driver/gpio_etm.h"
#include "esp_heap_caps.h"
#include "esp_log.h"
#include "esp_check.h"
#include "soc/soc_caps.h"
#include "hal/gpio_ll.h"
#include "hal/gpio_etm_ll.h"
#include "esp_private/etm_interface.h"

#define ETM_MEM_ALLOC_CAPS MALLOC_CAP_DEFAULT

static const char *TAG = "gpio-etm";

typedef struct gpio_etm_task_t gpio_etm_task_t;
typedef struct gpio_etm_event_t gpio_etm_event_t;

typedef struct gpio_etm_group_t {
portMUX_TYPE spinlock;
gpio_etm_dev_t *dev;
gpio_etm_task_t *tasks[SOC_GPIO_ETM_TASKS_PER_GROUP];
gpio_etm_event_t *events[SOC_GPIO_ETM_EVENTS_PER_GROUP];
} gpio_etm_group_t;

struct gpio_etm_event_t {
esp_etm_event_t base;
int chan_id;
gpio_etm_group_t *group;
};

struct gpio_etm_task_t {
esp_etm_task_t base;
int chan_id;
gpio_etm_group_t *group;
size_t num_of_gpios; // record the number of GPIOs that are bound to the etm task
};

static gpio_etm_group_t s_gpio_etm_group = {
.dev = &GPIO_ETM,
.spinlock = portMUX_INITIALIZER_UNLOCKED,
};

static esp_err_t gpio_etm_event_register_to_group(gpio_etm_event_t *event)
{
gpio_etm_group_t *group = &s_gpio_etm_group;
int chan_id = -1;
// loop to search free one in the group
portENTER_CRITICAL(&group->spinlock);
for (int j = 0; j < SOC_GPIO_ETM_EVENTS_PER_GROUP; j++) {
if (!group->events[j]) {
chan_id = j;
group->events[j] = event;
break;
}
}
portEXIT_CRITICAL(&group->spinlock);

ESP_RETURN_ON_FALSE(chan_id != -1, ESP_ERR_NOT_FOUND, TAG, "no free event channel");
event->group = group;
event->chan_id = chan_id;
return ESP_OK;
}

static esp_err_t gpio_etm_task_register_to_group(gpio_etm_task_t *task)
{
gpio_etm_group_t *group = &s_gpio_etm_group;
int chan_id = -1;
// loop to search free one in the group
portENTER_CRITICAL(&group->spinlock);
for (int j = 0; j < SOC_GPIO_ETM_TASKS_PER_GROUP; j++) {
if (!group->tasks[j]) {
chan_id = j;
group->tasks[j] = task;
break;
}
}
portEXIT_CRITICAL(&group->spinlock);

ESP_RETURN_ON_FALSE(chan_id != -1, ESP_ERR_NOT_FOUND, TAG, "no free task channel");
task->group = group;
task->chan_id = chan_id;
return ESP_OK;
}

static void gpio_etm_event_unregister_from_group(gpio_etm_event_t *event)
{
gpio_etm_group_t *group = event->group;
int chan_id = event->chan_id;
portENTER_CRITICAL(&group->spinlock);
group->events[chan_id] = NULL;
portEXIT_CRITICAL(&group->spinlock);
}

static void gpio_etm_task_unregister_from_group(gpio_etm_task_t *task)
{
gpio_etm_group_t *group = task->group;
int chan_id = task->chan_id;
portENTER_CRITICAL(&group->spinlock);
group->tasks[chan_id] = NULL;
portEXIT_CRITICAL(&group->spinlock);
}

static esp_err_t gpio_etm_event_destroy(gpio_etm_event_t *event)
{
if (event->group) {
gpio_etm_event_unregister_from_group(event);
}
free(event);
return ESP_OK;
}

static esp_err_t gpio_etm_task_destroy(gpio_etm_task_t *task)
{
if (task->group) {
gpio_etm_task_unregister_from_group(task);
}
free(task);
return ESP_OK;
}

static esp_err_t gpio_del_etm_event(esp_etm_event_t *event)
{
gpio_etm_event_t *gpio_event = __containerof(event, gpio_etm_event_t, base);
gpio_etm_group_t *group = gpio_event->group;
// disable event channel
gpio_ll_etm_enable_event_channel(group->dev, gpio_event->chan_id, false);
gpio_etm_event_destroy(gpio_event);
return ESP_OK;
}

static esp_err_t gpio_del_etm_task(esp_etm_task_t *task)
{
gpio_etm_task_t *gpio_task = __containerof(task, gpio_etm_task_t, base);
// make sure user has called `gpio_etm_task_rm_gpio` to clean the etm task channel
ESP_RETURN_ON_FALSE(gpio_task->num_of_gpios == 0, ESP_ERR_INVALID_STATE, TAG, "some GPIO till bounded to the etm task");
gpio_etm_task_destroy(gpio_task);
return ESP_OK;
}

esp_err_t gpio_new_etm_event(const gpio_etm_event_config_t *config, esp_etm_event_handle_t *ret_event)
{
#if CONFIG_ETM_ENABLE_DEBUG_LOG
esp_log_level_set(TAG, ESP_LOG_DEBUG);
#endif
esp_err_t ret = ESP_OK;
gpio_etm_event_t *event = NULL;
ESP_GOTO_ON_FALSE(config && ret_event, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");

event = heap_caps_calloc(1, sizeof(gpio_etm_event_t), ETM_MEM_ALLOC_CAPS);
ESP_GOTO_ON_FALSE(event, ESP_ERR_NO_MEM, err, TAG, "no mem for event channel");
// register the event channel to the group
ESP_GOTO_ON_ERROR(gpio_etm_event_register_to_group(event), err, TAG, "register event channel to group failed");
int chan_id = event->chan_id;

uint32_t event_id = 0;
switch (config->edge) {
case GPIO_ETM_EVENT_EDGE_ANY:
event_id = GPIO_LL_ETM_EVENT_ID_ANY_EDGE(chan_id);
break;
case GPIO_ETM_EVENT_EDGE_POS:
event_id = GPIO_LL_ETM_EVENT_ID_POS_EDGE(chan_id);
break;
case GPIO_ETM_EVENT_EDGE_NEG:
event_id = GPIO_LL_ETM_EVENT_ID_NEG_EDGE(chan_id);
break;
default:
ESP_GOTO_ON_FALSE(false, ESP_ERR_INVALID_ARG, err, TAG, "invalid edge");
}

event->base.del = gpio_del_etm_event;
event->base.event_id = event_id;
event->base.trig_periph = ETM_TRIG_PERIPH_GPIO;
ESP_LOGD(TAG, "new event @%p, event_id=%"PRIu32", chan_id=%d", event, event_id, chan_id);
*ret_event = &event->base;
return ESP_OK;

err:
if (event) {
gpio_etm_event_destroy(event);
}
return ret;
}

esp_err_t gpio_new_etm_task(const gpio_etm_task_config_t *config, esp_etm_task_handle_t *ret_task)
{
#if CONFIG_ETM_ENABLE_DEBUG_LOG
esp_log_level_set(TAG, ESP_LOG_DEBUG);
#endif
esp_err_t ret = ESP_OK;
gpio_etm_task_t *task = NULL;
ESP_GOTO_ON_FALSE(config && ret_task, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");

task = heap_caps_calloc(1, sizeof(gpio_etm_task_t), ETM_MEM_ALLOC_CAPS);
ESP_GOTO_ON_FALSE(task, ESP_ERR_NO_MEM, err, TAG, "no mem for task channel");
// register the task channel to the group
ESP_GOTO_ON_ERROR(gpio_etm_task_register_to_group(task), err, TAG, "register task channel to group failed");
int chan_id = task->chan_id;

uint32_t task_id = 0;
switch (config->action) {
case GPIO_ETM_TASK_ACTION_SET:
task_id = GPIO_LL_ETM_TASK_ID_SET(chan_id);
break;
case GPIO_ETM_TASK_ACTION_CLR:
task_id = GPIO_LL_ETM_TASK_ID_CLR(chan_id);
break;
case GPIO_ETM_TASK_ACTION_TOG:
task_id = GPIO_LL_ETM_TASK_ID_TOG(chan_id);
break;
default:
ESP_GOTO_ON_FALSE(false, ESP_ERR_INVALID_ARG, err, TAG, "invalid action");
}

task->base.del = gpio_del_etm_task;
task->base.task_id = task_id;
task->base.trig_periph = ETM_TRIG_PERIPH_GPIO;
ESP_LOGD(TAG, "new task @%p, task_id=%"PRIu32", chan_id=%d", task, task_id, chan_id);
*ret_task = &task->base;
return ESP_OK;

err:
if (task) {
gpio_etm_task_destroy(task);
}
return ret;
}

esp_err_t gpio_etm_event_bind_gpio(esp_etm_event_handle_t event, int gpio_num)
{
ESP_RETURN_ON_FALSE(event, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
ESP_RETURN_ON_FALSE(event->trig_periph == ETM_TRIG_PERIPH_GPIO, ESP_ERR_INVALID_ARG, TAG, "not a gpio etm event");
ESP_RETURN_ON_FALSE(GPIO_IS_VALID_GPIO(gpio_num), ESP_ERR_INVALID_ARG, TAG, "gpio is not input capable");
gpio_etm_event_t *gpio_event = __containerof(event, gpio_etm_event_t, base);
gpio_etm_group_t *group = gpio_event->group;
// disable gpio etm event channel first
gpio_ll_etm_enable_event_channel(group->dev, gpio_event->chan_id, false);
// then set the gpio number
gpio_ll_etm_event_channel_set_gpio(group->dev, gpio_event->chan_id, gpio_num);
// enable gpio etm event channel again
gpio_ll_etm_enable_event_channel(group->dev, gpio_event->chan_id, true);
return ESP_OK;
}

esp_err_t gpio_etm_task_add_gpio(esp_etm_task_handle_t task, int gpio_num)
{
ESP_RETURN_ON_FALSE(task, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
ESP_RETURN_ON_FALSE(task->trig_periph == ETM_TRIG_PERIPH_GPIO, ESP_ERR_INVALID_ARG, TAG, "not a gpio etm task");
ESP_RETURN_ON_FALSE(GPIO_IS_VALID_OUTPUT_GPIO(gpio_num), ESP_ERR_INVALID_ARG, TAG, "gpio is not output capable");
gpio_etm_task_t *gpio_task = __containerof(task, gpio_etm_task_t, base);
gpio_etm_group_t *group = gpio_task->group;
bool gpio_not_enabled = true;
// use spinlock as this function may be called with different task object in different threads
// and the gpio_num might reside in the same register
portENTER_CRITICAL(&group->spinlock);
// check if the gpio has been enabled
if (!gpio_ll_etm_is_task_gpio_enabled(group->dev, gpio_num)) {
gpio_ll_etm_gpio_set_task_channel(group->dev, gpio_num, gpio_task->chan_id);
gpio_ll_etm_enable_task_gpio(group->dev, gpio_num, true);
} else {
gpio_not_enabled = false;
}
portEXIT_CRITICAL(&group->spinlock);
ESP_RETURN_ON_FALSE(gpio_not_enabled, ESP_ERR_INVALID_STATE, TAG, "gpio already enabled by other task channel");
gpio_task->num_of_gpios++;
return ESP_OK;
}

esp_err_t gpio_etm_task_rm_gpio(esp_etm_task_handle_t task, int gpio_num)
{
ESP_RETURN_ON_FALSE(task, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
ESP_RETURN_ON_FALSE(GPIO_IS_VALID_OUTPUT_GPIO(gpio_num), ESP_ERR_INVALID_ARG, TAG, "gpio is not output capable");
gpio_etm_task_t *gpio_task = __containerof(task, gpio_etm_task_t, base);
gpio_etm_group_t *group = gpio_task->group;
bool gpio_enabled_by_this_task = true;
// use spinlock as this function may be called with different task object in different threads
// and the gpio_num might reside in the same register
portENTER_CRITICAL(&group->spinlock);
// check if the gpio is managed by this etm task channel
if (gpio_ll_etm_is_task_gpio_enabled(group->dev, gpio_num) &&
(gpio_ll_etm_gpio_get_task_channel(group->dev, gpio_num) == gpio_task->chan_id)) {
gpio_ll_etm_enable_task_gpio(group->dev, gpio_num, false);
} else {
gpio_enabled_by_this_task = false;
}
portEXIT_CRITICAL(&group->spinlock);
ESP_RETURN_ON_FALSE(gpio_enabled_by_this_task, ESP_ERR_INVALID_STATE, TAG, "gpio is not enabled by this task channel");
gpio_task->num_of_gpios--;
return ESP_OK;
}

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