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https://github.com/espressif/esp-idf.git
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feat(gdma): add GDMA link list driver
This commit is contained in:
morris
@@ -381,7 +381,7 @@ esp_err_t dw_gdma_channel_continue(dw_gdma_channel_handle_t chan)
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esp_err_t dw_gdma_new_link_list(const dw_gdma_link_list_config_t *config, dw_gdma_link_list_handle_t *ret_list)
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{
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esp_err_t ret = ESP_OK;
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ESP_RETURN_ON_FALSE(ret_list, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
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ESP_RETURN_ON_FALSE(config && ret_list, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
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dw_gdma_link_list_item_t *items = NULL;
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dw_gdma_link_list_t *list = NULL;
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uint32_t num_items = config->num_items;
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@@ -531,7 +531,7 @@ esp_err_t dw_gdma_channel_set_block_markers(dw_gdma_channel_handle_t chan, dw_gd
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return ESP_OK;
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}
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esp_err_t dw_gdma_lli_config_transfer(dw_gdma_lli_handle_t lli, dw_gdma_block_transfer_config_t *config)
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esp_err_t dw_gdma_lli_config_transfer(dw_gdma_lli_handle_t lli, const dw_gdma_block_transfer_config_t *config)
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{
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ESP_RETURN_ON_FALSE(lli && config, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
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@@ -0,0 +1,246 @@
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/*
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* SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdatomic.h>
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#include <sys/cdefs.h>
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#include <sys/lock.h>
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#include "sdkconfig.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "soc/soc_caps.h"
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#include "esp_log.h"
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#include "esp_check.h"
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#include "esp_memory_utils.h"
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#include "esp_heap_caps.h"
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#include "esp_private/gdma_link.h"
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#include "hal/cache_hal.h"
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#include "hal/cache_ll.h"
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#include "esp_cache.h"
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static const char *TAG = "gdma";
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#if SOC_NON_CACHEABLE_OFFSET
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#define GDMA_CACHE_ADDR_TO_NON_CACHE_ADDR(addr) ((addr) + SOC_NON_CACHEABLE_OFFSET)
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#else
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#define GDMA_CACHE_ADDR_TO_NON_CACHE_ADDR(addr) (addr)
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#endif
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#define ALIGN_UP(num, align) (((num) + ((align) - 1)) & ~((align) - 1))
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#define ALIGN_DOWN(num, align) ((num) & ~((align) - 1))
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// GDMA link list item definition
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// TODO: this type will eventually become target specific, we need to move it to the LL layer or soc layer
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typedef struct gdma_link_list_item_t gdma_link_list_item_t;
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struct gdma_link_list_item_t {
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struct {
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uint32_t size : 12; /*!< Buffer size */
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uint32_t length : 12; /*!< Number of valid bytes in the buffer */
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uint32_t reversed24 : 4; /*!< Reserved */
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uint32_t err_eof : 1; /*!< Whether the received buffer contains error, the error was reported by the peripheral */
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uint32_t reserved29 : 1; /*!< Reserved */
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uint32_t suc_eof : 1; /*!< Whether the list item should notify the peripheral an "EOF" event */
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uint32_t owner : 1; /*!< Who is allowed to access the buffer */
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} dw0; /*!< list item Word 0 */
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void *buffer; /*!< Pointer to the buffer */
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gdma_link_list_item_t *next; /*!< Pointer to the next list item (set to NULL if the list item is the last one of the link) */
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};
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///< Maximum size of the buffer that can be carried by a DMA link list item
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#define GDMA_MAX_BUFFER_SIZE_PER_LINK_ITEM 4095
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typedef struct gdma_link_list_t {
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uint32_t num_items; // number of items in the link list
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size_t item_size; // size of each item
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size_t buffer_alignment; // Alignment of each buffer
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uint8_t *items; // pointer to the link list items
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uint8_t *items_nc; // pointer to the link list items, non-cached
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struct {
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uint32_t check_owner: 1; // Whether the link list is responsible for checking the ownership when mount data buffers
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} flags;
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} gdma_link_list_t;
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esp_err_t gdma_new_link_list(const gdma_link_list_config_t *config, gdma_link_list_handle_t *ret_list)
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{
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esp_err_t ret = ESP_OK;
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uint8_t *items = NULL;
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gdma_link_list_t *list = NULL;
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ESP_RETURN_ON_FALSE(config && ret_list, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
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ESP_RETURN_ON_FALSE(config->num_items, ESP_ERR_INVALID_ARG, TAG, "invalid number of items");
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size_t buffer_alignment = config->buffer_alignment;
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if (buffer_alignment == 0) {
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buffer_alignment = 1;
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}
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ESP_RETURN_ON_FALSE((buffer_alignment & (buffer_alignment - 1)) == 0, ESP_ERR_INVALID_ARG, TAG, "invalid buffer alignment: %zu", buffer_alignment);
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// the link list container is allocated from internal memory
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list = heap_caps_calloc(1, sizeof(gdma_link_list_t), MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
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ESP_GOTO_ON_FALSE(list, ESP_ERR_NO_MEM, err, TAG, "no mem for link list");
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uint32_t num_items = config->num_items;
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size_t item_alignment = config->item_alignment ? config->item_alignment : 4;
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// each list item should align to the specified alignment
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size_t item_size = ALIGN_UP(sizeof(gdma_link_list_item_t), item_alignment);
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uint32_t list_items_mem_caps = MALLOC_CAP_8BIT | MALLOC_CAP_DMA;
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if (config->flags.items_in_ext_mem) {
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list_items_mem_caps |= MALLOC_CAP_SPIRAM;
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} else {
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list_items_mem_caps |= MALLOC_CAP_INTERNAL;
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}
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items = heap_caps_aligned_calloc(item_alignment, num_items, item_size, list_items_mem_caps);
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ESP_GOTO_ON_FALSE(items, ESP_ERR_NO_MEM, err, TAG, "no mem for link list items");
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// do memory sync if the list items are in the cache
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uint32_t data_cache_line_size = 0;
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if (config->flags.items_in_ext_mem) {
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data_cache_line_size = cache_hal_get_cache_line_size(CACHE_LL_LEVEL_EXT_MEM, CACHE_TYPE_DATA);
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} else {
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data_cache_line_size = cache_hal_get_cache_line_size(CACHE_LL_LEVEL_INT_MEM, CACHE_TYPE_DATA);
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}
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if (data_cache_line_size) {
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// write back and then invalidate the cache, because later we will read/write the link list items by non-cached address
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ESP_GOTO_ON_ERROR(esp_cache_msync(items, ALIGN_UP(num_items * item_size, data_cache_line_size),
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ESP_CACHE_MSYNC_FLAG_DIR_C2M | ESP_CACHE_MSYNC_FLAG_INVALIDATE),
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err, TAG, "cache sync failed");
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}
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list->num_items = num_items;
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list->item_size = item_size;
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list->items = items;
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// calculate the non-cached address
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list->items_nc = GDMA_CACHE_ADDR_TO_NON_CACHE_ADDR(items);
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list->buffer_alignment = buffer_alignment;
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list->flags.check_owner = config->flags.check_owner;
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ESP_LOGD(TAG, "new link list @%p, items @%p", list, items);
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*ret_list = list;
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return ESP_OK;
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err:
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if (list) {
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free(list);
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}
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if (items) {
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free(items);
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}
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return ret;
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}
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esp_err_t gdma_del_link_list(gdma_link_list_handle_t list)
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{
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ESP_RETURN_ON_FALSE(list, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
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ESP_LOGD(TAG, "del link list at %p", list);
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free(list->items);
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free(list);
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return ESP_OK;
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}
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esp_err_t gdma_link_mount_buffers(gdma_link_list_handle_t list, uint32_t start_item_index, const gdma_buffer_mount_config_t *buf_config_array, size_t num_buf, uint32_t *end_item_index)
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{
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ESP_RETURN_ON_FALSE(list && buf_config_array && num_buf, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
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ESP_RETURN_ON_FALSE(start_item_index < list->num_items, ESP_ERR_INVALID_ARG, TAG, "invalid start item index");
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size_t buffer_alignment = list->buffer_alignment;
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size_t item_size = list->item_size;
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uint32_t list_item_capacity = list->num_items;
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size_t max_buffer_mount_length = ALIGN_DOWN(GDMA_MAX_BUFFER_SIZE_PER_LINK_ITEM, buffer_alignment);
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uint32_t begin_item_idx = start_item_index;
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gdma_link_list_item_t *lli_nc = NULL;
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uint32_t num_items_avail = 0;
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// if the link list is responsible for checking the ownership, we need to skip the items that are owned by the DMA
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if (list->flags.check_owner) {
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for (uint32_t i = 0; i < list_item_capacity; i++) {
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lli_nc = (gdma_link_list_item_t *)(list->items_nc + (i + start_item_index) % list_item_capacity * item_size);
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if (lli_nc->dw0.owner == GDMA_LLI_OWNER_CPU) {
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num_items_avail++;
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}
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}
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} else {
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num_items_avail = list_item_capacity;
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}
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// check alignment and length for each buffer
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for (size_t i = 0; i < num_buf; i++) {
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const gdma_buffer_mount_config_t *config = &buf_config_array[i];
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uint8_t *buf = (uint8_t *)config->buffer;
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size_t len = config->length;
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// check the buffer alignment
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ESP_RETURN_ON_FALSE(((uintptr_t)buf & (buffer_alignment - 1)) == 0, ESP_ERR_INVALID_ARG, TAG, "buffer not aligned to %zu", buffer_alignment);
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uint32_t num_items_need = (len + max_buffer_mount_length - 1) / max_buffer_mount_length;
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// check if there are enough link list items
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ESP_RETURN_ON_FALSE((begin_item_idx + num_items_need) <= (start_item_index + num_items_avail), ESP_ERR_INVALID_ARG, TAG, "no more space for buffer mounting");
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begin_item_idx += num_items_need;
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}
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// link_nodes[start_item_index-1] --> link_nodes[start_item_index]
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lli_nc = (gdma_link_list_item_t *)(list->items_nc + (start_item_index + list_item_capacity - 1) % list_item_capacity * item_size);
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lli_nc->next = (gdma_link_list_item_t *)(list->items + start_item_index * item_size);
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begin_item_idx = start_item_index;
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for (size_t i = 0; i < num_buf; i++) {
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const gdma_buffer_mount_config_t *config = &buf_config_array[i];
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uint8_t *buf = (uint8_t *)config->buffer;
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size_t len = config->length;
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// skip zero-length buffer
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if (len == 0 || buf == NULL) {
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continue;
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}
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uint32_t num_items_need = (len + max_buffer_mount_length - 1) / max_buffer_mount_length;
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// mount the buffer to the link list
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for (uint32_t i = 0; i < num_items_need; i++) {
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lli_nc = (gdma_link_list_item_t *)(list->items_nc + (i + begin_item_idx) % list_item_capacity * item_size);
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lli_nc->buffer = buf;
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lli_nc->dw0.length = len > max_buffer_mount_length ? max_buffer_mount_length : len;
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// in fact the DMA doesn't check the "size" field, but we still set it to "length" for consistency
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// it's the user's responsibility to make sure the buffer size is sufficient
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lli_nc->dw0.size = lli_nc->dw0.length;
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// mark the EOF node
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lli_nc->dw0.suc_eof = (config->flags.mark_eof == 1) && (i == num_items_need - 1);
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// mark the final node
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if ((config->flags.mark_final == 1) && (i == num_items_need - 1)) {
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lli_nc->next = NULL;
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} else {
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lli_nc->next = (gdma_link_list_item_t *)(list->items + (i + begin_item_idx + 1) % list_item_capacity * item_size);
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}
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lli_nc->dw0.owner = GDMA_LLI_OWNER_DMA;
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buf += max_buffer_mount_length;
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len -= max_buffer_mount_length;
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}
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begin_item_idx += num_items_need;
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}
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// return the index of the last modified list item
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if (end_item_index) {
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*end_item_index = (begin_item_idx - 1 + list_item_capacity) % list_item_capacity;
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}
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return ESP_OK;
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}
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uintptr_t gdma_link_get_head_addr(gdma_link_list_handle_t list)
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{
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ESP_RETURN_ON_FALSE(list, 0, TAG, "invalid argument");
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return (uintptr_t)(list->items);
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}
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esp_err_t gdma_link_set_owner(gdma_link_list_handle_t list, int item_index, gdma_lli_owner_t owner)
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{
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ESP_RETURN_ON_FALSE_ISR(list, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
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ESP_RETURN_ON_FALSE_ISR(item_index < list->num_items, ESP_ERR_INVALID_ARG, TAG, "invalid item index");
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gdma_link_list_item_t *lli = (gdma_link_list_item_t *)(list->items_nc + item_index * list->item_size);
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lli->dw0.owner = owner;
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return ESP_OK;
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}
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esp_err_t gdma_link_get_owner(gdma_link_list_handle_t list, int item_index, gdma_lli_owner_t *owner)
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{
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ESP_RETURN_ON_FALSE_ISR(list && owner, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
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ESP_RETURN_ON_FALSE_ISR(item_index < list->num_items, ESP_ERR_INVALID_ARG, TAG, "invalid item index");
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gdma_link_list_item_t *lli = (gdma_link_list_item_t *)(list->items_nc + item_index * list->item_size);
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*owner = lli->dw0.owner;
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return ESP_OK;
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}
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@@ -361,7 +361,7 @@ dw_gdma_lli_handle_t dw_gdma_link_list_get_item(dw_gdma_link_list_handle_t list,
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* - ESP_ERR_INVALID_ARG: Configure link list item block transfer failed because of invalid argument
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* - ESP_FAIL: Configure link list item block transfer failed because of other error
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*/
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esp_err_t dw_gdma_lli_config_transfer(dw_gdma_lli_handle_t lli, dw_gdma_block_transfer_config_t *config);
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esp_err_t dw_gdma_lli_config_transfer(dw_gdma_lli_handle_t lli, const dw_gdma_block_transfer_config_t *config);
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/**
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* @brief Set the next link list item for a given DMA link list item
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@@ -0,0 +1,144 @@
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/*
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* SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include <stdbool.h>
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#include "esp_err.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Type of GDMA link list handle
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*/
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typedef struct gdma_link_list_t *gdma_link_list_handle_t;
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/**
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* @brief DMA link list configurations
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*/
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typedef struct {
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uint32_t num_items; //!< Number of nodes in the link list
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size_t item_alignment; //!< Alignment of each list item required by the DMA. By default, it's 4 bytes alignment.
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size_t buffer_alignment; //!< Alignment of each buffer required by the DMA. By default, it's 1 byte alignment.
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struct gdma_link_list_flags {
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uint32_t items_in_ext_mem: 1; //!< Whether the link list items are allocated from external memory
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uint32_t check_owner: 1; //!< Whether the link list is responsible for checking the ownership when mount data buffers
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} flags;
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} gdma_link_list_config_t;
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/**
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* @brief Create a DMA link list
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*
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* @note This function will allocate memory for the link list.
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*
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* @param[in] config Link list configurations
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* @param[out] ret_list Returned link list handle
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* @return
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* - ESP_OK: Create DMA link list successfully
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* - ESP_ERR_INVALID_ARG: Create DMA link list failed because of invalid argument
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* - ESP_ERR_NO_MEM: Create DMA link list failed because out of memory
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* - ESP_FAIL: Create DMA link list failed because of other error
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*/
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esp_err_t gdma_new_link_list(const gdma_link_list_config_t *config, gdma_link_list_handle_t *ret_list);
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/**
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* @brief Delete a DMA link list
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*
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* @param[in] list Link list handle, allocated by `gdma_new_link_list`
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* @return
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* - ESP_OK: Delete DMA link list successfully
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* - ESP_ERR_INVALID_ARG: Delete DMA link list failed because of invalid argument
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* - ESP_FAIL: Delete DMA link list failed because of other error
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*/
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esp_err_t gdma_del_link_list(gdma_link_list_handle_t list);
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/**
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* @brief DMA buffer mount configurations
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*/
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typedef struct {
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void *buffer; //!< Buffer to be mounted to the DMA link list
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size_t length; //!< Number of bytes that are expected to be transferred
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struct gdma_buffer_mount_flags {
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uint32_t mark_eof: 1; /*!< Whether to mark the list item as the "EOF" item.
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Note, an "EOF" descriptor can be interrupted differently by peripheral.
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But it doesn't mean to terminate a DMA link (use `mark_final` instead).
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EOF link list item can also trigger an interrupt. */
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uint32_t mark_final: 1; /*!< Whether to terminate the DMA link list at this item.
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Note, DMA engine will stop at this item and trigger an interrupt.
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If `mark_final` is not set, this list item will point to the next item, and
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wrap around to the head item if it's the one in the list. */
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} flags; //!< Flags for buffer mount configurations
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} gdma_buffer_mount_config_t;
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/**
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* @brief Mount one or more buffers to a given link list
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*
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* @note Different buffers won't be mounted to the same DMA link list item
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* @note After mount to the last list item, the next list item will be the head item (wrap around)
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*
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* @param[in] list Link list handle, allocated by `gdma_new_link_list`
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* @param[in] start_item_index Index of the first item in the link list to be mounted
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* @param[in] buf_config_array Array of buffer mount configurations
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* @param[in] num_buf Number of buffers to be mounted
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* @param[out] end_item_index Index of the last item in the link list that has been mounted
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* @return
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* - ESP_OK: Mount the buffer successfully
|
||||
* - ESP_ERR_INVALID_ARG: Mount the buffer failed because of invalid argument
|
||||
* - ESP_FAIL: Mount the buffer failed because of other error
|
||||
*/
|
||||
esp_err_t gdma_link_mount_buffers(gdma_link_list_handle_t list, uint32_t start_item_index, const gdma_buffer_mount_config_t *buf_config_array, size_t num_buf, uint32_t *end_item_index);
|
||||
|
||||
/**
|
||||
* @brief Get the address of the head item in the link list
|
||||
*
|
||||
* @note The head address can be used to start a DMA transfer
|
||||
*
|
||||
* @param[in] list Link list handle, allocated by `gdma_new_link_list`
|
||||
* @return
|
||||
* - Address of the head item in the link list
|
||||
* - NULL: Get the address failed
|
||||
*/
|
||||
uintptr_t gdma_link_get_head_addr(gdma_link_list_handle_t list);
|
||||
|
||||
/**
|
||||
* @brief GDMA link list item owner
|
||||
*/
|
||||
typedef enum {
|
||||
GDMA_LLI_OWNER_CPU = 0, /*!< GDMA link list item is only allowed to be accessed by CPU */
|
||||
GDMA_LLI_OWNER_DMA = 1, /*!< GDMA link list item is only allowed to be accessed by DMA */
|
||||
} gdma_lli_owner_t;
|
||||
|
||||
/**
|
||||
* @brief Set the ownership for a DMA link list item
|
||||
*
|
||||
* @param[in] list Link list handle, allocated by `gdma_new_link_list`
|
||||
* @param[in] item_index Index of the link list item
|
||||
* @param[in] owner Ownership
|
||||
* @return
|
||||
* - ESP_OK: Set the ownership successfully
|
||||
* - ESP_ERR_INVALID_ARG: Set the ownership failed because of invalid argument
|
||||
* - ESP_FAIL: Set the ownership failed because of other error
|
||||
*/
|
||||
esp_err_t gdma_link_set_owner(gdma_link_list_handle_t list, int item_index, gdma_lli_owner_t owner);
|
||||
|
||||
/**
|
||||
* @brief Get the ownership of a DMA link list item
|
||||
*
|
||||
* @param[in] list Link list handle, allocated by `gdma_new_link_list`
|
||||
* @param[in] item_index Index of the link list item
|
||||
* @param[out] owner Ownership
|
||||
* @return
|
||||
* - ESP_OK: Get the ownership successfully
|
||||
* - ESP_ERR_INVALID_ARG: Get the ownership failed because of invalid argument
|
||||
* - ESP_FAIL: Get the ownership failed because of other error
|
||||
*/
|
||||
esp_err_t gdma_link_get_owner(gdma_link_list_handle_t list, int item_index, gdma_lli_owner_t *owner);
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
Reference in New Issue
Block a user