esp-idf/components/hal/esp32c3/rtc_cntl_hal.c

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// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// The HAL layer for RTC CNTL (common part)
#include "hal/rtc_hal.h"
#include "soc/soc_caps.h"
#include "esp32c3/rom/lldesc.h"
#include "esp_attr.h"
#define RTC_CNTL_HAL_LINK_BUF_SIZE_MIN (RTC_CNTL_CPU_PD_DMA_BLOCK_SIZE) /* The minimum size of dma link buffer */
typedef struct rtc_cntl_link_buf_conf {
uint32_t cfg[4]; /* 4 word for dma link buffer configuration */
} rtc_cntl_link_buf_conf_t;
void * rtc_cntl_hal_dma_link_init(void *elem, void *buff, int size, void *next)
{
assert(elem != NULL);
assert(buff != NULL);
assert(size >= RTC_CNTL_HAL_LINK_BUF_SIZE_MIN);
lldesc_t *plink = (lldesc_t *)elem;
plink->eof = next ? 0 : 1;
plink->owner = 1;
plink->size = size >> 4; /* in unit of 16 bytes */
plink->length = size >> 4;
plink->buf = buff;
plink->offset = 0;
plink->sosf = 0;
STAILQ_NEXT(plink, qe) = next;
return (void *)plink;
}
void rtc_cntl_hal_enable_cpu_retention(void *addr)
{
if (addr) {
lldesc_t *plink = (lldesc_t *)addr;
/* dma link buffer configure */
rtc_cntl_link_buf_conf_t *pbuf = (rtc_cntl_link_buf_conf_t *)plink->buf;
pbuf->cfg[0] = 0;
pbuf->cfg[1] = 0;
pbuf->cfg[2] = 0;
pbuf->cfg[3] = (uint32_t)-1;
rtc_cntl_ll_enable_cpu_retention((uint32_t)addr);
}
}