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52e3f09b32
Common spi functionality for sharing the SPI bus between modules is moved from esp_driver_spi to a more fitting location in esp_hw_support (shared HW resource control). This also allows us to decouple the spi_flash driver from esp_driver_spi, removing esp_driver_spi and esp_ringbuf from G1 builds.
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/*
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* SPDX-FileCopyrightText: 2023 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 "esp_private/spi_share_hw_ctrl.h"
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#include <stdatomic.h>
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#include "sdkconfig.h"
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#include "soc/soc_caps.h"
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#include "hal/spi_ll.h"
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#include "esp_log.h"
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static const char* SPI_TAG = "spi_share_hw_ctrl";
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//Periph 1 is 'claimed' by SPI flash code.
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static atomic_bool spi_periph_claimed[SOC_SPI_PERIPH_NUM] = { ATOMIC_VAR_INIT(true), ATOMIC_VAR_INIT(false),
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#if (SOC_SPI_PERIPH_NUM >= 3)
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ATOMIC_VAR_INIT(false),
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#endif
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#if (SOC_SPI_PERIPH_NUM >= 4)
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ATOMIC_VAR_INIT(false),
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#endif
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};
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static const char* spi_claiming_func[3] = {NULL, NULL, NULL};
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//----------------------------------------------------------alloc spi periph-------------------------------------------------------//
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//Returns true if this peripheral is successfully claimed, false if otherwise.
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bool spicommon_periph_claim(spi_host_device_t host, const char* source)
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{
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bool false_var = false;
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bool ret = atomic_compare_exchange_strong(&spi_periph_claimed[host], &false_var, true);
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if (ret) {
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spi_claiming_func[host] = source;
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SPI_COMMON_RCC_CLOCK_ATOMIC() {
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spi_ll_enable_bus_clock(host, true);
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spi_ll_reset_register(host);
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}
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} else {
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ESP_EARLY_LOGE(SPI_TAG, "SPI%d already claimed by %s.", host + 1, spi_claiming_func[host]);
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}
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return ret;
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}
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bool spicommon_periph_in_use(spi_host_device_t host)
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{
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return atomic_load(&spi_periph_claimed[host]);
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}
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//Returns true if this peripheral is successfully freed, false if otherwise.
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bool spicommon_periph_free(spi_host_device_t host)
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{
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bool true_var = true;
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bool ret = atomic_compare_exchange_strong(&spi_periph_claimed[host], &true_var, false);
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if (ret) {
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SPI_COMMON_RCC_CLOCK_ATOMIC() {
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spi_ll_enable_bus_clock(host, false);
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}
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}
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return ret;
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}
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