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spiram: expose function to initialize SPI RAM cache

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Some frameworks based on ESP-IDF need to be able to decide whether to
initialize SPI RAM after the application has started. This change splits
out part of esp_spiram_init which manipulate cache MMU into a separate
function. Applications can disable cache, call esp_spiram_init_cache,
re-enable cache, and then call esp_spiram_init.
Disabling and re-enabling the cache can be achieved using functions
provided in esp_spi_flash.h.
This commit is contained in:
Ivan Grokhotkov 2017-09-18 23:02:33 +08:00
parent 3a271a4ae7
commit 1da3204a7c
3 changed files with 19 additions and 5 deletions
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1
components/esp32/cpu_start.c
View file

@ -150,6 +150,7 @@ void IRAM_ATTR call_start_cpu0()
}
#if CONFIG_SPIRAM_BOOT_INIT
esp_spiram_init_cache();
if (esp_spiram_init() != ESP_OK) {
ESP_EARLY_LOGE(TAG, "Failed to init external RAM!");
abort();

11
components/esp32/include/esp_spiram.h
View file

@ -27,6 +27,17 @@
*/
esp_err_t esp_spiram_init();
/**
* @brief Configure Cache/MMU for access to external SPI RAM.
*
* Normally this function is called from cpu_start, if CONFIG_SPIRAM_BOOT_INIT
* option is enabled. Applications which need to enable SPI RAM at run time
* can disable CONFIG_SPIRAM_BOOT_INIT, and call this function later.
*
* @attention this function must be called with flash cache disabled.
*/
void esp_spiram_init_cache();
/**
* @brief Memory test for SPI RAM. Should be called after SPI RAM is initialized and

8
components/esp32/spiram.c
View file

@ -91,9 +91,7 @@ bool esp_spiram_test()
}
}
esp_err_t esp_spiram_init()
void IRAM_ATTR esp_spiram_init_cache()
{
//Enable external RAM in MMU
cache_sram_mmu_set( 0, 0, SOC_EXTRAM_DATA_LOW, 0, 32, 128 );
@ -102,7 +100,11 @@ esp_err_t esp_spiram_init()
DPORT_CLEAR_PERI_REG_MASK(DPORT_APP_CACHE_CTRL1_REG, DPORT_APP_CACHE_MASK_DRAM1);
cache_sram_mmu_set( 1, 0, SOC_EXTRAM_DATA_LOW, 0, 32, 128 );
#endif
}
esp_err_t esp_spiram_init()
{
esp_err_t r;
r = psram_enable(PSRAM_SPEED, PSRAM_MODE);
if (r != ESP_OK) {