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spi_flash: partially move API functions out of IRAM

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This commit is contained in:
Michael (XIAO Xufeng) 2022-03-04 17:35:00 +08:00
parent c5dfaec6b3
commit 61989e0fbb
1 changed files with 58 additions and 27 deletions
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85
components/spi_flash/esp_flash_api.c
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@ -503,7 +503,27 @@ esp_err_t IRAM_ATTR esp_flash_set_protected_region(esp_flash_t *chip, const esp_
return spiflash_end(chip, err);
}
esp_err_t IRAM_ATTR esp_flash_read(esp_flash_t *chip, void *buffer, uint32_t address, uint32_t length)
static esp_err_t NOINLINE_ATTR IRAM_ATTR flash_read_core(esp_flash_t *chip, void* buffer_to_read, uint32_t address, uint32_t length_to_read, bool *out_read_success)
{
esp_err_t err = ESP_OK;
bool read_success = false;
read_success = false;
err = spiflash_start(chip);
if (err == ESP_OK) {
err = chip->chip_drv->read(chip, buffer_to_read, address, length_to_read);
}
if (err == ESP_OK) {
read_success = true;
}
err = spiflash_end(chip, err);
*out_read_success = read_success;
return err;
}
esp_err_t esp_flash_read(esp_flash_t *chip, void *buffer, uint32_t address, uint32_t length)
{
if (length == 0) {
return ESP_OK;
@ -544,28 +564,17 @@ esp_err_t IRAM_ATTR esp_flash_read(esp_flash_t *chip, void *buffer, uint32_t add
esp_err_t err = ESP_OK;
do {
err = spiflash_start(chip);
if (err != ESP_OK) {
break;
}
//if required (dma buffer allocated), read to the buffer instead of the original buffer
uint8_t* buffer_to_read = (temp_buffer)? temp_buffer : buffer;
// Length we will read this iteration is either the chunk size or the remaining length, whichever is smaller
size_t length_to_read = MIN(read_chunk_size, length);
if (err == ESP_OK) {
err = chip->chip_drv->read(chip, buffer_to_read, address, length_to_read);
}
if (err != ESP_OK) {
spiflash_end(chip, err);
break;
}
//even if this is failed, the data is still valid, copy before quit
err = spiflash_end(chip, err);
bool read_success;
err = flash_read_core(chip, buffer_to_read, address, length_to_read, &read_success);
//copy back to the original buffer
if (temp_buffer) {
if (read_success && temp_buffer) {
memcpy(buffer, temp_buffer, length_to_read);
}
address += length_to_read;
@ -577,7 +586,28 @@ esp_err_t IRAM_ATTR esp_flash_read(esp_flash_t *chip, void *buffer, uint32_t add
return err;
}
esp_err_t IRAM_ATTR esp_flash_write(esp_flash_t *chip, const void *buffer, uint32_t address, uint32_t length)
// This function disable the cache, but when returning from this function, the cache should be enabled.
static esp_err_t IRAM_ATTR NOINLINE_ATTR flash_write_core(esp_flash_t *chip,
const void* write_buf, uint32_t write_addr, uint32_t write_len,
uint32_t address, uint32_t length, bool final)
{
bool bus_acquire = false; //controls whether the flash_end_flush_cache() needs to disable the cache again.
esp_err_t err = spiflash_start(chip);
if (err == ESP_OK) {
bus_acquire = true;
err = chip->chip_drv->write(chip, write_buf, write_addr, write_len);
}
if (bus_acquire) {
//on IDF v4.1, the flush is done in chip driver layer. Call spiflash_end() here.
err = spiflash_end(chip, err);
}
return err;
}
esp_err_t esp_flash_write(esp_flash_t *chip, const void *buffer, uint32_t address, uint32_t length)
{
if (length == 0) {
return ESP_OK;
@ -596,31 +626,32 @@ esp_err_t IRAM_ATTR esp_flash_write(esp_flash_t *chip, const void *buffer, uint3
by artificially cutting into MAX_WRITE_CHUNK parts (in an OS
environment, this prevents writing from causing interrupt or higher priority task
starvation.) */
uint32_t write_addr = address;
uint32_t len_remain = length;
do {
uint32_t write_len;
const void *write_buf;
uint32_t temp_buf[8];
if (direct_write) {
write_len = MIN(length, MAX_WRITE_CHUNK);
write_len = MIN(len_remain, MAX_WRITE_CHUNK);
write_buf = buffer;
} else {
write_len = MIN(length, sizeof(temp_buf));
write_len = MIN(len_remain, sizeof(temp_buf));
memcpy(temp_buf, buffer, write_len);
write_buf = temp_buf;
}
err = spiflash_start(chip);
if (err != ESP_OK) {
return err;
bool final = (len_remain == write_len);
//This function ensures cache enabled when returned
err = flash_write_core(chip, write_buf, write_addr, write_len, address, length, final);
if (err != ESP_OK || final) {
break;
}
err = chip->chip_drv->write(chip, write_buf, address, write_len);
address += write_len;
len_remain -= write_len;
assert(len_remain < length);
write_addr += write_len;
buffer = (void *)((intptr_t)buffer + write_len);
length -= write_len;
err = spiflash_end(chip, err);
} while (err == ESP_OK && length > 0);
return err;
}