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Reverse engineered some spi_flash functions

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This commit is contained in:
sheinz 2016-06-29 00:47:14 +03:00
parent ab795350fb
commit 33b63d46a5
1 changed files with 149 additions and 8 deletions
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157
extras/spiffs/esp_spiffs.c
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@ -9,6 +9,9 @@
#include "spiffs.h"
#include <espressif/spi_flash.h>
#include <stdbool.h>
#include "common_macros.h"
#include "FreeRTOS.h"
#include "esp/rom.h"
spiffs fs;
@ -16,6 +19,144 @@ static void *work_buf = 0;
static void *fds_buf = 0;
static void *cache_buf = 0;
// ROM functions
uint32_t SPI_read_data(sdk_flashchip_t *p, uint32_t dest_addr, void *src,
uint32_t size);
uint32_t SPI_page_program(sdk_flashchip_t *p, uint32_t dest_addr, void *dst,
uint32_t size);
uint32_t SPI_write_enable(sdk_flashchip_t *p);
uint32_t SPI_sector_erase(sdk_flashchip_t *p, uint32_t sector_addr);
/**
* Reverse engineered implementation of spi_flash.o:sdk_SPIRead
*/
uint32_t IRAM spi_read(uint32_t dest_addr, void *src, uint32_t size)
{
if (SPI_read_data(&sdk_flashchip, dest_addr, src, size)) {
return 1;
} else {
return 0;
}
}
/**
* Reverse engineered implementation of spi_flash.o:sdk_spi_flash_read
*/
uint32_t IRAM spi_flash_read(uint32_t dest_addr, void *src, uint32_t size)
{
if (src) {
vPortEnterCritical();
Cache_Read_Disable();
uint32_t result = spi_read(dest_addr, src, size);
Cache_Read_Enable(0, 0, 1);
vPortExitCritical();
return result;
} else {
return 1;
}
}
/**
* Reverse engineered implementation of spi_flash.o:sdk_SPIWrite
*/
uint32_t IRAM spi_write(uint32_t dest_addr, void *dst, uint32_t size)
{
if (sdk_flashchip.chip_size < (dest_addr + size)) {
return 1;
}
uint32_t write_bytes_to_page = sdk_flashchip.page_size -
(dest_addr % sdk_flashchip.page_size);
if (size < write_bytes_to_page) {
if (SPI_page_program(&sdk_flashchip, dest_addr, dst, size)) {
return 1;
} else {
return 0;
}
}
if (SPI_page_program(&sdk_flashchip, dest_addr, dst, write_bytes_to_page)) {
return 1;
}
uint32_t offset = write_bytes_to_page;
uint32_t pages_to_write = (size - offset) / sdk_flashchip.page_size;
for (uint8_t i = 0; i != pages_to_write; i++) {
if (SPI_page_program(&sdk_flashchip, dest_addr + offset,
dst + ((offset>>2)<<2), sdk_flashchip.page_size)) {
return 1;
}
offset += sdk_flashchip.page_size;
}
if (SPI_page_program(&sdk_flashchip, dest_addr + offset,
dst + ((offset>>2)<<2), size - offset)) {
return 1;
} else {
return 0;
}
}
/**
* Reverse engineered implementation of spi_flash.o:sdk_spi_flash_write
*/
uint32_t IRAM spi_flash_write(uint32_t dest_addr, void *dst, uint32_t size)
{
if (dst) {
if (size & 0b11) { // not 4-byte aligned
size = size >> 2;
size = (size << 2) + 1;
}
vPortEnterCritical();
Cache_Read_Disable();
uint32_t result = spi_write(dest_addr, dst, size);
Cache_Read_Enable(0, 0, 1);
vPortExitCritical();
return result;
} else {
return 1;
}
}
/**
* Reverse engineered implementation of spi_flash.o:sdk_SPIEraseSector
*/
uint32_t IRAM spi_erase_sector(uint32_t sector)
{
if (sector >= (sdk_flashchip.chip_size / sdk_flashchip.sector_size)) {
return 1;
}
if (SPI_write_enable(&sdk_flashchip)) {
return 1;
}
if (SPI_sector_erase(&sdk_flashchip, sdk_flashchip.sector_size * sector)) {
return 1;
}
return 0;
}
/**
* Reverse engineered implementation of spi_flash.o:sdk_spi_flash_erase_sector
*/
uint32_t IRAM spi_flash_erase_sector(uint32_t sector)
{
vPortEnterCritical();
Cache_Read_Disable();
uint32_t result = spi_erase_sector(sector);
Cache_Read_Enable(0, 0, 1);
vPortExitCritical();
return result;
}
/*
* Flash addresses and size alignment is a rip-off of Arduino implementation.
*/
@ -32,7 +173,7 @@ static s32_t esp_spiffs_read(u32_t addr, u32_t size, u8_t *dst)
if (addr < alignedBegin) {
uint32_t nb = alignedBegin - addr;
uint32_t tmp;
if (sdk_spi_flash_read(alignedEnd - 4, &tmp, 4) != SPI_FLASH_RESULT_OK) {
if (spi_flash_read(alignedEnd - 4, &tmp, 4) != SPI_FLASH_RESULT_OK) {
printf("spi_flash_read failed\n");
return SPIFFS_ERR_INTERNAL;
}
@ -40,7 +181,7 @@ static s32_t esp_spiffs_read(u32_t addr, u32_t size, u8_t *dst)
}
if (alignedEnd != alignedBegin) {
if (sdk_spi_flash_read(alignedBegin,
if (spi_flash_read(alignedBegin,
(uint32_t*) (dst + alignedBegin - addr),
alignedEnd - alignedBegin) != SPI_FLASH_RESULT_OK) {
printf("spi_flash_read failed\n");
@ -51,7 +192,7 @@ static s32_t esp_spiffs_read(u32_t addr, u32_t size, u8_t *dst)
if (addr + size > alignedEnd) {
uint32_t nb = addr + size - alignedEnd;
uint32_t tmp;
if (sdk_spi_flash_read(alignedEnd, &tmp, 4) != SPI_FLASH_RESULT_OK) {
if (spi_flash_read(alignedEnd, &tmp, 4) != SPI_FLASH_RESULT_OK) {
printf("spi_flash_read failed\n");
return SPIFFS_ERR_INTERNAL;
}
@ -77,7 +218,7 @@ static s32_t esp_spiffs_write(u32_t addr, u32_t size, u8_t *src)
uint32_t nb = (size < ofs) ? size : ofs;
uint8_t tmp[4] __attribute__((aligned(4))) = {0xff, 0xff, 0xff, 0xff};
memcpy(tmp + 4 - ofs, src, nb);
if (sdk_spi_flash_write(alignedBegin - 4, (uint32_t*) tmp, 4)
if (spi_flash_write(alignedBegin - 4, (uint32_t*) tmp, 4)
!= SPI_FLASH_RESULT_OK) {
printf("spi_flash_write failed\n");
return SPIFFS_ERR_INTERNAL;
@ -88,7 +229,7 @@ static s32_t esp_spiffs_write(u32_t addr, u32_t size, u8_t *src)
uint32_t* srcLeftover = (uint32_t*) (src + alignedBegin - addr);
uint32_t srcAlign = ((uint32_t) srcLeftover) & 3;
if (!srcAlign) {
if (sdk_spi_flash_write(alignedBegin, (uint32_t*) srcLeftover,
if (spi_flash_write(alignedBegin, (uint32_t*) srcLeftover,
alignedEnd - alignedBegin) != SPI_FLASH_RESULT_OK) {
printf("spi_flash_write failed\n");
return SPIFFS_ERR_INTERNAL;
@ -100,7 +241,7 @@ static s32_t esp_spiffs_write(u32_t addr, u32_t size, u8_t *src)
size_t willCopy = sizeLeft < sizeof(buf) ? sizeLeft : sizeof(buf);
memcpy(buf, srcLeftover, willCopy);
if (sdk_spi_flash_write(alignedBegin, (uint32_t*) buf, willCopy)
if (spi_flash_write(alignedBegin, (uint32_t*) buf, willCopy)
!= SPI_FLASH_RESULT_OK) {
printf("spi_flash_write failed\n");
return SPIFFS_ERR_INTERNAL;
@ -118,7 +259,7 @@ static s32_t esp_spiffs_write(u32_t addr, u32_t size, u8_t *src)
uint32_t tmp = 0xffffffff;
memcpy(&tmp, src + size - nb, nb);
if (sdk_spi_flash_write(alignedEnd, &tmp, 4) != SPI_FLASH_RESULT_OK) {
if (spi_flash_write(alignedEnd, &tmp, 4) != SPI_FLASH_RESULT_OK) {
printf("spi_flash_write failed\n");
return SPIFFS_ERR_INTERNAL;
}
@ -140,7 +281,7 @@ static s32_t esp_spiffs_erase(u32_t addr, u32_t size)
const uint32_t sectorCount = size / SPI_FLASH_SEC_SIZE;
for (uint32_t i = 0; i < sectorCount; ++i) {
sdk_spi_flash_erase_sector(sector + i);
spi_flash_erase_sector(sector + i);
}
return SPIFFS_OK;
}