diff options
Diffstat (limited to 'stm/storage.c')
| -rw-r--r-- | stm/storage.c | 176 |
1 files changed, 0 insertions, 176 deletions
diff --git a/stm/storage.c b/stm/storage.c deleted file mode 100644 index 8eed6dfcd8..0000000000 --- a/stm/storage.c +++ /dev/null @@ -1,176 +0,0 @@ -#include <stdint.h> -#include "std.h" - -#include "misc.h" -#include "systick.h" -#include "mpconfig.h" -#include "qstr.h" -#include "obj.h" -#include "led.h" -#include "flash.h" -#include "storage.h" - -#define CACHE_MEM_START_ADDR (0x10000000) // CCM data RAM, 64k -#define FLASH_PART1_START_BLOCK (0x100) -#define FLASH_PART1_NUM_BLOCKS (224) // 16k+16k+16k+64k=112k -#define FLASH_MEM_START_ADDR (0x08004000) // sector 1, 16k - -static bool flash_is_initialised = false; -static bool flash_cache_dirty; -static uint32_t flash_cache_sector_id; -static uint32_t flash_cache_sector_start; -static uint32_t flash_cache_sector_size; -static uint32_t flash_sys_tick_counter_last_write; - -static void flash_cache_flush(void) { - if (flash_cache_dirty) { - // sync the cache RAM buffer by writing it to the flash page - flash_write(flash_cache_sector_start, (const uint32_t*)CACHE_MEM_START_ADDR, flash_cache_sector_size / 4); - flash_cache_dirty = false; - // indicate a clean cache with LED off - led_state(PYB_LED_R1, 0); - } -} - -static uint8_t *flash_cache_get_addr_for_write(uint32_t flash_addr) { - uint32_t flash_sector_start; - uint32_t flash_sector_size; - uint32_t flash_sector_id = flash_get_sector_info(flash_addr, &flash_sector_start, &flash_sector_size); - if (flash_cache_sector_id != flash_sector_id) { - flash_cache_flush(); - memcpy((void*)CACHE_MEM_START_ADDR, (const void*)flash_sector_start, flash_sector_size); - flash_cache_sector_id = flash_sector_id; - flash_cache_sector_start = flash_sector_start; - flash_cache_sector_size = flash_sector_size; - } - flash_cache_dirty = true; - // indicate a dirty cache with LED on - led_state(PYB_LED_R1, 1); - return (uint8_t*)CACHE_MEM_START_ADDR + flash_addr - flash_sector_start; -} - -static uint8_t *flash_cache_get_addr_for_read(uint32_t flash_addr) { - uint32_t flash_sector_start; - uint32_t flash_sector_size; - uint32_t flash_sector_id = flash_get_sector_info(flash_addr, &flash_sector_start, &flash_sector_size); - if (flash_cache_sector_id == flash_sector_id) { - // in cache, copy from there - return (uint8_t*)CACHE_MEM_START_ADDR + flash_addr - flash_sector_start; - } - // not in cache, copy straight from flash - return (uint8_t*)flash_addr; -} - -void storage_init(void) { - if (!flash_is_initialised) { - flash_cache_dirty = false; - flash_cache_sector_id = 0; - flash_is_initialised = true; - flash_sys_tick_counter_last_write = 0; - } -} - -uint32_t storage_get_block_size(void) { - return FLASH_BLOCK_SIZE; -} - -uint32_t storage_get_block_count(void) { - return FLASH_PART1_START_BLOCK + FLASH_PART1_NUM_BLOCKS; -} - -bool storage_needs_flush(void) { - // wait 2 seconds after last write to flush - return flash_cache_dirty && sys_tick_has_passed(flash_sys_tick_counter_last_write, 2000); -} - -void storage_flush(void) { - flash_cache_flush(); -} - -static void build_partition(uint8_t *buf, int boot, int type, uint32_t start_block, uint32_t num_blocks) { - buf[0] = boot; - - if (num_blocks == 0) { - buf[1] = 0; - buf[2] = 0; - buf[3] = 0; - } else { - buf[1] = 0xff; - buf[2] = 0xff; - buf[3] = 0xff; - } - - buf[4] = type; - - if (num_blocks == 0) { - buf[5] = 0; - buf[6] = 0; - buf[7] = 0; - } else { - buf[5] = 0xff; - buf[6] = 0xff; - buf[7] = 0xff; - } - - buf[8] = start_block; - buf[9] = start_block >> 8; - buf[10] = start_block >> 16; - buf[11] = start_block >> 24; - - buf[12] = num_blocks; - buf[13] = num_blocks >> 8; - buf[14] = num_blocks >> 16; - buf[15] = num_blocks >> 24; -} - -bool storage_read_block(uint8_t *dest, uint32_t block) { - //printf("RD %u\n", block); - if (block == 0) { - // fake the MBR so we can decide on our own partition table - - for (int i = 0; i < 446; i++) { - dest[i] = 0; - } - - build_partition(dest + 446, 0, 0x01 /* FAT12 */, FLASH_PART1_START_BLOCK, FLASH_PART1_NUM_BLOCKS); - build_partition(dest + 462, 0, 0, 0, 0); - build_partition(dest + 478, 0, 0, 0, 0); - build_partition(dest + 494, 0, 0, 0, 0); - - dest[510] = 0x55; - dest[511] = 0xaa; - - return true; - - } else if (FLASH_PART1_START_BLOCK <= block && block < FLASH_PART1_START_BLOCK + FLASH_PART1_NUM_BLOCKS) { - // non-MBR block, get data from flash memory, possibly via cache - uint32_t flash_addr = FLASH_MEM_START_ADDR + (block - FLASH_PART1_START_BLOCK) * FLASH_BLOCK_SIZE; - uint8_t *src = flash_cache_get_addr_for_read(flash_addr); - memcpy(dest, src, FLASH_BLOCK_SIZE); - return true; - - } else { - // bad block number - return false; - } -} - -bool storage_write_block(const uint8_t *src, uint32_t block) { - //printf("WR %u\n", block); - if (block == 0) { - // can't write MBR, but pretend we did - return true; - - } else if (FLASH_PART1_START_BLOCK <= block && block < FLASH_PART1_START_BLOCK + FLASH_PART1_NUM_BLOCKS) { - // non-MBR block, copy to cache - uint32_t flash_addr = FLASH_MEM_START_ADDR + (block - FLASH_PART1_START_BLOCK) * FLASH_BLOCK_SIZE; - uint8_t *dest = flash_cache_get_addr_for_write(flash_addr); - memcpy(dest, src, FLASH_BLOCK_SIZE); - flash_sys_tick_counter_last_write = sys_tick_counter; - return true; - - } else { - // bad block number - return false; - } -} |