69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
#include <sys/types.h>
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#include <lib_AT91SAM7.h>
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#include <AT91SAM7.h>
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#include <dfu/dbgu.h>
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#include <board.h>
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#define EFCS_CMD_WRITE_PAGE 0x1
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#define EFCS_CMD_SET_LOCK_BIT 0x2
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#define EFCS_CMD_WRITE_PAGE_LOCK 0x3
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#define EFCS_CMD_CLEAR_LOCK 0x4
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#define EFCS_CMD_ERASE_ALL 0x8
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#define EFCS_CMD_SET_NVM_BIT 0xb
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#define EFCS_CMD_CLEAR_NVM_BIT 0xd
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#define EFCS_CMD_SET_SECURITY_BIT 0xf
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static uint16_t page_from_ramaddr(const void *addr)
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{
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uint32_t ramaddr = (uint32_t) addr;
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ramaddr -= (uint32_t) AT91C_IFLASH;
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return ((ramaddr >> AT91C_IFLASH_PAGE_SHIFT));
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}
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#define PAGES_PER_LOCKREGION (AT91C_IFLASH_LOCK_REGION_SIZE>>AT91C_IFLASH_PAGE_SHIFT)
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#define IS_FIRST_PAGE_OF_LOCKREGION(x) ((x % PAGES_PER_LOCKREGION) == 0)
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#define LOCKREGION_FROM_PAGE(x) (x / PAGES_PER_LOCKREGION)
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static int is_page_locked(uint16_t page)
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{
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uint16_t lockregion = LOCKREGION_FROM_PAGE(page);
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return (AT91C_BASE_MC->MC_FSR & (lockregion << 16));
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}
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static void unlock_page(uint16_t page)
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{
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page &= 0x3ff;
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AT91F_MC_EFC_PerformCmd(AT91C_BASE_MC, AT91C_MC_FCMD_UNLOCK |
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AT91C_MC_CORRECT_KEY | (page << 8));
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}
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void flash_page(uint8_t *addr)
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{
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uint16_t page = page_from_ramaddr(addr) & 0x3ff;
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uint32_t fsr = AT91F_MC_EFC_GetStatus(AT91C_BASE_MC);
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DEBUGP("flash_page(0x%x=%u) ", addr, page);
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if (is_page_locked(page)) {
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DEBUGP("unlocking ");
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unlock_page(page);
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}
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if (!(fsr & AT91C_MC_FRDY)) {
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DEBUGP("NOT_FLASHING ");
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return;
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}
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DEBUGP("performing start_prog ");
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AT91F_MC_EFC_PerformCmd(AT91C_BASE_MC, AT91C_MC_FCMD_START_PROG |
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AT91C_MC_CORRECT_KEY | (page << 8));
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}
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void flash_init(void)
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{
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unsigned int fmcn = AT91F_MC_EFC_ComputeFMCN(MCK);
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AT91F_MC_EFC_CfgModeReg(AT91C_BASE_MC, (fmcn&0xff) << 16 |
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AT91C_MC_FWS_3FWS);
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}
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