78 lines
1.2 KiB
ArmAsm
78 lines
1.2 KiB
ArmAsm
|
/*
|
||
|
|
* Spansion FM4 flash sector erase algorithm
|
||
|
|
*
|
||
|
|
* Copyright (c) 2015 Andreas Färber
|
||
|
|
*
|
||
|
|
* Based on S6E2CC_MN709-00007 for S6E2CC/C5/C4/C3/C2/C1 series
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "fm4.h"
|
||
|
|
|
||
|
|
#define RESULT_OKAY 0
|
||
|
|
#define RESULT_NONE 1
|
||
|
|
#define RESULT_TIMEOUT 2
|
||
|
|
|
||
|
|
.macro busy_wait, res, addr, tmp1, tmp2, tmp3
|
||
|
|
|
||
|
|
ldrb \tmp1, [\addr] /* ignore */
|
||
|
|
1001:
|
||
|
|
ldrb \tmp1, [\addr]
|
||
|
|
ldrb \tmp2, [\addr]
|
||
|
|
|
||
|
|
and \tmp3, \tmp1, #FLASH_TOGG
|
||
|
|
and \tmp2, \tmp2, #FLASH_TOGG
|
||
|
|
cmp \tmp3, \tmp2
|
||
|
|
beq 1010f
|
||
|
|
|
||
|
|
and \tmp2, \tmp1, #FLASH_TLOV
|
||
|
|
cmp \tmp2, #0
|
||
|
|
beq 1001b
|
||
|
|
|
||
|
|
ldrb \tmp1, [\addr]
|
||
|
|
ldrb \tmp2, [\addr]
|
||
|
|
|
||
|
|
and \tmp3, \tmp1, #FLASH_TOGG
|
||
|
|
and \tmp2, \tmp2, #FLASH_TOGG
|
||
|
|
cmp \tmp3, \tmp2
|
||
|
|
beq 1010f
|
||
|
|
|
||
|
|
mov \res, #RESULT_TIMEOUT
|
||
|
|
bkpt #0
|
||
|
|
1010:
|
||
|
|
mov \res, #RESULT_OKAY
|
||
|
|
|
||
|
|
.endm
|
||
|
|
|
||
|
|
|
||
|
|
.macro erase, cmdseqaddr1, cmdseqaddr2, sa, res, tmp1, tmp2, tmp3
|
||
|
|
|
||
|
|
mov \res, #RESULT_NONE
|
||
|
|
|
||
|
|
mov \tmp1, #0xAA
|
||
|
|
strh \tmp1, [\cmdseqaddr1]
|
||
|
|
mov \tmp2, #0x55
|
||
|
|
strh \tmp2, [\cmdseqaddr2]
|
||
|
|
mov \tmp3, #0x80
|
||
|
|
strh \tmp3, [\cmdseqaddr1]
|
||
|
|
strh \tmp1, [\cmdseqaddr1]
|
||
|
|
strh \tmp2, [\cmdseqaddr2]
|
||
|
|
mov \tmp3, #0x30
|
||
|
|
strh \tmp3, [\sa]
|
||
|
|
|
||
|
|
busy_wait \res, \sa, \tmp1, \tmp2, \tmp3
|
||
|
|
|
||
|
|
.endm
|
||
|
|
|
||
|
|
|
||
|
|
/* r0 = 0xAA8
|
||
|
|
* r1 = 0x554
|
||
|
|
* r2 = SA
|
||
|
|
* r3 = result
|
||
|
|
*/
|
||
|
|
erase:
|
||
|
|
erase r0, r1, r2, r3, r4, r5, r6
|
||
|
|
|
||
|
|
bkpt #0
|
||
|
|
|
||
|
|
data:
|