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/*
* Spansion FM4 flash write 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, data, tmp1, tmp2, tmp3
ldrb \tmp1, [\addr] /* ignore */
and \tmp2, \data, #FLASH_DPOL
1001:
ldrb \tmp1, [\addr]
and \tmp3, \tmp1, #FLASH_DPOL
cmp \tmp3, \tmp2
beq 1010f
and \tmp3, \tmp1, #FLASH_TLOV
cmp \tmp3, #0
beq 1001b
ldrb \tmp1, [\addr]
and \tmp3, \tmp1, #FLASH_DPOL
cmp \tmp3, \tmp2
beq 1010f
mov \res, #RESULT_TIMEOUT
bkpt #0
1010:
.endm
.macro write_one, res, cmdseqaddr1, cmdseqaddr2, pa, pd, tmp1, tmp2, tmp3
mov \tmp1, #0xAA
strh \tmp1, [\cmdseqaddr1]
mov \tmp1, #0x55
strh \tmp1, [\cmdseqaddr2]
mov \tmp1, #0xA0
strh \tmp1, [\cmdseqaddr1]
strh \pd, [\pa]
busy_wait \res, \pa, \pd, \tmp1, \tmp2, \tmp3
.endm
.macro write, cmdseqaddr1, cmdseqaddr2, dest, src, cnt, res, tmp1, tmp2, tmp3, tmp4
mov \res, #RESULT_NONE
2001:
cbz \cnt, 2010f
ldrh \tmp1, [\src]
write_one \res, \cmdseqaddr1, \cmdseqaddr2, \dest, \tmp1, \tmp2, \tmp3, \tmp4
sub \cnt, \cnt, #1
add \dest, \dest, #2
add \src, \src, #2
b 2001b
2010:
mov \res, #RESULT_OKAY
.endm
/* r0 = 0xAA8
* r1 = 0x554
* r2 = dest
* r3 = src
* r4 = cnt
* r5 = result
*/
write:
write r0, r1, r2, r3, r4, r5, r6, r7, r8, r9
bkpt #0
data:
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