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/***************************************************************************
* Copyright (C) 2014 by Ladislav Bábel *
* ladababel@seznam.cz *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
***************************************************************************/
#define INITIAL_UNLOCK 0x5A
#define MULTIPLE_UNLOCK 0xF2
#define FLASHCTRL_KEY 0x4002E0C0
#define FLASHCTRL_CONFIG 0x4002E000
#define FLASHCTRL_WRADDR 0x4002E0A0
#define FLASHCTRL_WRDATA 0x4002E0B0
#define BUSYF 0x00100000
/* Write the initial unlock value to KEY (0xA5) */
movs r6, #INITIAL_UNLOCK
str r6, [r0, #FLASHCTRL_KEY]
/* Write the multiple unlock value to KEY (0xF2) */
movs r6, #MULTIPLE_UNLOCK
str r6, [r0, #FLASHCTRL_KEY]
wait_fifo:
ldr r6, [r2, #0]
cmp r6, #0
beq exit
ldr r5, [r2, #4]
cmp r5, r6
beq wait_fifo
/* wait for BUSYF flag */
wait_busy1:
ldr r6, [r0, #FLASHCTRL_CONFIG]
tst r6, #BUSYF
bne wait_busy1
/* Write the destination address to WRADDR */
str r4, [r0, #FLASHCTRL_WRADDR]
/* Write the data half-word to WRDATA in right-justified format */
ldrh r6, [r5]
str r6, [r0, #FLASHCTRL_WRDATA]
adds r5, #2
adds r4, #2
/* wrap rp at end of buffer */
cmp r5, r3
bcc no_wrap
mov r5, r2
adds r5, #8
no_wrap:
str r5, [r2, #4]
subs r1, r1, #1
cmp r1, #0
beq exit
b wait_fifo
exit:
movs r6, #MULTIPLE_LOCK
str r6, [r0, #FLASHCTRL_KEY]
/* wait for BUSYF flag */
wait_busy2:
ldr r6, [r0, #FLASHCTRL_CONFIG]
tst r6, #BUSYF
bne wait_busy2
bkpt #0
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