tinyriscv-openocd/contrib/loaders/flash/str7x.s

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/***************************************************************************
* Copyright (C) 2010 by Spencer Oliver *
* spen@spen-soft.co.uk *
* *
* 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. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
.text
.arm
.arch armv4t
.section .init
/*
r0 source address
r1 address
r2 FLASH_CR0
r3 dword count
r4 result
r5 busy mask
*/
write:
mov r4, #0x10000000 /* set DWPG bit */
str r4, [r2, #0x0] /* FLASH_CR0 */
str r1, [r2, #0x10] /* FLASH_AR */
ldr r4, [r0], #4 /* load data */
str r4, [r2, #0x8] /* FLASH_DR0 */
ldr r4, [r0], #4 /* load data */
str r4, [r2, #0xc] /* FLASH_DR1 */
mov r4, #0x90000000 /* set DWPG and WMS bits */
str r4, [r2, #0x0] /* FLASH_CR0 */
busy:
ldr r4, [r2, #0x0] /* FLASH_CR0 */
tst r4, r5
bne busy
ldr r4, [r2, #0x14] /* FLASH_ER */
tst r4, #0xff /* do we have errors */
tsteq r4, #0x100 /* write protection set */
bne exit
add r1, r1, #0x8 /* next 8 bytes */
subs r3, r3, #1 /* decremment dword count */
bne write
exit:
b exit
.end