1 /***************************************************************************
2 * Copyright (C) 2010 by Spencer Oliver *
3 * spen@spen-soft.co.uk *
5 * Copyright (C) 2011 Øyvind Harboe *
6 * oyvind.harboe@zylin.com *
8 * This program is free software; you can redistribute it and/or modify *
9 * it under the terms of the GNU General Public License as published by *
10 * the Free Software Foundation; either version 2 of the License, or *
11 * (at your option) any later version. *
13 * This program is distributed in the hope that it will be useful, *
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16 * GNU General Public License for more details. *
18 * You should have received a copy of the GNU General Public License *
19 * along with this program; if not, write to the *
20 * Free Software Foundation, Inc., *
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
22 ***************************************************************************/
31 * r0 = workarea start, status (out)
34 * r3 = count (16bit words)
43 #define STM32_FLASH_CR_OFFSET 0x10 /* offset of CR register in FLASH struct */
44 #define STM32_FLASH_SR_OFFSET 0x0c /* offset of SR register in FLASH struct */
46 #define STM32_PROG16 0x101 /* PG | PSIZE_16*/
52 ldr r8, [r0, #0] /* read wp */
53 cmp r8, #0 /* abort if wp == 0 */
55 ldr r7, [r0, #4] /* read rp */
56 cmp r7, r8 /* wait until rp != wp */
60 str r6, [r4, #STM32_FLASH_CR_OFFSET]
61 ldrh r6, [r7], #0x02 /* read one half-word from src, increment ptr */
62 strh r6, [r2], #0x02 /* write one half-word from src, increment ptr */
65 ldr r6, [r4, #STM32_FLASH_SR_OFFSET]
66 tst r6, #0x10000 /* BSY (bit16) == 1 => operation in progress */
67 bne busy /* wait more... */
68 tst r6, #0xf0 /* PGSERR | PGPERR | PGAERR | WRPERR */
69 bne error /* fail... */
71 cmp r7, r1 /* wrap rp at end of buffer */
73 addcs r7, r0, #8 /* skip loader args */
74 str r7, [r0, #4] /* store rp */
75 subs r3, r3, #1 /* decrement halfword count */
76 cbz r3, exit /* loop if not done */
80 str r1, [r0, #4] /* set rp = 0 on error */
82 mov r0, r6 /* return status in r0 */