58 lines
2.2 KiB
ArmAsm
58 lines
2.2 KiB
ArmAsm
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/***************************************************************************
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* Copyright (C) 2010 by Spencer Oliver *
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* spen@spen-soft.co.uk *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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.text
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.arm
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.section .init
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/*
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r0 source address
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r1 address
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r2 FLASH_CR0
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r3 dword count
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r4 result
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r5 busy mask
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*/
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write:
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mov r4, #0x10000000 /* set DWPG bit */
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str r4, [r2, #0x0] /* FLASH_CR0 */
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str r1, [r2, #0x10] /* FLASH_AR */
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ldr r4, [r0], #4 /* load data */
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str r4, [r2, #0x8] /* FLASH_DR0 */
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ldr r4, [r0], #4 /* load data */
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str r4, [r2, #0xc] /* FLASH_DR1 */
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mov r4, #0x90000000 /* set DWPG and WMS bits */
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str r4, [r2, #0x0] /* FLASH_CR0 */
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busy:
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ldr r4, [r2, #0x0] /* FLASH_CR0 */
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tst r4, r5
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bne busy
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ldr r4, [r2, #0x14] /* FLASH_ER */
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tst r4, #0xff /* do we have errors */
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tsteq r4, #0x100 /* write protection set */
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bne exit
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add r1, r1, #0x8 /* next 8 bytes */
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subs r3, r3, #1 /* decremment dword count */
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bne write
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exit:
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b exit
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.end
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