76 lines
2.6 KiB
ArmAsm
76 lines
2.6 KiB
ArmAsm
/***************************************************************************
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* Copyright (C) 2005, 2007 by Dominic Rath *
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* Dominic.Rath@gmx.de *
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* Copyright (C) 2010 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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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
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***************************************************************************/
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.text
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.arm
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.arch armv4
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.section .init
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/* input parameters - */
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/* R0 = source address */
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/* R1 = destination address */
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/* R2 = number of writes */
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/* R3 = flash write command */
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/* R4 = constant to mask DQ7 bits (also used for Dq5 with shift) */
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/* output parameters - */
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/* R5 = 0x80 ok 0x00 bad */
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/* temp registers - */
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/* R6 = value read from flash to test status */
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/* R7 = holding register */
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/* unlock registers - */
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/* R8 = unlock1_addr */
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/* R9 = unlock1_cmd */
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/* R10 = unlock2_addr */
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/* R11 = unlock2_cmd */
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code:
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ldr r5, [r0], #4
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str r9, [r8]
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str r11, [r10]
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str r3, [r8]
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str r5, [r1]
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nop
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busy:
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ldr r6, [r1]
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eor r7, r5, r6
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ands r7, r4, r7
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beq cont /* b if DQ7 == Data7 */
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ands r6, r6, r4, lsr #2
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beq busy /* b if DQ5 low */
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ldr r6, [r1]
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eor r7, r5, r6
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ands r7, r4, r7
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beq cont /* b if DQ7 == Data7 */
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mov r5, #0 /* 0x0 - return 0x00, error */
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bne done
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cont:
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subs r2, r2, #1 /* 0x1 */
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moveq r5, #128 /* 0x80 */
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beq done
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add r1, r1, #4 /* 0x4 */
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b code
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done:
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b done
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.end
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