54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/*
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* This file is part of the Black Magic Debug project.
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*
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* Copyright (C) 2015 Black Sphere Technologies Ltd.
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* Written by Gareth McMullin <gareth@blacksphere.co.nz>
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "stub.h"
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#include <stdint.h>
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/* No STM32L4 definitions in libopencm3 yet */
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#define FLASH_SR ((volatile uint32_t *) 0x40022010)
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#define FLASH_SR_EOP (1 << 0)
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#define SR_ERROR_MASK 0xC3FA
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#define FLASH_SR_BSY (1 << 16)
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#define FLASH_CR ((volatile uint32_t *) 0x40022014)
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#define FLASH_CR_PG (1 << 0)
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#define FLASH_CR_EOPIE (1 << 24)
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#define FLASH_CR_ERRIE (1 << 25)
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#define FLASH_SR_EOP (1 << 0)
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void __attribute__((naked))
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stm32l4_flash_write_stub(uint32_t *dest, uint32_t *src, uint32_t size)
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{
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if ((size & 7) || ((uint32_t)dest & 7))
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stub_exit(1);
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for (int i = 0; i < size; i += 8) {
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*FLASH_CR = FLASH_CR_EOPIE | FLASH_CR_ERRIE | FLASH_CR_PG;
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*dest++ = *src++;
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*dest++ = *src++;
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__asm("dsb");
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while (*FLASH_SR & FLASH_SR_BSY)
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;
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if ((*FLASH_SR & SR_ERROR_MASK) || !(*FLASH_SR & FLASH_SR_EOP))
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stub_exit(1);
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*FLASH_SR |= FLASH_SR_EOP;
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}
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*FLASH_CR = 0;
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stub_exit(0);
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}
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