113 lines
2.1 KiB
C
113 lines
2.1 KiB
C
/*
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* Copyright (c) 2017 Linaro Limited
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <kernel.h>
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#include <device.h>
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#include <string.h>
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#include <flash.h>
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#include <init.h>
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#include <soc.h>
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#include <flash_stm32.h>
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bool flash_stm32_valid_range(off_t offset, u32_t len, bool write)
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{
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ARG_UNUSED(write);
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return offset >= 0 && (offset + len - 1 <= STM32F4X_FLASH_END);
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}
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static int write_byte(off_t offset, u8_t val, struct flash_stm32_priv *p)
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{
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struct stm32f4x_flash *regs = p->regs;
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u32_t tmp;
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int rc;
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/* if the control register is locked, do not fail silently */
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if (regs->cr & FLASH_CR_LOCK) {
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return -EIO;
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}
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rc = flash_stm32_wait_flash_idle(p);
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if (rc < 0) {
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return rc;
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}
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regs->cr &= ~CR_PSIZE_MASK;
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regs->cr |= FLASH_PSIZE_BYTE;
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regs->cr |= FLASH_CR_PG;
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/* flush the register write */
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tmp = regs->cr;
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*((u8_t *) offset + CONFIG_FLASH_BASE_ADDRESS) = val;
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rc = flash_stm32_wait_flash_idle(p);
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regs->cr &= (~FLASH_CR_PG);
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return rc;
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}
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static int erase_sector(u16_t sector, struct flash_stm32_priv *p)
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{
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struct stm32f4x_flash *regs = p->regs;
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u32_t tmp;
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int rc;
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/* if the control register is locked, do not fail silently */
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if (regs->cr & FLASH_CR_LOCK) {
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return -EIO;
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}
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rc = flash_stm32_wait_flash_idle(p);
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if (rc < 0) {
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return rc;
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}
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regs->cr &= STM32F4X_SECTOR_MASK;
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regs->cr |= FLASH_CR_SER | (sector << 3);
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regs->cr |= FLASH_CR_STRT;
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/* flush the register write */
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tmp = regs->cr;
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rc = flash_stm32_wait_flash_idle(p);
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regs->cr &= ~(FLASH_CR_SER | FLASH_CR_SNB);
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return rc;
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}
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int flash_stm32_block_erase_loop(unsigned int offset, unsigned int len,
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struct flash_stm32_priv *p)
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{
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int i, rc = 0;
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i = stm32f4x_get_sector(offset);
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for (; i <= stm32f4x_get_sector(offset + len - 1); i++) {
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rc = erase_sector(i, p);
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if (rc < 0) {
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break;
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}
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}
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return rc;
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}
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int flash_stm32_write_range(unsigned int offset, const void *data,
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unsigned int len, struct flash_stm32_priv *p)
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{
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int i, rc = 0;
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for (i = 0; i < len; i++, offset++) {
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rc = write_byte(offset, ((const u8_t *) data)[i], p);
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if (rc < 0) {
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return rc;
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}
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}
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return rc;
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}
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