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