282 lines
6.6 KiB
C
282 lines
6.6 KiB
C
/*
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* Copyright (c) 2017 Linaro Limited
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* Copyright (c) 2017 BayLibre, SAS.
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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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/* STM32F0: maximum erase time of 40ms for a 2K sector */
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#if defined(CONFIG_SOC_SERIES_STM32F0X)
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#define STM32_FLASH_TIMEOUT (K_MSEC(40))
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/* STM32F4: maximum erase time of 4s for a 128K sector */
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#elif defined(CONFIG_SOC_SERIES_STM32F4X)
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#define STM32_FLASH_TIMEOUT (K_MSEC(4000))
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/* STM32F7: maximum erase time of 4s for a 256K sector */
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#elif defined(CONFIG_SOC_SERIES_STM32F7X)
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#define STM32_FLASH_TIMEOUT (K_MSEC(4000))
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/* STM32L4: maximum erase time of 24.47ms for a 2K sector */
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#elif defined(CONFIG_SOC_SERIES_STM32L4X)
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#define STM32_FLASH_TIMEOUT (K_MSEC(25))
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#endif
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/*
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* This is named flash_stm32_sem_take instead of flash_stm32_lock (and
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* similarly for flash_stm32_sem_give) to avoid confusion with locking
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* actual flash pages.
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*/
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static inline void flash_stm32_sem_take(struct device *dev)
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{
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k_sem_take(&FLASH_STM32_PRIV(dev)->sem, K_FOREVER);
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}
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static inline void flash_stm32_sem_give(struct device *dev)
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{
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k_sem_give(&FLASH_STM32_PRIV(dev)->sem);
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}
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static int flash_stm32_check_status(struct device *dev)
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{
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u32_t const error =
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#if defined(FLASH_FLAG_PGAERR)
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FLASH_FLAG_PGAERR |
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#endif
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#if defined(FLASH_FLAG_RDERR)
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FLASH_FLAG_RDERR |
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#endif
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#if defined(FLASH_FLAG_PGPERR)
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FLASH_FLAG_PGPERR |
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#endif
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#if defined(FLASH_FLAG_PGSERR)
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FLASH_FLAG_PGSERR |
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#endif
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#if defined(FLASH_FLAG_OPERR)
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FLASH_FLAG_OPERR |
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#endif
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#if defined(FLASH_FLAG_PGERR)
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FLASH_FLAG_PGERR |
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#endif
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FLASH_FLAG_WRPERR;
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if (FLASH_STM32_REGS(dev)->sr & error) {
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return -EIO;
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}
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return 0;
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}
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int flash_stm32_wait_flash_idle(struct device *dev)
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{
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s64_t timeout_time = k_uptime_get() + STM32_FLASH_TIMEOUT;
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int rc;
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rc = flash_stm32_check_status(dev);
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if (rc < 0) {
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return -EIO;
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}
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while ((FLASH_STM32_REGS(dev)->sr & FLASH_SR_BSY)) {
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if (k_uptime_get() > timeout_time) {
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return -EIO;
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}
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}
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return 0;
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}
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static void flash_stm32_flush_caches(struct device *dev,
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off_t offset, size_t len)
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{
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#if defined(CONFIG_SOC_SERIES_STM32F0X)
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ARG_UNUSED(dev);
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ARG_UNUSED(offset);
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ARG_UNUSED(len);
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#elif defined(CONFIG_SOC_SERIES_STM32F4X) || defined(CONFIG_SOC_SERIES_STM32L4X)
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ARG_UNUSED(offset);
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ARG_UNUSED(len);
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#if defined(CONFIG_SOC_SERIES_STM32F4X)
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struct stm32f4x_flash *regs = FLASH_STM32_REGS(dev);
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#elif defined(CONFIG_SOC_SERIES_STM32L4X)
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struct stm32l4x_flash *regs = FLASH_STM32_REGS(dev);
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#endif
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if (regs->acr.val & FLASH_ACR_DCEN) {
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regs->acr.val &= ~FLASH_ACR_DCEN;
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regs->acr.val |= FLASH_ACR_DCRST;
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regs->acr.val &= ~FLASH_ACR_DCRST;
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regs->acr.val |= FLASH_ACR_DCEN;
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}
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#elif defined(CONFIG_SOC_SERIES_STM32F7X)
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SCB_InvalidateDCache_by_Addr((uint32_t *)(CONFIG_FLASH_BASE_ADDRESS
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+ offset), len);
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#endif
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}
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static int flash_stm32_read(struct device *dev, off_t offset, void *data,
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size_t len)
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{
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if (!flash_stm32_valid_range(dev, offset, len, false)) {
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return -EINVAL;
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}
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if (!len) {
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return 0;
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}
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memcpy(data, (u8_t *) CONFIG_FLASH_BASE_ADDRESS + offset, len);
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return 0;
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}
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static int flash_stm32_erase(struct device *dev, off_t offset, size_t len)
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{
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int rc;
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if (!flash_stm32_valid_range(dev, offset, len, true)) {
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return -EINVAL;
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}
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if (!len) {
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return 0;
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}
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flash_stm32_sem_take(dev);
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rc = flash_stm32_block_erase_loop(dev, offset, len);
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flash_stm32_flush_caches(dev, offset, len);
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flash_stm32_sem_give(dev);
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return rc;
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}
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static int flash_stm32_write(struct device *dev, off_t offset,
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const void *data, size_t len)
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{
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int rc;
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if (!flash_stm32_valid_range(dev, offset, len, true)) {
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return -EINVAL;
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}
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if (!len) {
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return 0;
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}
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flash_stm32_sem_take(dev);
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rc = flash_stm32_write_range(dev, offset, data, len);
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flash_stm32_sem_give(dev);
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return rc;
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}
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static int flash_stm32_write_protection(struct device *dev, bool enable)
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{
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#if defined(CONFIG_SOC_SERIES_STM32F4X)
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struct stm32f4x_flash *regs = FLASH_STM32_REGS(dev);
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#elif defined(CONFIG_SOC_SERIES_STM32F7X)
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struct stm32f7x_flash *regs = FLASH_STM32_REGS(dev);
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#elif defined(CONFIG_SOC_SERIES_STM32F0X)
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struct stm32f0x_flash *regs = FLASH_STM32_REGS(dev);
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#elif defined(CONFIG_SOC_SERIES_STM32L4X)
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struct stm32l4x_flash *regs = FLASH_STM32_REGS(dev);
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#endif
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int rc = 0;
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flash_stm32_sem_take(dev);
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if (enable) {
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rc = flash_stm32_wait_flash_idle(dev);
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if (rc) {
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flash_stm32_sem_give(dev);
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return rc;
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}
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regs->cr |= FLASH_CR_LOCK;
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} else {
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if (regs->cr & FLASH_CR_LOCK) {
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regs->keyr = FLASH_KEY1;
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regs->keyr = FLASH_KEY2;
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}
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}
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flash_stm32_sem_give(dev);
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return rc;
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}
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static struct flash_stm32_priv flash_data = {
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#if defined(CONFIG_SOC_SERIES_STM32F0X)
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.regs = (struct stm32f0x_flash *) DT_FLASH_DEV_BASE_ADDRESS,
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.pclken = { .bus = STM32_CLOCK_BUS_AHB1,
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.enr = LL_AHB1_GRP1_PERIPH_FLASH },
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#elif defined(CONFIG_SOC_SERIES_STM32F4X)
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.regs = (struct stm32f4x_flash *) DT_FLASH_DEV_BASE_ADDRESS,
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#elif defined(CONFIG_SOC_SERIES_STM32F7X)
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.regs = (struct stm32f7x_flash *) DT_FLASH_DEV_BASE_ADDRESS,
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#elif defined(CONFIG_SOC_SERIES_STM32L4X)
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.regs = (struct stm32l4x_flash *) DT_FLASH_DEV_BASE_ADDRESS,
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.pclken = { .bus = STM32_CLOCK_BUS_AHB1,
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.enr = LL_AHB1_GRP1_PERIPH_FLASH },
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#endif
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};
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static const struct flash_driver_api flash_stm32_api = {
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.write_protection = flash_stm32_write_protection,
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.erase = flash_stm32_erase,
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.write = flash_stm32_write,
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.read = flash_stm32_read,
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#ifdef CONFIG_FLASH_PAGE_LAYOUT
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.page_layout = flash_stm32_page_layout,
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#endif
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#ifdef FLASH_WRITE_BLOCK_SIZE
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.write_block_size = FLASH_WRITE_BLOCK_SIZE,
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#else
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#error Flash write block size not available
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/* Flash Write block size is extracted from device tree */
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/* as flash node property 'write-block-size' */
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#endif
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};
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static int stm32_flash_init(struct device *dev)
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{
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struct flash_stm32_priv *p = FLASH_STM32_PRIV(dev);
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#if defined(CONFIG_SOC_SERIES_STM32L4X) || \
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defined(CONFIG_SOC_SERIES_STM32F0X)
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struct device *clk = device_get_binding(STM32_CLOCK_CONTROL_NAME);
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/*
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* On STM32F0, Flash interface clock source is always HSI,
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* so statically enable HSI here.
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*/
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#if defined(CONFIG_SOC_SERIES_STM32F0X)
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LL_RCC_HSI_Enable();
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while (!LL_RCC_HSI_IsReady()) {
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}
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#endif
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/* enable clock */
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if (clock_control_on(clk, (clock_control_subsys_t *)&p->pclken) != 0) {
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return -EIO;
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}
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#endif
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k_sem_init(&p->sem, 1, 1);
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return flash_stm32_write_protection(dev, false);
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}
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DEVICE_AND_API_INIT(stm32_flash, DT_FLASH_DEV_NAME,
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stm32_flash_init, &flash_data, NULL, POST_KERNEL,
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &flash_stm32_api);
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