+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief STM32F103xx internal flash memory driver.
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+#include "flash_stm32.h"
+
+#include "cfg/cfg_emb_flash.h"
+
+// Define log settings for cfg/log.h
+#define LOG_LEVEL CONFIG_FLASH_EMB_LOG_LEVEL
+#define LOG_FORMAT CONFIG_FLASH_EMB_LOG_FORMAT
+#include <cfg/log.h>
+
+#include <drv/timer.h>
+#include <drv/flash.h>
+
+#include <cpu/power.h>
+#include <cpu/detect.h>
+
+#include <io/stm32.h>
+
+#include <string.h>
+
+#define EMB_FLASH ((struct stm32_flash*)FLASH_R_BASE)
+
+#if CPU_CM3_STM32F103RB
+ #define EMB_FLASH_PAGE_SIZE 1024
+#else
+ #error Unknown CPU
+#endif
+
+
+struct FlashHardware
+{
+ uint8_t status;
+};
+
+INLINE bool flash_wait(struct KBlock *blk)
+{
+ Flash *fls = FLASH_CAST(blk);
+ ticks_t start = timer_clock();
+ while (true)
+ {
+ if (!(EMB_FLASH->SR & FLASH_FLAG_BSY))
+ break;
+
+ if (EMB_FLASH->SR & FLASH_FLAG_PGERR)
+ {
+ fls->hw->status |= FLASH_NOT_ERASED;
+ LOG_ERR("flash not erased..\n");
+ return false;
+ }
+
+ if (EMB_FLASH->SR & FLASH_FLAG_WRPRTERR)
+ {
+ fls->hw->status |= FLASH_WR_PROTECT;
+ LOG_ERR("wr protect..\n");
+ return false;
+ }
+
+ if (timer_clock() - start > ms_to_ticks(CONFIG_FLASH_WR_TIMEOUT))
+ {
+ fls->hw->status |= FLASH_WR_TIMEOUT;
+ LOG_ERR("Timeout..\n");
+ return false;
+ }
+
+ cpu_relax();
+ }
+
+ return true;
+}
+
+static bool stm32_erasePage(struct KBlock *blk, uint32_t page_add)
+{
+
+ EMB_FLASH->CR |= CR_PER_SET;
+ EMB_FLASH->AR = page_add;
+ EMB_FLASH->CR |= CR_STRT_SET;
+
+ if (!flash_wait(blk))
+ return false;
+
+ EMB_FLASH->CR &= CR_PER_RESET;
+
+ return true;
+}
+
+static bool stm32_eraseAll(struct KBlock *blk)
+{
+ EMB_FLASH->CR |= CR_MER_SET;
+ EMB_FLASH->CR |= CR_STRT_SET;
+
+ if (!flash_wait(blk))
+ return false;
+
+ EMB_FLASH->CR &= CR_MER_RESET;
+
+ return true;
+}
+
+static int stm32_flash_error(struct KBlock *blk)
+{
+ Flash *fls = FLASH_CAST(blk);
+ return fls->hw->status;
+}
+
+static void stm32_flash_clearerror(struct KBlock *blk)
+{
+ Flash *fls = FLASH_CAST(blk);
+ fls->hw->status = 0;
+}
+
+static size_t stm32_flash_readDirect(struct KBlock *blk, block_idx_t idx, void *buf, size_t offset, size_t size)
+{
+ memcpy(buf, (void *)(idx * blk->blk_size + offset), size);
+
+ return size;
+}
+
+
+INLINE bool stm32_writeWord(struct KBlock *blk, uint32_t addr, uint16_t data)
+{
+ ASSERT(!(addr % 2));
+
+ EMB_FLASH->CR |= CR_PG_SET;
+
+ *(reg16_t *)addr = data;
+
+ if (!flash_wait(blk))
+ return false;
+
+ EMB_FLASH->CR &= CR_PG_RESET;
+
+ return true;
+}
+
+static size_t stm32_flash_writeDirect(struct KBlock *blk, block_idx_t idx, const void *_buf, size_t offset, size_t size)
+{
+ if (!stm32_erasePage(blk, (idx * blk->blk_size)))
+ return 0;
+
+ uint32_t addr = idx * blk->blk_size + offset;
+ const uint8_t *buf = (const uint8_t *)_buf;
+ size_t count = 0;
+
+ if (addr % 2)
+ {
+ if (!stm32_writeWord(blk, addr - 1, (buf[0] << 8) | 0xFF))
+ return count;
+
+ buf++;
+ size--;
+ count++;
+ addr++;
+ }
+
+ ASSERT(!(addr % 2));
+ while (size)
+ {
+ uint16_t data;
+ size_t len;
+ if (size == 1)
+ {
+ data = 0xFF00 | *buf;
+ len = 1;
+ }
+ else
+ {
+ data = ((*buf + 1) << 8) | *buf;
+ len = 2;
+ }
+
+ if (!stm32_writeWord(blk, addr, data))
+ return count;
+
+ buf += len;
+ size -= len;
+ count += len;
+ addr += len;
+ }
+ return count;
+}
+
+static const KBlockVTable flash_stm32_buffered_vt =
+{
+ .readDirect = stm32_flash_readDirect,
+ .writeDirect = stm32_flash_writeDirect,
+
+ .readBuf = kblock_swReadBuf,
+ .writeBuf = kblock_swWriteBuf,
+ .load = kblock_swLoad,
+ .store = kblock_swStore,
+
+ .error = stm32_flash_error,
+ .clearerr = stm32_flash_clearerror,
+};
+
+
+
+static const KBlockVTable flash_stm32_unbuffered_vt =
+{
+ .readDirect = stm32_flash_readDirect,
+ .writeDirect = stm32_flash_writeDirect,
+
+ .error = stm32_flash_error,
+ .clearerr = stm32_flash_clearerror,
+};
+
+static struct FlashHardware flash_stm32_hw;
+static uint8_t flash_buf[EMB_FLASH_PAGE_SIZE];
+
+static void common_init(Flash *fls)
+{
+ memset(fls, 0, sizeof(*fls));
+ DB(fls->blk.priv.type = KBT_FLASH);
+
+ EMB_FLASH->CR = 0;
+
+ fls->hw = &flash_stm32_hw;
+
+ fls->blk.blk_size = EMB_FLASH_PAGE_SIZE;
+ fls->blk.blk_cnt = (F_SIZE * 1024) / EMB_FLASH_PAGE_SIZE;
+
+ /* Unlock flash memory for the FPEC Access */
+ EMB_FLASH->KEYR = FLASH_KEY1;
+ EMB_FLASH->KEYR = FLASH_KEY2;
+}
+
+
+void flash_hw_init(Flash *fls)
+{
+ common_init(fls);
+ fls->blk.priv.vt = &flash_stm32_buffered_vt;
+ fls->blk.priv.flags |= KB_BUFFERED | KB_PARTIAL_WRITE;
+ fls->blk.priv.buf = flash_buf;
+}
+
+void flash_hw_initUnbuffered(Flash *fls)
+{
+ common_init(fls);
+ fls->blk.priv.vt = &flash_stm32_unbuffered_vt;
+}