[STM32F0] Add preliminary support for the family

lib/stm32/f0/flash.c

@@ -0,0 +1,93 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2013 Frantisek Burian <BuFran@seznam.cz>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/flash.h>
+
+void flash_prefetch_buffer_enable(void)
+{
+	FLASH_ACR |= FLASH_ACR_PRFTBE;
+}
+
+void flash_prefetch_buffer_disable(void)
+{
+	FLASH_ACR &= ~FLASH_ACR_PRFTBE;
+}
+
+void flash_set_ws(uint32_t ws)
+{
+	FLASH_ACR = (FLASH_ACR & ~FLASH_ACR_LATENCY) | ws;
+}
+
+void flash_wait_busy(void)
+{
+	while ((FLASH_SR & FLASH_SR_BSY) != 0);
+}
+
+void flash_program_u32(uint32_t address, uint32_t data)
+{
+	flash_wait_busy();
+
+	FLASH_CR |= FLASH_CR_PG;
+
+	MMIO16(address) = (uint16_t)data;
+
+	flash_wait_busy();
+
+	MMIO16(address + 2) = data >> 16;
+
+	flash_wait_busy();
+
+	FLASH_CR &= ~FLASH_CR_PG;
+}
+
+void flash_program_u16(uint32_t address, uint16_t data)
+{
+	flash_wait_busy();
+
+	FLASH_CR |= FLASH_CR_PG;
+
+	MMIO16(address) = data;
+
+	flash_wait_busy();
+
+	FLASH_CR &= ~FLASH_CR_PG;
+}
+
+void flash_erase_page(uint32_t page_address)
+{
+	flash_wait_busy();
+
+	FLASH_CR |= FLASH_CR_PER;
+	FLASH_AR = page_address;
+	FLASH_CR |= FLASH_CR_STRT;
+
+	flash_wait_busy();
+	FLASH_CR &= ~FLASH_CR_PER;
+}
+
+void flash_erase_all_pages(void)
+{
+	flash_wait_busy();
+
+	FLASH_CR |= FLASH_CR_MER;		/* Enable mass erase. */
+	FLASH_CR |= FLASH_CR_STRT;		/* Trigger the erase. */
+
+	flash_wait_busy();
+	FLASH_CR &= ~FLASH_CR_MER;		/* Disable mass erase. */
+}