Move STM32-specific source to lib/stm32 subdir.

lib/stm32/flash.c

@@ -0,0 +1,189 @@
+/*
+ * This file is part of the libopenstm32 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ * Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.nz>
+ *
+ * This program 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopenstm32/flash.h>
+
+void flash_prefetch_buffer_enable(void)
+{
+	FLASH_ACR |= FLASH_PRFTBE;
+}
+
+void flash_prefetch_buffer_disable(void)
+{
+	FLASH_ACR &= ~FLASH_PRFTBE;
+}
+
+void flash_halfcycle_enable(void)
+{
+	FLASH_ACR |= FLASH_HLFCYA;
+}
+
+void flash_halfcycle_disable(void)
+{
+	FLASH_ACR &= ~FLASH_HLFCYA;
+}
+
+void flash_set_ws(u32 ws)
+{
+	u32 reg32;
+
+	reg32 = FLASH_ACR;
+	reg32 &= ~((1 << 0) | (1 << 1) | (1 << 2));
+	reg32 |= ws;
+	FLASH_ACR = reg32;
+}
+
+void flash_unlock(void)
+{
+	/* Authorize the FPEC access. */
+	FLASH_KEYR = FLASH_KEY1;
+	FLASH_KEYR = FLASH_KEY2;
+}
+
+void flash_lock(void)
+{
+	FLASH_CR |= FLASH_LOCK;
+}
+
+void flash_clear_pgerr_flag(void)
+{
+	FLASH_SR |= FLASH_PGERR;
+}
+
+void flash_clear_eop_flag(void)
+{
+	FLASH_SR |= FLASH_EOP;
+}
+
+void flash_clear_wrprterr_flag(void)
+{
+	FLASH_SR |= FLASH_WRPRTERR;
+}
+
+void flash_clear_bsy_flag(void)
+{
+	FLASH_SR &= ~FLASH_BSY;
+}
+
+void flash_clear_status_flags(void)
+{
+	flash_clear_pgerr_flag();
+	flash_clear_eop_flag();
+	flash_clear_wrprterr_flag();
+	flash_clear_bsy_flag();
+}
+
+void flash_unlock_option_bytes(void)
+{
+	FLASH_OPTKEYR = FLASH_KEY1;
+	FLASH_OPTKEYR = FLASH_KEY2;
+}
+
+void flash_wait_for_last_operation(void)
+{
+	while ((FLASH_SR & FLASH_BSY) == FLASH_BSY)
+		;
+}
+
+void flash_program_word(u32 address, u32 data)
+{
+	/* Ensure that all flash operations are complete. */
+	flash_wait_for_last_operation();
+
+	/* Enable writes to flash. */
+	FLASH_CR |= FLASH_PG;
+
+	/* Program the first half of the word. */
+	(*(volatile u16 *)address) = (u16)data;
+
+	/* Wait for the write to complete. */
+	flash_wait_for_last_operation();
+
+	/* Program the second half of the word. */
+	(*(volatile u16 *)(address + 2)) = data >> 16;
+
+	/* Wait for the write to complete. */
+	flash_wait_for_last_operation();
+
+	/* Disable writes to flash. */
+	FLASH_CR &= ~FLASH_PG;
+}
+
+void flash_program_half_word(u32 address, u16 data)
+{
+	flash_wait_for_last_operation();
+
+	FLASH_CR |= FLASH_PG;
+
+	(*(volatile u16 *)address) = data;
+
+	flash_wait_for_last_operation();
+
+	FLASH_CR &= ~FLASH_PG;		/* Disable the PG bit. */
+}
+
+void flash_erase_page(u32 page_address)
+{
+	flash_wait_for_last_operation();
+
+	FLASH_CR |= FLASH_PER;
+	FLASH_AR = page_address;
+	FLASH_CR |= FLASH_STRT;
+
+	flash_wait_for_last_operation();
+	FLASH_CR &= ~FLASH_PER;
+}
+
+void flash_erase_all_pages(void)
+{
+	flash_wait_for_last_operation();
+
+	FLASH_CR |= FLASH_MER;		/* Enable mass erase. */
+	FLASH_CR |= FLASH_STRT;		/* Trigger the erase. */
+
+	flash_wait_for_last_operation();
+	FLASH_CR &= ~FLASH_MER;		/* Disable mass erase. */
+}
+
+void flash_erase_option_bytes(void)
+{
+	flash_wait_for_last_operation();
+
+	if ((FLASH_CR & FLASH_OPTWRE) == 0)
+		flash_unlock_option_bytes();
+
+	FLASH_CR |= FLASH_OPTER;	/* Enable option byte erase. */
+	FLASH_CR |= FLASH_STRT;
+	flash_wait_for_last_operation();
+	FLASH_CR &= ~FLASH_OPTER;	/* Disable option byte erase. */
+}
+
+void flash_program_option_bytes(u32 address, u16 data)
+{
+	flash_wait_for_last_operation();
+
+	if ((FLASH_CR & FLASH_OPTWRE) == 0)
+		flash_unlock_option_bytes();
+
+	FLASH_CR |= FLASH_OPTPG;	/* Enable option byte programming. */
+	(*(volatile u16 *)address) = data;
+	flash_wait_for_last_operation();
+	FLASH_CR &= ~FLASH_OPTPG;	/* Disable option byte programming. */
+}