stm32x: add support for STM32F20x

ready for wider testing and comments on basic erase + programming.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

contrib/loaders/flash/stm32f2xxx.S

@@ -0,0 +1,63 @@
+/***************************************************************************
+ *   Copyright (C) 2010 by Spencer Oliver                                  *
+ *   spen@spen-soft.co.uk                                                  *
+ *                                                                         *
+ *   Copyright (C) 2011 Øyvind Harboe                                      *
+ *   oyvind.harboe@zylin.com                                               *
+ *                                                                         *
+ *   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 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.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+
+// Build : arm-eabi-gcc -c stm32f2xxx.S
+	.text
+	.syntax unified
+	.cpu cortex-m3
+	.thumb
+	.thumb_func
+	.global write
+
+/*
+	r0 - source address
+	r1 - target address
+	r2 - count (halfword-16bit)
+	r3 - result out
+	r4 - flash base
+*/
+
+#define STM32_FLASH_CR_OFFSET	0x10			/* offset of CR register in FLASH struct */
+#define STM32_FLASH_SR_OFFSET	0x0c			/* offset of CR register in FLASH struct */
+
+write:
+
+write_half_word:
+	ldr		r3, STM32_PROG16
+	str		r3, [r4, #STM32_FLASH_CR_OFFSET]
+	ldrh 	r3, [r0], #0x02						/* read one half-word from src, increment ptr */
+	strh 	r3, [r1], #0x02						/* write one half-word from src, increment ptr */
+busy:
+	ldr 	r3, [r4, #STM32_FLASH_SR_OFFSET]
+	tst 	r3, #0x10000						/* BSY (bit0) == 1 => operation in progress */
+	beq 	busy								/* wait more... */
+	tst		r3, #0xf0							/* PGSERR | PGPERR | PGAERR | WRPERR */
+	bne		exit								/* fail... */
+	subs	r2, r2, #0x01						/* decrement counter */
+	bne		write_half_word						/* write next half-word if anything left */
+exit:
+	bkpt	#0x00
+
+
+STM32_PROG16: .word 0x101 						/* PG | PSIZE_16*/

src/flash/nor/Makefile.am

@@ -25,6 +25,7 @@ NOR_DRIVERS = \
 	stmsmi.c \
 	stellaris.c \
 	stm32x.c \
+	stm32f2xxx.c \
 	str7x.c \
 	str9x.c \
 	str9xpec.c \

src/flash/nor/drivers.c

@@ -33,6 +33,7 @@ extern struct flash_driver aduc702x_flash;
 extern struct flash_driver stellaris_flash;
 extern struct flash_driver str9xpec_flash;
 extern struct flash_driver stm32x_flash;
+extern struct flash_driver stm32xf2xxx_flash;
 extern struct flash_driver tms470_flash;
 extern struct flash_driver ecosflash_flash;
 extern struct flash_driver ocl_flash;
@@ -60,6 +61,7 @@ static struct flash_driver *flash_drivers[] = {
 	&stellaris_flash,
 	&str9xpec_flash,
 	&stm32x_flash,
+	&stm32xf2xxx_flash,
 	&tms470_flash,
 	&ecosflash_flash,
 	&ocl_flash,