max32xxx: Support for MAX32XXX devices.

Adding flash programming support for Maxim Integrated MAX32XXX
devices.

Change-Id: I5b0f57a885f9d813240e4bc2d9f765b743e1cfc3
Signed-off-by: Kevin Gillespie <kgills@gmail.com>
Reviewed-on: http://openocd.zylin.com/3543
Tested-by: jenkins
Reviewed-by: Ismail H. KOSE <ihkose@gmail.com>
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

4 files changed, 96 insertions, 0 deletions

diff --git a/contrib/loaders/Makefile b/contrib/loaders/Makefile
index a9a2770..0a637af 100644
--- a/contrib/loaders/Makefile
+++ b/contrib/loaders/Makefile
@@ -12,6 +12,7 @@ ARM_CROSS_COMPILE ?= arm-none-eabi-
 arm_dirs = \
 	flash/fm4 \
 	flash/kinetis_ke \
+	flash/max32xxx \
 	flash/xmc1xxx \
 	debug/xscale
 
diff --git a/contrib/loaders/flash/max32xxx/Makefile b/contrib/loaders/flash/max32xxx/Makefile
new file mode 100644
index 0000000..8f3f924
--- /dev/null
+++ b/contrib/loaders/flash/max32xxx/Makefile
@@ -0,0 +1,19 @@
+BIN2C = ../../../../src/helper/bin2char.sh
+
+CROSS_COMPILE ?= arm-none-eabi-
+AS      = $(CROSS_COMPILE)as
+OBJCOPY = $(CROSS_COMPILE)objcopy
+
+all: max32xxx.inc
+
+%.elf: %.s
+	$(AS) $< -o $@
+
+%.bin: %.elf
+	$(OBJCOPY) -Obinary $< $@
+
+%.inc: %.bin
+	$(BIN2C) < $< > $@
+
+clean:
+	-rm -f *.elf *.bin *.inc
diff --git a/contrib/loaders/flash/max32xxx/max32xxx.inc b/contrib/loaders/flash/max32xxx/max32xxx.inc
new file mode 100644
index 0000000..442165d
--- /dev/null
+++ b/contrib/loaders/flash/max32xxx/max32xxx.inc
@@ -0,0 +1,6 @@
+/* Autogenerated with ../../../../src/helper/bin2char.sh */
+0xdf,0xf8,0x44,0x40,0xd0,0xf8,0x00,0x80,0xb8,0xf1,0x00,0x0f,0x1a,0xd0,0x47,0x68,
+0x47,0x45,0xf7,0xd0,0x22,0x60,0x02,0xf1,0x04,0x02,0x57,0xf8,0x04,0x8b,0xc4,0xf8,
+0x30,0x80,0xa5,0x68,0x45,0xf0,0x01,0x05,0xa5,0x60,0xd4,0xf8,0x08,0x80,0x18,0xf0,
+0x01,0x0f,0xfa,0xd1,0x8f,0x42,0x28,0xbf,0x00,0xf1,0x08,0x07,0x47,0x60,0x01,0x3b,
+0x03,0xb1,0xdf,0xe7,0x00,0xbe,0x00,0xbf,0x00,0x00,0x00,0x40,
diff --git a/contrib/loaders/flash/max32xxx/max32xxx.s b/contrib/loaders/flash/max32xxx/max32xxx.s
new file mode 100644
index 0000000..f5306d6
--- /dev/null
+++ b/contrib/loaders/flash/max32xxx/max32xxx.s
@@ -0,0 +1,70 @@
+/***************************************************************************
+ *   Copyright (C) 2016 by Maxim Integrated                                *
+ *   Kevin Gillespie <kevin.gillespie@maximintegrated.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, see <http://www.gnu.org/licenses/>. *
+ ***************************************************************************/
+
+.text
+.syntax unified
+.cpu cortex-m3
+.thumb
+.thumb_func
+
+/*
+ * Params :
+ * r0 = workarea start
+ * r1 = workarea end
+ * r2 = target address
+ * r3 = count (32bit words)
+ * r4 = pFLASH_CTRL_BASE
+ *
+ * Clobbered:
+ * r5 = FLASHWRITECMD
+ * r7 - rp
+ * r8 - wp, tmp
+ */
+
+write:
+
+wait_fifo:
+ldr 	r8, [r0, #0]	/* read wp */
+cmp 	r8, #0			/* abort if wp == 0 */
+beq 	exit
+ldr 	r7, [r0, #4]	/* read rp */
+cmp 	r7, r8			/* wait until rp != wp */
+beq 	wait_fifo
+
+mainloop:
+str		r2, [r4, #0x00]	/* FLSH_ADDR - write address */
+add		r2, r2, #4		/* increment target address */
+ldr		r8, [r7], #4
+str		r8, [r4, #0x30]	/* FLSH_DATA0 - write data */
+ldr		r5, [r4, #0x08]	/* FLSH_CN */
+orr		r5, r5, #1
+str		r5, [r4, #0x08]	/* FLSH_CN - enable write */
+busy:
+ldr		r8, [r4, #0x08]	/* FLSH_CN */
+tst		r8, #1
+bne		busy
+
+cmp 	r7, r1			/* wrap rp at end of buffer */
+it  	cs
+addcs	r7, r0, #8		/* skip loader args */
+str 	r7, [r0, #4]	/* store rp */
+subs	r3, r3, #1		/* decrement word count */
+cbz 	r3, exit		/* loop if not done */
+b		wait_fifo
+exit:
+bkpt