max32xxx: Support for MAX32XXX devices.

[openocd] / contrib / loaders / flash / max32xxx / max32xxx.s

diff --git a/contrib/loaders/flash/max32xxx/max32xxx.s b/contrib/loaders/flash/max32xxx/max32xxx.s
new file mode 100644 (file)
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+++ b/contrib/loaders/flash/max32xxx/max32xxx.s
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+/***************************************************************************
+ *   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