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[openocd.git] / contrib / loaders / flash / at91sam7x / dcc.c
1 /***************************************************************************
2 * Copyright (C) 2007 by Pavel Chromy *
3 * chromy@asix.cz *
4 * *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 * *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
14 * *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
17 ***************************************************************************/
18 #include "dcc.h"
19
20
21 /* debug channel read (debugger->MCU) */
22 uint32 dcc_rd(void)
23 {
24 volatile uint32 dcc_reg;
25
26 do {
27 asm volatile ("mrc p14, 0, %0, C0, C0" : "=r" (dcc_reg) :);
28 } while ((dcc_reg&1) == 0);
29
30 asm volatile ("mrc p14, 0, %0, C1, C0" : "=r" (dcc_reg) :);
31 return dcc_reg;
32 }
33
34
35 /* debug channel write (MCU->debugger) */
36 int dcc_wr(uint32 data)
37 {
38 volatile uint32 dcc_reg;
39
40 do {
41 asm volatile ("mrc p14, 0, %0, C0, C0" : "=r" (dcc_reg) :);
42 /* operation controled by master, cancel operation
43 upon reception of data for immediate response */
44 if (dcc_reg&1) return -1;
45 } while (dcc_reg&2);
46
47 asm volatile ("mcr p14, 0, %0, C1, C0" : : "r" (data));
48 return 0;
49 }