1 /***************************************************************************
2 * Copyright (C) 2007 by Pavel Chromy *
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. *
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. *
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 ***************************************************************************/
21 /* debug channel read (debugger->MCU) */
24 volatile uint32 dcc_reg;
27 asm volatile ("mrc p14, 0, %0, C0, C0" : "=r" (dcc_reg) :);
28 } while ((dcc_reg&1) == 0);
30 asm volatile ("mrc p14, 0, %0, C1, C0" : "=r" (dcc_reg) :);
35 /* debug channel write (MCU->debugger) */
36 int dcc_wr(uint32 data)
38 volatile uint32 dcc_reg;
41 asm volatile ("mrc p14, 0, %0, C0, C0" : "=r" (dcc_reg) :);
42 /* operation controlled by master, cancel operation
43 upon reception of data for immediate response */
44 if (dcc_reg&1) return -1;
47 asm volatile ("mcr p14, 0, %0, C1, C0" : : "r" (data));