1 /*
2 * arch/arm/mach-at91/include/mach/system.h
3 *
4 * Copyright (C) 2003 SAN People
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #ifndef __ASM_ARCH_SYSTEM_H
22 #define __ASM_ARCH_SYSTEM_H
23
24 #include <mach/hardware.h>
25 #include <mach/at91_st.h>
26 #include <mach/at91_dbgu.h>
27 #include <mach/at91_pmc.h>
28
arch_idle(void)29 static inline void arch_idle(void)
30 {
31 /*
32 * Disable the processor clock. The processor will be automatically
33 * re-enabled by an interrupt or by a reset.
34 */
35 #ifdef AT91_PS
36 at91_sys_write(AT91_PS_CR, AT91_PS_CR_CPU);
37 #else
38 at91_sys_write(AT91_PMC_SCDR, AT91_PMC_PCK);
39 #endif
40 #ifndef CONFIG_CPU_ARM920T
41 /*
42 * Set the processor (CP15) into 'Wait for Interrupt' mode.
43 * Post-RM9200 processors need this in conjunction with the above
44 * to save power when idle.
45 */
46 cpu_do_idle();
47 #endif
48 }
49
50 #endif
51