mirror of
https://github.com/FEX-Emu/linux.git
synced 2025-02-08 04:18:27 +00:00
aec9562f3d
Disable the processor clock when the CPU is idle. This saves much more power than merely entering 'Wait for Interrupt' mode. Since JTAG-debugging doesn't work when the processor clock is switched off, make it conditional on CONFIG_DEBUG_KERNEL. Signed-off-by: Anders Larsen <al@alarsen.net> Acked-by: Andrew Victor <avictor.za@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/*
|
|
* arch/arm/mach-at91/include/mach/system.h
|
|
*
|
|
* Copyright (C) 2003 SAN People
|
|
*
|
|
* 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, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef __ASM_ARCH_SYSTEM_H
|
|
#define __ASM_ARCH_SYSTEM_H
|
|
|
|
#include <mach/hardware.h>
|
|
#include <mach/at91_st.h>
|
|
#include <mach/at91_dbgu.h>
|
|
#include <mach/at91_pmc.h>
|
|
|
|
static inline void arch_idle(void)
|
|
{
|
|
#ifndef CONFIG_DEBUG_KERNEL
|
|
/*
|
|
* Disable the processor clock. The processor will be automatically
|
|
* re-enabled by an interrupt or by a reset.
|
|
*/
|
|
at91_sys_write(AT91_PMC_SCDR, AT91_PMC_PCK);
|
|
#else
|
|
/*
|
|
* Set the processor (CP15) into 'Wait for Interrupt' mode.
|
|
* Unlike disabling the processor clock via the PMC (above)
|
|
* this allows the processor to be woken via JTAG.
|
|
*/
|
|
cpu_do_idle();
|
|
#endif
|
|
}
|
|
|
|
void (*at91_arch_reset)(void);
|
|
|
|
static inline void arch_reset(char mode, const char *cmd)
|
|
{
|
|
/* call the CPU-specific reset function */
|
|
if (at91_arch_reset)
|
|
(at91_arch_reset)();
|
|
}
|
|
|
|
#endif
|