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5c189208b6
According to Atmel, their 926T processors (AT91 post RM9200) requires 'Wait for Interrupt' mode be entered right after disabling the processor clock in order to minimise current consumption when idle, so do both provided we're not running on a 920T (an RM9200). Furthermore, get rid of the #ifndef CONFIG_DEBUG_KERNEL, since arch_idle() can be turned off completely with the kernel parameter 'nohlt'. Cc: Andrew Victor <avictor.za@gmail.com> Signed-off-by: Anders Larsen <al@alarsen.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/*
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* arch/arm/mach-at91/include/mach/system.h
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*
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* Copyright (C) 2003 SAN People
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __ASM_ARCH_SYSTEM_H
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#define __ASM_ARCH_SYSTEM_H
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#include <mach/hardware.h>
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#include <mach/at91_st.h>
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#include <mach/at91_dbgu.h>
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#include <mach/at91_pmc.h>
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static inline void arch_idle(void)
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{
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/*
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* Disable the processor clock. The processor will be automatically
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* re-enabled by an interrupt or by a reset.
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*/
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at91_sys_write(AT91_PMC_SCDR, AT91_PMC_PCK);
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#ifndef CONFIG_CPU_ARM920T
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/*
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* Set the processor (CP15) into 'Wait for Interrupt' mode.
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* Post-RM9200 processors need this in conjunction with the above
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* to save power when idle.
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*/
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cpu_do_idle();
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#endif
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}
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void (*at91_arch_reset)(void);
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static inline void arch_reset(char mode, const char *cmd)
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{
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/* call the CPU-specific reset function */
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if (at91_arch_reset)
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(at91_arch_reset)();
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}
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#endif
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