From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- arch/arm/mach-ebsa110/include/mach/system.h | 39 +++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 arch/arm/mach-ebsa110/include/mach/system.h (limited to 'arch/arm/mach-ebsa110/include/mach/system.h') diff --git a/arch/arm/mach-ebsa110/include/mach/system.h b/arch/arm/mach-ebsa110/include/mach/system.h new file mode 100644 index 00000000..9a26245b --- /dev/null +++ b/arch/arm/mach-ebsa110/include/mach/system.h @@ -0,0 +1,39 @@ +/* + * arch/arm/mach-ebsa110/include/mach/system.h + * + * Copyright (C) 1996-2000 Russell King. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#ifndef __ASM_ARCH_SYSTEM_H +#define __ASM_ARCH_SYSTEM_H + +/* + * EBSA110 idling methodology: + * + * We can not execute the "wait for interrupt" instruction since that + * will stop our MCLK signal (which provides the clock for the glue + * logic, and therefore the timer interrupt). + * + * Instead, we spin, polling the IRQ_STAT register for the occurrence + * of any interrupt with core clock down to the memory clock. + */ +static inline void arch_idle(void) +{ + const char *irq_stat = (char *)0xff000000; + + /* disable clock switching */ + asm volatile ("mcr p15, 0, ip, c15, c2, 2" : : : "cc"); + + /* wait for an interrupt to occur */ + while (!*irq_stat); + + /* enable clock switching */ + asm volatile ("mcr p15, 0, ip, c15, c1, 2" : : : "cc"); +} + +#define arch_reset(mode, cmd) cpu_reset(0x80000000) + +#endif -- cgit v1.2.3