1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
/*
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* linux/include/asm-arm/arch-ebsa110/system.h
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*
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* Copyright (C) 1996-2000 Russell King.
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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 version 2 as
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* published by the Free Software Foundation.
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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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/*
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* EBSA110 idling methodology:
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*
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* We can not execute the "wait for interrupt" instruction since that
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* will stop our MCLK signal (which provides the clock for the glue
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* logic, and therefore the timer interrupt).
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*
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* Instead, we spin, polling the IRQ_STAT register for the occurrence
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* of any interrupt with core clock down to the memory clock.
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*/
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static inline void arch_idle(void)
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{
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const char *irq_stat = (char *)0xff000000;
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/* disable clock switching */
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asm volatile ("mcr p15, 0, ip, c15, c2, 2" : : : "cc");
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/* wait for an interrupt to occur */
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while (!*irq_stat);
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/* enable clock switching */
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asm volatile ("mcr p15, 0, ip, c15, c1, 2" : : : "cc");
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}
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#define arch_reset(mode) cpu_reset(0x80000000)
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#endif
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