mirror of https://gitee.com/openkylin/linux.git
40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
/*
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* MTD primitives for XIP support. Architecture specific functions
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*
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* Do not include this file directly. It's included from linux/mtd/xip.h
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*
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* Author: Nicolas Pitre
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* Created: Nov 2, 2004
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* Copyright: (C) 2004 MontaVista Software, Inc.
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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 __ARCH_PXA_MTD_XIP_H__
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#define __ARCH_PXA_MTD_XIP_H__
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#include <mach/regs-ost.h>
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/* restored July 2017, this did not build since 2011! */
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#define ICIP io_p2v(0x40d00000)
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#define ICMR io_p2v(0x40d00004)
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#define xip_irqpending() (readl(ICIP) & readl(ICMR))
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/* we sample OSCR and convert desired delta to usec (1/4 ~= 1000000/3686400) */
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#define xip_currtime() readl(OSCR)
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#define xip_elapsed_since(x) (signed)((readl(OSCR) - (x)) / 4)
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/*
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* xip_cpu_idle() is used when waiting for a delay equal or larger than
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* the system timer tick period. This should put the CPU into idle mode
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* to save power and to be woken up only when some interrupts are pending.
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* As above, this should not rely upon standard kernel code.
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*/
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#define xip_cpu_idle() asm volatile ("mcr p14, 0, %0, c7, c0, 0" :: "r" (1))
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#endif /* __ARCH_PXA_MTD_XIP_H__ */
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