Linux Kernel  3.7.1
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mtd-xip.h
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1 /*
2  * MTD primitives for XIP support. Architecture specific functions
3  *
4  * Do not include this file directly. It's included from linux/mtd/xip.h
5  *
6  * Author: Nicolas Pitre
7  * Created: Nov 2, 2004
8  * Copyright: (C) 2004 MontaVista Software, Inc.
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  */
14 
15 #ifndef __ARCH_PXA_MTD_XIP_H__
16 #define __ARCH_PXA_MTD_XIP_H__
17 
18 #include <mach/regs-ost.h>
19 
20 #define xip_irqpending() (ICIP & ICMR)
21 
22 /* we sample OSCR and convert desired delta to usec (1/4 ~= 1000000/3686400) */
23 #define xip_currtime() (OSCR)
24 #define xip_elapsed_since(x) (signed)((OSCR - (x)) / 4)
25 
26 /*
27  * xip_cpu_idle() is used when waiting for a delay equal or larger than
28  * the system timer tick period. This should put the CPU into idle mode
29  * to save power and to be woken up only when some interrupts are pending.
30  * As above, this should not rely upon standard kernel code.
31  */
32 
33 #define xip_cpu_idle() asm volatile ("mcr p14, 0, %0, c7, c0, 0" :: "r" (1))
34 
35 #endif /* __ARCH_PXA_MTD_XIP_H__ */