59018b6d2a
Once upon a time, the MTD repository was using CVS. This patch therefore removes all usages of the no longer updated CVS keywords from the MTD code. This also includes code that printed them to the user. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/*
|
|
* MTD primitives for XIP support
|
|
*
|
|
* Author: Nicolas Pitre
|
|
* Created: Nov 2, 2004
|
|
* Copyright: (C) 2004 MontaVista Software, Inc.
|
|
*
|
|
* This XIP support for MTD has been loosely inspired
|
|
* by an earlier patch authored by David Woodhouse.
|
|
*
|
|
* 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 __LINUX_MTD_XIP_H__
|
|
#define __LINUX_MTD_XIP_H__
|
|
|
|
|
|
#ifdef CONFIG_MTD_XIP
|
|
|
|
/*
|
|
* We really don't want gcc to guess anything.
|
|
* We absolutely _need_ proper inlining.
|
|
*/
|
|
#include <linux/compiler.h>
|
|
|
|
/*
|
|
* Function that are modifying the flash state away from array mode must
|
|
* obviously not be running from flash. The __xipram is therefore marking
|
|
* those functions so they get relocated to ram.
|
|
*/
|
|
#define __xipram noinline __attribute__ ((__section__ (".data")))
|
|
|
|
/*
|
|
* Each architecture has to provide the following macros. They must access
|
|
* the hardware directly and not rely on any other (XIP) functions since they
|
|
* won't be available when used (flash not in array mode).
|
|
*
|
|
* xip_irqpending()
|
|
*
|
|
* return non zero when any hardware interrupt is pending.
|
|
*
|
|
* xip_currtime()
|
|
*
|
|
* return a platform specific time reference to be used with
|
|
* xip_elapsed_since().
|
|
*
|
|
* xip_elapsed_since(x)
|
|
*
|
|
* return in usecs the elapsed timebetween now and the reference x as
|
|
* returned by xip_currtime().
|
|
*
|
|
* note 1: convertion to usec can be approximated, as long as the
|
|
* returned value is <= the real elapsed time.
|
|
* note 2: this should be able to cope with a few seconds without
|
|
* overflowing.
|
|
*
|
|
* xip_iprefetch()
|
|
*
|
|
* Macro to fill instruction prefetch
|
|
* e.g. a series of nops: asm volatile (".rep 8; nop; .endr");
|
|
*/
|
|
|
|
#include <asm/mtd-xip.h>
|
|
|
|
#ifndef xip_irqpending
|
|
|
|
#warning "missing IRQ and timer primitives for XIP MTD support"
|
|
#warning "some of the XIP MTD support code will be disabled"
|
|
#warning "your system will therefore be unresponsive when writing or erasing flash"
|
|
|
|
#define xip_irqpending() (0)
|
|
#define xip_currtime() (0)
|
|
#define xip_elapsed_since(x) (0)
|
|
|
|
#endif
|
|
|
|
#ifndef xip_iprefetch
|
|
#define xip_iprefetch() do { } while (0)
|
|
#endif
|
|
|
|
/*
|
|
* xip_cpu_idle() is used when waiting for a delay equal or larger than
|
|
* the system timer tick period. This should put the CPU into idle mode
|
|
* to save power and to be woken up only when some interrupts are pending.
|
|
* This should not rely upon standard kernel code.
|
|
*/
|
|
#ifndef xip_cpu_idle
|
|
#define xip_cpu_idle() do { } while (0)
|
|
#endif
|
|
|
|
#else
|
|
|
|
#define __xipram
|
|
|
|
#endif /* CONFIG_MTD_XIP */
|
|
|
|
#endif /* __LINUX_MTD_XIP_H__ */
|