forked from luck/tmp_suning_uos_patched
25985edced
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
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: conversion 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__ */
|