cache.c

底层驱动开发

/*
 *  linux/arch/m32r/mm/cache.c
 *
 *  Copyright (C) 2002  Hirokazu Takata
 */

#include <linux/config.h>
#include <asm/pgtable.h>

#undef MCCR

#if defined(CONFIG_CHIP_XNUX2) || defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_OPSP)
/* Cache Control Register */
#define MCCR		((volatile unsigned long*)0xfffffffc)
#define MCCR_CC		(1UL << 7)	/* Cache mode modify bit */
#define MCCR_IIV	(1UL << 6)	/* I-cache invalidate */
#define MCCR_DIV	(1UL << 5)	/* D-cache invalidate */
#define MCCR_DCB	(1UL << 4)	/* D-cache copy back */
#define MCCR_ICM	(1UL << 1)	/* I-cache mode [0:off,1:on] */
#define MCCR_DCM	(1UL << 0)	/* D-cache mode [0:off,1:on] */
#define MCCR_ICACHE_INV		(MCCR_CC|MCCR_IIV)
#define MCCR_DCACHE_CB		(MCCR_CC|MCCR_DCB)
#define MCCR_DCACHE_CBINV	(MCCR_CC|MCCR_DIV|MCCR_DCB)
#define CHECK_MCCR(mccr)	(mccr = *MCCR)
#elif defined(CONFIG_CHIP_M32102)
#define MCCR		((volatile unsigned char*)0xfffffffe)
#define MCCR_IIV	(1UL << 0)	/* I-cache invalidate */
#define MCCR_ICACHE_INV		MCCR_IIV
#endif /* CONFIG_CHIP_XNUX2 || CONFIG_CHIP_M32700 */

#ifndef MCCR
#error Unknown cache type.
#endif


/* Copy back and invalidate D-cache and invalidate I-cache all */
void _flush_cache_all(void)
{
#if defined(CONFIG_CHIP_M32102)
	*MCCR = MCCR_ICACHE_INV;
#else
	unsigned long mccr;

	/* Copyback and invalidate D-cache */
	/* Invalidate I-cache */
	*MCCR = MCCR_ICACHE_INV | MCCR_DCACHE_CBINV;
	while ((mccr = *MCCR) & MCCR_IIV); /* loop while invalidating... */
#endif
}

/* Copy back D-cache and invalidate I-cache all */
void _flush_cache_copyback_all(void)
{
#if defined(CONFIG_CHIP_M32102)
	*MCCR = MCCR_ICACHE_INV;
#else
	unsigned long mccr;

	/* Copyback D-cache */
	/* Invalidate I-cache */
	*MCCR = MCCR_ICACHE_INV | MCCR_DCACHE_CB;
	while ((mccr = *MCCR) & MCCR_IIV); /* loop while invalidating... */

#endif
}