xref: /linux/arch/m68k/include/asm/m54xxacr.h (revision 5b2e6555)

/*
 * Bit definitions for the MCF54xx ACR and CACR registers.
 */

#ifndef	m54xxacr_h
#define m54xxacr_h

/*
 *	Define the Cache register flags.
 */
#define CACR_DEC	0x80000000	/* Enable data cache */
#define CACR_DWP	0x40000000	/* Data write protection */
#define CACR_DESB	0x20000000	/* Enable data store buffer */
#define CACR_DDPI	0x10000000	/* Disable invalidation by CPUSHL */
#define CACR_DHCLK	0x08000000	/* Half data cache lock mode */
#define CACR_DDCM_WT	0x00000000	/* Write through cache*/
#define CACR_DDCM_CP	0x02000000	/* Copyback cache */
#define CACR_DDCM_P	0x04000000	/* No cache, precise */
#define CACR_DDCM_IMP	0x06000000	/* No cache, imprecise */
#define CACR_DCINVA	0x01000000	/* Invalidate data cache */
#define CACR_BEC	0x00080000	/* Enable branch cache */
#define CACR_BCINVA	0x00040000	/* Invalidate branch cache */
#define CACR_IEC	0x00008000	/* Enable instruction cache */
#define CACR_DNFB	0x00002000	/* Inhibited fill buffer */
#define CACR_IDPI	0x00001000	/* Disable CPUSHL */
#define CACR_IHLCK	0x00000800	/* Intruction cache half lock */
#define CACR_IDCM	0x00000400	/* Intruction cache inhibit */
#define CACR_ICINVA	0x00000100	/* Invalidate instr cache */

#define ACR_BASE_POS	24		/* Address Base */
#define ACR_MASK_POS	16		/* Address Mask */
#define ACR_ENABLE	0x00008000	/* Enable address */
#define ACR_USER	0x00000000	/* User mode access only */
#define ACR_SUPER	0x00002000	/* Supervisor mode only */
#define ACR_ANY		0x00004000	/* Match any access mode */
#define ACR_CM_WT	0x00000000	/* Write through mode */
#define ACR_CM_CP	0x00000020	/* Copyback mode */
#define ACR_CM_OFF_PRE	0x00000040	/* No cache, precise */
#define ACR_CM_OFF_IMP	0x00000060	/* No cache, imprecise */
#define ACR_CM		0x00000060	/* Cache mode mask */
#define ACR_WPROTECT	0x00000004	/* Write protect */

#if defined(CONFIG_M5407)

#define ICACHE_SIZE 0x4000	/* instruction - 16k */
#define DCACHE_SIZE 0x2000	/* data - 8k */

#elif defined(CONFIG_M54xx)

#define ICACHE_SIZE 0x8000	/* instruction - 32k */
#define DCACHE_SIZE 0x8000	/* data - 32k */

#endif

#define CACHE_LINE_SIZE 0x0010	/* 16 bytes */
#define CACHE_WAYS 4		/* 4 ways */

/*
 *	Version 4 cores have a true harvard style separate instruction
 *	and data cache. Enable data and instruction caches, also enable write
 *	buffers and branch accelerator.
 */
/* attention : enabling CACR_DESB requires a "nop" to flush the store buffer */
/* use '+' instead of '|' for assembler's sake */

	/* Enable data cache */
	/* Enable data store buffer */
	/* outside ACRs : No cache, precise */
	/* Enable instruction+branch caches */
#define CACHE_MODE (CACR_DEC+CACR_DESB+CACR_DDCM_P+CACR_BEC+CACR_IEC)

#define DATA_CACHE_MODE (ACR_ENABLE+ACR_ANY+ACR_CM_WT)

#define INSN_CACHE_MODE (ACR_ENABLE+ACR_ANY)

#ifndef __ASSEMBLY__

#if ((DATA_CACHE_MODE & ACR_CM) == ACR_CM_WT)
#define flush_dcache_range(a, l) do { asm("nop"); } while (0)
#endif

static inline void __m54xx_flush_cache_all(void)
{
	__asm__ __volatile__ (
#if ((DATA_CACHE_MODE & ACR_CM) == ACR_CM_CP)
	/*
	 *	Use cpushl to push and invalidate all cache lines.
	 *	Gas doesn't seem to know how to generate the ColdFire
	 *	cpushl instruction... Oh well, bit stuff it for now.
	 */
		"clrl	%%d0\n\t"
		"1:\n\t"
		"movel	%%d0,%%a0\n\t"
		"2:\n\t"
		".word	0xf468\n\t"
		"addl	%0,%%a0\n\t"
		"cmpl	%1,%%a0\n\t"
		"blt	2b\n\t"
		"addql	#1,%%d0\n\t"
		"cmpil	%2,%%d0\n\t"
		"bne	1b\n\t"
#endif
		"movel	%3,%%d0\n\t"
		"movec	%%d0,%%CACR\n\t"
		"nop\n\t"	/* forces flush of Store Buffer */
		: /* No output */
		: "i" (CACHE_LINE_SIZE),
		  "i" (DCACHE_SIZE / CACHE_WAYS),
		  "i" (CACHE_WAYS),
		  "i" (CACHE_MODE|CACR_DCINVA|CACR_BCINVA|CACR_ICINVA)
		: "d0", "a0" );
}

#define __flush_cache_all() __m54xx_flush_cache_all()

#endif /* __ASSEMBLY__ */

#endif	/* m54xxacr_h */