arch/microblaze/kernel/cpu/cache.c - linux - Git at Google

 /*
  * Cache control for MicroBlaze cache memories
  *
  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
  * Copyright (C) 2007-2009 PetaLogix
  * Copyright (C) 2007-2009 John Williams <john.williams@petalogix.com>
  *
  * This file is subject to the terms and conditions of the GNU General
  * Public License. See the file COPYING in the main directory of this
  * archive for more details.
  */

 #include <asm/cacheflush.h>
 #include <linux/cache.h>
 #include <asm/cpuinfo.h>
 #include <asm/pvr.h>

 static inline void __enable_icache_msr(void)
 {
 	__asm__ __volatile__ ("	 msrset	r0, %0;"	\
 				"nop;"			\
 			: : "i" (MSR_ICE) : "memory");
 }

 static inline void __disable_icache_msr(void)
 {
 	__asm__ __volatile__ ("	 msrclr	r0, %0;"	\
 				"nop;"			\
 			: : "i" (MSR_ICE) : "memory");
 }

 static inline void __enable_dcache_msr(void)
 {
 	__asm__ __volatile__ ("	 msrset	r0, %0;"	\
 				"nop;"			\
 			: : "i" (MSR_DCE) : "memory");
 }

 static inline void __disable_dcache_msr(void)
 {
 	__asm__ __volatile__ ("	 msrclr	r0, %0;"	\
 				"nop; "			\
 			: : "i" (MSR_DCE) : "memory");
 }

 static inline void __enable_icache_nomsr(void)
 {
 	__asm__ __volatile__ ("	 mfs	r12, rmsr;"	\
 				"nop;"			\
 				"ori	r12, r12, %0;"	\
 				"mts	rmsr, r12;"	\
 				"nop;"			\
 			: : "i" (MSR_ICE) : "memory", "r12");
 }

 static inline void __disable_icache_nomsr(void)
 {
 	__asm__ __volatile__ ("	 mfs	r12, rmsr;"	\
 				"nop;"			\
 				"andi	r12, r12, ~%0;"	\
 				"mts	rmsr, r12;"	\
 				"nop;"			\
 			: : "i" (MSR_ICE) : "memory", "r12");
 }

 static inline void __enable_dcache_nomsr(void)
 {
 	__asm__ __volatile__ ("	 mfs	r12, rmsr;"	\
 				"nop;"			\
 				"ori	r12, r12, %0;"	\
 				"mts	rmsr, r12;"	\
 				"nop;"			\
 			: : "i" (MSR_DCE) : "memory", "r12");
 }

 static inline void __disable_dcache_nomsr(void)
 {
 	__asm__ __volatile__ ("	 mfs	r12, rmsr;"	\
 				"nop;"			\
 				"andi	r12, r12, ~%0;"	\
 				"mts	rmsr, r12;"	\
 				"nop;"			\
 			: : "i" (MSR_DCE) : "memory", "r12");
 }


 /* Helper macro for computing the limits of cache range loops
  *
  * End address can be unaligned which is OK for C implementation.
  * ASM implementation align it in ASM macros
  */
 #define CACHE_LOOP_LIMITS(start, end, cache_line_length, cache_size)	\
 do {									\
 	int align = ~(cache_line_length - 1);				\
 	end = min(start + cache_size, end);				\
 	start &= align;							\
 } while (0)

 /*
  * Helper macro to loop over the specified cache_size/line_length and
  * execute 'op' on that cacheline
  */
 #define CACHE_ALL_LOOP(cache_size, line_length, op)			\
 do {									\
 	unsigned int len = cache_size - line_length;			\
 	int step = -line_length;					\
 	WARN_ON(step >= 0);						\
 									\
 	__asm__ __volatile__ (" 1:      " #op " %0, r0;"		\
 					"bgtid   %0, 1b;"		\
 					"addk    %0, %0, %1;"		\
 					: : "r" (len), "r" (step)	\
 					: "memory");			\
 } while (0)

 /* Used for wdc.flush/clear which can use rB for offset which is not possible
  * to use for simple wdc or wic.
  *
  * start address is cache aligned
  * end address is not aligned, if end is aligned then I have to subtract
  * cacheline length because I can't flush/invalidate the next cacheline.
  * If is not, I align it because I will flush/invalidate whole line.
  */
 #define CACHE_RANGE_LOOP_2(start, end, line_length, op)			\
 do {									\
 	int step = -line_length;					\
 	int align = ~(line_length - 1);					\
 	int count;							\
 	end = ((end & align) == end) ? end - line_length : end & align;	\
 	count = end - start;						\
 	WARN_ON(count < 0);						\
 									\
 	__asm__ __volatile__ (" 1:	" #op "	%0, %1;"		\
 					"bgtid	%1, 1b;"		\
 					"addk	%1, %1, %2;"		\
 					: : "r" (start), "r" (count),	\
 					"r" (step) : "memory");		\
 } while (0)

 /* It is used only first parameter for OP - for wic, wdc */
 #define CACHE_RANGE_LOOP_1(start, end, line_length, op)			\
 do {									\
 	unsigned int volatile temp = 0;						\
 	unsigned int align = ~(line_length - 1);					\
 	end = ((end & align) == end) ? end - line_length : end & align;	\
 	WARN_ON(end < start);					\
 									\
 	__asm__ __volatile__ (" 1:	" #op "	%1, r0;"		\
 					"cmpu	%0, %1, %2;"		\
 					"bgtid	%0, 1b;"		\
 					"addk	%1, %1, %3;"		\
 				: : "r" (temp), "r" (start), "r" (end),	\
 					"r" (line_length) : "memory");	\
 } while (0)

 #define ASM_LOOP

 static void __flush_icache_range_msr_irq(unsigned long start, unsigned long end)
 {
 	unsigned long flags;
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
 				(unsigned int)start, (unsigned int) end);

 	CACHE_LOOP_LIMITS(start, end,
 			cpuinfo.icache_line_length, cpuinfo.icache_size);

 	local_irq_save(flags);
 	__disable_icache_msr();

 #ifdef ASM_LOOP
 	CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
 #else
 	for (i = start; i < end; i += cpuinfo.icache_line_length)
 		__asm__ __volatile__ ("wic	%0, r0;"	\
 				: : "r" (i));
 #endif
 	__enable_icache_msr();
 	local_irq_restore(flags);
 }

 static void __flush_icache_range_nomsr_irq(unsigned long start,
 				unsigned long end)
 {
 	unsigned long flags;
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
 				(unsigned int)start, (unsigned int) end);

 	CACHE_LOOP_LIMITS(start, end,
 			cpuinfo.icache_line_length, cpuinfo.icache_size);

 	local_irq_save(flags);
 	__disable_icache_nomsr();

 #ifdef ASM_LOOP
 	CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
 #else
 	for (i = start; i < end; i += cpuinfo.icache_line_length)
 		__asm__ __volatile__ ("wic	%0, r0;"	\
 				: : "r" (i));
 #endif

 	__enable_icache_nomsr();
 	local_irq_restore(flags);
 }

 static void __flush_icache_range_noirq(unsigned long start,
 				unsigned long end)
 {
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
 				(unsigned int)start, (unsigned int) end);

 	CACHE_LOOP_LIMITS(start, end,
 			cpuinfo.icache_line_length, cpuinfo.icache_size);
 #ifdef ASM_LOOP
 	CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
 #else
 	for (i = start; i < end; i += cpuinfo.icache_line_length)
 		__asm__ __volatile__ ("wic	%0, r0;"	\
 				: : "r" (i));
 #endif
 }

 static void __flush_icache_all_msr_irq(void)
 {
 	unsigned long flags;
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s\n", __func__);

 	local_irq_save(flags);
 	__disable_icache_msr();
 #ifdef ASM_LOOP
 	CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
 #else
 	for (i = 0; i < cpuinfo.icache_size;
 		 i += cpuinfo.icache_line_length)
 			__asm__ __volatile__ ("wic	%0, r0;" \
 					: : "r" (i));
 #endif
 	__enable_icache_msr();
 	local_irq_restore(flags);
 }

 static void __flush_icache_all_nomsr_irq(void)
 {
 	unsigned long flags;
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s\n", __func__);

 	local_irq_save(flags);
 	__disable_icache_nomsr();
 #ifdef ASM_LOOP
 	CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
 #else
 	for (i = 0; i < cpuinfo.icache_size;
 		 i += cpuinfo.icache_line_length)
 			__asm__ __volatile__ ("wic	%0, r0;" \
 					: : "r" (i));
 #endif
 	__enable_icache_nomsr();
 	local_irq_restore(flags);
 }

 static void __flush_icache_all_noirq(void)
 {
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s\n", __func__);
 #ifdef ASM_LOOP
 	CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
 #else
 	for (i = 0; i < cpuinfo.icache_size;
 		 i += cpuinfo.icache_line_length)
 			__asm__ __volatile__ ("wic	%0, r0;" \
 					: : "r" (i));
 #endif
 }

 static void __invalidate_dcache_all_msr_irq(void)
 {
 	unsigned long flags;
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s\n", __func__);

 	local_irq_save(flags);
 	__disable_dcache_msr();
 #ifdef ASM_LOOP
 	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
 #else
 	for (i = 0; i < cpuinfo.dcache_size;
 		 i += cpuinfo.dcache_line_length)
 			__asm__ __volatile__ ("wdc	%0, r0;" \
 					: : "r" (i));
 #endif
 	__enable_dcache_msr();
 	local_irq_restore(flags);
 }

 static void __invalidate_dcache_all_nomsr_irq(void)
 {
 	unsigned long flags;
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s\n", __func__);

 	local_irq_save(flags);
 	__disable_dcache_nomsr();
 #ifdef ASM_LOOP
 	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
 #else
 	for (i = 0; i < cpuinfo.dcache_size;
 		 i += cpuinfo.dcache_line_length)
 			__asm__ __volatile__ ("wdc	%0, r0;" \
 					: : "r" (i));
 #endif
 	__enable_dcache_nomsr();
 	local_irq_restore(flags);
 }

 static void __invalidate_dcache_all_noirq_wt(void)
 {
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s\n", __func__);
 #ifdef ASM_LOOP
 	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
 #else
 	for (i = 0; i < cpuinfo.dcache_size;
 		 i += cpuinfo.dcache_line_length)
 			__asm__ __volatile__ ("wdc	%0, r0;" \
 					: : "r" (i));
 #endif
 }

 /*
  * FIXME It is blindly invalidation as is expected
  * but can't be called on noMMU in microblaze_cache_init below
  *
  * MS: noMMU kernel won't boot if simple wdc is used
  * The reason should be that there are discared data which kernel needs
  */
 static void __invalidate_dcache_all_wb(void)
 {
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s\n", __func__);
 #ifdef ASM_LOOP
 	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length,
 					wdc);
 #else
 	for (i = 0; i < cpuinfo.dcache_size;
 		 i += cpuinfo.dcache_line_length)
 			__asm__ __volatile__ ("wdc	%0, r0;" \
 					: : "r" (i));
 #endif
 }

 static void __invalidate_dcache_range_wb(unsigned long start,
 						unsigned long end)
 {
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
 				(unsigned int)start, (unsigned int) end);

 	CACHE_LOOP_LIMITS(start, end,
 			cpuinfo.dcache_line_length, cpuinfo.dcache_size);
 #ifdef ASM_LOOP
 	CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.clear);
 #else
 	for (i = start; i < end; i += cpuinfo.dcache_line_length)
 		__asm__ __volatile__ ("wdc.clear	%0, r0;"	\
 				: : "r" (i));
 #endif
 }

 static void __invalidate_dcache_range_nomsr_wt(unsigned long start,
 							unsigned long end)
 {
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
 				(unsigned int)start, (unsigned int) end);
 	CACHE_LOOP_LIMITS(start, end,
 			cpuinfo.dcache_line_length, cpuinfo.dcache_size);

 #ifdef ASM_LOOP
 	CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
 #else
 	for (i = start; i < end; i += cpuinfo.dcache_line_length)
 		__asm__ __volatile__ ("wdc	%0, r0;"	\
 				: : "r" (i));
 #endif
 }

 static void __invalidate_dcache_range_msr_irq_wt(unsigned long start,
 							unsigned long end)
 {
 	unsigned long flags;
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
 				(unsigned int)start, (unsigned int) end);
 	CACHE_LOOP_LIMITS(start, end,
 			cpuinfo.dcache_line_length, cpuinfo.dcache_size);

 	local_irq_save(flags);
 	__disable_dcache_msr();

 #ifdef ASM_LOOP
 	CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
 #else
 	for (i = start; i < end; i += cpuinfo.dcache_line_length)
 		__asm__ __volatile__ ("wdc	%0, r0;"	\
 				: : "r" (i));
 #endif

 	__enable_dcache_msr();
 	local_irq_restore(flags);
 }

 static void __invalidate_dcache_range_nomsr_irq(unsigned long start,
 							unsigned long end)
 {
 	unsigned long flags;
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
 				(unsigned int)start, (unsigned int) end);

 	CACHE_LOOP_LIMITS(start, end,
 			cpuinfo.dcache_line_length, cpuinfo.dcache_size);

 	local_irq_save(flags);
 	__disable_dcache_nomsr();

 #ifdef ASM_LOOP
 	CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
 #else
 	for (i = start; i < end; i += cpuinfo.dcache_line_length)
 		__asm__ __volatile__ ("wdc	%0, r0;"	\
 				: : "r" (i));
 #endif

 	__enable_dcache_nomsr();
 	local_irq_restore(flags);
 }

 static void __flush_dcache_all_wb(void)
 {
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s\n", __func__);
 #ifdef ASM_LOOP
 	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length,
 				wdc.flush);
 #else
 	for (i = 0; i < cpuinfo.dcache_size;
 		 i += cpuinfo.dcache_line_length)
 			__asm__ __volatile__ ("wdc.flush	%0, r0;" \
 					: : "r" (i));
 #endif
 }

 static void __flush_dcache_range_wb(unsigned long start, unsigned long end)
 {
 #ifndef ASM_LOOP
 	int i;
 #endif
 	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
 				(unsigned int)start, (unsigned int) end);

 	CACHE_LOOP_LIMITS(start, end,
 			cpuinfo.dcache_line_length, cpuinfo.dcache_size);
 #ifdef ASM_LOOP
 	CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.flush);
 #else
 	for (i = start; i < end; i += cpuinfo.dcache_line_length)
 		__asm__ __volatile__ ("wdc.flush	%0, r0;"	\
 				: : "r" (i));
 #endif
 }

 /* struct for wb caches and for wt caches */
 struct scache *mbc;

 /* new wb cache model */
 static const struct scache wb_msr = {
 	.ie = __enable_icache_msr,
 	.id = __disable_icache_msr,
 	.ifl = __flush_icache_all_noirq,
 	.iflr = __flush_icache_range_noirq,
 	.iin = __flush_icache_all_noirq,
 	.iinr = __flush_icache_range_noirq,
 	.de = __enable_dcache_msr,
 	.dd = __disable_dcache_msr,
 	.dfl = __flush_dcache_all_wb,
 	.dflr = __flush_dcache_range_wb,
 	.din = __invalidate_dcache_all_wb,
 	.dinr = __invalidate_dcache_range_wb,
 };

 /* There is only difference in ie, id, de, dd functions */
 static const struct scache wb_nomsr = {
 	.ie = __enable_icache_nomsr,
 	.id = __disable_icache_nomsr,
 	.ifl = __flush_icache_all_noirq,
 	.iflr = __flush_icache_range_noirq,
 	.iin = __flush_icache_all_noirq,
 	.iinr = __flush_icache_range_noirq,
 	.de = __enable_dcache_nomsr,
 	.dd = __disable_dcache_nomsr,
 	.dfl = __flush_dcache_all_wb,
 	.dflr = __flush_dcache_range_wb,
 	.din = __invalidate_dcache_all_wb,
 	.dinr = __invalidate_dcache_range_wb,
 };

 /* Old wt cache model with disabling irq and turn off cache */
 static const struct scache wt_msr = {
 	.ie = __enable_icache_msr,
 	.id = __disable_icache_msr,
 	.ifl = __flush_icache_all_msr_irq,
 	.iflr = __flush_icache_range_msr_irq,
 	.iin = __flush_icache_all_msr_irq,
 	.iinr = __flush_icache_range_msr_irq,
 	.de = __enable_dcache_msr,
 	.dd = __disable_dcache_msr,
 	.dfl = __invalidate_dcache_all_msr_irq,
 	.dflr = __invalidate_dcache_range_msr_irq_wt,
 	.din = __invalidate_dcache_all_msr_irq,
 	.dinr = __invalidate_dcache_range_msr_irq_wt,
 };

 static const struct scache wt_nomsr = {
 	.ie = __enable_icache_nomsr,
 	.id = __disable_icache_nomsr,
 	.ifl = __flush_icache_all_nomsr_irq,
 	.iflr = __flush_icache_range_nomsr_irq,
 	.iin = __flush_icache_all_nomsr_irq,
 	.iinr = __flush_icache_range_nomsr_irq,
 	.de = __enable_dcache_nomsr,
 	.dd = __disable_dcache_nomsr,
 	.dfl = __invalidate_dcache_all_nomsr_irq,
 	.dflr = __invalidate_dcache_range_nomsr_irq,
 	.din = __invalidate_dcache_all_nomsr_irq,
 	.dinr = __invalidate_dcache_range_nomsr_irq,
 };

 /* New wt cache model for newer Microblaze versions */
 static const struct scache wt_msr_noirq = {
 	.ie = __enable_icache_msr,
 	.id = __disable_icache_msr,
 	.ifl = __flush_icache_all_noirq,
 	.iflr = __flush_icache_range_noirq,
 	.iin = __flush_icache_all_noirq,
 	.iinr = __flush_icache_range_noirq,
 	.de = __enable_dcache_msr,
 	.dd = __disable_dcache_msr,
 	.dfl = __invalidate_dcache_all_noirq_wt,
 	.dflr = __invalidate_dcache_range_nomsr_wt,
 	.din = __invalidate_dcache_all_noirq_wt,
 	.dinr = __invalidate_dcache_range_nomsr_wt,
 };

 static const struct scache wt_nomsr_noirq = {
 	.ie = __enable_icache_nomsr,
 	.id = __disable_icache_nomsr,
 	.ifl = __flush_icache_all_noirq,
 	.iflr = __flush_icache_range_noirq,
 	.iin = __flush_icache_all_noirq,
 	.iinr = __flush_icache_range_noirq,
 	.de = __enable_dcache_nomsr,
 	.dd = __disable_dcache_nomsr,
 	.dfl = __invalidate_dcache_all_noirq_wt,
 	.dflr = __invalidate_dcache_range_nomsr_wt,
 	.din = __invalidate_dcache_all_noirq_wt,
 	.dinr = __invalidate_dcache_range_nomsr_wt,
 };

 /* CPU version code for 7.20.c - see arch/microblaze/kernel/cpu/cpuinfo.c */
 #define CPUVER_7_20_A	0x0c
 #define CPUVER_7_20_D	0x0f

 void microblaze_cache_init(void)
 {
 	if (cpuinfo.use_instr & PVR2_USE_MSR_INSTR) {
 		if (cpuinfo.dcache_wb) {
 			pr_info("wb_msr\n");
 			mbc = (struct scache *)&wb_msr;
 			if (cpuinfo.ver_code <= CPUVER_7_20_D) {
 				/* MS: problem with signal handling - hw bug */
 				pr_info("WB won't work properly\n");
 			}
 		} else {
 			if (cpuinfo.ver_code >= CPUVER_7_20_A) {
 				pr_info("wt_msr_noirq\n");
 				mbc = (struct scache *)&wt_msr_noirq;
 			} else {
 				pr_info("wt_msr\n");
 				mbc = (struct scache *)&wt_msr;
 			}
 		}
 	} else {
 		if (cpuinfo.dcache_wb) {
 			pr_info("wb_nomsr\n");
 			mbc = (struct scache *)&wb_nomsr;
 			if (cpuinfo.ver_code <= CPUVER_7_20_D) {
 				/* MS: problem with signal handling - hw bug */
 				pr_info("WB won't work properly\n");
 			}
 		} else {
 			if (cpuinfo.ver_code >= CPUVER_7_20_A) {
 				pr_info("wt_nomsr_noirq\n");
 				mbc = (struct scache *)&wt_nomsr_noirq;
 			} else {
 				pr_info("wt_nomsr\n");
 				mbc = (struct scache *)&wt_nomsr;
 			}
 		}
 	}
 	/*
 	 * FIXME Invalidation is done in U-BOOT
 	 * WT cache: Data is already written to main memory
 	 * WB cache: Discard data on noMMU which caused that kernel doesn't boot
 	 */
 	/* invalidate_dcache(); */
 	enable_dcache();

 	invalidate_icache();
 	enable_icache();
 }
	/*
	* Cache control for MicroBlaze cache memories
	*
	* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
	* Copyright (C) 2007-2009 PetaLogix
	* Copyright (C) 2007-2009 John Williams <john.williams@petalogix.com>
	*
	* This file is subject to the terms and conditions of the GNU General
	* Public License. See the file COPYING in the main directory of this
	* archive for more details.
	*/

	#include <asm/cacheflush.h>
	#include <linux/cache.h>
	#include <asm/cpuinfo.h>
	#include <asm/pvr.h>

	static inline void __enable_icache_msr(void)
	{
	__asm__ __volatile__ (" msrset r0, %0;" \
	"nop;" \
	: : "i" (MSR_ICE) : "memory");
	}

	static inline void __disable_icache_msr(void)
	{
	__asm__ __volatile__ (" msrclr r0, %0;" \
	"nop;" \
	: : "i" (MSR_ICE) : "memory");
	}

	static inline void __enable_dcache_msr(void)
	{
	__asm__ __volatile__ (" msrset r0, %0;" \
	"nop;" \
	: : "i" (MSR_DCE) : "memory");
	}

	static inline void __disable_dcache_msr(void)
	{
	__asm__ __volatile__ (" msrclr r0, %0;" \
	"nop; " \
	: : "i" (MSR_DCE) : "memory");
	}

	static inline void __enable_icache_nomsr(void)
	{
	__asm__ __volatile__ (" mfs r12, rmsr;" \
	"nop;" \
	"ori r12, r12, %0;" \
	"mts rmsr, r12;" \
	"nop;" \
	: : "i" (MSR_ICE) : "memory", "r12");
	}

	static inline void __disable_icache_nomsr(void)
	{
	__asm__ __volatile__ (" mfs r12, rmsr;" \
	"nop;" \
	"andi r12, r12, ~%0;" \
	"mts rmsr, r12;" \
	"nop;" \
	: : "i" (MSR_ICE) : "memory", "r12");
	}

	static inline void __enable_dcache_nomsr(void)
	{
	__asm__ __volatile__ (" mfs r12, rmsr;" \
	"nop;" \
	"ori r12, r12, %0;" \
	"mts rmsr, r12;" \
	"nop;" \
	: : "i" (MSR_DCE) : "memory", "r12");
	}

	static inline void __disable_dcache_nomsr(void)
	{
	__asm__ __volatile__ (" mfs r12, rmsr;" \
	"nop;" \
	"andi r12, r12, ~%0;" \
	"mts rmsr, r12;" \
	"nop;" \
	: : "i" (MSR_DCE) : "memory", "r12");
	}


	/* Helper macro for computing the limits of cache range loops
	*
	* End address can be unaligned which is OK for C implementation.
	* ASM implementation align it in ASM macros
	*/
	#define CACHE_LOOP_LIMITS(start, end, cache_line_length, cache_size) \
	do { \
	int align = ~(cache_line_length - 1); \
	end = min(start + cache_size, end); \
	start &= align; \
	} while (0)

	/*
	* Helper macro to loop over the specified cache_size/line_length and
	* execute 'op' on that cacheline
	*/
	#define CACHE_ALL_LOOP(cache_size, line_length, op) \
	do { \
	unsigned int len = cache_size - line_length; \
	int step = -line_length; \
	WARN_ON(step >= 0); \
	\
	__asm__ __volatile__ (" 1: " #op " %0, r0;" \
	"bgtid %0, 1b;" \
	"addk %0, %0, %1;" \
	: : "r" (len), "r" (step) \
	: "memory"); \
	} while (0)

	/* Used for wdc.flush/clear which can use rB for offset which is not possible
	* to use for simple wdc or wic.
	*
	* start address is cache aligned
	* end address is not aligned, if end is aligned then I have to subtract
	* cacheline length because I can't flush/invalidate the next cacheline.
	* If is not, I align it because I will flush/invalidate whole line.
	*/
	#define CACHE_RANGE_LOOP_2(start, end, line_length, op) \
	do { \
	int step = -line_length; \
	int align = ~(line_length - 1); \
	int count; \
	end = ((end & align) == end) ? end - line_length : end & align; \
	count = end - start; \
	WARN_ON(count < 0); \
	\
	__asm__ __volatile__ (" 1: " #op " %0, %1;" \
	"bgtid %1, 1b;" \
	"addk %1, %1, %2;" \
	: : "r" (start), "r" (count), \
	"r" (step) : "memory"); \
	} while (0)

	/* It is used only first parameter for OP - for wic, wdc */
	#define CACHE_RANGE_LOOP_1(start, end, line_length, op) \
	do { \
	unsigned int volatile temp = 0; \
	unsigned int align = ~(line_length - 1); \
	end = ((end & align) == end) ? end - line_length : end & align; \
	WARN_ON(end < start); \
	\
	__asm__ __volatile__ (" 1: " #op " %1, r0;" \
	"cmpu %0, %1, %2;" \
	"bgtid %0, 1b;" \
	"addk %1, %1, %3;" \
	: : "r" (temp), "r" (start), "r" (end), \
	"r" (line_length) : "memory"); \
	} while (0)

	#define ASM_LOOP

	static void __flush_icache_range_msr_irq(unsigned long start, unsigned long end)
	{
	unsigned long flags;
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
	(unsigned int)start, (unsigned int) end);

	CACHE_LOOP_LIMITS(start, end,
	cpuinfo.icache_line_length, cpuinfo.icache_size);

	local_irq_save(flags);
	__disable_icache_msr();

	#ifdef ASM_LOOP
	CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
	#else
	for (i = start; i < end; i += cpuinfo.icache_line_length)
	__asm__ __volatile__ ("wic %0, r0;" \
	: : "r" (i));
	#endif
	__enable_icache_msr();
	local_irq_restore(flags);
	}

	static void __flush_icache_range_nomsr_irq(unsigned long start,
	unsigned long end)
	{
	unsigned long flags;
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
	(unsigned int)start, (unsigned int) end);

	CACHE_LOOP_LIMITS(start, end,
	cpuinfo.icache_line_length, cpuinfo.icache_size);

	local_irq_save(flags);
	__disable_icache_nomsr();

	#ifdef ASM_LOOP
	CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
	#else
	for (i = start; i < end; i += cpuinfo.icache_line_length)
	__asm__ __volatile__ ("wic %0, r0;" \
	: : "r" (i));
	#endif

	__enable_icache_nomsr();
	local_irq_restore(flags);
	}

	static void __flush_icache_range_noirq(unsigned long start,
	unsigned long end)
	{
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
	(unsigned int)start, (unsigned int) end);

	CACHE_LOOP_LIMITS(start, end,
	cpuinfo.icache_line_length, cpuinfo.icache_size);
	#ifdef ASM_LOOP
	CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
	#else
	for (i = start; i < end; i += cpuinfo.icache_line_length)
	__asm__ __volatile__ ("wic %0, r0;" \
	: : "r" (i));
	#endif
	}

	static void __flush_icache_all_msr_irq(void)
	{
	unsigned long flags;
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s\n", __func__);

	local_irq_save(flags);
	__disable_icache_msr();
	#ifdef ASM_LOOP
	CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
	#else
	for (i = 0; i < cpuinfo.icache_size;
	i += cpuinfo.icache_line_length)
	__asm__ __volatile__ ("wic %0, r0;" \
	: : "r" (i));
	#endif
	__enable_icache_msr();
	local_irq_restore(flags);
	}

	static void __flush_icache_all_nomsr_irq(void)
	{
	unsigned long flags;
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s\n", __func__);

	local_irq_save(flags);
	__disable_icache_nomsr();
	#ifdef ASM_LOOP
	CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
	#else
	for (i = 0; i < cpuinfo.icache_size;
	i += cpuinfo.icache_line_length)
	__asm__ __volatile__ ("wic %0, r0;" \
	: : "r" (i));
	#endif
	__enable_icache_nomsr();
	local_irq_restore(flags);
	}

	static void __flush_icache_all_noirq(void)
	{
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s\n", __func__);
	#ifdef ASM_LOOP
	CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
	#else
	for (i = 0; i < cpuinfo.icache_size;
	i += cpuinfo.icache_line_length)
	__asm__ __volatile__ ("wic %0, r0;" \
	: : "r" (i));
	#endif
	}

	static void __invalidate_dcache_all_msr_irq(void)
	{
	unsigned long flags;
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s\n", __func__);

	local_irq_save(flags);
	__disable_dcache_msr();
	#ifdef ASM_LOOP
	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
	#else
	for (i = 0; i < cpuinfo.dcache_size;
	i += cpuinfo.dcache_line_length)
	__asm__ __volatile__ ("wdc %0, r0;" \
	: : "r" (i));
	#endif
	__enable_dcache_msr();
	local_irq_restore(flags);
	}

	static void __invalidate_dcache_all_nomsr_irq(void)
	{
	unsigned long flags;
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s\n", __func__);

	local_irq_save(flags);
	__disable_dcache_nomsr();
	#ifdef ASM_LOOP
	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
	#else
	for (i = 0; i < cpuinfo.dcache_size;
	i += cpuinfo.dcache_line_length)
	__asm__ __volatile__ ("wdc %0, r0;" \
	: : "r" (i));
	#endif
	__enable_dcache_nomsr();
	local_irq_restore(flags);
	}

	static void __invalidate_dcache_all_noirq_wt(void)
	{
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s\n", __func__);
	#ifdef ASM_LOOP
	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
	#else
	for (i = 0; i < cpuinfo.dcache_size;
	i += cpuinfo.dcache_line_length)
	__asm__ __volatile__ ("wdc %0, r0;" \
	: : "r" (i));
	#endif
	}

	/*
	* FIXME It is blindly invalidation as is expected
	* but can't be called on noMMU in microblaze_cache_init below
	*
	* MS: noMMU kernel won't boot if simple wdc is used
	* The reason should be that there are discared data which kernel needs
	*/
	static void __invalidate_dcache_all_wb(void)
	{
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s\n", __func__);
	#ifdef ASM_LOOP
	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length,
	wdc);
	#else
	for (i = 0; i < cpuinfo.dcache_size;
	i += cpuinfo.dcache_line_length)
	__asm__ __volatile__ ("wdc %0, r0;" \
	: : "r" (i));
	#endif
	}

	static void __invalidate_dcache_range_wb(unsigned long start,
	unsigned long end)
	{
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
	(unsigned int)start, (unsigned int) end);

	CACHE_LOOP_LIMITS(start, end,
	cpuinfo.dcache_line_length, cpuinfo.dcache_size);
	#ifdef ASM_LOOP
	CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.clear);
	#else
	for (i = start; i < end; i += cpuinfo.dcache_line_length)
	__asm__ __volatile__ ("wdc.clear %0, r0;" \
	: : "r" (i));
	#endif
	}

	static void __invalidate_dcache_range_nomsr_wt(unsigned long start,
	unsigned long end)
	{
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
	(unsigned int)start, (unsigned int) end);
	CACHE_LOOP_LIMITS(start, end,
	cpuinfo.dcache_line_length, cpuinfo.dcache_size);

	#ifdef ASM_LOOP
	CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
	#else
	for (i = start; i < end; i += cpuinfo.dcache_line_length)
	__asm__ __volatile__ ("wdc %0, r0;" \
	: : "r" (i));
	#endif
	}

	static void __invalidate_dcache_range_msr_irq_wt(unsigned long start,
	unsigned long end)
	{
	unsigned long flags;
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
	(unsigned int)start, (unsigned int) end);
	CACHE_LOOP_LIMITS(start, end,
	cpuinfo.dcache_line_length, cpuinfo.dcache_size);

	local_irq_save(flags);
	__disable_dcache_msr();

	#ifdef ASM_LOOP
	CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
	#else
	for (i = start; i < end; i += cpuinfo.dcache_line_length)
	__asm__ __volatile__ ("wdc %0, r0;" \
	: : "r" (i));
	#endif

	__enable_dcache_msr();
	local_irq_restore(flags);
	}

	static void __invalidate_dcache_range_nomsr_irq(unsigned long start,
	unsigned long end)
	{
	unsigned long flags;
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
	(unsigned int)start, (unsigned int) end);

	CACHE_LOOP_LIMITS(start, end,
	cpuinfo.dcache_line_length, cpuinfo.dcache_size);

	local_irq_save(flags);
	__disable_dcache_nomsr();

	#ifdef ASM_LOOP
	CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
	#else
	for (i = start; i < end; i += cpuinfo.dcache_line_length)
	__asm__ __volatile__ ("wdc %0, r0;" \
	: : "r" (i));
	#endif

	__enable_dcache_nomsr();
	local_irq_restore(flags);
	}

	static void __flush_dcache_all_wb(void)
	{
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s\n", __func__);
	#ifdef ASM_LOOP
	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length,
	wdc.flush);
	#else
	for (i = 0; i < cpuinfo.dcache_size;
	i += cpuinfo.dcache_line_length)
	__asm__ __volatile__ ("wdc.flush %0, r0;" \
	: : "r" (i));
	#endif
	}

	static void __flush_dcache_range_wb(unsigned long start, unsigned long end)
	{
	#ifndef ASM_LOOP
	int i;
	#endif
	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
	(unsigned int)start, (unsigned int) end);

	CACHE_LOOP_LIMITS(start, end,
	cpuinfo.dcache_line_length, cpuinfo.dcache_size);
	#ifdef ASM_LOOP
	CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.flush);
	#else
	for (i = start; i < end; i += cpuinfo.dcache_line_length)
	__asm__ __volatile__ ("wdc.flush %0, r0;" \
	: : "r" (i));
	#endif
	}

	/* struct for wb caches and for wt caches */
	struct scache *mbc;

	/* new wb cache model */
	static const struct scache wb_msr = {
	.ie = __enable_icache_msr,
	.id = __disable_icache_msr,
	.ifl = __flush_icache_all_noirq,
	.iflr = __flush_icache_range_noirq,
	.iin = __flush_icache_all_noirq,
	.iinr = __flush_icache_range_noirq,
	.de = __enable_dcache_msr,
	.dd = __disable_dcache_msr,
	.dfl = __flush_dcache_all_wb,
	.dflr = __flush_dcache_range_wb,
	.din = __invalidate_dcache_all_wb,
	.dinr = __invalidate_dcache_range_wb,
	};

	/* There is only difference in ie, id, de, dd functions */
	static const struct scache wb_nomsr = {
	.ie = __enable_icache_nomsr,
	.id = __disable_icache_nomsr,
	.ifl = __flush_icache_all_noirq,
	.iflr = __flush_icache_range_noirq,
	.iin = __flush_icache_all_noirq,
	.iinr = __flush_icache_range_noirq,
	.de = __enable_dcache_nomsr,
	.dd = __disable_dcache_nomsr,
	.dfl = __flush_dcache_all_wb,
	.dflr = __flush_dcache_range_wb,
	.din = __invalidate_dcache_all_wb,
	.dinr = __invalidate_dcache_range_wb,
	};

	/* Old wt cache model with disabling irq and turn off cache */
	static const struct scache wt_msr = {
	.ie = __enable_icache_msr,
	.id = __disable_icache_msr,
	.ifl = __flush_icache_all_msr_irq,
	.iflr = __flush_icache_range_msr_irq,
	.iin = __flush_icache_all_msr_irq,
	.iinr = __flush_icache_range_msr_irq,
	.de = __enable_dcache_msr,
	.dd = __disable_dcache_msr,
	.dfl = __invalidate_dcache_all_msr_irq,
	.dflr = __invalidate_dcache_range_msr_irq_wt,
	.din = __invalidate_dcache_all_msr_irq,
	.dinr = __invalidate_dcache_range_msr_irq_wt,
	};

	static const struct scache wt_nomsr = {
	.ie = __enable_icache_nomsr,
	.id = __disable_icache_nomsr,
	.ifl = __flush_icache_all_nomsr_irq,
	.iflr = __flush_icache_range_nomsr_irq,
	.iin = __flush_icache_all_nomsr_irq,
	.iinr = __flush_icache_range_nomsr_irq,
	.de = __enable_dcache_nomsr,
	.dd = __disable_dcache_nomsr,
	.dfl = __invalidate_dcache_all_nomsr_irq,
	.dflr = __invalidate_dcache_range_nomsr_irq,
	.din = __invalidate_dcache_all_nomsr_irq,
	.dinr = __invalidate_dcache_range_nomsr_irq,
	};

	/* New wt cache model for newer Microblaze versions */
	static const struct scache wt_msr_noirq = {
	.ie = __enable_icache_msr,
	.id = __disable_icache_msr,
	.ifl = __flush_icache_all_noirq,
	.iflr = __flush_icache_range_noirq,
	.iin = __flush_icache_all_noirq,
	.iinr = __flush_icache_range_noirq,
	.de = __enable_dcache_msr,
	.dd = __disable_dcache_msr,
	.dfl = __invalidate_dcache_all_noirq_wt,
	.dflr = __invalidate_dcache_range_nomsr_wt,
	.din = __invalidate_dcache_all_noirq_wt,
	.dinr = __invalidate_dcache_range_nomsr_wt,
	};

	static const struct scache wt_nomsr_noirq = {
	.ie = __enable_icache_nomsr,
	.id = __disable_icache_nomsr,
	.ifl = __flush_icache_all_noirq,
	.iflr = __flush_icache_range_noirq,
	.iin = __flush_icache_all_noirq,
	.iinr = __flush_icache_range_noirq,
	.de = __enable_dcache_nomsr,
	.dd = __disable_dcache_nomsr,
	.dfl = __invalidate_dcache_all_noirq_wt,
	.dflr = __invalidate_dcache_range_nomsr_wt,
	.din = __invalidate_dcache_all_noirq_wt,
	.dinr = __invalidate_dcache_range_nomsr_wt,
	};

	/* CPU version code for 7.20.c - see arch/microblaze/kernel/cpu/cpuinfo.c */
	#define CPUVER_7_20_A 0x0c
	#define CPUVER_7_20_D 0x0f

	void microblaze_cache_init(void)
	{
	if (cpuinfo.use_instr & PVR2_USE_MSR_INSTR) {
	if (cpuinfo.dcache_wb) {
	pr_info("wb_msr\n");
	mbc = (struct scache *)&wb_msr;
	if (cpuinfo.ver_code <= CPUVER_7_20_D) {
	/* MS: problem with signal handling - hw bug */
	pr_info("WB won't work properly\n");
	}
	} else {
	if (cpuinfo.ver_code >= CPUVER_7_20_A) {
	pr_info("wt_msr_noirq\n");
	mbc = (struct scache *)&wt_msr_noirq;
	} else {
	pr_info("wt_msr\n");
	mbc = (struct scache *)&wt_msr;
	}
	}
	} else {
	if (cpuinfo.dcache_wb) {
	pr_info("wb_nomsr\n");
	mbc = (struct scache *)&wb_nomsr;
	if (cpuinfo.ver_code <= CPUVER_7_20_D) {
	/* MS: problem with signal handling - hw bug */
	pr_info("WB won't work properly\n");
	}
	} else {
	if (cpuinfo.ver_code >= CPUVER_7_20_A) {
	pr_info("wt_nomsr_noirq\n");
	mbc = (struct scache *)&wt_nomsr_noirq;
	} else {
	pr_info("wt_nomsr\n");
	mbc = (struct scache *)&wt_nomsr;
	}
	}
	}
	/*
	* FIXME Invalidation is done in U-BOOT
	* WT cache: Data is already written to main memory
	* WB cache: Discard data on noMMU which caused that kernel doesn't boot
	*/
	/* invalidate_dcache(); */
	enable_dcache();

	invalidate_icache();
	enable_icache();
	}