arm: Replace v7_maint_dcache_all(ARMV7_DCACHE_INVAL_ALL) with asm code

Lets be consistent and also replace v7_maint_dcache_all()
with asm code for the invalidate case.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

arch/arm/cpu/armv7/cache_v7.c

@@ -10,15 +10,14 @@
 #include <asm/armv7.h>
 #include <asm/utils.h>
 
-#define ARMV7_DCACHE_INVAL_ALL		1
-#define ARMV7_DCACHE_CLEAN_INVAL_ALL	2
-#define ARMV7_DCACHE_INVAL_RANGE	3
-#define ARMV7_DCACHE_CLEAN_INVAL_RANGE	4
+#define ARMV7_DCACHE_INVAL_RANGE	1
+#define ARMV7_DCACHE_CLEAN_INVAL_RANGE	2
 
 #ifndef CONFIG_SYS_DCACHE_OFF
 
 /* Asm functions from cache_v7_asm.S */
 void v7_flush_dcache_all(void);
+void v7_invalidate_dcache_all(void);
 
 static int check_cache_range(unsigned long start, unsigned long stop)
 {
@@ -37,18 +36,6 @@ static int check_cache_range(unsigned long start, unsigned long stop)
 	return ok;
 }
 
-/*
- * Write the level and type you want to Cache Size Selection Register(CSSELR)
- * to get size details from Current Cache Size ID Register(CCSIDR)
- */
-static void set_csselr(u32 level, u32 type)
-{
-	u32 csselr = level << 1 | type;
-
-	/* Write to Cache Size Selection Register(CSSELR) */
-	asm volatile ("mcr p15, 2, %0, c0, c0, 0" : : "r" (csselr));
-}
-
 static u32 get_ccsidr(void)
 {
 	u32 ccsidr;
@@ -58,85 +45,6 @@ static u32 get_ccsidr(void)
 	return ccsidr;
 }
 
-static u32 get_clidr(void)
-{
-	u32 clidr;
-
-	/* Read current CP15 Cache Level ID Register */
-	asm volatile ("mrc p15,1,%0,c0,c0,1" : "=r" (clidr));
-	return clidr;
-}
-
-static void v7_inval_dcache_level_setway(u32 level, u32 num_sets,
-					 u32 num_ways, u32 way_shift,
-					 u32 log2_line_len)
-{
-	int way, set;
-	u32 setway;
-
-	/*
-	 * For optimal assembly code:
-	 *	a. count down
-	 *	b. have bigger loop inside
-	 */
-	for (way = num_ways - 1; way >= 0 ; way--) {
-		for (set = num_sets - 1; set >= 0; set--) {
-			setway = (level << 1) | (set << log2_line_len) |
-				 (way << way_shift);
-			/* Invalidate data/unified cache line by set/way */
-			asm volatile ("	mcr p15, 0, %0, c7, c6, 2"
-					: : "r" (setway));
-		}
-	}
-	/* DSB to make sure the operation is complete */
-	DSB;
-}
-
-static void v7_maint_dcache_level_setway(u32 level, u32 operation)
-{
-	u32 ccsidr;
-	u32 num_sets, num_ways, log2_line_len, log2_num_ways;
-	u32 way_shift;
-
-	set_csselr(level, ARMV7_CSSELR_IND_DATA_UNIFIED);
-
-	ccsidr = get_ccsidr();
-
-	log2_line_len = ((ccsidr & CCSIDR_LINE_SIZE_MASK) >>
-				CCSIDR_LINE_SIZE_OFFSET) + 2;
-	/* Converting from words to bytes */
-	log2_line_len += 2;
-
-	num_ways  = ((ccsidr & CCSIDR_ASSOCIATIVITY_MASK) >>
-			CCSIDR_ASSOCIATIVITY_OFFSET) + 1;
-	num_sets  = ((ccsidr & CCSIDR_NUM_SETS_MASK) >>
-			CCSIDR_NUM_SETS_OFFSET) + 1;
-	/*
-	 * According to ARMv7 ARM number of sets and number of ways need
-	 * not be a power of 2
-	 */
-	log2_num_ways = log_2_n_round_up(num_ways);
-
-	way_shift = (32 - log2_num_ways);
-	v7_inval_dcache_level_setway(level, num_sets, num_ways,
-				      way_shift, log2_line_len);
-}
-
-static void v7_maint_dcache_all(u32 operation)
-{
-	u32 level, cache_type, level_start_bit = 0;
-	u32 clidr = get_clidr();
-
-	for (level = 0; level < 7; level++) {
-		cache_type = (clidr >> level_start_bit) & 0x7;
-		if ((cache_type == ARMV7_CLIDR_CTYPE_DATA_ONLY) ||
-		    (cache_type == ARMV7_CLIDR_CTYPE_INSTRUCTION_DATA) ||
-		    (cache_type == ARMV7_CLIDR_CTYPE_UNIFIED))
-			v7_maint_dcache_level_setway(level, operation);
-		level_start_bit += 3;
-	}
-}
-
 static void v7_dcache_clean_inval_range(u32 start, u32 stop, u32 line_len)
 {
 	u32 mva;
@@ -223,7 +131,7 @@ static void v7_inval_tlb(void)
 
 void invalidate_dcache_all(void)
 {
-	v7_maint_dcache_all(ARMV7_DCACHE_INVAL_ALL);
+	v7_invalidate_dcache_all();
 
 	v7_outer_cache_inval_all();
 }

arch/arm/cpu/armv7/cache_v7_asm.S

@@ -82,3 +82,73 @@ ENTRY(v7_flush_dcache_all)
  THUMB(	ldmfd	sp!, {r4-r7, r9-r11, lr}	)
 	bx	lr
 ENDPROC(v7_flush_dcache_all)
+
+/*
+ *	v7_invalidate_dcache_all()
+ *
+ *	Invalidate the whole D-cache.
+ *
+ *	Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode)
+ *
+ *	Note: copied from __v7_flush_dcache_all above with
+ *	mcr     p15, 0, r11, c7, c14, 2
+ *	Replaced with:
+ *	mcr     p15, 0, r11, c7, c6, 2
+ */
+ENTRY(__v7_invalidate_dcache_all)
+	dmb					@ ensure ordering with previous memory accesses
+	mrc	p15, 1, r0, c0, c0, 1		@ read clidr
+	mov	r3, r0, lsr #23			@ move LoC into position
+	ands	r3, r3, #7 << 1			@ extract LoC*2 from clidr
+	beq	inval_finished			@ if loc is 0, then no need to clean
+	mov	r10, #0				@ start clean at cache level 0
+inval_levels:
+	add	r2, r10, r10, lsr #1		@ work out 3x current cache level
+	mov	r1, r0, lsr r2			@ extract cache type bits from clidr
+	and	r1, r1, #7			@ mask of the bits for current cache only
+	cmp	r1, #2				@ see what cache we have at this level
+	blt	inval_skip			@ skip if no cache, or just i-cache
+	mcr	p15, 2, r10, c0, c0, 0		@ select current cache level in cssr
+	isb					@ isb to sych the new cssr&csidr
+	mrc	p15, 1, r1, c0, c0, 0		@ read the new csidr
+	and	r2, r1, #7			@ extract the length of the cache lines
+	add	r2, r2, #4			@ add 4 (line length offset)
+	movw	r4, #0x3ff
+	ands	r4, r4, r1, lsr #3		@ find maximum number on the way size
+	clz	r5, r4				@ find bit position of way size increment
+	movw	r7, #0x7fff
+	ands	r7, r7, r1, lsr #13		@ extract max number of the index size
+inval_loop1:
+	mov	r9, r7				@ create working copy of max index
+inval_loop2:
+ ARM(	orr	r11, r10, r4, lsl r5	)	@ factor way and cache number into r11
+ THUMB(	lsl	r6, r4, r5		)
+ THUMB(	orr	r11, r10, r6		)	@ factor way and cache number into r11
+ ARM(	orr	r11, r11, r9, lsl r2	)	@ factor index number into r11
+ THUMB(	lsl	r6, r9, r2		)
+ THUMB(	orr	r11, r11, r6		)	@ factor index number into r11
+	mcr	p15, 0, r11, c7, c6, 2		@ invalidate by set/way
+	subs	r9, r9, #1			@ decrement the index
+	bge	inval_loop2
+	subs	r4, r4, #1			@ decrement the way
+	bge	inval_loop1
+inval_skip:
+	add	r10, r10, #2			@ increment cache number
+	cmp	r3, r10
+	bgt	inval_levels
+inval_finished:
+	mov	r10, #0				@ swith back to cache level 0
+	mcr	p15, 2, r10, c0, c0, 0		@ select current cache level in cssr
+	dsb	st
+	isb
+	bx	lr
+ENDPROC(__v7_invalidate_dcache_all)
+
+ENTRY(v7_invalidate_dcache_all)
+ ARM(	stmfd	sp!, {r4-r5, r7, r9-r11, lr}	)
+ THUMB(	stmfd	sp!, {r4-r7, r9-r11, lr}	)
+	bl	__v7_invalidate_dcache_all
+ ARM(	ldmfd	sp!, {r4-r5, r7, r9-r11, lr}	)
+ THUMB(	ldmfd	sp!, {r4-r7, r9-r11, lr}	)
+	bx	lr
+ENDPROC(v7_invalidate_dcache_all)