[U-Boot] [PATCH 2/2] arm: Replace v7_maint_dcache_all(ARMV7_DCACHE_INVAL_ALL) with asm code
Hans de Goede
hdegoede at redhat.com
Mon Apr 4 20:31:49 CEST 2016
Lets be consistent and also replace v7_maint_dcache_all()
with asm code for the invalidate case.
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
arch/arm/cpu/armv7/cache_v7.c | 100 ++------------------------------------
arch/arm/cpu/armv7/cache_v7_asm.S | 70 ++++++++++++++++++++++++++
2 files changed, 74 insertions(+), 96 deletions(-)
diff --git a/arch/arm/cpu/armv7/cache_v7.c b/arch/arm/cpu/armv7/cache_v7.c
index dd07ba1..dc309da 100644
--- a/arch/arm/cpu/armv7/cache_v7.c
+++ b/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();
}
diff --git a/arch/arm/cpu/armv7/cache_v7_asm.S b/arch/arm/cpu/armv7/cache_v7_asm.S
index 1b1daf8..e47571f 100644
--- a/arch/arm/cpu/armv7/cache_v7_asm.S
+++ b/arch/arm/cpu/armv7/cache_v7_asm.S
@@ -83,3 +83,73 @@ 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)
--
2.7.3
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