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Subject[PATCH 04/19] ARC: untangle cache flush loop
Date
- Remove the ifdef'ery and write distinct versions for each mmu ver even
if there is some code duplication

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
arch/arc/mm/cache.c | 80 ++++++++++++++++++++++++++++++++++++-----------------
1 file changed, 55 insertions(+), 25 deletions(-)

diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c
index 7ff54d024b11..2db777a5d926 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -140,25 +140,19 @@ dc_chk:
* "tag" bits are provided in PTAG, index bits in existing IVIL/IVDL/FLDL regs
*/

-static inline void __cache_line_loop(unsigned long paddr, unsigned long vaddr,
- unsigned long sz, const int op)
+static inline
+void __cache_line_loop_v2(unsigned long paddr, unsigned long vaddr,
+ unsigned long sz, const int op)
{
- unsigned int aux_cmd, aux_tag;
+ unsigned int aux_cmd;
int num_lines;
- const int full_page_op = __builtin_constant_p(sz) && sz == PAGE_SIZE;
+ const int full_page = __builtin_constant_p(sz) && sz == PAGE_SIZE;

if (op == OP_INV_IC) {
aux_cmd = ARC_REG_IC_IVIL;
-#if (CONFIG_ARC_MMU_VER > 2)
- aux_tag = ARC_REG_IC_PTAG;
-#endif
- }
- else {
+ } else {
/* d$ cmd: INV (discard or wback-n-discard) OR FLUSH (wback) */
aux_cmd = op & OP_INV ? ARC_REG_DC_IVDL : ARC_REG_DC_FLDL;
-#if (CONFIG_ARC_MMU_VER > 2)
- aux_tag = ARC_REG_DC_PTAG;
-#endif
}

/* Ensure we properly floor/ceil the non-line aligned/sized requests
@@ -167,7 +161,7 @@ static inline void __cache_line_loop(unsigned long paddr, unsigned long vaddr,
* -@paddr will be cache-line aligned already (being page aligned)
* -@sz will be integral multiple of line size (being page sized).
*/
- if (!full_page_op) {
+ if (!full_page) {
sz += paddr & ~CACHE_LINE_MASK;
paddr &= CACHE_LINE_MASK;
vaddr &= CACHE_LINE_MASK;
@@ -175,32 +169,68 @@ static inline void __cache_line_loop(unsigned long paddr, unsigned long vaddr,

num_lines = DIV_ROUND_UP(sz, L1_CACHE_BYTES);

-#if (CONFIG_ARC_MMU_VER <= 2)
/* MMUv2 and before: paddr contains stuffed vaddrs bits */
paddr |= (vaddr >> PAGE_SHIFT) & 0x1F;
-#else
- /* if V-P const for loop, PTAG can be written once outside loop */
- if (full_page_op)
+
+ while (num_lines-- > 0) {
+ write_aux_reg(aux_cmd, paddr);
+ paddr += L1_CACHE_BYTES;
+ }
+}
+
+static inline
+void __cache_line_loop_v3(unsigned long paddr, unsigned long vaddr,
+ unsigned long sz, const int op)
+{
+ unsigned int aux_cmd, aux_tag;
+ int num_lines;
+ const int full_page = __builtin_constant_p(sz) && sz == PAGE_SIZE;
+
+ if (op == OP_INV_IC) {
+ aux_cmd = ARC_REG_IC_IVIL;
+ aux_tag = ARC_REG_IC_PTAG;
+ } else {
+ aux_cmd = op & OP_INV ? ARC_REG_DC_IVDL : ARC_REG_DC_FLDL;
+ aux_tag = ARC_REG_DC_PTAG;
+ }
+
+ /* Ensure we properly floor/ceil the non-line aligned/sized requests
+ * and have @paddr - aligned to cache line and integral @num_lines.
+ * This however can be avoided for page sized since:
+ * -@paddr will be cache-line aligned already (being page aligned)
+ * -@sz will be integral multiple of line size (being page sized).
+ */
+ if (!full_page) {
+ sz += paddr & ~CACHE_LINE_MASK;
+ paddr &= CACHE_LINE_MASK;
+ vaddr &= CACHE_LINE_MASK;
+ }
+ num_lines = DIV_ROUND_UP(sz, L1_CACHE_BYTES);
+
+ /*
+ * MMUv3, cache ops require paddr seperately
+ * if V-P const for loop, PTAG can be written once outside loop
+ */
+ if (full_page)
write_aux_reg(aux_tag, paddr);
-#endif

while (num_lines-- > 0) {
-#if (CONFIG_ARC_MMU_VER > 2)
- /* MMUv3, cache ops require paddr seperately */
- if (!full_page_op) {
+ if (!full_page) {
write_aux_reg(aux_tag, paddr);
paddr += L1_CACHE_BYTES;
}

write_aux_reg(aux_cmd, vaddr);
vaddr += L1_CACHE_BYTES;
-#else
- write_aux_reg(aux_cmd, paddr);
- paddr += L1_CACHE_BYTES;
-#endif
}
}

+#if (CONFIG_ARC_MMU_VER < 3)
+#define __cache_line_loop __cache_line_loop_v2
+#elif (CONFIG_ARC_MMU_VER == 3)
+#define __cache_line_loop __cache_line_loop_v3
+#endif
+
#ifdef CONFIG_ARC_HAS_DCACHE

/***************************************************************
--
1.9.1


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