armv7: add wrapper for DCCSW (data cache clean by set/way)

This adds a wrapper for data cache clean (without invalidate)
by set/way.

Signed-off-by: David Hendricks <dhendrix@chromium.org>

Old-Change-Id: I09ee1563890350a6c1d04f1b96ac5d0c042e2af2
Reviewed-on: https://gerrit.chromium.org/gerrit/66118
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Ronald G. Minnich <rminnich@chromium.org>
(cherry picked from commit 05bc4f8564c547eacb9cc840a03b916b3c1c6001)

armv7: clean but do not invalidate caches between stages

This cleans the caches without invalidating them between stages. The
dcache content should still be valid when the next stage begins, so
we should see a small performance gain.

(thanks to gabeblack for pointing this out)

Signed-off-by: David Hendricks <dhendrix@chromium.org>

Old-Change-Id: Ie18d163f3a78e2786e9fbc7479c8bd896b8ac3aa
Reviewed-on: https://gerrit.chromium.org/gerrit/66119
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Ronald G. Minnich <rminnich@chromium.org>
(cherry picked from commit 619bfe4cf9b93847e38d03d7076beb78fbfa1d1d)

armv7: Make coreboot and libpayload cache files the same

This merges the difference between the ARM version of cache.c and
cache.h for libpayload and coreboot.

Signed-off-by: David Hendricks <dhendrix@chromium.org>

Old-Change-Id: I246d2ec98385100304266f4bb15337a8fcf8df93
Reviewed-on: https://gerrit.chromium.org/gerrit/66120
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Ronald G. Minnich <rminnich@chromium.org>
(cherry picked from commit 0c92f694034f1e94a8aa7811251738c9dc3db2c6)

ARM: Fix cache cleaning operation.

There was no behavior defined for OP_DCCSW in dcache_op_set_way, so it
silently did nothing. Since we started using that to clean the cache between
stages and I have a change that enables caches earlier on, this was preventing
booting on pit.

Old-Change-Id: I3615b6569bf8de195d19d26b62f02932322b7601
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/66234
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit 99241468cb9dcc86fcca9266ffe72baa88a1f79f)

libpayload: Fix data cache cleaning on ARM.

A similar fix was made to coreboot where OP_DCCSW was silently not doing
anything in dcache_op_set_way.

Old-Change-Id: Ia0798aef0cd02da7d1a14b7affa05038a002ab3b
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/66236
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit 6f6596a182a6780a2e997ac320733722697990c5)

Squashed five related commits.

Change-Id: I763d42bd5dd9f58734e1e21eb7c8ce3ce2ea56ee
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6418
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

2 files changed, 25 insertions, 0 deletions

diff --git a/payloads/libpayload/arch/armv7/cache.c b/payloads/libpayload/arch/armv7/cache.c
index efdf75ebbf..b4a937bf43 100644
--- a/payloads/libpayload/arch/armv7/cache.c
+++ b/payloads/libpayload/arch/armv7/cache.c
@@ -76,6 +76,7 @@ void icache_invalidate_all(void)
 }
 
 enum dcache_op {
+	OP_DCCSW,
 	OP_DCCISW,
 	OP_DCISW,
 	OP_DCCIMVAC,
@@ -142,6 +143,9 @@ static void dcache_op_set_way(enum dcache_op op)
 			case OP_DCISW:
 				dcisw(val);
 				break;
+			case OP_DCCSW:
+				dccsw(val);
+				break;
 			default:
 				break;
 			}
@@ -175,6 +179,11 @@ static void dcache_foreach(enum dcache_op op)
 	}
 }
 
+void dcache_clean_all(void)
+{
+	dcache_foreach(OP_DCCSW);
+}
+
 void dcache_clean_invalidate_all(void)
 {
 	dcache_foreach(OP_DCCISW);
diff --git a/payloads/libpayload/include/armv7/arch/cache.h b/payloads/libpayload/include/armv7/arch/cache.h
index 0414da37f2..0756f11813 100644
--- a/payloads/libpayload/include/armv7/arch/cache.h
+++ b/payloads/libpayload/include/armv7/arch/cache.h
@@ -110,6 +110,12 @@ static inline void tlbiall(void)
 	asm volatile ("mcr p15, 0, %0, c8, c7, 0" : : "r" (0) : "memory");
 }
 
+/* invalidate unified TLB by MVA, all ASID */
+static inline void tlbimvaa(unsigned long mva)
+{
+	asm volatile ("mcr p15, 0, %0, c8, c7, 3" : : "r" (mva) : "memory");
+}
+
 /* write data access control register (DACR) */
 static inline void write_dacr(uint32_t val)
 {
@@ -164,6 +170,12 @@ static inline void dccmvac(unsigned long mva)
 	asm volatile ("mcr p15, 0, %0, c7, c10, 1" : : "r" (mva) : "memory");
 }
 
+/* data cache clean by set/way */
+static inline void dccsw(uint32_t val)
+{
+	asm volatile ("mcr p15, 0, %0, c7, c10, 2" : : "r" (val) : "memory");
+}
+
 /* data cache invalidate by MVA to PoC */
 static inline void dcimvac(unsigned long mva)
 {
@@ -286,6 +298,8 @@ void dcache_clean_invalidate_by_mva(unsigned long addr, unsigned long len);
 /* dcache invalidate by modified virtual address to PoC */
 void dcache_invalidate_by_mva(unsigned long addr, unsigned long len);
 
+void dcache_clean_all(void);
+
 /* dcache invalidate all (on current level given by CCSELR) */
 void dcache_invalidate_all(void);
 
@@ -317,6 +331,8 @@ enum dcache_policy {
 	DCACHE_WRITETHROUGH,
 };
 
+/* disable the mmu for a range. Primarily useful to lock out address 0. */
+void mmu_disable_range(unsigned long start_mb, unsigned long size_mb);
 /* mmu range configuration (set dcache policy) */
 void mmu_config_range(unsigned long start_mb, unsigned long size_mb,
 						enum dcache_policy policy);