[U-Boot] [PATCH v5 11/14] crypto/fsl: Make CAAM transactions cacheable

Saksham Jain
2016-03-23T10:54:42Z

This commit solves CAAM coherency issue on ls2080. When Caches are
enabled and CAAM's DMA's AXI transcations are not made cacheable, Core
reads/write data from/to Caches and CAAM does from Main Memory. This
forces data flushes to synchronize various data structures. But even if
any data in proximity of these structures is read by core, these
structures again are fetched in caches.

To avoid this problem, either all the data that CAAM accesses can be
made cache line aligned or CAAM transcations can be made cacheable.

So, this commit makes CAAM transcations as Write Back with Write and
Read Allocate.

Signed-off-by: Saksham Jain <saksham.jain@nxp.com>
---
Changes for v2:
- No changes
Changes for v3:
- No changes
Changes for v4:
- Cleaned up commit message
Changes for v5:
- Cleaned up commit message

drivers/crypto/fsl/jr.c | 13 +++++++++++++
drivers/crypto/fsl/jr.h | 3 +++
2 files changed, 16 insertions(+)

diff --git a/drivers/crypto/fsl/jr.c b/drivers/crypto/fsl/jr.c
index b766470..894fa03 100644
--- a/drivers/crypto/fsl/jr.c
+++ b/drivers/crypto/fsl/jr.c
@@ -543,7 +543,20 @@ int sec_init(void)
uint32_t liodn_s;
#endif

+ /*
+ * Modifying CAAM Read/Write Attributes
+ * For LS2080A and LS2085A
+ * For AXI Write - Cacheable, Write Back, Write allocate
+ * For AXI Read - Cacheable, Read allocate
+ * Only For LS2080a and LS2085a, to solve CAAM coherency issues
+ */
+#if defined(CONFIG_LS2080A) || defined(CONFIG_LS2085A)
+ mcr = (mcr & ~MCFGR_AWCACHE_MASK) | (0xb << MCFGR_AWCACHE_SHIFT);
+ mcr = (mcr & ~MCFGR_ARCACHE_MASK) | (0x6 << MCFGR_ARCACHE_SHIFT);
+#else
mcr = (mcr & ~MCFGR_AWCACHE_MASK) | (0x2 << MCFGR_AWCACHE_SHIFT);
+#endif
+
#ifdef CONFIG_PHYS_64BIT
mcr |= (1 << MCFGR_PS_SHIFT);
#endif
diff --git a/drivers/crypto/fsl/jr.h b/drivers/crypto/fsl/jr.h
index 545d964..1642dbb 100644
--- a/drivers/crypto/fsl/jr.h
+++ b/drivers/crypto/fsl/jr.h
@@ -23,6 +23,9 @@
#define MCFGR_PS_SHIFT 16
#define MCFGR_AWCACHE_SHIFT 8
#define MCFGR_AWCACHE_MASK (0xf << MCFGR_AWCACHE_SHIFT)
+#define MCFGR_ARCACHE_SHIFT 12
+#define MCFGR_ARCACHE_MASK (0xf << MCFGR_ARCACHE_SHIFT)
+
#define JR_INTMASK 0x00000001
#define JRCR_RESET 0x01
#define JRINT_ERR_HALT_INPROGRESS 0x4
--
1.8.1.4