[U-Boot] [PATCH 2/3] crypto/fsl: fix snooping for write transactions

[Horia Geantă]

HW coherency won't work properly for CAAM write transactions
if AWCACHE is left to default (POR) value - 4'b0001.
It has to be programmed to 4'b0010.

For platforms that have HW coherency support:
-PPC-based: the update has no effect; CAAM coherency already works
due to the IOMMU (PAMU) driver setting the correct memory coherency
attributes
-ARM-based: the update fixes cache coherency issues,
since IOMMU (SMMU) driver is not programmed to behave similar to PAMU

Fixes: b9eebfade974c ("fsl_sec: Add hardware accelerated SHA256 and SHA1")
Signed-off-by: Horia Geantă <horia.geanta at freescale.com>
Reviewed-by: Aneesh Bansal <aneesh.bansal at freescale.com>
Reviewed-by: Mingkai Hu <Mingkai.Hu at freescale.com>
---
 drivers/crypto/fsl/jr.c | 10 ++++++----
 drivers/crypto/fsl/jr.h |  2 ++
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/fsl/jr.c b/drivers/crypto/fsl/jr.c
index f99d59480c81..e2bd913aa259 100644
--- a/drivers/crypto/fsl/jr.c
+++ b/drivers/crypto/fsl/jr.c
@@ -459,14 +459,16 @@ static int rng_init(void)
 
 int sec_init(void)
 {
-	int ret = 0;
-
-#ifdef CONFIG_PHYS_64BIT
 	ccsr_sec_t *sec = (void *)CONFIG_SYS_FSL_SEC_ADDR;
 	uint32_t mcr = sec_in32(&sec->mcfgr);
+	int ret = 0;
 
-	sec_out32(&sec->mcfgr, mcr | 1 << MCFGR_PS_SHIFT);
+	mcr = (mcr & ~MCFGR_AWCACHE_MASK) | (0x2 << MCFGR_AWCACHE_SHIFT);
+#ifdef CONFIG_PHYS_64BIT
+	mcr |= (1 << MCFGR_PS_SHIFT);
 #endif
+	sec_out32(&sec->mcfgr, mcr);
+
 	ret = jr_init();
 	if (ret < 0) {
 		printf("SEC initialization failed\n");
diff --git a/drivers/crypto/fsl/jr.h b/drivers/crypto/fsl/jr.h
index cce2c589ce0b..152606008845 100644
--- a/drivers/crypto/fsl/jr.h
+++ b/drivers/crypto/fsl/jr.h
@@ -21,6 +21,8 @@
 #define MCFGR_SWRST       ((uint32_t)(1)<<31) /* Software Reset */
 #define MCFGR_DMA_RST     ((uint32_t)(1)<<28) /* DMA Reset */
 #define MCFGR_PS_SHIFT          16
+#define MCFGR_AWCACHE_SHIFT	8
+#define MCFGR_AWCACHE_MASK	(0xf << MCFGR_AWCACHE_SHIFT)
 #define JR_INTMASK	  0x00000001
 #define JRCR_RESET                  0x01
 #define JRINT_ERR_HALT_INPROGRESS   0x4
-- 
2.4.4