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[U-Boot,v3,11/15] crypto/fsl: Make CAAM transactions cacheable

Message ID 1454327034-29462-12-git-send-email-saksham.jain@nxp.com
State Superseded
Delegated to: York Sun
Headers show

Commit Message

Saksham Jain Feb. 1, 2016, 11:43 a.m. UTC 
To solve CAAM coherency issue on ls2080a and ls2085a.
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: Aneesh Bansal <aneesh.bansal@nxp.com>
Signed-off-by: Saksham Jain <saksham.jain@nxp.com>
---
Changes for v2:
	- No changes
Changes for v3:
	- No changes

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

diff --git a/drivers/crypto/fsl/jr.c b/drivers/crypto/fsl/jr.c
index b8c0c0a..01d9967 100644
--- a/drivers/crypto/fsl/jr.c
+++ b/drivers/crypto/fsl/jr.c
@@ -539,7 +539,20 @@  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 5899696..1f2e324 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