crypto: ccp - Base AXI DMA cache settings on device tree
The default cache operations for ARM64 were changed during 3.15.
To use coherent operations a "dma-coherent" device tree property
is required. If that property is not present in the device tree
node then the non-coherent operations are assigned for the device.
Add support to the ccp driver to assign the AXI DMA cache settings
based on whether the "dma-coherent" property is present in the device
node. If present, use settings that work with the caches. If not
present, use settings that do not look at the caches.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/ccp/ccp-platform.c b/drivers/crypto/ccp/ccp-platform.c
index 65e5829..b0a2806 100644
--- a/drivers/crypto/ccp/ccp-platform.c
+++ b/drivers/crypto/ccp/ccp-platform.c
@@ -22,6 +22,7 @@
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/ccp.h>
+#include <linux/of.h>
#include "ccp-dev.h"
@@ -112,6 +113,11 @@
*(dev->dma_mask) = DMA_BIT_MASK(48);
dev->coherent_dma_mask = DMA_BIT_MASK(48);
+ if (of_property_read_bool(dev->of_node, "dma-coherent"))
+ ccp->axcache = CACHE_WB_NO_ALLOC;
+ else
+ ccp->axcache = CACHE_NONE;
+
dev_set_drvdata(dev, ccp);
ret = ccp_init(ccp);