crypto: ccp - CCP versioning support

Future hardware may introduce new algorithms wherein the
driver will need to manage resources for different versions
of the cryptographic coprocessor. This precursor patch
determines the version of the available device, and marks
and registers algorithms accordingly. A structure is added
which manages the version-specific data.

Signed-off-by: Gary R Hook <gary.hook@amd.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/linux/ccp.h b/include/linux/ccp.h
index 7f437036baa4..915af3095b39 100644
--- a/include/linux/ccp.h
+++ b/include/linux/ccp.h
@@ -33,6 +33,18 @@ struct ccp_cmd;
  */
 int ccp_present(void);
 
+#define	CCP_VSIZE 16
+#define	CCP_VMASK		((unsigned int)((1 << CCP_VSIZE) - 1))
+#define	CCP_VERSION(v, r)	((unsigned int)((v << CCP_VSIZE) \
+					       | (r & CCP_VMASK)))
+
+/**
+ * ccp_version - get the version of the CCP
+ *
+ * Returns a positive version number, or zero if no CCP
+ */
+unsigned int ccp_version(void);
+
 /**
  * ccp_enqueue_cmd - queue an operation for processing by the CCP
  *
@@ -65,6 +77,11 @@ static inline int ccp_present(void)
 	return -ENODEV;
 }
 
+static inline unsigned int ccp_version(void)
+{
+	return 0;
+}
+
 static inline int ccp_enqueue_cmd(struct ccp_cmd *cmd)
 {
 	return -ENODEV;