csrypto: ccp - Expand RSA support for a v5 ccp

A version 5 CCP can handle an RSA modulus up to 16k bits.
Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/ccp/ccp-crypto-rsa.c

@@ -60,7 +60,10 @@ static int ccp_rsa_complete(struct crypto_async_request *async_req, int ret)
 
 static unsigned int ccp_rsa_maxsize(struct crypto_akcipher *tfm)
 {
-	return CCP_RSA_MAXMOD;
+	if (ccp_version() > CCP_VERSION(3, 0))
+		return CCP5_RSA_MAXMOD;
+	else
+		return CCP_RSA_MAXMOD;
 }
 
 static int ccp_rsa_crypt(struct akcipher_request *req, bool encrypt)

drivers/crypto/ccp/ccp-crypto.h

@@ -255,6 +255,7 @@ struct ccp_rsa_req_ctx {
 };
 
 #define	CCP_RSA_MAXMOD	(4 * 1024 / 8)
+#define	CCP5_RSA_MAXMOD	(16 * 1024 / 8)
 
 /***** Common Context Structure *****/
 struct ccp_ctx {

drivers/crypto/ccp/ccp-dev-v3.c

@@ -597,4 +597,5 @@ const struct ccp_vdata ccpv3 = {
 	.setup = NULL,
 	.perform = &ccp3_actions,
 	.offset = 0x20000,
+	.rsamax = CCP_RSA_MAX_WIDTH,
 };

drivers/crypto/ccp/ccp-dev-v5.c

@@ -1112,6 +1112,7 @@ const struct ccp_vdata ccpv5a = {
 	.setup = ccp5_config,
 	.perform = &ccp5_actions,
 	.offset = 0x0,
+	.rsamax = CCP5_RSA_MAX_WIDTH,
 };
 
 const struct ccp_vdata ccpv5b = {
@@ -1120,4 +1121,5 @@ const struct ccp_vdata ccpv5b = {
 	.setup = ccp5other_config,
 	.perform = &ccp5_actions,
 	.offset = 0x0,
+	.rsamax = CCP5_RSA_MAX_WIDTH,
 };

drivers/crypto/ccp/ccp-dev.h

@@ -202,6 +202,7 @@
 #define CCP_SHA_SB_COUNT		1
 
 #define CCP_RSA_MAX_WIDTH		4096
+#define CCP5_RSA_MAX_WIDTH		16384
 
 #define CCP_PASSTHRU_BLOCKSIZE		256
 #define CCP_PASSTHRU_MASKSIZE		32

drivers/crypto/ccp/ccp-ops.c

@@ -1736,7 +1736,8 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	unsigned int sb_count, i_len, o_len;
 	int ret;
 
-	if (rsa->key_size > CCP_RSA_MAX_WIDTH)
+	/* Check against the maximum allowable size, in bits */
+	if (rsa->key_size > cmd_q->ccp->vdata->rsamax)
 		return -EINVAL;
 
 	if (!rsa->exp || !rsa->mod || !rsa->src || !rsa->dst)

drivers/crypto/ccp/sp-dev.h

@@ -40,6 +40,7 @@ struct ccp_vdata {
 	void (*setup)(struct ccp_device *);
 	const struct ccp_actions *perform;
 	const unsigned int offset;
+	const unsigned int rsamax;
 };
 /* Structure to hold SP device data */
 struct sp_dev_vdata {