crypto: ixp4xx - check firmware for crypto support

- the loaded firmware may not support crypto at all or
only support DES and 3DES but not AES or
support DES, 3DES and AES.

- in case of no crypto support of the firmware, the module load will fail.
- in case of missing AES support, the AES algorithms are not registered
and a warning is printed during module load.

Signed-off-by: Christian Hohnstaedt <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/ixp4xx_crypto.c

···
 static int init_ixp_crypto(void)
 {
 	int ret = -ENODEV;
+	u32 msg[2] = { 0, 0 };
 
 	if (! ( ~(*IXP4XX_EXP_CFG2) & (IXP4XX_FEATURE_HASH |
 				IXP4XX_FEATURE_AES | IXP4XX_FEATURE_DES))) {
···
 		return ret;
 
 	if (!npe_running(npe_c)) {
-		npe_load_firmware(npe_c, npe_name(npe_c), dev);
+		ret = npe_load_firmware(npe_c, npe_name(npe_c), dev);
+		if (ret) {
+			return ret;
+		}
+		if (npe_recv_message(npe_c, msg, "STATUS_MSG"))
+			goto npe_error;
+	} else {
+		if (npe_send_message(npe_c, msg, "STATUS_MSG"))
+			goto npe_error;
+
+		if (npe_recv_message(npe_c, msg, "STATUS_MSG"))
+			goto npe_error;
 	}
 
+	switch ((msg[1]>>16) & 0xff) {
+	case 3:
+		printk(KERN_WARNING "Firmware of %s lacks AES support\n",
+				npe_name(npe_c));
+		support_aes = 0;
+		break;
+	case 4:
+	case 5:
+		support_aes = 1;
+		break;
+	default:
+		printk(KERN_ERR "Firmware of %s lacks crypto support\n",
+			npe_name(npe_c));
+		return -ENODEV;
+	}
 	/* buffer_pool will also be used to sometimes store the hmac,
 	 * so assure it is large enough
 	 */
···
 
 	qmgr_enable_irq(RECV_QID);
 	return 0;
+
+npe_error:
+	printk(KERN_ERR "%s not responding\n", npe_name(npe_c));
+	ret = -EIO;
 err:
 	if (ctx_pool)
 		dma_pool_destroy(ctx_pool);