[CRYPTO]: Standalone VIA PadLock driver.

Signed-off-by: David S. Miller <davem@davemloft.net>

crypto/Kconfig

@@ -274,5 +274,6 @@ config CRYPTO_TEST
 	help
 	  Quick & dirty crypto test module.
 
+source "drivers/crypto/Kconfig"
 endmenu
 

drivers/Makefile

@@ -60,3 +60,4 @@ obj-$(CONFIG_EISA)		+= eisa/
 obj-$(CONFIG_CPU_FREQ)		+= cpufreq/
 obj-$(CONFIG_MMC)		+= mmc/
 obj-y				+= firmware/
+obj-$(CONFIG_CRYPTO)		+= crypto/

drivers/crypto/Kconfig

+menu "Hardware crypto devices"
+
+config CRYPTO_DEV_PADLOCK
+	tristate "Support for VIA PadLock ACE"
+	depends on CRYPTO && X86 && !X86_64
+	help
+	  Some VIA processors come with an integrated crypto engine
+	  (so called VIA PadLock ACE, Advanced Cryptography Engine)
+	  that provides instructions for very fast {en,de}cryption 
+	  with some algorithms.
+	  
+	  The instructions are used only when the CPU supports them.
+	  Otherwise software encryption is used. If you are unsure,
+	  say Y.
+
+config CRYPTO_DEV_PADLOCK_AES
+	bool "Support for AES in VIA PadLock"
+	depends on CRYPTO_DEV_PADLOCK
+	default y
+	help
+	  Use VIA PadLock for AES algorithm.
+
+endmenu

drivers/crypto/Makefile

+
+obj-$(CONFIG_CRYPTO_DEV_PADLOCK) += padlock.o
+
+padlock-objs-$(CONFIG_CRYPTO_DEV_PADLOCK_AES) += padlock-aes.o
+
+padlock-objs := padlock-generic.o $(padlock-objs-y)
+

drivers/crypto/padlock-generic.c

+/* 
+ * Cryptographic API.
+ *
+ * Support for VIA PadLock hardware crypto engine.
+ *
+ * Copyright (c) 2004  Michal Ludvig <michal@logix.cz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/crypto.h>
+#include <asm/byteorder.h>
+#include "padlock.h"
+
+static int __init
+padlock_init(void)
+{
+	int ret = -ENOSYS;
+	
+	if (!cpu_has_xcrypt) {
+		printk(KERN_ERR PFX "VIA PadLock not detected.\n");
+		return -ENODEV;
+	}
+
+	if (!cpu_has_xcrypt_enabled) {
+		printk(KERN_ERR PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
+		return -ENODEV;
+	}
+
+#ifdef CONFIG_CRYPTO_DEV_PADLOCK_AES
+	if ((ret = padlock_init_aes())) {
+		printk(KERN_ERR PFX "VIA PadLock AES initialization failed.\n");
+		return ret;
+	}
+#endif
+
+	if (ret == -ENOSYS)
+		printk(KERN_ERR PFX "Hmm, VIA PadLock was compiled without any algorithm.\n");
+
+	return ret;
+}
+
+static void __exit
+padlock_fini(void)
+{
+#ifdef CONFIG_CRYPTO_DEV_PADLOCK_AES
+	padlock_fini_aes();
+#endif
+}
+
+module_init(padlock_init);
+module_exit(padlock_fini);
+
+MODULE_DESCRIPTION("VIA PadLock crypto engine support.");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Michal Ludvig");

drivers/crypto/padlock.h

+/*
+ * Driver for VIA PadLock
+ *
+ * Copyright (c) 2004 Michal Ludvig <michal@logix.cz>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.
+ *
+ */
+
+#ifndef _CRYPTO_PADLOCK_H
+#define _CRYPTO_PADLOCK_H
+
+/* Control word. */
+union cword {
+	uint32_t cword[4];
+	struct {
+		int rounds:4;
+		int algo:3;
+		int keygen:1;
+		int interm:1;
+		int encdec:1;
+		int ksize:2;
+	} b;
+};
+
+#define PFX	"padlock: "
+
+#ifdef CONFIG_CRYPTO_DEV_PADLOCK_AES
+int padlock_init_aes(void);
+void padlock_fini_aes(void);
+#endif
+
+#endif	/* _CRYPTO_PADLOCK_H */

include/linux/crypto.h

@@ -56,6 +56,9 @@
 #define CRYPTO_UNSPEC			0
 #define CRYPTO_MAX_ALG_NAME		64
 
+#define CRYPTO_DIR_ENCRYPT		1
+#define CRYPTO_DIR_DECRYPT		0
+
 struct scatterlist;
 
 /*