1/*
2 *  zcrypt 2.1.0
3 *
4 *  Copyright IBM Corp. 2001, 2012
5 *  Author(s): Robert Burroughs
6 *	       Eric Rossman (edrossma@us.ibm.com)
7 *
8 *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
9 *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
10 *				  Ralph Wuerthner <rwuerthn@de.ibm.com>
11 *  MSGTYPE restruct:		  Holger Dengler <hd@linux.vnet.ibm.com>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
16 * any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28#include <linux/module.h>
29#include <linux/slab.h>
30#include <linux/init.h>
31#include <linux/err.h>
32#include <linux/atomic.h>
33#include <asm/uaccess.h>
34
35#include "ap_bus.h"
36#include "zcrypt_api.h"
37#include "zcrypt_error.h"
38#include "zcrypt_cex2a.h"
39#include "zcrypt_msgtype50.h"
40
41#define CEX2A_MIN_MOD_SIZE	  1	/*    8 bits	*/
42#define CEX2A_MAX_MOD_SIZE	256	/* 2048 bits	*/
43#define CEX3A_MIN_MOD_SIZE	CEX2A_MIN_MOD_SIZE
44#define CEX3A_MAX_MOD_SIZE	512	/* 4096 bits	*/
45
46#define CEX2A_SPEED_RATING	970
47#define CEX3A_SPEED_RATING	900 /* Fixme: Needs finetuning */
48
49#define CEX2A_MAX_MESSAGE_SIZE	0x390	/* sizeof(struct type50_crb2_msg)    */
50#define CEX2A_MAX_RESPONSE_SIZE 0x110	/* max outputdatalength + type80_hdr */
51
52#define CEX3A_MAX_RESPONSE_SIZE	0x210	/* 512 bit modulus
53					 * (max outputdatalength) +
54					 * type80_hdr*/
55#define CEX3A_MAX_MESSAGE_SIZE	sizeof(struct type50_crb3_msg)
56
57#define CEX2A_CLEANUP_TIME	(15*HZ)
58#define CEX3A_CLEANUP_TIME	CEX2A_CLEANUP_TIME
59
60static struct ap_device_id zcrypt_cex2a_ids[] = {
61	{ AP_DEVICE(AP_DEVICE_TYPE_CEX2A) },
62	{ AP_DEVICE(AP_DEVICE_TYPE_CEX3A) },
63	{ /* end of list */ },
64};
65
66MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_ids);
67MODULE_AUTHOR("IBM Corporation");
68MODULE_DESCRIPTION("CEX2A Cryptographic Coprocessor device driver, " \
69		   "Copyright IBM Corp. 2001, 2012");
70MODULE_LICENSE("GPL");
71
72static int zcrypt_cex2a_probe(struct ap_device *ap_dev);
73static void zcrypt_cex2a_remove(struct ap_device *ap_dev);
74
75static struct ap_driver zcrypt_cex2a_driver = {
76	.probe = zcrypt_cex2a_probe,
77	.remove = zcrypt_cex2a_remove,
78	.ids = zcrypt_cex2a_ids,
79	.request_timeout = CEX2A_CLEANUP_TIME,
80};
81
82/**
83 * Probe function for CEX2A cards. It always accepts the AP device
84 * since the bus_match already checked the hardware type.
85 * @ap_dev: pointer to the AP device.
86 */
87static int zcrypt_cex2a_probe(struct ap_device *ap_dev)
88{
89	struct zcrypt_device *zdev = NULL;
90	int rc = 0;
91
92	switch (ap_dev->device_type) {
93	case AP_DEVICE_TYPE_CEX2A:
94		zdev = zcrypt_device_alloc(CEX2A_MAX_RESPONSE_SIZE);
95		if (!zdev)
96			return -ENOMEM;
97		zdev->user_space_type = ZCRYPT_CEX2A;
98		zdev->type_string = "CEX2A";
99		zdev->min_mod_size = CEX2A_MIN_MOD_SIZE;
100		zdev->max_mod_size = CEX2A_MAX_MOD_SIZE;
101		zdev->short_crt = 1;
102		zdev->speed_rating = CEX2A_SPEED_RATING;
103		zdev->max_exp_bit_length = CEX2A_MAX_MOD_SIZE;
104		break;
105	case AP_DEVICE_TYPE_CEX3A:
106		zdev = zcrypt_device_alloc(CEX3A_MAX_RESPONSE_SIZE);
107		if (!zdev)
108			return -ENOMEM;
109		zdev->user_space_type = ZCRYPT_CEX3A;
110		zdev->type_string = "CEX3A";
111		zdev->min_mod_size = CEX2A_MIN_MOD_SIZE;
112		zdev->max_mod_size = CEX2A_MAX_MOD_SIZE;
113		zdev->max_exp_bit_length = CEX2A_MAX_MOD_SIZE;
114		if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) &&
115		    ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) {
116			zdev->max_mod_size = CEX3A_MAX_MOD_SIZE;
117			zdev->max_exp_bit_length = CEX3A_MAX_MOD_SIZE;
118		}
119		zdev->short_crt = 1;
120		zdev->speed_rating = CEX3A_SPEED_RATING;
121		break;
122	}
123	if (!zdev)
124		return -ENODEV;
125	zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
126					   MSGTYPE50_VARIANT_DEFAULT);
127	zdev->ap_dev = ap_dev;
128	zdev->online = 1;
129	ap_dev->reply = &zdev->reply;
130	ap_dev->private = zdev;
131	rc = zcrypt_device_register(zdev);
132	if (rc) {
133		ap_dev->private = NULL;
134		zcrypt_msgtype_release(zdev->ops);
135		zcrypt_device_free(zdev);
136	}
137	return rc;
138}
139
140/**
141 * This is called to remove the extended CEX2A driver information
142 * if an AP device is removed.
143 */
144static void zcrypt_cex2a_remove(struct ap_device *ap_dev)
145{
146	struct zcrypt_device *zdev = ap_dev->private;
147	struct zcrypt_ops *zops = zdev->ops;
148
149	zcrypt_device_unregister(zdev);
150	zcrypt_msgtype_release(zops);
151}
152
153int __init zcrypt_cex2a_init(void)
154{
155	return ap_driver_register(&zcrypt_cex2a_driver, THIS_MODULE, "cex2a");
156}
157
158void __exit zcrypt_cex2a_exit(void)
159{
160	ap_driver_unregister(&zcrypt_cex2a_driver);
161}
162
163module_init(zcrypt_cex2a_init);
164module_exit(zcrypt_cex2a_exit);
165