drivers/s390/crypto/zcrypt_cex2a.c

   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
  60 static 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
  66 MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_ids);
  67 MODULE_AUTHOR("IBM Corporation");
  68 MODULE_DESCRIPTION("CEX2A Cryptographic Coprocessor device driver, " \
  69                    "Copyright IBM Corp. 2001, 2012");
  70 MODULE_LICENSE("GPL");
  71
  72 static int zcrypt_cex2a_probe(struct ap_device *ap_dev);
  73 static void zcrypt_cex2a_remove(struct ap_device *ap_dev);
  74
  75 static 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  */
  87 static 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  */
 144 static 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
 153 int __init zcrypt_cex2a_init(void)
 154 {
 155         return ap_driver_register(&zcrypt_cex2a_driver, THIS_MODULE, "cex2a");
 156 }
 157
 158 void __exit zcrypt_cex2a_exit(void)
 159 {
 160         ap_driver_unregister(&zcrypt_cex2a_driver);
 161 }
 162
 163 module_init(zcrypt_cex2a_init);
 164 module_exit(zcrypt_cex2a_exit);