LXR linux/drivers/s390/crypto/zcrypt

   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