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zcrypt_cex4.c
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1 /*
2  * Copyright IBM Corp. 2012
3  * Author(s): Holger Dengler <[email protected]>
4  */
5 
6 #include <linux/module.h>
7 #include <linux/slab.h>
8 #include <linux/init.h>
9 #include <linux/err.h>
10 #include <linux/atomic.h>
11 #include <linux/uaccess.h>
12 
13 #include "ap_bus.h"
14 #include "zcrypt_api.h"
15 #include "zcrypt_msgtype6.h"
16 #include "zcrypt_msgtype50.h"
17 #include "zcrypt_error.h"
18 #include "zcrypt_cex4.h"
19 
20 #define CEX4A_MIN_MOD_SIZE 1 /* 8 bits */
21 #define CEX4A_MAX_MOD_SIZE_2K 256 /* 2048 bits */
22 #define CEX4A_MAX_MOD_SIZE_4K 512 /* 4096 bits */
23 
24 #define CEX4C_MIN_MOD_SIZE 16 /* 256 bits */
25 #define CEX4C_MAX_MOD_SIZE 512 /* 4096 bits */
26 
27 #define CEX4A_SPEED_RATING 900 /* TODO new card, new speed rating */
28 #define CEX4C_SPEED_RATING 6500 /* TODO new card, new speed rating */
29 
30 #define CEX4A_MAX_MESSAGE_SIZE MSGTYPE50_CRB3_MAX_MSG_SIZE
31 #define CEX4C_MAX_MESSAGE_SIZE MSGTYPE06_MAX_MSG_SIZE
32 
33 #define CEX4_CLEANUP_TIME (15*HZ)
34 
35 static struct ap_device_id zcrypt_cex4_ids[] = {
36  { AP_DEVICE(AP_DEVICE_TYPE_CEX4) },
37  { /* end of list */ },
38 };
39 
40 MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids);
41 MODULE_AUTHOR("IBM Corporation");
42 MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
43  "Copyright IBM Corp. 2012");
44 MODULE_LICENSE("GPL");
45 
46 static int zcrypt_cex4_probe(struct ap_device *ap_dev);
47 static void zcrypt_cex4_remove(struct ap_device *ap_dev);
48 
49 static struct ap_driver zcrypt_cex4_driver = {
50  .probe = zcrypt_cex4_probe,
51  .remove = zcrypt_cex4_remove,
52  .ids = zcrypt_cex4_ids,
53  .request_timeout = CEX4_CLEANUP_TIME,
54 };
55 
61 static int zcrypt_cex4_probe(struct ap_device *ap_dev)
62 {
63  struct zcrypt_device *zdev = NULL;
64  int rc = 0;
65 
66  switch (ap_dev->device_type) {
67  case AP_DEVICE_TYPE_CEX4:
68  if (ap_test_bit(&ap_dev->functions, AP_FUNC_ACCEL)) {
69  zdev = zcrypt_device_alloc(CEX4A_MAX_MESSAGE_SIZE);
70  if (!zdev)
71  return -ENOMEM;
72  zdev->type_string = "CEX4A";
73  zdev->user_space_type = ZCRYPT_CEX3A;
74  zdev->min_mod_size = CEX4A_MIN_MOD_SIZE;
75  if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) &&
76  ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) {
77  zdev->max_mod_size =
78  CEX4A_MAX_MOD_SIZE_4K;
79  zdev->max_exp_bit_length =
80  CEX4A_MAX_MOD_SIZE_4K;
81  } else {
82  zdev->max_mod_size =
83  CEX4A_MAX_MOD_SIZE_2K;
84  zdev->max_exp_bit_length =
85  CEX4A_MAX_MOD_SIZE_2K;
86  }
87  zdev->short_crt = 1;
88  zdev->speed_rating = CEX4A_SPEED_RATING;
89  zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
90  MSGTYPE50_VARIANT_DEFAULT);
91  } else if (ap_test_bit(&ap_dev->functions, AP_FUNC_COPRO)) {
92  zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
93  if (!zdev)
94  return -ENOMEM;
95  zdev->type_string = "CEX4C";
96  zdev->user_space_type = ZCRYPT_CEX3C;
97  zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
98  zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
99  zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
100  zdev->short_crt = 0;
101  zdev->speed_rating = CEX4C_SPEED_RATING;
102  zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
103  MSGTYPE06_VARIANT_DEFAULT);
104  }
105  break;
106  }
107  if (!zdev)
108  return -ENODEV;
109  zdev->ap_dev = ap_dev;
110  zdev->online = 1;
111  ap_dev->reply = &zdev->reply;
112  ap_dev->private = zdev;
113  rc = zcrypt_device_register(zdev);
114  if (rc) {
115  zcrypt_msgtype_release(zdev->ops);
116  ap_dev->private = NULL;
117  zcrypt_device_free(zdev);
118  }
119  return rc;
120 }
121 
126 static void zcrypt_cex4_remove(struct ap_device *ap_dev)
127 {
128  struct zcrypt_device *zdev = ap_dev->private;
129  struct zcrypt_ops *zops;
130 
131  if (zdev) {
132  zops = zdev->ops;
133  zcrypt_device_unregister(zdev);
134  zcrypt_msgtype_release(zops);
135  }
136 }
137 
138 int __init zcrypt_cex4_init(void)
139 {
140  return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4");
141 }
142 
143 void __exit zcrypt_cex4_exit(void)
144 {
145  ap_driver_unregister(&zcrypt_cex4_driver);
146 }
147 
148 module_init(zcrypt_cex4_init);
149 module_exit(zcrypt_cex4_exit);
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