blob: 569f8b1d86c05305501530b33d2fdfba84e114a9 [file] [log] [blame]
Holger Dengler1e2076f2012-08-28 16:48:29 +02001/*
2 * Copyright IBM Corp. 2012
3 * Author(s): Holger Dengler <hd@linux.vnet.ibm.com>
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
Ingo Tuchscherer91f3e3e2013-11-20 10:47:13 +010033/* Waiting time for requests to be processed.
34 * Currently there are some types of request which are not deterministic.
35 * But the maximum time limit managed by the stomper code is set to 60sec.
36 * Hence we have to wait at least that time period.
37 */
38#define CEX4_CLEANUP_TIME (61*HZ)
Holger Dengler1e2076f2012-08-28 16:48:29 +020039
40static struct ap_device_id zcrypt_cex4_ids[] = {
41 { AP_DEVICE(AP_DEVICE_TYPE_CEX4) },
42 { /* end of list */ },
43};
44
45MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids);
46MODULE_AUTHOR("IBM Corporation");
47MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
48 "Copyright IBM Corp. 2012");
49MODULE_LICENSE("GPL");
50
51static int zcrypt_cex4_probe(struct ap_device *ap_dev);
52static void zcrypt_cex4_remove(struct ap_device *ap_dev);
53
54static struct ap_driver zcrypt_cex4_driver = {
55 .probe = zcrypt_cex4_probe,
56 .remove = zcrypt_cex4_remove,
57 .ids = zcrypt_cex4_ids,
58 .request_timeout = CEX4_CLEANUP_TIME,
59};
60
61/**
62 * Probe function for CEX4 cards. It always accepts the AP device
63 * since the bus_match already checked the hardware type.
64 * @ap_dev: pointer to the AP device.
65 */
66static int zcrypt_cex4_probe(struct ap_device *ap_dev)
67{
68 struct zcrypt_device *zdev = NULL;
69 int rc = 0;
70
71 switch (ap_dev->device_type) {
72 case AP_DEVICE_TYPE_CEX4:
73 if (ap_test_bit(&ap_dev->functions, AP_FUNC_ACCEL)) {
74 zdev = zcrypt_device_alloc(CEX4A_MAX_MESSAGE_SIZE);
75 if (!zdev)
76 return -ENOMEM;
77 zdev->type_string = "CEX4A";
78 zdev->user_space_type = ZCRYPT_CEX3A;
79 zdev->min_mod_size = CEX4A_MIN_MOD_SIZE;
80 if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) &&
81 ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) {
82 zdev->max_mod_size =
83 CEX4A_MAX_MOD_SIZE_4K;
84 zdev->max_exp_bit_length =
85 CEX4A_MAX_MOD_SIZE_4K;
86 } else {
87 zdev->max_mod_size =
88 CEX4A_MAX_MOD_SIZE_2K;
89 zdev->max_exp_bit_length =
90 CEX4A_MAX_MOD_SIZE_2K;
91 }
92 zdev->short_crt = 1;
93 zdev->speed_rating = CEX4A_SPEED_RATING;
94 zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
95 MSGTYPE50_VARIANT_DEFAULT);
96 } else if (ap_test_bit(&ap_dev->functions, AP_FUNC_COPRO)) {
97 zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
98 if (!zdev)
99 return -ENOMEM;
100 zdev->type_string = "CEX4C";
101 zdev->user_space_type = ZCRYPT_CEX3C;
102 zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
103 zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
104 zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
105 zdev->short_crt = 0;
106 zdev->speed_rating = CEX4C_SPEED_RATING;
107 zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
108 MSGTYPE06_VARIANT_DEFAULT);
Ingo Tuchscherer91f3e3e2013-11-20 10:47:13 +0100109 } else if (ap_test_bit(&ap_dev->functions, AP_FUNC_EP11)) {
110 zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
111 if (!zdev)
112 return -ENOMEM;
113 zdev->type_string = "CEX4P";
114 zdev->user_space_type = ZCRYPT_CEX4;
115 zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
116 zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
117 zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
118 zdev->short_crt = 0;
119 zdev->speed_rating = CEX4C_SPEED_RATING;
120 zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
121 MSGTYPE06_VARIANT_EP11);
Holger Dengler1e2076f2012-08-28 16:48:29 +0200122 }
123 break;
124 }
125 if (!zdev)
126 return -ENODEV;
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 zcrypt_msgtype_release(zdev->ops);
134 ap_dev->private = NULL;
135 zcrypt_device_free(zdev);
136 }
137 return rc;
138}
139
140/**
141 * This is called to remove the extended CEX4 driver information
142 * if an AP device is removed.
143 */
144static void zcrypt_cex4_remove(struct ap_device *ap_dev)
145{
146 struct zcrypt_device *zdev = ap_dev->private;
147 struct zcrypt_ops *zops;
148
149 if (zdev) {
150 zops = zdev->ops;
151 zcrypt_device_unregister(zdev);
152 zcrypt_msgtype_release(zops);
153 }
154}
155
156int __init zcrypt_cex4_init(void)
157{
158 return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4");
159}
160
161void __exit zcrypt_cex4_exit(void)
162{
163 ap_driver_unregister(&zcrypt_cex4_driver);
164}
165
166module_init(zcrypt_cex4_init);
167module_exit(zcrypt_cex4_exit);