1 /* 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 33 /* 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) 39 40 static struct ap_device_id zcrypt_cex4_ids[] = { 41 { AP_DEVICE(AP_DEVICE_TYPE_CEX4) }, 42 { /* end of list */ }, 43 }; 44 45 MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids); 46 MODULE_AUTHOR("IBM Corporation"); 47 MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \ 48 "Copyright IBM Corp. 2012"); 49 MODULE_LICENSE("GPL"); 50 51 static int zcrypt_cex4_probe(struct ap_device *ap_dev); 52 static void zcrypt_cex4_remove(struct ap_device *ap_dev); 53 54 static 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 */ 66 static 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); 109 } 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); 122 } 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 */ 144 static 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 } 155 156 int __init zcrypt_cex4_init(void) 157 { 158 return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4"); 159 } 160 161 void __exit zcrypt_cex4_exit(void) 162 { 163 ap_driver_unregister(&zcrypt_cex4_driver); 164 } 165 166 module_init(zcrypt_cex4_init); 167 module_exit(zcrypt_cex4_exit); 168