| Holger Dengler | 1e2076f | 2012-08-28 16:48:29 +0200 | [diff] [blame] | 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 | #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 | |
| 56 | /** |
| 57 | * Probe function for CEX4 cards. It always accepts the AP device |
| 58 | * since the bus_match already checked the hardware type. |
| 59 | * @ap_dev: pointer to the AP device. |
| 60 | */ |
| 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 | |
| 122 | /** |
| 123 | * This is called to remove the extended CEX4 driver information |
| 124 | * if an AP device is removed. |
| 125 | */ |
| 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); |