diff options
Diffstat (limited to 'kernel/drivers/s390/crypto/zcrypt_cex2a.c')
| -rw-r--r-- | kernel/drivers/s390/crypto/zcrypt_cex2a.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/kernel/drivers/s390/crypto/zcrypt_cex2a.c b/kernel/drivers/s390/crypto/zcrypt_cex2a.c new file mode 100644 index 000000000..1e849d6e1 --- /dev/null +++ b/kernel/drivers/s390/crypto/zcrypt_cex2a.c @@ -0,0 +1,164 @@ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com> + * Ralph Wuerthner <rwuerthn@de.ibm.com> + * MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/atomic.h> +#include <asm/uaccess.h> + +#include "ap_bus.h" +#include "zcrypt_api.h" +#include "zcrypt_error.h" +#include "zcrypt_cex2a.h" +#include "zcrypt_msgtype50.h" + +#define CEX2A_MIN_MOD_SIZE 1 /* 8 bits */ +#define CEX2A_MAX_MOD_SIZE 256 /* 2048 bits */ +#define CEX3A_MIN_MOD_SIZE CEX2A_MIN_MOD_SIZE +#define CEX3A_MAX_MOD_SIZE 512 /* 4096 bits */ + +#define CEX2A_SPEED_RATING 970 +#define CEX3A_SPEED_RATING 900 /* Fixme: Needs finetuning */ + +#define CEX2A_MAX_MESSAGE_SIZE 0x390 /* sizeof(struct type50_crb2_msg) */ +#define CEX2A_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */ + +#define CEX3A_MAX_RESPONSE_SIZE 0x210 /* 512 bit modulus + * (max outputdatalength) + + * type80_hdr*/ +#define CEX3A_MAX_MESSAGE_SIZE sizeof(struct type50_crb3_msg) + +#define CEX2A_CLEANUP_TIME (15*HZ) +#define CEX3A_CLEANUP_TIME CEX2A_CLEANUP_TIME + +static struct ap_device_id zcrypt_cex2a_ids[] = { + { AP_DEVICE(AP_DEVICE_TYPE_CEX2A) }, + { AP_DEVICE(AP_DEVICE_TYPE_CEX3A) }, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_ids); +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("CEX2A Cryptographic Coprocessor device driver, " \ + "Copyright IBM Corp. 2001, 2012"); +MODULE_LICENSE("GPL"); + +static int zcrypt_cex2a_probe(struct ap_device *ap_dev); +static void zcrypt_cex2a_remove(struct ap_device *ap_dev); + +static struct ap_driver zcrypt_cex2a_driver = { + .probe = zcrypt_cex2a_probe, + .remove = zcrypt_cex2a_remove, + .ids = zcrypt_cex2a_ids, + .request_timeout = CEX2A_CLEANUP_TIME, +}; + +/** + * Probe function for CEX2A cards. It always accepts the AP device + * since the bus_match already checked the hardware type. + * @ap_dev: pointer to the AP device. + */ +static int zcrypt_cex2a_probe(struct ap_device *ap_dev) +{ + struct zcrypt_device *zdev = NULL; + int rc = 0; + + switch (ap_dev->device_type) { + case AP_DEVICE_TYPE_CEX2A: + zdev = zcrypt_device_alloc(CEX2A_MAX_RESPONSE_SIZE); + if (!zdev) + return -ENOMEM; + zdev->user_space_type = ZCRYPT_CEX2A; + zdev->type_string = "CEX2A"; + zdev->min_mod_size = CEX2A_MIN_MOD_SIZE; + zdev->max_mod_size = CEX2A_MAX_MOD_SIZE; + zdev->short_crt = 1; + zdev->speed_rating = CEX2A_SPEED_RATING; + zdev->max_exp_bit_length = CEX2A_MAX_MOD_SIZE; + break; + case AP_DEVICE_TYPE_CEX3A: + zdev = zcrypt_device_alloc(CEX3A_MAX_RESPONSE_SIZE); + if (!zdev) + return -ENOMEM; + zdev->user_space_type = ZCRYPT_CEX3A; + zdev->type_string = "CEX3A"; + zdev->min_mod_size = CEX2A_MIN_MOD_SIZE; + zdev->max_mod_size = CEX2A_MAX_MOD_SIZE; + zdev->max_exp_bit_length = CEX2A_MAX_MOD_SIZE; + if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) && + ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) { + zdev->max_mod_size = CEX3A_MAX_MOD_SIZE; + zdev->max_exp_bit_length = CEX3A_MAX_MOD_SIZE; + } + zdev->short_crt = 1; + zdev->speed_rating = CEX3A_SPEED_RATING; + break; + } + if (!zdev) + return -ENODEV; + zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME, + MSGTYPE50_VARIANT_DEFAULT); + zdev->ap_dev = ap_dev; + zdev->online = 1; + ap_dev->reply = &zdev->reply; + ap_dev->private = zdev; + rc = zcrypt_device_register(zdev); + if (rc) { + ap_dev->private = NULL; + zcrypt_msgtype_release(zdev->ops); + zcrypt_device_free(zdev); + } + return rc; +} + +/** + * This is called to remove the extended CEX2A driver information + * if an AP device is removed. + */ +static void zcrypt_cex2a_remove(struct ap_device *ap_dev) +{ + struct zcrypt_device *zdev = ap_dev->private; + struct zcrypt_ops *zops = zdev->ops; + + zcrypt_device_unregister(zdev); + zcrypt_msgtype_release(zops); +} + +int __init zcrypt_cex2a_init(void) +{ + return ap_driver_register(&zcrypt_cex2a_driver, THIS_MODULE, "cex2a"); +} + +void __exit zcrypt_cex2a_exit(void) +{ + ap_driver_unregister(&zcrypt_cex2a_driver); +} + +module_init(zcrypt_cex2a_init); +module_exit(zcrypt_cex2a_exit); |