1e2076f452
New zcrypt module supports IBM CryptoExpress 4 cards. Signed-off-by: Holger Dengler <hd@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
149 lines
4 KiB
C
149 lines
4 KiB
C
/*
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* Copyright IBM Corp. 2012
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* Author(s): Holger Dengler <hd@linux.vnet.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/atomic.h>
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#include <linux/uaccess.h>
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#include "ap_bus.h"
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#include "zcrypt_api.h"
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#include "zcrypt_msgtype6.h"
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#include "zcrypt_msgtype50.h"
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#include "zcrypt_error.h"
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#include "zcrypt_cex4.h"
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#define CEX4A_MIN_MOD_SIZE 1 /* 8 bits */
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#define CEX4A_MAX_MOD_SIZE_2K 256 /* 2048 bits */
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#define CEX4A_MAX_MOD_SIZE_4K 512 /* 4096 bits */
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#define CEX4C_MIN_MOD_SIZE 16 /* 256 bits */
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#define CEX4C_MAX_MOD_SIZE 512 /* 4096 bits */
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#define CEX4A_SPEED_RATING 900 /* TODO new card, new speed rating */
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#define CEX4C_SPEED_RATING 6500 /* TODO new card, new speed rating */
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#define CEX4A_MAX_MESSAGE_SIZE MSGTYPE50_CRB3_MAX_MSG_SIZE
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#define CEX4C_MAX_MESSAGE_SIZE MSGTYPE06_MAX_MSG_SIZE
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#define CEX4_CLEANUP_TIME (15*HZ)
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static struct ap_device_id zcrypt_cex4_ids[] = {
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{ AP_DEVICE(AP_DEVICE_TYPE_CEX4) },
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{ /* end of list */ },
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};
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MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids);
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MODULE_AUTHOR("IBM Corporation");
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MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
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"Copyright IBM Corp. 2012");
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MODULE_LICENSE("GPL");
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static int zcrypt_cex4_probe(struct ap_device *ap_dev);
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static void zcrypt_cex4_remove(struct ap_device *ap_dev);
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static struct ap_driver zcrypt_cex4_driver = {
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.probe = zcrypt_cex4_probe,
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.remove = zcrypt_cex4_remove,
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.ids = zcrypt_cex4_ids,
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.request_timeout = CEX4_CLEANUP_TIME,
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};
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/**
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* Probe function for CEX4 cards. It always accepts the AP device
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* since the bus_match already checked the hardware type.
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* @ap_dev: pointer to the AP device.
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*/
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static int zcrypt_cex4_probe(struct ap_device *ap_dev)
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{
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struct zcrypt_device *zdev = NULL;
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int rc = 0;
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switch (ap_dev->device_type) {
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case AP_DEVICE_TYPE_CEX4:
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if (ap_test_bit(&ap_dev->functions, AP_FUNC_ACCEL)) {
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zdev = zcrypt_device_alloc(CEX4A_MAX_MESSAGE_SIZE);
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if (!zdev)
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return -ENOMEM;
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zdev->type_string = "CEX4A";
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zdev->user_space_type = ZCRYPT_CEX3A;
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zdev->min_mod_size = CEX4A_MIN_MOD_SIZE;
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if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) &&
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ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) {
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zdev->max_mod_size =
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CEX4A_MAX_MOD_SIZE_4K;
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zdev->max_exp_bit_length =
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CEX4A_MAX_MOD_SIZE_4K;
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} else {
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zdev->max_mod_size =
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CEX4A_MAX_MOD_SIZE_2K;
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zdev->max_exp_bit_length =
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CEX4A_MAX_MOD_SIZE_2K;
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}
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zdev->short_crt = 1;
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zdev->speed_rating = CEX4A_SPEED_RATING;
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zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
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MSGTYPE50_VARIANT_DEFAULT);
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} else if (ap_test_bit(&ap_dev->functions, AP_FUNC_COPRO)) {
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zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
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if (!zdev)
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return -ENOMEM;
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zdev->type_string = "CEX4C";
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zdev->user_space_type = ZCRYPT_CEX3C;
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zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
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zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
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zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
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zdev->short_crt = 0;
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zdev->speed_rating = CEX4C_SPEED_RATING;
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zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
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MSGTYPE06_VARIANT_DEFAULT);
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}
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break;
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}
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if (!zdev)
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return -ENODEV;
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zdev->ap_dev = ap_dev;
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zdev->online = 1;
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ap_dev->reply = &zdev->reply;
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ap_dev->private = zdev;
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rc = zcrypt_device_register(zdev);
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if (rc) {
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zcrypt_msgtype_release(zdev->ops);
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ap_dev->private = NULL;
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zcrypt_device_free(zdev);
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}
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return rc;
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}
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/**
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* This is called to remove the extended CEX4 driver information
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* if an AP device is removed.
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*/
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static void zcrypt_cex4_remove(struct ap_device *ap_dev)
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{
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struct zcrypt_device *zdev = ap_dev->private;
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struct zcrypt_ops *zops;
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if (zdev) {
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zops = zdev->ops;
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zcrypt_device_unregister(zdev);
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zcrypt_msgtype_release(zops);
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}
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}
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int __init zcrypt_cex4_init(void)
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{
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return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4");
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}
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void __exit zcrypt_cex4_exit(void)
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{
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ap_driver_unregister(&zcrypt_cex4_driver);
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}
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module_init(zcrypt_cex4_init);
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module_exit(zcrypt_cex4_exit);
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