[deliverable/linux.git] / drivers / s390 / crypto / zcrypt_cex4.c

/*
 *  Copyright IBM Corp. 2012
 *  Author(s): Holger Dengler <hd@linux.vnet.ibm.com>
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/atomic.h>
#include <linux/uaccess.h>

#include "ap_bus.h"
#include "zcrypt_api.h"
#include "zcrypt_msgtype6.h"
#include "zcrypt_msgtype50.h"
#include "zcrypt_error.h"
#include "zcrypt_cex4.h"

#define CEX4A_MIN_MOD_SIZE	  1	/*    8 bits	*/
#define CEX4A_MAX_MOD_SIZE_2K	256	/* 2048 bits	*/
#define CEX4A_MAX_MOD_SIZE_4K	512	/* 4096 bits	*/

#define CEX4C_MIN_MOD_SIZE	 16	/*  256 bits	*/
#define CEX4C_MAX_MOD_SIZE	512	/* 4096 bits	*/

#define CEX4A_SPEED_RATING	900	 /* TODO new card, new speed rating */
#define CEX4C_SPEED_RATING	6500	 /* TODO new card, new speed rating */
#define CEX4P_SPEED_RATING	7000	 /* TODO new card, new speed rating */
#define CEX5A_SPEED_RATING	450	 /* TODO new card, new speed rating */
#define CEX5C_SPEED_RATING	3250	 /* TODO new card, new speed rating */
#define CEX5P_SPEED_RATING	3500	 /* TODO new card, new speed rating */

#define CEX4A_MAX_MESSAGE_SIZE	MSGTYPE50_CRB3_MAX_MSG_SIZE
#define CEX4C_MAX_MESSAGE_SIZE	MSGTYPE06_MAX_MSG_SIZE

/* Waiting time for requests to be processed.
 * Currently there are some types of request which are not deterministic.
 * But the maximum time limit managed by the stomper code is set to 60sec.
 * Hence we have to wait at least that time period.
 */
#define CEX4_CLEANUP_TIME	(900*HZ)

static struct ap_device_id zcrypt_cex4_ids[] = {
	{ AP_DEVICE(AP_DEVICE_TYPE_CEX4)  },
	{ AP_DEVICE(AP_DEVICE_TYPE_CEX5)  },
	{ /* end of list */ },
};

MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids);
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
		   "Copyright IBM Corp. 2012");
MODULE_LICENSE("GPL");

static int zcrypt_cex4_probe(struct ap_device *ap_dev);
static void zcrypt_cex4_remove(struct ap_device *ap_dev);

static struct ap_driver zcrypt_cex4_driver = {
	.probe = zcrypt_cex4_probe,
	.remove = zcrypt_cex4_remove,
	.ids = zcrypt_cex4_ids,
	.request_timeout = CEX4_CLEANUP_TIME,
};

/**
 * Probe function for CEX4 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_cex4_probe(struct ap_device *ap_dev)
{
	struct zcrypt_device *zdev = NULL;
	int rc = 0;

	switch (ap_dev->device_type) {
	case AP_DEVICE_TYPE_CEX4:
	case AP_DEVICE_TYPE_CEX5:
		if (ap_test_bit(&ap_dev->functions, AP_FUNC_ACCEL)) {
			zdev = zcrypt_device_alloc(CEX4A_MAX_MESSAGE_SIZE);
			if (!zdev)
				return -ENOMEM;
			if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
				zdev->type_string = "CEX4A";
				zdev->speed_rating = CEX4A_SPEED_RATING;
			} else {
				zdev->type_string = "CEX5A";
				zdev->speed_rating = CEX5A_SPEED_RATING;
			}
			zdev->user_space_type = ZCRYPT_CEX3A;
			zdev->min_mod_size = CEX4A_MIN_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 =
					CEX4A_MAX_MOD_SIZE_4K;
				zdev->max_exp_bit_length =
					CEX4A_MAX_MOD_SIZE_4K;
			} else {
				zdev->max_mod_size =
					CEX4A_MAX_MOD_SIZE_2K;
				zdev->max_exp_bit_length =
					CEX4A_MAX_MOD_SIZE_2K;
			}
			zdev->short_crt = 1;
			zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
							   MSGTYPE50_VARIANT_DEFAULT);
		} else if (ap_test_bit(&ap_dev->functions, AP_FUNC_COPRO)) {
			zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
			if (!zdev)
				return -ENOMEM;
			if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
				zdev->type_string = "CEX4C";
				zdev->speed_rating = CEX4C_SPEED_RATING;
			} else {
				zdev->type_string = "CEX5C";
				zdev->speed_rating = CEX5C_SPEED_RATING;
			}
			zdev->user_space_type = ZCRYPT_CEX3C;
			zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
			zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
			zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
			zdev->short_crt = 0;
			zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
							   MSGTYPE06_VARIANT_DEFAULT);
		} else if (ap_test_bit(&ap_dev->functions, AP_FUNC_EP11)) {
			zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
			if (!zdev)
				return -ENOMEM;
			if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
				zdev->type_string = "CEX4P";
				zdev->speed_rating = CEX4P_SPEED_RATING;
			} else {
				zdev->type_string = "CEX5P";
				zdev->speed_rating = CEX5P_SPEED_RATING;
			}
			zdev->user_space_type = ZCRYPT_CEX4;
			zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
			zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
			zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
			zdev->short_crt = 0;
			zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
							MSGTYPE06_VARIANT_EP11);
		}
		break;
	}
	if (!zdev)
		return -ENODEV;
	zdev->ap_dev = ap_dev;
	zdev->online = 1;
	ap_device_init_reply(ap_dev, &zdev->reply);
	ap_dev->private = zdev;
	rc = zcrypt_device_register(zdev);
	if (rc) {
		zcrypt_msgtype_release(zdev->ops);
		ap_dev->private = NULL;
		zcrypt_device_free(zdev);
	}
	return rc;
}

/**
 * This is called to remove the extended CEX4 driver information
 * if an AP device is removed.
 */
static void zcrypt_cex4_remove(struct ap_device *ap_dev)
{
	struct zcrypt_device *zdev = ap_dev->private;
	struct zcrypt_ops *zops;

	if (zdev) {
		zops = zdev->ops;
		zcrypt_device_unregister(zdev);
		zcrypt_msgtype_release(zops);
	}
}

int __init zcrypt_cex4_init(void)
{
	return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4");
}

void __exit zcrypt_cex4_exit(void)
{
	ap_driver_unregister(&zcrypt_cex4_driver);
}

module_init(zcrypt_cex4_init);
module_exit(zcrypt_cex4_exit);
Commit	Line	Data
1e2076f4 HD	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 */
bdea1f1b IT	29	#define CEX4P_SPEED_RATING 7000 /* TODO new card, new speed rating */
	30	#define CEX5A_SPEED_RATING 450 /* TODO new card, new speed rating */
	31	#define CEX5C_SPEED_RATING 3250 /* TODO new card, new speed rating */
	32	#define CEX5P_SPEED_RATING 3500 /* TODO new card, new speed rating */
1e2076f4 HD	33
	34	#define CEX4A_MAX_MESSAGE_SIZE MSGTYPE50_CRB3_MAX_MSG_SIZE
	35	#define CEX4C_MAX_MESSAGE_SIZE MSGTYPE06_MAX_MSG_SIZE
	36
91f3e3ea IT	37	/* Waiting time for requests to be processed.
	38	* Currently there are some types of request which are not deterministic.
	39	* But the maximum time limit managed by the stomper code is set to 60sec.
	40	* Hence we have to wait at least that time period.
	41	*/
c50a160c	42	#define CEX4_CLEANUP_TIME (900*HZ)
1e2076f4 HD	43
	44	static struct ap_device_id zcrypt_cex4_ids[] = {
	45	{ AP_DEVICE(AP_DEVICE_TYPE_CEX4) },
bdea1f1b	46	{ AP_DEVICE(AP_DEVICE_TYPE_CEX5) },
1e2076f4 HD	47	{ /* end of list */ },
	48	};
	49
	50	MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids);
	51	MODULE_AUTHOR("IBM Corporation");
	52	MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
	53	"Copyright IBM Corp. 2012");
	54	MODULE_LICENSE("GPL");
	55
	56	static int zcrypt_cex4_probe(struct ap_device *ap_dev);
	57	static void zcrypt_cex4_remove(struct ap_device *ap_dev);
	58
	59	static struct ap_driver zcrypt_cex4_driver = {
	60	.probe = zcrypt_cex4_probe,
	61	.remove = zcrypt_cex4_remove,
	62	.ids = zcrypt_cex4_ids,
	63	.request_timeout = CEX4_CLEANUP_TIME,
	64	};
	65
	66	/**
	67	* Probe function for CEX4 cards. It always accepts the AP device
	68	* since the bus_match already checked the hardware type.
	69	* @ap_dev: pointer to the AP device.
	70	*/
	71	static int zcrypt_cex4_probe(struct ap_device *ap_dev)
	72	{
	73	struct zcrypt_device *zdev = NULL;
	74	int rc = 0;
	75
	76	switch (ap_dev->device_type) {
	77	case AP_DEVICE_TYPE_CEX4:
bdea1f1b	78	case AP_DEVICE_TYPE_CEX5:
1e2076f4 HD	79	if (ap_test_bit(&ap_dev->functions, AP_FUNC_ACCEL)) {
	80	zdev = zcrypt_device_alloc(CEX4A_MAX_MESSAGE_SIZE);
	81	if (!zdev)
	82	return -ENOMEM;
bdea1f1b IT	83	if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
	84	zdev->type_string = "CEX4A";
	85	zdev->speed_rating = CEX4A_SPEED_RATING;
	86	} else {
	87	zdev->type_string = "CEX5A";
	88	zdev->speed_rating = CEX5A_SPEED_RATING;
	89	}
1e2076f4 HD	90	zdev->user_space_type = ZCRYPT_CEX3A;
	91	zdev->min_mod_size = CEX4A_MIN_MOD_SIZE;
	92	if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) &&
	93	ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) {
	94	zdev->max_mod_size =
	95	CEX4A_MAX_MOD_SIZE_4K;
	96	zdev->max_exp_bit_length =
	97	CEX4A_MAX_MOD_SIZE_4K;
	98	} else {
	99	zdev->max_mod_size =
	100	CEX4A_MAX_MOD_SIZE_2K;
	101	zdev->max_exp_bit_length =
	102	CEX4A_MAX_MOD_SIZE_2K;
	103	}
	104	zdev->short_crt = 1;
1e2076f4 HD	105	zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
	106	MSGTYPE50_VARIANT_DEFAULT);
	107	} else if (ap_test_bit(&ap_dev->functions, AP_FUNC_COPRO)) {
	108	zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
	109	if (!zdev)
	110	return -ENOMEM;
bdea1f1b IT	111	if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
	112	zdev->type_string = "CEX4C";
	113	zdev->speed_rating = CEX4C_SPEED_RATING;
	114	} else {
	115	zdev->type_string = "CEX5C";
	116	zdev->speed_rating = CEX5C_SPEED_RATING;
	117	}
1e2076f4 HD	118	zdev->user_space_type = ZCRYPT_CEX3C;
	119	zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
	120	zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
	121	zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
	122	zdev->short_crt = 0;
1e2076f4 HD	123	zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
1e2076f4 HD	124	MSGTYPE06_VARIANT_DEFAULT);
91f3e3ea IT	125	} else if (ap_test_bit(&ap_dev->functions, AP_FUNC_EP11)) {
	126	zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
	127	if (!zdev)
	128	return -ENOMEM;
bdea1f1b IT	129	if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
	130	zdev->type_string = "CEX4P";
	131	zdev->speed_rating = CEX4P_SPEED_RATING;
	132	} else {
	133	zdev->type_string = "CEX5P";
	134	zdev->speed_rating = CEX5P_SPEED_RATING;
	135	}
91f3e3ea IT	136	zdev->user_space_type = ZCRYPT_CEX4;
	137	zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
	138	zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
	139	zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
	140	zdev->short_crt = 0;
91f3e3ea IT	141	zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
91f3e3ea IT	142	MSGTYPE06_VARIANT_EP11);
1e2076f4 HD	143	}
	144	break;
	145	}
	146	if (!zdev)
	147	return -ENODEV;
	148	zdev->ap_dev = ap_dev;
	149	zdev->online = 1;
d6d86c57	150	ap_device_init_reply(ap_dev, &zdev->reply);
1e2076f4 HD	151	ap_dev->private = zdev;
	152	rc = zcrypt_device_register(zdev);
	153	if (rc) {
	154	zcrypt_msgtype_release(zdev->ops);
	155	ap_dev->private = NULL;
	156	zcrypt_device_free(zdev);
	157	}
	158	return rc;
	159	}
	160
	161	/**
	162	* This is called to remove the extended CEX4 driver information
	163	* if an AP device is removed.
	164	*/
	165	static void zcrypt_cex4_remove(struct ap_device *ap_dev)
	166	{
	167	struct zcrypt_device *zdev = ap_dev->private;
	168	struct zcrypt_ops *zops;
	169
	170	if (zdev) {
	171	zops = zdev->ops;
	172	zcrypt_device_unregister(zdev);
	173	zcrypt_msgtype_release(zops);
	174	}
	175	}
	176
	177	int __init zcrypt_cex4_init(void)
	178	{
	179	return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4");
	180	}
	181
	182	void __exit zcrypt_cex4_exit(void)
	183	{
	184	ap_driver_unregister(&zcrypt_cex4_driver);
	185	}
	186
	187	module_init(zcrypt_cex4_init);
	188	module_exit(zcrypt_cex4_exit);