/*
 *  zcrypt 2.1.0
 *
 *  Copyright IBM Corp. 2001, 2006
 *  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>
 *
 * 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.
 */

#ifndef _ZCRYPT_ERROR_H_
#define _ZCRYPT_ERROR_H_

#include <linux/atomic.h>
#include "zcrypt_debug.h"
#include "zcrypt_api.h"

/**
 * Reply Messages
 *
 * Error reply messages are of two types:
 *    82:  Error (see below)
 *    88:  Error (see below)
 * Both type 82 and type 88 have the same structure in the header.
 *
 * Request reply messages are of three known types:
 *    80:  Reply from a Type 50 Request (see CEX2A-RELATED STRUCTS)
 *    84:  Reply from a Type 4 Request (see PCICA-RELATED STRUCTS)
 *    86:  Reply from a Type 6 Request (see PCICC/PCIXCC/CEX2C-RELATED STRUCTS)
 *
 */
struct error_hdr {
	unsigned char reserved1;	/* 0x00			*/
	unsigned char type;		/* 0x82 or 0x88		*/
	unsigned char reserved2[2];	/* 0x0000		*/
	unsigned char reply_code;	/* reply code		*/
	unsigned char reserved3[3];	/* 0x000000		*/
};

#define TYPE82_RSP_CODE 0x82
#define TYPE88_RSP_CODE 0x88

#define REP82_ERROR_MACHINE_FAILURE  0x10
#define REP82_ERROR_PREEMPT_FAILURE  0x12
#define REP82_ERROR_CHECKPT_FAILURE  0x14
#define REP82_ERROR_MESSAGE_TYPE     0x20
#define REP82_ERROR_INVALID_COMM_CD  0x21	/* Type 84	*/
#define REP82_ERROR_INVALID_MSG_LEN  0x23
#define REP82_ERROR_RESERVD_FIELD    0x24	/* was 0x50	*/
#define REP82_ERROR_FORMAT_FIELD     0x29
#define REP82_ERROR_INVALID_COMMAND  0x30
#define REP82_ERROR_MALFORMED_MSG    0x40
#define REP82_ERROR_RESERVED_FIELDO  0x50	/* old value	*/
#define REP82_ERROR_WORD_ALIGNMENT   0x60
#define REP82_ERROR_MESSAGE_LENGTH   0x80
#define REP82_ERROR_OPERAND_INVALID  0x82
#define REP82_ERROR_OPERAND_SIZE     0x84
#define REP82_ERROR_EVEN_MOD_IN_OPND 0x85
#define REP82_ERROR_RESERVED_FIELD   0x88
#define REP82_ERROR_TRANSPORT_FAIL   0x90
#define REP82_ERROR_PACKET_TRUNCATED 0xA0
#define REP82_ERROR_ZERO_BUFFER_LEN  0xB0

#define REP88_ERROR_MODULE_FAILURE   0x10

#define REP88_ERROR_MESSAGE_TYPE     0x20
#define REP88_ERROR_MESSAGE_MALFORMD 0x22
#define REP88_ERROR_MESSAGE_LENGTH   0x23
#define REP88_ERROR_RESERVED_FIELD   0x24
#define REP88_ERROR_KEY_TYPE	     0x34
#define REP88_ERROR_INVALID_KEY      0x82	/* CEX2A	*/
#define REP88_ERROR_OPERAND	     0x84	/* CEX2A	*/
#define REP88_ERROR_OPERAND_EVEN_MOD 0x85	/* CEX2A	*/

static inline int convert_error(struct zcrypt_device *zdev,
				struct ap_message *reply)
{
	struct error_hdr *ehdr = reply->message;

	switch (ehdr->reply_code) {
	case REP82_ERROR_OPERAND_INVALID:
	case REP82_ERROR_OPERAND_SIZE:
	case REP82_ERROR_EVEN_MOD_IN_OPND:
	case REP88_ERROR_MESSAGE_MALFORMD:
	//   REP88_ERROR_INVALID_KEY		// '82' CEX2A
	//   REP88_ERROR_OPERAND		// '84' CEX2A
	//   REP88_ERROR_OPERAND_EVEN_MOD	// '85' CEX2A
		/* Invalid input data. */
		return -EINVAL;
	case REP82_ERROR_MESSAGE_TYPE:
	//   REP88_ERROR_MESSAGE_TYPE		// '20' CEX2A
		/*
		 * To sent a message of the wrong type is a bug in the
		 * device driver. Send error msg, disable the device
		 * and then repeat the request.
		 */
		atomic_set(&zcrypt_rescan_req, 1);
		zdev->online = 0;
		pr_err("Cryptographic device %x failed and was set offline\n",
		       zdev->ap_dev->qid);
		ZCRYPT_DBF_DEV(DBF_ERR, zdev, "dev%04xo%drc%d",
			zdev->ap_dev->qid, zdev->online, ehdr->reply_code);
		return -EAGAIN;
	case REP82_ERROR_TRANSPORT_FAIL:
	case REP82_ERROR_MACHINE_FAILURE:
	//   REP88_ERROR_MODULE_FAILURE		// '10' CEX2A
		/* If a card fails disable it and repeat the request. */
		atomic_set(&zcrypt_rescan_req, 1);
		zdev->online = 0;
		pr_err("Cryptographic device %x failed and was set offline\n",
		       zdev->ap_dev->qid);
		ZCRYPT_DBF_DEV(DBF_ERR, zdev, "dev%04xo%drc%d",
			zdev->ap_dev->qid, zdev->online, ehdr->reply_code);
		return -EAGAIN;
	default:
		zdev->online = 0;
		pr_err("Cryptographic device %x failed and was set offline\n",
		       zdev->ap_dev->qid);
		ZCRYPT_DBF_DEV(DBF_ERR, zdev, "dev%04xo%drc%d",
			zdev->ap_dev->qid, zdev->online, ehdr->reply_code);
		return -EAGAIN;	/* repeat the request on a different device. */
	}
}

#endif /* _ZCRYPT_ERROR_H_ */