/*
 *  drivers/s390/char/tape_34xx.h
 *    standard tape device functions for ibm tapes.
 *
 *  S390 and zSeries version
 *    Copyright (C) 2001,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 *		 Tuan Ngo-Anh <ngoanh@de.ibm.com>
 *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
 */

#ifndef _TAPE_STD_H
#define _TAPE_STD_H

#include <asm/tape390.h>

/*
 * Biggest block size to handle. Currently 64K because we only build
 * channel programs without data chaining.
 */
#define MAX_BLOCKSIZE   65535

/*
 * The CCW commands for the Tape type of command.
 */
#define INVALID_00		0x00	/* Invalid cmd */
#define BACKSPACEBLOCK		0x27	/* Back Space block */
#define BACKSPACEFILE		0x2f	/* Back Space file */
#define DATA_SEC_ERASE		0x97	/* Data security erase */
#define ERASE_GAP		0x17	/* Erase Gap */
#define FORSPACEBLOCK		0x37	/* Forward space block */
#define FORSPACEFILE		0x3F	/* Forward Space file */
#define FORCE_STREAM_CNT	0xEB	/* Forced streaming count # */
#define NOP			0x03	/* No operation	*/
#define READ_FORWARD		0x02	/* Read forward */
#define REWIND			0x07	/* Rewind */
#define REWIND_UNLOAD		0x0F	/* Rewind and Unload */
#define SENSE			0x04	/* Sense */
#define NEW_MODE_SET		0xEB	/* Guess it is Mode set */
#define WRITE_CMD		0x01	/* Write */
#define WRITETAPEMARK		0x1F	/* Write Tape Mark */

#define ASSIGN			0xB7	/* 3420 REJECT,3480 OK	*/
#define CONTROL_ACCESS		0xE3	/* Set high speed */
#define DIAG_MODE_SET		0x0B	/* 3420 NOP, 3480 REJECT */
#define LOAD_DISPLAY		0x9F	/* 3420 REJECT,3480 OK */
#define LOCATE			0x4F	/* 3420 REJ, 3480 NOP */
#define LOOP_WRITE_TO_READ	0x8B	/* 3480 REJECT */
#define MODE_SET_DB		0xDB	/* 3420 REJECT,3480 OK */
#define MODE_SET_C3		0xC3	/* for 3420 */
#define MODE_SET_CB		0xCB	/* for 3420 */
#define MODE_SET_D3		0xD3	/* for 3420 */
#define READ_BACKWARD		0x0C	/* */
#define READ_BLOCK_ID		0x22	/* 3420 REJECT,3480 OK */
#define READ_BUFFER		0x12	/* 3420 REJECT,3480 OK */
#define READ_BUFF_LOG		0x24	/* 3420 REJECT,3480 OK */
#define RELEASE			0xD4	/* 3420 NOP, 3480 REJECT */
#define REQ_TRK_IN_ERROR	0x1B	/* 3420 NOP, 3480 REJECT */
#define RESERVE			0xF4	/* 3420 NOP, 3480 REJECT */
#define SENSE_GROUP_ID		0x34	/* 3420 REJECT,3480 OK */
#define SENSE_ID		0xE4	/* 3420 REJECT,3480 OK */
#define READ_DEV_CHAR		0x64	/* Read device characteristics */
#define SET_DIAGNOSE		0x4B	/* 3420 NOP, 3480 REJECT */
#define SET_GROUP_ID		0xAF	/* 3420 REJECT,3480 OK */
#define SET_TAPE_WRITE_IMMED	0xC3	/* for 3480 */
#define SUSPEND			0x5B	/* 3420 REJ, 3480 NOP */
#define SYNC			0x43	/* Synchronize (flush buffer) */
#define UNASSIGN		0xC7	/* 3420 REJECT,3480 OK */
#define PERF_SUBSYS_FUNC	0x77	/* 3490 CMD */
#define READ_CONFIG_DATA	0xFA	/* 3490 CMD */
#define READ_MESSAGE_ID		0x4E	/* 3490 CMD */
#define READ_SUBSYS_DATA	0x3E	/* 3490 CMD */
#define SET_INTERFACE_ID	0x73	/* 3490 CMD */

#define SENSE_COMMAND_REJECT		0x80
#define SENSE_INTERVENTION_REQUIRED	0x40
#define SENSE_BUS_OUT_CHECK		0x20
#define SENSE_EQUIPMENT_CHECK		0x10
#define SENSE_DATA_CHECK		0x08
#define SENSE_OVERRUN			0x04
#define SENSE_DEFERRED_UNIT_CHECK	0x02
#define SENSE_ASSIGNED_ELSEWHERE	0x01

#define SENSE_LOCATE_FAILURE		0x80
#define SENSE_DRIVE_ONLINE		0x40
#define SENSE_RESERVED			0x20
#define SENSE_RECORD_SEQUENCE_ERR	0x10
#define SENSE_BEGINNING_OF_TAPE		0x08
#define SENSE_WRITE_MODE		0x04
#define SENSE_WRITE_PROTECT		0x02
#define SENSE_NOT_CAPABLE		0x01

#define SENSE_CHANNEL_ADAPTER_CODE	0xE0
#define SENSE_CHANNEL_ADAPTER_LOC	0x10
#define SENSE_REPORTING_CU		0x08
#define SENSE_AUTOMATIC_LOADER		0x04
#define SENSE_TAPE_SYNC_MODE		0x02
#define SENSE_TAPE_POSITIONING		0x01

/* discipline functions */
struct tape_request *tape_std_read_block(struct tape_device *, size_t);
void tape_std_read_backward(struct tape_device *device,
			    struct tape_request *request);
struct tape_request *tape_std_write_block(struct tape_device *, size_t);
struct tape_request *tape_std_bread(struct tape_device *, struct request *);
void tape_std_free_bread(struct tape_request *);
void tape_std_check_locate(struct tape_device *, struct tape_request *);
struct tape_request *tape_std_bwrite(struct request *,
				     struct tape_device *, int);

/* Some non-mtop commands. */
int tape_std_assign(struct tape_device *);
int tape_std_unassign(struct tape_device *);
int tape_std_read_block_id(struct tape_device *device, __u64 *id);
int tape_std_display(struct tape_device *, struct display_struct *disp);
int tape_std_terminate_write(struct tape_device *);

/* Standard magnetic tape commands. */
int tape_std_mtbsf(struct tape_device *, int);
int tape_std_mtbsfm(struct tape_device *, int);
int tape_std_mtbsr(struct tape_device *, int);
int tape_std_mtcompression(struct tape_device *, int);
int tape_std_mteom(struct tape_device *, int);
int tape_std_mterase(struct tape_device *, int);
int tape_std_mtfsf(struct tape_device *, int);
int tape_std_mtfsfm(struct tape_device *, int);
int tape_std_mtfsr(struct tape_device *, int);
int tape_std_mtload(struct tape_device *, int);
int tape_std_mtnop(struct tape_device *, int);
int tape_std_mtoffl(struct tape_device *, int);
int tape_std_mtreset(struct tape_device *, int);
int tape_std_mtreten(struct tape_device *, int);
int tape_std_mtrew(struct tape_device *, int);
int tape_std_mtsetblk(struct tape_device *, int);
int tape_std_mtunload(struct tape_device *, int);
int tape_std_mtweof(struct tape_device *, int);

/* Event handlers */
void tape_std_default_handler(struct tape_device *);
void tape_std_unexpect_uchk_handler(struct tape_device *);
void tape_std_irq(struct tape_device *);
void tape_std_process_eov(struct tape_device *);

// the error recovery stuff:
void tape_std_error_recovery(struct tape_device *);
void tape_std_error_recovery_has_failed(struct tape_device *,int error_id);
void tape_std_error_recovery_succeded(struct tape_device *);
void tape_std_error_recovery_do_retry(struct tape_device *);
void tape_std_error_recovery_read_opposite(struct tape_device *);
void tape_std_error_recovery_HWBUG(struct tape_device *, int condno);

#endif // _TAPE_STD_H