2813 lines
85 KiB
C
2813 lines
85 KiB
C
/* $Id: tpqic02.c,v 1.10 1997/01/26 07:13:20 davem Exp $
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*
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* Driver for tape drive support for Linux-i386
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*
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* Copyright (c) 1992--1996 by H. H. Bergman. All rights reserved.
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* Current e-mail address: hennus@cybercomm.nl
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*
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* Distribution of this program in executable form is only allowed if
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* all of the corresponding source files are made available through the same
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* medium at no extra cost.
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*
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* I will not accept any responsibility for damage caused directly or
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* indirectly by this program, or code derived from this program.
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*
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* Use this code at your own risk. Don't blame me if it destroys your data!
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* Make sure you have a backup before you try this code.
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*
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* If you make changes to my code and redistribute it in source or binary
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* form you must make it clear to even casual users of your code that you
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* have modified my code, clearly point out what the changes exactly are
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* (preferably in the form of a context diff file), how to undo your changes,
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* where the original can be obtained, and that complaints/requests about the
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* modified code should be directed to you instead of me.
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*
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* This driver was partially inspired by the 'wt' driver in the 386BSD
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* source distribution, which carries the following copyright notice:
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*
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* You are not allowed to change this line nor the text above.
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*
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* 2001/02/26 Minor s/suser/capable/
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*
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* 1996/10/10 Emerald changes
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*
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* 1996/05/21 Misc changes+merges+cleanups + I/O reservations
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*
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* 1996/05/20 Module support patches submitted by Brian McCauley.
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*
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* 1994/05/03 Initial attempt at Mountain support for the Mountain 7150.
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* Based on patches provided by Erik Jacobson. Still incomplete, I suppose.
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*
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* 1994/02/07 Archive changes & some cleanups by Eddy Olk.
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*
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* 1994/01/19 Speed measuring stuff moved from aperf.h to delay.h.
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* BogoMips (tm) introduced by Linus.
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*
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* 1993/01/25 Kernel udelay. Eof fixups.
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*
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* 1992/09/19 Some changes based on patches by Eddy Olk to support
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* Archive SC402/SC499R controller cards.
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*
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* 1992/05/27 First release.
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*
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* 1992/05/26 Initial version. Copyright H. H. Bergman 1992
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*/
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/* After the legalese, now the important bits:
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*
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* This is a driver for the Wangtek 5150 tape drive with
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* a QIC-02 controller for ISA-PC type computers.
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* Hopefully it will work with other QIC-02 tape drives as well.
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*
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* Make sure your setup matches the configuration parameters.
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* Also, be careful to avoid IO conflicts with other devices!
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*/
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/*
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#define TDEBUG
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*/
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#define REALLY_SLOW_IO /* it sure is ... */
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#include <linux/module.h>
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#include <linux/config.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/errno.h>
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#include <linux/mtio.h>
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#include <linux/fcntl.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/tpqic02.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/smp_lock.h>
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#include <linux/devfs_fs_kernel.h>
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#include <linux/device.h>
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#include <asm/dma.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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/* check existence of required configuration parameters */
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#if !defined(QIC02_CMD_PORT) || !defined(QIC02_TAPE_IRQ) || !defined(QIC02_TAPE_DMA)
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# error qic02_tape configuration error
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#endif
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#define TPQIC02_NAME "tpqic02"
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/* Linux outb() commands have (value,port) as parameters.
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* One might expect (port,value) instead, so beware!
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*/
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#ifdef CONFIG_QIC02_DYNCONF
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/* This holds the dynamic configuration info for the interface
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* card+drive info if runtime configuration has been selected.
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*/
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static struct mtconfiginfo qic02_tape_dynconf = {
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/* user settable */
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0, 0, BOGUS_IRQ, 0, 0, TPQD_DEFAULT_FLAGS,
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};
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static struct qic02_ccb qic02_tape_ccb; /* private stuff */
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#else
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static unsigned long qic02_tape_debug = TPQD_DEFAULT_FLAGS;
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# if ((QIC02_TAPE_IFC!=WANGTEK) && (QIC02_TAPE_IFC!=ARCHIVE) && (QIC02_TAPE_IFC!=MOUNTAIN))
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# error No valid interface card specified
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# endif
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#endif /* CONFIG_QIC02_DYNCONF */
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static int ctlbits; /* control reg bits for tape interface */
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static wait_queue_head_t qic02_tape_transfer; /* sync rw with interrupts */
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static struct mtget ioctl_status; /* current generic status */
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static struct tpstatus tperror; /* last drive status */
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static char rcs_revision[] = "$Revision: 1.10 $";
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static char rcs_date[] = "$Date: 1997/01/26 07:13:20 $";
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/* Flag bits for status and outstanding requests.
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* (Could all be put in one bit-field-struct.)
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* Some variables need `volatile' because they may be modified
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* by an interrupt.
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*/
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static flag status_dead = YES; /* device is legally dead until proven alive */
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static flag status_zombie = YES; /* it's `zombie' until irq/dma allocated */
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static flag status_bytes_wr = NO; /* write FM at close or not */
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static flag status_bytes_rd = NO; /* (rd|wr) used for rewinding */
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static volatile unsigned long status_cmd_pending; /* cmd in progress */
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static flag status_expect_int = NO; /* ready for interrupts */
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static flag status_timer_on = NO; /* using time-out */
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static int status_error; /* int handler may detect error */
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static flag status_eof_detected = NO; /* end of file */
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static flag status_eom_detected = NO; /* end of recorded media */
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static flag status_eot_detected = NO; /* end of tape */
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static flag doing_read = NO;
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static flag doing_write = NO;
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static unsigned long dma_bytes_todo;
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static unsigned long dma_bytes_done;
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static volatile unsigned dma_mode; /* !=0 also means DMA in use */
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static flag need_rewind = YES;
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static int current_type;
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static int extra_blocks_left = BLOCKS_BEYOND_EW;
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static struct timer_list tp_timer;
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static unsigned long tape_open; /* Guard open one only */
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static DECLARE_MUTEX(tape_op); /* Serialize tape operations */
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/* return_*_eof:
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* NO: not at EOF,
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* YES: tell app EOF was reached (return 0).
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*
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* return_*_eof==YES && reported_*_eof==NO ==>
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* return current buffer, next time(s) return EOF.
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*
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* return_*_eof==YES && reported_*_eof==YES ==>
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* at EOF and application knows it, so we can
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* move on to the next file.
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*
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*/
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static flag return_read_eof = NO; /* set to signal app EOF was reached */
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static flag return_write_eof = NO;
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static flag reported_read_eof = NO; /* set when we've done that */
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static flag reported_write_eof = NO;
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/* This is for doing `mt seek <blocknr>' */
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static char seek_addr_buf[AR_SEEK_BUF_SIZE];
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/* In write mode, we have to write a File Mark after the last block written,
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* when the tape device is closed. Tape repositioning and reading in write
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* mode is allowed as long as no actual writing has been done. After writing
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* the File Mark, repositioning and reading are allowed again.
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*/
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static int mode_access; /* access mode: READ or WRITE */
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static int qic02_get_resources(void);
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static void qic02_release_resources(void);
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/* This is a pointer to the actual kernel buffer where the interrupt routines
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* read from/write to. It is needed because the DMA channels 1 and 3 cannot
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* always access the user buffers. [The kernel buffer must reside in the
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* lower 16MBytes of system memory because of the DMA controller.] The user
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* must ensure that a large enough buffer is passed to the kernel, in order
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* to reduce tape repositioning wear and tear.
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*/
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static void *buffaddr; /* virtual address of buffer */
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/* This translates minor numbers to the corresponding recording format: */
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static const char *format_names[] = {
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"not set", /* for dumb drives unable to handle format selection */
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"11", /* extinct */
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"24",
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"120",
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"150",
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"300", /* untested. */
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"600" /* untested. */
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};
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static struct class_simple *tpqic02_class;
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/* `exception_list' is needed for exception status reporting.
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* Exceptions 1..14 are defined by QIC-02 rev F.
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* The drive status is matched sequentially to each entry,
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* ignoring irrelevant bits, until a match is found. If no
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* match is found, exception number 0 is used. (That should of
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* course never happen...) The original table was based on the
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* "Exception Status Summary" in QIC-02 rev F, but some changes
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* were required to make it work with real-world drives.
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*
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* Exception 2 (CNI) is changed to also cover status 0x00e0 (mask USL),
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* Exception 4 (EOM) is changed to also cover status 0x8288 (mask EOR),
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* Exception 11 (FIL) is changed to also cover status 0x0089 (mask EOM).
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* Exception 15 (EOR) is added for seek-to-end-of-data (catch EOR),
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* Exception 16 (BOM) is added for beginning-of-media (catch BOM).
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*
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* Had to swap EXC_NDRV and EXC_NCART to ensure that extended EXC_NCART
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* (because of the incorrect Wangtek status code) doesn't catch the
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* EXC_NDRV first.
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*/
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static struct exception_list_type {
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unsigned short mask, code;
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const char *msg;
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/* EXC_nr attribute should match with tpqic02.h */
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} exception_list[] = {
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{ 0, 0, "Unknown exception status code", /* extra: 0 */ },
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{ ~(0), TP_ST0 | TP_CNI | TP_USL | TP_WRP, "Drive not online" /* 1 */ }, /* Drive presence goes before cartridge presence. */
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{ ~(TP_WRP | TP_USL), TP_ST0 | TP_CNI,
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/* My Wangtek 5150EQ sometimes reports a status code
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* of 0x00e0, which is not a valid exception code, but
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* I think it should be recognized as "NO CARTRIDGE".
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*/
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"Cartridge not in place" /* 2 */ },
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{ (unsigned short) ~(TP_ST1 | TP_BOM), (TP_ST0 | TP_WRP), "Write protected cartridge" /* 3 */ },
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{ (unsigned short) ~(TP_ST1 | TP_EOR), (TP_ST0 | TP_EOM), "End of media" /* 4 */ },
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{ ~TP_WRP, TP_ST0 | TP_UDA | TP_ST1 | TP_BOM, "Read or Write abort. Rewind tape." /* 5 */ },
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{ ~TP_WRP, TP_ST0 | TP_UDA, "Read error. Bad block transferred." /* 6 */ },
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{ ~TP_WRP, TP_ST0 | TP_UDA | TP_BNL, "Read error. Filler block transferred." /* 7 */ },
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{ ~TP_WRP, TP_ST0 | TP_UDA | TP_BNL | TP_ST1 | TP_NDT, "Read error. No data detected." /* 8 */ },
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{ ~TP_WRP, TP_ST0 | TP_EOM | TP_UDA | TP_BNL | TP_ST1 | TP_NDT, "Read error. No data detected. EOM." /* 9 */ },
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{ ~(TP_WRP | TP_MBD | TP_PAR | TP_EOR), TP_ST0 | TP_UDA | TP_BNL | TP_ST1 | TP_NDT | TP_BOM, "Read error. No data detected. BOM." /* 10 */ },
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{ ~(TP_WRP | TP_EOM), TP_ST0 | TP_FIL,
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/* Status 0x0089 (EOM & FM) is viewed as an FM,
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* because it can only happen during a read.
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* EOM is checked separately for an FM condition.
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*/
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"File mark detected" /* 11 */ },
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{ ~(TP_ST0 | TP_CNI | TP_USL | TP_WRP | TP_BOM), TP_ST1 | TP_ILL, "Illegal command" /* 12 */ },
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{ ~(TP_ST0 | TP_CNI | TP_USL | TP_WRP | TP_BOM), TP_ST1 | TP_POR, "Reset occurred" /* 13 */ },
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{ ~TP_WRP, TP_ST0 | TP_FIL | TP_MBD, /* NOTE: ST1 not set! */ "Marginal block detected" /* 14 */ },
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{ ~(TP_ST0 | TP_WRP | TP_EOM | TP_UDA | TP_BNL | TP_FIL | TP_NDT), TP_ST1 | TP_EOR, /********** Is the extra TP_NDT really needed Eddy? **********/ "End of recorded media" /* extra: 15 */ },
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/* 15 is returned when SEEKEOD completes successfully */
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{ ~(TP_WRP | TP_ST0), TP_ST1 | TP_BOM, "Beginning of media" /* extra: 16 */ }
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};
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#define NR_OF_EXC (sizeof(exception_list)/sizeof(struct exception_list_type))
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/* Compare expected struct size and actual struct size. This
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* is useful to catch programs compiled with old #includes.
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*/
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#define CHECK_IOC_SIZE(structure) \
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if (_IOC_SIZE(iocmd) != sizeof(struct structure)) { \
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tpqputs(TPQD_ALWAYS, "sizeof(struct " #structure \
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") does not match!"); \
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return -EFAULT; \
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} \
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static void tpqputs(unsigned long flags, const char *s)
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{
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if ((flags & TPQD_ALWAYS) || (flags & QIC02_TAPE_DEBUG))
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printk(TPQIC02_NAME ": %s\n", s);
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} /* tpqputs */
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/* Init control register bits on interface card.
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* For Archive, interrupts must be enabled explicitly.
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* Wangtek interface card requires ONLINE to be set, Archive SC402/SC499R
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* cards keep it active all the time.
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*/
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static void ifc_init(void)
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{
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if (QIC02_TAPE_IFC == WANGTEK) { /* || (QIC02_TAPE_IFC == EVEREX) */
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ctlbits = WT_CTL_ONLINE; /* online */
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outb_p(ctlbits, QIC02_CTL_PORT);
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} else if (QIC02_TAPE_IFC == ARCHIVE) {
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ctlbits = 0; /* no interrupts yet */
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outb_p(ctlbits, QIC02_CTL_PORT);
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outb_p(0, AR_RESET_DMA_PORT); /* dummy write to reset DMA */
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} else { /* MOUNTAIN */
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ctlbits = MTN_CTL_ONLINE; /* online, and logic enabled */
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outb_p(ctlbits, QIC02_CTL_PORT);
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}
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} /* ifc_init */
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static void report_qic_exception(unsigned n)
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{
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if (n >= NR_OF_EXC) {
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tpqputs(TPQD_ALWAYS, "Oops -- report_qic_exception");
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n = 0;
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}
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if (TPQDBG(SENSE_TEXT) || n == 0)
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printk(TPQIC02_NAME ": sense: %s\n", exception_list[n].msg);
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} /* report_qic_exception */
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/* Try to map the drive-exception bits `s' to a predefined "exception number",
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* by comparing the significant exception bits for each entry in the
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* exception table (`exception_list[]').
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* It is assumed that s!=0.
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*/
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static int decode_qic_exception_nr(unsigned s)
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{
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int i;
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for (i = 1; i < NR_OF_EXC; i++) {
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if ((s & exception_list[i].mask) == exception_list[i].code) {
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return i;
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}
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}
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printk(TPQIC02_NAME ": decode_qic_exception_nr: exception(%x) not recognized\n", s);
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return 0;
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} /* decode_qic_exception_nr */
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/* Perform appropriate action for certain exceptions.
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* should return a value to indicate stop/continue (in case of bad blocks)
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*/
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static void handle_qic_exception(int exnr, int exbits)
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{
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if (exnr == EXC_NCART) {
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/* Cartridge was changed. Redo sense().
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* EXC_NCART should be handled in open().
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* It is not permitted to remove the tape while
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* the tape driver has open files.
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*/
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need_rewind = YES;
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status_eof_detected = NO;
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status_eom_detected = NO;
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} else if (exnr == EXC_XFILLER) {
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tpqputs(TPQD_ALWAYS,
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"[Bad block -- filler data transferred.]");
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} else if (exnr == EXC_XBAD) {
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tpqputs(TPQD_ALWAYS, "[CRC failed!]");
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} else if (exnr == EXC_MARGINAL) {
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/* A marginal block behaves much like a FM.
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* User may continue reading, if desired.
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*/
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tpqputs(TPQD_ALWAYS, "[Marginal block]");
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doing_read = NO;
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} else if (exnr == EXC_FM) {
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doing_read = NO;
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}
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} /* handle_qic_exception */
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static inline int is_exception(void)
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{
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return (inb(QIC02_STAT_PORT) & QIC02_STAT_EXCEPTION) == 0;
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} /* is_exception */
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/* Reset the tape drive and controller.
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* When reset fails, it marks the drive as dead and all
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* requests (except reset) are to be ignored (ENXIO).
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*/
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static int tape_reset(int verbose)
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{
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ifc_init(); /* reset interface card */
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/* assert reset */
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if (QIC02_TAPE_IFC == MOUNTAIN) {
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outb_p(ctlbits & ~MTN_QIC02_CTL_RESET_NOT, QIC02_CTL_PORT);
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} else { /* WANGTEK, ARCHIVE */
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outb_p(ctlbits | QIC02_CTL_RESET, QIC02_CTL_PORT);
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}
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/* Next, we need to wait >=25 usec. */
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udelay(30);
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/* after reset, we will be at BOT (modulo an automatic rewind) */
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status_eof_detected = NO;
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status_eom_detected = NO;
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status_cmd_pending = 0;
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need_rewind = YES;
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doing_read = doing_write = NO;
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ioctl_status.mt_fileno = ioctl_status.mt_blkno = 0;
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/* de-assert reset */
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if (QIC02_TAPE_IFC == MOUNTAIN) {
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outb_p(ctlbits | MTN_QIC02_CTL_RESET_NOT, QIC02_CTL_PORT);
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} else {
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outb_p(ctlbits & ~QIC02_CTL_RESET, QIC02_CTL_PORT);
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}
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/* KLUDGE FOR G++ BUG */
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{
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int stat = inb_p(QIC02_STAT_PORT);
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status_dead = ((stat & QIC02_STAT_RESETMASK) != QIC02_STAT_RESETVAL);
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}
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/* if successful, inb(STAT) returned RESETVAL */
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if (status_dead == YES)
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printk(TPQIC02_NAME ": reset failed!\n");
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else if (verbose)
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printk(TPQIC02_NAME ": reset successful\n");
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return (status_dead == YES) ? TE_DEAD : TE_OK;
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} /* tape_reset */
|
|
|
|
|
|
|
|
/* Notify tape drive of a new command. It only waits for the
|
|
* command to be accepted, not for the actual command to complete.
|
|
*
|
|
* Before calling this routine, QIC02_CMD_PORT must have been loaded
|
|
* with the command to be executed.
|
|
* After this routine, the exception bit must be checked.
|
|
* This routine is also used by rdstatus(), so in that case, any exception
|
|
* must be ignored (`ignore_ex' flag).
|
|
*/
|
|
static int notify_cmd(char cmd, short ignore_ex)
|
|
{
|
|
int i;
|
|
|
|
outb_p(cmd, QIC02_CMD_PORT); /* output the command */
|
|
|
|
/* wait 1 usec before asserting /REQUEST */
|
|
udelay(1);
|
|
|
|
if ((!ignore_ex) && is_exception()) {
|
|
tpqputs(TPQD_ALWAYS, "*** exception detected in notify_cmd");
|
|
/** force a reset here **/
|
|
if (tape_reset(1) == TE_DEAD)
|
|
return TE_DEAD;
|
|
if (is_exception()) {
|
|
tpqputs(TPQD_ALWAYS, "exception persists after reset.");
|
|
tpqputs(TPQD_ALWAYS, " ^ exception ignored.");
|
|
}
|
|
}
|
|
|
|
outb_p(ctlbits | QIC02_CTL_REQUEST, QIC02_CTL_PORT); /* set request bit */
|
|
i = TAPE_NOTIFY_TIMEOUT;
|
|
/* The specs say this takes about 500 usec, but there is no upper limit!
|
|
* If the drive were busy retensioning or something like that,
|
|
* it could be *much* longer!
|
|
*/
|
|
while ((inb_p(QIC02_STAT_PORT) & QIC02_STAT_READY) && (--i > 0))
|
|
udelay(1);
|
|
/* wait for ready */
|
|
if (i == 0) {
|
|
tpqputs(TPQD_ALWAYS, "timed out waiting for ready in notify_cmd");
|
|
status_dead = YES;
|
|
return TE_TIM;
|
|
}
|
|
|
|
outb_p(ctlbits & ~QIC02_CTL_REQUEST, QIC02_CTL_PORT); /* reset request bit */
|
|
i = TAPE_NOTIFY_TIMEOUT;
|
|
/* according to the specs this one should never time-out */
|
|
while (((inb_p(QIC02_STAT_PORT) & QIC02_STAT_READY) == 0) && (--i > 0))
|
|
udelay(1);
|
|
/* wait for not ready */
|
|
if (i == 0) {
|
|
tpqputs(TPQD_ALWAYS, "timed out waiting for !ready in notify_cmd");
|
|
status_dead = YES;
|
|
return TE_TIM;
|
|
}
|
|
/* command accepted */
|
|
return TE_OK;
|
|
} /* notify_cmd */
|
|
|
|
|
|
|
|
/* Wait for a command to complete, with timeout */
|
|
static int wait_for_ready(time_t timeout)
|
|
{
|
|
int stat;
|
|
unsigned long spin_t;
|
|
|
|
/* Wait for ready or exception, without driving the loadavg up too much.
|
|
* In most cases, the tape drive already has READY asserted,
|
|
* so optimize for that case.
|
|
*
|
|
* First, busy wait a few usec:
|
|
*/
|
|
spin_t = 50;
|
|
while (((stat = inb_p(QIC02_STAT_PORT) & QIC02_STAT_MASK) == QIC02_STAT_MASK) && (--spin_t > 0))
|
|
udelay(1);
|
|
if ((stat & QIC02_STAT_READY) == 0)
|
|
return TE_OK; /* covers 99.99% of all calls */
|
|
|
|
/* Then use schedule() a few times */
|
|
spin_t = 3; /* max 0.03 sec busy waiting */
|
|
if (spin_t > timeout)
|
|
spin_t = timeout;
|
|
timeout -= spin_t;
|
|
spin_t += jiffies;
|
|
|
|
/* FIXME...*/
|
|
while (((stat = inb_p(QIC02_STAT_PORT) & QIC02_STAT_MASK) == QIC02_STAT_MASK) && time_before(jiffies, spin_t))
|
|
{
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule_timeout(1); /* don't waste all the CPU time */
|
|
}
|
|
if ((stat & QIC02_STAT_READY) == 0)
|
|
return TE_OK;
|
|
|
|
/* If we reach this point, we probably need to wait much longer, or
|
|
* an exception occurred. Either case is not very time-critical.
|
|
* Check the status port only a few times every second.
|
|
* A interval of less than 0.10 sec will not be noticed by the user,
|
|
* more than 0.40 sec may give noticeable delays.
|
|
*/
|
|
spin_t += timeout;
|
|
TPQDEB({printk("wait_for_ready: additional timeout: %d\n", spin_t);})
|
|
|
|
/* not ready and no exception && timeout not expired yet */
|
|
while (((stat = inb_p(QIC02_STAT_PORT) & QIC02_STAT_MASK) == QIC02_STAT_MASK) && time_before(jiffies, spin_t)) {
|
|
/* be `nice` to other processes on long operations... */
|
|
/* nap 0.30 sec between checks, */
|
|
/* but could be woken up earlier by signals... */
|
|
msleep_interruptible(300);
|
|
}
|
|
|
|
/* don't use jiffies for this test because it may have changed by now */
|
|
if ((stat & QIC02_STAT_MASK) == QIC02_STAT_MASK) {
|
|
tpqputs(TPQD_ALWAYS, "wait_for_ready() timed out");
|
|
return TE_TIM;
|
|
}
|
|
|
|
if ((stat & QIC02_STAT_EXCEPTION) == 0) {
|
|
tpqputs(TPQD_ALWAYS, "exception detected after waiting_for_ready");
|
|
return TE_EX;
|
|
} else {
|
|
return TE_OK;
|
|
}
|
|
} /* wait_for_ready */
|
|
|
|
|
|
|
|
/* Send some data to the drive */
|
|
static int send_qic02_data(char sb[], unsigned size, int ignore_ex)
|
|
{
|
|
int i, stat;
|
|
|
|
for (i = 0; i < size; i++) {
|
|
stat = wait_for_ready(TIM_S);
|
|
if (stat != TE_OK)
|
|
return stat;
|
|
|
|
stat = notify_cmd(sb[i], ignore_ex);
|
|
if (stat != TE_OK)
|
|
return stat;
|
|
}
|
|
return TE_OK;
|
|
|
|
} /* send_qic02_data */
|
|
|
|
|
|
/* Send a QIC-02 command (`cmd') to the tape drive, with
|
|
* a time-out (`timeout').
|
|
* This one is also used by tp_sense(), so we must have
|
|
* a flag to disable exception checking (`ignore_ex').
|
|
*
|
|
* On entry, the controller is supposed to be READY.
|
|
*/
|
|
static int send_qic02_cmd(int cmd, time_t timeout, int ignore_ex)
|
|
{
|
|
int stat;
|
|
|
|
stat = inb_p(QIC02_STAT_PORT);
|
|
if ((stat & QIC02_STAT_EXCEPTION) == 0) { /* if exception */
|
|
tpqputs(TPQD_ALWAYS, "send_qic02_cmd: Exception!");
|
|
return TE_EX;
|
|
}
|
|
if (stat & QIC02_STAT_READY) { /* if not ready */
|
|
tpqputs(TPQD_ALWAYS, "send_qic02_cmd: not Ready!");
|
|
return TE_ERR;
|
|
}
|
|
|
|
/* assert(ready & !exception) */
|
|
|
|
/* Remember current command for later re-use with dma transfers.
|
|
* (For reading/writing multiple blocks.)
|
|
*/
|
|
status_cmd_pending = cmd;
|
|
|
|
stat = notify_cmd(cmd, ignore_ex); /* tell drive new command was loaded, */
|
|
/* inherit exception check. */
|
|
if (TP_HAVE_SEEK && (cmd == AR_QCMDV_SEEK_BLK)) {
|
|
/* This one needs to send 3 more bytes, MSB first */
|
|
stat = send_qic02_data(seek_addr_buf, sizeof(seek_addr_buf), ignore_ex);
|
|
}
|
|
|
|
if (stat != TE_OK) {
|
|
tpqputs(TPQD_ALWAYS, "send_qic02_cmd failed");
|
|
}
|
|
return stat;
|
|
} /* send_qic02_cmd */
|
|
|
|
|
|
|
|
/* Get drive status. Assume drive is ready or has exception set.
|
|
* (or will be in <1000 usec.)
|
|
* Extra parameters added because of 'Read Extended Status 3' command.
|
|
*/
|
|
static int rdstatus(char *stp, unsigned size, char qcmd)
|
|
{
|
|
int s, n;
|
|
char *q = stp;
|
|
|
|
/* Try to busy-wait a few (700) usec, after that de-schedule.
|
|
*
|
|
* The problem is, if we don't de-schedule, performance will
|
|
* drop to zero when the drive is not responding and if we
|
|
* de-schedule immediately, we waste a lot of time because a
|
|
* task switch is much longer than we usually have to wait here.
|
|
*/
|
|
n = 700;
|
|
while ((n > 0) && ((inb_p(QIC02_STAT_PORT) & QIC02_STAT_MASK) == QIC02_STAT_MASK))
|
|
{
|
|
udelay(1);
|
|
n--; /* wait for ready or exception or timeout */
|
|
}
|
|
if (n == 0) {
|
|
/* n (above) should be chosen such that on your machine
|
|
* you rarely ever see the message below, and it should
|
|
* be small enough to give reasonable response time.]
|
|
*/
|
|
/* FIXME */
|
|
tpqputs(TPQD_ALWAYS, "waiting looong in rdstatus() -- drive dead?");
|
|
while ((inb_p(QIC02_STAT_PORT) & QIC02_STAT_MASK) == QIC02_STAT_MASK)
|
|
{
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule_timeout(1);
|
|
}
|
|
tpqputs(TPQD_ALWAYS, "finished waiting in rdstatus()");
|
|
}
|
|
|
|
(void) notify_cmd(qcmd, 1); /* send read status command */
|
|
/* ignore return code -- should always be ok, STAT may contain
|
|
* exception flag from previous exception which we are trying to clear.
|
|
*/
|
|
|
|
if (TP_DIAGS(current_type))
|
|
printk(TPQIC02_NAME ": reading status bytes: ");
|
|
|
|
for (q = stp; q < stp + size; q++) {
|
|
do
|
|
s = inb_p(QIC02_STAT_PORT);
|
|
while ((s & QIC02_STAT_MASK) == QIC02_STAT_MASK); /* wait for ready or exception */
|
|
|
|
if ((s & QIC02_STAT_EXCEPTION) == 0) { /* if exception */
|
|
tpqputs(TPQD_ALWAYS, "rdstatus: exception error");
|
|
ioctl_status.mt_erreg = 0; /* dunno... */
|
|
return TE_NS; /* error, shouldn't happen... */
|
|
}
|
|
|
|
*q = inb_p(QIC02_DATA_PORT); /* read status byte */
|
|
|
|
if (TP_DIAGS(current_type))
|
|
printk("[%1zd]=0x%x ", q - stp, (unsigned) (*q) & 0xff);
|
|
|
|
outb_p(ctlbits | QIC02_CTL_REQUEST, QIC02_CTL_PORT); /* set request */
|
|
|
|
while ((inb_p(QIC02_STAT_PORT) & QIC02_STAT_READY) == 0)
|
|
cpu_relax(); /* wait for not ready */
|
|
|
|
udelay(22); /* delay >20 usec */
|
|
|
|
outb_p(ctlbits & ~QIC02_CTL_REQUEST, QIC02_CTL_PORT); /* un-set request */
|
|
|
|
}
|
|
|
|
/* Specs say we should wait for READY here.
|
|
* My drive doesn't seem to need it here yet, but others do?
|
|
*/
|
|
while (inb_p(QIC02_STAT_PORT) & QIC02_STAT_READY)
|
|
cpu_relax();
|
|
/* wait for ready */
|
|
|
|
if (TP_DIAGS(current_type))
|
|
printk("\n");
|
|
|
|
return TE_OK;
|
|
} /* rdstatus */
|
|
|
|
|
|
|
|
/* Get standard status (6 bytes).
|
|
* The `.dec' and `.urc' fields are in MSB-first byte-order,
|
|
* so they have to be swapped first.
|
|
*/
|
|
static int get_status(volatile struct tpstatus *stp)
|
|
{
|
|
int stat = rdstatus((char *) stp, TPSTATSIZE, QCMD_RD_STAT);
|
|
stp->dec = be16_to_cpu(stp->dec);
|
|
stp->urc = be16_to_cpu(stp->urc);
|
|
return stat;
|
|
} /* get_status */
|
|
|
|
|
|
#if 0
|
|
/* This fails for my Wangtek drive */
|
|
/* get "Extended Status Register 3" (64 bytes)
|
|
*
|
|
* If the meaning of the returned bytes were known, the MT_TYPE
|
|
* identifier could be used to decode them, since they are
|
|
* "vendor unique". :-(
|
|
*/
|
|
static int get_ext_status3(void)
|
|
{
|
|
char vus[64]; /* vendor unique status */
|
|
int stat, i;
|
|
|
|
tpqputs(TPQD_ALWAYS, "Attempting to read Extended Status 3...");
|
|
stat = rdstatus(vus, sizeof(vus), QCMD_RD_STAT_X3);
|
|
if (stat != TE_OK)
|
|
return stat;
|
|
|
|
tpqputs(TPQD_ALWAYS, "Returned status bytes:");
|
|
for (i = 0; i < sizeof(vus); i++) {
|
|
if (i % 8 == 0)
|
|
printk("\n" TPQIC02_NAME ": %2d:");
|
|
printk(" %2x", vus[i] & 0xff);
|
|
}
|
|
printk("\n");
|
|
|
|
return TE_OK;
|
|
} /* get_ext_status3 */
|
|
#endif
|
|
|
|
|
|
/* Read drive status and set generic status too.
|
|
* NOTE: Once we do a tp_sense(), read/write transfers are killed.
|
|
*/
|
|
static int tp_sense(int ignore)
|
|
{
|
|
unsigned err = 0, exnr = 0, gs = 0;
|
|
static void finish_rw(int cmd);
|
|
|
|
if (TPQDBG(SENSE_TEXT))
|
|
printk(TPQIC02_NAME ": tp_sense(ignore=0x%x) enter\n", ignore);
|
|
|
|
/* sense() is not allowed during a read or write cycle */
|
|
if (doing_write == YES)
|
|
tpqputs(TPQD_ALWAYS, "Warning: File Mark inserted because of sense() request");
|
|
/* The extra test is to avoid calling finish_rw during booting */
|
|
if ((doing_read != NO) || (doing_write != NO))
|
|
finish_rw(QCMD_RD_STAT);
|
|
|
|
if (get_status(&tperror) != TE_OK) {
|
|
tpqputs(TPQD_ALWAYS, "tp_sense: could not read tape drive status");
|
|
return TE_ERR;
|
|
}
|
|
|
|
err = tperror.exs; /* get exception status bits */
|
|
if (err & (TP_ST0 | TP_ST1))
|
|
printk(TPQIC02_NAME ": tp_sense: status: %x, error count: %d, underruns: %d\n",
|
|
tperror.exs, tperror.dec, tperror.urc);
|
|
else if ((tperror.dec != 0) || (tperror.urc != 0) || TPQDBG(SENSE_CNTS))
|
|
printk(TPQIC02_NAME ": tp_sense: no hard errors, soft error count: %d, underruns: %d\n", tperror.dec, tperror.urc);
|
|
|
|
/* Set generic status. HP-UX defines these, but some extra would
|
|
* be useful. Problem is to remain compatible. [Do we want to be
|
|
* compatible??]
|
|
*/
|
|
if (err & TP_ST0) {
|
|
if (err & TP_CNI) /* no cartridge */
|
|
gs |= GMT_DR_OPEN(-1);
|
|
if (status_dead == NO)
|
|
gs |= GMT_ONLINE(-1); /* always online */
|
|
if (err & TP_USL) /* not online */
|
|
gs &= ~GMT_ONLINE(-1);
|
|
if (err & TP_WRP)
|
|
gs |= GMT_WR_PROT(-1);
|
|
if (err & TP_EOM) { /* end of media */
|
|
gs |= GMT_EOT(-1); /* not sure this is correct for writes */
|
|
status_eom_detected = YES;
|
|
/* I don't know whether drive always reports EOF at or before EOM. */
|
|
status_eof_detected = YES;
|
|
}
|
|
/** if (err & TP_UDA) "Unrecoverable data error" **/
|
|
/** if (err & TP_BNL) "Bad block not located" **/
|
|
if (err & TP_FIL) {
|
|
gs |= GMT_EOF(-1);
|
|
status_eof_detected = YES;
|
|
}
|
|
}
|
|
if (err & TP_ST1) {
|
|
/** if (err & TP_ILL) "Illegal command" **/
|
|
/** if (err & TP_NDT) "No data detected" **/
|
|
/** if (err & TP_MBD) "Marginal block detected" **/
|
|
if (err & TP_BOM)
|
|
gs |= GMT_BOT(-1); /* beginning of tape */
|
|
}
|
|
ioctl_status.mt_gstat = gs;
|
|
ioctl_status.mt_dsreg = tperror.exs; /* "drive status" */
|
|
ioctl_status.mt_erreg = tperror.dec; /* "sense key error" */
|
|
|
|
if (err & (TP_ST0 | TP_ST1)) {
|
|
/* My Wangtek occasionally reports `status' 1212 which should be ignored. */
|
|
exnr = decode_qic_exception_nr(err);
|
|
handle_qic_exception(exnr, err); /* update driver state wrt drive status */
|
|
report_qic_exception(exnr);
|
|
}
|
|
err &= ~ignore; /* mask unwanted errors -- not the correct way, use exception nrs?? */
|
|
if (((err & TP_ST0) && (err & REPORT_ERR0)) ||
|
|
((err & TP_ST1) && (err & REPORT_ERR1)))
|
|
return TE_ERR;
|
|
return TE_OK;
|
|
} /* tp_sense */
|
|
|
|
|
|
|
|
/* Wait for a wind or rewind operation to finish or
|
|
* to time-out. (May take very long).
|
|
*/
|
|
static int wait_for_rewind(time_t timeout)
|
|
{
|
|
int stat;
|
|
|
|
stat = inb(QIC02_STAT_PORT) & QIC02_STAT_MASK;
|
|
if (TPQDBG(REWIND))
|
|
printk(TPQIC02_NAME ": Waiting for (re-)wind to finish: stat=0x%x\n", stat);
|
|
|
|
stat = wait_for_ready(timeout);
|
|
|
|
if (stat != TE_OK) {
|
|
tpqputs(TPQD_ALWAYS, "(re-) winding failed\n");
|
|
}
|
|
return stat;
|
|
} /* wait_for_rewind */
|
|
|
|
|
|
|
|
/* Perform a full QIC02 command, and wait for completion,
|
|
* check status when done. Complain about exceptions.
|
|
*
|
|
* This function should return an OS error code when
|
|
* something goes wrong, 0 otherwise.
|
|
*/
|
|
static int ll_do_qic_cmd(int cmd, time_t timeout)
|
|
{
|
|
int stat;
|
|
|
|
if (status_dead == YES) {
|
|
tpqputs(TPQD_ALWAYS, "Drive is dead. Do a `mt reset`.");
|
|
return -ENXIO; /* User should do an MTRESET. */
|
|
}
|
|
|
|
stat = wait_for_ready(timeout); /* wait for ready or exception */
|
|
if (stat == TE_EX) {
|
|
if (tp_sense(TP_WRP | TP_BOM | TP_EOM | TP_FIL) != TE_OK)
|
|
return -EIO;
|
|
/* else nothing to worry about, I hope */
|
|
stat = TE_OK;
|
|
}
|
|
if (stat != TE_OK) {
|
|
printk(TPQIC02_NAME ": ll_do_qic_cmd(%x, %ld) failed\n", cmd, (long) timeout);
|
|
return -EIO;
|
|
}
|
|
#ifdef OBSOLETE
|
|
/* wait for ready since it may not be active immediately after reading status */
|
|
while ((inb_p(QIC02_STAT_PORT) & QIC02_STAT_READY) != 0)
|
|
cpu_relax();
|
|
#endif
|
|
|
|
stat = send_qic02_cmd(cmd, timeout, 0); /* (checks for exceptions) */
|
|
|
|
if (cmd == QCMD_RD_FM) {
|
|
status_eof_detected = NO;
|
|
ioctl_status.mt_fileno++;
|
|
/* Should update block count as well, but can't.
|
|
* Can do a `read address' for some drives, when MTNOP is done.
|
|
*/
|
|
} else if (cmd == QCMD_WRT_FM) {
|
|
status_eof_detected = NO;
|
|
ioctl_status.mt_fileno++;
|
|
} else if ((cmd == QCMD_REWIND) || (cmd == QCMD_ERASE)
|
|
|| (cmd == QCMD_RETEN)) {
|
|
status_eof_detected = NO;
|
|
status_eom_detected = NO;
|
|
status_eot_detected = NO;
|
|
need_rewind = NO;
|
|
ioctl_status.mt_fileno = ioctl_status.mt_blkno = 0;
|
|
extra_blocks_left = BLOCKS_BEYOND_EW;
|
|
return_write_eof = NO;
|
|
return_read_eof = NO;
|
|
reported_read_eof = NO;
|
|
reported_write_eof = NO;
|
|
}
|
|
/* sense() will set eof/eom as required */
|
|
if (stat == TE_EX) {
|
|
if (tp_sense(TP_WRP | TP_BOM | TP_EOM | TP_FIL) != TE_OK) {
|
|
printk(TPQIC02_NAME ": Exception persist in ll_do_qic_cmd[1](%x, %ld)", cmd, (long) timeout);
|
|
status_dead = YES;
|
|
return -ENXIO;
|
|
/* if rdstatus fails too, we're in trouble */
|
|
}
|
|
} else if (stat != TE_OK) {
|
|
printk(TPQIC02_NAME ": ll_do_qic_cmd: send_qic02_cmd failed, stat = 0x%x\n", stat);
|
|
return -EIO; /*** -EIO is probably not always appropriate */
|
|
}
|
|
|
|
if (timeout == TIM_R)
|
|
stat = wait_for_rewind(timeout);
|
|
else
|
|
stat = wait_for_ready(timeout);
|
|
|
|
if (stat == TE_EX) {
|
|
if (tp_sense((cmd == QCMD_SEEK_EOD ? /*****************************/
|
|
TP_EOR | TP_NDT | TP_UDA | TP_BNL | TP_WRP |
|
|
TP_BOM | TP_EOM | TP_FIL : TP_WRP | TP_BOM |
|
|
TP_EOM | TP_FIL)) != TE_OK) {
|
|
printk(TPQIC02_NAME ": Exception persist in ll_do_qic_cmd[2](%x, %ld)\n", cmd, (long) timeout);
|
|
if (cmd != QCMD_RD_FM)
|
|
status_dead = YES;
|
|
return -ENXIO;
|
|
/* if rdstatus fails too, we're in trouble */
|
|
}
|
|
} else if (stat != TE_OK) {
|
|
printk(TPQIC02_NAME ": ll_do_qic_cmd %x: wait failed, stat == 0x%x\n", cmd, stat);
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
} /* ll_do_qic_cmd */
|
|
|
|
|
|
/*
|
|
* Problem: What to do when the user cancels a read/write operation
|
|
* in-progress?
|
|
*
|
|
* "Deactivating ONLINE during a READ also causes the"
|
|
* "tape to be rewound to BOT." Ditto for WRITEs, except
|
|
* a FM is written first. "The host may alternatively terminate
|
|
* the READ/WRITE command by issuing a RFM/WFM command."
|
|
*
|
|
* For READs:
|
|
* Neither option will leave the tape positioned where it was.
|
|
* Another (better?) solution is to terminate the READ by two
|
|
* subsequent sense() operations, the first to stop the current
|
|
* READ cycle, the second to clear the `Illegal command' exception,
|
|
* because the QIC-02 specs didn't anticipate this. This is
|
|
* delayed until actually needed, so a tar listing can be aborted
|
|
* by the user and continued later.
|
|
* If anybody has a better solution, let me know! [Also, let me
|
|
* know if your drive (mine is a Wangtek5150EQ) does not accept
|
|
* this sequence for canceling the read-cycle.]
|
|
*
|
|
* For WRITEs it's simple: Just do a WRITE_FM, leaving the tape
|
|
* positioned after the FM.
|
|
*/
|
|
|
|
static void terminate_read(int cmd)
|
|
{
|
|
if (doing_read != YES)
|
|
return;
|
|
|
|
doing_read = NO;
|
|
|
|
if (cmd == QCMD_RD_FM)
|
|
return;
|
|
|
|
/* if the command is a RFM, there is no need to do this
|
|
* because a RFM will legally terminate the read-cycle.
|
|
*/
|
|
tpqputs(TPQD_ALWAYS, "terminating pending read-cycle");
|
|
|
|
/* I'm not too sure about this part -- hhb */
|
|
if (QIC02_TAPE_IFC == MOUNTAIN) {
|
|
/* Mountain reference says can terminate by de-asserting online */
|
|
ctlbits &= ~MTN_QIC02_CTL_ONLINE;
|
|
}
|
|
|
|
if (tp_sense(TP_FIL | TP_EOM | TP_WRP) != TE_OK) {
|
|
tpqputs(TPQD_ALWAYS, "finish_rw[read1]: ignore the 2 lines above");
|
|
if (is_exception()) {
|
|
if (tp_sense(TP_ILL | TP_FIL | TP_EOM | TP_WRP) != TE_OK)
|
|
tpqputs(TPQD_ALWAYS,"finish_rw[read2]: read cycle error");
|
|
}
|
|
}
|
|
} /* terminate_read */
|
|
|
|
|
|
static void terminate_write(int cmd)
|
|
{
|
|
int stat;
|
|
|
|
if (doing_write != YES)
|
|
return;
|
|
|
|
doing_write = NO;
|
|
/* Finish writing by appending a FileMark at the end. */
|
|
if (cmd != QCMD_WRT_FM) {
|
|
/* finish off write cycle */
|
|
stat = ll_do_qic_cmd(QCMD_WRT_FM, TIM_M);
|
|
if (stat != TE_OK)
|
|
tpqputs(TPQD_ALWAYS, "Couldn't finish write cycle properly");
|
|
(void) tp_sense(0);
|
|
}
|
|
/* If there is an EOF token waiting to be returned to
|
|
* the (writing) application, discard it now.
|
|
* We could be at EOT, so don't reset return_write_eof.
|
|
*/
|
|
reported_write_eof = YES;
|
|
} /* terminate_write */
|
|
|
|
|
|
/* terminate read or write cycle because of command `cmd' */
|
|
static void finish_rw(int cmd)
|
|
{
|
|
if (wait_for_ready(TIM_S) != TE_OK) {
|
|
tpqputs(TPQD_ALWAYS, "error: drive not ready in finish_rw() !");
|
|
return;
|
|
}
|
|
terminate_read(cmd);
|
|
terminate_write(cmd);
|
|
} /* finish_rw */
|
|
|
|
|
|
/* Perform a QIC command through ll_do_qic_cmd().
|
|
* If necessary, rewind the tape first.
|
|
* Return an OS error code if something goes wrong, 0 if all is well.
|
|
*/
|
|
static int do_qic_cmd(int cmd, time_t timeout)
|
|
{
|
|
int stat;
|
|
|
|
|
|
finish_rw(cmd);
|
|
|
|
if (need_rewind) {
|
|
tpqputs(TPQD_REWIND, "Rewinding tape...");
|
|
stat = ll_do_qic_cmd(QCMD_REWIND, TIM_R);
|
|
if (stat != 0) {
|
|
printk(TPQIC02_NAME ": rewind failed in do_qic_cmd(). stat=0x%2x", stat);
|
|
return stat;
|
|
}
|
|
need_rewind = NO;
|
|
if (cmd == QCMD_REWIND) /* don't wind beyond BOT ;-) */
|
|
return 0;
|
|
}
|
|
|
|
return ll_do_qic_cmd(cmd, timeout);
|
|
} /* do_qic_cmd */
|
|
|
|
|
|
/* Not all ioctls are supported for all drives. Some rely on
|
|
* optional QIC-02 commands. Check tpqic02.h for configuration.
|
|
* Some of these commands may require ONLINE to be active.
|
|
*/
|
|
static int do_ioctl_cmd(int cmd)
|
|
{
|
|
int stat;
|
|
|
|
/* It is not permitted to read or wind the tape after bytes have
|
|
* been written. It is not permitted to write the tape while in
|
|
* read mode.
|
|
* We try to be kind and allow reading again after writing a FM...
|
|
*/
|
|
|
|
switch (cmd) {
|
|
case MTRESET:
|
|
/* reset verbose */
|
|
return (tape_reset(1) == TE_OK) ? 0 : -EIO;
|
|
|
|
case MTFSF:
|
|
tpqputs(TPQD_IOCTLS, "MTFSF forward searching filemark");
|
|
if ((mode_access == WRITE) && status_bytes_wr)
|
|
return -EACCES;
|
|
return do_qic_cmd(QCMD_RD_FM, TIM_F);
|
|
|
|
case MTBSF:
|
|
if (TP_HAVE_BSF) {
|
|
tpqputs(TPQD_IOCTLS, "MTBSF backward searching filemark -- optional command");
|
|
if ((mode_access == WRITE) && status_bytes_wr)
|
|
return -EACCES;
|
|
stat = do_qic_cmd(QCMD_RD_FM_BCK, TIM_F);
|
|
} else {
|
|
stat = -ENXIO;
|
|
}
|
|
status_eom_detected = status_eof_detected = NO;
|
|
return stat;
|
|
|
|
case MTFSR:
|
|
if (TP_HAVE_FSR) { /* This is an optional QIC-02 command */
|
|
tpqputs(TPQD_IOCTLS, "MTFSR forward space record");
|
|
if ((mode_access == WRITE) && status_bytes_wr)
|
|
return -EACCES;
|
|
stat = do_qic_cmd(QCMD_SPACE_FWD, TIM_F);
|
|
} else {
|
|
/**** fake it by doing a read data block command? ******/
|
|
tpqputs(TPQD_IOCTLS, "MTFSR not supported");
|
|
stat = -ENXIO;
|
|
}
|
|
return stat;
|
|
|
|
case MTBSR:
|
|
if (TP_HAVE_BSR) { /* This is an optional QIC-02 command */
|
|
/* we need this for appending files with GNU tar!! */
|
|
tpqputs(TPQD_IOCTLS, "MTFSR backward space record");
|
|
if ((mode_access == WRITE) && status_bytes_wr)
|
|
return -EACCES;
|
|
stat = do_qic_cmd(QCMD_SPACE_BCK, TIM_F);
|
|
} else {
|
|
tpqputs(TPQD_IOCTLS, "MTBSR not supported");
|
|
stat = -ENXIO;
|
|
}
|
|
status_eom_detected = status_eof_detected = NO;
|
|
return stat;
|
|
|
|
case MTWEOF:
|
|
tpqputs(TPQD_IOCTLS, "MTWEOF write eof mark");
|
|
/* Plain GNU mt(1) 2.2 uses read-only mode for writing FM. :-( */
|
|
if (mode_access == READ)
|
|
return -EACCES;
|
|
|
|
/* allow tape movement after writing FM */
|
|
status_bytes_rd = status_bytes_wr; /* Kludge-O-Matic */
|
|
status_bytes_wr = NO;
|
|
return do_qic_cmd(QCMD_WRT_FM, TIM_M);
|
|
/* not sure what to do with status_bytes when WFM should fail */
|
|
|
|
case MTREW:
|
|
tpqputs(TPQD_IOCTLS, "MTREW rewinding tape");
|
|
if ((mode_access == WRITE) && status_bytes_wr)
|
|
return -EACCES;
|
|
status_eom_detected = status_eof_detected = NO;
|
|
return do_qic_cmd(QCMD_REWIND, TIM_R);
|
|
|
|
case MTOFFL:
|
|
tpqputs(TPQD_IOCTLS, "MTOFFL rewinding & going offline");
|
|
/* Doing a drive select will clear (unlock) the current drive.
|
|
* But that requires support for multiple drives and locking.
|
|
*/
|
|
if ((mode_access == WRITE) && status_bytes_wr)
|
|
return -EACCES;
|
|
status_eom_detected = status_eof_detected = NO;
|
|
/**** do rewind depending on minor bits??? ***/
|
|
stat = do_qic_cmd(QCMD_REWIND, TIM_R);
|
|
return stat;
|
|
|
|
case MTNOP:
|
|
tpqputs(TPQD_IOCTLS, "MTNOP setting status only");
|
|
/********** should do `read position' for drives that support it **********/
|
|
return (tp_sense(-1) == TE_OK) ? 0 : -EIO; /**** check return codes ****/
|
|
|
|
case MTRETEN:
|
|
tpqputs(TPQD_IOCTLS, "MTRETEN retension tape");
|
|
if ((mode_access == WRITE) && status_bytes_wr)
|
|
return -EACCES;
|
|
status_eom_detected = status_eof_detected = NO;
|
|
return do_qic_cmd(QCMD_RETEN, TIM_R);
|
|
|
|
case MTBSFM:
|
|
/* Think think is like MTBSF, except that
|
|
* we shouldn't skip the FM. Tricky.
|
|
* Maybe use RD_FM_BCK, then do a SPACE_FWD?
|
|
*/
|
|
tpqputs(TPQD_IOCTLS, "MTBSFM not supported");
|
|
if ((mode_access == WRITE) && status_bytes_wr)
|
|
return -EACCES;
|
|
return -ENXIO;
|
|
|
|
case MTFSFM:
|
|
/* I think this is like MTFSF, except that
|
|
* we shouldn't skip the FM. Tricky.
|
|
* Maybe use QCMD_RD_DATA until we get a TP_FIL exception?
|
|
* But then the FM will have been skipped...
|
|
* Maybe use RD_FM, then RD_FM_BCK, but not all
|
|
* drives will support that!
|
|
*/
|
|
tpqputs(TPQD_IOCTLS, "MTFSFM not supported");
|
|
if ((mode_access == WRITE) && status_bytes_wr)
|
|
return -EACCES;
|
|
return -ENXIO;
|
|
|
|
case MTEOM:
|
|
/* This should leave the tape ready for appending
|
|
* another file to the end, such that it would append
|
|
* after the last FM on tape.
|
|
*/
|
|
tpqputs(TPQD_IOCTLS, "MTEOM search for End Of recorded Media");
|
|
if ((mode_access == WRITE) && status_bytes_wr)
|
|
return -EACCES;
|
|
if (TP_HAVE_EOD) {
|
|
/* Use faster seeking when possible.
|
|
* This requires the absence of data beyond the EOM.
|
|
* It seems that my drive does not always perform the
|
|
* SEEK_EOD correctly, unless it is preceded by a
|
|
* rewind command.
|
|
*/
|
|
# if 0
|
|
status_eom_detected = status_eof_detected = NO;
|
|
# endif
|
|
stat = do_qic_cmd(QCMD_REWIND, TIM_R);
|
|
if (stat)
|
|
return stat;
|
|
stat = do_qic_cmd(QCMD_SEEK_EOD, TIM_F);
|
|
/* After a successful seek, TP_EOR should be returned */
|
|
} else {
|
|
/* else just seek until the drive returns exception "No Data" */
|
|
stat = 0;
|
|
while ((stat == 0) && (!status_eom_detected)) {
|
|
stat = do_qic_cmd(QCMD_RD_FM, TIM_F); /***** should use MTFSFM here???? ******/
|
|
}
|
|
if (tperror.exs & TP_NDT)
|
|
return 0;
|
|
}
|
|
return stat;
|
|
|
|
case MTERASE:
|
|
tpqputs(TPQD_IOCTLS, "MTERASE -- ERASE TAPE !");
|
|
if ((tperror.exs & TP_ST0) && (tperror.exs & TP_WRP)) {
|
|
tpqputs(TPQD_ALWAYS, "Cartridge is write-protected.");
|
|
return -EACCES;
|
|
} else {
|
|
time_t t = jiffies;
|
|
|
|
/* Plain GNU mt(1) 2.2 erases a tape in O_RDONLY. :-( */
|
|
if (mode_access == READ)
|
|
return -EACCES;
|
|
|
|
/* FIXME */
|
|
/* give user a few seconds to pull out tape */
|
|
while (jiffies - t < 4 * HZ)
|
|
schedule();
|
|
}
|
|
|
|
/* don't bother writing filemark first */
|
|
status_eom_detected = status_eof_detected = NO;
|
|
return do_qic_cmd(QCMD_ERASE, TIM_R);
|
|
|
|
case MTRAS1:
|
|
if (TP_HAVE_RAS1) {
|
|
tpqputs(TPQD_IOCTLS, "MTRAS1: non-destructive self test");
|
|
stat = do_qic_cmd(QCMD_SELF_TST1, TIM_R);
|
|
if (stat != 0) {
|
|
tpqputs(TPQD_ALWAYS, "RAS1 failed");
|
|
return stat;
|
|
}
|
|
return (tp_sense(0) == TE_OK) ? 0 : -EIO; /* get_ext_status3(); */
|
|
}
|
|
tpqputs(TPQD_IOCTLS, "RAS1 not supported");
|
|
return -ENXIO;
|
|
|
|
case MTRAS2:
|
|
if (TP_HAVE_RAS2) {
|
|
tpqputs(TPQD_IOCTLS, "MTRAS2: destructive self test");
|
|
stat = do_qic_cmd(QCMD_SELF_TST2, TIM_R);
|
|
if (stat != 0) {
|
|
tpqputs(TPQD_ALWAYS, "RAS2 failed");
|
|
return stat;
|
|
}
|
|
return (tp_sense(0) == TE_OK) ? 0 : -EIO; /* get_ext_status3(); */
|
|
}
|
|
tpqputs(TPQD_IOCTLS, "RAS2 not supported");
|
|
return -ENXIO;
|
|
|
|
case MTSEEK:
|
|
if (TP_HAVE_SEEK && (QIC02_TAPE_IFC == ARCHIVE)) {
|
|
tpqputs(TPQD_IOCTLS, "MTSEEK seeking block");
|
|
if ((mode_access == WRITE) && status_bytes_wr)
|
|
return -EACCES;
|
|
/* NOTE: address (24 bits) is in seek_addr_buf[] */
|
|
return do_qic_cmd(AR_QCMDV_SEEK_BLK, TIM_F);
|
|
} else
|
|
return -ENOTTY;
|
|
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
} /* do_ioctl_cmd */
|
|
|
|
|
|
/* dma_transfer(): This routine is called for every 512 bytes to be read
|
|
* from/written to the tape controller. Speed is important here!
|
|
* (There must be enough time left for the hd controller!)
|
|
* The dma lock protects the DMA controller
|
|
*
|
|
* This routine merely does the least possible to keep
|
|
* the transfers going:
|
|
* - set the DMA count register for the next 512 bytes
|
|
* - adjust the DMA address and page registers
|
|
* - adjust the timeout
|
|
* - tell the tape controller to start transferring
|
|
* We assume the dma address and mode are, and remain, valid.
|
|
*/
|
|
static inline void dma_transfer(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (QIC02_TAPE_IFC == WANGTEK) /* or EVEREX */
|
|
outb_p(WT_CTL_ONLINE, QIC02_CTL_PORT); /* back to normal */
|
|
else if (QIC02_TAPE_IFC == ARCHIVE)
|
|
outb_p(0, AR_RESET_DMA_PORT);
|
|
else /* QIC02_TAPE_IFC == MOUNTAIN */
|
|
outb_p(ctlbits, QIC02_CTL_PORT);
|
|
|
|
|
|
flags = claim_dma_lock();
|
|
clear_dma_ff(QIC02_TAPE_DMA);
|
|
set_dma_mode(QIC02_TAPE_DMA, dma_mode);
|
|
set_dma_addr(QIC02_TAPE_DMA, isa_virt_to_bus(buffaddr) + dma_bytes_done);
|
|
set_dma_count(QIC02_TAPE_DMA, TAPE_BLKSIZE);
|
|
|
|
/* start tape DMA controller */
|
|
if (QIC02_TAPE_IFC == WANGTEK) /* or EVEREX */
|
|
outb_p(WT_CTL_DMA | WT_CTL_ONLINE, QIC02_CTL_PORT); /* trigger DMA transfer */
|
|
|
|
else if (QIC02_TAPE_IFC == ARCHIVE) {
|
|
outb_p(AR_CTL_IEN | AR_CTL_DNIEN, QIC02_CTL_PORT); /* enable interrupts again */
|
|
outb_p(0, AR_START_DMA_PORT); /* start DMA transfer */
|
|
/* In dma_end() AR_RESET_DMA_PORT is written too. */
|
|
|
|
} else { /* QIC02_TAPE_IFC == MOUNTAIN */
|
|
|
|
inb(MTN_R_DESELECT_DMA_PORT);
|
|
outb_p(ctlbits | (MTN_CTL_EXC_IEN | MTN_CTL_DNIEN),
|
|
QIC02_CTL_PORT);
|
|
outb_p(0, MTN_W_SELECT_DMA_PORT); /* start DMA transfer */
|
|
if (dma_mode == DMA_MODE_WRITE)
|
|
outb_p(0, MTN_W_DMA_WRITE_PORT); /* start DMA transfer */
|
|
}
|
|
|
|
/* start computer DMA controller */
|
|
enable_dma(QIC02_TAPE_DMA);
|
|
|
|
release_dma_lock(flags);
|
|
|
|
/* block transfer should start now, jumping to the
|
|
* interrupt routine when done or an exception was detected.
|
|
*/
|
|
} /* dma_transfer */
|
|
|
|
|
|
/* start_dma() sets a DMA transfer up between the tape controller and
|
|
* the kernel qic02_tape_buf buffer.
|
|
* Normally bytes_todo==dma_bytes_done at the end of a DMA transfer. If not,
|
|
* a filemark was read, or an attempt to write beyond the End Of Tape
|
|
* was made. [Or some other bad thing happened.]
|
|
* Must do a sense() before returning error.
|
|
*/
|
|
static int start_dma(short mode, unsigned long bytes_todo)
|
|
/* assume 'bytes_todo'>0 */
|
|
{
|
|
int stat;
|
|
|
|
tpqputs(TPQD_DEBUG, "start_dma() enter");
|
|
TPQDEB( {printk(TPQIC02_NAME ": doing_read==%d, doing_write==%d\n",
|
|
doing_read, doing_write);})
|
|
|
|
dma_bytes_done = 0;
|
|
dma_bytes_todo = bytes_todo;
|
|
status_error = NO;
|
|
/* dma_mode!=0 indicates that the dma controller is in use */
|
|
dma_mode = (mode == WRITE) ? DMA_MODE_WRITE : DMA_MODE_READ;
|
|
|
|
/* Only give READ/WRITE DATA command to tape drive if we haven't
|
|
* done that already. Otherwise the drive will rewind to the beginning
|
|
* of the current file on tape. Any QIC command given other than
|
|
* R/W FM will break the read/write transfer cycle.
|
|
* do_qic_cmd() will terminate doing_{read,write}
|
|
*/
|
|
if ((doing_read == NO) && (doing_write == NO)) {
|
|
/* First, we have to clear the status -- maybe remove TP_FIL???
|
|
*/
|
|
|
|
#if 0
|
|
/* Next dummy get status is to make sure CNI is valid,
|
|
since we're only just starting a read/write it doesn't
|
|
matter some exceptions are cleared by reading the status;
|
|
we're only interested in CNI and WRP. -Eddy */
|
|
get_status(&tperror);
|
|
#else
|
|
/* TP_CNI should now be handled in open(). -Hennus */
|
|
#endif
|
|
|
|
stat = tp_sense(((mode == WRITE) ? 0 : TP_WRP) | TP_BOM | TP_FIL);
|
|
if (stat != TE_OK)
|
|
return stat;
|
|
|
|
#ifdef OBSOLETE
|
|
/************* not needed iff rd_status() would wait for ready!!!!!! **********/
|
|
if (wait_for_ready(TIM_S) != TE_OK) { /*** not sure this is needed ***/
|
|
tpqputs(TPQD_ALWAYS, "wait_for_ready failed in start_dma");
|
|
return -EIO;
|
|
}
|
|
#endif
|
|
|
|
if (QIC02_TAPE_IFC == MOUNTAIN) {
|
|
/* Set control bits to select ONLINE during command */
|
|
ctlbits |= MTN_QIC02_CTL_ONLINE;
|
|
}
|
|
|
|
/* Tell the controller the data direction */
|
|
|
|
/* r/w, timeout medium, check exceptions, sets status_cmd_pending. */
|
|
stat = send_qic02_cmd((mode == WRITE) ? QCMD_WRT_DATA : QCMD_RD_DATA, TIM_M, 0);
|
|
if (stat != TE_OK) {
|
|
printk(TPQIC02_NAME ": start_dma: init %s failed\n", (mode == WRITE) ? "write" : "read");
|
|
(void) tp_sense(0);
|
|
return stat;
|
|
}
|
|
|
|
/* Do this last, because sense() will clear the doing_{read,write}
|
|
* flags, causing trouble next time around.
|
|
*/
|
|
if (wait_for_ready(TIM_M) != TE_OK)
|
|
return -EIO;
|
|
switch (mode) {
|
|
case READ:
|
|
doing_read = YES;
|
|
break;
|
|
case WRITE:
|
|
doing_write = YES;
|
|
break;
|
|
default:
|
|
printk(TPQIC02_NAME ": requested unknown mode %d\n", mode);
|
|
panic(TPQIC02_NAME ": invalid mode in start_dma()");
|
|
}
|
|
|
|
} else if (is_exception()) {
|
|
/* This is for Archive drives, to handle reads with 0 bytes
|
|
* left for the last read request.
|
|
*
|
|
* ******** this also affects EOF/EOT handling! ************
|
|
*/
|
|
tpqputs(TPQD_ALWAYS, "detected exception in start_dma() while transfer in progress");
|
|
status_error = YES;
|
|
return TE_END;
|
|
}
|
|
|
|
|
|
status_expect_int = YES;
|
|
|
|
/* This assumes tape is already positioned, but these
|
|
* semi-'intelligent' drives are unpredictable...
|
|
*/
|
|
TIMERON(TIM_M * 2);
|
|
|
|
/* initiate first data block read from/write to the tape controller */
|
|
|
|
dma_transfer();
|
|
|
|
TPQPUTS("start_dma() end");
|
|
return TE_OK;
|
|
} /* start_dma */
|
|
|
|
|
|
/* This cleans up after the dma transfer has completed
|
|
* (or failed). If an exception occurred, a sense()
|
|
* must be done. If the exception was caused by a FM,
|
|
* sense() will set `status_eof_detected' and
|
|
* `status_eom_detected', as required.
|
|
*/
|
|
static void end_dma(unsigned long *bytes_done)
|
|
{
|
|
int stat = TE_OK;
|
|
unsigned long flags;
|
|
|
|
TIMEROFF;
|
|
|
|
TPQPUTS("end_dma() enter");
|
|
|
|
flags = claim_dma_lock();
|
|
|
|
disable_dma(QIC02_TAPE_DMA);
|
|
clear_dma_ff(QIC02_TAPE_DMA);
|
|
|
|
release_dma_lock(flags);
|
|
|
|
if (QIC02_TAPE_IFC == WANGTEK) /* or EVEREX */
|
|
outb_p(WT_CTL_ONLINE, QIC02_CTL_PORT); /* back to normal */
|
|
else if (QIC02_TAPE_IFC == ARCHIVE)
|
|
outb_p(0, AR_RESET_DMA_PORT);
|
|
else { /* QIC02_TAPE_IFC == MOUNTAIN */
|
|
/* Clear control bits, de-select ONLINE during tp_sense */
|
|
ctlbits &= ~MTN_QIC02_CTL_ONLINE;
|
|
}
|
|
|
|
stat = wait_for_ready(TIM_M);
|
|
if (status_error || (stat != TE_OK)) {
|
|
tpqputs(TPQD_DMAX, "DMA transfer exception");
|
|
stat = tp_sense((dma_mode == READ) ? TP_WRP : 0);
|
|
/* no return here -- got to clean up first! */
|
|
} else { /* if (QIC02_TAPE_IFC == MOUNTAIN) */
|
|
outb_p(ctlbits, QIC02_CTL_PORT);
|
|
}
|
|
|
|
if (QIC02_TAPE_IFC == MOUNTAIN)
|
|
inb(MTN_R_DESELECT_DMA_PORT);
|
|
|
|
/* take the tape controller offline */
|
|
|
|
/* finish off DMA stuff */
|
|
|
|
|
|
dma_mode = 0;
|
|
/* Note: The drive is left on-line, ready for the next
|
|
* data transfer.
|
|
* If the next command to the drive does not continue
|
|
* the pending cycle, it must do 2 sense()s first.
|
|
*/
|
|
|
|
*bytes_done = dma_bytes_done;
|
|
status_expect_int = NO;
|
|
ioctl_status.mt_blkno += (dma_bytes_done / TAPE_BLKSIZE);
|
|
|
|
TPQPUTS("end_dma() exit");
|
|
/*** could return stat here ***/
|
|
} /* end_dma */
|
|
|
|
/*********** Below are the (public) OS-interface procedures ***********/
|
|
|
|
|
|
/* qic02_tape_times_out() is called when a DMA transfer doesn't complete
|
|
* quickly enough. Usually this means there is something seriously wrong
|
|
* with the hardware/software, but it could just be that the controller
|
|
* has decided to do a long rewind, just when I didn't expect it.
|
|
* Just try again.
|
|
*/
|
|
static void qic02_tape_times_out(unsigned long dummy)
|
|
{
|
|
printk("time-out in %s driver\n", TPQIC02_NAME);
|
|
if ((status_cmd_pending > 0) || dma_mode) {
|
|
/* takes tooo long, shut it down */
|
|
status_dead = YES;
|
|
status_cmd_pending = 0;
|
|
status_timer_on = NO;
|
|
status_expect_int = NO;
|
|
status_error = YES;
|
|
if (dma_mode) {
|
|
dma_mode = 0; /* signal end to read/write routine */
|
|
wake_up(&qic02_tape_transfer);
|
|
}
|
|
}
|
|
} /* qic02_tape_times_out */
|
|
|
|
/*
|
|
* Interrupt handling:
|
|
*
|
|
* 1) Interrupt is generated iff at the end of
|
|
* a 512-DMA-block transfer.
|
|
* 2) EXCEPTION is not raised unless something
|
|
* is wrong or EOT/FM is detected.
|
|
* 3) FM EXCEPTION is set *after* the last byte has
|
|
* been transferred by DMA. By the time the interrupt
|
|
* is handled, the EXCEPTION may already be set.
|
|
*
|
|
* So,
|
|
* 1) On EXCEPTION, assume data has been transferred, so
|
|
* continue as usual, but set a flag to indicate the
|
|
* exception was detected.
|
|
* Do a sense status when the flag is found set.
|
|
* 2) Do not attempt to continue a transfer after an exception.
|
|
* [??? What about marginal blocks???????]
|
|
*/
|
|
|
|
|
|
/* qic02_tape_interrupt() is called when the tape controller completes
|
|
* a DMA transfer.
|
|
* We are not allowed to sleep here!
|
|
*
|
|
* Check if the transfer was successful, check if we need to transfer
|
|
* more. If the buffer contains enough data/is empty enough, signal the
|
|
* read/write() thread to copy to/from user space.
|
|
* When we are finished, set flags to indicate end, disable timer.
|
|
* NOTE: This *must* be fast!
|
|
*/
|
|
static irqreturn_t qic02_tape_interrupt(int irq, void *dev_id,
|
|
struct pt_regs *regs)
|
|
{
|
|
int stat, r, i;
|
|
unsigned long flags;
|
|
|
|
TIMEROFF;
|
|
|
|
if (status_expect_int) {
|
|
#ifdef WANT_EXTRA_FULL_DEBUGGING
|
|
if (TP_DIAGS(current_type))
|
|
printk("@");
|
|
#endif
|
|
stat = inb(QIC02_STAT_PORT); /* Knock, knock */
|
|
if (QIC02_TAPE_IFC == ARCHIVE) { /* "Who's there?" */
|
|
if (((stat & (AR_STAT_DMADONE)) == 0) &&
|
|
((stat & (QIC02_STAT_EXCEPTION)) != 0)) {
|
|
TIMERCONT;
|
|
return IRQ_NONE;/* "Linux with IRQ sharing" */
|
|
}
|
|
}
|
|
|
|
if ((stat & QIC02_STAT_EXCEPTION) == 0) { /* exception occurred */
|
|
/* Possible causes for an exception during a transfer:
|
|
* - during a write-cycle: end of tape (EW) hole detected.
|
|
* - during a read-cycle: filemark or EOD detected.
|
|
* - something went wrong
|
|
* So don't continue with the next block.
|
|
*/
|
|
tpqputs(TPQD_ALWAYS, "isr: exception on tape controller");
|
|
printk(" status %02x\n", stat);
|
|
status_error = TE_EX;
|
|
|
|
dma_bytes_done += TAPE_BLKSIZE;
|
|
|
|
dma_mode = 0; /* wake up rw() */
|
|
status_expect_int = NO;
|
|
wake_up(&qic02_tape_transfer);
|
|
return IRQ_HANDLED;
|
|
}
|
|
/* return if tape controller not ready, or
|
|
* if dma channel hasn't finished last byte yet.
|
|
*/
|
|
r = 0;
|
|
|
|
/* Skip next ready check for Archive controller because
|
|
* it may be busy reading ahead. Weird. --hhb
|
|
*/
|
|
if (QIC02_TAPE_IFC == WANGTEK) /* I think this is a drive-dependency, not IFC -- hhb */
|
|
if (stat & QIC02_STAT_READY) { /* not ready */
|
|
tpqputs(TPQD_ALWAYS, "isr: ? Tape controller not ready");
|
|
r = 1;
|
|
}
|
|
|
|
flags = claim_dma_lock();
|
|
|
|
if ((i = get_dma_residue(QIC02_TAPE_DMA)) != 0) {
|
|
printk(TPQIC02_NAME ": dma_residue == %x !!!\n", i);
|
|
r = 1; /* big trouble, but can't do much about it... */
|
|
}
|
|
|
|
release_dma_lock(flags);
|
|
|
|
if (r)
|
|
return IRQ_HANDLED;
|
|
|
|
/* finish DMA cycle */
|
|
|
|
/* no errors detected, continue */
|
|
dma_bytes_done += TAPE_BLKSIZE;
|
|
if (dma_bytes_done >= dma_bytes_todo) {
|
|
/* finished! Wakeup rw() */
|
|
dma_mode = 0;
|
|
status_expect_int = NO;
|
|
TPQPUTS("isr: dma_bytes_done");
|
|
wake_up(&qic02_tape_transfer);
|
|
} else {
|
|
/* start next transfer, account for track-switching time */
|
|
mod_timer(&tp_timer, jiffies + 6 * HZ);
|
|
dma_transfer();
|
|
}
|
|
} else {
|
|
printk(TPQIC02_NAME ": Unexpected interrupt, stat == %x\n", inb(QIC02_STAT_PORT));
|
|
}
|
|
return IRQ_HANDLED;
|
|
} /* qic02_tape_interrupt */
|
|
|
|
|
|
/* read/write routines:
|
|
* This code copies between a kernel buffer and a user buffer. The
|
|
* actual data transfer is done using DMA and interrupts. Time-outs
|
|
* are also used.
|
|
*
|
|
* When a filemark is read, we return '0 bytes read' and continue with the
|
|
* next file after that.
|
|
* When EOM is read, we return '0 bytes read' twice.
|
|
* When the EOT marker is detected on writes, '0 bytes read' should be
|
|
* returned twice. If user program does a MTNOP after that, 2 additional
|
|
* blocks may be written. ------- FIXME: Implement this correctly *************************************************
|
|
*
|
|
* Only read/writes in multiples of 512 bytes are accepted.
|
|
* When no bytes are available, we sleep() until they are. The controller will
|
|
* generate an interrupt, and we (should) get a wake_up() call.
|
|
*
|
|
* Simple buffering is used. User program should ensure that a large enough
|
|
* buffer is used. Usually the drive does some buffering as well (something
|
|
* like 4k or so).
|
|
*
|
|
* Scott S. Bertilson suggested to continue filling the user buffer, rather
|
|
* than waste time on a context switch, when the kernel buffer fills up.
|
|
*/
|
|
|
|
/*
|
|
* Problem: tar(1) doesn't always read the entire file. Sometimes the entire file
|
|
* has been read, but the EOF token is never returned to tar(1), simply because
|
|
* tar(1) knows it has already read all of the data it needs. So we must use
|
|
* open/release to reset the `reported_read_eof' flag. If we don't, the next read
|
|
* request would return the EOF flag for the previous file.
|
|
*/
|
|
|
|
static ssize_t qic02_tape_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
|
|
{
|
|
int type = iminor(filp->f_dentry->d_inode);
|
|
unsigned short flags = filp->f_flags;
|
|
unsigned long bytes_todo, bytes_done, total_bytes_done = 0;
|
|
int stat;
|
|
|
|
if (status_zombie == YES) {
|
|
tpqputs(TPQD_ALWAYS, "configs not set");
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (TP_DIAGS(current_type))
|
|
printk(TPQIC02_NAME ": request READ, minor=%x, buf=%p, count=%lx, pos=%Lx, flags=%x\n", type, buf,
|
|
(long) count, filp->f_pos, flags);
|
|
|
|
if (count % TAPE_BLKSIZE) { /* Only allow mod 512 bytes at a time. */
|
|
tpqputs(TPQD_BLKSZ, "Wrong block size");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Just assume everything is ok. Controller will scream if not. */
|
|
|
|
if (status_bytes_wr) { /* Once written, no more reads, 'till after WFM. */
|
|
return -EACCES;
|
|
}
|
|
|
|
/* This is rather ugly because it has to implement a finite state
|
|
* machine in order to handle the EOF situations properly.
|
|
*/
|
|
while ((signed) count >= 0) {
|
|
bytes_done = 0;
|
|
/* see how much fits in the kernel buffer */
|
|
bytes_todo = TPQBUF_SIZE;
|
|
if (bytes_todo > count) {
|
|
bytes_todo = count;
|
|
}
|
|
|
|
/* Must ensure that user program sees exactly one EOF token (==0) */
|
|
if (return_read_eof == YES) {
|
|
if (TPQDBG(DEBUG)) {
|
|
printk("read: return_read_eof==%d, reported_read_eof==%d, total_bytes_done==%lu\n", return_read_eof, reported_read_eof, total_bytes_done);
|
|
}
|
|
|
|
if (reported_read_eof == NO) {
|
|
/* have not yet returned EOF to user program */
|
|
if (total_bytes_done > 0) {
|
|
return total_bytes_done; /* next time return EOF */
|
|
} else {
|
|
reported_read_eof = YES; /* move on next time */
|
|
return 0; /* return EOF */
|
|
}
|
|
} else {
|
|
/* Application program has already received EOF
|
|
* (above), now continue with next file on tape,
|
|
* if possible.
|
|
* When the FM is reached, EXCEPTION is set,
|
|
* causing a sense(). Subsequent read/writes will
|
|
* continue after the FM.
|
|
*/
|
|
/*********** ?????????? this should check for (EOD|NDT), not EOM, 'cause we can read past EW: ************/
|
|
if (status_eom_detected) {
|
|
/* If EOM, nothing left to read, so keep returning EOFs.
|
|
*** should probably set some flag to avoid clearing
|
|
*** status_eom_detected through ioctls or something
|
|
*/
|
|
return 0;
|
|
} else {
|
|
/* just eof, there may be more files ahead... */
|
|
return_read_eof = NO;
|
|
reported_read_eof = NO;
|
|
status_eof_detected = NO; /* reset this too */
|
|
/*fall through */
|
|
}
|
|
}
|
|
}
|
|
|
|
if (bytes_todo == 0) {
|
|
return total_bytes_done;
|
|
}
|
|
|
|
if (bytes_todo > 0) {
|
|
/* start reading data */
|
|
if (is_exception()) {
|
|
tpqputs(TPQD_DMAX, "is_exception() before start_dma()!");
|
|
}
|
|
|
|
/******************************************************************
|
|
***** if start_dma() fails because the head is positioned 0 bytes
|
|
***** before the FM, (causing EXCEPTION to be set) return_read_eof should
|
|
***** be set to YES, and we should return total_bytes_done, rather than -ENXIO.
|
|
***** The app should recognize this as an EOF condition.
|
|
***************************************************************************/
|
|
stat = start_dma(READ, bytes_todo);
|
|
if (stat == TE_OK) {
|
|
/* Wait for transfer to complete, interrupt should wake us */
|
|
|
|
wait_event(qic02_tape_transfer, dma_mode != 0);
|
|
|
|
if (status_error)
|
|
return_read_eof = YES;
|
|
|
|
} else if (stat != TE_END) {
|
|
/* should do sense() on error here */
|
|
#if 0
|
|
return -ENXIO;
|
|
#else
|
|
printk("Trouble: stat==%02x\n", stat);
|
|
return_read_eof = YES;
|
|
/*************** check EOF/EOT handling!!!!!! **/
|
|
#endif
|
|
}
|
|
end_dma(&bytes_done);
|
|
if (bytes_done > bytes_todo) {
|
|
tpqputs(TPQD_ALWAYS, "read: Oops, read more bytes than requested");
|
|
return -EIO;
|
|
}
|
|
/* copy buffer to user-space in one go */
|
|
if (bytes_done > 0) {
|
|
if (copy_to_user(buf, buffaddr, bytes_done))
|
|
return -EFAULT;
|
|
}
|
|
#if 1
|
|
/* Checks Ton's patch below */
|
|
if ((return_read_eof == NO) && (status_eof_detected == YES)) {
|
|
printk(TPQIC02_NAME ": read(): return_read_eof=%d, status_eof_detected=YES. return_read_eof:=YES\n",
|
|
return_read_eof);
|
|
}
|
|
#endif
|
|
if ((bytes_todo != bytes_done) || (status_eof_detected == YES)) {
|
|
/* EOF or EOM detected. return EOF next time. */
|
|
return_read_eof = YES;
|
|
}
|
|
|
|
}
|
|
/* else: ignore read request for 0 bytes */
|
|
if (bytes_done > 0) {
|
|
status_bytes_rd = YES;
|
|
buf += bytes_done;
|
|
*ppos += bytes_done;
|
|
total_bytes_done += bytes_done;
|
|
count -= bytes_done;
|
|
}
|
|
}
|
|
tpqputs(TPQD_ALWAYS, "read request for <0 bytes");
|
|
return -EINVAL;
|
|
} /* qic02_tape_read */
|
|
|
|
|
|
|
|
/* The drive detects near-EOT by means of the holes in the tape.
|
|
* When the holes are detected, there is some space left. The drive
|
|
* reports this as a TP_EOM exception. After clearing the exception,
|
|
* the drive should accept two extra blocks.
|
|
*
|
|
* It seems there are some archiver programs that would like to use the
|
|
* extra space for writing a continuation marker. The driver should return
|
|
* end-of-file to the user program on writes, when the holes are detected.
|
|
* If the user-program wants to use the extra space, it should use the
|
|
* MTNOP ioctl() to get the generic status register and may then continue
|
|
* writing (max 1kB). ----------- doesn't work yet...............
|
|
*
|
|
* EOF behaviour on writes:
|
|
* If there is enough room, write all of the data.
|
|
* If there is insufficient room, write as much as will fit and
|
|
* return the amount written. If the requested amount differs from the
|
|
* written amount, the application program should recognize that as the
|
|
* end of file. Subsequent writes will return -ENOSPC.
|
|
* Unless the minor bits specify a rewind-on-close, the tape will not
|
|
* be rewound when it is full. The user-program should do that, if desired.
|
|
* If the driver were to do that automatically, a user-program could be
|
|
* confused about the EOT/BOT condition after re-opening the tape device.
|
|
*
|
|
* Multiple volume support: Tar closes the tape device before prompting for
|
|
* the next tape. The user may then insert a new tape and tar will open the
|
|
* tape device again. The driver will detect an exception status in (No Cartridge)
|
|
* and force a rewind. After that tar may continue writing.
|
|
*/
|
|
static ssize_t qic02_tape_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
|
|
{
|
|
int type = iminor(filp->f_dentry->d_inode);
|
|
unsigned short flags = filp->f_flags;
|
|
unsigned long bytes_todo, bytes_done, total_bytes_done = 0;
|
|
|
|
if (status_zombie == YES) {
|
|
tpqputs(TPQD_ALWAYS, "configs not set");
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (TP_DIAGS(current_type)) {
|
|
printk(TPQIC02_NAME ": request WRITE, minor=%x, buf=%p, count=%lx, pos=%Lx, flags=%x\n",
|
|
type, buf, (long) count, filp->f_pos, flags);
|
|
}
|
|
|
|
if (count % TAPE_BLKSIZE) { /* only allow mod 512 bytes at a time */
|
|
tpqputs(TPQD_BLKSZ, "Wrong block size");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (mode_access == READ) {
|
|
tpqputs(TPQD_ALWAYS, "Not in write mode");
|
|
return -EACCES;
|
|
}
|
|
|
|
/* open() does a sense() and we can assume the tape isn't changed
|
|
* between open() and release(), so the tperror.exs bits will still
|
|
* be valid.
|
|
*/
|
|
if ((tperror.exs & TP_ST0) && (tperror.exs & TP_WRP)) {
|
|
tpqputs(TPQD_ALWAYS, "Cartridge is write-protected.");
|
|
return -EACCES; /* don't even try when write protected */
|
|
}
|
|
|
|
if (doing_read == YES) {
|
|
terminate_read(0);
|
|
}
|
|
|
|
while ((signed) count >= 0) {
|
|
/* see how much fits in the kernel buffer */
|
|
bytes_done = 0;
|
|
bytes_todo = TPQBUF_SIZE;
|
|
if (bytes_todo > count) {
|
|
bytes_todo = count;
|
|
}
|
|
|
|
if (return_write_eof == YES) {
|
|
/* return_write_eof should be reset on reverse tape movements. */
|
|
|
|
if (reported_write_eof == NO) {
|
|
if (bytes_todo > 0) {
|
|
tpqputs(TPQD_ALWAYS, "partial write");
|
|
/* partial write signals EOF to user program */
|
|
}
|
|
reported_write_eof = YES;
|
|
return total_bytes_done;
|
|
} else {
|
|
return -ENOSPC; /* return error */
|
|
}
|
|
}
|
|
|
|
/* Quit when done. */
|
|
if (bytes_todo == 0) {
|
|
return total_bytes_done;
|
|
}
|
|
|
|
/* copy from user to DMA buffer and initiate transfer. */
|
|
if (bytes_todo > 0) {
|
|
if (copy_from_user(buffaddr, buf, bytes_todo))
|
|
return -EFAULT;
|
|
|
|
/****************** similar problem with read() at FM could happen here at EOT.
|
|
******************/
|
|
|
|
/***** if at EOT, 0 bytes can be written. start_dma() will
|
|
***** fail and write() will return ENXIO error
|
|
*****/
|
|
if (start_dma(WRITE, bytes_todo) != TE_OK) {
|
|
tpqputs(TPQD_ALWAYS, "write: start_dma() failed");
|
|
/* should do sense() on error here */
|
|
return -ENXIO;
|
|
/*********** FIXTHIS **************/
|
|
}
|
|
|
|
/* Wait for write to complete, interrupt should wake us. */
|
|
wait_event(qic02_tape_transfer, (status_error == 0 && dma_mode != 0));
|
|
|
|
end_dma(&bytes_done);
|
|
if (bytes_done > bytes_todo) {
|
|
tpqputs(TPQD_ALWAYS, "write: Oops, wrote more bytes than requested");
|
|
return -EIO;
|
|
}
|
|
/* If the dma-transfer was aborted because of an exception,
|
|
* status_error will have been set in the interrupt handler.
|
|
* Then end_dma() will do a sense().
|
|
* If the exception was EXC_EOM, the EW-hole was encountered
|
|
* and two more blocks could be written. For the time being we'll
|
|
* just consider this to be the EOT.
|
|
* Otherwise, something Bad happened, such as the maximum number
|
|
* of block-rewrites was exceeded. [e.g. A very bad spot on tape was
|
|
* encountered. Normally short dropouts are compensated for by
|
|
* rewriting the block in error, up to 16 times. I'm not sure
|
|
* QIC-24 drives can do this.]
|
|
*/
|
|
if (status_error) {
|
|
if (status_eom_detected == YES) {
|
|
tpqputs(TPQD_ALWAYS, "write: EW detected");
|
|
return_write_eof = YES;
|
|
} else {
|
|
/* probably EXC_RWA */
|
|
tpqputs(TPQD_ALWAYS, "write: dma: error in writing");
|
|
return -EIO;
|
|
}
|
|
}
|
|
if (bytes_todo != bytes_done) {
|
|
/* EOF or EOM detected. return EOT next time. */
|
|
return_write_eof = YES;
|
|
}
|
|
}
|
|
/* else: ignore write request for 0 bytes. */
|
|
|
|
if (bytes_done > 0) {
|
|
status_bytes_wr = YES;
|
|
buf += bytes_done;
|
|
*ppos += bytes_done;
|
|
total_bytes_done += bytes_done;
|
|
count -= bytes_done;
|
|
}
|
|
}
|
|
|
|
tpqputs(TPQD_ALWAYS, "write request for <0 bytes");
|
|
if (TPQDBG(DEBUG)) {
|
|
printk(TPQIC02_NAME ": status_bytes_wr %x, buf %p"
|
|
", total_bytes_done %lx, count %lx\n",
|
|
status_bytes_wr, buf, total_bytes_done,
|
|
(long) count);
|
|
}
|
|
return -EINVAL;
|
|
} /* qic02_tape_write */
|
|
|
|
|
|
|
|
/* qic02_tape_open()
|
|
* We allow the device to be opened, even if it is marked 'dead' because
|
|
* we want to be able to reset the tape device without rebooting.
|
|
* Only one open tape file at a time, except when minor=255.
|
|
* Minor 255 is only allowed for resetting and always returns <0.
|
|
*
|
|
* The density command is only allowed when TP_BOM is set. Thus, remember
|
|
* the most recently used minor bits. When they are different from the
|
|
* remembered values, rewind the tape and set the required density.
|
|
* Don't rewind if the minor bits specify density 0.
|
|
*/
|
|
|
|
static int qic02_tape_open(struct inode *inode, struct file *filp)
|
|
{
|
|
static int qic02_tape_open_no_use_count(struct inode *,
|
|
struct file *);
|
|
int open_error;
|
|
|
|
open_error = qic02_tape_open_no_use_count(inode, filp);
|
|
return open_error;
|
|
}
|
|
|
|
static int qic02_tape_open_no_use_count(struct inode *inode,
|
|
struct file *filp)
|
|
{
|
|
int type = iminor(inode);
|
|
unsigned short flags = filp->f_flags;
|
|
unsigned short dens = 0;
|
|
int s;
|
|
|
|
|
|
if (TP_DIAGS(type)) {
|
|
printk("qic02_tape_open: dev=tpqic2(%d), flags=%x ",
|
|
type, flags);
|
|
}
|
|
|
|
if (type == 255) { /* special case for resetting */
|
|
if (capable(CAP_SYS_ADMIN)) {
|
|
return (tape_reset(1) == TE_OK) ? -EAGAIN : -ENXIO;
|
|
} else {
|
|
return -EPERM;
|
|
}
|
|
}
|
|
|
|
if (status_dead == YES) {
|
|
/* Allow `mt reset' ioctl() even when already open()ed. */
|
|
return 0;
|
|
}
|
|
|
|
if(test_and_set_bit(0, &tape_open))
|
|
return -EBUSY;
|
|
|
|
if (status_zombie == YES) {
|
|
/* no irq/dma/port stuff allocated yet, no reset done
|
|
* yet, so return until MTSETCONFIG has been done.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
status_bytes_rd = NO;
|
|
status_bytes_wr = NO;
|
|
|
|
return_read_eof = NO; /********????????????????*****/
|
|
return_write_eof = (status_eot_detected) ? YES : NO;
|
|
|
|
/* Clear this in case user app close()d before reading EOF token */
|
|
status_eof_detected = NO;
|
|
|
|
reported_read_eof = NO;
|
|
reported_write_eof = NO;
|
|
|
|
|
|
switch (flags & O_ACCMODE) {
|
|
case O_RDONLY:
|
|
mode_access = READ;
|
|
break;
|
|
case O_WRONLY: /* Fallthru... Strictly speaking this is not correct... */
|
|
case O_RDWR: /* Reads are allowed as long as nothing is written */
|
|
mode_access = WRITE;
|
|
break;
|
|
}
|
|
|
|
/* This is to avoid tape-changed problems (TP_CNI exception).
|
|
*
|
|
* Since removing the cartridge will not raise an exception,
|
|
* we always do a tp_sense() to make sure we have the proper
|
|
* CNI status, the 2150L may need an additional sense.... - Eddy
|
|
*/
|
|
s = tp_sense(TP_WRP | TP_EOM | TP_BOM | TP_CNI | TP_EOR);
|
|
|
|
if (s == TE_OK) {
|
|
/* Try to clear cartridge-changed status for Archive-2150L */
|
|
if ((tperror.exs & TP_ST0) && (tperror.exs & TP_CNI)) {
|
|
s = tp_sense(TP_WRP | TP_EOM | TP_BOM | TP_CNI | TP_EOR);
|
|
}
|
|
}
|
|
|
|
if (s != TE_OK) {
|
|
tpqputs(TPQD_ALWAYS, "open: sense() failed");
|
|
clear_bit(0, &tape_open);
|
|
return -EIO;
|
|
}
|
|
|
|
/* exception bits should be up-to-date now, so check for
|
|
* tape presence and exit if absent.
|
|
* Even `mt stat' will fail without a tape.
|
|
*/
|
|
if ((tperror.exs & TP_ST0) && (tperror.exs & TP_CNI)) {
|
|
tpqputs(TPQD_ALWAYS, "No tape present.");
|
|
clear_bit(0, &tape_open);
|
|
return -EIO;
|
|
}
|
|
|
|
/* At this point we can assume that a tape is present and
|
|
* that it will remain present until release() is called.
|
|
*/
|
|
|
|
/* not allowed to do QCMD_DENS_* unless tape is rewound */
|
|
if ((TP_DENS(type) != 0) && (TP_DENS(current_type) != TP_DENS(type))) {
|
|
/* force rewind if minor bits have changed,
|
|
* i.e. user wants to use tape in different format.
|
|
* [assuming single drive operation]
|
|
*/
|
|
if (TP_HAVE_DENS) {
|
|
tpqputs(TPQD_REWIND, "Density minor bits have changed. Forcing rewind.");
|
|
need_rewind = YES;
|
|
}
|
|
} else {
|
|
/* density bits still the same, but TP_DIAGS bit
|
|
* may have changed.
|
|
*/
|
|
current_type = type;
|
|
}
|
|
|
|
if (need_rewind == YES) {
|
|
/***************** CHECK THIS!!!!!!!! **********/
|
|
s = do_qic_cmd(QCMD_REWIND, TIM_R);
|
|
if (s != 0) {
|
|
tpqputs(TPQD_ALWAYS, "open: rewind failed");
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
|
|
/* Note: After a reset command, the controller will rewind the tape
|
|
* just before performing any tape movement operation! ************ SO SET need_rewind flag!!!!!
|
|
*/
|
|
if (status_dead == YES) {
|
|
tpqputs(TPQD_ALWAYS, "open: tape dead, attempting reset");
|
|
if (tape_reset(1) != TE_OK) {
|
|
return -ENXIO;
|
|
} else {
|
|
status_dead = NO;
|
|
if (tp_sense(~(TP_ST1 | TP_ILL)) != TE_OK) {
|
|
tpqputs(TPQD_ALWAYS, "open: tp_sense() failed\n");
|
|
status_dead = YES; /* try reset next time */
|
|
return -EIO;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* things should be ok, once we get here */
|
|
|
|
|
|
/* set density: only allowed when TP_BOM status bit is set,
|
|
* so we must have done a rewind by now. If not, just skip over.
|
|
* Only give set density command when minor bits have changed.
|
|
*/
|
|
if (TP_DENS(current_type) == TP_DENS(type)) {
|
|
return 0;
|
|
}
|
|
|
|
current_type = type;
|
|
need_rewind = NO;
|
|
if (TP_HAVE_DENS) {
|
|
dens = TP_DENS(type);
|
|
}
|
|
|
|
if (dens < sizeof(format_names) / sizeof(char *))
|
|
printk(TPQIC02_NAME ": format: %s%s\n", (dens != 0) ? "QIC-" : "", format_names[dens]);
|
|
else
|
|
tpqputs(TPQD_REWIND, "Wait for retensioning...");
|
|
|
|
switch (TP_DENS(type)) {
|
|
case 0: /* Minor 0 is for drives without set-density support */
|
|
s = 0;
|
|
break;
|
|
case 1:
|
|
s = do_qic_cmd(QCMD_DENS_11, TIM_S);
|
|
break;
|
|
case 2:
|
|
s = do_qic_cmd(QCMD_DENS_24, TIM_S);
|
|
break;
|
|
case 3:
|
|
s = do_qic_cmd(QCMD_DENS_120, TIM_S);
|
|
break;
|
|
case 4:
|
|
s = do_qic_cmd(QCMD_DENS_150, TIM_S);
|
|
break;
|
|
case 5:
|
|
s = do_qic_cmd(QCMD_DENS_300, TIM_S);
|
|
break;
|
|
case 6:
|
|
s = do_qic_cmd(QCMD_DENS_600, TIM_S);
|
|
break;
|
|
default: /* otherwise do a retension before anything else */
|
|
s = do_qic_cmd(QCMD_RETEN, TIM_R);
|
|
}
|
|
if (s != 0) {
|
|
status_dead = YES; /* force reset */
|
|
current_type = 0;/* earlier 0xff80 */
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
} /* qic02_tape_open */
|
|
|
|
|
|
static int qic02_tape_release(struct inode *inode, struct file *filp)
|
|
{
|
|
int type = iminor(inode);
|
|
|
|
if (TP_DIAGS(type)) {
|
|
printk("qic02_tape_release: dev=tpqic2(%d)\n", type);
|
|
}
|
|
|
|
if (status_zombie == NO) { /* don't rewind in zombie mode */
|
|
/* Terminate any pending write cycle. Terminating the read-cycle
|
|
* is delayed until it is required to do so for a new command.
|
|
*/
|
|
terminate_write(-1);
|
|
|
|
if (status_dead == YES) {
|
|
tpqputs(TPQD_ALWAYS, "release: device dead!?");
|
|
}
|
|
|
|
/* Rewind only if minor number requires it AND
|
|
* read/writes have been done. ************* IS THIS CORRECT??????????
|
|
*/
|
|
if (TP_REWCLOSE(type) && (status_bytes_rd | status_bytes_wr)) {
|
|
tpqputs(TPQD_REWIND, "release: Doing rewind...");
|
|
(void) do_qic_cmd(QCMD_REWIND, TIM_R);
|
|
}
|
|
}
|
|
clear_bit(0, &tape_open);
|
|
return 0;
|
|
} /* qic02_tape_release */
|
|
|
|
|
|
#ifdef CONFIG_QIC02_DYNCONF
|
|
/* Set masks etc. based on the interface card type. */
|
|
static int update_ifc_masks(int ifc)
|
|
{
|
|
QIC02_TAPE_IFC = ifc;
|
|
|
|
if ((QIC02_TAPE_IFC == WANGTEK) || (QIC02_TAPE_IFC == EVEREX)) {
|
|
QIC02_STAT_PORT = QIC02_TAPE_PORT;
|
|
QIC02_CTL_PORT = QIC02_TAPE_PORT;
|
|
QIC02_CMD_PORT = QIC02_TAPE_PORT + 1;
|
|
QIC02_DATA_PORT = QIC02_TAPE_PORT + 1;
|
|
QIC02_STAT_READY = WT_QIC02_STAT_READY;
|
|
QIC02_STAT_EXCEPTION = WT_QIC02_STAT_EXCEPTION;
|
|
QIC02_STAT_MASK = WT_QIC02_STAT_MASK;
|
|
|
|
QIC02_STAT_RESETMASK = WT_QIC02_STAT_RESETMASK;
|
|
QIC02_STAT_RESETVAL = WT_QIC02_STAT_RESETVAL;
|
|
|
|
QIC02_CTL_RESET = WT_QIC02_CTL_RESET;
|
|
QIC02_CTL_REQUEST = WT_QIC02_CTL_REQUEST;
|
|
|
|
if (QIC02_TAPE_DMA == 3) {
|
|
WT_CTL_DMA = WT_CTL_DMA3;
|
|
} else if (QIC02_TAPE_DMA == 1) {
|
|
WT_CTL_DMA = WT_CTL_DMA1;
|
|
} else {
|
|
tpqputs(TPQD_ALWAYS,
|
|
"Unsupported or incorrect DMA channel");
|
|
return -EIO;
|
|
}
|
|
|
|
if (QIC02_TAPE_IFC == EVEREX) {
|
|
/* Everex is a special case for Wangtek (actually
|
|
* it's the other way 'round, but I saw Wangtek first)
|
|
*/
|
|
if (QIC02_TAPE_DMA == 3) {
|
|
WT_CTL_DMA = WT_CTL_DMA1;
|
|
}
|
|
|
|
/* Fixup the kernel copy of the IFC type to that
|
|
* we don't have to distinguish between Wangtek and
|
|
* and Everex at runtime.
|
|
*/
|
|
QIC02_TAPE_IFC = WANGTEK;
|
|
}
|
|
} else if (QIC02_TAPE_IFC == ARCHIVE) {
|
|
QIC02_STAT_PORT = QIC02_TAPE_PORT + 1;
|
|
QIC02_CTL_PORT = QIC02_TAPE_PORT + 1;
|
|
QIC02_CMD_PORT = QIC02_TAPE_PORT;
|
|
QIC02_DATA_PORT = QIC02_TAPE_PORT;
|
|
QIC02_STAT_READY = AR_QIC02_STAT_READY;
|
|
QIC02_STAT_EXCEPTION = AR_QIC02_STAT_EXCEPTION;
|
|
QIC02_STAT_MASK = AR_QIC02_STAT_MASK;
|
|
|
|
QIC02_STAT_RESETMASK = AR_QIC02_STAT_RESETMASK;
|
|
QIC02_STAT_RESETVAL = AR_QIC02_STAT_RESETVAL;
|
|
|
|
QIC02_CTL_RESET = AR_QIC02_CTL_RESET;
|
|
QIC02_CTL_REQUEST = AR_QIC02_CTL_REQUEST;
|
|
|
|
if (QIC02_TAPE_DMA > 3) {
|
|
tpqputs(TPQD_ALWAYS,
|
|
"Unsupported or incorrect DMA channel");
|
|
return -EIO;
|
|
}
|
|
} else if (QIC02_TAPE_IFC == MOUNTAIN) {
|
|
QIC02_STAT_PORT = QIC02_TAPE_PORT + 1;
|
|
QIC02_CTL_PORT = QIC02_TAPE_PORT + 1;
|
|
QIC02_CMD_PORT = QIC02_TAPE_PORT;
|
|
QIC02_DATA_PORT = QIC02_TAPE_PORT;
|
|
|
|
QIC02_STAT_READY = MTN_QIC02_STAT_READY;
|
|
QIC02_STAT_EXCEPTION = MTN_QIC02_STAT_EXCEPTION;
|
|
QIC02_STAT_MASK = MTN_QIC02_STAT_MASK;
|
|
|
|
QIC02_STAT_RESETMASK = MTN_QIC02_STAT_RESETMASK;
|
|
QIC02_STAT_RESETVAL = MTN_QIC02_STAT_RESETVAL;
|
|
|
|
QIC02_CTL_RESET = MTN_QIC02_CTL_RESET;
|
|
QIC02_CTL_REQUEST = MTN_QIC02_CTL_REQUEST;
|
|
|
|
if (QIC02_TAPE_DMA > 3) {
|
|
tpqputs(TPQD_ALWAYS,
|
|
"Unsupported or incorrect DMA channel");
|
|
return -EIO;
|
|
}
|
|
} else {
|
|
tpqputs(TPQD_ALWAYS, "Invalid interface type");
|
|
return -ENXIO;
|
|
}
|
|
return qic02_get_resources();
|
|
} /* update_ifc_masks */
|
|
#endif
|
|
|
|
|
|
/* ioctl allows user programs to rewind the tape and stuff like that */
|
|
static int qic02_tape_ioctl(struct inode *inode, struct file *filp, unsigned int iocmd, unsigned long ioarg)
|
|
{
|
|
int error;
|
|
int c;
|
|
struct mtop operation;
|
|
unsigned char blk_addr[6];
|
|
struct mtpos ioctl_tell;
|
|
void __user *argp = (void __user *)ioarg;
|
|
|
|
|
|
if (TP_DIAGS(current_type))
|
|
printk(TPQIC02_NAME ": ioctl(%4x, %4lx)\n", iocmd, ioarg);
|
|
|
|
if (!inode)
|
|
return -EINVAL;
|
|
|
|
/* check iocmd first */
|
|
|
|
c = _IOC_NR(iocmd);
|
|
|
|
#ifdef CONFIG_QIC02_DYNCONF
|
|
if (c == _IOC_NR(MTIOCGETCONFIG)) {
|
|
CHECK_IOC_SIZE(mtconfiginfo);
|
|
|
|
if (copy_to_user(argp, &qic02_tape_dynconf, sizeof(qic02_tape_dynconf)))
|
|
return -EFAULT;
|
|
return 0;
|
|
} else if (c == _IOC_NR(MTIOCSETCONFIG)) {
|
|
/* One should always do a MTIOCGETCONFIG first, then update
|
|
* user-settings, then write back with MTIOCSETCONFIG.
|
|
* The qic02conf program should re-open() the device before actual
|
|
* use, to make sure everything is initialized.
|
|
*/
|
|
|
|
CHECK_IOC_SIZE(mtconfiginfo);
|
|
|
|
if (!capable(CAP_SYS_RAWIO))
|
|
return -EPERM;
|
|
|
|
if (doing_read != NO || doing_write != NO)
|
|
return -EBUSY;
|
|
|
|
if (status_zombie == NO)
|
|
qic02_release_resources(); /* and go zombie */
|
|
|
|
/* copy struct from user space to kernel space */
|
|
if (copy_from_user(&qic02_tape_dynconf, argp, sizeof(qic02_tape_dynconf)))
|
|
return -EFAULT;
|
|
|
|
return update_ifc_masks(qic02_tape_dynconf.ifc_type);
|
|
}
|
|
if (status_zombie == YES) {
|
|
tpqputs(TPQD_ALWAYS, "Configs not set");
|
|
return -ENXIO;
|
|
}
|
|
#endif
|
|
if (c == _IOC_NR(MTIOCTOP)) {
|
|
CHECK_IOC_SIZE(mtop);
|
|
|
|
/* copy mtop struct from user space to kernel space */
|
|
if (copy_from_user(&operation, argp, sizeof(operation)))
|
|
return -EFAULT;
|
|
|
|
/* ---note: mt_count is signed, negative seeks must be
|
|
* --- translated to seeks in opposite direction!
|
|
* (only needed for Sun-programs, I think.)
|
|
*/
|
|
/* ---note: MTFSF with count 0 should position the
|
|
* --- tape at the beginning of the current file.
|
|
*/
|
|
|
|
if (TP_DIAGS(current_type))
|
|
printk("OP op=%4x, count=%4x\n", operation.mt_op, operation.mt_count);
|
|
|
|
if (operation.mt_count < 0)
|
|
tpqputs(TPQD_ALWAYS, "Warning: negative mt_count ignored");
|
|
|
|
ioctl_status.mt_resid = operation.mt_count;
|
|
if (operation.mt_op == MTSEEK) {
|
|
if (!TP_HAVE_SEEK)
|
|
return -ENOTTY;
|
|
|
|
seek_addr_buf[0] = (operation.mt_count >> 16) & 0xff;
|
|
seek_addr_buf[1] = (operation.mt_count >> 8) & 0xff;
|
|
seek_addr_buf[2] = (operation.mt_count) & 0xff;
|
|
if (operation.mt_count >> 24)
|
|
return -EINVAL;
|
|
|
|
if ((error = do_ioctl_cmd(operation.mt_op)) != 0)
|
|
return error;
|
|
|
|
ioctl_status.mt_resid = 0;
|
|
} else {
|
|
while (operation.mt_count > 0) {
|
|
operation.mt_count--;
|
|
if ((error = do_ioctl_cmd(operation.mt_op)) != 0)
|
|
return error;
|
|
|
|
ioctl_status.mt_resid = operation.mt_count;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
} else if (c == _IOC_NR(MTIOCGET)) {
|
|
if (TP_DIAGS(current_type))
|
|
printk("GET ");
|
|
|
|
CHECK_IOC_SIZE(mtget);
|
|
|
|
/* It appears (gmt(1)) that it is normal behaviour to
|
|
* first set the status with MTNOP, and then to read
|
|
* it out with MTIOCGET
|
|
*/
|
|
|
|
/* copy results to user space */
|
|
if (copy_to_user(argp, &ioctl_status, sizeof(ioctl_status)))
|
|
return -EFAULT;
|
|
return 0;
|
|
} else if (TP_HAVE_TELL && (c == _IOC_NR(MTIOCPOS))) {
|
|
if (TP_DIAGS(current_type))
|
|
printk("POS ");
|
|
|
|
CHECK_IOC_SIZE(mtpos);
|
|
|
|
tpqputs(TPQD_IOCTLS, "MTTELL reading block address");
|
|
if (doing_read == YES || doing_write == YES)
|
|
finish_rw(AR_QCMDV_TELL_BLK);
|
|
|
|
c = rdstatus((char *) blk_addr, sizeof(blk_addr), AR_QCMDV_TELL_BLK);
|
|
if (c != TE_OK)
|
|
return -EIO;
|
|
|
|
ioctl_tell.mt_blkno = (blk_addr[3] << 16) | (blk_addr[4] << 8) | blk_addr[5];
|
|
|
|
/* copy results to user space */
|
|
if (copy_to_user(argp, &ioctl_tell, sizeof(ioctl_tell)))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
} else
|
|
return -ENOTTY; /* Other cmds not supported. */
|
|
} /* qic02_tape_ioctl */
|
|
|
|
|
|
static ssize_t qic02_do_tape_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
|
|
{
|
|
int err;
|
|
|
|
down(&tape_op);
|
|
err = qic02_tape_read(filp, buf, count, ppos);
|
|
up(&tape_op);
|
|
|
|
return err;
|
|
}
|
|
|
|
static ssize_t qic02_do_tape_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
|
|
{
|
|
int err;
|
|
|
|
down(&tape_op);
|
|
err = qic02_tape_write(filp, buf, count, ppos);
|
|
up(&tape_op);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int qic02_do_tape_ioctl(struct inode *inode, struct file *filp, unsigned int iocmd, unsigned long ioarg)
|
|
{
|
|
int err;
|
|
|
|
down(&tape_op);
|
|
err = qic02_tape_ioctl(inode, filp, iocmd, ioarg);
|
|
up(&tape_op);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* These are (most) of the interface functions: */
|
|
static struct file_operations qic02_tape_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.read = qic02_do_tape_read,
|
|
.write = qic02_do_tape_write,
|
|
.ioctl = qic02_do_tape_ioctl,
|
|
.open = qic02_tape_open,
|
|
.release = qic02_tape_release,
|
|
};
|
|
|
|
|
|
static void qic02_release_resources(void)
|
|
{
|
|
free_irq(QIC02_TAPE_IRQ, NULL);
|
|
free_dma(QIC02_TAPE_DMA);
|
|
release_region(QIC02_TAPE_PORT, QIC02_TAPE_PORT_RANGE);
|
|
if (buffaddr)
|
|
free_pages((unsigned long) buffaddr, get_order(TPQBUF_SIZE));
|
|
buffaddr = NULL; /* Better to cause a panic than overwite someone else */
|
|
status_zombie = YES;
|
|
} /* qic02_release_resources */
|
|
|
|
|
|
static int qic02_get_resources(void)
|
|
{
|
|
/* First perform some checks. If one of them fails,
|
|
* the tape driver will not be registered to the system.
|
|
*/
|
|
|
|
/* for DYNCONF, allocating IO, DMA and IRQ should not be done until
|
|
* the config parameters have been set using MTSETCONFIG.
|
|
*/
|
|
|
|
/* Grab the IO region. */
|
|
if (!request_region(QIC02_TAPE_PORT, QIC02_TAPE_PORT_RANGE, TPQIC02_NAME)) {
|
|
printk(TPQIC02_NAME ": IO space at 0x%x [%d ports] already reserved\n",
|
|
QIC02_TAPE_PORT, QIC02_TAPE_PORT_RANGE);
|
|
return -ENXIO;
|
|
}
|
|
|
|
/* get IRQ */
|
|
if (request_irq(QIC02_TAPE_IRQ, qic02_tape_interrupt, SA_INTERRUPT, "QIC-02", NULL)) {
|
|
printk(TPQIC02_NAME ": can't allocate IRQ%d for QIC-02 tape\n", QIC02_TAPE_IRQ);
|
|
release_region(QIC02_TAPE_PORT, QIC02_TAPE_PORT_RANGE);
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* After IRQ, allocate DMA channel */
|
|
if (request_dma(QIC02_TAPE_DMA, "QIC-02")) {
|
|
printk(TPQIC02_NAME ": can't allocate DMA%d for QIC-02 tape\n", QIC02_TAPE_DMA);
|
|
free_irq(QIC02_TAPE_IRQ, NULL);
|
|
release_region(QIC02_TAPE_PORT, QIC02_TAPE_PORT_RANGE);
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* Setup the page-address for the dma transfer. */
|
|
buffaddr = (void *) __get_dma_pages(GFP_KERNEL, get_order(TPQBUF_SIZE));
|
|
if (!buffaddr) {
|
|
qic02_release_resources();
|
|
return -EBUSY; /* Not ideal, EAGAIN perhaps? */
|
|
}
|
|
|
|
memset(buffaddr, 0, TPQBUF_SIZE);
|
|
|
|
printk(TPQIC02_NAME ": Settings: IRQ %d, DMA %d, IO 0x%x, IFC %s\n",
|
|
QIC02_TAPE_IRQ, QIC02_TAPE_DMA, ((QIC02_TAPE_IFC == ARCHIVE)
|
|
|| (QIC02_TAPE_IFC ==
|
|
MOUNTAIN)) ?
|
|
QIC02_CMD_PORT : QIC02_STAT_PORT,
|
|
(QIC02_TAPE_IFC ==
|
|
MOUNTAIN) ? "Mountain" : ((QIC02_TAPE_IFC ==
|
|
ARCHIVE) ? "Archive" :
|
|
"Wangtek"));
|
|
|
|
if (tape_reset(0) != TE_OK || tp_sense(TP_WRP | TP_POR | TP_CNI) != TE_OK) {
|
|
/* No drive detected, so vanish */
|
|
tpqputs(TPQD_ALWAYS, "No drive detected -- releasing IO/IRQ/DMA.");
|
|
status_dead = YES;
|
|
qic02_release_resources();
|
|
return -EIO;
|
|
}
|
|
|
|
/* All should be ok now */
|
|
status_zombie = NO;
|
|
return 0;
|
|
} /* qic02_get_resources */
|
|
|
|
int __init qic02_tape_init(void)
|
|
{
|
|
if (TPSTATSIZE != 6) {
|
|
printk(TPQIC02_NAME ": internal error: tpstatus struct incorrect!\n");
|
|
return -ENODEV;
|
|
}
|
|
if ((TPQBUF_SIZE < 512) || (TPQBUF_SIZE >= 0x10000)) {
|
|
printk(TPQIC02_NAME ": internal error: DMA buffer size out of range\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
current_type = 0;
|
|
|
|
#ifndef CONFIG_QIC02_DYNCONF
|
|
printk(TPQIC02_NAME ": IRQ %d, DMA %d, IO 0x%x, IFC %s, %s, %s\n",
|
|
QIC02_TAPE_IRQ, QIC02_TAPE_DMA,
|
|
# if QIC02_TAPE_IFC == WANGTEK
|
|
QIC02_STAT_PORT, "Wangtek",
|
|
# elif QIC02_TAPE_IFC == ARCHIVE
|
|
QIC02_CMD_PORT, "Archive",
|
|
# elif QIC02_TAPE_IFC == MOUNTAIN
|
|
QIC02_CMD_PORT, "Mountain",
|
|
# else
|
|
# error
|
|
# endif
|
|
rcs_revision, rcs_date);
|
|
if (qic02_get_resources())
|
|
return -ENODEV;
|
|
#else
|
|
printk(TPQIC02_NAME ": Runtime config, %s, %s\n", rcs_revision, rcs_date);
|
|
#endif
|
|
printk(TPQIC02_NAME ": DMA buffers: %u blocks\n", NR_BLK_BUF);
|
|
/* If we got this far, install driver functions */
|
|
if (register_chrdev(QIC02_TAPE_MAJOR, TPQIC02_NAME, &qic02_tape_fops))
|
|
{
|
|
printk(TPQIC02_NAME ": Unable to get chrdev major %d\n", QIC02_TAPE_MAJOR);
|
|
#ifndef CONFIG_QIC02_DYNCONF
|
|
qic02_release_resources();
|
|
#endif
|
|
return -ENODEV;
|
|
}
|
|
|
|
tpqic02_class = class_simple_create(THIS_MODULE, TPQIC02_NAME);
|
|
class_simple_device_add(tpqic02_class, MKDEV(QIC02_TAPE_MAJOR, 2), NULL, "ntpqic11");
|
|
devfs_mk_cdev(MKDEV(QIC02_TAPE_MAJOR, 2),
|
|
S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, "ntpqic11");
|
|
class_simple_device_add(tpqic02_class, MKDEV(QIC02_TAPE_MAJOR, 3), NULL, "tpqic11");
|
|
devfs_mk_cdev(MKDEV(QIC02_TAPE_MAJOR, 3),
|
|
S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, "tpqic11");
|
|
|
|
class_simple_device_add(tpqic02_class, MKDEV(QIC02_TAPE_MAJOR, 4), NULL, "ntpqic24");
|
|
devfs_mk_cdev(MKDEV(QIC02_TAPE_MAJOR, 4),
|
|
S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, "ntpqic24");
|
|
class_simple_device_add(tpqic02_class, MKDEV(QIC02_TAPE_MAJOR, 5), NULL, "tpqic24");
|
|
devfs_mk_cdev(MKDEV(QIC02_TAPE_MAJOR, 5),
|
|
S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, "tpqic24");
|
|
|
|
class_simple_device_add(tpqic02_class, MKDEV(QIC02_TAPE_MAJOR, 6), NULL, "ntpqic20");
|
|
devfs_mk_cdev(MKDEV(QIC02_TAPE_MAJOR, 6),
|
|
S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, "ntpqic120");
|
|
class_simple_device_add(tpqic02_class, MKDEV(QIC02_TAPE_MAJOR, 7), NULL, "tpqic20");
|
|
devfs_mk_cdev(MKDEV(QIC02_TAPE_MAJOR, 7),
|
|
S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, "tpqic120");
|
|
|
|
class_simple_device_add(tpqic02_class, MKDEV(QIC02_TAPE_MAJOR, 8), NULL, "ntpqic50");
|
|
devfs_mk_cdev(MKDEV(QIC02_TAPE_MAJOR, 8),
|
|
S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, "ntpqic150");
|
|
class_simple_device_add(tpqic02_class, MKDEV(QIC02_TAPE_MAJOR, 9), NULL, "tpqic50");
|
|
devfs_mk_cdev(MKDEV(QIC02_TAPE_MAJOR, 9),
|
|
S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, "tpqic150");
|
|
|
|
init_waitqueue_head(&qic02_tape_transfer);
|
|
/* prepare timer */
|
|
TIMEROFF;
|
|
init_timer(&tp_timer);
|
|
tp_timer.function = qic02_tape_times_out;
|
|
|
|
#ifndef CONFIG_QIC02_DYNCONF
|
|
if (tape_reset(0) != TE_OK || tp_sense(TP_WRP | TP_POR | TP_CNI) != TE_OK) {
|
|
/* No drive detected, so vanish */
|
|
tpqputs(TPQD_ALWAYS, "No drive detected -- driver going on vacation...");
|
|
qic02_release_resources();
|
|
status_dead = YES;
|
|
return -ENODEV;
|
|
} else {
|
|
if (is_exception()) {
|
|
tpqputs(TPQD_ALWAYS, "exception detected\n");
|
|
(void) tp_sense(TP_WRP | TP_POR | TP_CNI);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* initialize generic status for ioctl requests */
|
|
|
|
ioctl_status.mt_type = QIC02_TAPE_DRIVE; /* MT_IS* id nr */
|
|
|
|
ioctl_status.mt_resid = 0; /* ---residual count */
|
|
ioctl_status.mt_gstat = 0; /* ---generic status */
|
|
ioctl_status.mt_erreg = 0; /* not used */
|
|
ioctl_status.mt_fileno = 0; /* number of current file on tape */
|
|
ioctl_status.mt_blkno = 0; /* number of current (logical) block */
|
|
|
|
return 0;
|
|
} /* qic02_tape_init */
|
|
|
|
static void qic02_module_exit(void)
|
|
{
|
|
unregister_chrdev(QIC02_TAPE_MAJOR, TPQIC02_NAME);
|
|
if (status_zombie == NO)
|
|
qic02_release_resources();
|
|
|
|
devfs_remove("ntpqic11");
|
|
class_simple_device_remove(MKDEV(QIC02_TAPE_MAJOR, 2));
|
|
devfs_remove("tpqic11");
|
|
class_simple_device_remove(MKDEV(QIC02_TAPE_MAJOR, 3));
|
|
devfs_remove("ntpqic24");
|
|
class_simple_device_remove(MKDEV(QIC02_TAPE_MAJOR, 4));
|
|
devfs_remove("tpqic24");
|
|
class_simple_device_remove(MKDEV(QIC02_TAPE_MAJOR, 5));
|
|
devfs_remove("ntpqic120");
|
|
class_simple_device_remove(MKDEV(QIC02_TAPE_MAJOR, 6));
|
|
devfs_remove("tpqic120");
|
|
class_simple_device_remove(MKDEV(QIC02_TAPE_MAJOR, 7));
|
|
devfs_remove("ntpqic150");
|
|
class_simple_device_remove(MKDEV(QIC02_TAPE_MAJOR, 8));
|
|
devfs_remove("tpqic150");
|
|
class_simple_device_remove(MKDEV(QIC02_TAPE_MAJOR, 9));
|
|
|
|
class_simple_destroy(tpqic02_class);
|
|
}
|
|
|
|
static int qic02_module_init(void)
|
|
{
|
|
int retval;
|
|
retval = qic02_tape_init();
|
|
# ifdef CONFIG_QIC02_DYNCONF
|
|
/* This allows the dynamic config program to setup the card
|
|
* by presetting qic02_tape_dynconf via insmod
|
|
*/
|
|
if (!retval && qic02_tape_dynconf.ifc_type) {
|
|
retval = update_ifc_masks(qic02_tape_dynconf.ifc_type);
|
|
if (retval) {
|
|
qic02_module_exit();
|
|
}
|
|
}
|
|
# endif
|
|
return retval;
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(qic02_module_init);
|
|
module_exit(qic02_module_exit);
|