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kernel / pub / scm / linux / kernel / git / nico / archive / refs/tags/v0.99-pl12 / . / kernel / chr_drv / tpqic02.c
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/* $Id: tpqic02.c,v 0.2.1.21 1993/06/18 19:04:33 root Exp root $
*
* Driver for tape drive support for Linux-i386 0.99.12.
*
* Copyright (c) 1993 by H. H. Bergman. All rights reserved.
* Current e-mail address: csg279@wing.rug.nl
* [If you are unable to reach me directly, try the TAPE mailing list
* channel on linux-activists@niksula.hut.fi using "X-Mn-Key: TAPE" as
* the first line in your message.]
*
* Distribution of this program in executable form is only allowed if
* all of the corresponding source files are made available through the same
* medium at no extra cost.
*
* I will not accept any responsibility for damage caused directly or
* indirectly by this program, or code derived from this program.
*
* Use this code at your own risk. Don't blame me if it destroys your data!
* Make sure you have a backup before you try this code.
*
* This driver was partially inspired by the 'wt' driver in the 386BSD
* source distribution, which carries the following copyright notice:
*
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* You are not allowed to change this line nor the text above.
*
* $Log: tpqic02.c,v $
* Revision 0.2.1.21 1993/06/18 19:04:33 root
* minor fixes for 0.99.10.
*
* Revision 0.2.1.20 1993/06/11 21:38:51 root
* Added exception code for status 0x8000 (Cypher weirdness).
*
* Revision 0.2.1.19 1993/04/19 23:13:59 root
* Cleanups. Changed to 0.99.8.
*
* Revision 0.2.1.18 1993/03/22 17:39:47 root
* Moved to 0.99.7. Added Archive MTSEEK and MTTELL support.
*
* Revision 0.2.1.17 1993/03/08 18:51:59 root
* Tried to `fix' write-once bug in previous release.
*
* Revision 0.2.1.16 1993/03/01 00:06:16 root
* Use register_chrdev() for 0.99.6.
*
* Revision 0.2.1.15 1993/02/25 00:14:25 root
* minor cleanups.
*
* Revision 0.2.1.14 1993/01/25 00:06:14 root
* Kernel udelay. Eof fixups.
* Removed report_ read/write dummies; have strace(1) now.
*
* Revision 0.2.1.13 1993/01/10 02:24:43 root
* Rewrote wait_for_ready() to use newer schedule() features.
* This improves performance for rewinds etc.
*
* Revision 0.2.1.12 1993/01/05 18:44:09 root
* Changes for 0.99.1. Fixed `restartable reads'.
*
* Revision 0.2.1.11 1992/11/28 01:19:10 root
* Changes to exception handling (significant).
* Changed returned error codes. Hopefully they're correct now.
* Changed declarations to please gcc-2.3.1.
* Patch to deal with bogus interrupts for Archive cards.
*
* Revision 0.2.1.10 1992/10/28 00:50:44 root
* underrun/error counter needed byte swapping.
*
* Revision 0.2.1.9 1992/10/15 17:06:01 root
* Removed online() stuff. Changed EOF handling.
*
* Revision 0.2.1.8 1992/10/02 22:25:48 root
* Removed `no_sleep' parameters (got usleep() now),
* cleaned up some comments.
*
* Revision 0.2.1.7 1992/09/27 01:41:55 root
* Changed write() to do entire user buffer in one go, rather than just
* a kernel-buffer sized portion each time.
*
* Revision 0.2.1.6 1992/09/21 02:15:30 root
* Introduced udelay() function for microsecond-delays.
* Trying to use get_dma_residue rather than TC flags.
* Patch to fill entire user buffer on reads before
* returning.
*
* Revision 0.2.1.5 1992/09/19 02:31:28 root
* Some changes based on patches by Eddy Olk to
* support Archive SC402/SC499R controller cards.
*
* Revision 0.2.1.4 1992/09/07 01:37:37 root
* Minor changes
*
* Revision 0.2.1.3 1992/08/13 00:11:02 root
* Added some support for Archive SC402 and SC499 cards.
* (Untested.)
*
* Revision 0.2.1.2 1992/08/10 02:02:36 root
* Changed from linux/system.h macros to asm/dma.h inline functions.
*
* Revision 0.2.1.1 1992/08/08 01:12:39 root
* cleaned up a bit. added stuff for selftesting.
* preparing for asm/dma.h instead of linux/system.h
*
* Revision 0.2 1992/08/03 20:11:30 root
* Changed to use new IRQ allocation. Padding now done at runtime, pads to
* 512 bytes. Because of this the page regs must be re-programmed every
* block! Added hooks for selftest commands.
* Moved to linux-0.97.
*
* Revision 0.1.0.5 1992/06/22 22:20:30 root
* moved to Linux 0.96b
*
* Revision 0.1.0.4 1992/06/18 02:00:04 root
* Use minor bit-7 to enable/disable printing of extra debugging info
* when do tape access.
* Added semop stuff for DMA/IRQ allocation checking. Don't think this
* is the right way to do it though.
*
* Revision 0.1.0.3 1992/06/01 01:57:34 root
* changed DRQ to DMA. added TDEBUG ifdefs to reduce output.
*
* Revision 0.1.0.2 1992/05/31 14:02:38 root
* changed SET_DMA_PAGE handling slightly.
*
* Revision 0.1.0.1 1992/05/27 12:12:03 root
* Can now use multiple files on tape (sort of).
* First release.
*
* Revision 0.1 1992/05/26 01:16:31 root
* Initial version. Copyright H. H. Bergman 1992
*
*/
/* After the legalese, now the important bits:
*
* This is a driver for the Wangtek 5150 tape drive with
* a QIC-02 controller for ISA-PC type computers.
* Hopefully it will work with other QIC-02 tape drives as well.
*
* Make sure your setup matches the configuration parameters.
* Also, be careful to avoid IO conflicts with other devices!
*/
#include <linux/config.h>
/* skip this driver if not required for this configuration */
#if CONFIG_TAPE_QIC02
/*
#define TDEBUG
*/
#define REALLY_SLOW_IO /* it sure is ... */
#include <asm/dma.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/segment.h>
#include <linux/errno.h>
#include <linux/mtio.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/tpqic02.h>
/* check existence of required configuration parameters */
#if !defined(TAPE_QIC02_MAJOR) || !defined(TAPE_QIC02_PORT) || \
!defined(TAPE_QIC02_IRQ) || !defined(TAPE_QIC02_DMA)
#error tape_qic02 configuration error
#endif
#define TPQIC_NAME "tpqic02"
/* Linux outb() commands have (value,port) as parameters.
* One might expect (port,value) instead, so beware!
*/
static volatile int ctlbits = 0; /* control reg bits for tape interface */
static struct wait_queue *tape_qic02_transfer = NULL; /* sync rw with interrupts */
static volatile struct mtget ioctl_status; /* current generic status */
static volatile struct tpstatus tperror; /* last drive status */
static char rcs_revision[] = "$Revision: 0.2.1.21 $";
static char rcs_date[] = "$Date: 1993/06/18 19:04:33 $";
/* Flag bits for status and outstanding requests.
* (Could all be put in one bit-field-struct.)
* Some variables need `volatile' because they may be modified
* by an interrupt.
*/
static volatile flag status_dead = YES; /* device is legally dead until proven alive */
static flag status_open = NO; /* in use or not */
static volatile flag status_bytes_wr = NO; /* write FM at close or not */
static volatile flag status_bytes_rd = NO; /* (rd|wr) used for rewinding */
static volatile unsigned long status_cmd_pending = 0; /* cmd in progress */
static volatile flag status_expect_int = NO; /* ready for interrupts */
static volatile flag status_timer_on = NO; /* using time-out */
static volatile int status_error = 0; /* int handler may detect error */
static volatile flag status_eof_detected = NO; /* end of file */
static volatile flag status_eom_detected = NO; /* end of recorded media */
static volatile flag status_eot_detected = NO; /* end of tape */
static volatile flag doing_read = NO;
static volatile flag doing_write = NO;
static volatile unsigned long dma_bytes_todo;
static volatile unsigned long dma_bytes_done;
static volatile unsigned dma_mode = 0; /* !=0 also means DMA in use */
static flag need_rewind = YES;
static dev_t current_tape_dev = (TAPE_QIC02_MAJOR)<<8;
static int extra_blocks_left = BLOCKS_BEYOND_EW;
/* return_*_eof:
* NO: not at EOF,
* YES: tell app EOF was reached (return 0).
*
* return_*_eof==YES && reported_*_eof==NO ==>
* return current buffer, next time(s) return EOF.
*
* return_*_eof==YES && reported_*_eof==YES ==>
* at EOF and application knows it, so we can
* move on to the next file.
*
*/
static flag return_read_eof = NO; /* set to signal app EOF was reached */
static flag return_write_eof = NO;
static flag reported_read_eof = NO; /* set when we've done that */
static flag reported_write_eof = NO;
#ifdef TP_HAVE_SEEK
/* This is for doing `mt seek <blocknr>' */
static char seek_addr_buf[SEEK_BUF_SIZE];
#endif
/* In write mode, we have to write a File Mark after the last block written,
* when the tape device is closed. Tape repositioning and reading in write
* mode is allowed as long as no actual writing has been done. After writing
* the File Mark, repositioning and reading are allowed again.
*/
static int mode_access; /* access mode: READ or WRITE */
/* This is the actual kernel buffer where the interrupt routines read
* from/write to. It is needed because the DMA channels 1 and 3 cannot
* access the user buffers. [The kernel buffer must reside in the lower
* 1MBytes of system memory because of the DMA controller.]
* The user must ensure that a large enough buffer is passed to the
* kernel, in order to reduce tape repositioning.
*
* The buffer is 512 bytes larger than expected, because I want to align it
* at 512 bytes, to prevent problems with 64k boundaries.
*/
static volatile char tape_qic02_buf[TPQBUF_SIZE+TAPE_BLKSIZE];
/* A really good compiler would be able to align this at 512 bytes... :-( */
static unsigned long buffaddr; /* aligned physical address of buffer */
/* This translates minor numbers to the corresponding recording format: */
static char *format_names[] = {
"not set", /* for dumb drives unable to handle format selection */
"11", /* extinct */
"24",
"120",
"150",
"300", /* untested. */
"600" /* untested. */
};
/* `exception_list' is needed for exception status reporting.
* Exceptions 1..14 are defined by QIC-02 rev F.
* The drive status is matched sequentially to each entry,
* ignoring irrelevant bits, until a match is found. If no
* match is found, exception number 0 is used. (That should of
* course never happen...) The original table was based on the
* "Exception Status Summary" in QIC-02 rev F, but some changes
* were required to make it work with real-world drives.
*
* Exception 1 (CNI) is changed to also cover status 0x00e0 (mask USL),
* Exception 4 (EOM) is changed to also cover status 0x8288 (mask EOR),
* Exception 11 (FIL) is changed to also cover status 0x0089 (mask EOM).
* Exception 15 (EOR) is added for seek-to-end-of-data (catch EOR),
* Exception 16 (BOM) is added for beginning-of-media (catch BOM).
*/
static struct exception_list_type {
short mask, code;
char *msg;
} exception_list[] = {
{0, 0,
"Unknown exception status code", /* extra: 0 */},
{~(TP_WRP|TP_USL), TP_ST0|TP_CNI,
/* My Wangtek 5150EQ sometimes reports a status code
* of 0x00e0, which is not a valid exception code, but
* I think it should be recognized as "NO CARTRIDGE".
*/
"Cartridge not in place" /* 1 */},
{-1, TP_ST0|TP_CNI|TP_USL|TP_WRP,
"Drive not online" /* 2 */},
{~(TP_ST1|TP_BOM), TP_ST0|TP_WRP,
"Write protected cartridge" /* 3 */},
{~(TP_ST1|TP_EOR), TP_ST0|TP_EOM,
"End of media" /* 4 */},
{~TP_WRP, TP_ST0|TP_UDA| TP_ST1|TP_BOM,
"Read or Write abort. Rewind tape." /* 5 */},
{~TP_WRP, TP_ST0|TP_UDA,
"Read error. Bad block transferred." /* 6 */},
{~TP_WRP, TP_ST0|TP_UDA|TP_BNL,
"Read error. Filler block transferred." /* 7 */},
{~TP_WRP, TP_ST0|TP_UDA|TP_BNL |TP_ST1|TP_NDT,
"Read error. No data detected." /* 8 */},
{~TP_WRP, TP_ST0|TP_EOM|TP_UDA|TP_BNL |TP_ST1|TP_NDT,
"Read error. No data detected. EOM." /* 9 */},
{~(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 */},
{~(TP_WRP|TP_EOM), TP_ST0|TP_FIL,
/* Status 0x0089 (EOM & FM) is viewed as an FM,
* because it can only happen during a read.
* EOM is checked separately for an FM condition.
*/
"File mark detected" /* 11 */},
{~(TP_ST0|TP_CNI|TP_USL|TP_WRP|TP_BOM), TP_ST1|TP_ILL,
"Illegal command" /* 12 */},
{~(TP_ST0|TP_CNI|TP_USL|TP_WRP|TP_BOM), TP_ST1|TP_POR,
"Reset occurred" /* 13 */},
{~TP_WRP, TP_ST0|TP_FIL|TP_MBD, /* NOTE: ST1 not set! */
"Marginal block detected" /* 14 */},
{~(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 */},
/* 15 is returned when SEEKEOD completes successfully */
{~(TP_WRP|TP_ST0), TP_ST1|TP_BOM,
"Beginning of media" /* extra: 16 */}
#ifdef CYPHER_BUG
/* Perhaps the Cypher driver clears the TP_BOM bit after the
* status has been read? The QIC-02 specs explicitly state that
* the BOM bit should remain set as long as the tape is logically
* at the beginning of the tape.
*/
,{-1, TP_ST1,
"Hmm, this must be Cypher drive... Aaargh" /* extra */}
#endif
};
#define NR_OF_EXC (sizeof(exception_list)/sizeof(struct exception_list_type))
static void tpqputs(char *s)
{
printk(TPQIC_NAME ": %s\n", s);
} /* tpqputs */
/* Perform byte order swapping for a 16-bit word.
*
* [FIXME] This should probably be in include/asm/
* ([FIXME] i486 can do this faster)
*/
static inline void byte_swap_w(volatile unsigned short * w)
{
int t = *w;
*w = (t>>8) | ((t & 0xff)<<8);
}
/* Init control register bits on interface card.
* For Archive, interrupts must be enabled explicitly.
* Wangtek interface card requires ONLINE to be set, Archive SC402/SC499R
* cards keep it active all the time.
*/
static void ifc_init(void)
{
#if TAPE_QIC02_IFC == WANGTEK
ctlbits = WT_CTL_ONLINE; /* online */
outb_p(ctlbits, QIC_CTL_PORT);
#elif TAPE_QIC02_IFC == ARCHIVE
ctlbits = 0; /* no interrupts yet */
outb_p(ctlbits, QIC_CTL_PORT);
outb_p(0, AR_RESET_DMA_PORT); /* dummy write to reset DMA */
#else
# error No valid interface card specified
#endif
} /* ifc_init */
static void report_exception(unsigned n)
{
if (n >= NR_OF_EXC) { tpqputs("Oops -- report_exception"); n = 0; }
printk(TPQIC_NAME ": sense: %s\n", exception_list[n].msg);
} /* report_exception */
/* Try to map the drive-exception bits `s' to a predefined "exception number",
* by comparing the significant exception bits for each entry in the
* exception table (`exception_list[]').
* It is assumed that s!=0.
*/
static int decode_exception_nr(short s) /* s must be short, because of sign-extension */
{
int i;
for (i=1; i<NR_OF_EXC; i++) {
if ((s & exception_list[i].mask)==exception_list[i].code)
return i;
}
tpqputs("decode_exception_nr: exception not recognized");
return 0;
} /* decode_exception_nr */
#ifdef OBSOLETE
/* There are exactly 14 possible exceptions, as defined in QIC-02 rev F.
* Some are FATAL, some aren't. Currently all exceptions are treated as fatal.
* Especially 6 and 14 should not abort the transfer. RSN...
* Should probably let sense() figure out the exception number using the code
* below, and just report the error based on the number here, returning a code
* for FATAL/CONTINUABLE.
*/
static void report_error(int s)
{
short n = -1;
if (s & TP_ST1) {
if (s & TP_ILL) /* 12: Illegal command. FATAL */
n = 12;
if (s & TP_POR) /* 13: Reset occurred. FATAL */
n = 13;
}
else if (s & TP_ST0) {
if (s & TP_EOR) { /* extra: 15: End of Recorded Media. CONTINUABLE */
n = 15;
/********** should set flag here **********/
}
else if (s & TP_EOM) /* 4: End Of Media. CONTINUABLE */
n = 4;
else if (s & TP_USL) /* 2: Drive not online. FATAL */
n = 2;
else if (s & TP_CNI) { /* 1: Cartridge not in place. FATAL */
n = 1;
need_rewind = YES;
status_eof_detected = NO;
status_eom_detected = NO;
}
else if (s & TP_UDA) {
if (s & TP_BNL) {
if (s & TP_NDT) {
if (s & TP_BOM) /* 9: Read error. No data detected & EOM. CONTINUABLE */
n = 9;
else if (s & TP_EOM) /* 10: Read error. No data detected & BOM. CONTINUABLE */
n = 10;
else /* 8: Read error. No data detected. CONTINUABLE */
n = 8;
} else { /* 7: Read error. Cannot recover block, filler substituted. CONTINUABLE */
tpqputs("[Bad block -- filler data transferred.]");
n = 7;
}
}
else {
if (s & TP_EOM) /* 5: Read or Write error. Rewind tape. FATAL */
n = 5;
else { /* 6: Read error. Bad block transferred. CONTINUABLE */
/* block is bad, but transfer may continue.
* This is why some people prefer not to
* use compression on backups...
*/
tpqputs("[CRC failed!]");
n = 6;
}
}
}
else if (s & TP_FIL) {
if (s & TP_MBD) { /* 14: Marginal block detected. CONTINUABLE */
tpqputs("[Marginal block]");
n = 14;
} else /* 11: File mark detected. CONTINUABLE */
n = 11;
}
else if (s & TP_WRP) /* 3: Write protected cartridge. FATAL */
n = 3;
}
if (n >= 0)
sensemsg(n);
} /* report_error */
#endif
/* perform appropriate action for certain exceptions */
static void handle_exception(int exnr, int exbits)
{
if (exnr==EXC_NCART) {
/* Cartridge was changed. Redo sense().
* EXC_NCART should be handled in open().
* It is not permitted to remove the tape while
* the tape driver has open files.
*/
need_rewind = YES;
status_eof_detected = NO;
status_eom_detected = NO;
}
else if (exnr==EXC_XFILLER)
tpqputs("[Bad block -- filler data transferred.]");
else if (exnr==EXC_XBAD)
tpqputs("[CRC failed!]");
else if (exnr==EXC_MARGINAL) {
/* A marginal block behaves much like a FM.
* User may continue reading, if desired.
*/
tpqputs("[Marginal block]");
doing_read = NO;
} else if (exnr==EXC_FM)
doing_read = NO;
} /* handle_exception */
static inline int is_exception(void)
{
return (inb(QIC_STAT_PORT) & QIC_STAT_EXCEPTION) == 0;
} /* is_exception */
/* Reset the tape drive and controller.
* When reset fails, it marks the drive as dead and all
* requests (except reset) are to be ignored (ENXIO).
*/
static int tape_reset(int verbose)
{
ifc_init(); /* reset interface card */
outb_p(ctlbits | QIC_CTL_RESET, QIC_CTL_PORT); /* assert reset */
/* Next, we need to wait >=25 usec. */
udelay(30);
/* after reset, we will be at BOT (modulo an automatic rewind) */
status_eof_detected = NO;
status_eom_detected = NO;
status_cmd_pending = 0;
need_rewind = YES;
doing_read = doing_write = NO;
ioctl_status.mt_fileno = ioctl_status.mt_blkno = 0;
outb_p(ctlbits & ~QIC_CTL_RESET, QIC_CTL_PORT); /* de-assert reset */
status_dead = ((inb_p(QIC_STAT_PORT) & QIC_STAT_RESETMASK) != QIC_STAT_RESETVAL);
/* if successful, inb(STAT) returned RESETVAL */
if (status_dead)
printk(TPQIC_NAME ": reset failed!\n");
else if (verbose)
printk(TPQIC_NAME ": reset successful\n");
return (status_dead)? TE_DEAD : TE_OK;
} /* 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, QIC_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, QIC_CMD_PORT); /* output the command */
/* wait 1 usec before asserting /REQUEST */
udelay(1);
if ((!ignore_ex) && is_exception()) {
tpqputs("*** exception detected in notify_cmd");
/** force a reset here **/
if (tape_reset(1)==TE_DEAD)
return TE_DEAD;
if (is_exception()) {
tpqputs("exception persists after reset.");
tpqputs(" ^ exception ignored.");
}
}
outb_p(ctlbits | QIC_CTL_REQUEST, QIC_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(QIC_STAT_PORT) & QIC_STAT_READY) && (--i>0))
/*skip*/; /* wait for ready */
if (i==0) {
tpqputs("timed out waiting for ready in notify_cmd");
status_dead = YES;
return TE_TIM;
}
outb_p(ctlbits & ~QIC_CTL_REQUEST, QIC_CTL_PORT); /* reset request bit */
i = TAPE_NOTIFY_TIMEOUT;
/* according to the specs this one should never time-out */
while (((inb_p(QIC_STAT_PORT) & QIC_STAT_READY) == 0) && (--i>0))
/*skip*/; /* wait for not ready */
if (i==0) {
tpqputs("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;
time_t 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(QIC_STAT_PORT) & QIC_STAT_MASK) == QIC_STAT_MASK) && (--spin_t>0))
/*SKIP*/;
if ((stat & QIC_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;
while (((stat = inb_p(QIC_STAT_PORT) & QIC_STAT_MASK) == QIC_STAT_MASK) && (jiffies<spin_t))
schedule(); /* don't waste all the CPU time */
if ((stat & QIC_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(QIC_STAT_PORT) & QIC_STAT_MASK) == QIC_STAT_MASK) && (jiffies<spin_t)) {
/* be `nice` to other processes on long operations... */
current->timeout = jiffies + 30; /* nap 0.30 sec between checks, */
current->state = TASK_INTERRUPTIBLE;
schedule(); /* but could be woken up earlier by signals... */
}
/* don't use jiffies for this test because it may have changed by now */
if ((stat & QIC_STAT_MASK) == QIC_STAT_MASK) {
tpqputs("wait_for_ready() timed out");
return TE_TIM;
}
if ((stat & QIC_STAT_EXCEPTION) == 0) {
tpqputs("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(QIC_STAT_PORT);
if ((stat & QIC_STAT_EXCEPTION) == 0) { /* if exception */
tpqputs("send_qic02_cmd: Exception!");
return TE_EX;
}
if (stat & QIC_STAT_READY) { /* if not ready */
tpqputs("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 (cmd == 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("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 = 1000; /* 500 is not enough on a 486/33 */
while ((n>0) && ((inb_p(QIC_STAT_PORT) & QIC_STAT_MASK) == QIC_STAT_MASK))
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.]
*/
tpqputs("waiting looong in rdstatus() -- drive dead?");
while ((inb_p(QIC_STAT_PORT) & QIC_STAT_MASK) == QIC_STAT_MASK)
schedule();
tpqputs("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_tape_dev))
printk(TPQIC_NAME ": reading status bytes: ");
for (q=stp; q<stp+size; q++)
{
do s = inb_p(QIC_STAT_PORT);
while ((s & QIC_STAT_MASK) == QIC_STAT_MASK); /* wait for ready or exception */
if ((s & QIC_STAT_EXCEPTION) == 0) { /* if exception */
tpqputs("rdstatus: exception error");
ioctl_status.mt_erreg = 0; /* dunno... */
return TE_NS; /* error, shouldn't happen... */
}
*q = inb_p(QIC_DATA_PORT); /* read status byte */
if (TP_DIAGS(current_tape_dev))
printk("[%1d]=0x%x ", q-stp, (unsigned) (*q) & 0xff);
outb_p(ctlbits | QIC_CTL_REQUEST, QIC_CTL_PORT); /* set request */
while ((inb_p(QIC_STAT_PORT) & QIC_STAT_READY) == 0); /* wait for not ready */
udelay(22); /* delay >20 usec */
outb_p(ctlbits & ~QIC_CTL_REQUEST, QIC_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(QIC_STAT_PORT) & QIC_STAT_READY)
/*skip*/; /* wait for ready */
if (TP_DIAGS(current_tape_dev))
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(char *stp)
{
int stat = rdstatus(stp, TPSTATSIZE, QCMD_RD_STAT);
#if defined(i386) || defined(i486)
byte_swap_w(&tperror.dec);
byte_swap_w(&tperror.urc);
#else
/* should probably swap status bytes #definition */
#endif
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("Attempting to read Extended Status 3...");
stat = rdstatus(vus, sizeof(vus), QCMD_RD_STAT_X3);
if (stat != TE_OK)
return stat;
tpqputs("Returned status bytes:");
for (i=0; i<sizeof(vus); i++) {
if ( i % 8 == 0 )
printk("\n" TPQIC_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);
printk(TPQIC_NAME ": tp_sense(ignore=0x%x) enter\n", ignore);
/* sense() is not allowed during a read or write cycle */
if (doing_write == YES)
tpqputs("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((char *) &tperror) != TE_OK) {
tpqputs("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(TPQIC_NAME ": tp_sense: status: %x, error count: %d, underruns: %d\n",
tperror.exs, tperror.dec, tperror.urc);
else
printk(TPQIC_NAME ": tp_sense: no errors at all, 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!=0) {
exnr = decode_exception_nr(err);
handle_exception(exnr, err); /* update driver state wrt drive status */
report_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(QIC_STAT_PORT) & QIC_STAT_MASK;
printk(TPQIC_NAME ": Waiting for (re-)wind to finish: stat=0x%x\n", stat);
stat = wait_for_ready(timeout);
if (stat != TE_OK) {
tpqputs("(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) {
tpqputs("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(TPQIC_NAME ": ll_do_qic_cmd(%x, %d) failed\n", cmd, timeout);
return -EIO;
}
#if OBSOLETE
/* wait for ready since it may not be active immediately after reading status */
while ((inb_p(QIC_STAT_PORT) & QIC_STAT_READY) != 0);
#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(TPQIC_NAME ": Exception persist in ll_do_qic_cmd[1](%x, %d)", cmd, timeout);
status_dead = YES;
return -ENXIO;
/* if rdstatus fails too, we're in trouble */
}
}
else if (stat!=TE_OK) {
printk(TPQIC_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(TPQIC_NAME ": Exception persist in ll_do_qic_cmd[2](%x, %d)\n", cmd, 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(TPQIC_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) {
doing_read = NO;
if (cmd != QCMD_RD_FM) {
/* if the command is a RFM, there is no need to do this
* because a RFM will legally terminate the read-cycle.
*/
tpqputs("terminating pending read-cycle");
if (tp_sense(TP_FIL|TP_EOM|TP_WRP) != TE_OK) {
tpqputs("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("finish_rw[read2]: read cycle error");
}
}
}
}
} /* terminate_read */
static void terminate_write(int cmd)
{
int stat;
if (doing_write == YES) {
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("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("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("Rewinding tape...");
stat = ll_do_qic_cmd(QCMD_REWIND, TIM_R);
if (stat != 0) {
printk(TPQIC_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("MTFSF forward searching filemark");
if ((mode_access==WRITE) && status_bytes_wr)
return -EACCES;
return do_qic_cmd(QCMD_RD_FM, TIM_F);
case MTBSF:
#ifdef TP_HAVE_BSF
tpqputs("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
tpqputs("MTBSF not supported");
stat = -ENXIO;
#endif
status_eom_detected = status_eof_detected = NO;
return stat;
case MTFSR:
#ifdef TP_HAVE_FSR /* This is an optional QIC-02 command */
tpqputs("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("MTFSR not supported");
stat = -ENXIO;
#endif
return stat;
case MTBSR:
#ifdef TP_HAVE_BSR /* This is an optional QIC-02 command */
/* we need this for appending files with GNU tar!! */
tpqputs("MTFSR backward space record");
if ((mode_access==WRITE) && status_bytes_wr)
return -EACCES;
stat = do_qic_cmd(QCMD_SPACE_BCK, TIM_F);
#else
tpqputs("MTBSR not supported");
stat = -ENXIO;
#endif
status_eom_detected = status_eof_detected = NO;
return stat;
case MTWEOF:
tpqputs("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("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("MTOFFL rewinding & going offline"); /*---*/
/******* What exactly are we supposed to do, to take it 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("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("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("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("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("MTEOM search for End Of recorded Media");
if ((mode_access==WRITE) && status_bytes_wr)
return -EACCES;
#ifdef TP_HAVE_EOD
/* Use faster seeking when possible.
* This requires the absence of data beyond the EOM.
*/
# if TAPE_QIC02_DRIVE == MT_ISWT5150
/* 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;
# endif
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;
#endif
return stat;
case MTERASE:
tpqputs("MTERASE -- ERASE TAPE !");
if ((tperror.exs & TP_ST0) && (tperror.exs & TP_WRP)) {
tpqputs("Cartridge is write-protected.");
return -EACCES;
} else {
time_t t = jiffies;
/* give user a few seconds to pull out tape */
while (jiffies - t < 3*HZ)
schedule();
}
/* Plain GNU mt(1) 2.2 erases a tape in O_RDONLY. :-( */
if (mode_access==READ)
return -EACCES;
/* don't bother writing filemark */
status_eom_detected = status_eof_detected = NO;
return do_qic_cmd(QCMD_ERASE, TIM_R);
case MTRAS1:
#ifdef TP_HAVE_RAS1
tpqputs("MTRAS1: non-destructive self test");
stat = do_qic_cmd(QCMD_SELF_TST1, TIM_R);
if (stat != 0) {
tpqputs("RAS1 failed");
return stat;
}
return (tp_sense(0)==TE_OK)? 0 : -EIO; /* get_ext_status3(); */
#else
tpqputs("RAS1 not supported");
return -ENXIO;
#endif
case MTRAS2:
#ifdef TP_HAVE_RAS2
tpqputs("MTRAS2: destructive self test");
stat = do_qic_cmd(QCMD_SELF_TST2, TIM_R);
if (stat != 0) {
tpqputs("RAS2 failed");
return stat;
}
return (tp_sense(0)==TE_OK)? 0 : -EIO; /* get_ext_status3(); */
#else
tpqputs("RAS2 not supported");
return -ENXIO;
#endif
#ifdef TP_HAVE_SEEK
case MTSEEK:
tpqputs("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(QCMDV_SEEK_BLK, TIM_F);
#endif
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!)
* When other devices use DMA they must ensure they use un-interruptible
* double byte accesses to the DMA controller. Floppy.c is ok.
* Must have interrupts disabled when this function is invoked,
* otherwise, the double-byte transfers to the DMA controller will not
* be atomic. That could lead to nasty problems when they are interrupted
* by other DMA interrupt-routines.
*
* 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)
{
#if TAPE_QIC02_IFC == WANGTEK
outb_p(WT_CTL_ONLINE, QIC_CTL_PORT); /* back to normal */
#elif TAPE_QIC02_IFC == ARCHIVE
outb_p(0, AR_RESET_DMA_PORT);
#endif
clear_dma_ff(TAPE_QIC02_DMA);
set_dma_mode(TAPE_QIC02_DMA, dma_mode);
set_dma_addr(TAPE_QIC02_DMA, buffaddr+dma_bytes_done); /* full address */
set_dma_count(TAPE_QIC02_DMA, TAPE_BLKSIZE);
/* start tape DMA controller */
#if TAPE_QIC02_IFC == WANGTEK
outb_p(WT_CTL_DMA | WT_CTL_ONLINE, QIC_CTL_PORT); /* trigger DMA transfer */
#elif TAPE_QIC02_IFC == ARCHIVE
outb_p(AR_CTL_IEN | AR_CTL_DNIEN, QIC_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. */
#endif
/* start computer DMA controller */
enable_dma(TAPE_QIC02_DMA);
/* 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 tape_qic02_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("start_dma() enter");
TPQDEB({printk(TPQIC_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((char *) &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;
#if OBSOLETE
/************* not needed iff rd_status() would wait for ready!!!!!! **********/
if (wait_for_ready(TIM_S) != TE_OK) { /*** not sure this is needed ***/
tpqputs("wait_for_ready failed in start_dma");
return -EIO;
}
#endif
/* 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(TPQIC_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(TPQIC_NAME ": requested unknown mode %d\n", mode);
panic(TPQIC_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("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 */
cli();
dma_transfer();
sti();
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;
TIMEROFF;
TPQPUTS("end_dma() enter");
disable_dma(TAPE_QIC02_DMA);
clear_dma_ff(TAPE_QIC02_DMA);
#if TAPE_QIC02_IFC == WANGTEK
outb_p(WT_CTL_ONLINE, QIC_CTL_PORT); /* back to normal */
#elif TAPE_QIC02_IFC == ARCHIVE
outb_p(0, AR_RESET_DMA_PORT);
#endif
stat = wait_for_ready(TIM_M);
if (status_error || (stat!=TE_OK)) {
tpqputs("DMA transfer exception");
stat = tp_sense((dma_mode==READ)? TP_WRP : 0);
/* no return here -- got to clean up first! */
}
/* 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 ***********/
/* tape_qic02_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 tape_qic02_times_out(void)
{
printk("time-out in %s driver\n", TPQIC_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(&tape_qic02_transfer);
}
}
} /* tape_qic02_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???????]
*/
/* tape_qic02_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 void tape_qic02_interrupt(int unused)
{
int stat, r, i;
TIMEROFF;
if (status_expect_int) {
if (TP_DIAGS(current_tape_dev))
printk("@");
stat = inb(QIC_STAT_PORT); /* Knock, knock */
#if TAPE_QIC02_IFC == ARCHIVE /* "Who's there?" */
if (((stat & (AR_STAT_DMADONE)) == 0) &&
((stat & (QIC_STAT_EXCEPTION)) != 0)) {
TIMERCONT;
return; /* "Linux with IRQ sharing" */
}
#endif
if ((stat & QIC_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("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(&tape_qic02_transfer);
return;
}
/* 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 TAPE_QIC02_IFC != ARCHIVE /* I think this is a drive-dependency, not IFC -- hhb */
if (stat & QIC_STAT_READY) { /* not ready */
tpqputs("isr: ? Tape controller not ready");
r = 1;
}
#endif
if ( (i = get_dma_residue(TAPE_QIC02_DMA)) != 0 ) {
printk(TPQIC_NAME ": dma_residue == %x !!!\n", i);
r = 1; /* big trouble, but can't do much about it... */
}
if (r)
return;
/* 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(&tape_qic02_transfer);
} else {
/* start next transfer, account for track-switching time */
timer_table[TAPE_QIC02_TIMER].expires = jiffies + 6*HZ;
dma_transfer();
}
} else {
printk(TPQIC_NAME ": Unexpected interrupt, stat == %x\n",
inb(QIC_STAT_PORT));
}
} /* tape_qic02_interrupt */
static int tape_qic02_lseek(struct inode * inode, struct file * file, off_t offset, int origin)
{
return -EINVAL; /* not supported */
} /* tape_qic02_lseek */
/* 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 int tape_qic02_read(struct inode * inode, struct file * filp, char * buf, int count)
{
int error;
dev_t dev = inode->i_rdev;
unsigned short flags = filp->f_flags;
unsigned long bytes_todo, bytes_done, total_bytes_done = 0;
int stat;
if (TP_DIAGS(current_tape_dev))
printk(TPQIC_NAME ": request READ, minor=%x, buf=%lx, count=%x, pos=%x, flags=%x\n",
MINOR(dev), buf, count, filp->f_pos, flags);
if (count % TAPE_BLKSIZE) { /* Only allow mod 512 bytes at a time. */
tpqputs("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;
/* Make sure buffer is safe to write into. */
error = verify_area(VERIFY_WRITE, buf, count);
if (error) {
printk(TPQIC_NAME ": read: verify_area(WRITE, %lx, %x) failed\n", buf, count);
return error;
}
/* This is rather ugly because it has to implement a finite state
* machine in order to handle the EOF situations properly.
*/
while (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) {
printk("read: return_read_eof==%d, reported_read_eof==%d, total_bytes_done==%d\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("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 */
while (dma_mode != 0) {
sleep_on(&tape_qic02_transfer);
}
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("read: Oops, read more bytes than requested");
return -EIO;
}
/* copy buffer to user-space in one go */
if (bytes_done>0)
memcpy_tofs( (void *) buf, (void *) buffaddr, bytes_done);
#if 1
/* Checks Ton's patch below */
if ((return_read_eof == NO) && (status_eof_detected == YES)) {
printk(TPQIC_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;
filp->f_pos += bytes_done;
total_bytes_done += bytes_done;
count -= bytes_done;
}
}
tpqputs("read request for <0 bytes");
return -EINVAL;
} /* tape_qic02_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 int tape_qic02_write(struct inode * inode, struct file * filp, char * buf, int count)
{
int error;
dev_t dev = inode->i_rdev;
unsigned short flags = filp->f_flags;
unsigned long bytes_todo, bytes_done, total_bytes_done = 0;
if (TP_DIAGS(current_tape_dev))
printk(TPQIC_NAME ": request WRITE, minor=%x, buf=%lx, count=%x, pos=%x, flags=%x\n",
MINOR(dev), buf, count, filp->f_pos, flags);
if (count % TAPE_BLKSIZE) { /* only allow mod 512 bytes at a time */
tpqputs("Wrong block size");
return -EINVAL;
}
if (mode_access==READ) {
tpqputs("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("Cartridge is write-protected.");
return -EACCES; /* don't even try when write protected */
}
/* Make sure buffer is safe to read from. */
error = verify_area(VERIFY_READ, buf, count);
if (error) {
printk(TPQIC_NAME ": write: verify_area(READ, %lx, %x) failed\n", buf, count);
return error;
}
if (doing_read == YES)
terminate_read(0);
while (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("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) {
memcpy_fromfs( (void *) buffaddr, (void *) buf, bytes_todo);
/****************** 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("write: start_dma() failed");
/* should do sense() on error here */
return -ENXIO; /*********** FIXTHIS **************/
}
/* Wait for write to complete, interrupt should wake us. */
while ((status_error == 0) && (dma_mode != 0)) {
sleep_on(&tape_qic02_transfer);
}
end_dma(&bytes_done);
if (bytes_done>bytes_todo) {
tpqputs("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("write: EW detected");
return_write_eof = YES;
} else {
/* probably EXC_RWA */
tpqputs("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;
filp->f_pos += bytes_done;
total_bytes_done += bytes_done;
count -= bytes_done;
}
}
tpqputs("write request for <0 bytes");
printk(TPQIC_NAME ": status_bytes_wr %x, buf %x, total_bytes_done %x, count %x\n", status_bytes_wr, buf, total_bytes_done, count);
return -EINVAL;
} /* tape_qic02_write */
/* tape_qic02_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 tape_qic02_open(struct inode * inode, struct file * filp)
{
dev_t dev = inode->i_rdev;
unsigned short flags = filp->f_flags;
unsigned short dens;
int s;
status_open = NO;
if (TP_DIAGS(dev)) {
printk("tape_qic02_open: dev=%x, flags=%x ", dev, flags);
}
if (MINOR(dev)==255) /* special case for resetting */
if (suser())
return (tape_reset(1)==TE_OK) ? -EAGAIN : -ENXIO;
else
return -EPERM;
if (status_open==YES) {
return -EBUSY; /* only one at a time... */
}
status_open = YES;
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). */
if (is_exception()) {
s = tp_sense(TP_WRP|TP_EOM|TP_BOM|TP_CNI|TP_EOR);
if (s != TE_OK) {
status_open = NO;
tpqputs("open: sense() failed after exception was detected");
return -EIO;
}
}
/* not allowed to do QCMD_DENS_* unless tape is rewound */
if ((TP_DENS(dev)!=0) && (TP_DENS(current_tape_dev) != TP_DENS(dev))) {
/* force rewind if minor bits have changed,
* i.e. user wants to use tape in different format.
* [assuming single drive operation]
*/
tpqputs("Density minor bits have changed. Forcing rewind.");
need_rewind = YES;
} else {
/* density bits still the same, but TP_DIAGS bit
* may have changed.
*/
current_tape_dev = dev;
}
if (need_rewind == YES) {
s = do_qic_cmd(QCMD_REWIND, TIM_R);
if (s != 0) {
tpqputs("open: rewind failed");
status_open = NO;
return -EIO;
}
}
/* Note: After a reset command, the controller will rewind the tape
* just before performing any tape movement operation!
*/
if (status_dead) {
tpqputs("open: tape dead, attempting reset");
if (tape_reset(1)!=TE_OK) {
status_open = NO;
return -ENXIO;
} else {
status_dead = NO;
if (tp_sense(~(TP_ST1|TP_ILL)) != TE_OK) {
tpqputs("open: tp_sense() failed\n");
status_dead = YES; /* try reset next time */
status_open = NO;
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_tape_dev) == TP_DENS(dev) )
return 0;
current_tape_dev = dev;
need_rewind = NO;
dens = TP_DENS(dev);
if (dens < sizeof(format_names)/sizeof(char *))
printk(TPQIC_NAME ": format: %s%s\n", (dens!=0)? "QIC-" : "", format_names[dens]);
else
tpqputs("Wait for retensioning...");
switch (TP_DENS(dev)) {
case 0: /* This one's for Eddy ;-) */
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_open = NO; /* fail if fault occurred */
status_dead = YES; /* force reset */
current_tape_dev = 0xff80;
return -EIO;
}
return 0;
} /* tape_qic02_open */
static int tape_qic02_readdir(struct inode * inode, struct file * filp, struct dirent * dp, int count)
{
return -ENOTDIR; /* not supported */
} /* tape_qic02_readdir */
static void tape_qic02_release(struct inode * inode, struct file * filp)
{
dev_t dev = inode->i_rdev;
if (TP_DIAGS(dev))
printk("tape_qic02_release: dev=%x\n", dev);
/* 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("release: device dead!?");
if (status_open==NO) {
tpqputs("release: device not open");
return;
}
/* Rewind only if minor number requires it AND
* read/writes have been done.
*/
if ((TP_REWCLOSE(dev)) && (status_bytes_rd | status_bytes_wr)) {
tpqputs("release: Doing rewind...");
(void) do_qic_cmd(QCMD_REWIND, TIM_R);
}
status_open = NO;
return;
} /* tape_qic02_release */
/* ioctl allows user programs to rewind the tape and stuff like that */
static int tape_qic02_ioctl(struct inode * inode, struct file * filp,
unsigned int iocmd, unsigned long ioarg)
{
int error;
short i;
int dev_maj = MAJOR(inode->i_rdev);
int c;
struct mtop operation;
char *stp, *argp;
#ifdef TP_HAVE_TELL
unsigned char blk_addr[6];
struct mtpos ioctl_tell;
#endif
if (TP_DIAGS(current_tape_dev))
printk(TPQIC_NAME ": ioctl(%4x, %4x, %4x)\n", dev_maj, iocmd, ioarg);
if (!inode || !ioarg)
return -EINVAL;
/* check iocmd first */
if (dev_maj != TAPE_QIC02_MAJOR) {
printk(TPQIC_NAME ": Oops! Wrong device?\n");
/* A panic() would be appropriate here */
return -ENODEV;
}
c = iocmd & IOCCMD_MASK;
if (c == (MTIOCTOP & IOCCMD_MASK)) {
/* Compare expected struct size and actual struct size. This
* is useful to catch programs compiled with old #includes.
*/
if (((iocmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT) != sizeof(struct mtop)) {
tpqputs("sizeof(struct mtop) does not match!");
return -EFAULT;
}
error = verify_area(VERIFY_READ, (char *) ioarg, sizeof(operation));
if (error)
return error;
/* copy mtop struct from user space to kernel space */
stp = (char *) &operation;
argp = (char *) ioarg;
for (i=0; i<sizeof(operation); i++)
*stp++ = get_fs_byte(argp++);
/* ---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_tape_dev))
printk("OP op=%4x, count=%4x\n", operation.mt_op, operation.mt_count);
if (operation.mt_count < 0)
tpqputs("Warning: negative mt_count ignored");
ioctl_status.mt_resid = operation.mt_count;
if (operation.mt_op == MTSEEK) {
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 == (MTIOCGET & IOCCMD_MASK)) {
if (TP_DIAGS(current_tape_dev))
printk("GET ");
/* compare expected struct size and actual struct size */
if (((iocmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT) != sizeof(struct mtget)) {
tpqputs("sizeof(struct mtget) does not match!");
return -EFAULT;
}
/* check for valid user address */
error = verify_area(VERIFY_WRITE, (void *) ioarg, sizeof(ioctl_status));
if (error)
return error;
/* 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 */
stp = (char *) &ioctl_status;
argp = (char *) ioarg;
for (i=0; i<sizeof(ioctl_status); i++)
put_fs_byte(*stp++, argp++);
return 0;
#ifdef TP_HAVE_TELL
} else if (c == (MTIOCPOS & IOCCMD_MASK)) {
if (TP_DIAGS(current_tape_dev))
printk("POS ");
/* compare expected struct size and actual struct size */
if (((iocmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT) != sizeof(struct mtpos)) {
tpqputs("sizeof(struct mtpos) does not match!");
return -EFAULT;
}
/* check for valid user address */
error = verify_area(VERIFY_WRITE, (void *) ioarg, sizeof(ioctl_tell));
if (error)
return error;
tpqputs("MTTELL reading block address");
if ((doing_read==YES) || (doing_write==YES))
finish_rw(QCMDV_TELL_BLK);
c = rdstatus((char *) blk_addr, sizeof(blk_addr), 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 */
stp = (char *) &ioctl_tell;
argp = (char *) ioarg;
for (i=0; i<sizeof(ioctl_tell); i++)
put_fs_byte(*stp++, argp++);
return 0;
#endif
} else
return -ENOTTY; /* Other cmds not supported. */
} /* tape_qic02_ioctl */
/* These are (most) of the interface functions: */
static struct file_operations tape_qic02_fops = {
tape_qic02_lseek, /* not allowed */
tape_qic02_read, /* read */
tape_qic02_write, /* write */
tape_qic02_readdir, /* not allowed */
NULL, /* select ??? */
tape_qic02_ioctl, /* ioctl */
NULL, /* mmap not allowed */
tape_qic02_open, /* open */
tape_qic02_release, /* release */
NULL /* fsync */
};
/* Attribute `SA_INTERRUPT' makes the interrupt atomic with
* interrupts disabled. We could do without the atomic stuff, but
* then dma_transfer() would have to disable interrupts explicitly.
* System load is high enough as it is :-(
*/
static struct sigaction tape_qic02_sigaction = {
tape_qic02_interrupt,
0,
SA_INTERRUPT,
NULL
};
/* align `a' at `size' bytes. `size' must be a power of 2 */
static inline unsigned long const align_buffer(unsigned long a, unsigned size)
{
if (a & (size-1)) /* if not aligned */
return (a | (size-1)) + 1;
else /* else is aligned */
return a;
}
/* init() is called from chr_dev_init() in kernel/chr_drv/mem.c */
long tape_qic02_init(long kmem_start)
/* Shouldn't this be a caddr_t ? */
{
printk(TPQIC_NAME ": IRQ %d, DMA %d, IO %xh, IFC %s, %s, %s\n",
TAPE_QIC02_IRQ, TAPE_QIC02_DMA, TAPE_QIC02_PORT,
#if TAPE_QIC02_IFC == WANGTEK
"Wangtek",
#elif TAPE_QIC02_IFC == ARCHIVE
"Archive",
#else
# error
#endif
rcs_revision, rcs_date);
/* First perform some checks. If one of them fails,
* the tape driver will not be registered to the system.
*/
/* Should do IRQ/DMA allocation in open(). Use free_irq() in release()
* return -EBUSY, if allocation fails in open().
* Make IRQ settable/readable through ioctls. DMA is trickier because
* some bits change for different DMA numbers. Also, this would add
* runtime overhead for having the dma channel number be a variable
* rather than a constant. Probably need to make the DMA stuff #ifdef'd
* to choose between hardcoded and changeable DMA channel.
*
* Also, Linux needs a more generic way to set DMA/IRQ and other stuff.
* Right now, this is done differently for every device. (setserial,
* ctrlaltdel, setdfprm, setfdthr, tunelp, ((setterm))...)
*
* #include <hint.h>
*/
/* get IRQ */
if (irqaction(TAPE_QIC02_IRQ, &tape_qic02_sigaction)) {
printk(TPQIC_NAME ": can't allocate IRQ%d for QIC-02 tape\n",
TAPE_QIC02_IRQ);
return kmem_start;
}
/* After IRQ, allocate DMA channel */
if (request_dma(TAPE_QIC02_DMA)) {
printk(TPQIC_NAME ": can't allocate DMA%d for QIC-02 tape\n",
TAPE_QIC02_DMA);
free_irq(TAPE_QIC02_IRQ);
return kmem_start;
}
if (TPSTATSIZE != 6) {
printk(TPQIC_NAME ": internal error: tpstatus struct incorrect!\n");
return kmem_start;
}
if ((TPQBUF_SIZE<512) || (TPQBUF_SIZE>=0x10000)) {
printk(TPQIC_NAME ": internal error: DMA buffer size out of range\n");
return kmem_start;
}
printk(TPQIC_NAME ": DMA buffers: %u blocks", NR_BLK_BUF);
/* Setup the page-address for the dma transfer.
* This assumes a one-to-one identity mapping between
* kernel addresses and physical memory.
*/
buffaddr = align_buffer((unsigned long) &tape_qic02_buf, TAPE_BLKSIZE);
printk(", at address 0x%lx (0x%lx)\n", buffaddr, (unsigned long) &tape_qic02_buf);
#ifndef CONFIG_MAX_16M
if (buffaddr+TPQBUF_SIZE>=0x1000000) {
printk(TPQIC_NAME ": DMA buffer *must* be in lower 16MB\n");
return kmem_start;
}
#endif
/* If we got this far, install driver functions */
if (register_chrdev(TAPE_QIC02_MAJOR, TPQIC_NAME, &tape_qic02_fops)) {
printk(TPQIC_NAME ": Unable to get chrdev major %d\n", TAPE_QIC02_MAJOR);
return kmem_start;
}
/* prepare timer */
TIMEROFF;
timer_table[TAPE_QIC02_TIMER].expires = 0;
timer_table[TAPE_QIC02_TIMER].fn = tape_qic02_times_out;
if (tape_reset(0)!=TE_OK || tp_sense(TP_WRP|TP_POR|TP_CNI)!=TE_OK) {
status_dead = YES;
} else {
if (is_exception()) {
tpqputs("exception detected\n");
(void) tp_sense(TP_WRP|TP_POR|TP_CNI);
}
}
/* initialize generic status for ioctl requests */
ioctl_status.mt_type = TAPE_QIC02_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 kmem_start;
} /* tape_qic02_init */
#endif /* CONFIG_TAPE_QIC02 */