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2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 | /* $Id: tpqic02.c,v 1.10 1997/01/26 07:13:20 davem Exp $ * * Driver for tape drive support for Linux-i386 * * Copyright (c) 1992--1996 by H. H. Bergman. All rights reserved. * Current e-mail address: hennus@cybercomm.nl * * 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. * * If you make changes to my code and redistribute it in source or binary * form you must make it clear to even casual users of your code that you * have modified my code, clearly point out what the changes exactly are * (preferably in the form of a context diff file), how to undo your changes, * where the original can be obtained, and that complaints/requests about the * modified code should be directed to you instead of me. * * 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. * * 1996/10/10 Emerald changes * * 1996/05/21 Misc changes+merges+cleanups + I/O reservations * * 1996/05/20 Module support patches submitted by Brian McCauley. * * 1994/05/03 Initial attempt at Mountain support for the Mountain 7150. * Based on patches provided by Erik Jacobson. Still incomplete, I suppose. * * 1994/02/07 Archive changes & some cleanups by Eddy Olk. * * 1994/01/19 Speed measuring stuff moved from aperf.h to delay.h. * BogoMips (tm) introduced by Linus. * * 1993/01/25 Kernel udelay. Eof fixups. * * 1992/09/19 Some changes based on patches by Eddy Olk to support * Archive SC402/SC499R controller cards. * * 1992/05/27 First release. * * 1992/05/26 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! */ /* #define TDEBUG */ #define REALLY_SLOW_IO /* it sure is ... */ #include <linux/module.h> #include <linux/config.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/fs.h> #include <linux/kernel.h> #include <linux/major.h> #include <linux/errno.h> #include <linux/mtio.h> #include <linux/fcntl.h> #include <linux/delay.h> #include <linux/ioport.h> #include <linux/tpqic02.h> #include <linux/mm.h> #include <linux/malloc.h> #include <linux/init.h> #include <asm/dma.h> #include <asm/system.h> #include <asm/io.h> #include <asm/uaccess.h> /* check existence of required configuration parameters */ #if !defined(QIC02_CMD_PORT) || !defined(QIC02_TAPE_IRQ) || !defined(QIC02_TAPE_DMA) # error qic02_tape configuration error #endif #define TPQIC02_NAME "tpqic02" /* Linux outb() commands have (value,port) as parameters. * One might expect (port,value) instead, so beware! */ #ifdef CONFIG_QIC02_DYNCONF /* This holds the dynamic configuration info for the interface * card+drive info if runtime configuration has been selected. */ static struct mtconfiginfo qic02_tape_dynconf = /* user settable */ { 0, 0, BOGUS_IRQ, 0, 0, TPQD_DEFAULT_FLAGS, }; static struct qic02_ccb qic02_tape_ccb = { 0, }; /* private stuff */ #else unsigned long qic02_tape_debug = TPQD_DEFAULT_FLAGS; # if ((QIC02_TAPE_IFC!=WANGTEK) && (QIC02_TAPE_IFC!=ARCHIVE) && (QIC02_TAPE_IFC!=MOUNTAIN)) # error No valid interface card specified # endif #endif /* CONFIG_QIC02_DYNCONF */ static volatile int ctlbits = 0; /* control reg bits for tape interface */ static struct wait_queue *qic02_tape_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: 1.10 $"; static char rcs_date[] = "$Date: 1997/01/26 07:13:20 $"; /* 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_zombie = YES; /* it's `zombie' until irq/dma allocated */ 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 kdev_t current_tape_dev; 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; /* This is for doing `mt seek <blocknr>' */ static char seek_addr_buf[AR_SEEK_BUF_SIZE]; /* 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 */ static int qic02_get_resources(void); static void qic02_release_resources(void); /* This is a pointer to the actual kernel buffer where the interrupt routines * read from/write to. It is needed because the DMA channels 1 and 3 cannot * always access the user buffers. [The kernel buffer must reside in the * lower 16MBytes 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 wear and tear. */ static unsigned long buffaddr = 0; /* physical address of buffer */ /* This translates minor numbers to the corresponding recording format: */ static const 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 2 (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). * * Had to swap EXC_NDRV and EXC_NCART to ensure that extended EXC_NCART * (because of the incorrect Wangtek status code) doesn't catch the * EXC_NDRV first. */ static struct exception_list_type { unsigned short mask, code; const char *msg; /* EXC_nr attribute should match with tpqic02.h */ } exception_list[] = { {0, 0, "Unknown exception status code", /* extra: 0 */}, {~(0), TP_ST0|TP_CNI|TP_USL|TP_WRP, "Drive not online" /* 1 */}, /* Drive presence goes before cartridge presence. */ {~(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" /* 2 */}, {(unsigned short) ~(TP_ST1|TP_BOM), (TP_ST0|TP_WRP), "Write protected cartridge" /* 3 */}, {(unsigned short) ~(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 */} }; #define NR_OF_EXC (sizeof(exception_list)/sizeof(struct exception_list_type)) /* Compare expected struct size and actual struct size. This * is useful to catch programs compiled with old #includes. */ #define CHECK_IOC_SIZE(structure) \ if (_IOC_SIZE(iocmd) != sizeof(struct structure)) { \ tpqputs(TPQD_ALWAYS, "sizeof(struct " #structure \ ") does not match!"); \ return -EFAULT; \ } \ static void tpqputs(unsigned long flags, const char *s) { if ((flags & TPQD_ALWAYS) || (flags & QIC02_TAPE_DEBUG)) printk(TPQIC02_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 (QIC02_TAPE_IFC == WANGTEK) /* || (QIC02_TAPE_IFC == EVEREX) */ { ctlbits = WT_CTL_ONLINE; /* online */ outb_p(ctlbits, QIC02_CTL_PORT); } else if (QIC02_TAPE_IFC == ARCHIVE) { ctlbits = 0; /* no interrupts yet */ outb_p(ctlbits, QIC02_CTL_PORT); outb_p(0, AR_RESET_DMA_PORT); /* dummy write to reset DMA */ } else /* MOUNTAIN */ { ctlbits = MTN_CTL_ONLINE; /* online, and logic enabled */ outb_p(ctlbits, QIC02_CTL_PORT); } } /* ifc_init */ static void report_qic_exception(unsigned n) { if (n >= NR_OF_EXC) { tpqputs(TPQD_ALWAYS, "Oops -- report_qic_exception"); n = 0; } if (TPQDBG(SENSE_TEXT) || n==0) { printk(TPQIC02_NAME ": sense: %s\n", exception_list[n].msg); } } /* report_qic_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_qic_exception_nr(unsigned s) { int i; for (i=1; i<NR_OF_EXC; i++) { if ((s & exception_list[i].mask)==exception_list[i].code) { return i; } } printk(TPQIC02_NAME ": decode_qic_exception_nr: exception(%x) not recognized\n", s); return 0; } /* decode_qic_exception_nr */ /* Perform appropriate action for certain exceptions. * should return a value to indicate stop/continue (in case of bad blocks) */ static void handle_qic_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(TPQD_ALWAYS, "[Bad block -- filler data transferred.]"); } else if (exnr==EXC_XBAD) { tpqputs(TPQD_ALWAYS, "[CRC failed!]"); } else if (exnr==EXC_MARGINAL) { /* A marginal block behaves much like a FM. * User may continue reading, if desired. */ tpqputs(TPQD_ALWAYS, "[Marginal block]"); doing_read = NO; } else if (exnr==EXC_FM) { doing_read = NO; } } /* handle_qic_exception */ static inline int is_exception(void) { return (inb(QIC02_STAT_PORT) & QIC02_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 */ /* assert reset */ if (QIC02_TAPE_IFC == MOUNTAIN) { outb_p(ctlbits & ~MTN_QIC02_CTL_RESET_NOT, QIC02_CTL_PORT); } else /* WANGTEK, ARCHIVE */ { outb_p(ctlbits | QIC02_CTL_RESET, QIC02_CTL_PORT); } /* 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; /* de-assert reset */ if (QIC02_TAPE_IFC == MOUNTAIN) { outb_p(ctlbits | MTN_QIC02_CTL_RESET_NOT, QIC02_CTL_PORT); } else { outb_p(ctlbits & ~QIC02_CTL_RESET, QIC02_CTL_PORT); } /* KLUDGE FOR G++ BUG */ { int stat = inb_p(QIC02_STAT_PORT); status_dead = ((stat & QIC02_STAT_RESETMASK) != QIC02_STAT_RESETVAL); } /* if successful, inb(STAT) returned RESETVAL */ if (status_dead == YES) { printk(TPQIC02_NAME ": reset failed!\n"); } else if (verbose) { printk(TPQIC02_NAME ": reset successful\n"); } return (status_dead == YES)? 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, 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)) /*skip*/; /* 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)) /*skip*/; /* 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; 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(QIC02_STAT_PORT) & QIC02_STAT_MASK) == QIC02_STAT_MASK) && (--spin_t>0)) /*SKIP*/; 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; while (((stat = inb_p(QIC02_STAT_PORT) & QIC02_STAT_MASK) == QIC02_STAT_MASK) && time_before(jiffies, spin_t)) schedule(); /* 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... */ current->state = TASK_INTERRUPTIBLE; /* nap 0.30 sec between checks, */ /* but could be woken up earlier by signals... */ schedule_timeout(3*HZ/10); } /* 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 = 1000; /* 500 is not enough on a 486/33 */ while ((n>0) && ((inb_p(QIC02_STAT_PORT) & QIC02_STAT_MASK) == QIC02_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(TPQD_ALWAYS, "waiting looong in rdstatus() -- drive dead?"); while ((inb_p(QIC02_STAT_PORT) & QIC02_STAT_MASK) == QIC02_STAT_MASK) schedule(); 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_tape_dev)) 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_tape_dev)) printk("[%1d]=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); /* 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) /*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(volatile struct tpstatus *stp) { int stat = rdstatus((char *) stp, TPSTATSIZE, QCMD_RD_STAT); #if defined(i386) || defined(i486) byte_swap_w(&(stp->dec)); byte_swap_w(&(stp->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(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; } #if OBSOLETE /* wait for ready since it may not be active immediately after reading status */ while ((inb_p(QIC02_STAT_PORT) & QIC02_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(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) { 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(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) { 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; /* 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!) * 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) { 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, buffaddr+dma_bytes_done); /* full address */ 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; unsigned long flags; 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; #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(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 */ save_flags(flags); cli(); dma_transfer(); restore_flags(flags); 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(void) { 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 void 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_tape_dev)) 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; /* "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; } /* 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; /* 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 */ timer_table[QIC02_TAPE_TIMER].expires = jiffies + 6*HZ; dma_transfer(); } } else { printk(TPQIC02_NAME ": Unexpected interrupt, stat == %x\n", inb(QIC02_STAT_PORT)); } } /* qic02_tape_interrupt */ static long long qic02_tape_lseek(struct file * file, long long offset, int origin) { return -EINVAL; /* not supported */ } /* qic02_tape_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 ssize_t qic02_tape_read(struct file * filp, char * buf, size_t count, loff_t *ppos) { int err; kdev_t dev = filp->f_dentry->d_inode->i_rdev; 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_tape_dev)) /* can't print a ``long long'' (for filp->f_pos), so chop it */ printk(TPQIC02_NAME ": request READ, minor=%x, buf=%p, count=%lx" ", pos=%lx, flags=%x\n", MINOR(dev), buf, (long) count, (unsigned long) 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 */ while (dma_mode != 0) { sleep_on(&qic02_tape_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(TPQD_ALWAYS, "read: Oops, read more bytes than requested"); return -EIO; } /* copy buffer to user-space in one go */ if (bytes_done>0) { err = copy_to_user( (void *) buf, (void *) bus_to_virt(buffaddr), bytes_done); if (err) { 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 * buf, size_t count, loff_t *ppos) { int err; kdev_t dev = filp->f_dentry->d_inode->i_rdev; 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_tape_dev)) { /* can't print a ``long long'' (for filp->f_pos), so chop it */ printk(TPQIC02_NAME ": request WRITE, minor=%x, buf=%p" ", count=%lx, pos=%lx, flags=%x\n", MINOR(dev), buf, (long) count, (unsigned long) 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) { err = copy_from_user( (void *) bus_to_virt(buffaddr), (const void *) buf, bytes_todo); if (err) { 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. */ while ((status_error == 0) && (dma_mode != 0)) { sleep_on(&qic02_tape_transfer); } 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); if (!open_error) { MOD_INC_USE_COUNT; } return open_error; } static int qic02_tape_open_no_use_count(struct inode * inode, struct file * filp) { kdev_t dev = inode->i_rdev; unsigned short flags = filp->f_flags; unsigned short dens = 0; int s; if (TP_DIAGS(dev)) { printk("qic02_tape_open: dev=%s, flags=%x ", kdevname(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_dead==YES) { /* Allow `mt reset' ioctl() even when already open()ed. */ return 0; } /* Only one at a time from here on... */ if (filp->f_count>1) /* filp->f_count==1 for the first 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"); 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."); 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(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] */ 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_tape_dev = dev; } 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_tape_dev) == TP_DENS(dev) ) { return 0; } current_tape_dev = dev; need_rewind = NO; if (TP_HAVE_DENS) { dens = TP_DENS(dev); } 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(dev)) { 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_tape_dev = 0; /* earlier 0xff80 */ return -EIO; } return 0; } /* qic02_tape_open */ static int qic02_tape_release(struct inode * inode, struct file * filp) { kdev_t dev = inode->i_rdev; if (TP_DIAGS(dev)) { printk("qic02_tape_release: dev=%s\n", kdevname(dev)); } 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(dev)) && (status_bytes_rd | status_bytes_wr)) { tpqputs(TPQD_REWIND, "release: Doing rewind..."); (void) do_qic_cmd(QCMD_REWIND, TIM_R); } } #ifdef MODULE MOD_DEC_USE_COUNT; #endif 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 dev_maj = MAJOR(inode->i_rdev); int c; struct mtop operation; unsigned char blk_addr[6]; struct mtpos ioctl_tell; if (TP_DIAGS(current_tape_dev)) { printk(TPQIC02_NAME ": ioctl(%4x, %4x, %4lx)\n", dev_maj, iocmd, ioarg); } if (!inode || !ioarg) { return -EINVAL; } /* check iocmd first */ if (dev_maj != QIC02_TAPE_MAJOR) { printk(TPQIC02_NAME ": Oops! Wrong device?\n"); /* A panic() would be appropriate here */ return -ENODEV; } c = _IOC_NR(iocmd); #ifdef CONFIG_QIC02_DYNCONF if (c == _IOC_NR(MTIOCGETCONFIG)) { CHECK_IOC_SIZE(mtconfiginfo); if (copy_to_user((char *) ioarg, (char *) &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 (!suser()) { 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((char *) &qic02_tape_dynconf, (char *) ioarg, 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((char *) &operation, (char *) ioarg, 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_tape_dev)) { 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_tape_dev)) { 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((char *) ioarg, (char *) &ioctl_status, sizeof(ioctl_status))) { return -EFAULT; } return 0; } else if (TP_HAVE_TELL && (c == _IOC_NR(MTIOCPOS))) { if (TP_DIAGS(current_tape_dev)) { 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((char *) ioarg, (char *) &ioctl_tell, sizeof(ioctl_tell))) { return -EFAULT; } return 0; } else { return -ENOTTY; /* Other cmds not supported. */ } } /* qic02_tape_ioctl */ /* These are (most) of the interface functions: */ static struct file_operations qic02_tape_fops = { qic02_tape_lseek, /* not allowed */ qic02_tape_read, /* read */ qic02_tape_write, /* write */ NULL, /* readdir not allowed */ NULL, /* poll ??? */ qic02_tape_ioctl, /* ioctl */ NULL, /* mmap not allowed */ qic02_tape_open, /* open */ NULL, /* flush */ qic02_tape_release, /* release */ NULL, /* fsync */ NULL, /* fasync */ NULL, /* check_media_change */ NULL /* revalidate */ }; /* Why is this not is one place? */ /* Pure 2^n version of get_order */ static inline int __get_order(unsigned long size) { int order; size = (size-1) >> (PAGE_SHIFT-1); order = -1; do { size >>= 1; order++; } while (size); return order; } 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(buffaddr, __get_order(TPQBUF_SIZE)); } buffaddr = 0; /* 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. */ if (QIC02_TAPE_IRQ>16) { tpqputs(TPQD_ALWAYS, "Bogus interrupt number."); return -ENXIO; } /* for DYNCONF, allocating IO, DMA and IRQ should not be done until * the config parameters have been set using MTSETCONFIG. */ if (check_region(QIC02_TAPE_PORT, QIC02_TAPE_PORT_RANGE)) { 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); 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); return -EBUSY; } /* Grab the IO region. We already made sure it's available. */ request_region(QIC02_TAPE_PORT, QIC02_TAPE_PORT_RANGE, TPQIC02_NAME); /* Setup the page-address for the dma transfer. */ /*** TODO: does _get_dma_pages() really return the physical address?? ****/ buffaddr = __get_dma_pages(GFP_KERNEL,__get_order(TPQBUF_SIZE)); if (!buffaddr) { qic02_release_resources(); return -EBUSY; /* Not ideal, EAGAIN perhaps? */ } memset( (void*) 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 */ __initfunc(int 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_tape_dev = MKDEV(QIC02_TAPE_MAJOR, 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; } /* prepare timer */ TIMEROFF; timer_table[QIC02_TAPE_TIMER].expires = 0; timer_table[QIC02_TAPE_TIMER].fn = 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 */ #ifdef MODULE void cleanup_module(void) { if (status_zombie == NO) { qic02_release_resources(); } unregister_chrdev(QIC02_TAPE_MAJOR, TPQIC02_NAME); } int init_module(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) { cleanup_module(); } } # endif return retval; } #endif |