diff options
Diffstat (limited to 'drivers/char/ftape/lowlevel/ftape-io.c')
| -rw-r--r-- | drivers/char/ftape/lowlevel/ftape-io.c | 992 |
1 files changed, 992 insertions, 0 deletions
diff --git a/drivers/char/ftape/lowlevel/ftape-io.c b/drivers/char/ftape/lowlevel/ftape-io.c new file mode 100644 index 000000000000..259015aeff55 --- /dev/null +++ b/drivers/char/ftape/lowlevel/ftape-io.c @@ -0,0 +1,992 @@ +/* + * Copyright (C) 1993-1996 Bas Laarhoven, + * (C) 1996 Kai Harrekilde-Petersen, + * (C) 1997 Claus-Justus Heine. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; see the file COPYING. If not, write to + the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + + * + * $Source: /homes/cvs/ftape-stacked/ftape/lowlevel/ftape-io.c,v $ + * $Revision: 1.4 $ + * $Date: 1997/11/11 14:02:36 $ + * + * This file contains the general control functions for the + * QIC-40/80/3010/3020 floppy-tape driver "ftape" for Linux. + */ + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <asm/system.h> +#include <linux/ioctl.h> +#include <linux/mtio.h> +#include <linux/delay.h> + +#include <linux/ftape.h> +#include <linux/qic117.h> +#include "../lowlevel/ftape-tracing.h" +#include "../lowlevel/fdc-io.h" +#include "../lowlevel/ftape-io.h" +#include "../lowlevel/ftape-ctl.h" +#include "../lowlevel/ftape-rw.h" +#include "../lowlevel/ftape-write.h" +#include "../lowlevel/ftape-read.h" +#include "../lowlevel/ftape-init.h" +#include "../lowlevel/ftape-calibr.h" + +/* Global vars. + */ +/* NOTE: sectors start numbering at 1, all others at 0 ! */ +ft_timeout_table ftape_timeout; +unsigned int ftape_tape_len; +volatile qic117_cmd_t ftape_current_command; +const struct qic117_command_table qic117_cmds[] = QIC117_COMMANDS; +int ftape_might_be_off_track; + +/* Local vars. + */ +static int diagnostic_mode; +static unsigned int ftape_udelay_count; +static unsigned int ftape_udelay_time; + +void ftape_udelay(unsigned int usecs) +{ + volatile int count = (ftape_udelay_count * usecs + + ftape_udelay_count - 1) / ftape_udelay_time; + volatile int i; + + while (count-- > 0) { + for (i = 0; i < 20; ++i); + } +} + +void ftape_udelay_calibrate(void) +{ + ftape_calibrate("ftape_udelay", + ftape_udelay, &ftape_udelay_count, &ftape_udelay_time); +} + +/* Delay (msec) routine. + */ +void ftape_sleep(unsigned int time) +{ + TRACE_FUN(ft_t_any); + + time *= 1000; /* msecs -> usecs */ + if (time < FT_USPT) { + /* Time too small for scheduler, do a busy wait ! */ + ftape_udelay(time); + } else { + long timeout; + unsigned long flags; + unsigned int ticks = (time + FT_USPT - 1) / FT_USPT; + + TRACE(ft_t_any, "%d msec, %d ticks", time/1000, ticks); + timeout = ticks; + save_flags(flags); + sti(); + msleep_interruptible(jiffies_to_msecs(timeout)); + /* Mmm. Isn't current->blocked == 0xffffffff ? + */ + if (signal_pending(current)) { + TRACE(ft_t_err, "awoken by non-blocked signal :-("); + } + restore_flags(flags); + } + TRACE_EXIT; +} + +/* send a command or parameter to the drive + * Generates # of step pulses. + */ +static inline int ft_send_to_drive(int arg) +{ + /* Always wait for a command_timeout period to separate + * individuals commands and/or parameters. + */ + ftape_sleep(3 * FT_MILLISECOND); + /* Keep cylinder nr within range, step towards home if possible. + */ + if (ftape_current_cylinder >= arg) { + return fdc_seek(ftape_current_cylinder - arg); + } else { + return fdc_seek(ftape_current_cylinder + arg); + } +} + +/* forward */ int ftape_report_raw_drive_status(int *status); + +static int ft_check_cmd_restrictions(qic117_cmd_t command) +{ + int status = -1; + TRACE_FUN(ft_t_any); + + TRACE(ft_t_flow, "%s", qic117_cmds[command].name); + /* A new motion command during an uninterruptible (motion) + * command requires a ready status before the new command can + * be issued. Otherwise a new motion command needs to be + * checked against required status. + */ + if (qic117_cmds[command].cmd_type == motion && + qic117_cmds[ftape_current_command].non_intr) { + ftape_report_raw_drive_status(&status); + if ((status & QIC_STATUS_READY) == 0) { + TRACE(ft_t_noise, + "motion cmd (%d) during non-intr cmd (%d)", + command, ftape_current_command); + TRACE(ft_t_noise, "waiting until drive gets ready"); + ftape_ready_wait(ftape_timeout.seek, + &status); + } + } + if (qic117_cmds[command].mask != 0) { + __u8 difference; + /* Some commands do require a certain status: + */ + if (status == -1) { /* not yet set */ + ftape_report_raw_drive_status(&status); + } + difference = ((status ^ qic117_cmds[command].state) & + qic117_cmds[command].mask); + /* Wait until the drive gets + * ready. This may last forever if + * the drive never gets ready... + */ + while ((difference & QIC_STATUS_READY) != 0) { + TRACE(ft_t_noise, "command %d issued while not ready", + command); + TRACE(ft_t_noise, "waiting until drive gets ready"); + if (ftape_ready_wait(ftape_timeout.seek, + &status) == -EINTR) { + /* Bail out on signal ! + */ + TRACE_ABORT(-EINTR, ft_t_warn, + "interrupted by non-blockable signal"); + } + difference = ((status ^ qic117_cmds[command].state) & + qic117_cmds[command].mask); + } + while ((difference & QIC_STATUS_ERROR) != 0) { + int err; + qic117_cmd_t cmd; + + TRACE(ft_t_noise, + "command %d issued while error pending", + command); + TRACE(ft_t_noise, "clearing error status"); + ftape_report_error(&err, &cmd, 1); + ftape_report_raw_drive_status(&status); + difference = ((status ^ qic117_cmds[command].state) & + qic117_cmds[command].mask); + if ((difference & QIC_STATUS_ERROR) != 0) { + /* Bail out on fatal signal ! + */ + FT_SIGNAL_EXIT(_NEVER_BLOCK); + } + } + if (difference) { + /* Any remaining difference can't be solved + * here. + */ + if (difference & (QIC_STATUS_CARTRIDGE_PRESENT | + QIC_STATUS_NEW_CARTRIDGE | + QIC_STATUS_REFERENCED)) { + TRACE(ft_t_warn, + "Fatal: tape removed or reinserted !"); + ft_failure = 1; + } else { + TRACE(ft_t_err, "wrong state: 0x%02x should be: 0x%02x", + status & qic117_cmds[command].mask, + qic117_cmds[command].state); + } + TRACE_EXIT -EIO; + } + if (~status & QIC_STATUS_READY & qic117_cmds[command].mask) { + TRACE_ABORT(-EBUSY, ft_t_err, "Bad: still busy!"); + } + } + TRACE_EXIT 0; +} + +/* Issue a tape command: + */ +int ftape_command(qic117_cmd_t command) +{ + int result = 0; + static int level; + TRACE_FUN(ft_t_any); + + if ((unsigned int)command > NR_ITEMS(qic117_cmds)) { + /* This is a bug we'll want to know about too. + */ + TRACE_ABORT(-EIO, ft_t_bug, "bug - bad command: %d", command); + } + if (++level > 5) { /* This is a bug we'll want to know about. */ + --level; + TRACE_ABORT(-EIO, ft_t_bug, "bug - recursion for command: %d", + command); + } + /* disable logging and restriction check for some commands, + * check all other commands that have a prescribed starting + * status. + */ + if (diagnostic_mode) { + TRACE(ft_t_flow, "diagnostic command %d", command); + } else if (command == QIC_REPORT_DRIVE_STATUS || + command == QIC_REPORT_NEXT_BIT) { + TRACE(ft_t_any, "%s", qic117_cmds[command].name); + } else { + TRACE_CATCH(ft_check_cmd_restrictions(command), --level); + } + /* Now all conditions are met or result was < 0. + */ + result = ft_send_to_drive((unsigned int)command); + if (qic117_cmds[command].cmd_type == motion && + command != QIC_LOGICAL_FORWARD && command != QIC_STOP_TAPE) { + ft_location.known = 0; + } + ftape_current_command = command; + --level; + TRACE_EXIT result; +} + +/* Send a tape command parameter: + * Generates command # of step pulses. + * Skips tape-status call ! + */ +int ftape_parameter(unsigned int parameter) +{ + TRACE_FUN(ft_t_any); + + TRACE(ft_t_flow, "called with parameter = %d", parameter); + TRACE_EXIT ft_send_to_drive(parameter + 2); +} + +/* Wait for the drive to get ready. + * timeout time in milli-seconds + * Returned status is valid if result != -EIO + * + * Should we allow to be killed by SIGINT? (^C) + * Would be nice at least for large timeouts. + */ +int ftape_ready_wait(unsigned int timeout, int *status) +{ + unsigned long t0; + unsigned int poll_delay; + int signal_retries; + TRACE_FUN(ft_t_any); + + /* the following ** REALLY ** reduces the system load when + * e.g. one simply rewinds or retensions. The tape is slow + * anyway. It is really not necessary to detect error + * conditions with 1/10 seconds granularity + * + * On my AMD 133MHZ 486: 100 ms: 23% system load + * 1 sec: 5% + * 5 sec: 0.6%, yeah + */ + if (timeout <= FT_SECOND) { + poll_delay = 100 * FT_MILLISECOND; + signal_retries = 20; /* two seconds */ + } else if (timeout < 20 * FT_SECOND) { + TRACE(ft_t_flow, "setting poll delay to 1 second"); + poll_delay = FT_SECOND; + signal_retries = 2; /* two seconds */ + } else { + TRACE(ft_t_flow, "setting poll delay to 5 seconds"); + poll_delay = 5 * FT_SECOND; + signal_retries = 1; /* five seconds */ + } + for (;;) { + t0 = jiffies; + TRACE_CATCH(ftape_report_raw_drive_status(status),); + if (*status & QIC_STATUS_READY) { + TRACE_EXIT 0; + } + if (!signal_retries--) { + FT_SIGNAL_EXIT(_NEVER_BLOCK); + } + if ((int)timeout >= 0) { + /* this will fail when jiffies wraps around about + * once every year :-) + */ + timeout -= ((jiffies - t0) * FT_SECOND) / HZ; + if (timeout <= 0) { + TRACE_ABORT(-ETIME, ft_t_err, "timeout"); + } + ftape_sleep(poll_delay); + timeout -= poll_delay; + } else { + ftape_sleep(poll_delay); + } + } + TRACE_EXIT -ETIME; +} + +/* Issue command and wait up to timeout milli seconds for drive ready + */ +int ftape_command_wait(qic117_cmd_t command, unsigned int timeout, int *status) +{ + int result; + + /* Drive should be ready, issue command + */ + result = ftape_command(command); + if (result >= 0) { + result = ftape_ready_wait(timeout, status); + } + return result; +} + +static int ftape_parameter_wait(unsigned int parm, unsigned int timeout, int *status) +{ + int result; + + /* Drive should be ready, issue command + */ + result = ftape_parameter(parm); + if (result >= 0) { + result = ftape_ready_wait(timeout, status); + } + return result; +} + +/*-------------------------------------------------------------------------- + * Report operations + */ + +/* Query the drive about its status. The command is sent and + result_length bits of status are returned (2 extra bits are read + for start and stop). */ + +int ftape_report_operation(int *status, + qic117_cmd_t command, + int result_length) +{ + int i, st3; + unsigned int t0; + unsigned int dt; + TRACE_FUN(ft_t_any); + + TRACE_CATCH(ftape_command(command),); + t0 = ftape_timestamp(); + i = 0; + do { + ++i; + ftape_sleep(3 * FT_MILLISECOND); /* see remark below */ + TRACE_CATCH(fdc_sense_drive_status(&st3),); + dt = ftape_timediff(t0, ftape_timestamp()); + /* Ack should be asserted within Ttimout + Tack = 6 msec. + * Looks like some drives fail to do this so extend this + * period to 300 msec. + */ + } while (!(st3 & ST3_TRACK_0) && dt < 300000); + if (!(st3 & ST3_TRACK_0)) { + TRACE(ft_t_err, + "No acknowledge after %u msec. (%i iter)", dt / 1000, i); + TRACE_ABORT(-EIO, ft_t_err, "timeout on Acknowledge"); + } + /* dt may be larger than expected because of other tasks + * scheduled while we were sleeping. + */ + if (i > 1 && dt > 6000) { + TRACE(ft_t_err, "Acknowledge after %u msec. (%i iter)", + dt / 1000, i); + } + *status = 0; + for (i = 0; i < result_length + 1; i++) { + TRACE_CATCH(ftape_command(QIC_REPORT_NEXT_BIT),); + TRACE_CATCH(fdc_sense_drive_status(&st3),); + if (i < result_length) { + *status |= ((st3 & ST3_TRACK_0) ? 1 : 0) << i; + } else if ((st3 & ST3_TRACK_0) == 0) { + TRACE_ABORT(-EIO, ft_t_err, "missing status stop bit"); + } + } + /* this command will put track zero and index back into normal state */ + (void)ftape_command(QIC_REPORT_NEXT_BIT); + TRACE_EXIT 0; +} + +/* Report the current drive status. */ + +int ftape_report_raw_drive_status(int *status) +{ + int result; + int count = 0; + TRACE_FUN(ft_t_any); + + do { + result = ftape_report_operation(status, + QIC_REPORT_DRIVE_STATUS, 8); + } while (result < 0 && ++count <= 3); + if (result < 0) { + TRACE_ABORT(-EIO, ft_t_err, + "report_operation failed after %d trials", count); + } + if ((*status & 0xff) == 0xff) { + TRACE_ABORT(-EIO, ft_t_err, + "impossible drive status 0xff"); + } + if (*status & QIC_STATUS_READY) { + ftape_current_command = QIC_NO_COMMAND; /* completed */ + } + ft_last_status.status.drive_status = (__u8)(*status & 0xff); + TRACE_EXIT 0; +} + +int ftape_report_drive_status(int *status) +{ + TRACE_FUN(ft_t_any); + + TRACE_CATCH(ftape_report_raw_drive_status(status),); + if (*status & QIC_STATUS_NEW_CARTRIDGE || + !(*status & QIC_STATUS_CARTRIDGE_PRESENT)) { + ft_failure = 1; /* will inhibit further operations */ + TRACE_EXIT -EIO; + } + if (*status & QIC_STATUS_READY && *status & QIC_STATUS_ERROR) { + /* Let caller handle all errors */ + TRACE_ABORT(1, ft_t_warn, "warning: error status set!"); + } + TRACE_EXIT 0; +} + +int ftape_report_error(unsigned int *error, + qic117_cmd_t *command, int report) +{ + static const ftape_error ftape_errors[] = QIC117_ERRORS; + int code; + TRACE_FUN(ft_t_any); + + TRACE_CATCH(ftape_report_operation(&code, QIC_REPORT_ERROR_CODE, 16),); + *error = (unsigned int)(code & 0xff); + *command = (qic117_cmd_t)((code>>8)&0xff); + /* remember hardware status, maybe useful for status ioctls + */ + ft_last_error.error.command = (__u8)*command; + ft_last_error.error.error = (__u8)*error; + if (!report) { + TRACE_EXIT 0; + } + if (*error == 0) { + TRACE_ABORT(0, ft_t_info, "No error"); + } + TRACE(ft_t_info, "errorcode: %d", *error); + if (*error < NR_ITEMS(ftape_errors)) { + TRACE(ft_t_noise, "%sFatal ERROR:", + (ftape_errors[*error].fatal ? "" : "Non-")); + TRACE(ft_t_noise, "%s ...", ftape_errors[*error].message); + } else { + TRACE(ft_t_noise, "Unknown ERROR !"); + } + if ((unsigned int)*command < NR_ITEMS(qic117_cmds) && + qic117_cmds[*command].name != NULL) { + TRACE(ft_t_noise, "... caused by command \'%s\'", + qic117_cmds[*command].name); + } else { + TRACE(ft_t_noise, "... caused by unknown command %d", + *command); + } + TRACE_EXIT 0; +} + +int ftape_report_configuration(qic_model *model, + unsigned int *rate, + int *qic_std, + int *tape_len) +{ + int result; + int config; + int status; + static const unsigned int qic_rates[ 4] = { 250, 2000, 500, 1000 }; + TRACE_FUN(ft_t_any); + + result = ftape_report_operation(&config, + QIC_REPORT_DRIVE_CONFIGURATION, 8); + if (result < 0) { + ft_last_status.status.drive_config = (__u8)0x00; + *model = prehistoric; + *rate = 500; + *qic_std = QIC_TAPE_QIC40; + *tape_len = 205; + TRACE_EXIT 0; + } else { + ft_last_status.status.drive_config = (__u8)(config & 0xff); + } + *rate = qic_rates[(config & QIC_CONFIG_RATE_MASK) >> QIC_CONFIG_RATE_SHIFT]; + result = ftape_report_operation(&status, QIC_REPORT_TAPE_STATUS, 8); + if (result < 0) { + ft_last_status.status.tape_status = (__u8)0x00; + /* pre- QIC117 rev C spec. drive, QIC_CONFIG_80 bit is valid. + */ + *qic_std = (config & QIC_CONFIG_80) ? + QIC_TAPE_QIC80 : QIC_TAPE_QIC40; + /* ?? how's about 425ft tapes? */ + *tape_len = (config & QIC_CONFIG_LONG) ? 307 : 0; + *model = pre_qic117c; + result = 0; + } else { + ft_last_status.status.tape_status = (__u8)(status & 0xff); + *model = post_qic117b; + TRACE(ft_t_any, "report tape status result = %02x", status); + /* post- QIC117 rev C spec. drive, QIC_CONFIG_80 bit is + * invalid. + */ + switch (status & QIC_TAPE_STD_MASK) { + case QIC_TAPE_QIC40: + case QIC_TAPE_QIC80: + case QIC_TAPE_QIC3020: + case QIC_TAPE_QIC3010: + *qic_std = status & QIC_TAPE_STD_MASK; + break; + default: + *qic_std = -1; + break; + } + switch (status & QIC_TAPE_LEN_MASK) { + case QIC_TAPE_205FT: + /* 205 or 425+ ft 550 Oe tape */ + *tape_len = 0; + break; + case QIC_TAPE_307FT: + /* 307.5 ft 550 Oe Extended Length (XL) tape */ + *tape_len = 307; + break; + case QIC_TAPE_VARIABLE: + /* Variable length 550 Oe tape */ + *tape_len = 0; + break; + case QIC_TAPE_1100FT: + /* 1100 ft 550 Oe tape */ + *tape_len = 1100; + break; + case QIC_TAPE_FLEX: + /* Variable length 900 Oe tape */ + *tape_len = 0; + break; + default: + *tape_len = -1; + break; + } + if (*qic_std == -1 || *tape_len == -1) { + TRACE(ft_t_any, + "post qic-117b spec drive with unknown tape"); + } + result = *tape_len == -1 ? -EIO : 0; + if (status & QIC_TAPE_WIDE) { + switch (*qic_std) { + case QIC_TAPE_QIC80: + TRACE(ft_t_info, "TR-1 tape detected"); + break; + case QIC_TAPE_QIC3010: + TRACE(ft_t_info, "TR-2 tape detected"); + break; + case QIC_TAPE_QIC3020: + TRACE(ft_t_info, "TR-3 tape detected"); + break; + default: + TRACE(ft_t_warn, + "Unknown Travan tape type detected"); + break; + } + } + } + TRACE_EXIT (result < 0) ? -EIO : 0; +} + +static int ftape_report_rom_version(int *version) +{ + + if (ftape_report_operation(version, QIC_REPORT_ROM_VERSION, 8) < 0) { + return -EIO; + } else { + return 0; + } +} + +void ftape_report_vendor_id(unsigned int *id) +{ + int result; + TRACE_FUN(ft_t_any); + + /* We'll try to get a vendor id from the drive. First + * according to the QIC-117 spec, a 16-bit id is requested. + * If that fails we'll try an 8-bit version, otherwise we'll + * try an undocumented query. + */ + result = ftape_report_operation((int *) id, QIC_REPORT_VENDOR_ID, 16); + if (result < 0) { + result = ftape_report_operation((int *) id, + QIC_REPORT_VENDOR_ID, 8); + if (result < 0) { + /* The following is an undocumented call found + * in the CMS code. + */ + result = ftape_report_operation((int *) id, 24, 8); + if (result < 0) { + *id = UNKNOWN_VENDOR; + } else { + TRACE(ft_t_noise, "got old 8 bit id: %04x", + *id); + *id |= 0x20000; + } + } else { + TRACE(ft_t_noise, "got 8 bit id: %04x", *id); + *id |= 0x10000; + } + } else { + TRACE(ft_t_noise, "got 16 bit id: %04x", *id); + } + if (*id == 0x0047) { + int version; + int sign; + + if (ftape_report_rom_version(&version) < 0) { + TRACE(ft_t_bug, "report rom version failed"); + TRACE_EXIT; + } + TRACE(ft_t_noise, "CMS rom version: %d", version); + ftape_command(QIC_ENTER_DIAGNOSTIC_1); + ftape_command(QIC_ENTER_DIAGNOSTIC_1); + diagnostic_mode = 1; + if (ftape_report_operation(&sign, 9, 8) < 0) { + unsigned int error; + qic117_cmd_t command; + + ftape_report_error(&error, &command, 1); + ftape_command(QIC_ENTER_PRIMARY_MODE); + diagnostic_mode = 0; + TRACE_EXIT; /* failure ! */ + } else { + TRACE(ft_t_noise, "CMS signature: %02x", sign); + } + if (sign == 0xa5) { + result = ftape_report_operation(&sign, 37, 8); + if (result < 0) { + if (version >= 63) { + *id = 0x8880; + TRACE(ft_t_noise, + "This is an Iomega drive !"); + } else { + *id = 0x0047; + TRACE(ft_t_noise, + "This is a real CMS drive !"); + } + } else { + *id = 0x0047; + TRACE(ft_t_noise, "CMS status: %d", sign); + } + } else { + *id = UNKNOWN_VENDOR; + } + ftape_command(QIC_ENTER_PRIMARY_MODE); + diagnostic_mode = 0; + } + TRACE_EXIT; +} + +static int qic_rate_code(unsigned int rate) +{ + switch (rate) { + case 250: + return QIC_CONFIG_RATE_250; + case 500: + return QIC_CONFIG_RATE_500; + case 1000: + return QIC_CONFIG_RATE_1000; + case 2000: + return QIC_CONFIG_RATE_2000; + default: + return QIC_CONFIG_RATE_500; + } +} + +static int ftape_set_rate_test(unsigned int *max_rate) +{ + unsigned int error; + qic117_cmd_t command; + int status; + int supported = 0; + TRACE_FUN(ft_t_any); + + /* Check if the drive does support the select rate command + * by testing all different settings. If any one is accepted + * we assume the command is supported, else not. + */ + for (*max_rate = 2000; *max_rate >= 250; *max_rate /= 2) { + if (ftape_command(QIC_SELECT_RATE) < 0) { + continue; + } + if (ftape_parameter_wait(qic_rate_code(*max_rate), + 1 * FT_SECOND, &status) < 0) { + continue; + } + if (status & QIC_STATUS_ERROR) { + ftape_report_error(&error, &command, 0); + continue; + } + supported = 1; /* did accept a request */ + break; + } + TRACE(ft_t_noise, "Select Rate command is%s supported", + supported ? "" : " not"); + TRACE_EXIT supported; +} + +int ftape_set_data_rate(unsigned int new_rate /* Kbps */, unsigned int qic_std) +{ + int status; + int result = 0; + unsigned int data_rate = new_rate; + static int supported; + int rate_changed = 0; + qic_model dummy_model; + unsigned int dummy_qic_std, dummy_tape_len; + TRACE_FUN(ft_t_any); + + if (ft_drive_max_rate == 0) { /* first time */ + supported = ftape_set_rate_test(&ft_drive_max_rate); + } + if (supported) { + ftape_command(QIC_SELECT_RATE); + result = ftape_parameter_wait(qic_rate_code(new_rate), + 1 * FT_SECOND, &status); + if (result >= 0 && !(status & QIC_STATUS_ERROR)) { + rate_changed = 1; + } + } + TRACE_CATCH(result = ftape_report_configuration(&dummy_model, + &data_rate, + &dummy_qic_std, + &dummy_tape_len),); + if (data_rate != new_rate) { + if (!supported) { + TRACE(ft_t_warn, "Rate change not supported!"); + } else if (rate_changed) { + TRACE(ft_t_warn, "Requested: %d, got %d", + new_rate, data_rate); + } else { + TRACE(ft_t_warn, "Rate change failed!"); + } + result = -EINVAL; + } + /* + * Set data rate and write precompensation as specified: + * + * | QIC-40/80 | QIC-3010/3020 + * rate | precomp | precomp + * ----------+-------------+-------------- + * 250 Kbps. | 250 ns. | 0 ns. + * 500 Kbps. | 125 ns. | 0 ns. + * 1 Mbps. | 42 ns. | 0 ns. + * 2 Mbps | N/A | 0 ns. + */ + if ((qic_std == QIC_TAPE_QIC40 && data_rate > 500) || + (qic_std == QIC_TAPE_QIC80 && data_rate > 1000)) { + TRACE_ABORT(-EINVAL, + ft_t_warn, "Datarate too high for QIC-mode"); + } + TRACE_CATCH(fdc_set_data_rate(data_rate),_res = -EINVAL); + ft_data_rate = data_rate; + if (qic_std == QIC_TAPE_QIC40 || qic_std == QIC_TAPE_QIC80) { + switch (data_rate) { + case 250: + fdc_set_write_precomp(250); + break; + default: + case 500: + fdc_set_write_precomp(125); + break; + case 1000: + fdc_set_write_precomp(42); + break; + } + } else { + fdc_set_write_precomp(0); + } + TRACE_EXIT result; +} + +/* The next two functions are used to cope with excessive overrun errors + */ +int ftape_increase_threshold(void) +{ + TRACE_FUN(ft_t_flow); + + if (fdc.type < i82077 || ft_fdc_threshold >= 12) { + TRACE_ABORT(-EIO, ft_t_err, "cannot increase fifo threshold"); + } + if (fdc_fifo_threshold(++ft_fdc_threshold, NULL, NULL, NULL) < 0) { + TRACE(ft_t_err, "cannot increase fifo threshold"); + ft_fdc_threshold --; + fdc_reset(); + } + TRACE(ft_t_info, "New FIFO threshold: %d", ft_fdc_threshold); + TRACE_EXIT 0; +} + +int ftape_half_data_rate(void) +{ + if (ft_data_rate < 500) { + return -1; + } + if (ftape_set_data_rate(ft_data_rate / 2, ft_qic_std) < 0) { + return -EIO; + } + ftape_calc_timeouts(ft_qic_std, ft_data_rate, ftape_tape_len); + return 0; +} + +/* Seek the head to the specified track. + */ +int ftape_seek_head_to_track(unsigned int track) +{ + int status; + TRACE_FUN(ft_t_any); + + ft_location.track = -1; /* remains set in case of error */ + if (track >= ft_tracks_per_tape) { + TRACE_ABORT(-EINVAL, ft_t_bug, "track out of bounds"); + } + TRACE(ft_t_flow, "seeking track %d", track); + TRACE_CATCH(ftape_command(QIC_SEEK_HEAD_TO_TRACK),); + TRACE_CATCH(ftape_parameter_wait(track, ftape_timeout.head_seek, + &status),); + ft_location.track = track; + ftape_might_be_off_track = 0; + TRACE_EXIT 0; +} + +int ftape_wakeup_drive(wake_up_types method) +{ + int status; + int motor_on = 0; + TRACE_FUN(ft_t_any); + + switch (method) { + case wake_up_colorado: + TRACE_CATCH(ftape_command(QIC_PHANTOM_SELECT),); + TRACE_CATCH(ftape_parameter(0 /* ft_drive_sel ?? */),); + break; + case wake_up_mountain: + TRACE_CATCH(ftape_command(QIC_SOFT_SELECT),); + ftape_sleep(FT_MILLISECOND); /* NEEDED */ + TRACE_CATCH(ftape_parameter(18),); + break; + case wake_up_insight: + ftape_sleep(100 * FT_MILLISECOND); + motor_on = 1; + fdc_motor(motor_on); /* enable is done by motor-on */ + case no_wake_up: + break; + default: + TRACE_EXIT -ENODEV; /* unknown wakeup method */ + break; + } + /* If wakeup succeeded we shouldn't get an error here.. + */ + TRACE_CATCH(ftape_report_raw_drive_status(&status), + if (motor_on) { + fdc_motor(0); + }); + TRACE_EXIT 0; +} + +int ftape_put_drive_to_sleep(wake_up_types method) +{ + TRACE_FUN(ft_t_any); + + switch (method) { + case wake_up_colorado: + TRACE_CATCH(ftape_command(QIC_PHANTOM_DESELECT),); + break; + case wake_up_mountain: + TRACE_CATCH(ftape_command(QIC_SOFT_DESELECT),); + break; + case wake_up_insight: + fdc_motor(0); /* enable is done by motor-on */ + case no_wake_up: /* no wakeup / no sleep ! */ + break; + default: + TRACE_EXIT -ENODEV; /* unknown wakeup method */ + } + TRACE_EXIT 0; +} + +int ftape_reset_drive(void) +{ + int result = 0; + int status; + unsigned int err_code; + qic117_cmd_t err_command; + int i; + TRACE_FUN(ft_t_any); + + /* We want to re-establish contact with our drive. Fire a + * number of reset commands (single step pulses) and pray for + * success. + */ + for (i = 0; i < 2; ++i) { + TRACE(ft_t_flow, "Resetting fdc"); + fdc_reset(); + ftape_sleep(10 * FT_MILLISECOND); + TRACE(ft_t_flow, "Reset command to drive"); + result = ftape_command(QIC_RESET); + if (result == 0) { + ftape_sleep(1 * FT_SECOND); /* drive not + * accessible + * during 1 second + */ + TRACE(ft_t_flow, "Re-selecting drive"); + + /* Strange, the QIC-117 specs don't mention + * this but the drive gets deselected after a + * soft reset ! So we need to enable it + * again. + */ + if (ftape_wakeup_drive(ft_drive_type.wake_up) < 0) { + TRACE(ft_t_err, "Wakeup failed !"); + } + TRACE(ft_t_flow, "Waiting until drive gets ready"); + result= ftape_ready_wait(ftape_timeout.reset, &status); + if (result == 0 && (status & QIC_STATUS_ERROR)) { + result = ftape_report_error(&err_code, + &err_command, 1); + if (result == 0 && err_code == 27) { + /* Okay, drive saw reset + * command and responded as it + * should + */ + break; + } else { + result = -EIO; + } + } else { + result = -EIO; + } + } + FT_SIGNAL_EXIT(_DONT_BLOCK); + } + if (result != 0) { + TRACE(ft_t_err, "General failure to reset tape drive"); + } else { + /* Restore correct settings: keep original rate + */ + ftape_set_data_rate(ft_data_rate, ft_qic_std); + } + ftape_init_drive_needed = 1; + TRACE_EXIT result; +} |
