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1da177e4c3
linux_dsm_epyc7002/drivers/char/ftape/lowlevel/ftape-ctl.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

898 lines
25 KiB
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/*
* Copyright (C) 1993-1996 Bas Laarhoven,
* 1996-1997 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-ctl.c,v $
* $Revision: 1.4 $
* $Date: 1997/11/11 14:37:44 $
*
* This file contains the non-read/write ftape functions for the
* QIC-40/80/3010/3020 floppy-tape driver "ftape" for Linux.
*/
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/ftape.h>
#include <linux/qic117.h>
#include <asm/uaccess.h>
#include <asm/io.h>
/* ease porting between pre-2.4.x and later kernels */
#define vma_get_pgoff(v) ((v)->vm_pgoff)
#include "../lowlevel/ftape-tracing.h"
#include "../lowlevel/ftape-io.h"
#include "../lowlevel/ftape-ctl.h"
#include "../lowlevel/ftape-write.h"
#include "../lowlevel/ftape-read.h"
#include "../lowlevel/ftape-rw.h"
#include "../lowlevel/ftape-bsm.h"
/* Global vars.
*/
ftape_info ftape_status = {
/* vendor information */
{ 0, }, /* drive type */
/* data rates */
500, /* used data rate */
500, /* drive max rate */
500, /* fdc max rate */
/* drive selection, either FTAPE_SEL_A/B/C/D */
-1, /* drive selection */
/* flags set after decode the drive and tape status */
0, /* formatted */
1, /* no tape */
1, /* write protected */
1, /* new tape */
/* values of last queried drive/tape status and error */
{{0,}}, /* last error code */
{{0,}}, /* drive status, configuration, tape status */
/* cartridge geometry */
20, /* tracks_per_tape */
102, /* segments_per_track */
/* location of header segments, etc. */
-1, /* used_header_segment */
-1, /* header_segment_1 */
-1, /* header_segment_2 */
-1, /* first_data_segment */
-1, /* last_data_segment */
/* the format code as stored in the header segment */
fmt_normal, /* format code */
/* the default for the qic std: unknown */
-1,
/* is tape running? */
idle, /* runner_state */
/* is tape reading/writing/verifying/formatting/deleting */
idle, /* driver state */
/* flags fatal hardware error */
1, /* failure */
/* history record */
{ 0, } /* history record */
};
int ftape_segments_per_head = 1020;
int ftape_segments_per_cylinder = 4;
int ftape_init_drive_needed = 1; /* need to be global for ftape_reset_drive()
* in ftape-io.c
*/
/* Local vars.
*/
static const vendor_struct vendors[] = QIC117_VENDORS;
static const wakeup_method methods[] = WAKEUP_METHODS;
const ftape_info *ftape_get_status(void)
{
#if defined(STATUS_PARANOYA)
static ftape_info get_status;
get_status = ftape_status;
return &get_status;
#else
return &ftape_status; /* maybe return only a copy of it to assure
* read only access
*/
#endif
}
static int ftape_not_operational(int status)
{
/* return true if status indicates tape can not be used.
*/
return ((status ^ QIC_STATUS_CARTRIDGE_PRESENT) &
(QIC_STATUS_ERROR |
QIC_STATUS_CARTRIDGE_PRESENT |
QIC_STATUS_NEW_CARTRIDGE));
}
int ftape_seek_to_eot(void)
{
int status;
TRACE_FUN(ft_t_any);
TRACE_CATCH(ftape_ready_wait(ftape_timeout.pause, &status),);
while ((status & QIC_STATUS_AT_EOT) == 0) {
if (ftape_not_operational(status)) {
TRACE_EXIT -EIO;
}
TRACE_CATCH(ftape_command_wait(QIC_PHYSICAL_FORWARD,
ftape_timeout.rewind,&status),);
}
TRACE_EXIT 0;
}
int ftape_seek_to_bot(void)
{
int status;
TRACE_FUN(ft_t_any);
TRACE_CATCH(ftape_ready_wait(ftape_timeout.pause, &status),);
while ((status & QIC_STATUS_AT_BOT) == 0) {
if (ftape_not_operational(status)) {
TRACE_EXIT -EIO;
}
TRACE_CATCH(ftape_command_wait(QIC_PHYSICAL_REVERSE,
ftape_timeout.rewind,&status),);
}
TRACE_EXIT 0;
}
static int ftape_new_cartridge(void)
{
ft_location.track = -1; /* force seek on first access */
ftape_zap_read_buffers();
ftape_zap_write_buffers();
return 0;
}
int ftape_abort_operation(void)
{
int result = 0;
int status;
TRACE_FUN(ft_t_flow);
if (ft_runner_status == running) {
TRACE(ft_t_noise, "aborting runner, waiting");
ft_runner_status = do_abort;
/* set timeout so that the tape will run to logical EOT
* if we missed the last sector and there are no queue pulses.
*/
result = ftape_dumb_stop();
}
if (ft_runner_status != idle) {
if (ft_runner_status == do_abort) {
TRACE(ft_t_noise, "forcing runner abort");
}
TRACE(ft_t_noise, "stopping tape");
result = ftape_stop_tape(&status);
ft_location.known = 0;
ft_runner_status = idle;
}
ftape_reset_buffer();
ftape_zap_read_buffers();
ftape_set_state(idle);
TRACE_EXIT result;
}
static int lookup_vendor_id(unsigned int vendor_id)
{
int i = 0;
while (vendors[i].vendor_id != vendor_id) {
if (++i >= NR_ITEMS(vendors)) {
return -1;
}
}
return i;
}
static void ftape_detach_drive(void)
{
TRACE_FUN(ft_t_any);
TRACE(ft_t_flow, "disabling tape drive and fdc");
ftape_put_drive_to_sleep(ft_drive_type.wake_up);
fdc_catch_stray_interrupts(1); /* one always comes */
fdc_disable();
fdc_release_irq_and_dma();
fdc_release_regions();
TRACE_EXIT;
}
static void clear_history(void)
{
ft_history.used = 0;
ft_history.id_am_errors =
ft_history.id_crc_errors =
ft_history.data_am_errors =
ft_history.data_crc_errors =
ft_history.overrun_errors =
ft_history.no_data_errors =
ft_history.retries =
ft_history.crc_errors =
ft_history.crc_failures =
ft_history.ecc_failures =
ft_history.corrected =
ft_history.defects =
ft_history.rewinds = 0;
}
static int ftape_activate_drive(vendor_struct * drive_type)
{
int result = 0;
TRACE_FUN(ft_t_flow);
/* If we already know the drive type, wake it up.
* Else try to find out what kind of drive is attached.
*/
if (drive_type->wake_up != unknown_wake_up) {
TRACE(ft_t_flow, "enabling tape drive and fdc");
result = ftape_wakeup_drive(drive_type->wake_up);
if (result < 0) {
TRACE(ft_t_err, "known wakeup method failed");
}
} else {
wake_up_types method;
const ft_trace_t old_tracing = TRACE_LEVEL;
if (TRACE_LEVEL < ft_t_flow) {
SET_TRACE_LEVEL(ft_t_bug);
}
/* Try to awaken the drive using all known methods.
* Lower tracing for a while.
*/
for (method=no_wake_up; method < NR_ITEMS(methods); ++method) {
drive_type->wake_up = method;
#ifdef CONFIG_FT_TWO_DRIVES
/* Test setup for dual drive configuration.
* /dev/rft2 uses mountain wakeup
* /dev/rft3 uses colorado wakeup
* Other systems will use the normal scheme.
*/
if ((ft_drive_sel < 2) ||
(ft_drive_sel == 2 && method == FT_WAKE_UP_1) ||
(ft_drive_sel == 3 && method == FT_WAKE_UP_2)) {
result=ftape_wakeup_drive(drive_type->wake_up);
} else {
result = -EIO;
}
#else
result = ftape_wakeup_drive(drive_type->wake_up);
#endif
if (result >= 0) {
TRACE(ft_t_warn, "drive wakeup method: %s",
methods[drive_type->wake_up].name);
break;
}
}
SET_TRACE_LEVEL(old_tracing);
if (method >= NR_ITEMS(methods)) {
/* no response at all, cannot open this drive */
drive_type->wake_up = unknown_wake_up;
TRACE(ft_t_err, "no tape drive found !");
result = -ENODEV;
}
}
TRACE_EXIT result;
}
static int ftape_get_drive_status(void)
{
int result;
int status;
TRACE_FUN(ft_t_flow);
ft_no_tape = ft_write_protected = 0;
/* Tape drive is activated now.
* First clear error status if present.
*/
do {
result = ftape_ready_wait(ftape_timeout.reset, &status);
if (result < 0) {
if (result == -ETIME) {
TRACE(ft_t_err, "ftape_ready_wait timeout");
} else if (result == -EINTR) {
TRACE(ft_t_err, "ftape_ready_wait aborted");
} else {
TRACE(ft_t_err, "ftape_ready_wait failed");
}
TRACE_EXIT -EIO;
}
/* Clear error condition (drive is ready !)
*/
if (status & QIC_STATUS_ERROR) {
unsigned int error;
qic117_cmd_t command;
TRACE(ft_t_err, "error status set");
result = ftape_report_error(&error, &command, 1);
if (result < 0) {
TRACE(ft_t_err,
"report_error_code failed: %d", result);
/* hope it's working next time */
ftape_reset_drive();
TRACE_EXIT -EIO;
} else if (error != 0) {
TRACE(ft_t_noise, "error code : %d", error);
TRACE(ft_t_noise, "error command: %d", command);
}
}
if (status & QIC_STATUS_NEW_CARTRIDGE) {
unsigned int error;
qic117_cmd_t command;
const ft_trace_t old_tracing = TRACE_LEVEL;
SET_TRACE_LEVEL(ft_t_bug);
/* Undocumented feature: Must clear (not present!)
* error here or we'll fail later.
*/
ftape_report_error(&error, &command, 1);
SET_TRACE_LEVEL(old_tracing);
TRACE(ft_t_info, "status: new cartridge");
ft_new_tape = 1;
} else {
ft_new_tape = 0;
}
FT_SIGNAL_EXIT(_DONT_BLOCK);
} while (status & QIC_STATUS_ERROR);
ft_no_tape = !(status & QIC_STATUS_CARTRIDGE_PRESENT);
ft_write_protected = (status & QIC_STATUS_WRITE_PROTECT) != 0;
if (ft_no_tape) {
TRACE(ft_t_warn, "no cartridge present");
} else {
if (ft_write_protected) {
TRACE(ft_t_noise, "Write protected cartridge");
}
}
TRACE_EXIT 0;
}
static void ftape_log_vendor_id(void)
{
int vendor_index;
TRACE_FUN(ft_t_flow);
ftape_report_vendor_id(&ft_drive_type.vendor_id);
vendor_index = lookup_vendor_id(ft_drive_type.vendor_id);
if (ft_drive_type.vendor_id == UNKNOWN_VENDOR &&
ft_drive_type.wake_up == wake_up_colorado) {
vendor_index = 0;
/* hack to get rid of all this mail */
ft_drive_type.vendor_id = 0;
}
if (vendor_index < 0) {
/* Unknown vendor id, first time opening device. The
* drive_type remains set to type found at wakeup
* time, this will probably keep the driver operating
* for this new vendor.
*/
TRACE(ft_t_warn, "\n"
KERN_INFO "============ unknown vendor id ===========\n"
KERN_INFO "A new, yet unsupported tape drive is found\n"
KERN_INFO "Please report the following values:\n"
KERN_INFO " Vendor id : 0x%04x\n"
KERN_INFO " Wakeup method : %s\n"
KERN_INFO "And a description of your tape drive\n"
KERN_INFO "to "THE_FTAPE_MAINTAINER"\n"
KERN_INFO "==========================================",
ft_drive_type.vendor_id,
methods[ft_drive_type.wake_up].name);
ft_drive_type.speed = 0; /* unknown */
} else {
ft_drive_type.name = vendors[vendor_index].name;
ft_drive_type.speed = vendors[vendor_index].speed;
TRACE(ft_t_info, "tape drive type: %s", ft_drive_type.name);
/* scan all methods for this vendor_id in table */
while(ft_drive_type.wake_up != vendors[vendor_index].wake_up) {
if (vendor_index < NR_ITEMS(vendors) - 1 &&
vendors[vendor_index + 1].vendor_id
==
ft_drive_type.vendor_id) {
++vendor_index;
} else {
break;
}
}
if (ft_drive_type.wake_up != vendors[vendor_index].wake_up) {
TRACE(ft_t_warn, "\n"
KERN_INFO "==========================================\n"
KERN_INFO "wakeup type mismatch:\n"
KERN_INFO "found: %s, expected: %s\n"
KERN_INFO "please report this to "THE_FTAPE_MAINTAINER"\n"
KERN_INFO "==========================================",
methods[ft_drive_type.wake_up].name,
methods[vendors[vendor_index].wake_up].name);
}
}
TRACE_EXIT;
}
void ftape_calc_timeouts(unsigned int qic_std,
unsigned int data_rate,
unsigned int tape_len)
{
int speed; /* deci-ips ! */
int ff_speed;
int length;
TRACE_FUN(ft_t_any);
/* tape transport speed
* data rate: QIC-40 QIC-80 QIC-3010 QIC-3020
*
* 250 Kbps 25 ips n/a n/a n/a
* 500 Kbps 50 ips 34 ips 22.6 ips n/a
* 1 Mbps n/a 68 ips 45.2 ips 22.6 ips
* 2 Mbps n/a n/a n/a 45.2 ips
*
* fast tape transport speed is at least 68 ips.
*/
switch (qic_std) {
case QIC_TAPE_QIC40:
speed = (data_rate == 250) ? 250 : 500;
break;
case QIC_TAPE_QIC80:
speed = (data_rate == 500) ? 340 : 680;
break;
case QIC_TAPE_QIC3010:
speed = (data_rate == 500) ? 226 : 452;
break;
case QIC_TAPE_QIC3020:
speed = (data_rate == 1000) ? 226 : 452;
break;
default:
TRACE(ft_t_bug, "Unknown qic_std (bug) ?");
speed = 500;
break;
}
if (ft_drive_type.speed == 0) {
unsigned long t0;
static int dt = 0; /* keep gcc from complaining */
static int first_time = 1;
/* Measure the time it takes to wind to EOT and back to BOT.
* If the tape length is known, calculate the rewind speed.
* Else keep the time value for calculation of the rewind
* speed later on, when the length _is_ known.
* Ask for a report only when length and speed are both known.
*/
if (first_time) {
ftape_seek_to_bot();
t0 = jiffies;
ftape_seek_to_eot();
ftape_seek_to_bot();
dt = (int) (((jiffies - t0) * FT_USPT) / 1000);
if (dt < 1) {
dt = 1; /* prevent div by zero on failures */
}
first_time = 0;
TRACE(ft_t_info,
"trying to determine seek timeout, got %d msec",
dt);
}
if (tape_len != 0) {
ft_drive_type.speed =
(2 * 12 * tape_len * 1000) / dt;
TRACE(ft_t_warn, "\n"
KERN_INFO "==========================================\n"
KERN_INFO "drive type: %s\n"
KERN_INFO "delta time = %d ms, length = %d ft\n"
KERN_INFO "has a maximum tape speed of %d ips\n"
KERN_INFO "please report this to "THE_FTAPE_MAINTAINER"\n"
KERN_INFO "==========================================",
ft_drive_type.name, dt, tape_len,
ft_drive_type.speed);
}
}
/* Handle unknown length tapes as very long ones. We'll
* determine the actual length from a header segment later.
* This is normal for all modern (Wide,TR1/2/3) formats.
*/
if (tape_len <= 0) {
TRACE(ft_t_noise,
"Unknown tape length, using maximal timeouts");
length = QIC_TOP_TAPE_LEN; /* use worst case values */
} else {
length = tape_len; /* use actual values */
}
if (ft_drive_type.speed == 0) {
ff_speed = speed;
} else {
ff_speed = ft_drive_type.speed;
}
/* time to go from bot to eot at normal speed (data rate):
* time = (1+delta) * length (ft) * 12 (inch/ft) / speed (ips)
* delta = 10 % for seek speed, 20 % for rewind speed.
*/
ftape_timeout.seek = (length * 132 * FT_SECOND) / speed;
ftape_timeout.rewind = (length * 144 * FT_SECOND) / (10 * ff_speed);
ftape_timeout.reset = 20 * FT_SECOND + ftape_timeout.rewind;
TRACE(ft_t_noise, "timeouts for speed = %d, length = %d\n"
KERN_INFO "seek timeout : %d sec\n"
KERN_INFO "rewind timeout: %d sec\n"
KERN_INFO "reset timeout : %d sec",
speed, length,
(ftape_timeout.seek + 500) / 1000,
(ftape_timeout.rewind + 500) / 1000,
(ftape_timeout.reset + 500) / 1000);
TRACE_EXIT;
}
/* This function calibrates the datarate (i.e. determines the maximal
* usable data rate) and sets the global variable ft_qic_std to qic_std
*
*/
int ftape_calibrate_data_rate(unsigned int qic_std)
{
int rate = ft_fdc_rate_limit;
int result;
TRACE_FUN(ft_t_flow);
ft_qic_std = qic_std;
if (ft_qic_std == -1) {
TRACE_ABORT(-EIO, ft_t_err,
"Unable to determine data rate if QIC standard is unknown");
}
/* Select highest rate supported by both fdc and drive.
* Start with highest rate supported by the fdc.
*/
while (fdc_set_data_rate(rate) < 0 && rate > 250) {
rate /= 2;
}
TRACE(ft_t_info,
"Highest FDC supported data rate: %d Kbps", rate);
ft_fdc_max_rate = rate;
do {
result = ftape_set_data_rate(rate, ft_qic_std);
} while (result == -EINVAL && (rate /= 2) > 250);
if (result < 0) {
TRACE_ABORT(-EIO, ft_t_err, "set datarate failed");
}
ft_data_rate = rate;
TRACE_EXIT 0;
}
static int ftape_init_drive(void)
{
int status;
qic_model model;
unsigned int qic_std;
unsigned int data_rate;
TRACE_FUN(ft_t_flow);
ftape_init_drive_needed = 0; /* don't retry if this fails ? */
TRACE_CATCH(ftape_report_raw_drive_status(&status),);
if (status & QIC_STATUS_CARTRIDGE_PRESENT) {
if (!(status & QIC_STATUS_AT_BOT)) {
/* Antique drives will get here after a soft reset,
* modern ones only if the driver is loaded when the
* tape wasn't rewound properly.
*/
/* Tape should be at bot if new cartridge ! */
ftape_seek_to_bot();
}
if (!(status & QIC_STATUS_REFERENCED)) {
TRACE(ft_t_flow, "starting seek_load_point");
TRACE_CATCH(ftape_command_wait(QIC_SEEK_LOAD_POINT,
ftape_timeout.reset,
&status),);
}
}
ft_formatted = (status & QIC_STATUS_REFERENCED) != 0;
if (!ft_formatted) {
TRACE(ft_t_warn, "Warning: tape is not formatted !");
}
/* report configuration aborts when ftape_tape_len == -1
* unknown qic_std is okay if not formatted.
*/
TRACE_CATCH(ftape_report_configuration(&model,
&data_rate,
&qic_std,
&ftape_tape_len),);
/* Maybe add the following to the /proc entry
*/
TRACE(ft_t_info, "%s drive @ %d Kbps",
(model == prehistoric) ? "prehistoric" :
((model == pre_qic117c) ? "pre QIC-117C" :
((model == post_qic117b) ? "post QIC-117B" :
"post QIC-117D")), data_rate);
if (ft_formatted) {
/* initialize ft_used_data_rate to maximum value
* and set ft_qic_std
*/
TRACE_CATCH(ftape_calibrate_data_rate(qic_std),);
if (ftape_tape_len == 0) {
TRACE(ft_t_info, "unknown length QIC-%s tape",
(ft_qic_std == QIC_TAPE_QIC40) ? "40" :
((ft_qic_std == QIC_TAPE_QIC80) ? "80" :
((ft_qic_std == QIC_TAPE_QIC3010)
? "3010" : "3020")));
} else {
TRACE(ft_t_info, "%d ft. QIC-%s tape", ftape_tape_len,
(ft_qic_std == QIC_TAPE_QIC40) ? "40" :
((ft_qic_std == QIC_TAPE_QIC80) ? "80" :
((ft_qic_std == QIC_TAPE_QIC3010)
? "3010" : "3020")));
}
ftape_calc_timeouts(ft_qic_std, ft_data_rate, ftape_tape_len);
/* soft write-protect QIC-40/QIC-80 cartridges used with a
* Colorado T3000 drive. Buggy hardware!
*/
if ((ft_drive_type.vendor_id == 0x011c6) &&
((ft_qic_std == QIC_TAPE_QIC40 ||
ft_qic_std == QIC_TAPE_QIC80) &&
!ft_write_protected)) {
TRACE(ft_t_warn, "\n"
KERN_INFO "The famous Colorado T3000 bug:\n"
KERN_INFO "%s drives can't write QIC40 and QIC80\n"
KERN_INFO "cartridges but don't set the write-protect flag!",
ft_drive_type.name);
ft_write_protected = 1;
}
} else {
/* Doesn't make too much sense to set the data rate
* because we don't know what to use for the write
* precompensation.
* Need to do this again when formatting the cartridge.
*/
ft_data_rate = data_rate;
ftape_calc_timeouts(QIC_TAPE_QIC40,
data_rate,
ftape_tape_len);
}
ftape_new_cartridge();
TRACE_EXIT 0;
}
static void ftape_munmap(void)
{
int i;
TRACE_FUN(ft_t_flow);
for (i = 0; i < ft_nr_buffers; i++) {
ft_buffer[i]->mmapped = 0;
}
TRACE_EXIT;
}
/* Map the dma buffers into the virtual address range given by vma.
* We only check the caller doesn't map non-existent buffers. We
* don't check for multiple mappings.
*/
int ftape_mmap(struct vm_area_struct *vma)
{
int num_buffers;
int i;
TRACE_FUN(ft_t_flow);
if (ft_failure) {
TRACE_EXIT -ENODEV;
}
if (!(vma->vm_flags & (VM_READ|VM_WRITE))) {
TRACE_ABORT(-EINVAL, ft_t_err, "Undefined mmap() access");
}
if (vma_get_pgoff(vma) != 0) {
TRACE_ABORT(-EINVAL, ft_t_err, "page offset must be 0");
}
if ((vma->vm_end - vma->vm_start) % FT_BUFF_SIZE != 0) {
TRACE_ABORT(-EINVAL, ft_t_err,
"size = %ld, should be a multiple of %d",
vma->vm_end - vma->vm_start,
FT_BUFF_SIZE);
}
num_buffers = (vma->vm_end - vma->vm_start) / FT_BUFF_SIZE;
if (num_buffers > ft_nr_buffers) {
TRACE_ABORT(-EINVAL,
ft_t_err, "size = %ld, should be less than %d",
vma->vm_end - vma->vm_start,
ft_nr_buffers * FT_BUFF_SIZE);
}
if (ft_driver_state != idle) {
/* this also clears the buffer states
*/
ftape_abort_operation();
} else {
ftape_reset_buffer();
}
for (i = 0; i < num_buffers; i++) {
unsigned long pfn;
pfn = virt_to_phys(ft_buffer[i]->address) >> PAGE_SHIFT;
TRACE_CATCH(remap_pfn_range(vma, vma->vm_start +
i * FT_BUFF_SIZE,
pfn,
FT_BUFF_SIZE,
vma->vm_page_prot),
_res = -EAGAIN);
TRACE(ft_t_noise, "remapped dma buffer @ %p to location @ %p",
ft_buffer[i]->address,
(void *)(vma->vm_start + i * FT_BUFF_SIZE));
}
for (i = 0; i < num_buffers; i++) {
memset(ft_buffer[i]->address, 0xAA, FT_BUFF_SIZE);
ft_buffer[i]->mmapped++;
}
TRACE_EXIT 0;
}
static void ftape_init_driver(void); /* forward declaration */
/* OPEN routine called by kernel-interface code
*/
int ftape_enable(int drive_selection)
{
TRACE_FUN(ft_t_any);
if (ft_drive_sel == -1 || ft_drive_sel != drive_selection) {
/* Other selection than last time
*/
ftape_init_driver();
}
ft_drive_sel = FTAPE_SEL(drive_selection);
ft_failure = 0;
TRACE_CATCH(fdc_init(),); /* init & detect fdc */
TRACE_CATCH(ftape_activate_drive(&ft_drive_type),
fdc_disable();
fdc_release_irq_and_dma();
fdc_release_regions());
TRACE_CATCH(ftape_get_drive_status(), ftape_detach_drive());
if (ft_drive_type.vendor_id == UNKNOWN_VENDOR) {
ftape_log_vendor_id();
}
if (ft_new_tape) {
ftape_init_drive_needed = 1;
}
if (!ft_no_tape && ftape_init_drive_needed) {
TRACE_CATCH(ftape_init_drive(), ftape_detach_drive());
}
ftape_munmap(); /* clear the mmap flag */
clear_history();
TRACE_EXIT 0;
}
/* release routine called by the high level interface modules
* zftape or sftape.
*/
void ftape_disable(void)
{
int i;
TRACE_FUN(ft_t_any);
for (i = 0; i < ft_nr_buffers; i++) {
if (ft_buffer[i]->mmapped) {
TRACE(ft_t_noise, "first byte of buffer %d: 0x%02x",
i, *ft_buffer[i]->address);
}
}
if (sigtestsetmask(&current->pending.signal, _DONT_BLOCK) &&
!(sigtestsetmask(&current->pending.signal, _NEVER_BLOCK)) &&
ftape_tape_running) {
TRACE(ft_t_warn,
"Interrupted by fatal signal and tape still running");
ftape_dumb_stop();
ftape_abort_operation(); /* it's annoying */
} else {
ftape_set_state(idle);
}
ftape_detach_drive();
if (ft_history.used) {
TRACE(ft_t_info, "== Non-fatal errors this run: ==");
TRACE(ft_t_info, "fdc isr statistics:\n"
KERN_INFO " id_am_errors : %3d\n"
KERN_INFO " id_crc_errors : %3d\n"
KERN_INFO " data_am_errors : %3d\n"
KERN_INFO " data_crc_errors : %3d\n"
KERN_INFO " overrun_errors : %3d\n"
KERN_INFO " no_data_errors : %3d\n"
KERN_INFO " retries : %3d",
ft_history.id_am_errors, ft_history.id_crc_errors,
ft_history.data_am_errors, ft_history.data_crc_errors,
ft_history.overrun_errors, ft_history.no_data_errors,
ft_history.retries);
if (ft_history.used & 1) {
TRACE(ft_t_info, "ecc statistics:\n"
KERN_INFO " crc_errors : %3d\n"
KERN_INFO " crc_failures : %3d\n"
KERN_INFO " ecc_failures : %3d\n"
KERN_INFO " sectors corrected: %3d",
ft_history.crc_errors, ft_history.crc_failures,
ft_history.ecc_failures, ft_history.corrected);
}
if (ft_history.defects > 0) {
TRACE(ft_t_warn, "Warning: %d media defects!",
ft_history.defects);
}
if (ft_history.rewinds > 0) {
TRACE(ft_t_info, "tape motion statistics:\n"
KERN_INFO "repositions : %3d",
ft_history.rewinds);
}
}
ft_failure = 1;
TRACE_EXIT;
}
static void ftape_init_driver(void)
{
TRACE_FUN(ft_t_flow);
ft_drive_type.vendor_id = UNKNOWN_VENDOR;
ft_drive_type.speed = 0;
ft_drive_type.wake_up = unknown_wake_up;
ft_drive_type.name = "Unknown";
ftape_timeout.seek = 650 * FT_SECOND;
ftape_timeout.reset = 670 * FT_SECOND;
ftape_timeout.rewind = 650 * FT_SECOND;
ftape_timeout.head_seek = 15 * FT_SECOND;
ftape_timeout.stop = 5 * FT_SECOND;
ftape_timeout.pause = 16 * FT_SECOND;
ft_qic_std = -1;
ftape_tape_len = 0; /* unknown */
ftape_current_command = 0;
ftape_current_cylinder = -1;
ft_segments_per_track = 102;
ftape_segments_per_head = 1020;
ftape_segments_per_cylinder = 4;
ft_tracks_per_tape = 20;
ft_failure = 1;
ft_formatted = 0;
ft_no_tape = 1;
ft_write_protected = 1;
ft_new_tape = 1;
ft_driver_state = idle;
ft_data_rate =
ft_fdc_max_rate = 500;
ft_drive_max_rate = 0; /* triggers set_rate_test() */
ftape_init_drive_needed = 1;
ft_header_segment_1 = -1;
ft_header_segment_2 = -1;
ft_used_header_segment = -1;
ft_first_data_segment = -1;
ft_last_data_segment = -1;
ft_location.track = -1;
ft_location.known = 0;
ftape_tape_running = 0;
ftape_might_be_off_track = 1;
ftape_new_cartridge(); /* init some tape related variables */
ftape_init_bsm();
TRACE_EXIT;
}
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