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;
}
/* Output a cmd_len long command string to the FDC.
* The FDC should be ready to receive a new command or
* an error (EBUSY or ETIME) will occur.
*/
int fdc_command(const __u8 * cmd_data, int cmd_len)
{
int result = 0;
unsigned long flags;
int count = cmd_len;
int retry = 0;
#ifdef TESTING
static unsigned int last_time;
unsigned int time;
#endif
TRACE_FUN(ft_t_any);
fdc_usec_wait(FT_RQM_DELAY); /* wait for valid RQM status */
spin_lock_irqsave(&fdc_io_lock, flags);
if (!in_interrupt())
/* Yes, I know, too much comments inside this function
* ...
*
* Yet another bug in the original driver. All that
* havoc is caused by the fact that the isr() sends
* itself a command to the floppy tape driver (pause,
* micro step pause). Now, the problem is that
* commands are transmitted via the fdc_seek
* command. But: the fdc performs seeks in the
* background i.e. it doesn't signal busy while
* sending the step pulses to the drive. Therefore the
* non-interrupt level driver has no chance to tell
* whether the isr() just has issued a seek. Therefore
* we HAVE TO have a look at the ft_hide_interrupt
* flag: it signals the non-interrupt level part of
* the driver that it has to wait for the fdc until it
* has completet seeking.
*
* THIS WAS PRESUMABLY THE REASON FOR ALL THAT
* "fdc_read timeout" errors, I HOPE :-)
*/
if (ft_hide_interrupt) {
restore_flags(flags);
TRACE(ft_t_info,
"Waiting for the isr() completing fdc_seek()");
if (fdc_interrupt_wait(2 * FT_SECOND) < 0) {
TRACE(ft_t_warn,
"Warning: timeout waiting for isr() seek to complete");
}
if (ft_hide_interrupt || !ft_seek_completed) {
/* There cannot be another
* interrupt. The isr() only stops
* the tape and the next interrupt
* won't come until we have send our
* command to the drive.
*/
TRACE_ABORT(-EIO, ft_t_bug,
"BUG? isr() is still seeking?\n"
KERN_INFO "hide: %d\n"
KERN_INFO "seek: %d",
ft_hide_interrupt,
ft_seek_completed);
}
fdc_usec_wait(FT_RQM_DELAY); /* wait for valid RQM status */
spin_lock_irqsave(&fdc_io_lock, flags);
}
fdc_status = inb(fdc.msr);
if ((fdc_status & FDC_DATA_READY_MASK) != FDC_DATA_IN_READY) {
spin_unlock_irqrestore(&fdc_io_lock, flags);
TRACE_ABORT(-EBUSY, ft_t_err, "fdc not ready");
}
fdc_mode = *cmd_data; /* used by isr */
#ifdef TESTING
if (fdc_mode == FDC_SEEK) {
time = ftape_timediff(last_time, ftape_timestamp());
if (time < 6000) {
TRACE(ft_t_bug,"Warning: short timeout between seek commands: %d",
time);
}
}
#endif
if (!in_interrupt()) {
/* shouldn't be cleared if called from isr
*/
ft_interrupt_seen = 0;
}
while (count) {
result = fdc_write(*cmd_data);
if (result < 0) {
TRACE(ft_t_fdc_dma,
"fdc_mode = %02x, status = %02x at index %d",
(int) fdc_mode, (int) fdc_status,
cmd_len - count);
if (++retry <= 3) {
TRACE(ft_t_warn, "fdc_write timeout, retry");
} else {
TRACE(ft_t_err, "fdc_write timeout, fatal");
/* recover ??? */
break;
}
} else {
--count;
++cmd_data;
}
}
#ifdef TESTING
if (fdc_mode == FDC_SEEK) {
last_time = ftape_timestamp();
}
#endif
spin_unlock_irqrestore(&fdc_io_lock, flags);
TRACE_EXIT result;
}
