2 * Copyright (C) 1993-1996 Bas Laarhoven,
3 * (C) 1996-1997 Claus-Justus Heine.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; see the file COPYING. If not, write to
17 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
20 * $Source: /homes/cvs/ftape-stacked/ftape/lowlevel/fdc-io.c,v $
21 * $Revision: 1.7.4.2 $
22 * $Date: 1997/11/16 14:48:17 $
24 * This file contains the low-level floppy disk interface code
25 * for the QIC-40/80/3010/3020 floppy-tape driver "ftape" for
29 #include <linux/config.h> /* for CONFIG_FT_* */
30 #include <linux/errno.h>
31 #include <linux/sched.h>
32 #include <linux/ioport.h>
33 #include <linux/interrupt.h>
34 #include <linux/kernel.h>
35 #include <asm/system.h>
40 #include <linux/ftape.h>
41 #include <linux/qic117.h>
42 #include "../lowlevel/ftape-tracing.h"
43 #include "../lowlevel/fdc-io.h"
44 #include "../lowlevel/fdc-isr.h"
45 #include "../lowlevel/ftape-io.h"
46 #include "../lowlevel/ftape-rw.h"
47 #include "../lowlevel/ftape-ctl.h"
48 #include "../lowlevel/ftape-calibr.h"
49 #include "../lowlevel/fc-10.h"
53 static int ftape_motor;
54 volatile int ftape_current_cylinder = -1;
55 volatile fdc_mode_enum fdc_mode = fdc_idle;
57 DECLARE_WAIT_QUEUE_HEAD(ftape_wait_intr);
59 unsigned int ft_fdc_base = CONFIG_FT_FDC_BASE;
60 unsigned int ft_fdc_irq = CONFIG_FT_FDC_IRQ;
61 unsigned int ft_fdc_dma = CONFIG_FT_FDC_DMA;
62 unsigned int ft_fdc_threshold = CONFIG_FT_FDC_THR; /* bytes */
63 unsigned int ft_fdc_rate_limit = CONFIG_FT_FDC_MAX_RATE; /* bits/sec */
64 int ft_probe_fc10 = CONFIG_FT_PROBE_FC10;
65 int ft_mach2 = CONFIG_FT_MACH2;
69 static spinlock_t fdc_io_lock;
70 static unsigned int fdc_calibr_count;
71 static unsigned int fdc_calibr_time;
72 static int fdc_status;
73 volatile __u8 fdc_head; /* FDC head from sector id */
74 volatile __u8 fdc_cyl; /* FDC track from sector id */
75 volatile __u8 fdc_sect; /* FDC sector from sector id */
76 static int fdc_data_rate = 500; /* data rate (Kbps) */
77 static int fdc_rate_code; /* data rate code (0 == 500 Kbps) */
78 static int fdc_seek_rate = 2; /* step rate (msec) */
79 static void (*do_ftape) (void);
80 static int fdc_fifo_state; /* original fifo setting - fifo enabled */
81 static int fdc_fifo_thr; /* original fifo setting - threshold */
82 static int fdc_lock_state; /* original lock setting - locked */
83 static int fdc_fifo_locked; /* has fifo && lock set ? */
84 static __u8 fdc_precomp; /* default precomp. value (nsec) */
85 static __u8 fdc_prec_code; /* fdc precomp. select code */
87 static char ftape_id[] = "ftape"; /* used by request irq and free irq */
89 static int fdc_set_seek_rate(int seek_rate);
91 void fdc_catch_stray_interrupts(int count)
95 spin_lock_irqsave(&fdc_io_lock, flags);
97 ft_expected_stray_interrupts = 0;
99 ft_expected_stray_interrupts += count;
101 spin_unlock_irqrestore(&fdc_io_lock, flags);
104 /* Wait during a timeout period for a given FDC status.
105 * If usecs == 0 then just test status, else wait at least for usecs.
106 * Returns -ETIME on timeout. Function must be calibrated first !
108 static int fdc_wait(unsigned int usecs, __u8 mask, __u8 state)
110 int count_1 = (fdc_calibr_count * usecs +
111 fdc_calibr_count - 1) / fdc_calibr_time;
114 fdc_status = inb_p(fdc.msr);
115 if ((fdc_status & mask) == state) {
118 } while (count_1-- >= 0);
122 int fdc_ready_wait(unsigned int usecs)
124 return fdc_wait(usecs, FDC_DATA_READY | FDC_BUSY, FDC_DATA_READY);
127 /* Why can't we just use udelay()?
129 static void fdc_usec_wait(unsigned int usecs)
131 fdc_wait(usecs, 0, 1); /* will always timeout ! */
134 static int fdc_ready_out_wait(unsigned int usecs)
136 fdc_usec_wait(FT_RQM_DELAY); /* wait for valid RQM status */
137 return fdc_wait(usecs, FDC_DATA_OUT_READY, FDC_DATA_OUT_READY);
140 void fdc_wait_calibrate(void)
142 ftape_calibrate("fdc_wait",
143 fdc_usec_wait, &fdc_calibr_count, &fdc_calibr_time);
146 /* Wait for a (short) while for the FDC to become ready
147 * and transfer the next command byte.
148 * Return -ETIME on timeout on getting ready (depends on hardware!).
150 static int fdc_write(const __u8 data)
152 fdc_usec_wait(FT_RQM_DELAY); /* wait for valid RQM status */
153 if (fdc_wait(150, FDC_DATA_READY_MASK, FDC_DATA_IN_READY) < 0) {
156 outb(data, fdc.fifo);
161 /* Wait for a (short) while for the FDC to become ready
162 * and transfer the next result byte.
163 * Return -ETIME if timeout on getting ready (depends on hardware!).
165 static int fdc_read(__u8 * data)
167 fdc_usec_wait(FT_RQM_DELAY); /* wait for valid RQM status */
168 if (fdc_wait(150, FDC_DATA_READY_MASK, FDC_DATA_OUT_READY) < 0) {
171 *data = inb(fdc.fifo);
176 /* Output a cmd_len long command string to the FDC.
177 * The FDC should be ready to receive a new command or
178 * an error (EBUSY or ETIME) will occur.
180 int fdc_command(const __u8 * cmd_data, int cmd_len)
187 static unsigned int last_time;
192 fdc_usec_wait(FT_RQM_DELAY); /* wait for valid RQM status */
193 spin_lock_irqsave(&fdc_io_lock, flags);
195 /* Yes, I know, too much comments inside this function
198 * Yet another bug in the original driver. All that
199 * havoc is caused by the fact that the isr() sends
200 * itself a command to the floppy tape driver (pause,
201 * micro step pause). Now, the problem is that
202 * commands are transmitted via the fdc_seek
203 * command. But: the fdc performs seeks in the
204 * background i.e. it doesn't signal busy while
205 * sending the step pulses to the drive. Therefore the
206 * non-interrupt level driver has no chance to tell
207 * whether the isr() just has issued a seek. Therefore
208 * we HAVE TO have a look at the ft_hide_interrupt
209 * flag: it signals the non-interrupt level part of
210 * the driver that it has to wait for the fdc until it
211 * has completet seeking.
213 * THIS WAS PRESUMABLY THE REASON FOR ALL THAT
214 * "fdc_read timeout" errors, I HOPE :-)
216 if (ft_hide_interrupt) {
217 restore_flags(flags);
219 "Waiting for the isr() completing fdc_seek()");
220 if (fdc_interrupt_wait(2 * FT_SECOND) < 0) {
222 "Warning: timeout waiting for isr() seek to complete");
224 if (ft_hide_interrupt || !ft_seek_completed) {
225 /* There cannot be another
226 * interrupt. The isr() only stops
227 * the tape and the next interrupt
228 * won't come until we have send our
229 * command to the drive.
231 TRACE_ABORT(-EIO, ft_t_bug,
232 "BUG? isr() is still seeking?\n"
233 KERN_INFO "hide: %d\n"
234 KERN_INFO "seek: %d",
239 fdc_usec_wait(FT_RQM_DELAY); /* wait for valid RQM status */
240 spin_lock_irqsave(&fdc_io_lock, flags);
242 fdc_status = inb(fdc.msr);
243 if ((fdc_status & FDC_DATA_READY_MASK) != FDC_DATA_IN_READY) {
244 spin_unlock_irqrestore(&fdc_io_lock, flags);
245 TRACE_ABORT(-EBUSY, ft_t_err, "fdc not ready");
247 fdc_mode = *cmd_data; /* used by isr */
249 if (fdc_mode == FDC_SEEK) {
250 time = ftape_timediff(last_time, ftape_timestamp());
252 TRACE(ft_t_bug,"Warning: short timeout between seek commands: %d",
257 if (!in_interrupt()) {
258 /* shouldn't be cleared if called from isr
260 ft_interrupt_seen = 0;
263 result = fdc_write(*cmd_data);
266 "fdc_mode = %02x, status = %02x at index %d",
267 (int) fdc_mode, (int) fdc_status,
270 TRACE(ft_t_warn, "fdc_write timeout, retry");
272 TRACE(ft_t_err, "fdc_write timeout, fatal");
282 if (fdc_mode == FDC_SEEK) {
283 last_time = ftape_timestamp();
286 spin_unlock_irqrestore(&fdc_io_lock, flags);
290 /* Input a res_len long result string from the FDC.
291 * The FDC should be ready to send the result or an error
292 * (EBUSY or ETIME) will occur.
294 int fdc_result(__u8 * res_data, int res_len)
302 spin_lock_irqsave(&fdc_io_lock, flags);
303 fdc_status = inb(fdc.msr);
304 if ((fdc_status & FDC_DATA_READY_MASK) != FDC_DATA_OUT_READY) {
305 TRACE(ft_t_err, "fdc not ready");
307 } else while (count) {
308 if (!(fdc_status & FDC_BUSY)) {
309 spin_unlock_irqrestore(&fdc_io_lock, flags);
310 TRACE_ABORT(-EIO, ft_t_err, "premature end of result phase");
312 result = fdc_read(res_data);
315 "fdc_mode = %02x, status = %02x at index %d",
320 TRACE(ft_t_warn, "fdc_read timeout, retry");
322 TRACE(ft_t_err, "fdc_read timeout, fatal");
332 spin_unlock_irqrestore(&fdc_io_lock, flags);
333 fdc_usec_wait(FT_RQM_DELAY); /* allow FDC to negate BSY */
337 /* Handle command and result phases for
338 * commands without data phase.
340 static int fdc_issue_command(const __u8 * out_data, int out_count,
341 __u8 * in_data, int in_count)
346 TRACE_CATCH(fdc_command(out_data, out_count),);
348 /* will take 24 - 30 usec for fdc_sense_drive_status and
349 * fdc_sense_interrupt_status commands.
350 * 35 fails sometimes (5/9/93 SJL)
351 * On a loaded system it incidentally takes longer than
352 * this for the fdc to get ready ! ?????? WHY ??????
353 * So until we know what's going on use a very long timeout.
355 TRACE_CATCH(fdc_ready_out_wait(500 /* usec */),);
357 TRACE_CATCH(fdc_result(in_data, in_count),
358 TRACE(ft_t_err, "result phase aborted"));
363 /* Wait for FDC interrupt with timeout (in milliseconds).
364 * Signals are blocked so the wait will not be aborted.
365 * Note: interrupts must be enabled ! (23/05/93 SJL)
367 int fdc_interrupt_wait(unsigned int time)
369 DECLARE_WAITQUEUE(wait,current);
370 sigset_t old_sigmask;
371 static int resetting;
374 TRACE_FUN(ft_t_fdc_dma);
376 if (waitqueue_active(&ftape_wait_intr)) {
377 TRACE_ABORT(-EIO, ft_t_err, "error: nested call");
379 /* timeout time will be up to USPT microseconds too long ! */
380 timeout = (1000 * time + FT_USPT - 1) / FT_USPT;
382 spin_lock_irq(¤t->sighand->siglock);
383 old_sigmask = current->blocked;
384 sigfillset(¤t->blocked);
386 spin_unlock_irq(¤t->sighand->siglock);
388 set_current_state(TASK_INTERRUPTIBLE);
389 add_wait_queue(&ftape_wait_intr, &wait);
390 while (!ft_interrupt_seen && (current->state == TASK_INTERRUPTIBLE)) {
391 timeout = schedule_timeout(timeout);
394 spin_lock_irq(¤t->sighand->siglock);
395 current->blocked = old_sigmask;
397 spin_unlock_irq(¤t->sighand->siglock);
399 remove_wait_queue(&ftape_wait_intr, &wait);
400 /* the following IS necessary. True: as well
401 * wake_up_interruptible() as the schedule() set TASK_RUNNING
402 * when they wakeup a task, BUT: it may very well be that
403 * ft_interrupt_seen is already set to 1 when we enter here
404 * in which case schedule() gets never called, and
405 * TASK_RUNNING never set. This has the funny effect that we
406 * execute all the code until we leave kernel space, but then
407 * the task is stopped (a task CANNOT be preempted while in
408 * kernel mode. Sending a pair of SIGSTOP/SIGCONT to the
409 * tasks wakes it up again. Funny! :-)
411 current->state = TASK_RUNNING;
412 if (ft_interrupt_seen) { /* woken up by interrupt */
413 ft_interrupt_seen = 0;
417 * In first instance, next statement seems unnecessary since
418 * it will be cleared in fdc_command. However, a small part of
419 * the software seems to rely on this being cleared here
420 * (ftape_close might fail) so stick to it until things get fixed !
422 /* My deeply sought of knowledge:
423 * Behold NO! It is obvious. fdc_reset() doesn't call fdc_command()
424 * but nevertheless uses fdc_interrupt_wait(). OF COURSE this needs to
427 ft_interrupt_seen = 0; /* clear for next call */
429 resetting = 1; /* break infinite recursion if reset fails */
430 TRACE(ft_t_any, "cleanup reset");
434 TRACE_EXIT (signal_pending(current)) ? -EINTR : -ETIME;
437 /* Start/stop drive motor. Enable DMA mode.
439 void fdc_motor(int motor)
441 int unit = ft_drive_sel;
442 int data = unit | FDC_RESET_NOT | FDC_DMA_MODE;
447 data |= FDC_MOTOR_0 << unit;
448 TRACE(ft_t_noise, "turning motor %d on", unit);
450 TRACE(ft_t_noise, "turning motor %d off", unit);
453 outb_p(data, fdc.dor2);
455 outb_p(data, fdc.dor);
457 ftape_sleep(10 * FT_MILLISECOND);
461 static void fdc_update_dsr(void)
465 TRACE(ft_t_flow, "rate = %d Kbps, precomp = %d ns",
466 fdc_data_rate, fdc_precomp);
467 if (fdc.type >= i82077) {
468 outb_p((fdc_rate_code & 0x03) | fdc_prec_code, fdc.dsr);
470 outb_p(fdc_rate_code & 0x03, fdc.ccr);
475 void fdc_set_write_precomp(int precomp)
479 TRACE(ft_t_noise, "New precomp: %d nsec", precomp);
480 fdc_precomp = precomp;
481 /* write precompensation can be set in multiples of 41.67 nsec.
482 * round the parameter to the nearest multiple and convert it
483 * into a fdc setting. Note that 0 means default to the fdc,
484 * 7 is used instead of that.
486 fdc_prec_code = ((fdc_precomp + 21) / 42) << 2;
487 if (fdc_prec_code == 0 || fdc_prec_code > (6 << 2)) {
488 fdc_prec_code = 7 << 2;
494 /* Reprogram the 82078 registers to use Data Rate Table 1 on all drives.
496 static void fdc_set_drive_specs(void)
498 __u8 cmd[] = { FDC_DRIVE_SPEC, 0x00, 0x00, 0x00, 0x00, 0xc0};
502 TRACE(ft_t_flow, "Setting of drive specs called");
503 if (fdc.type >= i82078_1) {
504 cmd[1] = (0 << 5) | (2 << 2);
505 cmd[2] = (1 << 5) | (2 << 2);
506 cmd[3] = (2 << 5) | (2 << 2);
507 cmd[4] = (3 << 5) | (2 << 2);
508 result = fdc_command(cmd, NR_ITEMS(cmd));
510 TRACE(ft_t_err, "Setting of drive specs failed");
516 /* Select clock for fdc, must correspond with tape drive setting !
517 * This also influences the fdc timing so we must adjust some values.
519 int fdc_set_data_rate(int rate)
524 /* Select clock for fdc, must correspond with tape drive setting !
525 * This also influences the fdc timing so we must adjust some values.
527 TRACE(ft_t_fdc_dma, "new rate = %d", rate);
530 fdc_rate_code = fdc_data_rate_250;
533 fdc_rate_code = fdc_data_rate_500;
536 if (fdc.type < i82077) {
539 fdc_rate_code = fdc_data_rate_1000;
543 if (fdc.type < i82078_1) {
546 fdc_rate_code = fdc_data_rate_2000;
554 ft_t_fdc_dma, "%d is not a valid data rate", rate);
556 fdc_data_rate = rate;
558 fdc_set_seek_rate(fdc_seek_rate); /* clock changed! */
563 /* keep the unit select if keep_select is != 0,
565 static void fdc_dor_reset(int keep_select)
567 __u8 fdc_ctl = ft_drive_sel;
569 if (keep_select != 0) {
570 fdc_ctl |= FDC_DMA_MODE;
572 fdc_ctl |= FDC_MOTOR_0 << ft_drive_sel;
575 ftape_udelay(10); /* ??? but seems to be necessary */
577 outb_p(fdc_ctl & 0x0f, fdc.dor);
578 outb_p(fdc_ctl, fdc.dor2);
580 outb_p(fdc_ctl, fdc.dor);
582 fdc_usec_wait(10); /* delay >= 14 fdc clocks */
583 if (keep_select == 0) {
586 fdc_ctl |= FDC_RESET_NOT;
588 outb_p(fdc_ctl & 0x0f, fdc.dor);
589 outb_p(fdc_ctl, fdc.dor2);
591 outb_p(fdc_ctl, fdc.dor);
595 /* Reset the floppy disk controller. Leave the ftape_unit selected.
605 spin_lock_irqsave(&fdc_io_lock, flags);
607 fdc_dor_reset(1); /* keep unit selected */
611 /* maybe the cli()/sti() pair is not necessary, BUT:
612 * the following line MUST be here. Otherwise fdc_interrupt_wait()
613 * won't wait. Note that fdc_reset() is called from
614 * ftape_dumb_stop() when the fdc is busy transferring data. In this
615 * case fdc_isr() MOST PROBABLY sets ft_interrupt_seen, and tries
616 * to get the result bytes from the fdc etc. CLASH.
618 ft_interrupt_seen = 0;
622 fdc_update_dsr(); /* restore data rate and precomp */
624 spin_unlock_irqrestore(&fdc_io_lock, flags);
627 * Wait for first polling cycle to complete
629 if (fdc_interrupt_wait(1 * FT_SECOND) < 0) {
630 TRACE(ft_t_err, "no drive polling interrupt!");
631 } else { /* clear all disk-changed statuses */
632 for (i = 0; i < 4; ++i) {
633 if(fdc_sense_interrupt_status(&st0, &dummy) != 0) {
634 TRACE(ft_t_err, "sense failed for %d", i);
636 if (i == ft_drive_sel) {
637 ftape_current_cylinder = dummy;
640 TRACE(ft_t_noise, "drive polling completed");
645 fdc_set_seek_rate(fdc_seek_rate);
647 * DRIVE SPECIFICATION COMMAND (if fdc type known)
649 if (fdc.type >= i82078_1) {
650 fdc_set_drive_specs();
655 #if !defined(CLK_48MHZ)
659 /* When we're done, put the fdc into reset mode so that the regular
660 * floppy disk driver will figure out that something is wrong and
661 * initialize the controller the way it wants.
663 void fdc_disable(void)
665 __u8 cmd1[] = {FDC_CONFIGURE, 0x00, 0x00, 0x00};
666 __u8 cmd2[] = {FDC_LOCK};
667 __u8 cmd3[] = {FDC_UNLOCK};
669 TRACE_FUN(ft_t_flow);
671 if (!fdc_fifo_locked) {
675 if (fdc_issue_command(cmd3, 1, stat, 1) < 0 || stat[0] != 0x00) {
677 TRACE_ABORT(/**/, ft_t_bug,
678 "couldn't unlock fifo, configuration remains changed");
681 if (CLK_48MHZ && fdc.type >= i82078) {
682 cmd1[0] |= FDC_CLK48_BIT;
684 cmd1[2] = ((fdc_fifo_state) ? 0 : 0x20) + (fdc_fifo_thr - 1);
685 if (fdc_command(cmd1, NR_ITEMS(cmd1)) < 0) {
687 TRACE_ABORT(/**/, ft_t_bug,
688 "couldn't reconfigure fifo to old state");
690 if (fdc_lock_state &&
691 fdc_issue_command(cmd2, 1, stat, 1) < 0) {
693 TRACE_ABORT(/**/, ft_t_bug, "couldn't lock old state again");
695 TRACE(ft_t_noise, "fifo restored: %sabled, thr. %d, %slocked",
696 fdc_fifo_state ? "en" : "dis",
697 fdc_fifo_thr, (fdc_lock_state) ? "" : "not ");
702 /* Specify FDC seek-rate (milliseconds)
704 static int fdc_set_seek_rate(int seek_rate)
706 /* set step rate, dma mode, and minimal head load and unload times
708 __u8 in[3] = { FDC_SPECIFY, 1, (1 << 1)};
710 fdc_seek_rate = seek_rate;
711 in[1] |= (16 - (fdc_data_rate * fdc_seek_rate) / 500) << 4;
713 return fdc_command(in, 3);
716 /* Sense drive status: get unit's drive status (ST3)
718 int fdc_sense_drive_status(int *st3)
725 out[1] = ft_drive_sel;
726 TRACE_CATCH(fdc_issue_command(out, 2, in, 1),);
731 /* Sense Interrupt Status command:
732 * should be issued at the end of each seek.
733 * get ST0 and current cylinder.
735 int fdc_sense_interrupt_status(int *st0, int *current_cylinder)
742 TRACE_CATCH(fdc_issue_command(out, 1, in, 2),);
744 *current_cylinder = in[1];
750 int fdc_seek(int track)
760 out[1] = ft_drive_sel;
763 time = ftape_timestamp();
765 /* We really need this command to work !
767 ft_seek_completed = 0;
768 TRACE_CATCH(fdc_command(out, 3),
770 TRACE(ft_t_noise, "destination was: %d, resetting FDC...",
772 /* Handle interrupts until ft_seek_completed or timeout.
775 TRACE_CATCH(fdc_interrupt_wait(2 * FT_SECOND),);
776 if (ft_seek_completed) {
777 TRACE_CATCH(fdc_sense_interrupt_status(&st0, &pcn),);
778 if ((st0 & ST0_SEEK_END) == 0) {
779 TRACE_ABORT(-EIO, ft_t_err,
780 "no seek-end after seek completion !??");
786 time = ftape_timediff(time, ftape_timestamp()) / abs(track - ftape_current_cylinder);
787 if ((time < 900 || time > 3100) && abs(track - ftape_current_cylinder) > 5) {
788 TRACE(ft_t_warn, "Wrong FDC STEP interval: %d usecs (%d)",
789 time, track - ftape_current_cylinder);
792 /* Verify whether we issued the right tape command.
794 /* Verify that we seek to the proper track. */
796 TRACE_ABORT(-EIO, ft_t_err, "bad seek..");
798 ftape_current_cylinder = track;
802 static int perpend_mode; /* set if fdc is in perpendicular mode */
804 static int perpend_off(void)
806 __u8 perpend[] = {FDC_PERPEND, 0x00};
810 /* Turn off perpendicular mode */
812 TRACE_CATCH(fdc_command(perpend, 2),
813 TRACE(ft_t_err,"Perpendicular mode exit failed!"));
819 static int handle_perpend(int segment_id)
821 __u8 perpend[] = {FDC_PERPEND, 0x00};
824 /* When writing QIC-3020 tapes, turn on perpendicular mode
825 * if tape is moving in forward direction (even tracks).
827 if (ft_qic_std == QIC_TAPE_QIC3020 &&
828 ((segment_id / ft_segments_per_track) & 1) == 0) {
829 /* FIXME: some i82077 seem to support perpendicular mode as
833 if (fdc.type < i82077AA) {}
835 if (fdc.type < i82077 && ft_data_rate < 1000) {
837 /* fdc does not support perpendicular mode: complain
839 TRACE_ABORT(-EIO, ft_t_err,
840 "Your FDC does not support QIC-3020.");
842 perpend[1] = 0x03 /* 0x83 + (0x4 << ft_drive_sel) */ ;
843 TRACE_CATCH(fdc_command(perpend, 2),
844 TRACE(ft_t_err,"Perpendicular mode entry failed!"));
845 TRACE(ft_t_flow, "Perpendicular mode set");
849 TRACE_EXIT perpend_off();
852 static inline void fdc_setup_dma(char mode,
853 volatile void *addr, unsigned int count)
855 /* Program the DMA controller.
857 disable_dma(fdc.dma);
858 clear_dma_ff(fdc.dma);
859 set_dma_mode(fdc.dma, mode);
860 set_dma_addr(fdc.dma, virt_to_bus((void*)addr));
861 set_dma_count(fdc.dma, count);
865 /* Setup fdc and dma for formatting the next segment
867 int fdc_setup_formatting(buffer_struct * buff)
871 FDC_FORMAT, 0x00, 3, 4 * FT_SECTORS_PER_SEGMENT, 0x00, 0x6b
875 TRACE_CATCH(handle_perpend(buff->segment_id),);
876 /* Program the DMA controller.
879 "phys. addr. = %lx", virt_to_bus((void*) buff->ptr));
880 spin_lock_irqsave(&fdc_io_lock, flags);
881 fdc_setup_dma(DMA_MODE_WRITE, buff->ptr, FT_SECTORS_PER_SEGMENT * 4);
882 /* Issue FDC command to start reading/writing.
884 out[1] = ft_drive_sel;
886 TRACE_CATCH(fdc_setup_error = fdc_command(out, sizeof(out)),
887 restore_flags(flags); fdc_mode = fdc_idle);
888 spin_unlock_irqrestore(&fdc_io_lock, flags);
893 /* Setup Floppy Disk Controller and DMA to read or write the next cluster
894 * of good sectors from or to the current segment.
896 int fdc_setup_read_write(buffer_struct * buff, __u8 operation)
905 if (fdc.type < i82077) {
906 operation = FDC_READ;
909 case FDC_READ_DELETED:
910 dma_mode = DMA_MODE_READ;
911 TRACE(ft_t_fdc_dma, "xfer %d sectors to 0x%p",
912 buff->sector_count, buff->ptr);
913 TRACE_CATCH(perpend_off(),);
915 case FDC_WRITE_DELETED:
916 TRACE(ft_t_noise, "deleting segment %d", buff->segment_id);
918 dma_mode = DMA_MODE_WRITE;
919 /* When writing QIC-3020 tapes, turn on perpendicular mode
920 * if tape is moving in forward direction (even tracks).
922 TRACE_CATCH(handle_perpend(buff->segment_id),);
923 TRACE(ft_t_fdc_dma, "xfer %d sectors from 0x%p",
924 buff->sector_count, buff->ptr);
928 ft_t_bug, "bug: invalid operation parameter");
930 TRACE(ft_t_fdc_dma, "phys. addr. = %lx",virt_to_bus((void*)buff->ptr));
931 spin_lock_irqsave(&fdc_io_lock, flags);
932 if (operation != FDC_VERIFY) {
933 fdc_setup_dma(dma_mode, buff->ptr,
934 FT_SECTOR_SIZE * buff->sector_count);
936 /* Issue FDC command to start reading/writing.
939 out[1] = ft_drive_sel;
942 out[4] = buff->sect + buff->sector_offset;
943 out[5] = 3; /* Sector size of 1K. */
944 out[6] = out[4] + buff->sector_count - 1; /* last sector */
945 out[7] = 109; /* Gap length. */
946 out[8] = 0xff; /* No limit to transfer size. */
947 TRACE(ft_t_fdc_dma, "C: 0x%02x, H: 0x%02x, R: 0x%02x, cnt: 0x%02x",
948 out[2], out[3], out[4], out[6] - out[4] + 1);
949 spin_unlock_irqrestore(&fdc_io_lock, flags);
950 TRACE_CATCH(fdc_setup_error = fdc_command(out, 9),fdc_mode = fdc_idle);
954 int fdc_fifo_threshold(__u8 threshold,
955 int *fifo_state, int *lock_state, int *fifo_thr)
957 const __u8 cmd0[] = {FDC_DUMPREGS};
958 __u8 cmd1[] = {FDC_CONFIGURE, 0, (0x0f & (threshold - 1)), 0};
959 const __u8 cmd2[] = {FDC_LOCK};
960 const __u8 cmd3[] = {FDC_UNLOCK};
967 if (CLK_48MHZ && fdc.type >= i82078) {
968 cmd1[0] |= FDC_CLK48_BIT;
970 /* Dump fdc internal registers for examination
972 TRACE_CATCH(fdc_command(cmd0, NR_ITEMS(cmd0)),
973 TRACE(ft_t_warn, "dumpreg cmd failed, fifo unchanged"));
974 /* Now read fdc internal registers from fifo
976 for (i = 0; i < (int)NR_ITEMS(reg); ++i) {
978 TRACE(ft_t_fdc_dma, "Register %d = 0x%02x", i, reg[i]);
980 if (fifo_state && lock_state && fifo_thr) {
981 *fifo_state = (reg[8] & 0x20) == 0;
982 *lock_state = reg[7] & 0x80;
983 *fifo_thr = 1 + (reg[8] & 0x0f);
986 "original fifo state: %sabled, threshold %d, %slocked",
987 ((reg[8] & 0x20) == 0) ? "en" : "dis",
988 1 + (reg[8] & 0x0f), (reg[7] & 0x80) ? "" : "not ");
989 /* If fdc is already locked, unlock it first ! */
992 TRACE_CATCH(fdc_issue_command(cmd3, NR_ITEMS(cmd3), &stat, 1),
993 TRACE(ft_t_bug, "FDC unlock command failed, "
994 "configuration unchanged"));
997 /* Enable fifo and set threshold at xx bytes to allow a
998 * reasonably large latency and reduce number of dma bursts.
1000 fdc_ready_wait(100);
1001 if ((result = fdc_command(cmd1, NR_ITEMS(cmd1))) < 0) {
1002 TRACE(ft_t_bug, "configure cmd failed, fifo unchanged");
1004 /* Now lock configuration so reset will not change it
1006 if(fdc_issue_command(cmd2, NR_ITEMS(cmd2), &stat, 1) < 0 ||
1008 TRACE_ABORT(-EIO, ft_t_bug,
1009 "FDC lock command failed, stat = 0x%02x", stat);
1011 fdc_fifo_locked = 1;
1015 static int fdc_fifo_enable(void)
1017 TRACE_FUN(ft_t_any);
1019 if (fdc_fifo_locked) {
1020 TRACE_ABORT(0, ft_t_warn, "Fifo not enabled because locked");
1022 TRACE_CATCH(fdc_fifo_threshold(ft_fdc_threshold /* bytes */,
1026 TRACE_CATCH(fdc_fifo_threshold(ft_fdc_threshold /* bytes */,
1027 NULL, NULL, NULL),);
1031 /* Determine fd controller type
1033 static __u8 fdc_save_state[2];
1035 static int fdc_probe(void)
1038 __u8 stat[16]; /* must be able to hold dumpregs & save results */
1040 TRACE_FUN(ft_t_any);
1042 /* Try to find out what kind of fd controller we have to deal with
1043 * Scheme borrowed from floppy driver:
1044 * first try if FDC_DUMPREGS command works
1045 * (this indicates that we have a 82072 or better)
1046 * then try the FDC_VERSION command (82072 doesn't support this)
1047 * then try the FDC_UNLOCK command (some older 82077's don't support this)
1048 * then try the FDC_PARTID command (82078's support this)
1050 cmd[0] = FDC_DUMPREGS;
1051 if (fdc_issue_command(cmd, 1, stat, 1) != 0) {
1052 TRACE_ABORT(no_fdc, ft_t_bug, "No FDC found");
1054 if (stat[0] == 0x80) {
1055 /* invalid command: must be pre 82072 */
1057 ft_t_warn, "Type 8272A/765A compatible FDC found");
1059 fdc_result(&stat[1], 9);
1060 fdc_save_state[0] = stat[7];
1061 fdc_save_state[1] = stat[8];
1062 cmd[0] = FDC_VERSION;
1063 if (fdc_issue_command(cmd, 1, stat, 1) < 0 || stat[0] == 0x80) {
1064 TRACE_ABORT(i8272, ft_t_warn, "Type 82072 FDC found");
1066 if (*stat != 0x90) {
1067 TRACE_ABORT(i8272, ft_t_warn, "Unknown FDC found");
1069 cmd[0] = FDC_UNLOCK;
1070 if(fdc_issue_command(cmd, 1, stat, 1) < 0 || stat[0] != 0x00) {
1071 TRACE_ABORT(i8272, ft_t_warn,
1072 "Type pre-1991 82077 FDC found, "
1073 "treating it like a 82072");
1075 if (fdc_save_state[0] & 0x80) { /* was locked */
1076 cmd[0] = FDC_LOCK; /* restore lock */
1077 (void)fdc_issue_command(cmd, 1, stat, 1);
1078 TRACE(ft_t_warn, "FDC is already locked");
1080 /* Test for a i82078 FDC */
1081 cmd[0] = FDC_PARTID;
1082 if (fdc_issue_command(cmd, 1, stat, 1) < 0 || stat[0] == 0x80) {
1083 /* invalid command: not a i82078xx type FDC */
1084 for (i = 0; i < 4; ++i) {
1086 if ((inb_p(fdc.tdr) & 0x03) != i) {
1088 ft_t_warn, "Type 82077 FDC found");
1091 TRACE_ABORT(i82077AA, ft_t_warn, "Type 82077AA FDC found");
1093 /* FDC_PARTID cmd succeeded */
1094 switch (stat[0] >> 5) {
1096 /* i82078SL or i82078-1. The SL part cannot run at
1097 * 2Mbps (the SL and -1 dies are identical; they are
1098 * speed graded after production, according to Intel).
1099 * Some SL's can be detected by doing a SAVE cmd and
1100 * look at bit 7 of the first byte (the SEL3V# bit).
1101 * If it is 0, the part runs off 3Volts, and hence it
1105 if(fdc_issue_command(cmd, 1, stat, 16) < 0) {
1106 TRACE(ft_t_err, "FDC_SAVE failed. Dunno why");
1107 /* guess we better claim the fdc to be a i82078 */
1110 "Type i82078 FDC (i suppose) found");
1112 if ((stat[0] & FDC_SEL3V_BIT)) {
1113 /* fdc running off 5Volts; Pray that it's a i82078-1
1115 TRACE_ABORT(i82078_1, ft_t_warn,
1116 "Type i82078-1 or 5Volt i82078SL FDC found");
1118 TRACE_ABORT(i82078, ft_t_warn,
1119 "Type 3Volt i82078SL FDC (1Mbps) found");
1121 case 0x2: /* S82078B */
1122 /* The '78B isn't '78 compatible. Detect it as a '77AA */
1123 TRACE_ABORT(i82077AA, ft_t_warn, "Type i82077AA FDC found");
1124 case 0x3: /* NSC PC8744 core; used in several super-IO chips */
1125 TRACE_ABORT(i82077AA,
1126 ft_t_warn, "Type 82077AA compatible FDC found");
1128 TRACE(ft_t_warn, "A previously undetected FDC found");
1129 TRACE_ABORT(i82077AA, ft_t_warn,
1130 "Treating it as a 82077AA. Please report partid= %d",
1132 } /* switch(stat[ 0] >> 5) */
1136 static int fdc_request_regions(void)
1138 TRACE_FUN(ft_t_flow);
1140 if (ft_mach2 || ft_probe_fc10) {
1141 if (!request_region(fdc.sra, 8, "fdc (ft)")) {
1142 #ifndef BROKEN_FLOPPY_DRIVER
1146 "address 0x%03x occupied (by floppy driver?), using it anyway", fdc.sra);
1150 if (!request_region(fdc.sra, 6, "fdc (ft)")) {
1151 #ifndef BROKEN_FLOPPY_DRIVER
1155 "address 0x%03x occupied (by floppy driver?), using it anyway", fdc.sra);
1158 if (!request_region(fdc.sra + 7, 1, "fdc (ft)")) {
1159 #ifndef BROKEN_FLOPPY_DRIVER
1160 release_region(fdc.sra, 6);
1164 "address 0x%03x occupied (by floppy driver?), using it anyway", fdc.sra + 7);
1171 void fdc_release_regions(void)
1173 TRACE_FUN(ft_t_flow);
1176 if (fdc.dor2 != 0) {
1177 release_region(fdc.sra, 8);
1179 release_region(fdc.sra, 6);
1180 release_region(fdc.dir, 1);
1186 static int fdc_config_regs(unsigned int fdc_base,
1187 unsigned int fdc_irq,
1188 unsigned int fdc_dma)
1190 TRACE_FUN(ft_t_flow);
1195 fdc.srb = fdc_base + 1;
1196 fdc.dor = fdc_base + 2;
1197 fdc.tdr = fdc_base + 3;
1198 fdc.msr = fdc.dsr = fdc_base + 4;
1199 fdc.fifo = fdc_base + 5;
1200 fdc.dir = fdc.ccr = fdc_base + 7;
1201 fdc.dor2 = (ft_mach2 || ft_probe_fc10) ? fdc_base + 6 : 0;
1202 TRACE_CATCH(fdc_request_regions(), fdc.sra = 0);
1206 static int fdc_config(void)
1208 static int already_done;
1209 TRACE_FUN(ft_t_any);
1212 TRACE_CATCH(fdc_request_regions(),);
1213 *(fdc.hook) = fdc_isr; /* hook our handler in */
1216 if (ft_probe_fc10) {
1219 TRACE_CATCH(fdc_config_regs(ft_fdc_base,
1220 ft_fdc_irq, ft_fdc_dma),);
1221 fc_type = fc10_enable();
1223 TRACE(ft_t_warn, "FC-%c0 controller found", '0' + fc_type);
1225 fdc.hook = &do_ftape;
1226 *(fdc.hook) = fdc_isr; /* hook our handler in */
1230 TRACE(ft_t_warn, "FC-10/20 controller not found");
1231 fdc_release_regions();
1234 ft_fdc_base = 0x3f0;
1239 TRACE(ft_t_warn, "fdc base: 0x%x, irq: %d, dma: %d",
1240 ft_fdc_base, ft_fdc_irq, ft_fdc_dma);
1241 TRACE_CATCH(fdc_config_regs(ft_fdc_base, ft_fdc_irq, ft_fdc_dma),);
1242 fdc.hook = &do_ftape;
1243 *(fdc.hook) = fdc_isr; /* hook our handler in */
1248 static irqreturn_t ftape_interrupt(int irq, void *dev_id, struct pt_regs *regs)
1250 void (*handler) (void) = *fdc.hook;
1252 TRACE_FUN(ft_t_any);
1259 TRACE(ft_t_bug, "Unexpected ftape interrupt");
1261 TRACE_EXIT IRQ_RETVAL(handled);
1264 static int fdc_grab_irq_and_dma(void)
1266 TRACE_FUN(ft_t_any);
1268 if (fdc.hook == &do_ftape) {
1269 /* Get fast interrupt handler.
1271 if (request_irq(fdc.irq, ftape_interrupt,
1272 SA_INTERRUPT, "ft", ftape_id)) {
1273 TRACE_ABORT(-EIO, ft_t_bug,
1274 "Unable to grab IRQ%d for ftape driver",
1277 if (request_dma(fdc.dma, ftape_id)) {
1278 free_irq(fdc.irq, ftape_id);
1279 TRACE_ABORT(-EIO, ft_t_bug,
1280 "Unable to grab DMA%d for ftape driver",
1284 if (ft_fdc_base != 0x3f0 && (ft_fdc_dma == 2 || ft_fdc_irq == 6)) {
1285 /* Using same dma channel or irq as standard fdc, need
1286 * to disable the dma-gate on the std fdc. This
1287 * couldn't be done in the floppy driver as some
1288 * laptops are using the dma-gate to enter a low power
1289 * or even suspended state :-(
1291 outb_p(FDC_RESET_NOT, 0x3f2);
1292 TRACE(ft_t_noise, "DMA-gate on standard fdc disabled");
1297 int fdc_release_irq_and_dma(void)
1299 TRACE_FUN(ft_t_any);
1301 if (fdc.hook == &do_ftape) {
1302 disable_dma(fdc.dma); /* just in case... */
1304 free_irq(fdc.irq, ftape_id);
1306 if (ft_fdc_base != 0x3f0 && (ft_fdc_dma == 2 || ft_fdc_irq == 6)) {
1307 /* Using same dma channel as standard fdc, need to
1308 * disable the dma-gate on the std fdc. This couldn't
1309 * be done in the floppy driver as some laptops are
1310 * using the dma-gate to enter a low power or even
1311 * suspended state :-(
1313 outb_p(FDC_RESET_NOT | FDC_DMA_MODE, 0x3f2);
1314 TRACE(ft_t_noise, "DMA-gate on standard fdc enabled again");
1321 TRACE_FUN(ft_t_any);
1323 /* find a FDC to use */
1324 TRACE_CATCH(fdc_config(),);
1325 TRACE_CATCH(fdc_grab_irq_and_dma(), fdc_release_regions());
1327 fdc_catch_stray_interrupts(0); /* clear number of awainted
1330 fdc_catch_stray_interrupts(1); /* one always comes (?) */
1331 TRACE(ft_t_flow, "resetting fdc");
1332 fdc_set_seek_rate(2); /* use nominal QIC step rate */
1333 fdc_reset(); /* init fdc & clear track counters */
1334 if (fdc.type == no_fdc) { /* no FC-10 or FC-20 found */
1335 fdc.type = fdc_probe();
1336 fdc_reset(); /* update with new knowledge */
1338 if (fdc.type == no_fdc) {
1339 fdc_release_irq_and_dma();
1340 fdc_release_regions();
1343 if (fdc.type >= i82077) {
1344 if (fdc_fifo_enable() < 0) {
1345 TRACE(ft_t_warn, "couldn't enable fdc fifo !");
1347 TRACE(ft_t_flow, "fdc fifo enabled and locked");