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 && timeout) {
391 set_current_state(TASK_INTERRUPTIBLE);
392 timeout = schedule_timeout(timeout);
395 spin_lock_irq(¤t->sighand->siglock);
396 current->blocked = old_sigmask;
398 spin_unlock_irq(¤t->sighand->siglock);
400 remove_wait_queue(&ftape_wait_intr, &wait);
401 /* the following IS necessary. True: as well
402 * wake_up_interruptible() as the schedule() set TASK_RUNNING
403 * when they wakeup a task, BUT: it may very well be that
404 * ft_interrupt_seen is already set to 1 when we enter here
405 * in which case schedule() gets never called, and
406 * TASK_RUNNING never set. This has the funny effect that we
407 * execute all the code until we leave kernel space, but then
408 * the task is stopped (a task CANNOT be preempted while in
409 * kernel mode. Sending a pair of SIGSTOP/SIGCONT to the
410 * tasks wakes it up again. Funny! :-)
412 current->state = TASK_RUNNING;
413 if (ft_interrupt_seen) { /* woken up by interrupt */
414 ft_interrupt_seen = 0;
418 * In first instance, next statement seems unnecessary since
419 * it will be cleared in fdc_command. However, a small part of
420 * the software seems to rely on this being cleared here
421 * (ftape_close might fail) so stick to it until things get fixed !
423 /* My deeply sought of knowledge:
424 * Behold NO! It is obvious. fdc_reset() doesn't call fdc_command()
425 * but nevertheless uses fdc_interrupt_wait(). OF COURSE this needs to
428 ft_interrupt_seen = 0; /* clear for next call */
430 resetting = 1; /* break infinite recursion if reset fails */
431 TRACE(ft_t_any, "cleanup reset");
435 TRACE_EXIT (signal_pending(current)) ? -EINTR : -ETIME;
438 /* Start/stop drive motor. Enable DMA mode.
440 void fdc_motor(int motor)
442 int unit = ft_drive_sel;
443 int data = unit | FDC_RESET_NOT | FDC_DMA_MODE;
448 data |= FDC_MOTOR_0 << unit;
449 TRACE(ft_t_noise, "turning motor %d on", unit);
451 TRACE(ft_t_noise, "turning motor %d off", unit);
454 outb_p(data, fdc.dor2);
456 outb_p(data, fdc.dor);
458 ftape_sleep(10 * FT_MILLISECOND);
462 static void fdc_update_dsr(void)
466 TRACE(ft_t_flow, "rate = %d Kbps, precomp = %d ns",
467 fdc_data_rate, fdc_precomp);
468 if (fdc.type >= i82077) {
469 outb_p((fdc_rate_code & 0x03) | fdc_prec_code, fdc.dsr);
471 outb_p(fdc_rate_code & 0x03, fdc.ccr);
476 void fdc_set_write_precomp(int precomp)
480 TRACE(ft_t_noise, "New precomp: %d nsec", precomp);
481 fdc_precomp = precomp;
482 /* write precompensation can be set in multiples of 41.67 nsec.
483 * round the parameter to the nearest multiple and convert it
484 * into a fdc setting. Note that 0 means default to the fdc,
485 * 7 is used instead of that.
487 fdc_prec_code = ((fdc_precomp + 21) / 42) << 2;
488 if (fdc_prec_code == 0 || fdc_prec_code > (6 << 2)) {
489 fdc_prec_code = 7 << 2;
495 /* Reprogram the 82078 registers to use Data Rate Table 1 on all drives.
497 static void fdc_set_drive_specs(void)
499 __u8 cmd[] = { FDC_DRIVE_SPEC, 0x00, 0x00, 0x00, 0x00, 0xc0};
503 TRACE(ft_t_flow, "Setting of drive specs called");
504 if (fdc.type >= i82078_1) {
505 cmd[1] = (0 << 5) | (2 << 2);
506 cmd[2] = (1 << 5) | (2 << 2);
507 cmd[3] = (2 << 5) | (2 << 2);
508 cmd[4] = (3 << 5) | (2 << 2);
509 result = fdc_command(cmd, NR_ITEMS(cmd));
511 TRACE(ft_t_err, "Setting of drive specs failed");
517 /* Select clock for fdc, must correspond with tape drive setting !
518 * This also influences the fdc timing so we must adjust some values.
520 int fdc_set_data_rate(int rate)
525 /* Select clock for fdc, must correspond with tape drive setting !
526 * This also influences the fdc timing so we must adjust some values.
528 TRACE(ft_t_fdc_dma, "new rate = %d", rate);
531 fdc_rate_code = fdc_data_rate_250;
534 fdc_rate_code = fdc_data_rate_500;
537 if (fdc.type < i82077) {
540 fdc_rate_code = fdc_data_rate_1000;
544 if (fdc.type < i82078_1) {
547 fdc_rate_code = fdc_data_rate_2000;
555 ft_t_fdc_dma, "%d is not a valid data rate", rate);
557 fdc_data_rate = rate;
559 fdc_set_seek_rate(fdc_seek_rate); /* clock changed! */
564 /* keep the unit select if keep_select is != 0,
566 static void fdc_dor_reset(int keep_select)
568 __u8 fdc_ctl = ft_drive_sel;
570 if (keep_select != 0) {
571 fdc_ctl |= FDC_DMA_MODE;
573 fdc_ctl |= FDC_MOTOR_0 << ft_drive_sel;
576 ftape_udelay(10); /* ??? but seems to be necessary */
578 outb_p(fdc_ctl & 0x0f, fdc.dor);
579 outb_p(fdc_ctl, fdc.dor2);
581 outb_p(fdc_ctl, fdc.dor);
583 fdc_usec_wait(10); /* delay >= 14 fdc clocks */
584 if (keep_select == 0) {
587 fdc_ctl |= FDC_RESET_NOT;
589 outb_p(fdc_ctl & 0x0f, fdc.dor);
590 outb_p(fdc_ctl, fdc.dor2);
592 outb_p(fdc_ctl, fdc.dor);
596 /* Reset the floppy disk controller. Leave the ftape_unit selected.
606 spin_lock_irqsave(&fdc_io_lock, flags);
608 fdc_dor_reset(1); /* keep unit selected */
612 /* maybe the cli()/sti() pair is not necessary, BUT:
613 * the following line MUST be here. Otherwise fdc_interrupt_wait()
614 * won't wait. Note that fdc_reset() is called from
615 * ftape_dumb_stop() when the fdc is busy transferring data. In this
616 * case fdc_isr() MOST PROBABLY sets ft_interrupt_seen, and tries
617 * to get the result bytes from the fdc etc. CLASH.
619 ft_interrupt_seen = 0;
623 fdc_update_dsr(); /* restore data rate and precomp */
625 spin_unlock_irqrestore(&fdc_io_lock, flags);
628 * Wait for first polling cycle to complete
630 if (fdc_interrupt_wait(1 * FT_SECOND) < 0) {
631 TRACE(ft_t_err, "no drive polling interrupt!");
632 } else { /* clear all disk-changed statuses */
633 for (i = 0; i < 4; ++i) {
634 if(fdc_sense_interrupt_status(&st0, &dummy) != 0) {
635 TRACE(ft_t_err, "sense failed for %d", i);
637 if (i == ft_drive_sel) {
638 ftape_current_cylinder = dummy;
641 TRACE(ft_t_noise, "drive polling completed");
646 fdc_set_seek_rate(fdc_seek_rate);
648 * DRIVE SPECIFICATION COMMAND (if fdc type known)
650 if (fdc.type >= i82078_1) {
651 fdc_set_drive_specs();
656 #if !defined(CLK_48MHZ)
660 /* When we're done, put the fdc into reset mode so that the regular
661 * floppy disk driver will figure out that something is wrong and
662 * initialize the controller the way it wants.
664 void fdc_disable(void)
666 __u8 cmd1[] = {FDC_CONFIGURE, 0x00, 0x00, 0x00};
667 __u8 cmd2[] = {FDC_LOCK};
668 __u8 cmd3[] = {FDC_UNLOCK};
670 TRACE_FUN(ft_t_flow);
672 if (!fdc_fifo_locked) {
676 if (fdc_issue_command(cmd3, 1, stat, 1) < 0 || stat[0] != 0x00) {
678 TRACE_ABORT(/**/, ft_t_bug,
679 "couldn't unlock fifo, configuration remains changed");
682 if (CLK_48MHZ && fdc.type >= i82078) {
683 cmd1[0] |= FDC_CLK48_BIT;
685 cmd1[2] = ((fdc_fifo_state) ? 0 : 0x20) + (fdc_fifo_thr - 1);
686 if (fdc_command(cmd1, NR_ITEMS(cmd1)) < 0) {
688 TRACE_ABORT(/**/, ft_t_bug,
689 "couldn't reconfigure fifo to old state");
691 if (fdc_lock_state &&
692 fdc_issue_command(cmd2, 1, stat, 1) < 0) {
694 TRACE_ABORT(/**/, ft_t_bug, "couldn't lock old state again");
696 TRACE(ft_t_noise, "fifo restored: %sabled, thr. %d, %slocked",
697 fdc_fifo_state ? "en" : "dis",
698 fdc_fifo_thr, (fdc_lock_state) ? "" : "not ");
703 /* Specify FDC seek-rate (milliseconds)
705 static int fdc_set_seek_rate(int seek_rate)
707 /* set step rate, dma mode, and minimal head load and unload times
709 __u8 in[3] = { FDC_SPECIFY, 1, (1 << 1)};
711 fdc_seek_rate = seek_rate;
712 in[1] |= (16 - (fdc_data_rate * fdc_seek_rate) / 500) << 4;
714 return fdc_command(in, 3);
717 /* Sense drive status: get unit's drive status (ST3)
719 int fdc_sense_drive_status(int *st3)
726 out[1] = ft_drive_sel;
727 TRACE_CATCH(fdc_issue_command(out, 2, in, 1),);
732 /* Sense Interrupt Status command:
733 * should be issued at the end of each seek.
734 * get ST0 and current cylinder.
736 int fdc_sense_interrupt_status(int *st0, int *current_cylinder)
743 TRACE_CATCH(fdc_issue_command(out, 1, in, 2),);
745 *current_cylinder = in[1];
751 int fdc_seek(int track)
761 out[1] = ft_drive_sel;
764 time = ftape_timestamp();
766 /* We really need this command to work !
768 ft_seek_completed = 0;
769 TRACE_CATCH(fdc_command(out, 3),
771 TRACE(ft_t_noise, "destination was: %d, resetting FDC...",
773 /* Handle interrupts until ft_seek_completed or timeout.
776 TRACE_CATCH(fdc_interrupt_wait(2 * FT_SECOND),);
777 if (ft_seek_completed) {
778 TRACE_CATCH(fdc_sense_interrupt_status(&st0, &pcn),);
779 if ((st0 & ST0_SEEK_END) == 0) {
780 TRACE_ABORT(-EIO, ft_t_err,
781 "no seek-end after seek completion !??");
787 time = ftape_timediff(time, ftape_timestamp()) / abs(track - ftape_current_cylinder);
788 if ((time < 900 || time > 3100) && abs(track - ftape_current_cylinder) > 5) {
789 TRACE(ft_t_warn, "Wrong FDC STEP interval: %d usecs (%d)",
790 time, track - ftape_current_cylinder);
793 /* Verify whether we issued the right tape command.
795 /* Verify that we seek to the proper track. */
797 TRACE_ABORT(-EIO, ft_t_err, "bad seek..");
799 ftape_current_cylinder = track;
803 static int perpend_mode; /* set if fdc is in perpendicular mode */
805 static int perpend_off(void)
807 __u8 perpend[] = {FDC_PERPEND, 0x00};
811 /* Turn off perpendicular mode */
813 TRACE_CATCH(fdc_command(perpend, 2),
814 TRACE(ft_t_err,"Perpendicular mode exit failed!"));
820 static int handle_perpend(int segment_id)
822 __u8 perpend[] = {FDC_PERPEND, 0x00};
825 /* When writing QIC-3020 tapes, turn on perpendicular mode
826 * if tape is moving in forward direction (even tracks).
828 if (ft_qic_std == QIC_TAPE_QIC3020 &&
829 ((segment_id / ft_segments_per_track) & 1) == 0) {
830 /* FIXME: some i82077 seem to support perpendicular mode as
834 if (fdc.type < i82077AA) {}
836 if (fdc.type < i82077 && ft_data_rate < 1000) {
838 /* fdc does not support perpendicular mode: complain
840 TRACE_ABORT(-EIO, ft_t_err,
841 "Your FDC does not support QIC-3020.");
843 perpend[1] = 0x03 /* 0x83 + (0x4 << ft_drive_sel) */ ;
844 TRACE_CATCH(fdc_command(perpend, 2),
845 TRACE(ft_t_err,"Perpendicular mode entry failed!"));
846 TRACE(ft_t_flow, "Perpendicular mode set");
850 TRACE_EXIT perpend_off();
853 static inline void fdc_setup_dma(char mode,
854 volatile void *addr, unsigned int count)
856 /* Program the DMA controller.
858 disable_dma(fdc.dma);
859 clear_dma_ff(fdc.dma);
860 set_dma_mode(fdc.dma, mode);
861 set_dma_addr(fdc.dma, virt_to_bus((void*)addr));
862 set_dma_count(fdc.dma, count);
866 /* Setup fdc and dma for formatting the next segment
868 int fdc_setup_formatting(buffer_struct * buff)
872 FDC_FORMAT, 0x00, 3, 4 * FT_SECTORS_PER_SEGMENT, 0x00, 0x6b
876 TRACE_CATCH(handle_perpend(buff->segment_id),);
877 /* Program the DMA controller.
880 "phys. addr. = %lx", virt_to_bus((void*) buff->ptr));
881 spin_lock_irqsave(&fdc_io_lock, flags);
882 fdc_setup_dma(DMA_MODE_WRITE, buff->ptr, FT_SECTORS_PER_SEGMENT * 4);
883 /* Issue FDC command to start reading/writing.
885 out[1] = ft_drive_sel;
887 TRACE_CATCH(fdc_setup_error = fdc_command(out, sizeof(out)),
888 restore_flags(flags); fdc_mode = fdc_idle);
889 spin_unlock_irqrestore(&fdc_io_lock, flags);
894 /* Setup Floppy Disk Controller and DMA to read or write the next cluster
895 * of good sectors from or to the current segment.
897 int fdc_setup_read_write(buffer_struct * buff, __u8 operation)
906 if (fdc.type < i82077) {
907 operation = FDC_READ;
910 case FDC_READ_DELETED:
911 dma_mode = DMA_MODE_READ;
912 TRACE(ft_t_fdc_dma, "xfer %d sectors to 0x%p",
913 buff->sector_count, buff->ptr);
914 TRACE_CATCH(perpend_off(),);
916 case FDC_WRITE_DELETED:
917 TRACE(ft_t_noise, "deleting segment %d", buff->segment_id);
919 dma_mode = DMA_MODE_WRITE;
920 /* When writing QIC-3020 tapes, turn on perpendicular mode
921 * if tape is moving in forward direction (even tracks).
923 TRACE_CATCH(handle_perpend(buff->segment_id),);
924 TRACE(ft_t_fdc_dma, "xfer %d sectors from 0x%p",
925 buff->sector_count, buff->ptr);
929 ft_t_bug, "bug: invalid operation parameter");
931 TRACE(ft_t_fdc_dma, "phys. addr. = %lx",virt_to_bus((void*)buff->ptr));
932 spin_lock_irqsave(&fdc_io_lock, flags);
933 if (operation != FDC_VERIFY) {
934 fdc_setup_dma(dma_mode, buff->ptr,
935 FT_SECTOR_SIZE * buff->sector_count);
937 /* Issue FDC command to start reading/writing.
940 out[1] = ft_drive_sel;
943 out[4] = buff->sect + buff->sector_offset;
944 out[5] = 3; /* Sector size of 1K. */
945 out[6] = out[4] + buff->sector_count - 1; /* last sector */
946 out[7] = 109; /* Gap length. */
947 out[8] = 0xff; /* No limit to transfer size. */
948 TRACE(ft_t_fdc_dma, "C: 0x%02x, H: 0x%02x, R: 0x%02x, cnt: 0x%02x",
949 out[2], out[3], out[4], out[6] - out[4] + 1);
950 spin_unlock_irqrestore(&fdc_io_lock, flags);
951 TRACE_CATCH(fdc_setup_error = fdc_command(out, 9),fdc_mode = fdc_idle);
955 int fdc_fifo_threshold(__u8 threshold,
956 int *fifo_state, int *lock_state, int *fifo_thr)
958 const __u8 cmd0[] = {FDC_DUMPREGS};
959 __u8 cmd1[] = {FDC_CONFIGURE, 0, (0x0f & (threshold - 1)), 0};
960 const __u8 cmd2[] = {FDC_LOCK};
961 const __u8 cmd3[] = {FDC_UNLOCK};
968 if (CLK_48MHZ && fdc.type >= i82078) {
969 cmd1[0] |= FDC_CLK48_BIT;
971 /* Dump fdc internal registers for examination
973 TRACE_CATCH(fdc_command(cmd0, NR_ITEMS(cmd0)),
974 TRACE(ft_t_warn, "dumpreg cmd failed, fifo unchanged"));
975 /* Now read fdc internal registers from fifo
977 for (i = 0; i < (int)NR_ITEMS(reg); ++i) {
979 TRACE(ft_t_fdc_dma, "Register %d = 0x%02x", i, reg[i]);
981 if (fifo_state && lock_state && fifo_thr) {
982 *fifo_state = (reg[8] & 0x20) == 0;
983 *lock_state = reg[7] & 0x80;
984 *fifo_thr = 1 + (reg[8] & 0x0f);
987 "original fifo state: %sabled, threshold %d, %slocked",
988 ((reg[8] & 0x20) == 0) ? "en" : "dis",
989 1 + (reg[8] & 0x0f), (reg[7] & 0x80) ? "" : "not ");
990 /* If fdc is already locked, unlock it first ! */
993 TRACE_CATCH(fdc_issue_command(cmd3, NR_ITEMS(cmd3), &stat, 1),
994 TRACE(ft_t_bug, "FDC unlock command failed, "
995 "configuration unchanged"));
998 /* Enable fifo and set threshold at xx bytes to allow a
999 * reasonably large latency and reduce number of dma bursts.
1001 fdc_ready_wait(100);
1002 if ((result = fdc_command(cmd1, NR_ITEMS(cmd1))) < 0) {
1003 TRACE(ft_t_bug, "configure cmd failed, fifo unchanged");
1005 /* Now lock configuration so reset will not change it
1007 if(fdc_issue_command(cmd2, NR_ITEMS(cmd2), &stat, 1) < 0 ||
1009 TRACE_ABORT(-EIO, ft_t_bug,
1010 "FDC lock command failed, stat = 0x%02x", stat);
1012 fdc_fifo_locked = 1;
1016 static int fdc_fifo_enable(void)
1018 TRACE_FUN(ft_t_any);
1020 if (fdc_fifo_locked) {
1021 TRACE_ABORT(0, ft_t_warn, "Fifo not enabled because locked");
1023 TRACE_CATCH(fdc_fifo_threshold(ft_fdc_threshold /* bytes */,
1027 TRACE_CATCH(fdc_fifo_threshold(ft_fdc_threshold /* bytes */,
1028 NULL, NULL, NULL),);
1032 /* Determine fd controller type
1034 static __u8 fdc_save_state[2];
1036 static int fdc_probe(void)
1039 __u8 stat[16]; /* must be able to hold dumpregs & save results */
1041 TRACE_FUN(ft_t_any);
1043 /* Try to find out what kind of fd controller we have to deal with
1044 * Scheme borrowed from floppy driver:
1045 * first try if FDC_DUMPREGS command works
1046 * (this indicates that we have a 82072 or better)
1047 * then try the FDC_VERSION command (82072 doesn't support this)
1048 * then try the FDC_UNLOCK command (some older 82077's don't support this)
1049 * then try the FDC_PARTID command (82078's support this)
1051 cmd[0] = FDC_DUMPREGS;
1052 if (fdc_issue_command(cmd, 1, stat, 1) != 0) {
1053 TRACE_ABORT(no_fdc, ft_t_bug, "No FDC found");
1055 if (stat[0] == 0x80) {
1056 /* invalid command: must be pre 82072 */
1058 ft_t_warn, "Type 8272A/765A compatible FDC found");
1060 fdc_result(&stat[1], 9);
1061 fdc_save_state[0] = stat[7];
1062 fdc_save_state[1] = stat[8];
1063 cmd[0] = FDC_VERSION;
1064 if (fdc_issue_command(cmd, 1, stat, 1) < 0 || stat[0] == 0x80) {
1065 TRACE_ABORT(i8272, ft_t_warn, "Type 82072 FDC found");
1067 if (*stat != 0x90) {
1068 TRACE_ABORT(i8272, ft_t_warn, "Unknown FDC found");
1070 cmd[0] = FDC_UNLOCK;
1071 if(fdc_issue_command(cmd, 1, stat, 1) < 0 || stat[0] != 0x00) {
1072 TRACE_ABORT(i8272, ft_t_warn,
1073 "Type pre-1991 82077 FDC found, "
1074 "treating it like a 82072");
1076 if (fdc_save_state[0] & 0x80) { /* was locked */
1077 cmd[0] = FDC_LOCK; /* restore lock */
1078 (void)fdc_issue_command(cmd, 1, stat, 1);
1079 TRACE(ft_t_warn, "FDC is already locked");
1081 /* Test for a i82078 FDC */
1082 cmd[0] = FDC_PARTID;
1083 if (fdc_issue_command(cmd, 1, stat, 1) < 0 || stat[0] == 0x80) {
1084 /* invalid command: not a i82078xx type FDC */
1085 for (i = 0; i < 4; ++i) {
1087 if ((inb_p(fdc.tdr) & 0x03) != i) {
1089 ft_t_warn, "Type 82077 FDC found");
1092 TRACE_ABORT(i82077AA, ft_t_warn, "Type 82077AA FDC found");
1094 /* FDC_PARTID cmd succeeded */
1095 switch (stat[0] >> 5) {
1097 /* i82078SL or i82078-1. The SL part cannot run at
1098 * 2Mbps (the SL and -1 dies are identical; they are
1099 * speed graded after production, according to Intel).
1100 * Some SL's can be detected by doing a SAVE cmd and
1101 * look at bit 7 of the first byte (the SEL3V# bit).
1102 * If it is 0, the part runs off 3Volts, and hence it
1106 if(fdc_issue_command(cmd, 1, stat, 16) < 0) {
1107 TRACE(ft_t_err, "FDC_SAVE failed. Dunno why");
1108 /* guess we better claim the fdc to be a i82078 */
1111 "Type i82078 FDC (i suppose) found");
1113 if ((stat[0] & FDC_SEL3V_BIT)) {
1114 /* fdc running off 5Volts; Pray that it's a i82078-1
1116 TRACE_ABORT(i82078_1, ft_t_warn,
1117 "Type i82078-1 or 5Volt i82078SL FDC found");
1119 TRACE_ABORT(i82078, ft_t_warn,
1120 "Type 3Volt i82078SL FDC (1Mbps) found");
1122 case 0x2: /* S82078B */
1123 /* The '78B isn't '78 compatible. Detect it as a '77AA */
1124 TRACE_ABORT(i82077AA, ft_t_warn, "Type i82077AA FDC found");
1125 case 0x3: /* NSC PC8744 core; used in several super-IO chips */
1126 TRACE_ABORT(i82077AA,
1127 ft_t_warn, "Type 82077AA compatible FDC found");
1129 TRACE(ft_t_warn, "A previously undetected FDC found");
1130 TRACE_ABORT(i82077AA, ft_t_warn,
1131 "Treating it as a 82077AA. Please report partid= %d",
1133 } /* switch(stat[ 0] >> 5) */
1137 static int fdc_request_regions(void)
1139 TRACE_FUN(ft_t_flow);
1141 if (ft_mach2 || ft_probe_fc10) {
1142 if (!request_region(fdc.sra, 8, "fdc (ft)")) {
1143 #ifndef BROKEN_FLOPPY_DRIVER
1147 "address 0x%03x occupied (by floppy driver?), using it anyway", fdc.sra);
1151 if (!request_region(fdc.sra, 6, "fdc (ft)")) {
1152 #ifndef BROKEN_FLOPPY_DRIVER
1156 "address 0x%03x occupied (by floppy driver?), using it anyway", fdc.sra);
1159 if (!request_region(fdc.sra + 7, 1, "fdc (ft)")) {
1160 #ifndef BROKEN_FLOPPY_DRIVER
1161 release_region(fdc.sra, 6);
1165 "address 0x%03x occupied (by floppy driver?), using it anyway", fdc.sra + 7);
1172 void fdc_release_regions(void)
1174 TRACE_FUN(ft_t_flow);
1177 if (fdc.dor2 != 0) {
1178 release_region(fdc.sra, 8);
1180 release_region(fdc.sra, 6);
1181 release_region(fdc.dir, 1);
1187 static int fdc_config_regs(unsigned int fdc_base,
1188 unsigned int fdc_irq,
1189 unsigned int fdc_dma)
1191 TRACE_FUN(ft_t_flow);
1196 fdc.srb = fdc_base + 1;
1197 fdc.dor = fdc_base + 2;
1198 fdc.tdr = fdc_base + 3;
1199 fdc.msr = fdc.dsr = fdc_base + 4;
1200 fdc.fifo = fdc_base + 5;
1201 fdc.dir = fdc.ccr = fdc_base + 7;
1202 fdc.dor2 = (ft_mach2 || ft_probe_fc10) ? fdc_base + 6 : 0;
1203 TRACE_CATCH(fdc_request_regions(), fdc.sra = 0);
1207 static int fdc_config(void)
1209 static int already_done;
1210 TRACE_FUN(ft_t_any);
1213 TRACE_CATCH(fdc_request_regions(),);
1214 *(fdc.hook) = fdc_isr; /* hook our handler in */
1217 if (ft_probe_fc10) {
1220 TRACE_CATCH(fdc_config_regs(ft_fdc_base,
1221 ft_fdc_irq, ft_fdc_dma),);
1222 fc_type = fc10_enable();
1224 TRACE(ft_t_warn, "FC-%c0 controller found", '0' + fc_type);
1226 fdc.hook = &do_ftape;
1227 *(fdc.hook) = fdc_isr; /* hook our handler in */
1231 TRACE(ft_t_warn, "FC-10/20 controller not found");
1232 fdc_release_regions();
1235 ft_fdc_base = 0x3f0;
1240 TRACE(ft_t_warn, "fdc base: 0x%x, irq: %d, dma: %d",
1241 ft_fdc_base, ft_fdc_irq, ft_fdc_dma);
1242 TRACE_CATCH(fdc_config_regs(ft_fdc_base, ft_fdc_irq, ft_fdc_dma),);
1243 fdc.hook = &do_ftape;
1244 *(fdc.hook) = fdc_isr; /* hook our handler in */
1249 static irqreturn_t ftape_interrupt(int irq, void *dev_id, struct pt_regs *regs)
1251 void (*handler) (void) = *fdc.hook;
1253 TRACE_FUN(ft_t_any);
1260 TRACE(ft_t_bug, "Unexpected ftape interrupt");
1262 TRACE_EXIT IRQ_RETVAL(handled);
1265 static int fdc_grab_irq_and_dma(void)
1267 TRACE_FUN(ft_t_any);
1269 if (fdc.hook == &do_ftape) {
1270 /* Get fast interrupt handler.
1272 if (request_irq(fdc.irq, ftape_interrupt,
1273 SA_INTERRUPT, "ft", ftape_id)) {
1274 TRACE_ABORT(-EIO, ft_t_bug,
1275 "Unable to grab IRQ%d for ftape driver",
1278 if (request_dma(fdc.dma, ftape_id)) {
1279 free_irq(fdc.irq, ftape_id);
1280 TRACE_ABORT(-EIO, ft_t_bug,
1281 "Unable to grab DMA%d for ftape driver",
1285 if (ft_fdc_base != 0x3f0 && (ft_fdc_dma == 2 || ft_fdc_irq == 6)) {
1286 /* Using same dma channel or irq as standard fdc, need
1287 * to disable the dma-gate on the std fdc. This
1288 * couldn't be done in the floppy driver as some
1289 * laptops are using the dma-gate to enter a low power
1290 * or even suspended state :-(
1292 outb_p(FDC_RESET_NOT, 0x3f2);
1293 TRACE(ft_t_noise, "DMA-gate on standard fdc disabled");
1298 int fdc_release_irq_and_dma(void)
1300 TRACE_FUN(ft_t_any);
1302 if (fdc.hook == &do_ftape) {
1303 disable_dma(fdc.dma); /* just in case... */
1305 free_irq(fdc.irq, ftape_id);
1307 if (ft_fdc_base != 0x3f0 && (ft_fdc_dma == 2 || ft_fdc_irq == 6)) {
1308 /* Using same dma channel as standard fdc, need to
1309 * disable the dma-gate on the std fdc. This couldn't
1310 * be done in the floppy driver as some laptops are
1311 * using the dma-gate to enter a low power or even
1312 * suspended state :-(
1314 outb_p(FDC_RESET_NOT | FDC_DMA_MODE, 0x3f2);
1315 TRACE(ft_t_noise, "DMA-gate on standard fdc enabled again");
1322 TRACE_FUN(ft_t_any);
1324 /* find a FDC to use */
1325 TRACE_CATCH(fdc_config(),);
1326 TRACE_CATCH(fdc_grab_irq_and_dma(), fdc_release_regions());
1328 fdc_catch_stray_interrupts(0); /* clear number of awainted
1331 fdc_catch_stray_interrupts(1); /* one always comes (?) */
1332 TRACE(ft_t_flow, "resetting fdc");
1333 fdc_set_seek_rate(2); /* use nominal QIC step rate */
1334 fdc_reset(); /* init fdc & clear track counters */
1335 if (fdc.type == no_fdc) { /* no FC-10 or FC-20 found */
1336 fdc.type = fdc_probe();
1337 fdc_reset(); /* update with new knowledge */
1339 if (fdc.type == no_fdc) {
1340 fdc_release_irq_and_dma();
1341 fdc_release_regions();
1344 if (fdc.type >= i82077) {
1345 if (fdc_fifo_enable() < 0) {
1346 TRACE(ft_t_warn, "couldn't enable fdc fifo !");
1348 TRACE(ft_t_flow, "fdc fifo enabled and locked");