2 * linux/arch/arm/drivers/block/mfmhd.c
4 * Copyright (C) 1995, 1996 Russell King, Dave Alan Gilbert (gilbertd@cs.man.ac.uk)
6 * MFM hard drive code [experimental]
12 * 3/2/96:DAG: Started a change list :-)
13 * Set the hardsect_size pointers up since we are running 256 byte
15 * Added DMA code, put it into the rw_intr
16 * Moved RCAL out of generic interrupt code - don't want to do it
17 * while DMA'ing - its now in individual handlers.
18 * Took interrupt handlers off task queue lists and called
19 * directly - not sure of implications.
21 * 18/2/96:DAG: Well its reading OK I think, well enough for image file code
22 * to find the image file; but now I've discovered that I actually
23 * have to put some code in for image files.
25 * Added stuff for image files; seems to work, but I've not
26 * got a multisegment image file (I don't think!).
27 * Put in a hack (yep a real hack) for multiple cylinder reads.
28 * Not convinced its working.
30 * 5/4/96:DAG: Added asm/hardware.h and use IOC_ macros
31 * Rewrote dma code in mfm.S (again!) - now takes a word at a time
32 * from main RAM for speed; still doesn't feel speedy!
34 * 20/4/96:DAG: After rewriting mfm.S a heck of a lot of times and speeding
35 * things up, I've finally figured out why its so damn slow.
36 * Linux is only reading a block at a time, and so you never
37 * get more than 1K per disc revoloution ~=60K/second.
39 * 27/4/96:DAG: On Russell's advice I change ll_rw_blk.c to ask it to
40 * join adjacent blocks together. Everything falls flat on its
42 * Four hours of debugging later; I hadn't realised that
43 * ll_rw_blk would be so generous as to join blocks whose
44 * results aren't going into consecutive buffers.
46 * OK; severe rehacking of mfm_rw_interrupt; now end_request's
47 * as soon as its DMA'd each request. Odd thing is that
48 * we are sometimes getting interrupts where we are not transferring
49 * any data; why? Is that what happens when you miss? I doubt
50 * it; are we too fast? No - its just at command ends. Got 240K/s
51 * better than before, but RiscOS hits 480K/s
53 * 25/6/96:RMK: Fixed init code to allow the MFM podule to work. Increased the
54 * number of errors for my Miniscribe drive (8425).
56 * 30/6/96:DAG: Russell suggested that a check drive 0 might turn the LEDs off
57 * - so in request_done just before it clears Busy it sends a
58 * check drive 0 - and the LEDs go off!!!!
60 * Added test for mainboard controller. - Removes need for separate
63 * 13/7/96:DAG: Changed hardware sectore size to 512 in attempt to make
65 * 21/7/96:DAG: Took out old image file stuff (accessing it now produces an IO
68 * 17/8/96:DAG: Ran through indent -kr -i8; evil - all my nice 2 character indents
69 * gone :-( Hand modified afterwards.
70 * Took out last remains of the older image map system.
72 * 22/9/96:DAG: Changed mfm.S so it will carry on DMA'ing til; BSY is dropped
73 * Changed mfm_rw_intr so that it doesn't follow the error
74 * code until BSY is dropped. Nope - still broke. Problem
75 * may revolve around when it reads the results for the error
78 *16/11/96:DAG: Modified for 2.0.18; request_irq changed
80 *17/12/96:RMK: Various cleanups, reorganisation, and the changes for new IO system.
81 * Improved probe for onboard MFM chip - it was hanging on my A5k.
82 * Added autodetect CHS code such that we don't rely on the presence
83 * of an ADFS boot block. Added ioport resource manager calls so
84 * that we don't clash with already-running hardware (eg. RiscPC Ether
85 * card slots if someone tries this)!
87 * 17/1/97:RMK: Upgraded to 2.1 kernels.
89 * 4/3/98:RMK: Changed major number to 21.
91 * 27/6/98:RMK: Changed asm/delay.h to linux/delay.h for mdelay().
95 * Possible enhancements:
96 * Multi-thread the code so that it is possible that while one drive
97 * is seeking, the other one can be reading data/seeking as well.
98 * This would be a performance boost with dual drive systems.
101 #include <linux/module.h>
102 #include <linux/config.h>
103 #include <linux/sched.h>
104 #include <linux/fs.h>
105 #include <linux/interrupt.h>
106 #include <linux/kernel.h>
107 #include <linux/timer.h>
108 #include <linux/tqueue.h>
109 #include <linux/mm.h>
110 #include <linux/errno.h>
111 #include <linux/genhd.h>
112 #include <linux/major.h>
113 #include <linux/ioport.h>
114 #include <linux/delay.h>
116 #define MAJOR_NR MFM_ACORN_MAJOR
117 #include <linux/blk.h>
118 #include <linux/blkpg.h>
120 #include <asm/system.h>
123 #include <asm/uaccess.h>
125 #include <asm/hardware.h>
126 #include <asm/ecard.h>
127 #include <asm/hardware/ioc.h>
130 * This sort of stuff should be in a header file shared with ide.c, hd.c, xd.c etc
133 #define HDIO_GETGEO 0x301
136 unsigned char sectors;
137 unsigned short cylinders;
144 * Configuration section
146 * This is the maximum number of drives that we accept
148 #define MFM_MAXDRIVES 2
150 * Linux I/O address of onboard MFM controller or 0 to disable this
152 #define ONBOARD_MFM_ADDRESS ((0x002d0000 >> 2) | 0x80000000)
154 * Uncomment this to enable debugging in the MFM driver...
160 * List of card types that we recognise
162 static const card_ids mfm_cids[] = {
163 { MANU_ACORN, PROD_ACORN_MFM },
167 * End of configuration
172 * This structure contains all information to do with a particular physical
176 unsigned char sectors;
178 unsigned short cylinders;
179 unsigned short lowcurrent;
180 unsigned short precomp;
182 #define NEED_1_RECAL -2
183 #define NEED_2_RECAL -3
185 unsigned int access_count;
192 } mfm_info[MFM_MAXDRIVES];
194 #define MFM_DRV_INFO mfm_info[raw_cmd.dev]
196 static struct hd_struct mfm[MFM_MAXDRIVES << 6];
197 static int mfm_sizes[MFM_MAXDRIVES << 6];
198 static int mfm_blocksizes[MFM_MAXDRIVES << 6];
199 static int mfm_sectsizes[MFM_MAXDRIVES << 6];
200 static DECLARE_WAIT_QUEUE_HEAD(mfm_wait_open);
202 /* Stuff from the assembly routines */
203 extern unsigned int hdc63463_baseaddress; /* Controller base address */
204 extern unsigned int hdc63463_irqpolladdress; /* Address to read to test for int */
205 extern unsigned int hdc63463_irqpollmask; /* Mask for irq register */
206 extern unsigned int hdc63463_dataptr; /* Pointer to kernel data space to DMA */
207 extern int hdc63463_dataleft; /* Number of bytes left to transfer */
212 static int lastspecifieddrive;
213 static unsigned Busy;
215 static unsigned int PartFragRead; /* The number of sectors which have been read
216 during a partial read split over two
217 cylinders. If 0 it means a partial
218 read did not occur. */
220 static unsigned int PartFragRead_RestartBlock; /* Where to restart on a split access */
221 static unsigned int PartFragRead_SectorsLeft; /* Where to restart on a split access */
223 static int Sectors256LeftInCurrent; /* i.e. 256 byte sectors left in current */
224 static int SectorsLeftInRequest; /* i.e. blocks left in the thing mfm_request was called for */
225 static int Copy_Sector; /* The 256 byte sector we are currently at - fragments need to know
226 where to take over */
227 static char *Copy_buffer;
230 static void mfm_seek(void);
231 static void mfm_rerequest(void);
232 static void mfm_request(void);
233 static int mfm_reread_partitions(kdev_t dev);
234 static void mfm_specify (void);
235 static void issue_request(int dev, unsigned int block, unsigned int nsect,
236 struct request *req);
238 static unsigned int mfm_addr; /* Controller address */
239 static unsigned int mfm_IRQPollLoc; /* Address to read for IRQ information */
240 static unsigned int mfm_irqenable; /* Podule IRQ enable location */
241 static unsigned char mfm_irq; /* Interrupt number */
242 static int mfm_drives = 0; /* drives available */
243 static int mfm_status = 0; /* interrupt status */
246 static struct rawcmd {
248 unsigned int cylinder;
251 unsigned int cmdtype;
252 unsigned int cmdcode;
253 unsigned char cmddata[16];
257 static unsigned char result[16];
260 void (*interrupt) (void); /* interrupt handler */
261 void (*error) (void); /* error handler */
262 void (*redo) (void); /* redo handler */
263 void (*done) (int st); /* done handler */
267 static struct tq_struct mfm_tq = {0, 0, (void (*)(void *)) NULL, 0};
270 int number_mfm_drives = 1;
272 /* ------------------------------------------------------------------------------------------ */
274 * From the HD63463 data sheet from Hitachi Ltd.
277 #define MFM_COMMAND (mfm_addr + 0)
278 #define MFM_DATAOUT (mfm_addr + 1)
279 #define MFM_STATUS (mfm_addr + 8)
280 #define MFM_DATAIN (mfm_addr + 9)
282 #define CMD_ABT 0xF0 /* Abort */
283 #define CMD_SPC 0xE8 /* Specify */
284 #define CMD_TST 0xE0 /* Test */
285 #define CMD_RCLB 0xC8 /* Recalibrate */
286 #define CMD_SEK 0xC0 /* Seek */
287 #define CMD_WFS 0xAB /* Write Format Skew */
288 #define CMD_WFM 0xA3 /* Write Format */
289 #define CMD_MTB 0x90 /* Memory to buffer */
290 #define CMD_CMPD 0x88 /* Compare data */
291 #define CMD_WD 0x87 /* Write data */
292 #define CMD_RED 0x70 /* Read erroneous data */
293 #define CMD_RIS 0x68 /* Read ID skew */
294 #define CMD_FID 0x61 /* Find ID */
295 #define CMD_RID 0x60 /* Read ID */
296 #define CMD_BTM 0x50 /* Buffer to memory */
297 #define CMD_CKD 0x48 /* Check data */
298 #define CMD_RD 0x40 /* Read data */
299 #define CMD_OPBW 0x38 /* Open buffer write */
300 #define CMD_OPBR 0x30 /* Open buffer read */
301 #define CMD_CKV 0x28 /* Check drive */
302 #define CMD_CKE 0x20 /* Check ECC */
303 #define CMD_POD 0x18 /* Polling disable */
304 #define CMD_POL 0x10 /* Polling enable */
305 #define CMD_RCAL 0x08 /* Recall */
307 #define STAT_BSY 0x8000 /* Busy */
308 #define STAT_CPR 0x4000 /* Command Parameter Rejection */
309 #define STAT_CED 0x2000 /* Command end */
310 #define STAT_SED 0x1000 /* Seek end */
311 #define STAT_DER 0x0800 /* Drive error */
312 #define STAT_ABN 0x0400 /* Abnormal end */
313 #define STAT_POL 0x0200 /* Polling */
315 /* ------------------------------------------------------------------------------------------ */
317 static void console_printf(const char *fmt,...)
319 static char buffer[2048]; /* Arbitary! */
320 extern void console_print(const char *);
324 save_flags_cli(flags);
327 vsprintf(buffer, fmt, ap);
328 console_print(buffer);
331 restore_flags(flags);
332 }; /* console_printf */
334 #define DBG(x...) console_printf(x)
339 static void print_status(void)
342 static char *errors[] = {
359 "data field EEC error",
360 "data field CRC error",
362 "data field fatal error",
365 "ID field CRC error",
370 if (result[1] < 0x65)
371 error = errors[result[1] >> 2];
375 if (mfm_status & STAT_BSY) printk("BSY ");
376 if (mfm_status & STAT_CPR) printk("CPR ");
377 if (mfm_status & STAT_CED) printk("CED ");
378 if (mfm_status & STAT_SED) printk("SED ");
379 if (mfm_status & STAT_DER) printk("DER ");
380 if (mfm_status & STAT_ABN) printk("ABN ");
381 if (mfm_status & STAT_POL) printk("POL ");
382 printk(") SSB = %X (%s)\n", result[1], error);
386 /* ------------------------------------------------------------------------------------- */
388 static void issue_command(int command, unsigned char *cmdb, int len)
393 console_printf("issue_command: %02X: ", command);
394 for (i = 0; i < len; i++)
395 console_printf("%02X ", cmdb[i]);
396 console_printf("\n");
400 status = inw(MFM_STATUS);
401 } while (status & (STAT_BSY | STAT_POL));
402 DBG("issue_command: status after pol/bsy loop: %02X:\n ", status >> 8);
404 if (status & (STAT_CPR | STAT_CED | STAT_SED | STAT_DER | STAT_ABN)) {
405 outw(CMD_RCAL, MFM_COMMAND);
406 while (inw(MFM_STATUS) & STAT_BSY);
408 status = inw(MFM_STATUS);
409 DBG("issue_command: status before parameter issue: %02X:\n ", status >> 8);
412 outw(cmdb[1] | (cmdb[0] << 8), MFM_DATAOUT);
416 status = inw(MFM_STATUS);
417 DBG("issue_command: status before command issue: %02X:\n ", status >> 8);
419 outw(command, MFM_COMMAND);
420 status = inw(MFM_STATUS);
421 DBG("issue_command: status immediatly after command issue: %02X:\n ", status >> 8);
424 static void wait_for_completion(void)
426 while ((mfm_status = inw(MFM_STATUS)) & STAT_BSY);
429 static void wait_for_command_end(void)
433 while (!((mfm_status = inw(MFM_STATUS)) & STAT_CED));
435 for (i = 0; i < 16;) {
437 in = inw(MFM_DATAIN);
438 result[i++] = in >> 8;
441 outw (CMD_RCAL, MFM_COMMAND);
444 /* ------------------------------------------------------------------------------------- */
446 static void mfm_rw_intr(void)
448 int old_status; /* Holds status on entry, we read to see if the command just finished */
450 console_printf("mfm_rw_intr...dataleft=%d\n", hdc63463_dataleft);
454 /* Now don't handle the error until BSY drops */
455 if ((mfm_status & (STAT_DER | STAT_ABN)) && ((mfm_status&STAT_BSY)==0)) {
456 /* Something has gone wrong - let's try that again */
457 outw(CMD_RCAL, MFM_COMMAND); /* Clear interrupt condition */
459 DBG("mfm_rw_intr: DER/ABN err\n");
466 /* OK so what ever happend its not an error, now I reckon we are left between
467 a choice of command end or some data which is ready to be collected */
468 /* I think we have to transfer data while the interrupt line is on and its
469 not any other type of interrupt */
470 if (CURRENT->cmd == WRITE) {
471 extern void hdc63463_writedma(void);
472 if ((hdc63463_dataleft <= 0) && (!(mfm_status & STAT_CED))) {
473 printk("mfm_rw_intr: Apparent DMA write request when no more to DMA\n");
482 extern void hdc63463_readdma(void);
483 if ((hdc63463_dataleft <= 0) && (!(mfm_status & STAT_CED))) {
484 printk("mfm_rw_intr: Apparent DMA read request when no more to DMA\n");
491 DBG("Going to try read dma..............status=0x%x, buffer=%p\n", mfm_status, hdc63463_dataptr);
495 if (hdc63463_dataptr != ((unsigned int) Copy_buffer + 256)) {
496 /* If we didn't actually manage to get any data on this interrupt - but why? We got the interrupt */
497 /* Ah - well looking at the status its just when we get command end; so no problem */
498 /*console_printf("mfm: dataptr mismatch. dataptr=0x%08x Copy_buffer+256=0x%08p\n",
499 hdc63463_dataptr,Copy_buffer+256);
502 Sectors256LeftInCurrent--;
506 /* We have come to the end of this request */
507 if (!Sectors256LeftInCurrent) {
508 DBG("mfm: end_request for CURRENT=0x%p CURRENT(sector=%d current_nr_sectors=%d nr_sectors=%d)\n",
509 CURRENT, CURRENT->sector, CURRENT->current_nr_sectors, CURRENT->nr_sectors);
511 CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
512 CURRENT->sector += CURRENT->current_nr_sectors;
513 SectorsLeftInRequest -= CURRENT->current_nr_sectors;
516 if (SectorsLeftInRequest) {
517 hdc63463_dataptr = (unsigned int) CURRENT->buffer;
518 Copy_buffer = CURRENT->buffer;
519 Sectors256LeftInCurrent = CURRENT->current_nr_sectors * 2;
520 errors = &(CURRENT->errors);
521 /* These should match the present calculations of the next logical sector
523 Copy_Sector=CURRENT->sector*2; */
525 if (Copy_Sector != CURRENT->sector * 2)
527 /*console_printf*/printk("mfm: Copy_Sector mismatch. Copy_Sector=%d CURRENT->sector*2=%d\n",
528 Copy_Sector, CURRENT->sector * 2);
530 printk("mfm: Copy_Sector mismatch! Eek!\n");
533 }; /* Sectors256LeftInCurrent */
536 old_status = mfm_status;
537 mfm_status = inw(MFM_STATUS);
538 if (mfm_status & (STAT_DER | STAT_ABN)) {
539 /* Something has gone wrong - let's try that again */
541 DBG("mfm_rw_intr: DER/ABN error\n");
548 /* If this code wasn't entered due to command_end but there is
549 now a command end we must read the command results out. If it was
550 entered like this then mfm_interrupt_handler would have done the
552 if ((!((old_status & (STAT_CPR | STAT_BSY)) == STAT_CPR)) &&
553 ((mfm_status & (STAT_CPR | STAT_BSY)) == STAT_CPR)) {
557 in = inw(MFM_DATAIN);
558 result[len++] = in >> 8;
563 /*console_printf ("mfm_rw_intr nearexit [%02X]\n", __raw_readb(mfm_IRQPollLoc)); */
565 /* If end of command move on */
566 if (mfm_status & (STAT_CED)) {
567 outw(CMD_RCAL, MFM_COMMAND); /* Clear interrupt condition */
568 /* End of command - trigger the next command */
572 DBG("mfm_rw_intr: returned from cont->done\n");
574 /* Its going to generate another interrupt */
575 SET_INTR(mfm_rw_intr);
579 static void mfm_setup_rw(void)
581 DBG("setting up for rw...\n");
583 SET_INTR(mfm_rw_intr);
584 issue_command(raw_cmd.cmdcode, raw_cmd.cmddata, raw_cmd.cmdlen);
587 static void mfm_recal_intr(void)
590 console_printf("recal intr - status = ");
593 outw(CMD_RCAL, MFM_COMMAND); /* Clear interrupt condition */
594 if (mfm_status & (STAT_DER | STAT_ABN)) {
595 printk("recal failed\n");
596 MFM_DRV_INFO.cylinder = NEED_2_RECAL;
603 /* Thats seek end - we are finished */
604 if (mfm_status & STAT_SED) {
605 issue_command(CMD_POD, NULL, 0);
606 MFM_DRV_INFO.cylinder = 0;
610 /* Command end without seek end (see data sheet p.20) for parallel seek
611 - we have to send a POL command to wait for the seek */
612 if (mfm_status & STAT_CED) {
613 SET_INTR(mfm_recal_intr);
614 issue_command(CMD_POL, NULL, 0);
617 printk("recal: unknown status\n");
620 static void mfm_seek_intr(void)
623 console_printf("seek intr - status = ");
626 outw(CMD_RCAL, MFM_COMMAND); /* Clear interrupt condition */
627 if (mfm_status & (STAT_DER | STAT_ABN)) {
628 printk("seek failed\n");
629 MFM_DRV_INFO.cylinder = NEED_2_RECAL;
636 if (mfm_status & STAT_SED) {
637 issue_command(CMD_POD, NULL, 0);
638 MFM_DRV_INFO.cylinder = raw_cmd.cylinder;
642 if (mfm_status & STAT_CED) {
643 SET_INTR(mfm_seek_intr);
644 issue_command(CMD_POL, NULL, 0);
647 printk("seek: unknown status\n");
650 /* IDEA2 seems to work better - its what RiscOS sets my
651 * disc to - on its SECOND call to specify!
656 #define SPEC_SH 0xa9 /* Step pulse high=21, Record Length=001 (256 bytes) */
658 #define SPEC_SL 0x00 /* OM2 - SL - step pulse low */
659 #define SPEC_SH 0x21 /* Step pulse high=4, Record Length=001 (256 bytes) */
662 static void mfm_setupspecify (int drive, unsigned char *cmdb)
664 cmdb[0] = 0x1f; /* OM0 - !SECT,!MOD,!DIF,PADP,ECD,CRCP,CRCI,ACOR */
665 cmdb[1] = 0xc3; /* OM1 - DTM,BRST,!CEDM,!SEDM,!DERM,0,AMEX,PSK */
666 cmdb[2] = SPEC_SL; /* OM2 - SL - step pulse low */
667 cmdb[3] = (number_mfm_drives == 1) ? 0x02 : 0x06; /* 1 or 2 drives */
668 cmdb[4] = 0xfc | ((mfm_info[drive].cylinders - 1) >> 8);/* RW time over/high part of number of cylinders */
669 cmdb[5] = mfm_info[drive].cylinders - 1; /* low part of number of cylinders */
670 cmdb[6] = mfm_info[drive].heads - 1; /* Number of heads */
671 cmdb[7] = mfm_info[drive].sectors - 1; /* Number of sectors */
673 cmdb[9] = 0x0a; /* gap length 1 */
674 cmdb[10] = 0x0d; /* gap length 2 */
675 cmdb[11] = 0x0c; /* gap length 3 */
676 cmdb[12] = (mfm_info[drive].precomp - 1) >> 8; /* pre comp cylinder */
677 cmdb[13] = mfm_info[drive].precomp - 1;
678 cmdb[14] = (mfm_info[drive].lowcurrent - 1) >> 8; /* Low current cylinder */
679 cmdb[15] = mfm_info[drive].lowcurrent - 1;
682 static void mfm_specify (void)
684 unsigned char cmdb[16];
686 DBG("specify...dev=%d lastspecified=%d\n", raw_cmd.dev, lastspecifieddrive);
687 mfm_setupspecify (raw_cmd.dev, cmdb);
689 issue_command (CMD_SPC, cmdb, 16);
690 /* Ensure that we will do another specify if we move to the other drive */
691 lastspecifieddrive = raw_cmd.dev;
692 wait_for_completion();
695 static void mfm_seek(void)
697 unsigned char cmdb[4];
700 if (MFM_DRV_INFO.cylinder < 0) {
701 SET_INTR(mfm_recal_intr);
702 DBG("mfm_seek: about to call specify\n");
703 mfm_specify (); /* DAG added this */
705 cmdb[0] = raw_cmd.dev + 1;
708 issue_command(CMD_RCLB, cmdb, 2);
711 if (MFM_DRV_INFO.cylinder != raw_cmd.cylinder) {
712 cmdb[0] = raw_cmd.dev + 1;
713 cmdb[1] = 0; /* raw_cmd.head; DAG: My data sheet says this should be 0 */
714 cmdb[2] = raw_cmd.cylinder >> 8;
715 cmdb[3] = raw_cmd.cylinder;
717 SET_INTR(mfm_seek_intr);
718 issue_command(CMD_SEK, cmdb, 4);
723 static void mfm_initialise(void)
729 static void request_done(int uptodate)
731 DBG("mfm:request_done\n");
733 unsigned char block[2] = {0, 0};
735 /* Apparently worked - let's check bytes left to DMA */
736 if (hdc63463_dataleft != (PartFragRead_SectorsLeft * 256)) {
737 printk("mfm: request_done - dataleft=%d - should be %d - Eek!\n", hdc63463_dataleft, PartFragRead_SectorsLeft * 256);
741 /* Potentially this means that we've done; but we might be doing
742 a partial access, (over two cylinders) or we may have a number
743 of fragments in an image file. First let's deal with partial accesss
746 /* Yep - a partial access */
748 /* and issue the remainder */
749 issue_request(MINOR(CURRENT->rq_dev), PartFragRead_RestartBlock, PartFragRead_SectorsLeft, CURRENT);
753 /* ah well - perhaps there is another fragment to go */
755 /* Increment pointers/counts to start of next fragment */
756 if (SectorsLeftInRequest > 0) printk("mfm: SectorsLeftInRequest>0 - Eek! Shouldn't happen!\n");
758 /* No - its the end of the line */
759 /* end_request's should have happened at the end of sector DMAs */
760 /* Turns Drive LEDs off - may slow it down? */
762 issue_command(CMD_CKV, block, 2);
765 DBG("request_done: About to mfm_request\n");
766 /* Next one please */
767 mfm_request(); /* Moved from mfm_rw_intr */
768 DBG("request_done: returned from mfm_request\n");
770 printk("mfm:request_done: update=0\n");
776 static void error_handler(void)
778 printk("error detected... status = ");
781 if (*errors > MFM_DRV_INFO.errors.abort)
783 if (*errors > MFM_DRV_INFO.errors.recal)
784 MFM_DRV_INFO.cylinder = NEED_2_RECAL;
787 static void rw_interrupt(void)
789 printk("rw_interrupt\n");
792 static struct cont rw_cont =
801 * Actually gets round to issuing the request - note everything at this
802 * point is in 256 byte sectors not Linux 512 byte blocks
804 static void issue_request(int dev, unsigned int block, unsigned int nsect,
807 int track, start_head, start_sector;
808 int sectors_to_next_cyl;
812 track = block / mfm_info[dev].sectors;
813 start_sector = block % mfm_info[dev].sectors;
814 start_head = track % mfm_info[dev].heads;
816 /* First get the number of whole tracks which are free before the next
818 sectors_to_next_cyl = (mfm_info[dev].heads - (start_head + 1)) * mfm_info[dev].sectors;
819 /* Then add in the number of sectors left on this track */
820 sectors_to_next_cyl += (mfm_info[dev].sectors - start_sector);
822 DBG("issue_request: mfm_info[dev].sectors=%d track=%d\n", mfm_info[dev].sectors, track);
825 raw_cmd.sector = start_sector;
826 raw_cmd.head = start_head;
827 raw_cmd.cylinder = track / mfm_info[dev].heads;
828 raw_cmd.cmdtype = CURRENT->cmd;
829 raw_cmd.cmdcode = CURRENT->cmd == WRITE ? CMD_WD : CMD_RD;
830 raw_cmd.cmddata[0] = dev + 1; /* DAG: +1 to get US */
831 raw_cmd.cmddata[1] = raw_cmd.head;
832 raw_cmd.cmddata[2] = raw_cmd.cylinder >> 8;
833 raw_cmd.cmddata[3] = raw_cmd.cylinder;
834 raw_cmd.cmddata[4] = raw_cmd.head;
835 raw_cmd.cmddata[5] = raw_cmd.sector;
837 /* Was == and worked - how the heck??? */
838 if (lastspecifieddrive != raw_cmd.dev)
841 if (nsect <= sectors_to_next_cyl) {
842 raw_cmd.cmddata[6] = nsect >> 8;
843 raw_cmd.cmddata[7] = nsect;
844 PartFragRead = 0; /* All in one */
845 PartFragRead_SectorsLeft = 0; /* Must set this - used in DMA calcs */
847 raw_cmd.cmddata[6] = sectors_to_next_cyl >> 8;
848 raw_cmd.cmddata[7] = sectors_to_next_cyl;
849 PartFragRead = sectors_to_next_cyl; /* only do this many this time */
850 PartFragRead_RestartBlock = block + sectors_to_next_cyl; /* Where to restart from */
851 PartFragRead_SectorsLeft = nsect - sectors_to_next_cyl;
855 /* Setup DMA pointers */
856 hdc63463_dataptr = (unsigned int) Copy_buffer;
857 hdc63463_dataleft = nsect * 256; /* Better way? */
859 DBG("mfm%c: %sing: CHS=%d/%d/%d, sectors=%d, buffer=0x%08lx (%p)\n",
860 raw_cmd.dev + 'a', (CURRENT->cmd == READ) ? "read" : "writ",
863 raw_cmd.sector, nsect, (unsigned long) Copy_buffer, CURRENT);
866 errors = &(CURRENT->errors);
868 mfm_tq.routine = (void (*)(void *)) mfm_initialise;
869 queue_task(&mfm_tq, &tq_immediate);
870 mark_bh(IMMEDIATE_BH);
874 } /* issue_request */
877 * Called when an error has just happened - need to trick mfm_request
878 * into thinking we weren't busy
880 * Turn off ints - mfm_request expects them this way
882 static void mfm_rerequest(void)
884 DBG("mfm_rerequest\n");
890 static void mfm_request(void)
892 DBG("mfm_request CURRENT=%p Busy=%d\n", CURRENT, Busy);
895 DBG("mfm_request: Exited due to NULL Current 1\n");
899 if (CURRENT->rq_status == RQ_INACTIVE) {
900 /* Hmm - seems to be happening a lot on 1.3.45 */
901 /*console_printf("mfm_request: Exited due to INACTIVE Current\n"); */
905 /* If we are still processing then return; we will get called again */
907 /* Again seems to be common in 1.3.45 */
908 /*DBG*/printk("mfm_request: Exiting due to busy\n");
914 unsigned int dev, block, nsect;
916 DBG("mfm_request: loop start\n");
919 DBG("mfm_request: before INIT_REQUEST\n");
922 printk("mfm_request: Exiting due to !CURRENT (pre)\n");
930 DBG("mfm_request: before arg extraction\n");
932 dev = MINOR(CURRENT->rq_dev);
933 block = CURRENT->sector;
934 nsect = CURRENT->nr_sectors;
936 /*if ((dev>>6)==1) */ console_printf("mfm_request: raw vals: dev=%d (block=512 bytes) block=%d nblocks=%d\n", dev, block, nsect);
938 if (dev >= (mfm_drives << 6) ||
939 block >= mfm[dev].nr_sects || ((block+nsect) > mfm[dev].nr_sects)) {
940 if (dev >= (mfm_drives << 6))
941 printk("mfm: bad minor number: device=%s\n", kdevname(CURRENT->rq_dev));
943 printk("mfm%c: bad access: block=%d, count=%d, nr_sects=%ld\n", (dev >> 6)+'a',
944 block, nsect, mfm[dev].nr_sects);
945 printk("mfm: continue 1\n");
951 block += mfm[dev].start_sect;
953 /* DAG: Linux doesn't cope with this - even though it has an array telling
954 it the hardware block size - silly */
955 block <<= 1; /* Now in 256 byte sectors */
956 nsect <<= 1; /* Ditto */
958 SectorsLeftInRequest = nsect >> 1;
959 Sectors256LeftInCurrent = CURRENT->current_nr_sectors * 2;
960 Copy_buffer = CURRENT->buffer;
961 Copy_Sector = CURRENT->sector << 1;
963 DBG("mfm_request: block after offset=%d\n", block);
965 if (CURRENT->cmd != READ && CURRENT->cmd != WRITE) {
966 printk("unknown mfm-command %d\n", CURRENT->cmd);
969 printk("mfm: continue 4\n");
972 issue_request(dev, block, nsect, CURRENT);
976 DBG("mfm_request: Dropping out bottom\n");
979 static void do_mfm_request(request_queue_t *q)
981 DBG("do_mfm_request: about to mfm_request\n");
985 static void mfm_interrupt_handler(int unused, void *dev_id, struct pt_regs *regs)
987 void (*handler) (void) = DEVICE_INTR;
991 DBG("mfm_interrupt_handler (handler=0x%p)\n", handler);
993 mfm_status = inw(MFM_STATUS);
995 /* If CPR (Command Parameter Reject) and not busy it means that the command
996 has some return message to give us */
997 if ((mfm_status & (STAT_CPR | STAT_BSY)) == STAT_CPR) {
1001 in = inw(MFM_DATAIN);
1002 result[len++] = in >> 8;
1010 outw (CMD_RCAL, MFM_COMMAND); /* Clear interrupt condition */
1011 printk ("mfm: unexpected interrupt - status = ");
1021 * Tell the user about the drive if we decided it exists.
1023 static void mfm_geometry (int drive)
1025 if (mfm_info[drive].cylinders)
1026 printk ("mfm%c: %dMB CHS=%d/%d/%d LCC=%d RECOMP=%d\n", 'a' + drive,
1027 mfm_info[drive].cylinders * mfm_info[drive].heads * mfm_info[drive].sectors / 4096,
1028 mfm_info[drive].cylinders, mfm_info[drive].heads, mfm_info[drive].sectors,
1029 mfm_info[drive].lowcurrent, mfm_info[drive].precomp);
1032 #ifdef CONFIG_BLK_DEV_MFM_AUTODETECT
1034 * Attempt to detect a drive and find its geometry. The drive has already been
1037 * We first recalibrate the disk, then try to probe sectors, heads and then
1038 * cylinders. NOTE! the cylinder probe may break drives. The xd disk driver
1039 * does something along these lines, so I assume that most drives are up to
1040 * this mistreatment...
1042 static int mfm_detectdrive (int drive)
1044 unsigned int mingeo[3], maxgeo[3];
1045 unsigned int attribute, need_recal = 1;
1046 unsigned char cmdb[8];
1048 memset (mingeo, 0, sizeof (mingeo));
1049 maxgeo[0] = mfm_info[drive].sectors;
1050 maxgeo[1] = mfm_info[drive].heads;
1051 maxgeo[2] = mfm_info[drive].cylinders;
1053 cmdb[0] = drive + 1;
1056 for (attribute = 0; attribute < 3; attribute++) {
1057 while (mingeo[attribute] != maxgeo[attribute]) {
1058 unsigned int variable;
1060 variable = (maxgeo[attribute] + mingeo[attribute]) >> 1;
1061 cmdb[1] = cmdb[2] = cmdb[3] = cmdb[4] = cmdb[5] = 0;
1067 issue_command (CMD_RCLB, cmdb, 2);
1068 wait_for_completion ();
1069 wait_for_command_end ();
1070 if (result[1] == 0x20)
1072 } while (result[1] && --tries);
1074 outw (CMD_RCAL, MFM_COMMAND);
1080 switch (attribute) {
1083 issue_command (CMD_CMPD, cmdb, 8);
1088 issue_command (CMD_CMPD, cmdb, 8);
1091 cmdb[2] = variable >> 8;
1093 issue_command (CMD_SEK, cmdb, 4);
1096 wait_for_completion ();
1097 wait_for_command_end ();
1099 switch (result[1]) {
1102 mingeo[attribute] = variable + 1;
1106 outw (CMD_RCAL, MFM_COMMAND);
1112 maxgeo[attribute] = variable;
1117 mfm_info[drive].cylinders = mingeo[2];
1118 mfm_info[drive].lowcurrent = mingeo[2];
1119 mfm_info[drive].precomp = mingeo[2] / 2;
1120 mfm_info[drive].heads = mingeo[1];
1121 mfm_info[drive].sectors = mingeo[0];
1122 outw (CMD_RCAL, MFM_COMMAND);
1128 * Initialise all drive information for this controller.
1130 static int mfm_initdrives(void)
1134 if (number_mfm_drives > MFM_MAXDRIVES) {
1135 number_mfm_drives = MFM_MAXDRIVES;
1136 printk("No. of ADFS MFM drives is greater than MFM_MAXDRIVES - you can't have that many!\n");
1139 for (drive = 0; drive < number_mfm_drives; drive++) {
1140 mfm_info[drive].lowcurrent = 1;
1141 mfm_info[drive].precomp = 1;
1142 mfm_info[drive].cylinder = -1;
1143 mfm_info[drive].errors.recal = 0;
1144 mfm_info[drive].errors.report = 0;
1145 mfm_info[drive].errors.abort = 4;
1147 #ifdef CONFIG_BLK_DEV_MFM_AUTODETECT
1148 mfm_info[drive].cylinders = 1024;
1149 mfm_info[drive].heads = 8;
1150 mfm_info[drive].sectors = 64;
1152 unsigned char cmdb[16];
1154 mfm_setupspecify (drive, cmdb);
1156 issue_command (CMD_SPC, cmdb, 16);
1157 wait_for_completion ();
1158 if (!mfm_detectdrive (drive)) {
1159 mfm_info[drive].cylinders = 0;
1160 mfm_info[drive].heads = 0;
1161 mfm_info[drive].sectors = 0;
1163 cmdb[0] = cmdb[1] = 0;
1164 issue_command (CMD_CKV, cmdb, 2);
1167 mfm_info[drive].cylinders = 1; /* its going to have to figure it out from the partition info */
1168 mfm_info[drive].heads = 4;
1169 mfm_info[drive].sectors = 32;
1172 return number_mfm_drives;
1178 * The 'front' end of the mfm driver follows...
1181 static int mfm_ioctl(struct inode *inode, struct file *file, u_int cmd, u_long arg)
1183 struct hd_geometry *geo = (struct hd_geometry *) arg;
1185 int device, major, minor, err;
1187 if (!inode || !(dev = inode->i_rdev))
1193 device = DEVICE_NR(MINOR(inode->i_rdev)), err;
1194 if (device >= mfm_drives)
1201 if (put_user (mfm_info[device].heads, &geo->heads))
1203 if (put_user (mfm_info[device].sectors, &geo->sectors))
1205 if (put_user (mfm_info[device].cylinders, &geo->cylinders))
1207 if (put_user (mfm[minor].start_sect, &geo->start))
1212 if (!capable(CAP_SYS_ADMIN))
1214 max_readahead[major][minor] = arg;
1218 return put_user(max_readahead[major][minor], (long *) arg);
1221 return put_user(max_sectors[major][minor], (long *) arg);
1224 if (!capable(CAP_SYS_ADMIN))
1226 return mfm_reread_partitions(dev);
1236 return blk_ioctl(dev, cmd, arg);
1243 static int mfm_open(struct inode *inode, struct file *file)
1245 int dev = DEVICE_NR(MINOR(inode->i_rdev));
1247 if (dev >= mfm_drives)
1250 while (mfm_info[dev].busy)
1251 sleep_on (&mfm_wait_open);
1253 mfm_info[dev].access_count++;
1258 * Releasing a block device means we sync() it, so that it can safely
1259 * be forgotten about...
1261 static int mfm_release(struct inode *inode, struct file *file)
1263 mfm_info[DEVICE_NR(MINOR(inode->i_rdev))].access_count--;
1268 * This is to handle various kernel command line parameters
1269 * specific to this driver.
1271 void mfm_setup(char *str, int *ints)
1277 * Set the CHS from the ADFS boot block if it is present. This is not ideal
1278 * since if there are any non-ADFS partitions on the disk, this won't work!
1279 * Hence, I want to get rid of this...
1281 void xd_set_geometry(kdev_t dev, unsigned char secsptrack, unsigned char heads,
1282 unsigned long discsize, unsigned int secsize)
1284 int drive = MINOR(dev) >> 6;
1286 if (mfm_info[drive].cylinders == 1) {
1287 mfm_info[drive].sectors = secsptrack;
1288 mfm_info[drive].heads = heads;
1289 mfm_info[drive].cylinders = discsize / (secsptrack * heads * secsize);
1291 if ((heads < 1) || (mfm_info[drive].cylinders > 1024)) {
1292 printk("mfm%c: Insane disc shape! Setting to 512/4/32\n",'a' + (dev >> 6));
1294 /* These values are fairly arbitary, but are there so that if your
1295 * lucky you can pick apart your disc to find out what is going on -
1296 * I reckon these figures won't hurt MOST drives
1298 mfm_info[drive].sectors = 32;
1299 mfm_info[drive].heads = 4;
1300 mfm_info[drive].cylinders = 512;
1302 if (raw_cmd.dev == drive)
1304 mfm_geometry (drive);
1305 mfm[drive << 6].start_sect = 0;
1306 mfm[drive << 6].nr_sects = mfm_info[drive].cylinders * mfm_info[drive].heads * mfm_info[drive].sectors / 2;
1310 static struct gendisk mfm_gendisk = {
1317 real_devices: (void *)mfm_info,
1320 static struct block_device_operations mfm_fops =
1324 release: mfm_release,
1328 static void mfm_geninit (void)
1332 for (i = 0; i < (MFM_MAXDRIVES << 6); i++) {
1333 /* Can't increase this - if you do all hell breaks loose */
1334 mfm_blocksizes[i] = 1024;
1335 mfm_sectsizes[i] = 512;
1337 blksize_size[MAJOR_NR] = mfm_blocksizes;
1338 hardsect_size[MAJOR_NR] = mfm_sectsizes;
1340 mfm_drives = mfm_initdrives();
1342 printk("mfm: detected %d hard drive%s\n", mfm_drives,
1343 mfm_drives == 1 ? "" : "s");
1344 mfm_gendisk.nr_real = mfm_drives;
1346 if (request_irq(mfm_irq, mfm_interrupt_handler, SA_INTERRUPT, "MFM harddisk", NULL))
1347 printk("mfm: unable to get IRQ%d\n", mfm_irq);
1350 outw(0x80, mfm_irqenable); /* Required to enable IRQs from MFM podule */
1352 for (i = 0; i < mfm_drives; i++) {
1354 register_disk(&mfm_gendisk, MKDEV(MAJOR_NR,i<<6), 1<<6,
1356 mfm_info[i].cylinders * mfm_info[i].heads *
1357 mfm_info[i].sectors / 2);
1361 static struct expansion_card *ecs;
1364 * See if there is a controller at the address presently at mfm_addr
1366 * We check to see if the controller is busy - if it is, we abort it first,
1367 * and check that the chip is no longer busy after at least 180 clock cycles.
1368 * We then issue a command and check that the BSY or CPR bits are set.
1370 static int mfm_probecontroller (unsigned int mfm_addr)
1372 if (inw (MFM_STATUS) & STAT_BSY) {
1373 outw (CMD_ABT, MFM_COMMAND);
1375 if (inw (MFM_STATUS) & STAT_BSY)
1379 if (inw (MFM_STATUS) & STAT_CED)
1380 outw (CMD_RCAL, MFM_COMMAND);
1382 outw (CMD_SEK, MFM_COMMAND);
1384 if (inw (MFM_STATUS) & (STAT_BSY | STAT_CPR)) {
1385 unsigned int count = 2000;
1386 while (inw (MFM_STATUS) & STAT_BSY) {
1392 outw (CMD_RCAL, MFM_COMMAND);
1398 * Look for a MFM controller - first check the motherboard, then the podules
1399 * The podules have an extra interrupt enable that needs to be played with
1401 * The HDC is accessed at MEDIUM IOC speeds.
1405 unsigned char irqmask;
1407 if (mfm_probecontroller(ONBOARD_MFM_ADDRESS)) {
1408 mfm_addr = ONBOARD_MFM_ADDRESS;
1409 mfm_IRQPollLoc = IOC_IRQSTATB;
1411 mfm_irq = IRQ_HARDDISK;
1412 irqmask = 0x08; /* IL3 pin */
1414 ecs = ecard_find(0, mfm_cids);
1420 mfm_addr = ecard_address(ecs, ECARD_IOC, ECARD_MEDIUM) + 0x800;
1421 mfm_IRQPollLoc = ioaddr(mfm_addr + 0x400);
1422 mfm_irqenable = mfm_IRQPollLoc;
1429 printk("mfm: found at address %08X, interrupt %d\n", mfm_addr, mfm_irq);
1430 if (!request_region (mfm_addr, 10, "mfm")) {
1435 if (register_blkdev(MAJOR_NR, "mfm", &mfm_fops)) {
1436 printk("mfm_init: unable to get major number %d\n", MAJOR_NR);
1438 release_region(mfm_addr, 10);
1442 /* Stuff for the assembler routines to get to */
1443 hdc63463_baseaddress = ioaddr(mfm_addr);
1444 hdc63463_irqpolladdress = mfm_IRQPollLoc;
1445 hdc63463_irqpollmask = irqmask;
1447 blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
1448 read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB?) read ahread */
1450 add_gendisk(&mfm_gendisk);
1453 lastspecifieddrive = -1;
1460 * This routine is called to flush all partitions and partition tables
1461 * for a changed MFM disk, and then re-read the new partition table.
1462 * If we are revalidating due to an ioctl, we have USAGE == 1.
1464 static int mfm_reread_partitions(kdev_t dev)
1466 unsigned int start, i, maxp, target = DEVICE_NR(MINOR(dev));
1467 unsigned long flags;
1469 save_flags_cli(flags);
1470 if (mfm_info[target].busy || mfm_info[target].access_count > 1) {
1471 restore_flags (flags);
1474 mfm_info[target].busy = 1;
1475 restore_flags (flags);
1477 maxp = mfm_gendisk.max_p;
1478 start = target << mfm_gendisk.minor_shift;
1480 for (i = maxp - 1; i >= 0; i--) {
1481 int minor = start + i;
1482 invalidate_device (MKDEV(MAJOR_NR, minor), 1);
1483 mfm_gendisk.part[minor].start_sect = 0;
1484 mfm_gendisk.part[minor].nr_sects = 0;
1487 /* Divide by 2, since sectors are 2 times smaller than usual ;-) */
1489 grok_partitions(&mfm_gendisk, target, 1<<6, mfm_info[target].heads *
1490 mfm_info[target].cylinders * mfm_info[target].sectors / 2);
1492 mfm_info[target].busy = 0;
1493 wake_up (&mfm_wait_open);
1500 MODULE_LICENSE("GPL");
1502 int init_module(void)
1507 void cleanup_module(void)
1509 if (ecs && mfm_irqenable)
1510 outw (0, mfm_irqenable); /* Required to enable IRQs from MFM podule */
1511 free_irq(mfm_irq, NULL);
1512 unregister_blkdev(MAJOR_NR, "mfm");
1513 del_gendisk(&mfm_gendisk);
1517 release_region(mfm_addr, 10);