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1.1 root 1: /*
2: * linux/drivers/block/ide.h
3: *
4: * Copyright (C) 1994, 1995 Linus Torvalds & authors
5: */
6:
7: #include <linux/config.h>
8:
9: /*
10: * This is the multiple IDE interface driver, as evolved from hd.c.
11: * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
12: * There can be up to two drives per interface, as per the ATA-2 spec.
13: *
14: * Primary i/f: ide0: major=3; (hda) minor=0; (hdb) minor=64
15: * Secondary i/f: ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
16: * Tertiary i/f: ide2: major=33; (hde) minor=0; (hdf) minor=64
17: * Quaternary i/f: ide3: major=34; (hdg) minor=0; (hdh) minor=64
18: */
19:
20: /******************************************************************************
21: * IDE driver configuration options (play with these as desired):
22: *
23: * REALLY_SLOW_IO can be defined in ide.c and ide-cd.c, if necessary
24: */
25: #undef REALLY_FAST_IO /* define if ide ports are perfect */
26: #define INITIAL_MULT_COUNT 0 /* off=0; on=2,4,8,16,32, etc.. */
27:
28: #ifndef SUPPORT_SLOW_DATA_PORTS /* 1 to support slow data ports */
29: #define SUPPORT_SLOW_DATA_PORTS 1 /* 0 to reduce kernel size */
30: #endif
31: #ifndef SUPPORT_VLB_SYNC /* 1 to support weird 32-bit chips */
32: #define SUPPORT_VLB_SYNC 1 /* 0 to reduce kernel size */
33: #endif
34: #ifndef DISK_RECOVERY_TIME /* off=0; on=access_delay_time */
35: #define DISK_RECOVERY_TIME 0 /* for hardware that needs it */
36: #endif
37: #ifndef OK_TO_RESET_CONTROLLER /* 1 needed for good error recovery */
38: #define OK_TO_RESET_CONTROLLER 1 /* 0 for use with AH2372A/B interface */
39: #endif
40: #ifndef FAKE_FDISK_FOR_EZDRIVE /* 1 to help linux fdisk with EZDRIVE */
41: #define FAKE_FDISK_FOR_EZDRIVE 1 /* 0 to reduce kernel size */
42: #endif
43: #ifndef FANCY_STATUS_DUMPS /* 1 for human-readable drive errors */
44: #define FANCY_STATUS_DUMPS 1 /* 0 to reduce kernel size */
45: #endif
46:
47: #ifdef CONFIG_BLK_DEV_CMD640
48: #if 0 /* change to 1 when debugging cmd640 problems */
49: void cmd640_dump_regs (void);
50: #define CMD640_DUMP_REGS cmd640_dump_regs() /* for debugging cmd640 chipset */
51: #endif
52: #endif /* CONFIG_BLK_DEV_CMD640 */
53:
54: #if defined(CONFIG_BLK_DEV_IDECD) || defined(CONFIG_BLK_DEV_IDETAPE) || \
55: defined(CONFIG_BLK_DEV_IDEFLOPPY) || defined(CONFIG_BLK_DEV_IDESCSI)
56: #define CONFIG_BLK_DEV_IDEATAPI 1
57: #endif
58:
59: /*
60: * IDE_DRIVE_CMD is used to implement many features of the hdparm utility
61: */
62: #define IDE_DRIVE_CMD 99 /* (magic) undef to reduce kernel size*/
63:
64: /*
65: * "No user-serviceable parts" beyond this point :)
66: *****************************************************************************/
67:
68: #if defined(CONFIG_BLK_DEV_IDESCSI) && !defined(CONFIG_SCSI)
69: #error "SCSI must also be selected"
70: #endif
71:
72: typedef unsigned char byte; /* used everywhere */
73:
74: /*
75: * Probably not wise to fiddle with these
76: */
77: #define ERROR_MAX 8 /* Max read/write errors per sector */
78: #define ERROR_RESET 3 /* Reset controller every 4th retry */
79: #define ERROR_RECAL 1 /* Recalibrate every 2nd retry */
80:
81: /*
82: * Ensure that various configuration flags have compatible settings
83: */
84: #ifdef REALLY_SLOW_IO
85: #undef REALLY_FAST_IO
86: #endif
87:
88: /*
89: * Definitions for accessing IDE controller registers
90: */
91:
92: #define HWIF(drive) ((ide_hwif_t *)((drive)->hwif))
93: #define HWGROUP(drive) ((ide_hwgroup_t *)(HWIF(drive)->hwgroup))
94:
95: #define IDE_DATA_OFFSET (0)
96: #define IDE_ERROR_OFFSET (1)
97: #define IDE_NSECTOR_OFFSET (2)
98: #define IDE_SECTOR_OFFSET (3)
99: #define IDE_LCYL_OFFSET (4)
100: #define IDE_HCYL_OFFSET (5)
101: #define IDE_SELECT_OFFSET (6)
102: #define IDE_STATUS_OFFSET (7)
103: #define IDE_FEATURE_OFFSET IDE_ERROR_OFFSET
104: #define IDE_COMMAND_OFFSET IDE_STATUS_OFFSET
105:
106: #define IDE_DATA_REG (HWIF(drive)->io_base+IDE_DATA_OFFSET)
107: #define IDE_ERROR_REG (HWIF(drive)->io_base+IDE_ERROR_OFFSET)
108: #define IDE_NSECTOR_REG (HWIF(drive)->io_base+IDE_NSECTOR_OFFSET)
109: #define IDE_SECTOR_REG (HWIF(drive)->io_base+IDE_SECTOR_OFFSET)
110: #define IDE_LCYL_REG (HWIF(drive)->io_base+IDE_LCYL_OFFSET)
111: #define IDE_HCYL_REG (HWIF(drive)->io_base+IDE_HCYL_OFFSET)
112: #define IDE_SELECT_REG (HWIF(drive)->io_base+IDE_SELECT_OFFSET)
113: #define IDE_STATUS_REG (HWIF(drive)->io_base+IDE_STATUS_OFFSET)
114: #define IDE_CONTROL_REG (HWIF(drive)->ctl_port)
115: #define IDE_FEATURE_REG IDE_ERROR_REG
116: #define IDE_COMMAND_REG IDE_STATUS_REG
117: #define IDE_ALTSTATUS_REG IDE_CONTROL_REG
118: #define IDE_IREASON_REG IDE_NSECTOR_REG
119: #define IDE_BCOUNTL_REG IDE_LCYL_REG
120: #define IDE_BCOUNTH_REG IDE_HCYL_REG
121:
122: #ifdef REALLY_FAST_IO
123: #define OUT_BYTE(b,p) outb((b),(p))
124: #define IN_BYTE(p) (byte)inb(p)
125: #else
126: #define OUT_BYTE(b,p) outb_p((b),(p))
127: #define IN_BYTE(p) (byte)inb_p(p)
128: #endif /* REALLY_FAST_IO */
129:
130: #define GET_ERR() IN_BYTE(IDE_ERROR_REG)
131: #define GET_STAT() IN_BYTE(IDE_STATUS_REG)
132: #define OK_STAT(stat,good,bad) (((stat)&((good)|(bad)))==(good))
133: #define BAD_R_STAT (BUSY_STAT | ERR_STAT)
134: #define BAD_W_STAT (BAD_R_STAT | WRERR_STAT)
135: #define BAD_STAT (BAD_R_STAT | DRQ_STAT)
136: #define DRIVE_READY (READY_STAT | SEEK_STAT)
137: #define DATA_READY (DRQ_STAT)
138:
139: /*
140: * Some more useful definitions
141: */
142: #define IDE_MAJOR_NAME "ide" /* the same for all i/f; see also genhd.c */
143: #define MAJOR_NAME IDE_MAJOR_NAME
144: #define PARTN_BITS 6 /* number of minor dev bits for partitions */
145: #define PARTN_MASK ((1<<PARTN_BITS)-1) /* a useful bit mask */
146: #define MAX_DRIVES 2 /* per interface; 2 assumed by lots of code */
147: #ifndef MAX_HWIFS
148: #define MAX_HWIFS 4 /* an arbitrary, but realistic limit */
149: #endif
150: #define SECTOR_WORDS (512 / 4) /* number of 32bit words per sector */
151:
152: /*
153: * Timeouts for various operations:
154: */
155: #define WAIT_DRQ (5*HZ/100) /* 50msec - spec allows up to 20ms */
156: #ifdef CONFIG_APM
157: #define WAIT_READY (5*HZ) /* 5sec - some laptops are very slow */
158: #else
159: #define WAIT_READY (3*HZ/100) /* 30msec - should be instantaneous */
160: #endif /* CONFIG_APM */
161: #define WAIT_PIDENTIFY (1*HZ) /* 1sec - should be less than 3ms (?) */
162: #define WAIT_WORSTCASE (30*HZ) /* 30sec - worst case when spinning up */
163: #define WAIT_CMD (10*HZ) /* 10sec - maximum wait for an IRQ to happen */
164:
165: #if defined(CONFIG_BLK_DEV_HT6560B) || defined(CONFIG_BLK_DEV_PROMISE)
166: #define SELECT_DRIVE(hwif,drive) \
167: { \
168: if (hwif->selectproc) \
169: hwif->selectproc(drive); \
170: else \
171: OUT_BYTE((drive)->select.all, hwif->io_base+IDE_SELECT_OFFSET); \
172: }
173: #else
174: #define SELECT_DRIVE(hwif,drive) OUT_BYTE((drive)->select.all, hwif->io_base+IDE_SELECT_OFFSET);
175: #endif /* CONFIG_BLK_DEV_HT6560B || CONFIG_BLK_DEV_PROMISE */
176:
177: #ifdef CONFIG_BLK_DEV_IDETAPE
178: #include "ide-tape.h"
179: #endif /* CONFIG_BLK_DEV_IDETAPE */
180:
181: #ifdef CONFIG_BLK_DEV_IDECD
182:
183: struct atapi_request_sense {
184: unsigned char error_code : 7;
185: unsigned char valid : 1;
186: byte reserved1;
187: unsigned char sense_key : 4;
188: unsigned char reserved2 : 1;
189: unsigned char ili : 1;
190: unsigned char reserved3 : 2;
191: byte info[4];
192: byte sense_len;
193: byte command_info[4];
194: byte asc;
195: byte ascq;
196: byte fru;
197: byte sense_key_specific[3];
198: };
199:
200: struct packet_command {
201: char *buffer;
202: int buflen;
203: int stat;
204: struct atapi_request_sense *sense_data;
205: unsigned char c[12];
206: };
207:
208:
209: /* Structure of a MSF cdrom address. */
210: struct atapi_msf {
211: byte reserved;
212: byte minute;
213: byte second;
214: byte frame;
215: };
216:
217:
218: /* Space to hold the disk TOC. */
219:
220: #define MAX_TRACKS 99
221: struct atapi_toc_header {
222: unsigned short toc_length;
223: byte first_track;
224: byte last_track;
225: };
226:
227: struct atapi_toc_entry {
228: byte reserved1;
229: unsigned control : 4;
230: unsigned adr : 4;
231: byte track;
232: byte reserved2;
233: union {
234: unsigned lba;
235: struct atapi_msf msf;
236: } addr;
237: };
238:
239: struct atapi_toc {
240: int last_session_lba;
241: int xa_flag;
242: unsigned capacity;
243: struct atapi_toc_header hdr;
244: struct atapi_toc_entry ent[MAX_TRACKS+1];
245: /* One extra for the leadout. */
246: };
247:
248:
249: /* This structure is annoyingly close to, but not identical with,
250: the cdrom_subchnl structure from cdrom.h. */
251: struct atapi_cdrom_subchnl
252: {
253: u_char acdsc_reserved;
254: u_char acdsc_audiostatus;
255: u_short acdsc_length;
256: u_char acdsc_format;
257:
258: u_char acdsc_adr: 4;
259: u_char acdsc_ctrl: 4;
260: u_char acdsc_trk;
261: u_char acdsc_ind;
262: union {
263: struct atapi_msf msf;
264: int lba;
265: } acdsc_absaddr;
266: union {
267: struct atapi_msf msf;
268: int lba;
269: } acdsc_reladdr;
270: };
271:
272:
273: /* Extra per-device info for cdrom drives. */
274: struct cdrom_info {
275:
276: /* Buffer for table of contents. NULL if we haven't allocated
277: a TOC buffer for this device yet. */
278:
279: struct atapi_toc *toc;
280:
281: /* Sector buffer. If a read request wants only the first part
282: of a cdrom block, we cache the rest of the block here,
283: in the expectation that that data is going to be wanted soon.
284: SECTOR_BUFFERED is the number of the first buffered sector,
285: and NSECTORS_BUFFERED is the number of sectors in the buffer.
286: Before the buffer is allocated, we should have
287: SECTOR_BUFFER == NULL and NSECTORS_BUFFERED == 0. */
288:
289: unsigned long sector_buffered;
290: unsigned long nsectors_buffered;
291: char *sector_buffer;
292:
293: /* The result of the last successful request sense command
294: on this device. */
295: struct atapi_request_sense sense_data;
296:
297: int max_sectors;
298: };
299:
300: #endif /* CONFIG_BLK_DEV_IDECD */
301:
302: /*
303: * Now for the data we need to maintain per-drive: ide_drive_t
304: */
305:
306: typedef enum {ide_disk, ide_cdrom, ide_tape, ide_floppy, ide_scsi} ide_media_t;
307:
308: typedef union {
309: unsigned all : 8; /* all of the bits together */
310: struct {
311: unsigned set_geometry : 1; /* respecify drive geometry */
312: unsigned recalibrate : 1; /* seek to cyl 0 */
313: unsigned set_multmode : 1; /* set multmode count */
314: unsigned set_tune : 1; /* tune interface for drive */
315: unsigned mc : 1; /* acknowledge media change */
316: unsigned reserved : 3; /* unused */
317: } b;
318: } special_t;
319:
320: typedef union {
321: unsigned all : 8; /* all of the bits together */
322: struct {
323: unsigned head : 4; /* always zeros here */
324: unsigned unit : 1; /* drive select number, 0 or 1 */
325: unsigned bit5 : 1; /* always 1 */
326: unsigned lba : 1; /* using LBA instead of CHS */
327: unsigned bit7 : 1; /* always 1 */
328: } b;
329: } select_t;
330:
331: typedef struct ide_drive_s {
332: special_t special; /* special action flags */
333: unsigned present : 1; /* drive is physically present */
334: unsigned noprobe : 1; /* from: hdx=noprobe */
335: unsigned keep_settings : 1; /* restore settings after drive reset */
336: unsigned busy : 1; /* currently doing revalidate_disk() */
337: unsigned removable : 1; /* 1 if need to do check_media_change */
338: unsigned using_dma : 1; /* disk is using dma for read/write */
339: unsigned forced_geom : 1; /* 1 if hdx=c,h,s was given at boot */
340: unsigned unmask : 1; /* flag: okay to unmask other irqs */
341: unsigned no_unmask : 1; /* disallow setting unmask bit */
342: unsigned no_io_32bit : 1; /* disallow enabling 32bit I/O */
343: unsigned nobios : 1; /* flag: do not probe bios for drive */
344: unsigned slow : 1; /* flag: slow data port */
345: unsigned autotune : 2; /* 1=autotune, 2=noautotune, 0=default */
346: #if FAKE_FDISK_FOR_EZDRIVE
347: unsigned remap_0_to_1 : 1; /* flag: partitioned with ezdrive */
348: #endif /* FAKE_FDISK_FOR_EZDRIVE */
349: unsigned no_geom : 1; /* flag: do not set geometry */
350: ide_media_t media; /* disk, cdrom, tape, floppy */
351: select_t select; /* basic drive/head select reg value */
352: byte ctl; /* "normal" value for IDE_CONTROL_REG */
353: byte ready_stat; /* min status value for drive ready */
354: byte mult_count; /* current multiple sector setting */
355: byte mult_req; /* requested multiple sector setting */
356: byte tune_req; /* requested drive tuning setting */
357: byte io_32bit; /* 0=16-bit, 1=32-bit, 2/3=32bit+sync */
358: byte bad_wstat; /* used for ignoring WRERR_STAT */
359: byte sect0; /* offset of first sector for DM6:DDO */
360: byte usage; /* current "open()" count for drive */
361: byte head; /* "real" number of heads */
362: byte sect; /* "real" sectors per track */
363: byte bios_head; /* BIOS/fdisk/LILO number of heads */
364: byte bios_sect; /* BIOS/fdisk/LILO sectors per track */
365: unsigned short bios_cyl; /* BIOS/fdisk/LILO number of cyls */
366: unsigned short cyl; /* "real" number of cyls */
367: void *hwif; /* actually (ide_hwif_t *) */
368: struct wait_queue *wqueue; /* used to wait for drive in open() */
369: struct hd_driveid *id; /* drive model identification info */
370: struct hd_struct *part; /* drive partition table */
371: char name[4]; /* drive name, such as "hda" */
372: #ifdef CONFIG_BLK_DEV_IDECD
373: struct cdrom_info cdrom_info; /* for ide-cd.c */
374: #endif /* CONFIG_BLK_DEV_IDECD */
375: #ifdef CONFIG_BLK_DEV_IDETAPE
376: idetape_tape_t tape; /* for ide-tape.c */
377: #endif /* CONFIG_BLK_DEV_IDETAPE */
378: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
379: void *floppy; /* for ide-floppy.c */
380: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
381: #ifdef CONFIG_BLK_DEV_IDESCSI
382: void *scsi; /* for ide-scsi.c */
383: #endif /* CONFIG_BLK_DEV_IDESCSI */
384: byte ide_scsi; /* use ide-scsi driver */
385: } ide_drive_t;
386:
387: /*
388: * An ide_dmaproc_t() initiates/aborts DMA read/write operations on a drive.
389: *
390: * The caller is assumed to have selected the drive and programmed the drive's
391: * sector address using CHS or LBA. All that remains is to prepare for DMA
392: * and then issue the actual read/write DMA/PIO command to the drive.
393: *
394: * Returns 0 if all went well.
395: * Returns 1 if DMA read/write could not be started, in which case the caller
396: * should either try again later, or revert to PIO for the current request.
397: */
398: typedef enum { ide_dma_read = 0, ide_dma_write = 1,
399: ide_dma_abort = 2, ide_dma_check = 3,
400: ide_dma_status_bad = 4, ide_dma_transferred = 5,
401: ide_dma_begin = 6 }
402: ide_dma_action_t;
403:
404: typedef int (ide_dmaproc_t)(ide_dma_action_t, ide_drive_t *);
405:
406:
407: /*
408: * An ide_tuneproc_t() is used to set the speed of an IDE interface
409: * to a particular PIO mode. The "byte" parameter is used
410: * to select the PIO mode by number (0,1,2,3,4,5), and a value of 255
411: * indicates that the interface driver should "auto-tune" the PIO mode
412: * according to the drive capabilities in drive->id;
413: *
414: * Not all interface types support tuning, and not all of those
415: * support all possible PIO settings. They may silently ignore
416: * or round values as they see fit.
417: */
418: typedef void (ide_tuneproc_t)(ide_drive_t *, byte);
419:
420: /*
421: * This is used to provide HT6560B & PROMISE interface support.
422: */
423: typedef void (ide_selectproc_t) (ide_drive_t *);
424:
425: /*
426: * hwif_chipset_t is used to keep track of the specific hardware
427: * chipset used by each IDE interface, if known.
428: */
429: typedef enum { ide_unknown, ide_generic, ide_triton,
430: ide_cmd640, ide_dtc2278, ide_ali14xx,
431: ide_qd6580, ide_umc8672, ide_ht6560b,
432: ide_promise, ide_promise_udma }
433: hwif_chipset_t;
434:
435: typedef struct hwif_s {
436: struct hwif_s *next; /* for linked-list in ide_hwgroup_t */
437: void *hwgroup; /* actually (ide_hwgroup_t *) */
438: unsigned short io_base; /* base io port addr */
439: unsigned short ctl_port; /* usually io_base+0x206 */
440: ide_drive_t drives[MAX_DRIVES]; /* drive info */
441: struct gendisk *gd; /* gendisk structure */
442: ide_tuneproc_t *tuneproc; /* routine to tune PIO mode for drives */
443: #if defined(CONFIG_BLK_DEV_HT6560B) || defined(CONFIG_BLK_DEV_PROMISE)
444: ide_selectproc_t *selectproc; /* tweaks hardware to select drive */
445: #endif
446: ide_dmaproc_t *dmaproc; /* dma read/write/abort routine */
447: unsigned long *dmatable; /* dma physical region descriptor table */
448: unsigned short dma_base; /* base addr for dma ports (triton) */
449: byte irq; /* our irq number */
450: byte major; /* our major number */
451: char name[5]; /* name of interface, eg. "ide0" */
452: byte index; /* 0 for ide0; 1 for ide1; ... */
453: hwif_chipset_t chipset; /* sub-module for tuning.. */
454: unsigned noprobe : 1; /* don't probe for this interface */
455: unsigned present : 1; /* this interface exists */
456: unsigned serialized : 1; /* serialized operation with mate hwif */
457: unsigned sharing_irq: 1; /* 1 = sharing irq with another hwif */
458: #ifdef CONFIG_BLK_DEV_PROMISE
459: unsigned is_promise2: 1; /* 2nd i/f on promise DC4030 */
460: #endif /* CONFIG_BLK_DEV_PROMISE */
461: #if (DISK_RECOVERY_TIME > 0)
462: unsigned long last_time; /* time when previous rq was done */
463: #endif
464: #ifdef CONFIG_BLK_DEV_IDECD
465: struct request request_sense_request; /* from ide-cd.c */
466: struct packet_command request_sense_pc; /* from ide-cd.c */
467: #endif /* CONFIG_BLK_DEV_IDECD */
468: #ifdef CONFIG_BLK_DEV_IDETAPE
469: ide_drive_t *tape_drive; /* Pointer to the tape on this interface */
470: #endif /* CONFIG_BLK_DEV_IDETAPE */
471: } ide_hwif_t;
472:
473: /*
474: * internal ide interrupt handler type
475: */
476: typedef void (ide_handler_t)(ide_drive_t *);
477:
478: typedef struct hwgroup_s {
479: ide_handler_t *handler;/* irq handler, if active */
480: ide_drive_t *drive; /* current drive */
481: ide_hwif_t *hwif; /* ptr to current hwif in linked-list */
482: ide_hwif_t *next_hwif; /* next selected hwif (for tape) */
483: struct request *rq; /* current request */
484: struct timer_list timer; /* failsafe timer */
485: struct request wrq; /* local copy of current write rq */
486: unsigned long poll_timeout; /* timeout value during long polls */
487: int active; /* set when servicing requests */
488: } ide_hwgroup_t;
489:
490: /*
491: * ide_hwifs[] is the master data structure used to keep track
492: * of just about everything in ide.c. Whenever possible, routines
493: * should be using pointers to a drive (ide_drive_t *) or
494: * pointers to a hwif (ide_hwif_t *), rather than indexing this
495: * structure directly (the allocation/layout may change!).
496: *
497: */
498: #ifndef _IDE_C
499: extern ide_hwif_t ide_hwifs[]; /* master data repository */
500: #endif
501:
502: /*
503: * One final include file, which references some of the data/defns from above
504: */
505: #define IDE_DRIVER /* "parameter" for blk.h */
506: #include <linux/blk.h>
507:
508: #if (DISK_RECOVERY_TIME > 0)
509: void ide_set_recovery_timer (ide_hwif_t *);
510: #define SET_RECOVERY_TIMER(drive) ide_set_recovery_timer (drive)
511: #else
512: #define SET_RECOVERY_TIMER(drive)
513: #endif
514:
515: /*
516: * This is used for (nearly) all data transfers from the IDE interface
517: */
518: void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
519:
520: /*
521: * This is used for (nearly) all data transfers to the IDE interface
522: */
523: void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
524:
525: /*
526: * This is used for (nearly) all ATAPI data transfers from/to the IDE interface
527: */
528: void atapi_input_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount);
529: void atapi_output_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount);
530:
531: /*
532: * This is used on exit from the driver, to designate the next irq handler
533: * and also to start the safety timer.
534: */
535: void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout);
536:
537: /*
538: * Error reporting, in human readable form (luxurious, but a memory hog).
539: */
540: byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat);
541:
542: /*
543: * ide_error() takes action based on the error returned by the controller.
544: * The calling function must return afterwards, to restart the request.
545: */
546: void ide_error (ide_drive_t *drive, const char *msg, byte stat);
547:
548: /*
549: * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
550: * removing leading/trailing blanks and compressing internal blanks.
551: * It is primarily used to tidy up the model name/number fields as
552: * returned by the WIN_[P]IDENTIFY commands.
553: */
554: void ide_fixstring (byte *s, const int bytecount, const int byteswap);
555:
556: /*
557: * This routine busy-waits for the drive status to be not "busy".
558: * It then checks the status for all of the "good" bits and none
559: * of the "bad" bits, and if all is okay it returns 0. All other
560: * cases return 1 after invoking ide_error() -- caller should return.
561: *
562: */
563: int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout);
564:
565: /*
566: * This routine is called from the partition-table code in genhd.c
567: * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
568: *
569: * The second parameter, "xparm", determines exactly how the translation
570: * will be handled:
571: * 0 = convert to CHS with fewer than 1024 cyls
572: * using the same method as Ontrack DiskManager.
573: * 1 = same as "0", plus offset everything by 63 sectors.
574: * -1 = similar to "0", plus redirect sector 0 to sector 1.
575: * >1 = convert to a CHS geometry with "xparm" heads.
576: *
577: * Returns 0 if the translation was not possible, if the device was not
578: * an IDE disk drive, or if a geometry was "forced" on the commandline.
579: * Returns 1 if the geometry translation was successful.
580: */
581: int ide_xlate_1024 (kdev_t, int, const char *);
582:
583: /*
584: * Start a reset operation for an IDE interface.
585: * The caller should return immediately after invoking this.
586: */
587: void ide_do_reset (ide_drive_t *);
588:
589: /*
590: * This function is intended to be used prior to invoking ide_do_drive_cmd().
591: */
592: void ide_init_drive_cmd (struct request *rq);
593:
594: /*
595: * "action" parameter type for ide_do_drive_cmd() below.
596: */
597: typedef enum
598: {ide_wait, /* insert rq at end of list, and wait for it */
599: ide_next, /* insert rq immediately after current request */
600: ide_preempt, /* insert rq in front of current request */
601: ide_end} /* insert rq at end of list, but don't wait for it */
602: ide_action_t;
603:
604: /*
605: * This function issues a special IDE device request
606: * onto the request queue.
607: *
608: * If action is ide_wait, then the rq is queued at the end of the
609: * request queue, and the function sleeps until it has been processed.
610: * This is for use when invoked from an ioctl handler.
611: *
612: * If action is ide_preempt, then the rq is queued at the head of
613: * the request queue, displacing the currently-being-processed
614: * request and this function returns immediately without waiting
615: * for the new rq to be completed. This is VERY DANGEROUS, and is
616: * intended for careful use by the ATAPI tape/cdrom driver code.
617: *
618: * If action is ide_next, then the rq is queued immediately after
619: * the currently-being-processed-request (if any), and the function
620: * returns without waiting for the new rq to be completed. As above,
621: * This is VERY DANGEROUS, and is intended for careful use by the
622: * ATAPI tape/cdrom driver code.
623: *
624: * If action is ide_end, then the rq is queued at the end of the
625: * request queue, and the function returns immediately without waiting
626: * for the new rq to be completed. This is again intended for careful
627: * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
628: * when operating in the pipelined operation mode).
629: */
630: int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action);
631:
632: /*
633: * Clean up after success/failure of an explicit drive cmd.
634: * stat/err are used only when (HWGROUP(drive)->rq->cmd == IDE_DRIVE_CMD).
635: */
636: void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err);
637:
638: /*
639: * ide_system_bus_speed() returns what we think is the system VESA/PCI
640: * bus speed (in Mhz). This is used for calculating interface PIO timings.
641: * The default is 40 for known PCI systems, 50 otherwise.
642: * The "idebus=xx" parameter can be used to override this value.
643: */
644: int ide_system_bus_speed (void);
645:
646: /*
647: * ide_multwrite() transfers a block of up to mcount sectors of data
648: * to a drive as part of a disk multwrite operation.
649: */
650: void ide_multwrite (ide_drive_t *drive, unsigned int mcount);
651:
652: #ifdef CONFIG_BLK_DEV_IDECD
653: /*
654: * These are routines in ide-cd.c invoked from ide.c
655: */
656: void ide_do_rw_cdrom (ide_drive_t *, unsigned long);
657: int ide_cdrom_ioctl (ide_drive_t *, struct inode *, struct file *, unsigned int, unsigned long);
658: int ide_cdrom_check_media_change (ide_drive_t *);
659: int ide_cdrom_open (struct inode *, struct file *, ide_drive_t *);
660: void ide_cdrom_release (struct inode *, struct file *, ide_drive_t *);
661: void ide_cdrom_setup (ide_drive_t *);
662: #endif /* CONFIG_BLK_DEV_IDECD */
663:
664: #ifdef CONFIG_BLK_DEV_IDETAPE
665:
666: /*
667: * Functions in ide-tape.c which are invoked from ide.c:
668: */
669:
670: /*
671: * idetape_identify_device is called during device probing stage to
672: * probe for an ide atapi tape drive and to initialize global variables
673: * in ide-tape.c which provide the link between the character device
674: * and the corresponding block device.
675: *
676: * Returns 1 if an ide tape was detected and is supported.
677: * Returns 0 otherwise.
678: */
679:
680: int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id);
681:
682: /*
683: * idetape_setup is called a bit later than idetape_identify_device,
684: * during the search for disk partitions, to initialize various tape
685: * state variables in ide_drive_t *drive.
686: */
687:
688: void idetape_setup (ide_drive_t *drive);
689:
690: /*
691: * idetape_do_request is our request function. It is called by ide.c
692: * to process a new request.
693: */
694:
695: void idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block);
696:
697: /*
698: * idetape_end_request is used to finish servicing a request, and to
699: * insert a pending pipeline request into the main device queue.
700: */
701:
702: void idetape_end_request (byte uptodate, ide_hwgroup_t *hwgroup);
703:
704: /*
705: * Block device interface functions.
706: */
707:
708: int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
709: unsigned int cmd, unsigned long arg);
710: int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive);
711: void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive);
712:
713: /*
714: * idetape_register_chrdev initializes the character device interface to
715: * the ide tape drive.
716: */
717:
718: void idetape_register_chrdev (void);
719:
720: #endif /* CONFIG_BLK_DEV_IDETAPE */
721:
722: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
723: int idefloppy_identify_device (ide_drive_t *drive,struct hd_driveid *id);
724: void idefloppy_setup (ide_drive_t *drive);
725: void idefloppy_do_request (ide_drive_t *drive, struct request *rq, unsigned long block);
726: void idefloppy_end_request (byte uptodate, ide_hwgroup_t *hwgroup);
727: int idefloppy_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
728: unsigned int cmd, unsigned long arg);
729: int idefloppy_open (struct inode *inode, struct file *filp, ide_drive_t *drive);
730: void idefloppy_release (struct inode *inode, struct file *filp, ide_drive_t *drive);
731: int idefloppy_media_change (ide_drive_t *drive);
732: unsigned long idefloppy_capacity (ide_drive_t *drive);
733: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
734:
735: #ifdef CONFIG_BLK_DEV_IDESCSI
736: void idescsi_setup (ide_drive_t *drive);
737: void idescsi_do_request (ide_drive_t *drive, struct request *rq, unsigned long block);
738: void idescsi_end_request (byte uptodate, ide_hwgroup_t *hwgroup);
739: int idescsi_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
740: int idescsi_open (struct inode *inode, struct file *filp, ide_drive_t *drive);
741: void idescsi_ide_release (struct inode *inode, struct file *filp, ide_drive_t *drive);
742: #endif /* CONFIG_BLK_DEV_IDESCSI */
743:
744: #ifdef CONFIG_BLK_DEV_TRITON
745: void ide_init_triton (byte, byte);
746: void ide_init_promise (byte bus, byte fn, ide_hwif_t *hwif0, ide_hwif_t *hwif1, unsigned short dma);
747: #endif /* CONFIG_BLK_DEV_TRITON */
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