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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 DISK_RECOVERY_TIME /* off=0; on=access_delay_time */
29 #define DISK_RECOVERY_TIME 0 /* for hardware that needs it */
30 #endif
31 #ifndef OK_TO_RESET_CONTROLLER /* 1 needed for good error recovery */
32 #define OK_TO_RESET_CONTROLLER 1 /* 0 for use with AH2372A/B interface */
33 #endif
34 #ifndef FAKE_FDISK_FOR_EZDRIVE /* 1 to help linux fdisk with EZDRIVE */
35 #define FAKE_FDISK_FOR_EZDRIVE 1 /* 0 to reduce kernel size */
36 #endif
37 #ifndef SUPPORT_RZ1000 /* 1 to support RZ1000 chipset */
38 #define SUPPORT_RZ1000 1 /* 0 to reduce kernel size */
39 #endif
40 #ifndef SUPPORT_CMD640 /* 1 to support CMD640 chipset */
41 #define SUPPORT_CMD640 1 /* 0 to reduce kernel size */
42 #endif
43 #ifndef SUPPORT_HT6560B /* 1 to support HT6560B chipset */
44 #define SUPPORT_HT6560B 1 /* 0 to reduce kernel size */
45 #endif
46 #ifndef SUPPORT_QD6580 /* 1 to support QD6580 chipset */
47 #define SUPPORT_QD6580 1 /* 0 to reduce kernel size */
48 #endif
49 #ifndef SUPPORT_DTC2278 /* 1 to support DTC2278 chipset */
50 #define SUPPORT_DTC2278 1 /* 0 to reduce kernel size */
51 #ifndef SET_DTC2278_MODE4
52 #define SET_DTC2278_MODE4 0 /* 1 to init primary i/f for PIO mode4 */
53 #endif
54 #endif
55 #ifndef FANCY_STATUS_DUMPS /* 1 for human-readable drive errors */
56 #define FANCY_STATUS_DUMPS 1 /* 0 to reduce kernel size */
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 typedef unsigned char byte; /* used everywhere */
69
70 /*
71 * Probably not wise to fiddle with these
72 */
73 #define ERROR_MAX 8 /* Max read/write errors per sector */
74 #define ERROR_RESET 3 /* Reset controller every 4th retry */
75 #define ERROR_RECAL 1 /* Recalibrate every 2nd retry */
76
77 /*
78 * Ensure that various configuration flags have compatible settings
79 */
80 #ifdef REALLY_SLOW_IO
81 #undef REALLY_FAST_IO
82 #endif
83
84 /*
85 * Definitions for accessing IDE controller registers
86 */
87
88 #define HWIF(drive) ((ide_hwif_t *)drive->hwif)
89 #define HWGROUP(drive) ((ide_hwgroup_t *)(HWIF(drive)->hwgroup))
90
91 #define IDE_DATA_OFFSET (0)
92 #define IDE_ERROR_OFFSET (1)
93 #define IDE_NSECTOR_OFFSET (2)
94 #define IDE_SECTOR_OFFSET (3)
95 #define IDE_LCYL_OFFSET (4)
96 #define IDE_HCYL_OFFSET (5)
97 #define IDE_SELECT_OFFSET (6)
98 #define IDE_STATUS_OFFSET (7)
99 #define IDE_FEATURE_OFFSET IDE_ERROR_OFFSET
100 #define IDE_COMMAND_OFFSET IDE_STATUS_OFFSET
101
102 #define IDE_DATA_REG (HWIF(drive)->io_base+IDE_DATA_OFFSET)
103 #define IDE_ERROR_REG (HWIF(drive)->io_base+IDE_ERROR_OFFSET)
104 #define IDE_NSECTOR_REG (HWIF(drive)->io_base+IDE_NSECTOR_OFFSET)
105 #define IDE_SECTOR_REG (HWIF(drive)->io_base+IDE_SECTOR_OFFSET)
106 #define IDE_LCYL_REG (HWIF(drive)->io_base+IDE_LCYL_OFFSET)
107 #define IDE_HCYL_REG (HWIF(drive)->io_base+IDE_HCYL_OFFSET)
108 #define IDE_SELECT_REG (HWIF(drive)->io_base+IDE_SELECT_OFFSET)
109 #define IDE_STATUS_REG (HWIF(drive)->io_base+IDE_STATUS_OFFSET)
110 #define IDE_CONTROL_REG (HWIF(drive)->ctl_port)
111 #define IDE_FEATURE_REG IDE_ERROR_REG
112 #define IDE_COMMAND_REG IDE_STATUS_REG
113 #define IDE_ALTSTATUS_REG IDE_CONTROL_REG
114
115 #ifdef REALLY_FAST_IO
116 #define OUT_BYTE(b,p) outb((b),p)
117 #define IN_BYTE(p) (byte)inb(p)
118 #else
119 #define OUT_BYTE(b,p) outb_p((b),p)
120 #define IN_BYTE(p) (byte)inb_p(p)
121 #endif /* REALLY_FAST_IO */
122
123 #define GET_ERR() IN_BYTE(IDE_ERROR_REG)
124 #define GET_STAT() IN_BYTE(IDE_STATUS_REG)
125 #define OK_STAT(stat,good,bad) (((stat)&((good)|(bad)))==(good))
126 #define BAD_R_STAT (BUSY_STAT | ERR_STAT)
127 #define BAD_W_STAT (BAD_R_STAT | WRERR_STAT)
128 #define BAD_STAT (BAD_R_STAT | DRQ_STAT)
129 #define DRIVE_READY (READY_STAT | SEEK_STAT)
130 #define DATA_READY (DRIVE_READY | DRQ_STAT)
131
132 /*
133 * Some more useful definitions
134 */
135 #define IDE_MAJOR_NAME "ide" /* the same for all i/f; see also genhd.c */
136 #define MAJOR_NAME IDE_MAJOR_NAME
137 #define PARTN_BITS 6 /* number of minor dev bits for partitions */
138 #define PARTN_MASK ((1<<PARTN_BITS)-1) /* a useful bit mask */
139 #define MAX_DRIVES 2 /* per interface; 2 assumed by lots of code */
140 #define MAX_HWIFS 4 /* an arbitrary, but realistic limit */
141 #define SECTOR_WORDS (512 / 4) /* number of 32bit words per sector */
142
143 /*
144 * Timeouts for various operations:
145 */
146 #define WAIT_DRQ (5*HZ/100) /* 50msec - spec allows up to 20ms */
147 #define WAIT_READY (3*HZ/100) /* 30msec - should be instantaneous */
148 #define WAIT_PIDENTIFY (1*HZ) /* 1sec - should be less than 3ms (?) */
149 #define WAIT_WORSTCASE (30*HZ) /* 30sec - worst case when spinning up */
150 #define WAIT_CMD (10*HZ) /* 10sec - maximum wait for an IRQ to happen */
151
152 #ifdef CONFIG_BLK_DEV_IDECD
153
154 struct atapi_request_sense {
155 unsigned char error_code : 7;
156 unsigned char valid : 1;
157 byte reserved1;
158 unsigned char sense_key : 4;
159 unsigned char reserved2 : 1;
160 unsigned char ili : 1;
161 unsigned char reserved3 : 2;
162 byte info[4];
163 byte sense_len;
164 byte command_info[4];
165 byte asc;
166 byte ascq;
167 byte fru;
168 byte sense_key_specific[3];
169 };
170
171 struct packet_command {
172 char *buffer;
173 int buflen;
174 int stat;
175 struct atapi_request_sense *sense_data;
176 unsigned char c[12];
177 };
178
179 /* Space to hold the disk TOC. */
180
181 #define MAX_TRACKS 99
182 struct atapi_toc_header {
183 unsigned short toc_length;
184 byte first_track;
185 byte last_track;
186 };
187
188 struct atapi_toc_entry {
189 byte reserved1;
190 unsigned control : 4;
191 unsigned adr : 4;
192 byte track;
193 byte reserved2;
194 unsigned lba;
195 };
196
197 struct atapi_toc {
198 int last_session_lba;
199 int xa_flag;
200 unsigned capacity;
201 struct atapi_toc_header hdr;
202 struct atapi_toc_entry ent[MAX_TRACKS+1]; /* One extra for the leadout. */
203 };
204
205 /* Extra per-device info for cdrom drives. */
206 struct cdrom_info {
207
208 /* Buffer for table of contents. NULL if we haven't allocated
209 a TOC buffer for this device yet. */
210
211 struct atapi_toc *toc;
212
213 /* Sector buffer. If a read request wants only the first part of a cdrom
214 block, we cache the rest of the block here, in the expectation that that
215 data is going to be wanted soon. SECTOR_BUFFERED is the number of the
216 first buffered sector, and NSECTORS_BUFFERED is the number of sectors
217 in the buffer. Before the buffer is allocated, we should have
218 SECTOR_BUFFER == NULL and NSECTORS_BUFFERED == 0. */
219
220 unsigned long sector_buffered;
221 unsigned long nsectors_buffered;
222 char *sector_buffer;
223
224 /* The result of the last successful request sense command
225 on this device. */
226 struct atapi_request_sense sense_data;
227 };
228
229 #endif /* CONFIG_BLK_DEV_IDECD */
230
231 /*
232 * Now for the data we need to maintain per-drive: ide_drive_t
233 */
234 typedef enum {disk, cdrom} media_t;
235
236 typedef union {
237 unsigned all : 8; /* all of the bits together */
238 struct {
239 unsigned set_geometry : 1; /* respecify drive geometry */
240 unsigned recalibrate : 1; /* seek to cyl 0 */
241 unsigned set_multmode : 1; /* set multmode count */
242 unsigned reserved : 5; /* unused */
243 } b;
244 } special_t;
245
246 typedef union {
247 unsigned all : 8; /* all of the bits together */
248 struct {
249 unsigned head : 4; /* always zeros here */
250 unsigned unit : 1; /* drive select number, 0 or 1 */
251 unsigned bit5 : 1; /* always 1 */
252 unsigned lba : 1; /* using LBA instead of CHS */
253 unsigned bit7 : 1; /* always 1 */
254 } b;
255 } select_t;
256
257 typedef struct ide_drive_s {
258 special_t special; /* special action flags */
259 #if FAKE_FDISK_FOR_EZDRIVE
260 unsigned ezdrive : 1; /* flag: partitioned with ezdrive */
261 #endif /* FAKE_FDISK_FOR_EZDRIVE */
262 unsigned present : 1; /* drive is physically present */
263 unsigned noprobe : 1; /* from: hdx=noprobe */
264 unsigned keep_settings : 1; /* restore settings after drive reset */
265 unsigned busy : 1; /* currently doing revalidate_disk() */
266 unsigned vlb_32bit : 1; /* use 32bit in/out for data */
267 unsigned vlb_sync : 1; /* needed for some 32bit chip sets */
268 unsigned removeable : 1; /* 1 if need to do check_media_change */
269 unsigned using_dma : 1; /* disk is using dma for read/write */
270 unsigned unmask : 1; /* flag: okay to unmask other irqs */
271 media_t media; /* disk, cdrom, tape */
272 select_t select; /* basic drive/head select reg value */
273 void *hwif; /* actually (ide_hwif_t *) */
274 byte ctl; /* "normal" value for IDE_CONTROL_REG */
275 byte ready_stat; /* min status value for drive ready */
276 byte mult_count; /* current multiple sector setting */
277 byte mult_req; /* requested multiple sector setting */
278 byte chipset; /* interface chipset access method */
279 byte bad_wstat; /* used for ignoring WRERR_STAT */
280 byte sect0; /* offset of first sector for DM6:DDO */
281 byte usage; /* current "open()" count for drive */
282 byte head; /* "real" number of heads */
283 byte sect; /* "real" sectors per track */
284 byte bios_head; /* BIOS/fdisk/LILO number of heads */
285 byte bios_sect; /* BIOS/fdisk/LILO sectors per track */
286 unsigned short bios_cyl; /* BIOS/fdisk/LILO number of cyls */
287 unsigned short cyl; /* "real" number of cyls */
288 struct wait_queue *wqueue; /* used to wait for drive in open() */
289 struct hd_driveid *id; /* drive model identification info */
290 struct hd_struct *part; /* drive partition table */
291 char name[4]; /* drive name, such as "hda" */
292 #ifdef CONFIG_BLK_DEV_IDECD
293 struct cdrom_info cdrom_info; /* from ide-cd.c */
294 #endif /* CONFIG_BLK_DEV_IDECD */
295 } ide_drive_t;
296
297 /*
298 * An ide_dmaproc_t() initiates/aborts DMA read/write operations on a drive.
299 *
300 * The caller is assumed to have selected the drive and programmed the drive's
301 * sector address using CHS or LBA. All that remains is to prepare for DMA
302 * and then issue the actual read/write DMA/PIO command to the drive.
303 *
304 * Returns 0 if all went well.
305 * Returns 1 if DMA read/write could not be started, in which case the caller
306 * should either try again later, or revert to PIO for the current request.
307 */
308 typedef enum {ide_dma_read = 0, ide_dma_write = 1, ide_dma_abort = 2, ide_dma_check = 3} ide_dma_action_t;
309 typedef int (ide_dmaproc_t)(ide_dma_action_t, ide_drive_t *);
310
311 typedef struct hwif_s {
312 struct hwif_s *next; /* for linked-list in ide_hwgroup_t */
313 void *hwgroup; /* actually (ide_hwgroup_t *) */
314 unsigned short io_base; /* base io port addr */
315 unsigned short ctl_port; /* usually io_base+0x206 */
316 ide_drive_t drives[MAX_DRIVES]; /* drive info */
317 struct gendisk *gd; /* gendisk structure */
318 ide_dmaproc_t *dmaproc; /* dma read/write/abort routine */
319 unsigned long *dmatable; /* dma physical region descriptor table */
320 unsigned short dma_base; /* base addr for dma ports (triton) */
321 byte irq; /* our irq number */
322 byte major; /* our major number */
323 byte select; /* pri/sec hwif select for ht6560b */
324 char name[5]; /* name of interface, eg. "ide0" */
325 unsigned noprobe : 1; /* don't probe for this interface */
326 unsigned present : 1; /* this interface exists */
327 #if (DISK_RECOVERY_TIME > 0)
328 unsigned long last_time; /* time when previous rq was done */
329 #endif
330 #ifdef CONFIG_BLK_DEV_IDECD
331 struct request request_sense_request; /* from ide-cd.c */
332 struct packet_command request_sense_pc; /* from ide-cd.c */
333 #endif /* CONFIG_BLK_DEV_IDECD */
334 } ide_hwif_t;
335
336 /*
337 * internal ide interrupt handler type
338 */
339 typedef void (ide_handler_t)(ide_drive_t *);
340
341 typedef struct hwgroup_s {
342 ide_handler_t *handler;/* irq handler, if active */
343 ide_drive_t *drive; /* current drive */
344 ide_hwif_t *hwif; /* ptr to current hwif in linked-list */
345 struct request *rq; /* current request */
346 struct timer_list timer; /* failsafe timer */
347 struct request wrq; /* local copy of current write rq */
348 unsigned long reset_timeout; /* timeout value during ide resets */
349 #ifdef CONFIG_BLK_DEV_IDECD
350 int doing_atapi_reset;
351 #endif /* CONFIG_BLK_DEV_IDECD */
352 } ide_hwgroup_t;
353
354 /*
355 * One final include file, which references some of the data/defns from above
356 */
357 #define IDE_DRIVER /* "parameter" for blk.h */
358 #include <linux/blk.h>
359
360 #if (DISK_RECOVERY_TIME > 0)
361 void ide_set_recovery_timer (ide_hwif_t *);
362 #define SET_RECOVERY_TIMER(drive) ide_set_recovery_timer (drive)
363 #else
364 #define SET_RECOVERY_TIMER(drive)
365 #endif
366
367 /*
368 * The main (re-)entry point for handling a new request is IDE_DO_REQUEST.
369 * Note that IDE_DO_REQUEST should *only* ever be invoked from an interrupt
370 * handler. All others, such as a timer expiry handler, should call
371 * do_hwgroup_request() instead (currently local to ide.c).
372 */
373 void ide_do_request (ide_hwgroup_t *);
374 #define IDE_DO_REQUEST { SET_RECOVERY_TIMER(HWIF(drive)); ide_do_request(HWGROUP(drive)); }
375
376
377 /*
378 * This is used for (nearly) all data transfers from the IDE interface
379 */
380 void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
381
382 /*
383 * This is used for (nearly) all data transfers to the IDE interface
384 */
385 void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
386
387 /*
388 * This is used on exit from the driver, to designate the next irq handler
389 * and also to start the safety timer.
390 */
391 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler);
392
393 /*
394 * Error reporting, in human readable form (luxurious, but a memory hog).
395 */
396 byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat);
397
398 /*
399 * ide_error() takes action based on the error returned by the controller.
400 *
401 * Returns 1 if an ide reset operation has been initiated, in which case
402 * the caller MUST simply return from the driver (through however many levels).
403 * Returns 0 otherwise.
404 */
405 int ide_error (ide_drive_t *drive, const char *msg, byte stat);
406
407 /*
408 * This routine busy-waits for the drive status to be not "busy".
409 * It then checks the status for all of the "good" bits and none
410 * of the "bad" bits, and if all is okay it returns 0. All other
411 * cases return 1 after invoking ide_error()
412 *
413 */
414 int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout);
415
416 /*
417 * This is called from genhd.c to correct DiskManager/EZ-Drive geometries
418 */
419 int ide_xlate_1024(kdev_t, int, const char *);
420
421 /*
422 * Start a reset operation for an IDE interface.
423 * Returns 0 if the reset operation is still in progress,
424 * in which case the drive MUST return, to await completion.
425 * Returns 1 if the reset is complete (success or failure).
426 */
427 int ide_do_reset (ide_drive_t *);
428
429 /*
430 * ide_alloc(): memory allocation for use *only* during driver initialization.
431 * If "within_area" is non-zero, the memory will be allocated such that
432 * it lies entirely within a "within_area" sized area (eg. 4096). This is
433 * needed for DMA stuff. "within_area" must be a power of two (not validated).
434 * All allocations are longword aligned.
435 */
436 void *ide_alloc (unsigned long bytecount, unsigned long within_area);
437
438 /*
439 * This function issues a specific IDE drive command onto the
440 * tail of the request queue, and waits for it to be completed.
441 * If arg is NULL, it goes through all the motions,
442 * but without actually sending a command to the drive.
443 *
444 * The value of arg is passed to the internal handler as rq->buffer.
445 */
446 int ide_do_drive_cmd(kdev_t rdev, char *args);
447
448
449 #ifdef CONFIG_BLK_DEV_IDECD
450 /*
451 * These are routines in ide-cd.c invoked from ide.c
452 */
453 void ide_do_rw_cdrom (ide_drive_t *, unsigned long);
454 int ide_cdrom_ioctl (ide_drive_t *, struct inode *, struct file *, unsigned int, unsigned long);
455 int ide_cdrom_check_media_change (ide_drive_t *);
456 int ide_cdrom_open (struct inode *, struct file *, ide_drive_t *);
457 void ide_cdrom_release (struct inode *, struct file *, ide_drive_t *);
458 void ide_cdrom_setup (ide_drive_t *);
459 #endif /* CONFIG_BLK_DEV_IDECD */
460
461 #ifdef CONFIG_BLK_DEV_TRITON
462 void ide_init_triton (byte, byte);
463 #endif /* CONFIG_BLK_DEV_TRITON */
464
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