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[libata] change ata_qc_complete() to take error mask as second arg
[linux-2.6/kvm.git] / include / linux / libata.h
blob0ba3af7a1236f448ac886878398da323d559309b
1 /*
2 * Copyright 2003-2005 Red Hat, Inc. All rights reserved.
3 * Copyright 2003-2005 Jeff Garzik
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2, or (at your option)
9 * any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; see the file COPYING. If not, write to
18 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
19 *
20 *
21 * libata documentation is available via 'make {ps|pdf}docs',
22 * as Documentation/DocBook/libata.*
23 *
24 */
25
26 #ifndef __LINUX_LIBATA_H__
27 #define __LINUX_LIBATA_H__
28
29 #include <linux/delay.h>
30 #include <linux/interrupt.h>
31 #include <linux/pci.h>
32 #include <asm/io.h>
33 #include <linux/ata.h>
34 #include <linux/workqueue.h>
35
36 /*
37 * compile-time options
38 */
39 #undef ATA_DEBUG /* debugging output */
40 #undef ATA_VERBOSE_DEBUG /* yet more debugging output */
41 #undef ATA_IRQ_TRAP /* define to ack screaming irqs */
42 #undef ATA_NDEBUG /* define to disable quick runtime checks */
43 #undef ATA_ENABLE_PATA /* define to enable PATA support in some
44 * low-level drivers */
45 #undef ATAPI_ENABLE_DMADIR /* enables ATAPI DMADIR bridge support */
46
47
48 /* note: prints function name for you */
49 #ifdef ATA_DEBUG
50 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
51 #ifdef ATA_VERBOSE_DEBUG
52 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
53 #else
54 #define VPRINTK(fmt, args...)
55 #endif /* ATA_VERBOSE_DEBUG */
56 #else
57 #define DPRINTK(fmt, args...)
58 #define VPRINTK(fmt, args...)
59 #endif /* ATA_DEBUG */
60
61 #ifdef ATA_NDEBUG
62 #define assert(expr)
63 #else
64 #define assert(expr) \
65 if(unlikely(!(expr))) { \
66 printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
67 #expr,__FILE__,__FUNCTION__,__LINE__); \
68 }
69 #endif
70
71 /* defines only for the constants which don't work well as enums */
72 #define ATA_TAG_POISON 0xfafbfcfdU
73
74 /* move to PCI layer? */
75 static inline struct device *pci_dev_to_dev(struct pci_dev *pdev)
76 {
77 return &pdev->dev;
78 }
79
80 enum {
81 /* various global constants */
82 LIBATA_MAX_PRD = ATA_MAX_PRD / 2,
83 ATA_MAX_PORTS = 8,
84 ATA_DEF_QUEUE = 1,
85 ATA_MAX_QUEUE = 1,
86 ATA_MAX_SECTORS = 200, /* FIXME */
87 ATA_MAX_BUS = 2,
88 ATA_DEF_BUSY_WAIT = 10000,
89 ATA_SHORT_PAUSE = (HZ >> 6) + 1,
90
91 ATA_SHT_EMULATED = 1,
92 ATA_SHT_CMD_PER_LUN = 1,
93 ATA_SHT_THIS_ID = -1,
94 ATA_SHT_USE_CLUSTERING = 1,
95
96 /* struct ata_device stuff */
97 ATA_DFLAG_LBA48 = (1 << 0), /* device supports LBA48 */
98 ATA_DFLAG_PIO = (1 << 1), /* device currently in PIO mode */
99 ATA_DFLAG_LOCK_SECTORS = (1 << 2), /* don't adjust max_sectors */
100 ATA_DFLAG_LBA = (1 << 3), /* device supports LBA */
101
102 ATA_DEV_UNKNOWN = 0, /* unknown device */
103 ATA_DEV_ATA = 1, /* ATA device */
104 ATA_DEV_ATA_UNSUP = 2, /* ATA device (unsupported) */
105 ATA_DEV_ATAPI = 3, /* ATAPI device */
106 ATA_DEV_ATAPI_UNSUP = 4, /* ATAPI device (unsupported) */
107 ATA_DEV_NONE = 5, /* no device */
108
109 /* struct ata_port flags */
110 ATA_FLAG_SLAVE_POSS = (1 << 1), /* host supports slave dev */
111 /* (doesn't imply presence) */
112 ATA_FLAG_PORT_DISABLED = (1 << 2), /* port is disabled, ignore it */
113 ATA_FLAG_SATA = (1 << 3),
114 ATA_FLAG_NO_LEGACY = (1 << 4), /* no legacy mode check */
115 ATA_FLAG_SRST = (1 << 5), /* use ATA SRST, not E.D.D. */
116 ATA_FLAG_MMIO = (1 << 6), /* use MMIO, not PIO */
117 ATA_FLAG_SATA_RESET = (1 << 7), /* use COMRESET */
118 ATA_FLAG_PIO_DMA = (1 << 8), /* PIO cmds via DMA */
119 ATA_FLAG_NOINTR = (1 << 9), /* FIXME: Remove this once
120 * proper HSM is in place. */
121
122 ATA_QCFLAG_ACTIVE = (1 << 1), /* cmd not yet ack'd to scsi lyer */
123 ATA_QCFLAG_SG = (1 << 3), /* have s/g table? */
124 ATA_QCFLAG_SINGLE = (1 << 4), /* no s/g, just a single buffer */
125 ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
126
127 /* various lengths of time */
128 ATA_TMOUT_EDD = 5 * HZ, /* hueristic */
129 ATA_TMOUT_PIO = 30 * HZ,
130 ATA_TMOUT_BOOT = 30 * HZ, /* hueristic */
131 ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* hueristic */
132 ATA_TMOUT_CDB = 30 * HZ,
133 ATA_TMOUT_CDB_QUICK = 5 * HZ,
134
135 /* ATA bus states */
136 BUS_UNKNOWN = 0,
137 BUS_DMA = 1,
138 BUS_IDLE = 2,
139 BUS_NOINTR = 3,
140 BUS_NODATA = 4,
141 BUS_TIMER = 5,
142 BUS_PIO = 6,
143 BUS_EDD = 7,
144 BUS_IDENTIFY = 8,
145 BUS_PACKET = 9,
146
147 /* SATA port states */
148 PORT_UNKNOWN = 0,
149 PORT_ENABLED = 1,
150 PORT_DISABLED = 2,
151
152 /* encoding various smaller bitmaps into a single
153 * unsigned long bitmap
154 */
155 ATA_SHIFT_UDMA = 0,
156 ATA_SHIFT_MWDMA = 8,
157 ATA_SHIFT_PIO = 11,
158
159 /* Masks for port functions */
160 ATA_PORT_PRIMARY = (1 << 0),
161 ATA_PORT_SECONDARY = (1 << 1),
162 };
163
164 enum hsm_task_states {
165 HSM_ST_UNKNOWN,
166 HSM_ST_IDLE,
167 HSM_ST_POLL,
168 HSM_ST_TMOUT,
169 HSM_ST,
170 HSM_ST_LAST,
171 HSM_ST_LAST_POLL,
172 HSM_ST_ERR,
173 };
174
175 enum ata_completion_errors {
176 AC_ERR_OTHER = (1 << 0),
177 AC_ERR_DEV = (1 << 1),
178 AC_ERR_ATA_BUS = (1 << 2),
179 AC_ERR_HOST_BUS = (1 << 3),
180 };
181
182 /* forward declarations */
183 struct scsi_device;
184 struct ata_port_operations;
185 struct ata_port;
186 struct ata_queued_cmd;
187
188 /* typedefs */
189 typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc, unsigned int err_mask);
190
191 struct ata_ioports {
192 unsigned long cmd_addr;
193 unsigned long data_addr;
194 unsigned long error_addr;
195 unsigned long feature_addr;
196 unsigned long nsect_addr;
197 unsigned long lbal_addr;
198 unsigned long lbam_addr;
199 unsigned long lbah_addr;
200 unsigned long device_addr;
201 unsigned long status_addr;
202 unsigned long command_addr;
203 unsigned long altstatus_addr;
204 unsigned long ctl_addr;
205 unsigned long bmdma_addr;
206 unsigned long scr_addr;
207 };
208
209 struct ata_probe_ent {
210 struct list_head node;
211 struct device *dev;
212 const struct ata_port_operations *port_ops;
213 Scsi_Host_Template *sht;
214 struct ata_ioports port[ATA_MAX_PORTS];
215 unsigned int n_ports;
216 unsigned int hard_port_no;
217 unsigned int pio_mask;
218 unsigned int mwdma_mask;
219 unsigned int udma_mask;
220 unsigned int legacy_mode;
221 unsigned long irq;
222 unsigned int irq_flags;
223 unsigned long host_flags;
224 void __iomem *mmio_base;
225 void *private_data;
226 };
227
228 struct ata_host_set {
229 spinlock_t lock;
230 struct device *dev;
231 unsigned long irq;
232 void __iomem *mmio_base;
233 unsigned int n_ports;
234 void *private_data;
235 const struct ata_port_operations *ops;
236 struct ata_port * ports[0];
237 };
238
239 struct ata_queued_cmd {
240 struct ata_port *ap;
241 struct ata_device *dev;
242
243 struct scsi_cmnd *scsicmd;
244 void (*scsidone)(struct scsi_cmnd *);
245
246 struct ata_taskfile tf;
247 u8 cdb[ATAPI_CDB_LEN];
248
249 unsigned long flags; /* ATA_QCFLAG_xxx */
250 unsigned int tag;
251 unsigned int n_elem;
252
253 int dma_dir;
254
255 unsigned int nsect;
256 unsigned int cursect;
257
258 unsigned int nbytes;
259 unsigned int curbytes;
260
261 unsigned int cursg;
262 unsigned int cursg_ofs;
263
264 struct scatterlist sgent;
265 void *buf_virt;
266
267 struct scatterlist *sg;
268
269 ata_qc_cb_t complete_fn;
270
271 struct completion *waiting;
272
273 void *private_data;
274 };
275
276 struct ata_host_stats {
277 unsigned long unhandled_irq;
278 unsigned long idle_irq;
279 unsigned long rw_reqbuf;
280 };
281
282 struct ata_device {
283 u64 n_sectors; /* size of device, if ATA */
284 unsigned long flags; /* ATA_DFLAG_xxx */
285 unsigned int class; /* ATA_DEV_xxx */
286 unsigned int devno; /* 0 or 1 */
287 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
288 u8 pio_mode;
289 u8 dma_mode;
290 u8 xfer_mode;
291 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
292
293 unsigned int multi_count; /* sectors count for
294 READ/WRITE MULTIPLE */
295
296 /* for CHS addressing */
297 u16 cylinders; /* Number of cylinders */
298 u16 heads; /* Number of heads */
299 u16 sectors; /* Number of sectors per track */
300 };
301
302 struct ata_port {
303 struct Scsi_Host *host; /* our co-allocated scsi host */
304 const struct ata_port_operations *ops;
305 unsigned long flags; /* ATA_FLAG_xxx */
306 unsigned int id; /* unique id req'd by scsi midlyr */
307 unsigned int port_no; /* unique port #; from zero */
308 unsigned int hard_port_no; /* hardware port #; from zero */
309
310 struct ata_prd *prd; /* our SG list */
311 dma_addr_t prd_dma; /* and its DMA mapping */
312
313 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
314
315 u8 ctl; /* cache of ATA control register */
316 u8 last_ctl; /* Cache last written value */
317 unsigned int bus_state;
318 unsigned int port_state;
319 unsigned int pio_mask;
320 unsigned int mwdma_mask;
321 unsigned int udma_mask;
322 unsigned int cbl; /* cable type; ATA_CBL_xxx */
323 unsigned int cdb_len;
324
325 struct ata_device device[ATA_MAX_DEVICES];
326
327 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
328 unsigned long qactive;
329 unsigned int active_tag;
330
331 struct ata_host_stats stats;
332 struct ata_host_set *host_set;
333
334 struct work_struct packet_task;
335
336 struct work_struct pio_task;
337 unsigned int hsm_task_state;
338 unsigned long pio_task_timeout;
339
340 void *private_data;
341 };
342
343 struct ata_port_operations {
344 void (*port_disable) (struct ata_port *);
345
346 void (*dev_config) (struct ata_port *, struct ata_device *);
347
348 void (*set_piomode) (struct ata_port *, struct ata_device *);
349 void (*set_dmamode) (struct ata_port *, struct ata_device *);
350
351 void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
352 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
353
354 void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
355 u8 (*check_status)(struct ata_port *ap);
356 u8 (*check_altstatus)(struct ata_port *ap);
357 void (*dev_select)(struct ata_port *ap, unsigned int device);
358
359 void (*phy_reset) (struct ata_port *ap);
360 void (*post_set_mode) (struct ata_port *ap);
361
362 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
363
364 void (*bmdma_setup) (struct ata_queued_cmd *qc);
365 void (*bmdma_start) (struct ata_queued_cmd *qc);
366
367 void (*qc_prep) (struct ata_queued_cmd *qc);
368 int (*qc_issue) (struct ata_queued_cmd *qc);
369
370 void (*eng_timeout) (struct ata_port *ap);
371
372 irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
373 void (*irq_clear) (struct ata_port *);
374
375 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
376 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
377 u32 val);
378
379 int (*port_start) (struct ata_port *ap);
380 void (*port_stop) (struct ata_port *ap);
381
382 void (*host_stop) (struct ata_host_set *host_set);
383
384 void (*bmdma_stop) (struct ata_queued_cmd *qc);
385 u8 (*bmdma_status) (struct ata_port *ap);
386 };
387
388 struct ata_port_info {
389 Scsi_Host_Template *sht;
390 unsigned long host_flags;
391 unsigned long pio_mask;
392 unsigned long mwdma_mask;
393 unsigned long udma_mask;
394 const struct ata_port_operations *port_ops;
395 };
396
397 struct ata_timing {
398 unsigned short mode; /* ATA mode */
399 unsigned short setup; /* t1 */
400 unsigned short act8b; /* t2 for 8-bit I/O */
401 unsigned short rec8b; /* t2i for 8-bit I/O */
402 unsigned short cyc8b; /* t0 for 8-bit I/O */
403 unsigned short active; /* t2 or tD */
404 unsigned short recover; /* t2i or tK */
405 unsigned short cycle; /* t0 */
406 unsigned short udma; /* t2CYCTYP/2 */
407 };
408
409 #define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
410
411 extern void ata_port_probe(struct ata_port *);
412 extern void __sata_phy_reset(struct ata_port *ap);
413 extern void sata_phy_reset(struct ata_port *ap);
414 extern void ata_bus_reset(struct ata_port *ap);
415 extern void ata_port_disable(struct ata_port *);
416 extern void ata_std_ports(struct ata_ioports *ioaddr);
417 #ifdef CONFIG_PCI
418 extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
419 unsigned int n_ports);
420 extern void ata_pci_remove_one (struct pci_dev *pdev);
421 #endif /* CONFIG_PCI */
422 extern int ata_device_add(const struct ata_probe_ent *ent);
423 extern void ata_host_set_remove(struct ata_host_set *host_set);
424 extern int ata_scsi_detect(Scsi_Host_Template *sht);
425 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
426 extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
427 extern int ata_scsi_error(struct Scsi_Host *host);
428 extern int ata_scsi_release(struct Scsi_Host *host);
429 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
430 extern int ata_ratelimit(void);
431
432 /*
433 * Default driver ops implementations
434 */
435 extern void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
436 extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
437 extern void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp);
438 extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
439 extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
440 extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
441 extern u8 ata_check_status(struct ata_port *ap);
442 extern u8 ata_altstatus(struct ata_port *ap);
443 extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf);
444 extern int ata_port_start (struct ata_port *ap);
445 extern void ata_port_stop (struct ata_port *ap);
446 extern void ata_host_stop (struct ata_host_set *host_set);
447 extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
448 extern void ata_qc_prep(struct ata_queued_cmd *qc);
449 extern int ata_qc_issue_prot(struct ata_queued_cmd *qc);
450 extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
451 unsigned int buflen);
452 extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
453 unsigned int n_elem);
454 extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
455 extern void ata_dev_id_string(const u16 *id, unsigned char *s,
456 unsigned int ofs, unsigned int len);
457 extern void ata_dev_config(struct ata_port *ap, unsigned int i);
458 extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
459 extern void ata_bmdma_start (struct ata_queued_cmd *qc);
460 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
461 extern u8 ata_bmdma_status(struct ata_port *ap);
462 extern void ata_bmdma_irq_clear(struct ata_port *ap);
463 extern void ata_qc_complete(struct ata_queued_cmd *qc, unsigned int err_mask);
464 extern void ata_eng_timeout(struct ata_port *ap);
465 extern void ata_scsi_simulate(u16 *id, struct scsi_cmnd *cmd,
466 void (*done)(struct scsi_cmnd *));
467 extern int ata_std_bios_param(struct scsi_device *sdev,
468 struct block_device *bdev,
469 sector_t capacity, int geom[]);
470 extern int ata_scsi_slave_config(struct scsi_device *sdev);
471
472 /*
473 * Timing helpers
474 */
475 extern int ata_timing_compute(struct ata_device *, unsigned short,
476 struct ata_timing *, int, int);
477 extern void ata_timing_merge(const struct ata_timing *,
478 const struct ata_timing *, struct ata_timing *,
479 unsigned int);
480
481 enum {
482 ATA_TIMING_SETUP = (1 << 0),
483 ATA_TIMING_ACT8B = (1 << 1),
484 ATA_TIMING_REC8B = (1 << 2),
485 ATA_TIMING_CYC8B = (1 << 3),
486 ATA_TIMING_8BIT = ATA_TIMING_ACT8B | ATA_TIMING_REC8B |
487 ATA_TIMING_CYC8B,
488 ATA_TIMING_ACTIVE = (1 << 4),
489 ATA_TIMING_RECOVER = (1 << 5),
490 ATA_TIMING_CYCLE = (1 << 6),
491 ATA_TIMING_UDMA = (1 << 7),
492 ATA_TIMING_ALL = ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
493 ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
494 ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
495 ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
496 };
497
498
499 #ifdef CONFIG_PCI
500 struct pci_bits {
501 unsigned int reg; /* PCI config register to read */
502 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
503 unsigned long mask;
504 unsigned long val;
505 };
506
507 extern void ata_pci_host_stop (struct ata_host_set *host_set);
508 extern struct ata_probe_ent *
509 ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int portmask);
510 extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);
511
512 #endif /* CONFIG_PCI */
513
514
515 static inline unsigned int ata_tag_valid(unsigned int tag)
516 {
517 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
518 }
519
520 static inline unsigned int ata_dev_present(const struct ata_device *dev)
521 {
522 return ((dev->class == ATA_DEV_ATA) ||
523 (dev->class == ATA_DEV_ATAPI));
524 }
525
526 static inline u8 ata_chk_status(struct ata_port *ap)
527 {
528 return ap->ops->check_status(ap);
529 }
530
531
532 /**
533 * ata_pause - Flush writes and pause 400 nanoseconds.
534 * @ap: Port to wait for.
535 *
536 * LOCKING:
537 * Inherited from caller.
538 */
539
540 static inline void ata_pause(struct ata_port *ap)
541 {
542 ata_altstatus(ap);
543 ndelay(400);
544 }
545
546
547 /**
548 * ata_busy_wait - Wait for a port status register
549 * @ap: Port to wait for.
550 *
551 * Waits up to max*10 microseconds for the selected bits in the port's
552 * status register to be cleared.
553 * Returns final value of status register.
554 *
555 * LOCKING:
556 * Inherited from caller.
557 */
558
559 static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
560 unsigned int max)
561 {
562 u8 status;
563
564 do {
565 udelay(10);
566 status = ata_chk_status(ap);
567 max--;
568 } while ((status & bits) && (max > 0));
569
570 return status;
571 }
572
573
574 /**
575 * ata_wait_idle - Wait for a port to be idle.
576 * @ap: Port to wait for.
577 *
578 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
579 * Returns final value of status register.
580 *
581 * LOCKING:
582 * Inherited from caller.
583 */
584
585 static inline u8 ata_wait_idle(struct ata_port *ap)
586 {
587 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
588
589 if (status & (ATA_BUSY | ATA_DRQ)) {
590 unsigned long l = ap->ioaddr.status_addr;
591 printk(KERN_WARNING
592 "ATA: abnormal status 0x%X on port 0x%lX\n",
593 status, l);
594 }
595
596 return status;
597 }
598
599 static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
600 {
601 qc->tf.ctl |= ATA_NIEN;
602 }
603
604 static inline struct ata_queued_cmd *ata_qc_from_tag (struct ata_port *ap,
605 unsigned int tag)
606 {
607 if (likely(ata_tag_valid(tag)))
608 return &ap->qcmd[tag];
609 return NULL;
610 }
611
612 static inline void ata_tf_init(struct ata_port *ap, struct ata_taskfile *tf, unsigned int device)
613 {
614 memset(tf, 0, sizeof(*tf));
615
616 tf->ctl = ap->ctl;
617 if (device == 0)
618 tf->device = ATA_DEVICE_OBS;
619 else
620 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
621 }
622
623
624 /**
625 * ata_irq_on - Enable interrupts on a port.
626 * @ap: Port on which interrupts are enabled.
627 *
628 * Enable interrupts on a legacy IDE device using MMIO or PIO,
629 * wait for idle, clear any pending interrupts.
630 *
631 * LOCKING:
632 * Inherited from caller.
633 */
634
635 static inline u8 ata_irq_on(struct ata_port *ap)
636 {
637 struct ata_ioports *ioaddr = &ap->ioaddr;
638 u8 tmp;
639
640 ap->ctl &= ~ATA_NIEN;
641 ap->last_ctl = ap->ctl;
642
643 if (ap->flags & ATA_FLAG_MMIO)
644 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
645 else
646 outb(ap->ctl, ioaddr->ctl_addr);
647 tmp = ata_wait_idle(ap);
648
649 ap->ops->irq_clear(ap);
650
651 return tmp;
652 }
653
654
655 /**
656 * ata_irq_ack - Acknowledge a device interrupt.
657 * @ap: Port on which interrupts are enabled.
658 *
659 * Wait up to 10 ms for legacy IDE device to become idle (BUSY
660 * or BUSY+DRQ clear). Obtain dma status and port status from
661 * device. Clear the interrupt. Return port status.
662 *
663 * LOCKING:
664 */
665
666 static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
667 {
668 unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
669 u8 host_stat, post_stat, status;
670
671 status = ata_busy_wait(ap, bits, 1000);
672 if (status & bits)
673 DPRINTK("abnormal status 0x%X\n", status);
674
675 /* get controller status; clear intr, err bits */
676 if (ap->flags & ATA_FLAG_MMIO) {
677 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
678 host_stat = readb(mmio + ATA_DMA_STATUS);
679 writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
680 mmio + ATA_DMA_STATUS);
681
682 post_stat = readb(mmio + ATA_DMA_STATUS);
683 } else {
684 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
685 outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
686 ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
687
688 post_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
689 }
690
691 VPRINTK("irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
692 host_stat, post_stat, status);
693
694 return status;
695 }
696
697 static inline u32 scr_read(struct ata_port *ap, unsigned int reg)
698 {
699 return ap->ops->scr_read(ap, reg);
700 }
701
702 static inline void scr_write(struct ata_port *ap, unsigned int reg, u32 val)
703 {
704 ap->ops->scr_write(ap, reg, val);
705 }
706
707 static inline void scr_write_flush(struct ata_port *ap, unsigned int reg,
708 u32 val)
709 {
710 ap->ops->scr_write(ap, reg, val);
711 (void) ap->ops->scr_read(ap, reg);
712 }
713
714 static inline unsigned int sata_dev_present(struct ata_port *ap)
715 {
716 return ((scr_read(ap, SCR_STATUS) & 0xf) == 0x3) ? 1 : 0;
717 }
718
719 static inline int ata_try_flush_cache(const struct ata_device *dev)
720 {
721 return ata_id_wcache_enabled(dev->id) ||
722 ata_id_has_flush(dev->id) ||
723 ata_id_has_flush_ext(dev->id);
724 }
725
726 static inline unsigned int ac_err_mask(u8 status)
727 {
728 if (status & ATA_BUSY)
729 return AC_ERR_ATA_BUS;
730 if (status & (ATA_ERR | ATA_DF))
731 return AC_ERR_DEV;
732 return 0;
733 }
734
735 static inline unsigned int __ac_err_mask(u8 status)
736 {
737 unsigned int mask = ac_err_mask(status);
738 if (mask == 0)
739 return AC_ERR_OTHER;
740 return mask;
741 }
742
743 #endif /* __LINUX_LIBATA_H__ */
kernel-based virtual machine