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[deliverable/linux.git] / include / linux / libata.h
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 = 0,
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 ATA_DFLAG_CDB_INTR = (1 << 4), /* device asserts INTRQ when ready for CDB */
102
103 ATA_DEV_UNKNOWN = 0, /* unknown device */
104 ATA_DEV_ATA = 1, /* ATA device */
105 ATA_DEV_ATA_UNSUP = 2, /* ATA device (unsupported) */
106 ATA_DEV_ATAPI = 3, /* ATAPI device */
107 ATA_DEV_ATAPI_UNSUP = 4, /* ATAPI device (unsupported) */
108 ATA_DEV_NONE = 5, /* no device */
109
110 /* struct ata_port flags */
111 ATA_FLAG_SLAVE_POSS = (1 << 1), /* host supports slave dev */
112 /* (doesn't imply presence) */
113 ATA_FLAG_PORT_DISABLED = (1 << 2), /* port is disabled, ignore it */
114 ATA_FLAG_SATA = (1 << 3),
115 ATA_FLAG_NO_LEGACY = (1 << 4), /* no legacy mode check */
116 ATA_FLAG_SRST = (1 << 5), /* use ATA SRST, not E.D.D. */
117 ATA_FLAG_MMIO = (1 << 6), /* use MMIO, not PIO */
118 ATA_FLAG_SATA_RESET = (1 << 7), /* use COMRESET */
119 ATA_FLAG_PIO_DMA = (1 << 8), /* PIO cmds via DMA */
120 ATA_FLAG_PIO_POLLING = (1 << 9), /* use polling PIO if LLD
121 * doesn't handle PIO interrupts */
122
123 ATA_QCFLAG_ACTIVE = (1 << 1), /* cmd not yet ack'd to scsi lyer */
124 ATA_QCFLAG_SG = (1 << 3), /* have s/g table? */
125 ATA_QCFLAG_SINGLE = (1 << 4), /* no s/g, just a single buffer */
126 ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
127
128 /* various lengths of time */
129 ATA_TMOUT_EDD = 5 * HZ, /* hueristic */
130 ATA_TMOUT_PIO = 30 * HZ,
131 ATA_TMOUT_BOOT = 30 * HZ, /* hueristic */
132 ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* hueristic */
133 ATA_TMOUT_DATAOUT = 30 * HZ,
134 ATA_TMOUT_DATAOUT_QUICK = 5 * HZ,
135
136 /* ATA bus states */
137 BUS_UNKNOWN = 0,
138 BUS_DMA = 1,
139 BUS_IDLE = 2,
140 BUS_NOINTR = 3,
141 BUS_NODATA = 4,
142 BUS_TIMER = 5,
143 BUS_PIO = 6,
144 BUS_EDD = 7,
145 BUS_IDENTIFY = 8,
146 BUS_PACKET = 9,
147
148 /* SATA port states */
149 PORT_UNKNOWN = 0,
150 PORT_ENABLED = 1,
151 PORT_DISABLED = 2,
152
153 /* encoding various smaller bitmaps into a single
154 * unsigned long bitmap
155 */
156 ATA_SHIFT_UDMA = 0,
157 ATA_SHIFT_MWDMA = 8,
158 ATA_SHIFT_PIO = 11,
159
160 /* Masks for port functions */
161 ATA_PORT_PRIMARY = (1 << 0),
162 ATA_PORT_SECONDARY = (1 << 1),
163 };
164
165 enum hsm_task_states {
166 HSM_ST_UNKNOWN, /* state unknown */
167 HSM_ST_IDLE, /* no command on going */
168 HSM_ST_POLL, /* same as HSM_ST, waits longer */
169 HSM_ST_TMOUT, /* timeout */
170 HSM_ST, /* (waiting the device to) transfer data */
171 HSM_ST_LAST, /* (waiting the device to) complete command */
172 HSM_ST_LAST_POLL, /* same as HSM_ST_LAST, waits longer */
173 HSM_ST_ERR, /* error */
174 HSM_ST_FIRST, /* (waiting the device to)
175 write CDB or first data block */
176 };
177
178 /* forward declarations */
179 struct scsi_device;
180 struct ata_port_operations;
181 struct ata_port;
182 struct ata_queued_cmd;
183
184 /* typedefs */
185 typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc, u8 drv_stat);
186
187 struct ata_ioports {
188 unsigned long cmd_addr;
189 unsigned long data_addr;
190 unsigned long error_addr;
191 unsigned long feature_addr;
192 unsigned long nsect_addr;
193 unsigned long lbal_addr;
194 unsigned long lbam_addr;
195 unsigned long lbah_addr;
196 unsigned long device_addr;
197 unsigned long status_addr;
198 unsigned long command_addr;
199 unsigned long altstatus_addr;
200 unsigned long ctl_addr;
201 unsigned long bmdma_addr;
202 unsigned long scr_addr;
203 };
204
205 struct ata_probe_ent {
206 struct list_head node;
207 struct device *dev;
208 struct ata_port_operations *port_ops;
209 Scsi_Host_Template *sht;
210 struct ata_ioports port[ATA_MAX_PORTS];
211 unsigned int n_ports;
212 unsigned int hard_port_no;
213 unsigned int pio_mask;
214 unsigned int mwdma_mask;
215 unsigned int udma_mask;
216 unsigned int legacy_mode;
217 unsigned long irq;
218 unsigned int irq_flags;
219 unsigned long host_flags;
220 void __iomem *mmio_base;
221 void *private_data;
222 };
223
224 struct ata_host_set {
225 spinlock_t lock;
226 struct device *dev;
227 unsigned long irq;
228 void __iomem *mmio_base;
229 unsigned int n_ports;
230 void *private_data;
231 struct ata_port_operations *ops;
232 struct ata_port * ports[0];
233 };
234
235 struct ata_queued_cmd {
236 struct ata_port *ap;
237 struct ata_device *dev;
238
239 struct scsi_cmnd *scsicmd;
240 void (*scsidone)(struct scsi_cmnd *);
241
242 struct ata_taskfile tf;
243 u8 cdb[ATAPI_CDB_LEN];
244
245 unsigned long flags; /* ATA_QCFLAG_xxx */
246 unsigned int tag;
247 unsigned int n_elem;
248
249 int dma_dir;
250
251 unsigned int nsect;
252 unsigned int cursect;
253
254 unsigned int nbytes;
255 unsigned int curbytes;
256
257 unsigned int cursg;
258 unsigned int cursg_ofs;
259
260 struct scatterlist sgent;
261 void *buf_virt;
262
263 struct scatterlist *sg;
264
265 ata_qc_cb_t complete_fn;
266
267 struct completion *waiting;
268
269 void *private_data;
270 };
271
272 struct ata_host_stats {
273 unsigned long unhandled_irq;
274 unsigned long idle_irq;
275 unsigned long rw_reqbuf;
276 };
277
278 struct ata_device {
279 u64 n_sectors; /* size of device, if ATA */
280 unsigned long flags; /* ATA_DFLAG_xxx */
281 unsigned int class; /* ATA_DEV_xxx */
282 unsigned int devno; /* 0 or 1 */
283 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
284 u8 pio_mode;
285 u8 dma_mode;
286 u8 xfer_mode;
287 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
288
289 unsigned int multi_count; /* sectors count for
290 READ/WRITE MULTIPLE */
291
292 /* for CHS addressing */
293 u16 cylinders; /* Number of cylinders */
294 u16 heads; /* Number of heads */
295 u16 sectors; /* Number of sectors per track */
296 };
297
298 struct ata_port {
299 struct Scsi_Host *host; /* our co-allocated scsi host */
300 struct ata_port_operations *ops;
301 unsigned long flags; /* ATA_FLAG_xxx */
302 unsigned int id; /* unique id req'd by scsi midlyr */
303 unsigned int port_no; /* unique port #; from zero */
304 unsigned int hard_port_no; /* hardware port #; from zero */
305
306 struct ata_prd *prd; /* our SG list */
307 dma_addr_t prd_dma; /* and its DMA mapping */
308
309 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
310
311 u8 ctl; /* cache of ATA control register */
312 u8 last_ctl; /* Cache last written value */
313 unsigned int bus_state;
314 unsigned int port_state;
315 unsigned int pio_mask;
316 unsigned int mwdma_mask;
317 unsigned int udma_mask;
318 unsigned int cbl; /* cable type; ATA_CBL_xxx */
319 unsigned int cdb_len;
320
321 struct ata_device device[ATA_MAX_DEVICES];
322
323 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
324 unsigned long qactive;
325 unsigned int active_tag;
326
327 struct ata_host_stats stats;
328 struct ata_host_set *host_set;
329
330 struct work_struct dataout_task;
331
332 struct work_struct pio_task;
333 unsigned int hsm_task_state;
334 unsigned long pio_task_timeout;
335
336 void *private_data;
337 };
338
339 struct ata_port_operations {
340 void (*port_disable) (struct ata_port *);
341
342 void (*dev_config) (struct ata_port *, struct ata_device *);
343
344 void (*set_piomode) (struct ata_port *, struct ata_device *);
345 void (*set_dmamode) (struct ata_port *, struct ata_device *);
346
347 void (*tf_load) (struct ata_port *ap, struct ata_taskfile *tf);
348 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
349
350 void (*exec_command)(struct ata_port *ap, struct ata_taskfile *tf);
351 u8 (*check_status)(struct ata_port *ap);
352 u8 (*check_altstatus)(struct ata_port *ap);
353 u8 (*check_err)(struct ata_port *ap);
354 void (*dev_select)(struct ata_port *ap, unsigned int device);
355
356 void (*phy_reset) (struct ata_port *ap);
357 void (*post_set_mode) (struct ata_port *ap);
358
359 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
360
361 void (*bmdma_setup) (struct ata_queued_cmd *qc);
362 void (*bmdma_start) (struct ata_queued_cmd *qc);
363
364 void (*qc_prep) (struct ata_queued_cmd *qc);
365 int (*qc_issue) (struct ata_queued_cmd *qc);
366
367 void (*eng_timeout) (struct ata_port *ap);
368
369 irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
370 void (*irq_clear) (struct ata_port *);
371
372 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
373 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
374 u32 val);
375
376 int (*port_start) (struct ata_port *ap);
377 void (*port_stop) (struct ata_port *ap);
378
379 void (*host_stop) (struct ata_host_set *host_set);
380
381 void (*bmdma_stop) (struct ata_queued_cmd *qc);
382 u8 (*bmdma_status) (struct ata_port *ap);
383 };
384
385 struct ata_port_info {
386 Scsi_Host_Template *sht;
387 unsigned long host_flags;
388 unsigned long pio_mask;
389 unsigned long mwdma_mask;
390 unsigned long udma_mask;
391 struct ata_port_operations *port_ops;
392 };
393
394
395 extern void ata_port_probe(struct ata_port *);
396 extern void __sata_phy_reset(struct ata_port *ap);
397 extern void sata_phy_reset(struct ata_port *ap);
398 extern void ata_bus_reset(struct ata_port *ap);
399 extern void ata_port_disable(struct ata_port *);
400 extern void ata_std_ports(struct ata_ioports *ioaddr);
401 #ifdef CONFIG_PCI
402 extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
403 unsigned int n_ports);
404 extern void ata_pci_remove_one (struct pci_dev *pdev);
405 #endif /* CONFIG_PCI */
406 extern int ata_device_add(struct ata_probe_ent *ent);
407 extern void ata_host_set_remove(struct ata_host_set *host_set);
408 extern int ata_scsi_detect(Scsi_Host_Template *sht);
409 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
410 extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
411 extern int ata_scsi_error(struct Scsi_Host *host);
412 extern int ata_scsi_release(struct Scsi_Host *host);
413 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
414 extern int ata_ratelimit(void);
415
416 /*
417 * Default driver ops implementations
418 */
419 extern void ata_tf_load(struct ata_port *ap, struct ata_taskfile *tf);
420 extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
421 extern void ata_tf_to_fis(struct ata_taskfile *tf, u8 *fis, u8 pmp);
422 extern void ata_tf_from_fis(u8 *fis, struct ata_taskfile *tf);
423 extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
424 extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
425 extern u8 ata_check_status(struct ata_port *ap);
426 extern u8 ata_altstatus(struct ata_port *ap);
427 extern u8 ata_chk_err(struct ata_port *ap);
428 extern void ata_exec_command(struct ata_port *ap, struct ata_taskfile *tf);
429 extern int ata_port_start (struct ata_port *ap);
430 extern void ata_port_stop (struct ata_port *ap);
431 extern void ata_host_stop (struct ata_host_set *host_set);
432 extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
433 extern void ata_qc_prep(struct ata_queued_cmd *qc);
434 extern int ata_qc_issue_prot(struct ata_queued_cmd *qc);
435 extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
436 unsigned int buflen);
437 extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
438 unsigned int n_elem);
439 extern unsigned int ata_dev_classify(struct ata_taskfile *tf);
440 extern void ata_dev_id_string(u16 *id, unsigned char *s,
441 unsigned int ofs, unsigned int len);
442 extern void ata_dev_config(struct ata_port *ap, unsigned int i);
443 extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
444 extern void ata_bmdma_start (struct ata_queued_cmd *qc);
445 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
446 extern u8 ata_bmdma_status(struct ata_port *ap);
447 extern void ata_bmdma_irq_clear(struct ata_port *ap);
448 extern void ata_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat);
449 extern void ata_eng_timeout(struct ata_port *ap);
450 extern void ata_scsi_simulate(u16 *id, struct scsi_cmnd *cmd,
451 void (*done)(struct scsi_cmnd *));
452 extern int ata_std_bios_param(struct scsi_device *sdev,
453 struct block_device *bdev,
454 sector_t capacity, int geom[]);
455 extern int ata_scsi_slave_config(struct scsi_device *sdev);
456
457
458 #ifdef CONFIG_PCI
459 struct pci_bits {
460 unsigned int reg; /* PCI config register to read */
461 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
462 unsigned long mask;
463 unsigned long val;
464 };
465
466 extern void ata_pci_host_stop (struct ata_host_set *host_set);
467 extern struct ata_probe_ent *
468 ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int portmask);
469 extern int pci_test_config_bits(struct pci_dev *pdev, struct pci_bits *bits);
470
471 #endif /* CONFIG_PCI */
472
473
474 static inline unsigned int ata_tag_valid(unsigned int tag)
475 {
476 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
477 }
478
479 static inline unsigned int ata_dev_present(struct ata_device *dev)
480 {
481 return ((dev->class == ATA_DEV_ATA) ||
482 (dev->class == ATA_DEV_ATAPI));
483 }
484
485 static inline u8 ata_chk_status(struct ata_port *ap)
486 {
487 return ap->ops->check_status(ap);
488 }
489
490
491 /**
492 * ata_pause - Flush writes and pause 400 nanoseconds.
493 * @ap: Port to wait for.
494 *
495 * LOCKING:
496 * Inherited from caller.
497 */
498
499 static inline void ata_pause(struct ata_port *ap)
500 {
501 ata_altstatus(ap);
502 ndelay(400);
503 }
504
505
506 /**
507 * ata_busy_wait - Wait for a port status register
508 * @ap: Port to wait for.
509 *
510 * Waits up to max*10 microseconds for the selected bits in the port's
511 * status register to be cleared.
512 * Returns final value of status register.
513 *
514 * LOCKING:
515 * Inherited from caller.
516 */
517
518 static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
519 unsigned int max)
520 {
521 u8 status;
522
523 do {
524 udelay(10);
525 status = ata_chk_status(ap);
526 max--;
527 } while ((status & bits) && (max > 0));
528
529 return status;
530 }
531
532
533 /**
534 * ata_wait_idle - Wait for a port to be idle.
535 * @ap: Port to wait for.
536 *
537 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
538 * Returns final value of status register.
539 *
540 * LOCKING:
541 * Inherited from caller.
542 */
543
544 static inline u8 ata_wait_idle(struct ata_port *ap)
545 {
546 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
547
548 if (status & (ATA_BUSY | ATA_DRQ)) {
549 unsigned long l = ap->ioaddr.status_addr;
550 printk(KERN_WARNING
551 "ATA: abnormal status 0x%X on port 0x%lX\n",
552 status, l);
553 }
554
555 return status;
556 }
557
558 static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
559 {
560 qc->tf.ctl |= ATA_NIEN;
561 }
562
563 static inline struct ata_queued_cmd *ata_qc_from_tag (struct ata_port *ap,
564 unsigned int tag)
565 {
566 if (likely(ata_tag_valid(tag)))
567 return &ap->qcmd[tag];
568 return NULL;
569 }
570
571 static inline void ata_tf_init(struct ata_port *ap, struct ata_taskfile *tf, unsigned int device)
572 {
573 memset(tf, 0, sizeof(*tf));
574
575 tf->ctl = ap->ctl;
576 if (device == 0)
577 tf->device = ATA_DEVICE_OBS;
578 else
579 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
580 }
581
582
583 /**
584 * ata_irq_on - Enable interrupts on a port.
585 * @ap: Port on which interrupts are enabled.
586 *
587 * Enable interrupts on a legacy IDE device using MMIO or PIO,
588 * wait for idle, clear any pending interrupts.
589 *
590 * LOCKING:
591 * Inherited from caller.
592 */
593
594 static inline u8 ata_irq_on(struct ata_port *ap)
595 {
596 struct ata_ioports *ioaddr = &ap->ioaddr;
597 u8 tmp;
598
599 ap->ctl &= ~ATA_NIEN;
600 ap->last_ctl = ap->ctl;
601
602 if (ap->flags & ATA_FLAG_MMIO)
603 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
604 else
605 outb(ap->ctl, ioaddr->ctl_addr);
606 tmp = ata_wait_idle(ap);
607
608 ap->ops->irq_clear(ap);
609
610 return tmp;
611 }
612
613
614 /**
615 * ata_irq_ack - Acknowledge a device interrupt.
616 * @ap: Port on which interrupts are enabled.
617 *
618 * Wait up to 10 ms for legacy IDE device to become idle (BUSY
619 * or BUSY+DRQ clear). Obtain dma status and port status from
620 * device. Clear the interrupt. Return port status.
621 *
622 * LOCKING:
623 */
624
625 static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
626 {
627 unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
628 u8 host_stat, post_stat, status;
629
630 status = ata_busy_wait(ap, bits, 1000);
631 if (status & bits)
632 DPRINTK("abnormal status 0x%X\n", status);
633
634 /* get controller status; clear intr, err bits */
635 if (ap->flags & ATA_FLAG_MMIO) {
636 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
637 host_stat = readb(mmio + ATA_DMA_STATUS);
638 writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
639 mmio + ATA_DMA_STATUS);
640
641 post_stat = readb(mmio + ATA_DMA_STATUS);
642 } else {
643 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
644 outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
645 ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
646
647 post_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
648 }
649
650 VPRINTK("irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
651 host_stat, post_stat, status);
652
653 return status;
654 }
655
656 static inline u32 scr_read(struct ata_port *ap, unsigned int reg)
657 {
658 return ap->ops->scr_read(ap, reg);
659 }
660
661 static inline void scr_write(struct ata_port *ap, unsigned int reg, u32 val)
662 {
663 ap->ops->scr_write(ap, reg, val);
664 }
665
666 static inline void scr_write_flush(struct ata_port *ap, unsigned int reg,
667 u32 val)
668 {
669 ap->ops->scr_write(ap, reg, val);
670 (void) ap->ops->scr_read(ap, reg);
671 }
672
673 static inline unsigned int sata_dev_present(struct ata_port *ap)
674 {
675 return ((scr_read(ap, SCR_STATUS) & 0xf) == 0x3) ? 1 : 0;
676 }
677
678 static inline int ata_try_flush_cache(struct ata_device *dev)
679 {
680 return ata_id_wcache_enabled(dev->id) ||
681 ata_id_has_flush(dev->id) ||
682 ata_id_has_flush_ext(dev->id);
683 }
684
685 #endif /* __LINUX_LIBATA_H__ */
Linux kernel - Deliverables
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