2 * Copyright 2003-2005 Red Hat, Inc. All rights reserved.
3 * Copyright 2003-2005 Jeff Garzik
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)
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.
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.
21 * libata documentation is available via 'make {ps|pdf}docs',
22 * as Documentation/DocBook/libata.*
26 #ifndef __LINUX_LIBATA_H__
27 #define __LINUX_LIBATA_H__
29 #include <linux/delay.h>
30 #include <linux/interrupt.h>
31 #include <linux/pci.h>
33 #include <linux/ata.h>
34 #include <linux/workqueue.h>
37 * compile-time options
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 */
48 /* note: prints function name for you */
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)
54 #define VPRINTK(fmt, args...)
55 #endif /* ATA_VERBOSE_DEBUG */
57 #define DPRINTK(fmt, args...)
58 #define VPRINTK(fmt, args...)
59 #endif /* ATA_DEBUG */
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__); \
71 /* defines only for the constants which don't work well as enums */
72 #define ATA_TAG_POISON 0xfafbfcfdU
74 /* move to PCI layer? */
75 static inline struct device
*pci_dev_to_dev(struct pci_dev
*pdev
)
81 /* various global constants */
82 LIBATA_MAX_PRD
= ATA_MAX_PRD
/ 2,
86 ATA_MAX_SECTORS
= 200, /* FIXME */
88 ATA_DEF_BUSY_WAIT
= 10000,
89 ATA_SHORT_PAUSE
= (HZ
>> 6) + 1,
92 ATA_SHT_CMD_PER_LUN
= 1,
94 ATA_SHT_USE_CLUSTERING
= 1,
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 */
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 */
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. */
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
,
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
,
147 /* SATA port states */
152 /* encoding various smaller bitmaps into a single
153 * unsigned long bitmap
159 /* Masks for port functions */
160 ATA_PORT_PRIMARY
= (1 << 0),
161 ATA_PORT_SECONDARY
= (1 << 1),
164 enum hsm_task_states
{
175 /* forward declarations */
177 struct ata_port_operations
;
179 struct ata_queued_cmd
;
182 typedef int (*ata_qc_cb_t
) (struct ata_queued_cmd
*qc
, u8 drv_stat
);
185 unsigned long cmd_addr
;
186 unsigned long data_addr
;
187 unsigned long error_addr
;
188 unsigned long feature_addr
;
189 unsigned long nsect_addr
;
190 unsigned long lbal_addr
;
191 unsigned long lbam_addr
;
192 unsigned long lbah_addr
;
193 unsigned long device_addr
;
194 unsigned long status_addr
;
195 unsigned long command_addr
;
196 unsigned long altstatus_addr
;
197 unsigned long ctl_addr
;
198 unsigned long bmdma_addr
;
199 unsigned long scr_addr
;
202 struct ata_probe_ent
{
203 struct list_head node
;
205 const struct ata_port_operations
*port_ops
;
206 Scsi_Host_Template
*sht
;
207 struct ata_ioports port
[ATA_MAX_PORTS
];
208 unsigned int n_ports
;
209 unsigned int hard_port_no
;
210 unsigned int pio_mask
;
211 unsigned int mwdma_mask
;
212 unsigned int udma_mask
;
213 unsigned int legacy_mode
;
215 unsigned int irq_flags
;
216 unsigned long host_flags
;
217 void __iomem
*mmio_base
;
221 struct ata_host_set
{
225 void __iomem
*mmio_base
;
226 unsigned int n_ports
;
228 const struct ata_port_operations
*ops
;
229 struct ata_port
* ports
[0];
232 struct ata_queued_cmd
{
234 struct ata_device
*dev
;
236 struct scsi_cmnd
*scsicmd
;
237 void (*scsidone
)(struct scsi_cmnd
*);
239 struct ata_taskfile tf
;
240 u8 cdb
[ATAPI_CDB_LEN
];
242 unsigned long flags
; /* ATA_QCFLAG_xxx */
249 unsigned int cursect
;
252 unsigned int curbytes
;
255 unsigned int cursg_ofs
;
257 struct scatterlist sgent
;
260 struct scatterlist
*sg
;
262 ata_qc_cb_t complete_fn
;
264 struct completion
*waiting
;
269 struct ata_host_stats
{
270 unsigned long unhandled_irq
;
271 unsigned long idle_irq
;
272 unsigned long rw_reqbuf
;
276 u64 n_sectors
; /* size of device, if ATA */
277 unsigned long flags
; /* ATA_DFLAG_xxx */
278 unsigned int class; /* ATA_DEV_xxx */
279 unsigned int devno
; /* 0 or 1 */
280 u16 id
[ATA_ID_WORDS
]; /* IDENTIFY xxx DEVICE data */
284 unsigned int xfer_shift
; /* ATA_SHIFT_xxx */
286 unsigned int multi_count
; /* sectors count for
287 READ/WRITE MULTIPLE */
289 /* for CHS addressing */
290 u16 cylinders
; /* Number of cylinders */
291 u16 heads
; /* Number of heads */
292 u16 sectors
; /* Number of sectors per track */
296 struct Scsi_Host
*host
; /* our co-allocated scsi host */
297 const struct ata_port_operations
*ops
;
298 unsigned long flags
; /* ATA_FLAG_xxx */
299 unsigned int id
; /* unique id req'd by scsi midlyr */
300 unsigned int port_no
; /* unique port #; from zero */
301 unsigned int hard_port_no
; /* hardware port #; from zero */
303 struct ata_prd
*prd
; /* our SG list */
304 dma_addr_t prd_dma
; /* and its DMA mapping */
306 struct ata_ioports ioaddr
; /* ATA cmd/ctl/dma register blocks */
308 u8 ctl
; /* cache of ATA control register */
309 u8 last_ctl
; /* Cache last written value */
310 unsigned int bus_state
;
311 unsigned int port_state
;
312 unsigned int pio_mask
;
313 unsigned int mwdma_mask
;
314 unsigned int udma_mask
;
315 unsigned int cbl
; /* cable type; ATA_CBL_xxx */
316 unsigned int cdb_len
;
318 struct ata_device device
[ATA_MAX_DEVICES
];
320 struct ata_queued_cmd qcmd
[ATA_MAX_QUEUE
];
321 unsigned long qactive
;
322 unsigned int active_tag
;
324 struct ata_host_stats stats
;
325 struct ata_host_set
*host_set
;
327 struct work_struct packet_task
;
329 struct work_struct pio_task
;
330 unsigned int hsm_task_state
;
331 unsigned long pio_task_timeout
;
336 struct ata_port_operations
{
337 void (*port_disable
) (struct ata_port
*);
339 void (*dev_config
) (struct ata_port
*, struct ata_device
*);
341 void (*set_piomode
) (struct ata_port
*, struct ata_device
*);
342 void (*set_dmamode
) (struct ata_port
*, struct ata_device
*);
344 void (*tf_load
) (struct ata_port
*ap
, const struct ata_taskfile
*tf
);
345 void (*tf_read
) (struct ata_port
*ap
, struct ata_taskfile
*tf
);
347 void (*exec_command
)(struct ata_port
*ap
, const struct ata_taskfile
*tf
);
348 u8 (*check_status
)(struct ata_port
*ap
);
349 u8 (*check_altstatus
)(struct ata_port
*ap
);
350 void (*dev_select
)(struct ata_port
*ap
, unsigned int device
);
352 void (*phy_reset
) (struct ata_port
*ap
);
353 void (*post_set_mode
) (struct ata_port
*ap
);
355 int (*check_atapi_dma
) (struct ata_queued_cmd
*qc
);
357 void (*bmdma_setup
) (struct ata_queued_cmd
*qc
);
358 void (*bmdma_start
) (struct ata_queued_cmd
*qc
);
360 void (*qc_prep
) (struct ata_queued_cmd
*qc
);
361 int (*qc_issue
) (struct ata_queued_cmd
*qc
);
363 void (*eng_timeout
) (struct ata_port
*ap
);
365 irqreturn_t (*irq_handler
)(int, void *, struct pt_regs
*);
366 void (*irq_clear
) (struct ata_port
*);
368 u32 (*scr_read
) (struct ata_port
*ap
, unsigned int sc_reg
);
369 void (*scr_write
) (struct ata_port
*ap
, unsigned int sc_reg
,
372 int (*port_start
) (struct ata_port
*ap
);
373 void (*port_stop
) (struct ata_port
*ap
);
375 void (*host_stop
) (struct ata_host_set
*host_set
);
377 void (*bmdma_stop
) (struct ata_queued_cmd
*qc
);
378 u8 (*bmdma_status
) (struct ata_port
*ap
);
381 struct ata_port_info
{
382 Scsi_Host_Template
*sht
;
383 unsigned long host_flags
;
384 unsigned long pio_mask
;
385 unsigned long mwdma_mask
;
386 unsigned long udma_mask
;
387 const struct ata_port_operations
*port_ops
;
391 unsigned short mode
; /* ATA mode */
392 unsigned short setup
; /* t1 */
393 unsigned short act8b
; /* t2 for 8-bit I/O */
394 unsigned short rec8b
; /* t2i for 8-bit I/O */
395 unsigned short cyc8b
; /* t0 for 8-bit I/O */
396 unsigned short active
; /* t2 or tD */
397 unsigned short recover
; /* t2i or tK */
398 unsigned short cycle
; /* t0 */
399 unsigned short udma
; /* t2CYCTYP/2 */
402 #define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
404 extern void ata_port_probe(struct ata_port
*);
405 extern void __sata_phy_reset(struct ata_port
*ap
);
406 extern void sata_phy_reset(struct ata_port
*ap
);
407 extern void ata_bus_reset(struct ata_port
*ap
);
408 extern void ata_port_disable(struct ata_port
*);
409 extern void ata_std_ports(struct ata_ioports
*ioaddr
);
411 extern int ata_pci_init_one (struct pci_dev
*pdev
, struct ata_port_info
**port_info
,
412 unsigned int n_ports
);
413 extern void ata_pci_remove_one (struct pci_dev
*pdev
);
414 #endif /* CONFIG_PCI */
415 extern int ata_device_add(const struct ata_probe_ent
*ent
);
416 extern void ata_host_set_remove(struct ata_host_set
*host_set
);
417 extern int ata_scsi_detect(Scsi_Host_Template
*sht
);
418 extern int ata_scsi_ioctl(struct scsi_device
*dev
, int cmd
, void __user
*arg
);
419 extern int ata_scsi_queuecmd(struct scsi_cmnd
*cmd
, void (*done
)(struct scsi_cmnd
*));
420 extern int ata_scsi_error(struct Scsi_Host
*host
);
421 extern int ata_scsi_release(struct Scsi_Host
*host
);
422 extern unsigned int ata_host_intr(struct ata_port
*ap
, struct ata_queued_cmd
*qc
);
423 extern int ata_ratelimit(void);
426 * Default driver ops implementations
428 extern void ata_tf_load(struct ata_port
*ap
, const struct ata_taskfile
*tf
);
429 extern void ata_tf_read(struct ata_port
*ap
, struct ata_taskfile
*tf
);
430 extern void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
);
431 extern void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
);
432 extern void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
);
433 extern void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
);
434 extern u8
ata_check_status(struct ata_port
*ap
);
435 extern u8
ata_altstatus(struct ata_port
*ap
);
436 extern void ata_exec_command(struct ata_port
*ap
, const struct ata_taskfile
*tf
);
437 extern int ata_port_start (struct ata_port
*ap
);
438 extern void ata_port_stop (struct ata_port
*ap
);
439 extern void ata_host_stop (struct ata_host_set
*host_set
);
440 extern irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
);
441 extern void ata_qc_prep(struct ata_queued_cmd
*qc
);
442 extern int ata_qc_issue_prot(struct ata_queued_cmd
*qc
);
443 extern void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
,
444 unsigned int buflen
);
445 extern void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
446 unsigned int n_elem
);
447 extern unsigned int ata_dev_classify(const struct ata_taskfile
*tf
);
448 extern void ata_dev_id_string(const u16
*id
, unsigned char *s
,
449 unsigned int ofs
, unsigned int len
);
450 extern void ata_dev_config(struct ata_port
*ap
, unsigned int i
);
451 extern void ata_bmdma_setup (struct ata_queued_cmd
*qc
);
452 extern void ata_bmdma_start (struct ata_queued_cmd
*qc
);
453 extern void ata_bmdma_stop(struct ata_queued_cmd
*qc
);
454 extern u8
ata_bmdma_status(struct ata_port
*ap
);
455 extern void ata_bmdma_irq_clear(struct ata_port
*ap
);
456 extern void ata_qc_complete(struct ata_queued_cmd
*qc
, u8 drv_stat
);
457 extern void ata_eng_timeout(struct ata_port
*ap
);
458 extern void ata_scsi_simulate(u16
*id
, struct scsi_cmnd
*cmd
,
459 void (*done
)(struct scsi_cmnd
*));
460 extern int ata_std_bios_param(struct scsi_device
*sdev
,
461 struct block_device
*bdev
,
462 sector_t capacity
, int geom
[]);
463 extern int ata_scsi_slave_config(struct scsi_device
*sdev
);
468 extern int ata_timing_compute(struct ata_device
*, unsigned short,
469 struct ata_timing
*, int, int);
470 extern void ata_timing_merge(const struct ata_timing
*,
471 const struct ata_timing
*, struct ata_timing
*,
475 ATA_TIMING_SETUP
= (1 << 0),
476 ATA_TIMING_ACT8B
= (1 << 1),
477 ATA_TIMING_REC8B
= (1 << 2),
478 ATA_TIMING_CYC8B
= (1 << 3),
479 ATA_TIMING_8BIT
= ATA_TIMING_ACT8B
| ATA_TIMING_REC8B
|
481 ATA_TIMING_ACTIVE
= (1 << 4),
482 ATA_TIMING_RECOVER
= (1 << 5),
483 ATA_TIMING_CYCLE
= (1 << 6),
484 ATA_TIMING_UDMA
= (1 << 7),
485 ATA_TIMING_ALL
= ATA_TIMING_SETUP
| ATA_TIMING_ACT8B
|
486 ATA_TIMING_REC8B
| ATA_TIMING_CYC8B
|
487 ATA_TIMING_ACTIVE
| ATA_TIMING_RECOVER
|
488 ATA_TIMING_CYCLE
| ATA_TIMING_UDMA
,
494 unsigned int reg
; /* PCI config register to read */
495 unsigned int width
; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
500 extern void ata_pci_host_stop (struct ata_host_set
*host_set
);
501 extern struct ata_probe_ent
*
502 ata_pci_init_native_mode(struct pci_dev
*pdev
, struct ata_port_info
**port
, int portmask
);
503 extern int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
);
505 #endif /* CONFIG_PCI */
508 static inline unsigned int ata_tag_valid(unsigned int tag
)
510 return (tag
< ATA_MAX_QUEUE
) ? 1 : 0;
513 static inline unsigned int ata_dev_present(const struct ata_device
*dev
)
515 return ((dev
->class == ATA_DEV_ATA
) ||
516 (dev
->class == ATA_DEV_ATAPI
));
519 static inline u8
ata_chk_status(struct ata_port
*ap
)
521 return ap
->ops
->check_status(ap
);
526 * ata_pause - Flush writes and pause 400 nanoseconds.
527 * @ap: Port to wait for.
530 * Inherited from caller.
533 static inline void ata_pause(struct ata_port
*ap
)
541 * ata_busy_wait - Wait for a port status register
542 * @ap: Port to wait for.
544 * Waits up to max*10 microseconds for the selected bits in the port's
545 * status register to be cleared.
546 * Returns final value of status register.
549 * Inherited from caller.
552 static inline u8
ata_busy_wait(struct ata_port
*ap
, unsigned int bits
,
559 status
= ata_chk_status(ap
);
561 } while ((status
& bits
) && (max
> 0));
568 * ata_wait_idle - Wait for a port to be idle.
569 * @ap: Port to wait for.
571 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
572 * Returns final value of status register.
575 * Inherited from caller.
578 static inline u8
ata_wait_idle(struct ata_port
*ap
)
580 u8 status
= ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 1000);
582 if (status
& (ATA_BUSY
| ATA_DRQ
)) {
583 unsigned long l
= ap
->ioaddr
.status_addr
;
585 "ATA: abnormal status 0x%X on port 0x%lX\n",
592 static inline void ata_qc_set_polling(struct ata_queued_cmd
*qc
)
594 qc
->tf
.ctl
|= ATA_NIEN
;
597 static inline struct ata_queued_cmd
*ata_qc_from_tag (struct ata_port
*ap
,
600 if (likely(ata_tag_valid(tag
)))
601 return &ap
->qcmd
[tag
];
605 static inline void ata_tf_init(struct ata_port
*ap
, struct ata_taskfile
*tf
, unsigned int device
)
607 memset(tf
, 0, sizeof(*tf
));
611 tf
->device
= ATA_DEVICE_OBS
;
613 tf
->device
= ATA_DEVICE_OBS
| ATA_DEV1
;
618 * ata_irq_on - Enable interrupts on a port.
619 * @ap: Port on which interrupts are enabled.
621 * Enable interrupts on a legacy IDE device using MMIO or PIO,
622 * wait for idle, clear any pending interrupts.
625 * Inherited from caller.
628 static inline u8
ata_irq_on(struct ata_port
*ap
)
630 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
633 ap
->ctl
&= ~ATA_NIEN
;
634 ap
->last_ctl
= ap
->ctl
;
636 if (ap
->flags
& ATA_FLAG_MMIO
)
637 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
639 outb(ap
->ctl
, ioaddr
->ctl_addr
);
640 tmp
= ata_wait_idle(ap
);
642 ap
->ops
->irq_clear(ap
);
649 * ata_irq_ack - Acknowledge a device interrupt.
650 * @ap: Port on which interrupts are enabled.
652 * Wait up to 10 ms for legacy IDE device to become idle (BUSY
653 * or BUSY+DRQ clear). Obtain dma status and port status from
654 * device. Clear the interrupt. Return port status.
659 static inline u8
ata_irq_ack(struct ata_port
*ap
, unsigned int chk_drq
)
661 unsigned int bits
= chk_drq
? ATA_BUSY
| ATA_DRQ
: ATA_BUSY
;
662 u8 host_stat
, post_stat
, status
;
664 status
= ata_busy_wait(ap
, bits
, 1000);
666 DPRINTK("abnormal status 0x%X\n", status
);
668 /* get controller status; clear intr, err bits */
669 if (ap
->flags
& ATA_FLAG_MMIO
) {
670 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
671 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
672 writeb(host_stat
| ATA_DMA_INTR
| ATA_DMA_ERR
,
673 mmio
+ ATA_DMA_STATUS
);
675 post_stat
= readb(mmio
+ ATA_DMA_STATUS
);
677 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
678 outb(host_stat
| ATA_DMA_INTR
| ATA_DMA_ERR
,
679 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
681 post_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
684 VPRINTK("irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
685 host_stat
, post_stat
, status
);
690 static inline u32
scr_read(struct ata_port
*ap
, unsigned int reg
)
692 return ap
->ops
->scr_read(ap
, reg
);
695 static inline void scr_write(struct ata_port
*ap
, unsigned int reg
, u32 val
)
697 ap
->ops
->scr_write(ap
, reg
, val
);
700 static inline void scr_write_flush(struct ata_port
*ap
, unsigned int reg
,
703 ap
->ops
->scr_write(ap
, reg
, val
);
704 (void) ap
->ops
->scr_read(ap
, reg
);
707 static inline unsigned int sata_dev_present(struct ata_port
*ap
)
709 return ((scr_read(ap
, SCR_STATUS
) & 0xf) == 0x3) ? 1 : 0;
712 static inline int ata_try_flush_cache(const struct ata_device
*dev
)
714 return ata_id_wcache_enabled(dev
->id
) ||
715 ata_id_has_flush(dev
->id
) ||
716 ata_id_has_flush_ext(dev
->id
);
719 #endif /* __LINUX_LIBATA_H__ */
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