Linux kernel mirror (for testing)
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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? */
75static inline struct device *pci_dev_to_dev(struct pci_dev *pdev)
76{
77 return &pdev->dev;
78}
79
80enum {
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
101 ATA_DEV_UNKNOWN = 0, /* unknown device */
102 ATA_DEV_ATA = 1, /* ATA device */
103 ATA_DEV_ATA_UNSUP = 2, /* ATA device (unsupported) */
104 ATA_DEV_ATAPI = 3, /* ATAPI device */
105 ATA_DEV_ATAPI_UNSUP = 4, /* ATAPI device (unsupported) */
106 ATA_DEV_NONE = 5, /* no device */
107
108 /* struct ata_port flags */
109 ATA_FLAG_SLAVE_POSS = (1 << 1), /* host supports slave dev */
110 /* (doesn't imply presence) */
111 ATA_FLAG_PORT_DISABLED = (1 << 2), /* port is disabled, ignore it */
112 ATA_FLAG_SATA = (1 << 3),
113 ATA_FLAG_NO_LEGACY = (1 << 4), /* no legacy mode check */
114 ATA_FLAG_SRST = (1 << 5), /* use ATA SRST, not E.D.D. */
115 ATA_FLAG_MMIO = (1 << 6), /* use MMIO, not PIO */
116 ATA_FLAG_SATA_RESET = (1 << 7), /* use COMRESET */
117 ATA_FLAG_PIO_DMA = (1 << 8), /* PIO cmds via DMA */
118 ATA_FLAG_NOINTR = (1 << 9), /* FIXME: Remove this once
119 * proper HSM is in place. */
120
121 ATA_QCFLAG_ACTIVE = (1 << 1), /* cmd not yet ack'd to scsi lyer */
122 ATA_QCFLAG_SG = (1 << 3), /* have s/g table? */
123 ATA_QCFLAG_SINGLE = (1 << 4), /* no s/g, just a single buffer */
124 ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
125
126 /* various lengths of time */
127 ATA_TMOUT_EDD = 5 * HZ, /* hueristic */
128 ATA_TMOUT_PIO = 30 * HZ,
129 ATA_TMOUT_BOOT = 30 * HZ, /* hueristic */
130 ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* hueristic */
131 ATA_TMOUT_CDB = 30 * HZ,
132 ATA_TMOUT_CDB_QUICK = 5 * HZ,
133
134 /* ATA bus states */
135 BUS_UNKNOWN = 0,
136 BUS_DMA = 1,
137 BUS_IDLE = 2,
138 BUS_NOINTR = 3,
139 BUS_NODATA = 4,
140 BUS_TIMER = 5,
141 BUS_PIO = 6,
142 BUS_EDD = 7,
143 BUS_IDENTIFY = 8,
144 BUS_PACKET = 9,
145
146 /* SATA port states */
147 PORT_UNKNOWN = 0,
148 PORT_ENABLED = 1,
149 PORT_DISABLED = 2,
150
151 /* encoding various smaller bitmaps into a single
152 * unsigned long bitmap
153 */
154 ATA_SHIFT_UDMA = 0,
155 ATA_SHIFT_MWDMA = 8,
156 ATA_SHIFT_PIO = 11,
157};
158
159enum pio_task_states {
160 PIO_ST_UNKNOWN,
161 PIO_ST_IDLE,
162 PIO_ST_POLL,
163 PIO_ST_TMOUT,
164 PIO_ST,
165 PIO_ST_LAST,
166 PIO_ST_LAST_POLL,
167 PIO_ST_ERR,
168};
169
170/* forward declarations */
171struct scsi_device;
172struct ata_port_operations;
173struct ata_port;
174struct ata_queued_cmd;
175
176/* typedefs */
177typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc, u8 drv_stat);
178
179struct ata_ioports {
180 unsigned long cmd_addr;
181 unsigned long data_addr;
182 unsigned long error_addr;
183 unsigned long feature_addr;
184 unsigned long nsect_addr;
185 unsigned long lbal_addr;
186 unsigned long lbam_addr;
187 unsigned long lbah_addr;
188 unsigned long device_addr;
189 unsigned long status_addr;
190 unsigned long command_addr;
191 unsigned long altstatus_addr;
192 unsigned long ctl_addr;
193 unsigned long bmdma_addr;
194 unsigned long scr_addr;
195};
196
197struct ata_probe_ent {
198 struct list_head node;
199 struct device *dev;
200 struct ata_port_operations *port_ops;
201 Scsi_Host_Template *sht;
202 struct ata_ioports port[ATA_MAX_PORTS];
203 unsigned int n_ports;
204 unsigned int hard_port_no;
205 unsigned int pio_mask;
206 unsigned int mwdma_mask;
207 unsigned int udma_mask;
208 unsigned int legacy_mode;
209 unsigned long irq;
210 unsigned int irq_flags;
211 unsigned long host_flags;
212 void __iomem *mmio_base;
213 void *private_data;
214};
215
216struct ata_host_set {
217 spinlock_t lock;
218 struct device *dev;
219 unsigned long irq;
220 void __iomem *mmio_base;
221 unsigned int n_ports;
222 void *private_data;
223 struct ata_port_operations *ops;
224 struct ata_port * ports[0];
225};
226
227struct ata_queued_cmd {
228 struct ata_port *ap;
229 struct ata_device *dev;
230
231 struct scsi_cmnd *scsicmd;
232 void (*scsidone)(struct scsi_cmnd *);
233
234 struct ata_taskfile tf;
235 u8 cdb[ATAPI_CDB_LEN];
236
237 unsigned long flags; /* ATA_QCFLAG_xxx */
238 unsigned int tag;
239 unsigned int n_elem;
240
241 int dma_dir;
242
243 unsigned int nsect;
244 unsigned int cursect;
245
246 unsigned int nbytes;
247 unsigned int curbytes;
248
249 unsigned int cursg;
250 unsigned int cursg_ofs;
251
252 struct scatterlist sgent;
253 void *buf_virt;
254
255 struct scatterlist *sg;
256
257 ata_qc_cb_t complete_fn;
258
259 struct completion *waiting;
260
261 void *private_data;
262};
263
264struct ata_host_stats {
265 unsigned long unhandled_irq;
266 unsigned long idle_irq;
267 unsigned long rw_reqbuf;
268};
269
270struct ata_device {
271 u64 n_sectors; /* size of device, if ATA */
272 unsigned long flags; /* ATA_DFLAG_xxx */
273 unsigned int class; /* ATA_DEV_xxx */
274 unsigned int devno; /* 0 or 1 */
275 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
276 u8 pio_mode;
277 u8 dma_mode;
278 u8 xfer_mode;
279 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
280
281 /* cache info about current transfer mode */
282 u8 xfer_protocol; /* taskfile xfer protocol */
283 u8 read_cmd; /* opcode to use on read */
284 u8 write_cmd; /* opcode to use on write */
285};
286
287struct ata_port {
288 struct Scsi_Host *host; /* our co-allocated scsi host */
289 struct ata_port_operations *ops;
290 unsigned long flags; /* ATA_FLAG_xxx */
291 unsigned int id; /* unique id req'd by scsi midlyr */
292 unsigned int port_no; /* unique port #; from zero */
293 unsigned int hard_port_no; /* hardware port #; from zero */
294
295 struct ata_prd *prd; /* our SG list */
296 dma_addr_t prd_dma; /* and its DMA mapping */
297
298 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
299
300 u8 ctl; /* cache of ATA control register */
301 u8 last_ctl; /* Cache last written value */
302 unsigned int bus_state;
303 unsigned int port_state;
304 unsigned int pio_mask;
305 unsigned int mwdma_mask;
306 unsigned int udma_mask;
307 unsigned int cbl; /* cable type; ATA_CBL_xxx */
308 unsigned int cdb_len;
309
310 struct ata_device device[ATA_MAX_DEVICES];
311
312 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
313 unsigned long qactive;
314 unsigned int active_tag;
315
316 struct ata_host_stats stats;
317 struct ata_host_set *host_set;
318
319 struct work_struct packet_task;
320
321 struct work_struct pio_task;
322 unsigned int pio_task_state;
323 unsigned long pio_task_timeout;
324
325 void *private_data;
326};
327
328struct ata_port_operations {
329 void (*port_disable) (struct ata_port *);
330
331 void (*dev_config) (struct ata_port *, struct ata_device *);
332
333 void (*set_piomode) (struct ata_port *, struct ata_device *);
334 void (*set_dmamode) (struct ata_port *, struct ata_device *);
335
336 void (*tf_load) (struct ata_port *ap, struct ata_taskfile *tf);
337 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
338
339 void (*exec_command)(struct ata_port *ap, struct ata_taskfile *tf);
340 u8 (*check_status)(struct ata_port *ap);
341 u8 (*check_altstatus)(struct ata_port *ap);
342 u8 (*check_err)(struct ata_port *ap);
343 void (*dev_select)(struct ata_port *ap, unsigned int device);
344
345 void (*phy_reset) (struct ata_port *ap);
346 void (*post_set_mode) (struct ata_port *ap);
347
348 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
349
350 void (*bmdma_setup) (struct ata_queued_cmd *qc);
351 void (*bmdma_start) (struct ata_queued_cmd *qc);
352
353 void (*qc_prep) (struct ata_queued_cmd *qc);
354 int (*qc_issue) (struct ata_queued_cmd *qc);
355
356 void (*eng_timeout) (struct ata_port *ap);
357
358 irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
359 void (*irq_clear) (struct ata_port *);
360
361 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
362 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
363 u32 val);
364
365 int (*port_start) (struct ata_port *ap);
366 void (*port_stop) (struct ata_port *ap);
367
368 void (*host_stop) (struct ata_host_set *host_set);
369
370 void (*bmdma_stop) (struct ata_queued_cmd *qc);
371 u8 (*bmdma_status) (struct ata_port *ap);
372};
373
374struct ata_port_info {
375 Scsi_Host_Template *sht;
376 unsigned long host_flags;
377 unsigned long pio_mask;
378 unsigned long mwdma_mask;
379 unsigned long udma_mask;
380 struct ata_port_operations *port_ops;
381};
382
383
384extern void ata_port_probe(struct ata_port *);
385extern void __sata_phy_reset(struct ata_port *ap);
386extern void sata_phy_reset(struct ata_port *ap);
387extern void ata_bus_reset(struct ata_port *ap);
388extern void ata_port_disable(struct ata_port *);
389extern void ata_std_ports(struct ata_ioports *ioaddr);
390#ifdef CONFIG_PCI
391extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
392 unsigned int n_ports);
393extern void ata_pci_remove_one (struct pci_dev *pdev);
394#endif /* CONFIG_PCI */
395extern int ata_device_add(struct ata_probe_ent *ent);
396extern void ata_host_set_remove(struct ata_host_set *host_set);
397extern int ata_scsi_detect(Scsi_Host_Template *sht);
398extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
399extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
400extern int ata_scsi_error(struct Scsi_Host *host);
401extern int ata_scsi_release(struct Scsi_Host *host);
402extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
403/*
404 * Default driver ops implementations
405 */
406extern void ata_tf_load(struct ata_port *ap, struct ata_taskfile *tf);
407extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
408extern void ata_tf_to_fis(struct ata_taskfile *tf, u8 *fis, u8 pmp);
409extern void ata_tf_from_fis(u8 *fis, struct ata_taskfile *tf);
410extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
411extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
412extern u8 ata_check_status(struct ata_port *ap);
413extern u8 ata_altstatus(struct ata_port *ap);
414extern u8 ata_chk_err(struct ata_port *ap);
415extern void ata_exec_command(struct ata_port *ap, struct ata_taskfile *tf);
416extern int ata_port_start (struct ata_port *ap);
417extern void ata_port_stop (struct ata_port *ap);
418extern void ata_host_stop (struct ata_host_set *host_set);
419extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
420extern void ata_qc_prep(struct ata_queued_cmd *qc);
421extern int ata_qc_issue_prot(struct ata_queued_cmd *qc);
422extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
423 unsigned int buflen);
424extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
425 unsigned int n_elem);
426extern unsigned int ata_dev_classify(struct ata_taskfile *tf);
427extern void ata_dev_id_string(u16 *id, unsigned char *s,
428 unsigned int ofs, unsigned int len);
429extern void ata_dev_config(struct ata_port *ap, unsigned int i);
430extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
431extern void ata_bmdma_start (struct ata_queued_cmd *qc);
432extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
433extern u8 ata_bmdma_status(struct ata_port *ap);
434extern void ata_bmdma_irq_clear(struct ata_port *ap);
435extern void ata_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat);
436extern void ata_eng_timeout(struct ata_port *ap);
437extern void ata_scsi_simulate(u16 *id, struct scsi_cmnd *cmd,
438 void (*done)(struct scsi_cmnd *));
439extern int ata_std_bios_param(struct scsi_device *sdev,
440 struct block_device *bdev,
441 sector_t capacity, int geom[]);
442extern int ata_scsi_slave_config(struct scsi_device *sdev);
443
444
445#ifdef CONFIG_PCI
446struct pci_bits {
447 unsigned int reg; /* PCI config register to read */
448 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
449 unsigned long mask;
450 unsigned long val;
451};
452
453extern void ata_pci_host_stop (struct ata_host_set *host_set);
454extern struct ata_probe_ent *
455ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port);
456extern int pci_test_config_bits(struct pci_dev *pdev, struct pci_bits *bits);
457
458#endif /* CONFIG_PCI */
459
460
461static inline unsigned int ata_tag_valid(unsigned int tag)
462{
463 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
464}
465
466static inline unsigned int ata_dev_present(struct ata_device *dev)
467{
468 return ((dev->class == ATA_DEV_ATA) ||
469 (dev->class == ATA_DEV_ATAPI));
470}
471
472static inline u8 ata_chk_status(struct ata_port *ap)
473{
474 return ap->ops->check_status(ap);
475}
476
477
478/**
479 * ata_pause - Flush writes and pause 400 nanoseconds.
480 * @ap: Port to wait for.
481 *
482 * LOCKING:
483 * Inherited from caller.
484 */
485
486static inline void ata_pause(struct ata_port *ap)
487{
488 ata_altstatus(ap);
489 ndelay(400);
490}
491
492
493/**
494 * ata_busy_wait - Wait for a port status register
495 * @ap: Port to wait for.
496 *
497 * Waits up to max*10 microseconds for the selected bits in the port's
498 * status register to be cleared.
499 * Returns final value of status register.
500 *
501 * LOCKING:
502 * Inherited from caller.
503 */
504
505static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
506 unsigned int max)
507{
508 u8 status;
509
510 do {
511 udelay(10);
512 status = ata_chk_status(ap);
513 max--;
514 } while ((status & bits) && (max > 0));
515
516 return status;
517}
518
519
520/**
521 * ata_wait_idle - Wait for a port to be idle.
522 * @ap: Port to wait for.
523 *
524 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
525 * Returns final value of status register.
526 *
527 * LOCKING:
528 * Inherited from caller.
529 */
530
531static inline u8 ata_wait_idle(struct ata_port *ap)
532{
533 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
534
535 if (status & (ATA_BUSY | ATA_DRQ)) {
536 unsigned long l = ap->ioaddr.status_addr;
537 printk(KERN_WARNING
538 "ATA: abnormal status 0x%X on port 0x%lX\n",
539 status, l);
540 }
541
542 return status;
543}
544
545static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
546{
547 qc->tf.ctl |= ATA_NIEN;
548}
549
550static inline struct ata_queued_cmd *ata_qc_from_tag (struct ata_port *ap,
551 unsigned int tag)
552{
553 if (likely(ata_tag_valid(tag)))
554 return &ap->qcmd[tag];
555 return NULL;
556}
557
558static inline void ata_tf_init(struct ata_port *ap, struct ata_taskfile *tf, unsigned int device)
559{
560 memset(tf, 0, sizeof(*tf));
561
562 tf->ctl = ap->ctl;
563 if (device == 0)
564 tf->device = ATA_DEVICE_OBS;
565 else
566 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
567}
568
569
570/**
571 * ata_irq_on - Enable interrupts on a port.
572 * @ap: Port on which interrupts are enabled.
573 *
574 * Enable interrupts on a legacy IDE device using MMIO or PIO,
575 * wait for idle, clear any pending interrupts.
576 *
577 * LOCKING:
578 * Inherited from caller.
579 */
580
581static inline u8 ata_irq_on(struct ata_port *ap)
582{
583 struct ata_ioports *ioaddr = &ap->ioaddr;
584 u8 tmp;
585
586 ap->ctl &= ~ATA_NIEN;
587 ap->last_ctl = ap->ctl;
588
589 if (ap->flags & ATA_FLAG_MMIO)
590 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
591 else
592 outb(ap->ctl, ioaddr->ctl_addr);
593 tmp = ata_wait_idle(ap);
594
595 ap->ops->irq_clear(ap);
596
597 return tmp;
598}
599
600
601/**
602 * ata_irq_ack - Acknowledge a device interrupt.
603 * @ap: Port on which interrupts are enabled.
604 *
605 * Wait up to 10 ms for legacy IDE device to become idle (BUSY
606 * or BUSY+DRQ clear). Obtain dma status and port status from
607 * device. Clear the interrupt. Return port status.
608 *
609 * LOCKING:
610 */
611
612static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
613{
614 unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
615 u8 host_stat, post_stat, status;
616
617 status = ata_busy_wait(ap, bits, 1000);
618 if (status & bits)
619 DPRINTK("abnormal status 0x%X\n", status);
620
621 /* get controller status; clear intr, err bits */
622 if (ap->flags & ATA_FLAG_MMIO) {
623 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
624 host_stat = readb(mmio + ATA_DMA_STATUS);
625 writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
626 mmio + ATA_DMA_STATUS);
627
628 post_stat = readb(mmio + ATA_DMA_STATUS);
629 } else {
630 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
631 outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
632 ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
633
634 post_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
635 }
636
637 VPRINTK("irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
638 host_stat, post_stat, status);
639
640 return status;
641}
642
643static inline u32 scr_read(struct ata_port *ap, unsigned int reg)
644{
645 return ap->ops->scr_read(ap, reg);
646}
647
648static inline void scr_write(struct ata_port *ap, unsigned int reg, u32 val)
649{
650 ap->ops->scr_write(ap, reg, val);
651}
652
653static inline void scr_write_flush(struct ata_port *ap, unsigned int reg,
654 u32 val)
655{
656 ap->ops->scr_write(ap, reg, val);
657 (void) ap->ops->scr_read(ap, reg);
658}
659
660static inline unsigned int sata_dev_present(struct ata_port *ap)
661{
662 return ((scr_read(ap, SCR_STATUS) & 0xf) == 0x3) ? 1 : 0;
663}
664
665static inline int ata_try_flush_cache(struct ata_device *dev)
666{
667 return ata_id_wcache_enabled(dev->id) ||
668 ata_id_has_flush(dev->id) ||
669 ata_id_has_flush_ext(dev->id);
670}
671
672#endif /* __LINUX_LIBATA_H__ */