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[PATCH] libata: interrupt driven pio for LLD
[net-next-2.6.git] / include / linux / libata.h
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1da177e4 1/*
af36d7f0
JG		 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 *
1da177e4
LT		 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 */
1da177e4
LT		 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 */
312f7da2 100 ATA_DFLAG_CDB_INTR = (1 << 3), /* device asserts INTRQ when ready for CDB */
1da177e4
LT		 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 */
e50362ec
AL		 119 ATA_FLAG_PIO_POLLING = (1 << 9), /* use polling PIO if LLD
120 * doesn't handle PIO interrupts */
1da177e4
LT		 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
14be71f4
AL		 160enum hsm_task_states {
161 HSM_ST_UNKNOWN,
162 HSM_ST_IDLE,
163 HSM_ST_POLL,
164 HSM_ST_TMOUT,
165 HSM_ST,
166 HSM_ST_LAST,
167 HSM_ST_LAST_POLL,
168 HSM_ST_ERR,
312f7da2 169 HSM_ST_FIRST,
1da177e4
LT		 170};
171
172/* forward declarations */
173struct scsi_device;
174struct ata_port_operations;
175struct ata_port;
176struct ata_queued_cmd;
177
178/* typedefs */
179typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc, u8 drv_stat);
180
181struct ata_ioports {
182 unsigned long cmd_addr;
183 unsigned long data_addr;
184 unsigned long error_addr;
185 unsigned long feature_addr;
186 unsigned long nsect_addr;
187 unsigned long lbal_addr;
188 unsigned long lbam_addr;
189 unsigned long lbah_addr;
190 unsigned long device_addr;
191 unsigned long status_addr;
192 unsigned long command_addr;
193 unsigned long altstatus_addr;
194 unsigned long ctl_addr;
195 unsigned long bmdma_addr;
196 unsigned long scr_addr;
197};
198
199struct ata_probe_ent {
200 struct list_head node;
201 struct device *dev;
202 struct ata_port_operations *port_ops;
203 Scsi_Host_Template *sht;
204 struct ata_ioports port[ATA_MAX_PORTS];
205 unsigned int n_ports;
206 unsigned int hard_port_no;
207 unsigned int pio_mask;
208 unsigned int mwdma_mask;
209 unsigned int udma_mask;
210 unsigned int legacy_mode;
211 unsigned long irq;
212 unsigned int irq_flags;
213 unsigned long host_flags;
214 void __iomem *mmio_base;
215 void *private_data;
216};
217
218struct ata_host_set {
219 spinlock_t lock;
220 struct device *dev;
221 unsigned long irq;
222 void __iomem *mmio_base;
223 unsigned int n_ports;
224 void *private_data;
225 struct ata_port_operations *ops;
226 struct ata_port * ports[0];
227};
228
229struct ata_queued_cmd {
230 struct ata_port *ap;
231 struct ata_device *dev;
232
233 struct scsi_cmnd *scsicmd;
234 void (*scsidone)(struct scsi_cmnd *);
235
236 struct ata_taskfile tf;
237 u8 cdb[ATAPI_CDB_LEN];
238
239 unsigned long flags; /* ATA_QCFLAG_xxx */
240 unsigned int tag;
241 unsigned int n_elem;
242
243 int dma_dir;
244
245 unsigned int nsect;
246 unsigned int cursect;
247
248 unsigned int nbytes;
249 unsigned int curbytes;
250
251 unsigned int cursg;
252 unsigned int cursg_ofs;
253
254 struct scatterlist sgent;
255 void *buf_virt;
256
257 struct scatterlist *sg;
258
259 ata_qc_cb_t complete_fn;
260
261 struct completion *waiting;
262
263 void *private_data;
264};
265
266struct ata_host_stats {
267 unsigned long unhandled_irq;
268 unsigned long idle_irq;
269 unsigned long rw_reqbuf;
270};
271
272struct ata_device {
273 u64 n_sectors; /* size of device, if ATA */
274 unsigned long flags; /* ATA_DFLAG_xxx */
275 unsigned int class; /* ATA_DEV_xxx */
276 unsigned int devno; /* 0 or 1 */
277 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
278 u8 pio_mode;
279 u8 dma_mode;
280 u8 xfer_mode;
281 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
282
283 /* cache info about current transfer mode */
284 u8 xfer_protocol; /* taskfile xfer protocol */
285 u8 read_cmd; /* opcode to use on read */
286 u8 write_cmd; /* opcode to use on write */
287};
288
289struct ata_port {
290 struct Scsi_Host *host; /* our co-allocated scsi host */
291 struct ata_port_operations *ops;
292 unsigned long flags; /* ATA_FLAG_xxx */
293 unsigned int id; /* unique id req'd by scsi midlyr */
294 unsigned int port_no; /* unique port #; from zero */
295 unsigned int hard_port_no; /* hardware port #; from zero */
296
297 struct ata_prd *prd; /* our SG list */
298 dma_addr_t prd_dma; /* and its DMA mapping */
299
300 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
301
302 u8 ctl; /* cache of ATA control register */
303 u8 last_ctl; /* Cache last written value */
304 unsigned int bus_state;
305 unsigned int port_state;
306 unsigned int pio_mask;
307 unsigned int mwdma_mask;
308 unsigned int udma_mask;
309 unsigned int cbl; /* cable type; ATA_CBL_xxx */
310 unsigned int cdb_len;
311
312 struct ata_device device[ATA_MAX_DEVICES];
313
314 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
315 unsigned long qactive;
316 unsigned int active_tag;
317
318 struct ata_host_stats stats;
319 struct ata_host_set *host_set;
320
321 struct work_struct packet_task;
322
323 struct work_struct pio_task;
14be71f4 324 unsigned int hsm_task_state;
1da177e4
LT		 325 unsigned long pio_task_timeout;
326
327 void *private_data;
328};
329
330struct ata_port_operations {
331 void (*port_disable) (struct ata_port *);
332
333 void (*dev_config) (struct ata_port *, struct ata_device *);
334
335 void (*set_piomode) (struct ata_port *, struct ata_device *);
336 void (*set_dmamode) (struct ata_port *, struct ata_device *);
337
338 void (*tf_load) (struct ata_port *ap, struct ata_taskfile *tf);
339 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
340
341 void (*exec_command)(struct ata_port *ap, struct ata_taskfile *tf);
342 u8 (*check_status)(struct ata_port *ap);
343 u8 (*check_altstatus)(struct ata_port *ap);
344 u8 (*check_err)(struct ata_port *ap);
345 void (*dev_select)(struct ata_port *ap, unsigned int device);
346
347 void (*phy_reset) (struct ata_port *ap);
348 void (*post_set_mode) (struct ata_port *ap);
349
350 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
351
352 void (*bmdma_setup) (struct ata_queued_cmd *qc);
353 void (*bmdma_start) (struct ata_queued_cmd *qc);
354
355 void (*qc_prep) (struct ata_queued_cmd *qc);
356 int (*qc_issue) (struct ata_queued_cmd *qc);
357
358 void (*eng_timeout) (struct ata_port *ap);
359
360 irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
361 void (*irq_clear) (struct ata_port *);
362
363 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
364 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
365 u32 val);
366
367 int (*port_start) (struct ata_port *ap);
368 void (*port_stop) (struct ata_port *ap);
369
370 void (*host_stop) (struct ata_host_set *host_set);
371
b73fc89f 372 void (*bmdma_stop) (struct ata_queued_cmd *qc);
1da177e4
LT		 373 u8 (*bmdma_status) (struct ata_port *ap);
374};
375
376struct ata_port_info {
377 Scsi_Host_Template *sht;
378 unsigned long host_flags;
379 unsigned long pio_mask;
380 unsigned long mwdma_mask;
381 unsigned long udma_mask;
382 struct ata_port_operations *port_ops;
383};
384
385
386extern void ata_port_probe(struct ata_port *);
387extern void __sata_phy_reset(struct ata_port *ap);
388extern void sata_phy_reset(struct ata_port *ap);
389extern void ata_bus_reset(struct ata_port *ap);
390extern void ata_port_disable(struct ata_port *);
391extern void ata_std_ports(struct ata_ioports *ioaddr);
392#ifdef CONFIG_PCI
393extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
394 unsigned int n_ports);
395extern void ata_pci_remove_one (struct pci_dev *pdev);
396#endif /* CONFIG_PCI */
397extern int ata_device_add(struct ata_probe_ent *ent);
17b14451 398extern void ata_host_set_remove(struct ata_host_set *host_set);
1da177e4
LT		 399extern int ata_scsi_detect(Scsi_Host_Template *sht);
400extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
401extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
402extern int ata_scsi_error(struct Scsi_Host *host);
403extern int ata_scsi_release(struct Scsi_Host *host);
404extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
405/*
406 * Default driver ops implementations
407 */
408extern void ata_tf_load(struct ata_port *ap, struct ata_taskfile *tf);
409extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
410extern void ata_tf_to_fis(struct ata_taskfile *tf, u8 *fis, u8 pmp);
411extern void ata_tf_from_fis(u8 *fis, struct ata_taskfile *tf);
412extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
413extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
414extern u8 ata_check_status(struct ata_port *ap);
415extern u8 ata_altstatus(struct ata_port *ap);
416extern u8 ata_chk_err(struct ata_port *ap);
417extern void ata_exec_command(struct ata_port *ap, struct ata_taskfile *tf);
418extern int ata_port_start (struct ata_port *ap);
419extern void ata_port_stop (struct ata_port *ap);
aa8f0dc6 420extern void ata_host_stop (struct ata_host_set *host_set);
1da177e4
LT		 421extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
422extern void ata_qc_prep(struct ata_queued_cmd *qc);
423extern int ata_qc_issue_prot(struct ata_queued_cmd *qc);
424extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
425 unsigned int buflen);
426extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
427 unsigned int n_elem);
428extern unsigned int ata_dev_classify(struct ata_taskfile *tf);
429extern void ata_dev_id_string(u16 *id, unsigned char *s,
430 unsigned int ofs, unsigned int len);
6f2f3812 431extern void ata_dev_config(struct ata_port *ap, unsigned int i);
1da177e4
LT		 432extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
433extern void ata_bmdma_start (struct ata_queued_cmd *qc);
b73fc89f 434extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
1da177e4
LT		 435extern u8 ata_bmdma_status(struct ata_port *ap);
436extern void ata_bmdma_irq_clear(struct ata_port *ap);
437extern void ata_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat);
438extern void ata_eng_timeout(struct ata_port *ap);
439extern void ata_scsi_simulate(u16 *id, struct scsi_cmnd *cmd,
440 void (*done)(struct scsi_cmnd *));
441extern int ata_std_bios_param(struct scsi_device *sdev,
442 struct block_device *bdev,
443 sector_t capacity, int geom[]);
444extern int ata_scsi_slave_config(struct scsi_device *sdev);
445
446
447#ifdef CONFIG_PCI
448struct pci_bits {
449 unsigned int reg; /* PCI config register to read */
450 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
451 unsigned long mask;
452 unsigned long val;
453};
454
374b1873 455extern void ata_pci_host_stop (struct ata_host_set *host_set);
1da177e4
LT		 456extern struct ata_probe_ent *
457ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port);
458extern int pci_test_config_bits(struct pci_dev *pdev, struct pci_bits *bits);
459
460#endif /* CONFIG_PCI */
461
462
463static inline unsigned int ata_tag_valid(unsigned int tag)
464{
465 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
466}
467
468static inline unsigned int ata_dev_present(struct ata_device *dev)
469{
470 return ((dev->class == ATA_DEV_ATA) ||
471 (dev->class == ATA_DEV_ATAPI));
472}
473
474static inline u8 ata_chk_status(struct ata_port *ap)
475{
476 return ap->ops->check_status(ap);
477}
478
0baab86b
EF		 479
480/**
481 * ata_pause - Flush writes and pause 400 nanoseconds.
482 * @ap: Port to wait for.
483 *
484 * LOCKING:
485 * Inherited from caller.
486 */
487
1da177e4
LT		 488static inline void ata_pause(struct ata_port *ap)
489{
490 ata_altstatus(ap);
491 ndelay(400);
492}
493
0baab86b
EF		 494
495/**
496 * ata_busy_wait - Wait for a port status register
497 * @ap: Port to wait for.
498 *
499 * Waits up to max*10 microseconds for the selected bits in the port's
500 * status register to be cleared.
501 * Returns final value of status register.
502 *
503 * LOCKING:
504 * Inherited from caller.
505 */
506
1da177e4
LT		 507static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
508 unsigned int max)
509{
510 u8 status;
511
512 do {
513 udelay(10);
514 status = ata_chk_status(ap);
515 max--;
516 } while ((status & bits) && (max > 0));
517
518 return status;
519}
520
0baab86b
EF		 521
522/**
523 * ata_wait_idle - Wait for a port to be idle.
524 * @ap: Port to wait for.
525 *
526 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
527 * Returns final value of status register.
528 *
529 * LOCKING:
530 * Inherited from caller.
531 */
532
1da177e4
LT		 533static inline u8 ata_wait_idle(struct ata_port *ap)
534{
535 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
536
537 if (status & (ATA_BUSY | ATA_DRQ)) {
538 unsigned long l = ap->ioaddr.status_addr;
539 printk(KERN_WARNING
540 "ATA: abnormal status 0x%X on port 0x%lX\n",
541 status, l);
542 }
543
544 return status;
545}
546
547static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
548{
549 qc->tf.ctl |= ATA_NIEN;
550}
551
552static inline struct ata_queued_cmd *ata_qc_from_tag (struct ata_port *ap,
553 unsigned int tag)
554{
555 if (likely(ata_tag_valid(tag)))
556 return &ap->qcmd[tag];
557 return NULL;
558}
559
560static inline void ata_tf_init(struct ata_port *ap, struct ata_taskfile *tf, unsigned int device)
561{
562 memset(tf, 0, sizeof(*tf));
563
564 tf->ctl = ap->ctl;
565 if (device == 0)
566 tf->device = ATA_DEVICE_OBS;
567 else
568 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
569}
570
0baab86b
EF		 571
572/**
573 * ata_irq_on - Enable interrupts on a port.
574 * @ap: Port on which interrupts are enabled.
575 *
576 * Enable interrupts on a legacy IDE device using MMIO or PIO,
577 * wait for idle, clear any pending interrupts.
578 *
579 * LOCKING:
580 * Inherited from caller.
581 */
582
1da177e4
LT		 583static inline u8 ata_irq_on(struct ata_port *ap)
584{
585 struct ata_ioports *ioaddr = &ap->ioaddr;
586 u8 tmp;
587
588 ap->ctl &= ~ATA_NIEN;
589 ap->last_ctl = ap->ctl;
590
591 if (ap->flags & ATA_FLAG_MMIO)
592 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
593 else
594 outb(ap->ctl, ioaddr->ctl_addr);
595 tmp = ata_wait_idle(ap);
596
597 ap->ops->irq_clear(ap);
598
599 return tmp;
600}
601
0baab86b
EF		 602
603/**
604 * ata_irq_ack - Acknowledge a device interrupt.
605 * @ap: Port on which interrupts are enabled.
606 *
607 * Wait up to 10 ms for legacy IDE device to become idle (BUSY
608 * or BUSY+DRQ clear). Obtain dma status and port status from
609 * device. Clear the interrupt. Return port status.
610 *
611 * LOCKING:
612 */
613
1da177e4
LT		 614static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
615{
616 unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
617 u8 host_stat, post_stat, status;
618
619 status = ata_busy_wait(ap, bits, 1000);
620 if (status & bits)
621 DPRINTK("abnormal status 0x%X\n", status);
622
623 /* get controller status; clear intr, err bits */
624 if (ap->flags & ATA_FLAG_MMIO) {
625 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
626 host_stat = readb(mmio + ATA_DMA_STATUS);
627 writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
628 mmio + ATA_DMA_STATUS);
629
630 post_stat = readb(mmio + ATA_DMA_STATUS);
631 } else {
632 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
633 outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
634 ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
635
636 post_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
637 }
638
639 VPRINTK("irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
640 host_stat, post_stat, status);
641
642 return status;
643}
644
645static inline u32 scr_read(struct ata_port *ap, unsigned int reg)
646{
647 return ap->ops->scr_read(ap, reg);
648}
649
650static inline void scr_write(struct ata_port *ap, unsigned int reg, u32 val)
651{
652 ap->ops->scr_write(ap, reg, val);
653}
654
8a60a071 655static inline void scr_write_flush(struct ata_port *ap, unsigned int reg,
cdcca89e
BR		 656 u32 val)
657{
658 ap->ops->scr_write(ap, reg, val);
659 (void) ap->ops->scr_read(ap, reg);
660}
661
1da177e4
LT		 662static inline unsigned int sata_dev_present(struct ata_port *ap)
663{
664 return ((scr_read(ap, SCR_STATUS) & 0xf) == 0x3) ? 1 : 0;
665}
666
667static inline int ata_try_flush_cache(struct ata_device *dev)
668{
669 return ata_id_wcache_enabled(dev->id) ||
670 ata_id_has_flush(dev->id) ||
671 ata_id_has_flush_ext(dev->id);
672}
673
674#endif /* __LINUX_LIBATA_H__ */
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