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libata: handle early device PIO modes correctly
[linux-block.git] / include / linux / libata.h
CommitLineData
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 */
8bf62ece 100 ATA_DFLAG_LBA = (1 << 3), /* device supports LBA */
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 */
c1389503
TH		 119 ATA_FLAG_NOINTR = (1 << 9), /* FIXME: Remove this once
120 * proper HSM is in place. */
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,
47a86593
AC		 158
159 /* Masks for port functions */
160 ATA_PORT_PRIMARY = (1 << 0),
161 ATA_PORT_SECONDARY = (1 << 1),
1da177e4
LT		 162};
163
14be71f4
AL		 164enum 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,
1da177e4
LT		 173};
174
175/* forward declarations */
176struct scsi_device;
177struct ata_port_operations;
178struct ata_port;
179struct ata_queued_cmd;
180
181/* typedefs */
182typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc, u8 drv_stat);
183
184struct ata_ioports {
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;
200};
201
202struct ata_probe_ent {
203 struct list_head node;
204 struct device *dev;
205 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;
214 unsigned long irq;
215 unsigned int irq_flags;
216 unsigned long host_flags;
217 void __iomem *mmio_base;
218 void *private_data;
219};
220
221struct ata_host_set {
222 spinlock_t lock;
223 struct device *dev;
224 unsigned long irq;
225 void __iomem *mmio_base;
226 unsigned int n_ports;
227 void *private_data;
228 struct ata_port_operations *ops;
229 struct ata_port * ports[0];
230};
231
232struct ata_queued_cmd {
233 struct ata_port *ap;
234 struct ata_device *dev;
235
236 struct scsi_cmnd *scsicmd;
237 void (*scsidone)(struct scsi_cmnd *);
238
239 struct ata_taskfile tf;
240 u8 cdb[ATAPI_CDB_LEN];
241
242 unsigned long flags; /* ATA_QCFLAG_xxx */
243 unsigned int tag;
244 unsigned int n_elem;
245
246 int dma_dir;
247
248 unsigned int nsect;
249 unsigned int cursect;
250
251 unsigned int nbytes;
252 unsigned int curbytes;
253
254 unsigned int cursg;
255 unsigned int cursg_ofs;
256
257 struct scatterlist sgent;
258 void *buf_virt;
259
260 struct scatterlist *sg;
261
262 ata_qc_cb_t complete_fn;
263
264 struct completion *waiting;
265
266 void *private_data;
267};
268
269struct ata_host_stats {
270 unsigned long unhandled_irq;
271 unsigned long idle_irq;
272 unsigned long rw_reqbuf;
273};
274
275struct ata_device {
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 */
281 u8 pio_mode;
282 u8 dma_mode;
283 u8 xfer_mode;
284 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
285
8cbd6df1
AL		 286 unsigned int multi_count; /* sectors count for
287 READ/WRITE MULTIPLE */
8bf62ece
AL		 288
289 /* for CHS addressing */
290 u16 cylinders; /* Number of cylinders */
291 u16 heads; /* Number of heads */
292 u16 sectors; /* Number of sectors per track */
1da177e4
LT		 293};
294
295struct ata_port {
296 struct Scsi_Host *host; /* our co-allocated scsi host */
297 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 */
302
303 struct ata_prd *prd; /* our SG list */
304 dma_addr_t prd_dma; /* and its DMA mapping */
305
306 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
307
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;
317
318 struct ata_device device[ATA_MAX_DEVICES];
319
320 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
321 unsigned long qactive;
322 unsigned int active_tag;
323
324 struct ata_host_stats stats;
325 struct ata_host_set *host_set;
326
327 struct work_struct packet_task;
328
329 struct work_struct pio_task;
14be71f4 330 unsigned int hsm_task_state;
1da177e4
LT		 331 unsigned long pio_task_timeout;
332
333 void *private_data;
334};
335
336struct ata_port_operations {
337 void (*port_disable) (struct ata_port *);
338
339 void (*dev_config) (struct ata_port *, struct ata_device *);
340
341 void (*set_piomode) (struct ata_port *, struct ata_device *);
342 void (*set_dmamode) (struct ata_port *, struct ata_device *);
343
344 void (*tf_load) (struct ata_port *ap, struct ata_taskfile *tf);
345 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
346
347 void (*exec_command)(struct ata_port *ap, struct ata_taskfile *tf);
348 u8 (*check_status)(struct ata_port *ap);
349 u8 (*check_altstatus)(struct ata_port *ap);
350 u8 (*check_err)(struct ata_port *ap);
351 void (*dev_select)(struct ata_port *ap, unsigned int device);
352
353 void (*phy_reset) (struct ata_port *ap);
354 void (*post_set_mode) (struct ata_port *ap);
355
356 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
357
358 void (*bmdma_setup) (struct ata_queued_cmd *qc);
359 void (*bmdma_start) (struct ata_queued_cmd *qc);
360
361 void (*qc_prep) (struct ata_queued_cmd *qc);
362 int (*qc_issue) (struct ata_queued_cmd *qc);
363
364 void (*eng_timeout) (struct ata_port *ap);
365
366 irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
367 void (*irq_clear) (struct ata_port *);
368
369 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
370 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
371 u32 val);
372
373 int (*port_start) (struct ata_port *ap);
374 void (*port_stop) (struct ata_port *ap);
375
376 void (*host_stop) (struct ata_host_set *host_set);
377
b73fc89f 378 void (*bmdma_stop) (struct ata_queued_cmd *qc);
1da177e4
LT		 379 u8 (*bmdma_status) (struct ata_port *ap);
380};
381
382struct ata_port_info {
383 Scsi_Host_Template *sht;
384 unsigned long host_flags;
385 unsigned long pio_mask;
386 unsigned long mwdma_mask;
387 unsigned long udma_mask;
388 struct ata_port_operations *port_ops;
389};
390
391
392extern void ata_port_probe(struct ata_port *);
393extern void __sata_phy_reset(struct ata_port *ap);
394extern void sata_phy_reset(struct ata_port *ap);
395extern void ata_bus_reset(struct ata_port *ap);
396extern void ata_port_disable(struct ata_port *);
397extern void ata_std_ports(struct ata_ioports *ioaddr);
398#ifdef CONFIG_PCI
399extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
400 unsigned int n_ports);
401extern void ata_pci_remove_one (struct pci_dev *pdev);
402#endif /* CONFIG_PCI */
403extern int ata_device_add(struct ata_probe_ent *ent);
17b14451 404extern void ata_host_set_remove(struct ata_host_set *host_set);
1da177e4
LT		 405extern int ata_scsi_detect(Scsi_Host_Template *sht);
406extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
407extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
408extern int ata_scsi_error(struct Scsi_Host *host);
409extern int ata_scsi_release(struct Scsi_Host *host);
410extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
67846b30
JG		 411extern int ata_ratelimit(void);
412
1da177e4
LT		 413/*
414 * Default driver ops implementations
415 */
416extern void ata_tf_load(struct ata_port *ap, struct ata_taskfile *tf);
417extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
418extern void ata_tf_to_fis(struct ata_taskfile *tf, u8 *fis, u8 pmp);
419extern void ata_tf_from_fis(u8 *fis, struct ata_taskfile *tf);
420extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
421extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
422extern u8 ata_check_status(struct ata_port *ap);
423extern u8 ata_altstatus(struct ata_port *ap);
424extern u8 ata_chk_err(struct ata_port *ap);
425extern void ata_exec_command(struct ata_port *ap, struct ata_taskfile *tf);
426extern int ata_port_start (struct ata_port *ap);
427extern void ata_port_stop (struct ata_port *ap);
aa8f0dc6 428extern void ata_host_stop (struct ata_host_set *host_set);
1da177e4
LT		 429extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
430extern void ata_qc_prep(struct ata_queued_cmd *qc);
431extern int ata_qc_issue_prot(struct ata_queued_cmd *qc);
432extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
433 unsigned int buflen);
434extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
435 unsigned int n_elem);
436extern unsigned int ata_dev_classify(struct ata_taskfile *tf);
437extern void ata_dev_id_string(u16 *id, unsigned char *s,
438 unsigned int ofs, unsigned int len);
6f2f3812 439extern void ata_dev_config(struct ata_port *ap, unsigned int i);
1da177e4
LT		 440extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
441extern void ata_bmdma_start (struct ata_queued_cmd *qc);
b73fc89f 442extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
1da177e4
LT		 443extern u8 ata_bmdma_status(struct ata_port *ap);
444extern void ata_bmdma_irq_clear(struct ata_port *ap);
445extern void ata_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat);
446extern void ata_eng_timeout(struct ata_port *ap);
447extern void ata_scsi_simulate(u16 *id, struct scsi_cmnd *cmd,
448 void (*done)(struct scsi_cmnd *));
449extern int ata_std_bios_param(struct scsi_device *sdev,
450 struct block_device *bdev,
451 sector_t capacity, int geom[]);
452extern int ata_scsi_slave_config(struct scsi_device *sdev);
453
454
455#ifdef CONFIG_PCI
456struct pci_bits {
457 unsigned int reg; /* PCI config register to read */
458 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
459 unsigned long mask;
460 unsigned long val;
461};
462
374b1873 463extern void ata_pci_host_stop (struct ata_host_set *host_set);
1da177e4 464extern struct ata_probe_ent *
47a86593 465ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int portmask);
1da177e4
LT		 466extern int pci_test_config_bits(struct pci_dev *pdev, struct pci_bits *bits);
467
468#endif /* CONFIG_PCI */
469
470
471static inline unsigned int ata_tag_valid(unsigned int tag)
472{
473 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
474}
475
476static inline unsigned int ata_dev_present(struct ata_device *dev)
477{
478 return ((dev->class == ATA_DEV_ATA) ||
479 (dev->class == ATA_DEV_ATAPI));
480}
481
482static inline u8 ata_chk_status(struct ata_port *ap)
483{
484 return ap->ops->check_status(ap);
485}
486
0baab86b
EF		 487
488/**
489 * ata_pause - Flush writes and pause 400 nanoseconds.
490 * @ap: Port to wait for.
491 *
492 * LOCKING:
493 * Inherited from caller.
494 */
495
1da177e4
LT		 496static inline void ata_pause(struct ata_port *ap)
497{
498 ata_altstatus(ap);
499 ndelay(400);
500}
501
0baab86b
EF		 502
503/**
504 * ata_busy_wait - Wait for a port status register
505 * @ap: Port to wait for.
506 *
507 * Waits up to max*10 microseconds for the selected bits in the port's
508 * status register to be cleared.
509 * Returns final value of status register.
510 *
511 * LOCKING:
512 * Inherited from caller.
513 */
514
1da177e4
LT		 515static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
516 unsigned int max)
517{
518 u8 status;
519
520 do {
521 udelay(10);
522 status = ata_chk_status(ap);
523 max--;
524 } while ((status & bits) && (max > 0));
525
526 return status;
527}
528
0baab86b
EF		 529
530/**
531 * ata_wait_idle - Wait for a port to be idle.
532 * @ap: Port to wait for.
533 *
534 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
535 * Returns final value of status register.
536 *
537 * LOCKING:
538 * Inherited from caller.
539 */
540
1da177e4
LT		 541static inline u8 ata_wait_idle(struct ata_port *ap)
542{
543 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
544
545 if (status & (ATA_BUSY | ATA_DRQ)) {
546 unsigned long l = ap->ioaddr.status_addr;
547 printk(KERN_WARNING
548 "ATA: abnormal status 0x%X on port 0x%lX\n",
549 status, l);
550 }
551
552 return status;
553}
554
555static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
556{
557 qc->tf.ctl |= ATA_NIEN;
558}
559
560static inline struct ata_queued_cmd *ata_qc_from_tag (struct ata_port *ap,
561 unsigned int tag)
562{
563 if (likely(ata_tag_valid(tag)))
564 return &ap->qcmd[tag];
565 return NULL;
566}
567
568static inline void ata_tf_init(struct ata_port *ap, struct ata_taskfile *tf, unsigned int device)
569{
570 memset(tf, 0, sizeof(*tf));
571
572 tf->ctl = ap->ctl;
573 if (device == 0)
574 tf->device = ATA_DEVICE_OBS;
575 else
576 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
577}
578
0baab86b
EF		 579
580/**
581 * ata_irq_on - Enable interrupts on a port.
582 * @ap: Port on which interrupts are enabled.
583 *
584 * Enable interrupts on a legacy IDE device using MMIO or PIO,
585 * wait for idle, clear any pending interrupts.
586 *
587 * LOCKING:
588 * Inherited from caller.
589 */
590
1da177e4
LT		 591static inline u8 ata_irq_on(struct ata_port *ap)
592{
593 struct ata_ioports *ioaddr = &ap->ioaddr;
594 u8 tmp;
595
596 ap->ctl &= ~ATA_NIEN;
597 ap->last_ctl = ap->ctl;
598
599 if (ap->flags & ATA_FLAG_MMIO)
600 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
601 else
602 outb(ap->ctl, ioaddr->ctl_addr);
603 tmp = ata_wait_idle(ap);
604
605 ap->ops->irq_clear(ap);
606
607 return tmp;
608}
609
0baab86b
EF		 610
611/**
612 * ata_irq_ack - Acknowledge a device interrupt.
613 * @ap: Port on which interrupts are enabled.
614 *
615 * Wait up to 10 ms for legacy IDE device to become idle (BUSY
616 * or BUSY+DRQ clear). Obtain dma status and port status from
617 * device. Clear the interrupt. Return port status.
618 *
619 * LOCKING:
620 */
621
1da177e4
LT		 622static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
623{
624 unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
625 u8 host_stat, post_stat, status;
626
627 status = ata_busy_wait(ap, bits, 1000);
628 if (status & bits)
629 DPRINTK("abnormal status 0x%X\n", status);
630
631 /* get controller status; clear intr, err bits */
632 if (ap->flags & ATA_FLAG_MMIO) {
633 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
634 host_stat = readb(mmio + ATA_DMA_STATUS);
635 writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
636 mmio + ATA_DMA_STATUS);
637
638 post_stat = readb(mmio + ATA_DMA_STATUS);
639 } else {
640 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
641 outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
642 ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
643
644 post_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
645 }
646
647 VPRINTK("irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
648 host_stat, post_stat, status);
649
650 return status;
651}
652
653static inline u32 scr_read(struct ata_port *ap, unsigned int reg)
654{
655 return ap->ops->scr_read(ap, reg);
656}
657
658static inline void scr_write(struct ata_port *ap, unsigned int reg, u32 val)
659{
660 ap->ops->scr_write(ap, reg, val);
661}
662
8a60a071 663static inline void scr_write_flush(struct ata_port *ap, unsigned int reg,
cdcca89e
BR		 664 u32 val)
665{
666 ap->ops->scr_write(ap, reg, val);
667 (void) ap->ops->scr_read(ap, reg);
668}
669
1da177e4
LT		 670static inline unsigned int sata_dev_present(struct ata_port *ap)
671{
672 return ((scr_read(ap, SCR_STATUS) & 0xf) == 0x3) ? 1 : 0;
673}
674
675static inline int ata_try_flush_cache(struct ata_device *dev)
676{
677 return ata_id_wcache_enabled(dev->id) ||
678 ata_id_has_flush(dev->id) ||
679 ata_id_has_flush_ext(dev->id);
680}
681
682#endif /* __LINUX_LIBATA_H__ */
Linux 6.x block layer and io_uring tree(s)