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libata-link: implement ata_link_abort()
[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 <linux/dma-mapping.h>
33 #include <asm/scatterlist.h>
34 #include <linux/io.h>
35 #include <linux/ata.h>
36 #include <linux/workqueue.h>
37 #include <scsi/scsi_host.h>
38 #include <linux/acpi.h>
39
40 /*
41 * Define if arch has non-standard setup. This is a _PCI_ standard
42 * not a legacy or ISA standard.
43 */
44 #ifdef CONFIG_ATA_NONSTANDARD
45 #include <asm/libata-portmap.h>
46 #else
47 #include <asm-generic/libata-portmap.h>
48 #endif
49
50 /*
51 * compile-time options: to be removed as soon as all the drivers are
52 * converted to the new debugging mechanism
53 */
54 #undef ATA_DEBUG /* debugging output */
55 #undef ATA_VERBOSE_DEBUG /* yet more debugging output */
56 #undef ATA_IRQ_TRAP /* define to ack screaming irqs */
57 #undef ATA_NDEBUG /* define to disable quick runtime checks */
58
59
60 /* note: prints function name for you */
61 #ifdef ATA_DEBUG
62 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
63 #ifdef ATA_VERBOSE_DEBUG
64 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
65 #else
66 #define VPRINTK(fmt, args...)
67 #endif /* ATA_VERBOSE_DEBUG */
68 #else
69 #define DPRINTK(fmt, args...)
70 #define VPRINTK(fmt, args...)
71 #endif /* ATA_DEBUG */
72
73 #define BPRINTK(fmt, args...) if (ap->flags & ATA_FLAG_DEBUGMSG) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
74
75 /* NEW: debug levels */
76 #define HAVE_LIBATA_MSG 1
77
78 enum {
79 ATA_MSG_DRV = 0x0001,
80 ATA_MSG_INFO = 0x0002,
81 ATA_MSG_PROBE = 0x0004,
82 ATA_MSG_WARN = 0x0008,
83 ATA_MSG_MALLOC = 0x0010,
84 ATA_MSG_CTL = 0x0020,
85 ATA_MSG_INTR = 0x0040,
86 ATA_MSG_ERR = 0x0080,
87 };
88
89 #define ata_msg_drv(p) ((p)->msg_enable & ATA_MSG_DRV)
90 #define ata_msg_info(p) ((p)->msg_enable & ATA_MSG_INFO)
91 #define ata_msg_probe(p) ((p)->msg_enable & ATA_MSG_PROBE)
92 #define ata_msg_warn(p) ((p)->msg_enable & ATA_MSG_WARN)
93 #define ata_msg_malloc(p) ((p)->msg_enable & ATA_MSG_MALLOC)
94 #define ata_msg_ctl(p) ((p)->msg_enable & ATA_MSG_CTL)
95 #define ata_msg_intr(p) ((p)->msg_enable & ATA_MSG_INTR)
96 #define ata_msg_err(p) ((p)->msg_enable & ATA_MSG_ERR)
97
98 static inline u32 ata_msg_init(int dval, int default_msg_enable_bits)
99 {
100 if (dval < 0 || dval >= (sizeof(u32) * 8))
101 return default_msg_enable_bits; /* should be 0x1 - only driver info msgs */
102 if (!dval)
103 return 0;
104 return (1 << dval) - 1;
105 }
106
107 /* defines only for the constants which don't work well as enums */
108 #define ATA_TAG_POISON 0xfafbfcfdU
109
110 /* move to PCI layer? */
111 static inline struct device *pci_dev_to_dev(struct pci_dev *pdev)
112 {
113 return &pdev->dev;
114 }
115
116 enum {
117 /* various global constants */
118 LIBATA_MAX_PRD = ATA_MAX_PRD / 2,
119 LIBATA_DUMB_MAX_PRD = ATA_MAX_PRD / 4, /* Worst case */
120 ATA_MAX_PORTS = 8,
121 ATA_DEF_QUEUE = 1,
122 /* tag ATA_MAX_QUEUE - 1 is reserved for internal commands */
123 ATA_MAX_QUEUE = 32,
124 ATA_TAG_INTERNAL = ATA_MAX_QUEUE - 1,
125 ATA_MAX_BUS = 2,
126 ATA_DEF_BUSY_WAIT = 10000,
127 ATA_SHORT_PAUSE = (HZ >> 6) + 1,
128
129 ATA_SHT_EMULATED = 1,
130 ATA_SHT_CMD_PER_LUN = 1,
131 ATA_SHT_THIS_ID = -1,
132 ATA_SHT_USE_CLUSTERING = 1,
133
134 /* struct ata_device stuff */
135 ATA_DFLAG_LBA = (1 << 0), /* device supports LBA */
136 ATA_DFLAG_LBA48 = (1 << 1), /* device supports LBA48 */
137 ATA_DFLAG_CDB_INTR = (1 << 2), /* device asserts INTRQ when ready for CDB */
138 ATA_DFLAG_NCQ = (1 << 3), /* device supports NCQ */
139 ATA_DFLAG_FLUSH_EXT = (1 << 4), /* do FLUSH_EXT instead of FLUSH */
140 ATA_DFLAG_ACPI_PENDING = (1 << 5), /* ACPI resume action pending */
141 ATA_DFLAG_ACPI_FAILED = (1 << 6), /* ACPI on devcfg has failed */
142 ATA_DFLAG_CFG_MASK = (1 << 8) - 1,
143
144 ATA_DFLAG_PIO = (1 << 8), /* device limited to PIO mode */
145 ATA_DFLAG_NCQ_OFF = (1 << 9), /* device limited to non-NCQ mode */
146 ATA_DFLAG_SPUNDOWN = (1 << 10), /* XXX: for spindown_compat */
147 ATA_DFLAG_INIT_MASK = (1 << 16) - 1,
148
149 ATA_DFLAG_DETACH = (1 << 16),
150 ATA_DFLAG_DETACHED = (1 << 17),
151
152 ATA_DEV_UNKNOWN = 0, /* unknown device */
153 ATA_DEV_ATA = 1, /* ATA device */
154 ATA_DEV_ATA_UNSUP = 2, /* ATA device (unsupported) */
155 ATA_DEV_ATAPI = 3, /* ATAPI device */
156 ATA_DEV_ATAPI_UNSUP = 4, /* ATAPI device (unsupported) */
157 ATA_DEV_NONE = 5, /* no device */
158
159 /* struct ata_link flags */
160 ATA_LFLAG_HRST_TO_RESUME = (1 << 0), /* hardreset to resume link */
161 ATA_LFLAG_SKIP_D2H_BSY = (1 << 1), /* can't wait for the first D2H
162 * Register FIS clearing BSY */
163
164 /* struct ata_port flags */
165 ATA_FLAG_SLAVE_POSS = (1 << 0), /* host supports slave dev */
166 /* (doesn't imply presence) */
167 ATA_FLAG_SATA = (1 << 1),
168 ATA_FLAG_NO_LEGACY = (1 << 2), /* no legacy mode check */
169 ATA_FLAG_MMIO = (1 << 3), /* use MMIO, not PIO */
170 ATA_FLAG_SRST = (1 << 4), /* (obsolete) use ATA SRST, not E.D.D. */
171 ATA_FLAG_SATA_RESET = (1 << 5), /* (obsolete) use COMRESET */
172 ATA_FLAG_NO_ATAPI = (1 << 6), /* No ATAPI support */
173 ATA_FLAG_PIO_DMA = (1 << 7), /* PIO cmds via DMA */
174 ATA_FLAG_PIO_LBA48 = (1 << 8), /* Host DMA engine is LBA28 only */
175 ATA_FLAG_PIO_POLLING = (1 << 9), /* use polling PIO if LLD
176 * doesn't handle PIO interrupts */
177 ATA_FLAG_NCQ = (1 << 10), /* host supports NCQ */
178 ATA_FLAG_DEBUGMSG = (1 << 13),
179 ATA_FLAG_IGN_SIMPLEX = (1 << 15), /* ignore SIMPLEX */
180 ATA_FLAG_NO_IORDY = (1 << 16), /* controller lacks iordy */
181 ATA_FLAG_ACPI_SATA = (1 << 17), /* need native SATA ACPI layout */
182
183 /* The following flag belongs to ap->pflags but is kept in
184 * ap->flags because it's referenced in many LLDs and will be
185 * removed in not-too-distant future.
186 */
187 ATA_FLAG_DISABLED = (1 << 23), /* port is disabled, ignore it */
188
189 /* bits 24:31 of ap->flags are reserved for LLD specific flags */
190
191 /* struct ata_port pflags */
192 ATA_PFLAG_EH_PENDING = (1 << 0), /* EH pending */
193 ATA_PFLAG_EH_IN_PROGRESS = (1 << 1), /* EH in progress */
194 ATA_PFLAG_FROZEN = (1 << 2), /* port is frozen */
195 ATA_PFLAG_RECOVERED = (1 << 3), /* recovery action performed */
196 ATA_PFLAG_LOADING = (1 << 4), /* boot/loading probe */
197 ATA_PFLAG_UNLOADING = (1 << 5), /* module is unloading */
198 ATA_PFLAG_SCSI_HOTPLUG = (1 << 6), /* SCSI hotplug scheduled */
199 ATA_PFLAG_INITIALIZING = (1 << 7), /* being initialized, don't touch */
200
201 ATA_PFLAG_SUSPENDED = (1 << 17), /* port is suspended (power) */
202 ATA_PFLAG_PM_PENDING = (1 << 18), /* PM operation pending */
203 ATA_PFLAG_GTM_VALID = (1 << 19), /* acpi_gtm data valid */
204
205 /* struct ata_queued_cmd flags */
206 ATA_QCFLAG_ACTIVE = (1 << 0), /* cmd not yet ack'd to scsi lyer */
207 ATA_QCFLAG_SG = (1 << 1), /* have s/g table? */
208 ATA_QCFLAG_SINGLE = (1 << 2), /* no s/g, just a single buffer */
209 ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
210 ATA_QCFLAG_IO = (1 << 3), /* standard IO command */
211 ATA_QCFLAG_RESULT_TF = (1 << 4), /* result TF requested */
212
213 ATA_QCFLAG_FAILED = (1 << 16), /* cmd failed and is owned by EH */
214 ATA_QCFLAG_SENSE_VALID = (1 << 17), /* sense data valid */
215 ATA_QCFLAG_EH_SCHEDULED = (1 << 18), /* EH scheduled (obsolete) */
216
217 /* host set flags */
218 ATA_HOST_SIMPLEX = (1 << 0), /* Host is simplex, one DMA channel per host only */
219 ATA_HOST_STARTED = (1 << 1), /* Host started */
220
221 /* bits 24:31 of host->flags are reserved for LLD specific flags */
222
223 /* various lengths of time */
224 ATA_TMOUT_BOOT = 30 * HZ, /* heuristic */
225 ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* heuristic */
226 ATA_TMOUT_INTERNAL = 30 * HZ,
227 ATA_TMOUT_INTERNAL_QUICK = 5 * HZ,
228
229 /* ATA bus states */
230 BUS_UNKNOWN = 0,
231 BUS_DMA = 1,
232 BUS_IDLE = 2,
233 BUS_NOINTR = 3,
234 BUS_NODATA = 4,
235 BUS_TIMER = 5,
236 BUS_PIO = 6,
237 BUS_EDD = 7,
238 BUS_IDENTIFY = 8,
239 BUS_PACKET = 9,
240
241 /* SATA port states */
242 PORT_UNKNOWN = 0,
243 PORT_ENABLED = 1,
244 PORT_DISABLED = 2,
245
246 /* encoding various smaller bitmaps into a single
247 * unsigned int bitmap
248 */
249 ATA_BITS_PIO = 7,
250 ATA_BITS_MWDMA = 5,
251 ATA_BITS_UDMA = 8,
252
253 ATA_SHIFT_PIO = 0,
254 ATA_SHIFT_MWDMA = ATA_SHIFT_PIO + ATA_BITS_PIO,
255 ATA_SHIFT_UDMA = ATA_SHIFT_MWDMA + ATA_BITS_MWDMA,
256
257 ATA_MASK_PIO = ((1 << ATA_BITS_PIO) - 1) << ATA_SHIFT_PIO,
258 ATA_MASK_MWDMA = ((1 << ATA_BITS_MWDMA) - 1) << ATA_SHIFT_MWDMA,
259 ATA_MASK_UDMA = ((1 << ATA_BITS_UDMA) - 1) << ATA_SHIFT_UDMA,
260
261 /* size of buffer to pad xfers ending on unaligned boundaries */
262 ATA_DMA_PAD_SZ = 4,
263 ATA_DMA_PAD_BUF_SZ = ATA_DMA_PAD_SZ * ATA_MAX_QUEUE,
264
265 /* ering size */
266 ATA_ERING_SIZE = 32,
267
268 /* desc_len for ata_eh_info and context */
269 ATA_EH_DESC_LEN = 80,
270
271 /* reset / recovery action types */
272 ATA_EH_REVALIDATE = (1 << 0),
273 ATA_EH_SOFTRESET = (1 << 1),
274 ATA_EH_HARDRESET = (1 << 2),
275
276 ATA_EH_RESET_MASK = ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
277 ATA_EH_PERDEV_MASK = ATA_EH_REVALIDATE,
278
279 /* ata_eh_info->flags */
280 ATA_EHI_HOTPLUGGED = (1 << 0), /* could have been hotplugged */
281 ATA_EHI_RESUME_LINK = (1 << 1), /* resume link (reset modifier) */
282 ATA_EHI_NO_AUTOPSY = (1 << 2), /* no autopsy */
283 ATA_EHI_QUIET = (1 << 3), /* be quiet */
284
285 ATA_EHI_DID_SOFTRESET = (1 << 16), /* already soft-reset this port */
286 ATA_EHI_DID_HARDRESET = (1 << 17), /* already soft-reset this port */
287 ATA_EHI_PRINTINFO = (1 << 18), /* print configuration info */
288 ATA_EHI_SETMODE = (1 << 19), /* configure transfer mode */
289 ATA_EHI_POST_SETMODE = (1 << 20), /* revaildating after setmode */
290
291 ATA_EHI_DID_RESET = ATA_EHI_DID_SOFTRESET | ATA_EHI_DID_HARDRESET,
292 ATA_EHI_RESET_MODIFIER_MASK = ATA_EHI_RESUME_LINK,
293
294 /* max repeat if error condition is still set after ->error_handler */
295 ATA_EH_MAX_REPEAT = 5,
296
297 /* how hard are we gonna try to probe/recover devices */
298 ATA_PROBE_MAX_TRIES = 3,
299 ATA_EH_DEV_TRIES = 3,
300
301 /* Horkage types. May be set by libata or controller on drives
302 (some horkage may be drive/controller pair dependant */
303
304 ATA_HORKAGE_DIAGNOSTIC = (1 << 0), /* Failed boot diag */
305 ATA_HORKAGE_NODMA = (1 << 1), /* DMA problems */
306 ATA_HORKAGE_NONCQ = (1 << 2), /* Don't use NCQ */
307 ATA_HORKAGE_MAX_SEC_128 = (1 << 3), /* Limit max sects to 128 */
308 ATA_HORKAGE_BROKEN_HPA = (1 << 4), /* Broken HPA */
309 };
310
311 enum hsm_task_states {
312 HSM_ST_IDLE, /* no command on going */
313 HSM_ST_FIRST, /* (waiting the device to)
314 write CDB or first data block */
315 HSM_ST, /* (waiting the device to) transfer data */
316 HSM_ST_LAST, /* (waiting the device to) complete command */
317 HSM_ST_ERR, /* error */
318 };
319
320 enum ata_completion_errors {
321 AC_ERR_DEV = (1 << 0), /* device reported error */
322 AC_ERR_HSM = (1 << 1), /* host state machine violation */
323 AC_ERR_TIMEOUT = (1 << 2), /* timeout */
324 AC_ERR_MEDIA = (1 << 3), /* media error */
325 AC_ERR_ATA_BUS = (1 << 4), /* ATA bus error */
326 AC_ERR_HOST_BUS = (1 << 5), /* host bus error */
327 AC_ERR_SYSTEM = (1 << 6), /* system error */
328 AC_ERR_INVALID = (1 << 7), /* invalid argument */
329 AC_ERR_OTHER = (1 << 8), /* unknown */
330 AC_ERR_NODEV_HINT = (1 << 9), /* polling device detection hint */
331 AC_ERR_NCQ = (1 << 10), /* marker for offending NCQ qc */
332 };
333
334 /* forward declarations */
335 struct scsi_device;
336 struct ata_port_operations;
337 struct ata_port;
338 struct ata_link;
339 struct ata_queued_cmd;
340
341 /* typedefs */
342 typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
343 typedef int (*ata_prereset_fn_t)(struct ata_link *link, unsigned long deadline);
344 typedef int (*ata_reset_fn_t)(struct ata_link *link, unsigned int *classes,
345 unsigned long deadline);
346 typedef void (*ata_postreset_fn_t)(struct ata_link *link, unsigned int *classes);
347
348 struct ata_ioports {
349 void __iomem *cmd_addr;
350 void __iomem *data_addr;
351 void __iomem *error_addr;
352 void __iomem *feature_addr;
353 void __iomem *nsect_addr;
354 void __iomem *lbal_addr;
355 void __iomem *lbam_addr;
356 void __iomem *lbah_addr;
357 void __iomem *device_addr;
358 void __iomem *status_addr;
359 void __iomem *command_addr;
360 void __iomem *altstatus_addr;
361 void __iomem *ctl_addr;
362 void __iomem *bmdma_addr;
363 void __iomem *scr_addr;
364 };
365
366 struct ata_host {
367 spinlock_t lock;
368 struct device *dev;
369 unsigned long irq;
370 unsigned long irq2;
371 void __iomem * const *iomap;
372 unsigned int n_ports;
373 void *private_data;
374 const struct ata_port_operations *ops;
375 unsigned long flags;
376 #ifdef CONFIG_ATA_ACPI
377 acpi_handle acpi_handle;
378 #endif
379 struct ata_port *simplex_claimed; /* channel owning the DMA */
380 struct ata_port *ports[0];
381 };
382
383 struct ata_queued_cmd {
384 struct ata_port *ap;
385 struct ata_device *dev;
386
387 struct scsi_cmnd *scsicmd;
388 void (*scsidone)(struct scsi_cmnd *);
389
390 struct ata_taskfile tf;
391 u8 cdb[ATAPI_CDB_LEN];
392
393 unsigned long flags; /* ATA_QCFLAG_xxx */
394 unsigned int tag;
395 unsigned int n_elem;
396 unsigned int orig_n_elem;
397
398 int dma_dir;
399
400 unsigned int pad_len;
401 unsigned int sect_size;
402
403 unsigned int nbytes;
404 unsigned int curbytes;
405
406 unsigned int cursg;
407 unsigned int cursg_ofs;
408
409 struct scatterlist sgent;
410 struct scatterlist pad_sgent;
411 void *buf_virt;
412
413 /* DO NOT iterate over __sg manually, use ata_for_each_sg() */
414 struct scatterlist *__sg;
415
416 unsigned int err_mask;
417 struct ata_taskfile result_tf;
418 ata_qc_cb_t complete_fn;
419
420 void *private_data;
421 void *lldd_task;
422 };
423
424 struct ata_port_stats {
425 unsigned long unhandled_irq;
426 unsigned long idle_irq;
427 unsigned long rw_reqbuf;
428 };
429
430 struct ata_ering_entry {
431 int is_io;
432 unsigned int err_mask;
433 u64 timestamp;
434 };
435
436 struct ata_ering {
437 int cursor;
438 struct ata_ering_entry ring[ATA_ERING_SIZE];
439 };
440
441 struct ata_device {
442 struct ata_link *link;
443 unsigned int devno; /* 0 or 1 */
444 unsigned long flags; /* ATA_DFLAG_xxx */
445 unsigned int horkage; /* List of broken features */
446 struct scsi_device *sdev; /* attached SCSI device */
447 #ifdef CONFIG_ATA_ACPI
448 acpi_handle acpi_handle;
449 #endif
450 /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
451 u64 n_sectors; /* size of device, if ATA */
452 unsigned int class; /* ATA_DEV_xxx */
453 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
454 u8 pio_mode;
455 u8 dma_mode;
456 u8 xfer_mode;
457 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
458
459 unsigned int multi_count; /* sectors count for
460 READ/WRITE MULTIPLE */
461 unsigned int max_sectors; /* per-device max sectors */
462 unsigned int cdb_len;
463
464 /* per-dev xfer mask */
465 unsigned int pio_mask;
466 unsigned int mwdma_mask;
467 unsigned int udma_mask;
468
469 /* for CHS addressing */
470 u16 cylinders; /* Number of cylinders */
471 u16 heads; /* Number of heads */
472 u16 sectors; /* Number of sectors per track */
473
474 /* error history */
475 struct ata_ering ering;
476 int spdn_cnt;
477 };
478
479 /* Offset into struct ata_device. Fields above it are maintained
480 * acress device init. Fields below are zeroed.
481 */
482 #define ATA_DEVICE_CLEAR_OFFSET offsetof(struct ata_device, n_sectors)
483
484 struct ata_eh_info {
485 struct ata_device *dev; /* offending device */
486 u32 serror; /* SError from LLDD */
487 unsigned int err_mask; /* port-wide err_mask */
488 unsigned int action; /* ATA_EH_* action mask */
489 unsigned int dev_action[ATA_MAX_DEVICES]; /* dev EH action */
490 unsigned int flags; /* ATA_EHI_* flags */
491
492 unsigned int probe_mask;
493
494 char desc[ATA_EH_DESC_LEN];
495 int desc_len;
496 };
497
498 struct ata_eh_context {
499 struct ata_eh_info i;
500 int tries[ATA_MAX_DEVICES];
501 unsigned int classes[ATA_MAX_DEVICES];
502 unsigned int did_probe_mask;
503 };
504
505 struct ata_acpi_drive
506 {
507 u32 pio;
508 u32 dma;
509 } __packed;
510
511 struct ata_acpi_gtm {
512 struct ata_acpi_drive drive[2];
513 u32 flags;
514 } __packed;
515
516 struct ata_link {
517 struct ata_port *ap;
518
519 unsigned int active_tag; /* active tag on this link */
520 u32 sactive; /* active NCQ commands */
521
522 unsigned int flags; /* ATA_LFLAG_xxx */
523
524 unsigned int hw_sata_spd_limit;
525 unsigned int sata_spd_limit;
526 unsigned int sata_spd; /* current SATA PHY speed */
527
528 /* record runtime error info, protected by host_set lock */
529 struct ata_eh_info eh_info;
530 /* EH context */
531 struct ata_eh_context eh_context;
532
533 struct ata_device device[ATA_MAX_DEVICES];
534 };
535
536 struct ata_port {
537 struct Scsi_Host *scsi_host; /* our co-allocated scsi host */
538 const struct ata_port_operations *ops;
539 spinlock_t *lock;
540 unsigned long flags; /* ATA_FLAG_xxx */
541 unsigned int pflags; /* ATA_PFLAG_xxx */
542 unsigned int print_id; /* user visible unique port ID */
543 unsigned int port_no; /* 0 based port no. inside the host */
544
545 struct ata_prd *prd; /* our SG list */
546 dma_addr_t prd_dma; /* and its DMA mapping */
547
548 void *pad; /* array of DMA pad buffers */
549 dma_addr_t pad_dma;
550
551 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
552
553 u8 ctl; /* cache of ATA control register */
554 u8 last_ctl; /* Cache last written value */
555 unsigned int pio_mask;
556 unsigned int mwdma_mask;
557 unsigned int udma_mask;
558 unsigned int cbl; /* cable type; ATA_CBL_xxx */
559
560 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
561 unsigned long qc_allocated;
562 unsigned int qc_active;
563
564 struct ata_link link; /* host default link */
565
566 struct ata_port_stats stats;
567 struct ata_host *host;
568 struct device *dev;
569
570 void *port_task_data;
571 struct delayed_work port_task;
572 struct delayed_work hotplug_task;
573 struct work_struct scsi_rescan_task;
574
575 unsigned int hsm_task_state;
576
577 u32 msg_enable;
578 struct list_head eh_done_q;
579 wait_queue_head_t eh_wait_q;
580
581 pm_message_t pm_mesg;
582 int *pm_result;
583
584 struct timer_list fastdrain_timer;
585 unsigned long fastdrain_cnt;
586
587 void *private_data;
588
589 #ifdef CONFIG_ATA_ACPI
590 acpi_handle acpi_handle;
591 struct ata_acpi_gtm acpi_gtm;
592 #endif
593 u8 sector_buf[ATA_SECT_SIZE]; /* owned by EH */
594 };
595
596 struct ata_port_operations {
597 void (*port_disable) (struct ata_port *);
598
599 void (*dev_config) (struct ata_device *);
600
601 void (*set_piomode) (struct ata_port *, struct ata_device *);
602 void (*set_dmamode) (struct ata_port *, struct ata_device *);
603 unsigned long (*mode_filter) (struct ata_device *, unsigned long);
604
605 void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
606 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
607
608 void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
609 u8 (*check_status)(struct ata_port *ap);
610 u8 (*check_altstatus)(struct ata_port *ap);
611 void (*dev_select)(struct ata_port *ap, unsigned int device);
612
613 void (*phy_reset) (struct ata_port *ap); /* obsolete */
614 int (*set_mode) (struct ata_link *link, struct ata_device **r_failed_dev);
615
616 int (*cable_detect) (struct ata_port *ap);
617
618 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
619
620 void (*bmdma_setup) (struct ata_queued_cmd *qc);
621 void (*bmdma_start) (struct ata_queued_cmd *qc);
622
623 void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
624
625 void (*qc_prep) (struct ata_queued_cmd *qc);
626 unsigned int (*qc_issue) (struct ata_queued_cmd *qc);
627
628 /* Error handlers. ->error_handler overrides ->eng_timeout and
629 * indicates that new-style EH is in place.
630 */
631 void (*eng_timeout) (struct ata_port *ap); /* obsolete */
632
633 void (*freeze) (struct ata_port *ap);
634 void (*thaw) (struct ata_port *ap);
635 void (*error_handler) (struct ata_port *ap);
636 void (*post_internal_cmd) (struct ata_queued_cmd *qc);
637
638 irq_handler_t irq_handler;
639 void (*irq_clear) (struct ata_port *);
640 u8 (*irq_on) (struct ata_port *);
641 u8 (*irq_ack) (struct ata_port *ap, unsigned int chk_drq);
642
643 int (*scr_read) (struct ata_port *ap, unsigned int sc_reg, u32 *val);
644 int (*scr_write) (struct ata_port *ap, unsigned int sc_reg, u32 val);
645
646 int (*port_suspend) (struct ata_port *ap, pm_message_t mesg);
647 int (*port_resume) (struct ata_port *ap);
648
649 int (*port_start) (struct ata_port *ap);
650 void (*port_stop) (struct ata_port *ap);
651
652 void (*host_stop) (struct ata_host *host);
653
654 void (*bmdma_stop) (struct ata_queued_cmd *qc);
655 u8 (*bmdma_status) (struct ata_port *ap);
656 };
657
658 struct ata_port_info {
659 struct scsi_host_template *sht;
660 unsigned long flags;
661 unsigned long link_flags;
662 unsigned long pio_mask;
663 unsigned long mwdma_mask;
664 unsigned long udma_mask;
665 const struct ata_port_operations *port_ops;
666 irq_handler_t irq_handler;
667 void *private_data;
668 };
669
670 struct ata_timing {
671 unsigned short mode; /* ATA mode */
672 unsigned short setup; /* t1 */
673 unsigned short act8b; /* t2 for 8-bit I/O */
674 unsigned short rec8b; /* t2i for 8-bit I/O */
675 unsigned short cyc8b; /* t0 for 8-bit I/O */
676 unsigned short active; /* t2 or tD */
677 unsigned short recover; /* t2i or tK */
678 unsigned short cycle; /* t0 */
679 unsigned short udma; /* t2CYCTYP/2 */
680 };
681
682 #define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
683
684 extern const unsigned long sata_deb_timing_normal[];
685 extern const unsigned long sata_deb_timing_hotplug[];
686 extern const unsigned long sata_deb_timing_long[];
687
688 extern const struct ata_port_operations ata_dummy_port_ops;
689 extern const struct ata_port_info ata_dummy_port_info;
690
691 static inline const unsigned long *
692 sata_ehc_deb_timing(struct ata_eh_context *ehc)
693 {
694 if (ehc->i.flags & ATA_EHI_HOTPLUGGED)
695 return sata_deb_timing_hotplug;
696 else
697 return sata_deb_timing_normal;
698 }
699
700 static inline int ata_port_is_dummy(struct ata_port *ap)
701 {
702 return ap->ops == &ata_dummy_port_ops;
703 }
704
705 extern void sata_print_link_status(struct ata_link *link);
706 extern void ata_port_probe(struct ata_port *);
707 extern void __sata_phy_reset(struct ata_port *ap);
708 extern void sata_phy_reset(struct ata_port *ap);
709 extern void ata_bus_reset(struct ata_port *ap);
710 extern int sata_set_spd(struct ata_link *link);
711 extern int sata_link_debounce(struct ata_link *link,
712 const unsigned long *params, unsigned long deadline);
713 extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
714 unsigned long deadline);
715 extern int ata_std_prereset(struct ata_link *link, unsigned long deadline);
716 extern int ata_std_softreset(struct ata_link *link, unsigned int *classes,
717 unsigned long deadline);
718 extern int sata_link_hardreset(struct ata_link *link,
719 const unsigned long *timing, unsigned long deadline);
720 extern int sata_std_hardreset(struct ata_link *link, unsigned int *class,
721 unsigned long deadline);
722 extern void ata_std_postreset(struct ata_link *link, unsigned int *classes);
723 extern void ata_port_disable(struct ata_port *);
724 extern void ata_std_ports(struct ata_ioports *ioaddr);
725 #ifdef CONFIG_PCI
726 extern int ata_pci_init_one (struct pci_dev *pdev,
727 const struct ata_port_info * const * ppi);
728 extern void ata_pci_remove_one (struct pci_dev *pdev);
729 #ifdef CONFIG_PM
730 extern void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg);
731 extern int __must_check ata_pci_device_do_resume(struct pci_dev *pdev);
732 extern int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
733 extern int ata_pci_device_resume(struct pci_dev *pdev);
734 #endif
735 extern int ata_pci_clear_simplex(struct pci_dev *pdev);
736 #endif /* CONFIG_PCI */
737 extern struct ata_host *ata_host_alloc(struct device *dev, int max_ports);
738 extern struct ata_host *ata_host_alloc_pinfo(struct device *dev,
739 const struct ata_port_info * const * ppi, int n_ports);
740 extern int ata_host_start(struct ata_host *host);
741 extern int ata_host_register(struct ata_host *host,
742 struct scsi_host_template *sht);
743 extern int ata_host_activate(struct ata_host *host, int irq,
744 irq_handler_t irq_handler, unsigned long irq_flags,
745 struct scsi_host_template *sht);
746 extern void ata_host_detach(struct ata_host *host);
747 extern void ata_host_init(struct ata_host *, struct device *,
748 unsigned long, const struct ata_port_operations *);
749 extern int ata_scsi_detect(struct scsi_host_template *sht);
750 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
751 extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
752 extern void ata_sas_port_destroy(struct ata_port *);
753 extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
754 struct ata_port_info *, struct Scsi_Host *);
755 extern int ata_sas_port_init(struct ata_port *);
756 extern int ata_sas_port_start(struct ata_port *ap);
757 extern void ata_sas_port_stop(struct ata_port *ap);
758 extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
759 extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
760 struct ata_port *ap);
761 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
762 extern int sata_scr_valid(struct ata_link *link);
763 extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
764 extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
765 extern int sata_scr_write_flush(struct ata_link *link, int reg, u32 val);
766 extern int ata_link_online(struct ata_link *link);
767 extern int ata_link_offline(struct ata_link *link);
768 #ifdef CONFIG_PM
769 extern int ata_host_suspend(struct ata_host *host, pm_message_t mesg);
770 extern void ata_host_resume(struct ata_host *host);
771 #endif
772 extern int ata_ratelimit(void);
773 extern int ata_busy_sleep(struct ata_port *ap,
774 unsigned long timeout_pat, unsigned long timeout);
775 extern int ata_wait_ready(struct ata_port *ap, unsigned long deadline);
776 extern void ata_port_queue_task(struct ata_port *ap, work_func_t fn,
777 void *data, unsigned long delay);
778 extern u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
779 unsigned long interval_msec,
780 unsigned long timeout_msec);
781 extern unsigned int ata_dev_try_classify(struct ata_port *, unsigned int, u8 *);
782
783 /*
784 * Default driver ops implementations
785 */
786 extern void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
787 extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
788 extern void ata_tf_to_fis(const struct ata_taskfile *tf,
789 u8 pmp, int is_cmd, u8 *fis);
790 extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
791 extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
792 extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
793 extern u8 ata_check_status(struct ata_port *ap);
794 extern u8 ata_altstatus(struct ata_port *ap);
795 extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf);
796 extern int ata_port_start (struct ata_port *ap);
797 extern int ata_sff_port_start (struct ata_port *ap);
798 extern irqreturn_t ata_interrupt (int irq, void *dev_instance);
799 extern void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
800 unsigned int buflen, int write_data);
801 extern void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
802 unsigned int buflen, int write_data);
803 extern void ata_dumb_qc_prep(struct ata_queued_cmd *qc);
804 extern void ata_qc_prep(struct ata_queued_cmd *qc);
805 extern void ata_noop_qc_prep(struct ata_queued_cmd *qc);
806 extern unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc);
807 extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
808 unsigned int buflen);
809 extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
810 unsigned int n_elem);
811 extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
812 extern void ata_dev_disable(struct ata_device *adev);
813 extern void ata_id_string(const u16 *id, unsigned char *s,
814 unsigned int ofs, unsigned int len);
815 extern void ata_id_c_string(const u16 *id, unsigned char *s,
816 unsigned int ofs, unsigned int len);
817 extern void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown);
818 extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
819 extern void ata_bmdma_start (struct ata_queued_cmd *qc);
820 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
821 extern u8 ata_bmdma_status(struct ata_port *ap);
822 extern void ata_bmdma_irq_clear(struct ata_port *ap);
823 extern void ata_bmdma_freeze(struct ata_port *ap);
824 extern void ata_bmdma_thaw(struct ata_port *ap);
825 extern void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
826 ata_reset_fn_t softreset,
827 ata_reset_fn_t hardreset,
828 ata_postreset_fn_t postreset);
829 extern void ata_bmdma_error_handler(struct ata_port *ap);
830 extern void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc);
831 extern int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
832 u8 status, int in_wq);
833 extern void ata_qc_complete(struct ata_queued_cmd *qc);
834 extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
835 void (*finish_qc)(struct ata_queued_cmd *));
836 extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
837 void (*done)(struct scsi_cmnd *));
838 extern int ata_std_bios_param(struct scsi_device *sdev,
839 struct block_device *bdev,
840 sector_t capacity, int geom[]);
841 extern int ata_scsi_slave_config(struct scsi_device *sdev);
842 extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
843 extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
844 int queue_depth);
845 extern struct ata_device *ata_dev_pair(struct ata_device *adev);
846 extern int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev);
847 extern u8 ata_irq_on(struct ata_port *ap);
848 extern u8 ata_dummy_irq_on(struct ata_port *ap);
849 extern u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq);
850 extern u8 ata_dummy_irq_ack(struct ata_port *ap, unsigned int chk_drq);
851
852 extern int ata_cable_40wire(struct ata_port *ap);
853 extern int ata_cable_80wire(struct ata_port *ap);
854 extern int ata_cable_sata(struct ata_port *ap);
855 extern int ata_cable_unknown(struct ata_port *ap);
856
857 /*
858 * Timing helpers
859 */
860
861 extern unsigned int ata_pio_need_iordy(const struct ata_device *);
862 extern int ata_timing_compute(struct ata_device *, unsigned short,
863 struct ata_timing *, int, int);
864 extern void ata_timing_merge(const struct ata_timing *,
865 const struct ata_timing *, struct ata_timing *,
866 unsigned int);
867
868 enum {
869 ATA_TIMING_SETUP = (1 << 0),
870 ATA_TIMING_ACT8B = (1 << 1),
871 ATA_TIMING_REC8B = (1 << 2),
872 ATA_TIMING_CYC8B = (1 << 3),
873 ATA_TIMING_8BIT = ATA_TIMING_ACT8B | ATA_TIMING_REC8B |
874 ATA_TIMING_CYC8B,
875 ATA_TIMING_ACTIVE = (1 << 4),
876 ATA_TIMING_RECOVER = (1 << 5),
877 ATA_TIMING_CYCLE = (1 << 6),
878 ATA_TIMING_UDMA = (1 << 7),
879 ATA_TIMING_ALL = ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
880 ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
881 ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
882 ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
883 };
884
885
886 #ifdef CONFIG_PCI
887 struct pci_bits {
888 unsigned int reg; /* PCI config register to read */
889 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
890 unsigned long mask;
891 unsigned long val;
892 };
893
894 extern int ata_pci_init_sff_host(struct ata_host *host);
895 extern int ata_pci_init_bmdma(struct ata_host *host);
896 extern int ata_pci_prepare_sff_host(struct pci_dev *pdev,
897 const struct ata_port_info * const * ppi,
898 struct ata_host **r_host);
899 extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);
900 extern unsigned long ata_pci_default_filter(struct ata_device *, unsigned long);
901 #endif /* CONFIG_PCI */
902
903 /*
904 * EH
905 */
906 extern void ata_eng_timeout(struct ata_port *ap);
907
908 extern void ata_port_schedule_eh(struct ata_port *ap);
909 extern int ata_link_abort(struct ata_link *link);
910 extern int ata_port_abort(struct ata_port *ap);
911 extern int ata_port_freeze(struct ata_port *ap);
912
913 extern void ata_eh_freeze_port(struct ata_port *ap);
914 extern void ata_eh_thaw_port(struct ata_port *ap);
915
916 extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
917 extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
918
919 extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
920 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
921 ata_postreset_fn_t postreset);
922
923 /*
924 * printk helpers
925 */
926 #define ata_port_printk(ap, lv, fmt, args...) \
927 printk(lv"ata%u: "fmt, (ap)->print_id , ##args)
928
929 #define ata_link_printk(link, lv, fmt, args...) \
930 printk(lv"ata%u: "fmt, (link)->ap->print_id , ##args)
931
932 #define ata_dev_printk(dev, lv, fmt, args...) \
933 printk(lv"ata%u.%02u: "fmt, (dev)->link->ap->print_id, (dev)->devno , ##args)
934
935 /*
936 * ata_eh_info helpers
937 */
938 extern void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...);
939 extern void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...);
940 extern void ata_ehi_clear_desc(struct ata_eh_info *ehi);
941
942 static inline void ata_ehi_schedule_probe(struct ata_eh_info *ehi)
943 {
944 ehi->flags |= ATA_EHI_RESUME_LINK;
945 ehi->action |= ATA_EH_SOFTRESET;
946 ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
947 }
948
949 static inline void ata_ehi_hotplugged(struct ata_eh_info *ehi)
950 {
951 ata_ehi_schedule_probe(ehi);
952 ehi->flags |= ATA_EHI_HOTPLUGGED;
953 ehi->err_mask |= AC_ERR_ATA_BUS;
954 }
955
956 /*
957 * qc helpers
958 */
959 static inline int
960 ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
961 {
962 if (sg == &qc->pad_sgent)
963 return 1;
964 if (qc->pad_len)
965 return 0;
966 if (((sg - qc->__sg) + 1) == qc->n_elem)
967 return 1;
968 return 0;
969 }
970
971 static inline struct scatterlist *
972 ata_qc_first_sg(struct ata_queued_cmd *qc)
973 {
974 if (qc->n_elem)
975 return qc->__sg;
976 if (qc->pad_len)
977 return &qc->pad_sgent;
978 return NULL;
979 }
980
981 static inline struct scatterlist *
982 ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
983 {
984 if (sg == &qc->pad_sgent)
985 return NULL;
986 if (++sg - qc->__sg < qc->n_elem)
987 return sg;
988 if (qc->pad_len)
989 return &qc->pad_sgent;
990 return NULL;
991 }
992
993 #define ata_for_each_sg(sg, qc) \
994 for (sg = ata_qc_first_sg(qc); sg; sg = ata_qc_next_sg(sg, qc))
995
996 static inline unsigned int ata_tag_valid(unsigned int tag)
997 {
998 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
999 }
1000
1001 static inline unsigned int ata_tag_internal(unsigned int tag)
1002 {
1003 return tag == ATA_MAX_QUEUE - 1;
1004 }
1005
1006 /*
1007 * device helpers
1008 */
1009 static inline unsigned int ata_class_enabled(unsigned int class)
1010 {
1011 return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI;
1012 }
1013
1014 static inline unsigned int ata_class_disabled(unsigned int class)
1015 {
1016 return class == ATA_DEV_ATA_UNSUP || class == ATA_DEV_ATAPI_UNSUP;
1017 }
1018
1019 static inline unsigned int ata_class_absent(unsigned int class)
1020 {
1021 return !ata_class_enabled(class) && !ata_class_disabled(class);
1022 }
1023
1024 static inline unsigned int ata_dev_enabled(const struct ata_device *dev)
1025 {
1026 return ata_class_enabled(dev->class);
1027 }
1028
1029 static inline unsigned int ata_dev_disabled(const struct ata_device *dev)
1030 {
1031 return ata_class_disabled(dev->class);
1032 }
1033
1034 static inline unsigned int ata_dev_absent(const struct ata_device *dev)
1035 {
1036 return ata_class_absent(dev->class);
1037 }
1038
1039 /*
1040 * link helpers
1041 */
1042 static inline int ata_link_max_devices(const struct ata_link *link)
1043 {
1044 if (link->ap->flags & ATA_FLAG_SLAVE_POSS)
1045 return 2;
1046 return 1;
1047 }
1048
1049 #define ata_port_for_each_link(lk, ap) \
1050 for ((lk) = &(ap)->link; (lk); (lk) = NULL)
1051
1052 #define ata_link_for_each_dev(dev, link) \
1053 for ((dev) = (link)->device; \
1054 (dev) < (link)->device + ata_link_max_devices(link) || ((dev) = NULL); \
1055 (dev)++)
1056
1057 #define ata_link_for_each_dev_reverse(dev, link) \
1058 for ((dev) = (link)->device + ata_link_max_devices(link) - 1; \
1059 (dev) >= (link)->device || ((dev) = NULL); (dev)--)
1060
1061 static inline u8 ata_chk_status(struct ata_port *ap)
1062 {
1063 return ap->ops->check_status(ap);
1064 }
1065
1066 /**
1067 * ata_ncq_enabled - Test whether NCQ is enabled
1068 * @dev: ATA device to test for
1069 *
1070 * LOCKING:
1071 * spin_lock_irqsave(host lock)
1072 *
1073 * RETURNS:
1074 * 1 if NCQ is enabled for @dev, 0 otherwise.
1075 */
1076 static inline int ata_ncq_enabled(struct ata_device *dev)
1077 {
1078 return (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
1079 ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ;
1080 }
1081
1082 /**
1083 * ata_pause - Flush writes and pause 400 nanoseconds.
1084 * @ap: Port to wait for.
1085 *
1086 * LOCKING:
1087 * Inherited from caller.
1088 */
1089
1090 static inline void ata_pause(struct ata_port *ap)
1091 {
1092 ata_altstatus(ap);
1093 ndelay(400);
1094 }
1095
1096
1097 /**
1098 * ata_busy_wait - Wait for a port status register
1099 * @ap: Port to wait for.
1100 * @bits: bits that must be clear
1101 * @max: number of 10uS waits to perform
1102 *
1103 * Waits up to max*10 microseconds for the selected bits in the port's
1104 * status register to be cleared.
1105 * Returns final value of status register.
1106 *
1107 * LOCKING:
1108 * Inherited from caller.
1109 */
1110
1111 static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
1112 unsigned int max)
1113 {
1114 u8 status;
1115
1116 do {
1117 udelay(10);
1118 status = ata_chk_status(ap);
1119 max--;
1120 } while (status != 0xff && (status & bits) && (max > 0));
1121
1122 return status;
1123 }
1124
1125
1126 /**
1127 * ata_wait_idle - Wait for a port to be idle.
1128 * @ap: Port to wait for.
1129 *
1130 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
1131 * Returns final value of status register.
1132 *
1133 * LOCKING:
1134 * Inherited from caller.
1135 */
1136
1137 static inline u8 ata_wait_idle(struct ata_port *ap)
1138 {
1139 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
1140
1141 if (status != 0xff && (status & (ATA_BUSY | ATA_DRQ)))
1142 DPRINTK("ATA: abnormal status 0x%X on port 0x%p\n",
1143 status, ap->ioaddr.status_addr);
1144
1145 return status;
1146 }
1147
1148 static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
1149 {
1150 qc->tf.ctl |= ATA_NIEN;
1151 }
1152
1153 static inline struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
1154 unsigned int tag)
1155 {
1156 if (likely(ata_tag_valid(tag)))
1157 return &ap->qcmd[tag];
1158 return NULL;
1159 }
1160
1161 static inline struct ata_queued_cmd *ata_qc_from_tag(struct ata_port *ap,
1162 unsigned int tag)
1163 {
1164 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
1165
1166 if (unlikely(!qc) || !ap->ops->error_handler)
1167 return qc;
1168
1169 if ((qc->flags & (ATA_QCFLAG_ACTIVE |
1170 ATA_QCFLAG_FAILED)) == ATA_QCFLAG_ACTIVE)
1171 return qc;
1172
1173 return NULL;
1174 }
1175
1176 static inline void ata_tf_init(struct ata_device *dev, struct ata_taskfile *tf)
1177 {
1178 memset(tf, 0, sizeof(*tf));
1179
1180 tf->ctl = dev->link->ap->ctl;
1181 if (dev->devno == 0)
1182 tf->device = ATA_DEVICE_OBS;
1183 else
1184 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
1185 }
1186
1187 static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
1188 {
1189 qc->dma_dir = DMA_NONE;
1190 qc->__sg = NULL;
1191 qc->flags = 0;
1192 qc->cursg = qc->cursg_ofs = 0;
1193 qc->nbytes = qc->curbytes = 0;
1194 qc->n_elem = 0;
1195 qc->err_mask = 0;
1196 qc->pad_len = 0;
1197 qc->sect_size = ATA_SECT_SIZE;
1198
1199 ata_tf_init(qc->dev, &qc->tf);
1200
1201 /* init result_tf such that it indicates normal completion */
1202 qc->result_tf.command = ATA_DRDY;
1203 qc->result_tf.feature = 0;
1204 }
1205
1206 static inline int ata_try_flush_cache(const struct ata_device *dev)
1207 {
1208 return ata_id_wcache_enabled(dev->id) ||
1209 ata_id_has_flush(dev->id) ||
1210 ata_id_has_flush_ext(dev->id);
1211 }
1212
1213 static inline unsigned int ac_err_mask(u8 status)
1214 {
1215 if (status & (ATA_BUSY | ATA_DRQ))
1216 return AC_ERR_HSM;
1217 if (status & (ATA_ERR | ATA_DF))
1218 return AC_ERR_DEV;
1219 return 0;
1220 }
1221
1222 static inline unsigned int __ac_err_mask(u8 status)
1223 {
1224 unsigned int mask = ac_err_mask(status);
1225 if (mask == 0)
1226 return AC_ERR_OTHER;
1227 return mask;
1228 }
1229
1230 static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev)
1231 {
1232 ap->pad_dma = 0;
1233 ap->pad = dmam_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ,
1234 &ap->pad_dma, GFP_KERNEL);
1235 return (ap->pad == NULL) ? -ENOMEM : 0;
1236 }
1237
1238 static inline void ata_pad_free(struct ata_port *ap, struct device *dev)
1239 {
1240 dmam_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
1241 }
1242
1243 static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
1244 {
1245 return *(struct ata_port **)&host->hostdata[0];
1246 }
1247
1248 #endif /* __LINUX_LIBATA_H__ */
Linux kernel - Deliverables
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