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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 <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
39 /*
40 * Define if arch has non-standard setup. This is a _PCI_ standard
41 * not a legacy or ISA standard.
42 */
43 #ifdef CONFIG_ATA_NONSTANDARD
44 #include <asm/libata-portmap.h>
45 #else
46 #include <asm-generic/libata-portmap.h>
47 #endif
48
49 /*
50 * compile-time options: to be removed as soon as all the drivers are
51 * converted to the new debugging mechanism
52 */
53 #undef ATA_DEBUG /* debugging output */
54 #undef ATA_VERBOSE_DEBUG /* yet more debugging output */
55 #undef ATA_IRQ_TRAP /* define to ack screaming irqs */
56 #undef ATA_NDEBUG /* define to disable quick runtime checks */
57
58
59 /* note: prints function name for you */
60 #ifdef ATA_DEBUG
61 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
62 #ifdef ATA_VERBOSE_DEBUG
63 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
64 #else
65 #define VPRINTK(fmt, args...)
66 #endif /* ATA_VERBOSE_DEBUG */
67 #else
68 #define DPRINTK(fmt, args...)
69 #define VPRINTK(fmt, args...)
70 #endif /* ATA_DEBUG */
71
72 #define BPRINTK(fmt, args...) if (ap->flags & ATA_FLAG_DEBUGMSG) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
73
74 /* NEW: debug levels */
75 #define HAVE_LIBATA_MSG 1
76
77 enum {
78 ATA_MSG_DRV = 0x0001,
79 ATA_MSG_INFO = 0x0002,
80 ATA_MSG_PROBE = 0x0004,
81 ATA_MSG_WARN = 0x0008,
82 ATA_MSG_MALLOC = 0x0010,
83 ATA_MSG_CTL = 0x0020,
84 ATA_MSG_INTR = 0x0040,
85 ATA_MSG_ERR = 0x0080,
86 };
87
88 #define ata_msg_drv(p) ((p)->msg_enable & ATA_MSG_DRV)
89 #define ata_msg_info(p) ((p)->msg_enable & ATA_MSG_INFO)
90 #define ata_msg_probe(p) ((p)->msg_enable & ATA_MSG_PROBE)
91 #define ata_msg_warn(p) ((p)->msg_enable & ATA_MSG_WARN)
92 #define ata_msg_malloc(p) ((p)->msg_enable & ATA_MSG_MALLOC)
93 #define ata_msg_ctl(p) ((p)->msg_enable & ATA_MSG_CTL)
94 #define ata_msg_intr(p) ((p)->msg_enable & ATA_MSG_INTR)
95 #define ata_msg_err(p) ((p)->msg_enable & ATA_MSG_ERR)
96
97 static inline u32 ata_msg_init(int dval, int default_msg_enable_bits)
98 {
99 if (dval < 0 || dval >= (sizeof(u32) * 8))
100 return default_msg_enable_bits; /* should be 0x1 - only driver info msgs */
101 if (!dval)
102 return 0;
103 return (1 << dval) - 1;
104 }
105
106 /* defines only for the constants which don't work well as enums */
107 #define ATA_TAG_POISON 0xfafbfcfdU
108
109 /* move to PCI layer? */
110 static inline struct device *pci_dev_to_dev(struct pci_dev *pdev)
111 {
112 return &pdev->dev;
113 }
114
115 enum {
116 /* various global constants */
117 LIBATA_MAX_PRD = ATA_MAX_PRD / 2,
118 ATA_MAX_PORTS = 8,
119 ATA_DEF_QUEUE = 1,
120 /* tag ATA_MAX_QUEUE - 1 is reserved for internal commands */
121 ATA_MAX_QUEUE = 32,
122 ATA_TAG_INTERNAL = ATA_MAX_QUEUE - 1,
123 ATA_MAX_BUS = 2,
124 ATA_DEF_BUSY_WAIT = 10000,
125 ATA_SHORT_PAUSE = (HZ >> 6) + 1,
126
127 ATA_SHT_EMULATED = 1,
128 ATA_SHT_CMD_PER_LUN = 1,
129 ATA_SHT_THIS_ID = -1,
130 ATA_SHT_USE_CLUSTERING = 1,
131
132 /* struct ata_device stuff */
133 ATA_DFLAG_LBA = (1 << 0), /* device supports LBA */
134 ATA_DFLAG_LBA48 = (1 << 1), /* device supports LBA48 */
135 ATA_DFLAG_CDB_INTR = (1 << 2), /* device asserts INTRQ when ready for CDB */
136 ATA_DFLAG_NCQ = (1 << 3), /* device supports NCQ */
137 ATA_DFLAG_FLUSH_EXT = (1 << 4), /* do FLUSH_EXT instead of FLUSH */
138 ATA_DFLAG_CFG_MASK = (1 << 8) - 1,
139
140 ATA_DFLAG_PIO = (1 << 8), /* device limited to PIO mode */
141 ATA_DFLAG_NCQ_OFF = (1 << 9), /* device limited to non-NCQ mode */
142 ATA_DFLAG_SUSPENDED = (1 << 10), /* device suspended */
143 ATA_DFLAG_INIT_MASK = (1 << 16) - 1,
144
145 ATA_DFLAG_DETACH = (1 << 16),
146 ATA_DFLAG_DETACHED = (1 << 17),
147
148 ATA_DEV_UNKNOWN = 0, /* unknown device */
149 ATA_DEV_ATA = 1, /* ATA device */
150 ATA_DEV_ATA_UNSUP = 2, /* ATA device (unsupported) */
151 ATA_DEV_ATAPI = 3, /* ATAPI device */
152 ATA_DEV_ATAPI_UNSUP = 4, /* ATAPI device (unsupported) */
153 ATA_DEV_NONE = 5, /* no device */
154
155 /* struct ata_port flags */
156 ATA_FLAG_SLAVE_POSS = (1 << 0), /* host supports slave dev */
157 /* (doesn't imply presence) */
158 ATA_FLAG_SATA = (1 << 1),
159 ATA_FLAG_NO_LEGACY = (1 << 2), /* no legacy mode check */
160 ATA_FLAG_MMIO = (1 << 3), /* use MMIO, not PIO */
161 ATA_FLAG_SRST = (1 << 4), /* (obsolete) use ATA SRST, not E.D.D. */
162 ATA_FLAG_SATA_RESET = (1 << 5), /* (obsolete) use COMRESET */
163 ATA_FLAG_NO_ATAPI = (1 << 6), /* No ATAPI support */
164 ATA_FLAG_PIO_DMA = (1 << 7), /* PIO cmds via DMA */
165 ATA_FLAG_PIO_LBA48 = (1 << 8), /* Host DMA engine is LBA28 only */
166 ATA_FLAG_PIO_POLLING = (1 << 9), /* use polling PIO if LLD
167 * doesn't handle PIO interrupts */
168 ATA_FLAG_NCQ = (1 << 10), /* host supports NCQ */
169 ATA_FLAG_HRST_TO_RESUME = (1 << 11), /* hardreset to resume phy */
170 ATA_FLAG_SKIP_D2H_BSY = (1 << 12), /* can't wait for the first D2H
171 * Register FIS clearing BSY */
172 ATA_FLAG_DEBUGMSG = (1 << 13),
173 ATA_FLAG_SETXFER_POLLING= (1 << 14), /* use polling for SETXFER */
174 ATA_FLAG_IGN_SIMPLEX = (1 << 15), /* ignore SIMPLEX */
175 ATA_FLAG_NO_IORDY = (1 << 16), /* controller lacks iordy */
176
177 /* The following flag belongs to ap->pflags but is kept in
178 * ap->flags because it's referenced in many LLDs and will be
179 * removed in not-too-distant future.
180 */
181 ATA_FLAG_DISABLED = (1 << 23), /* port is disabled, ignore it */
182
183 /* bits 24:31 of ap->flags are reserved for LLD specific flags */
184
185 /* struct ata_port pflags */
186 ATA_PFLAG_EH_PENDING = (1 << 0), /* EH pending */
187 ATA_PFLAG_EH_IN_PROGRESS = (1 << 1), /* EH in progress */
188 ATA_PFLAG_FROZEN = (1 << 2), /* port is frozen */
189 ATA_PFLAG_RECOVERED = (1 << 3), /* recovery action performed */
190 ATA_PFLAG_LOADING = (1 << 4), /* boot/loading probe */
191 ATA_PFLAG_UNLOADING = (1 << 5), /* module is unloading */
192 ATA_PFLAG_SCSI_HOTPLUG = (1 << 6), /* SCSI hotplug scheduled */
193
194 ATA_PFLAG_FLUSH_PORT_TASK = (1 << 16), /* flush port task */
195 ATA_PFLAG_SUSPENDED = (1 << 17), /* port is suspended (power) */
196 ATA_PFLAG_PM_PENDING = (1 << 18), /* PM operation pending */
197
198 /* struct ata_queued_cmd flags */
199 ATA_QCFLAG_ACTIVE = (1 << 0), /* cmd not yet ack'd to scsi lyer */
200 ATA_QCFLAG_SG = (1 << 1), /* have s/g table? */
201 ATA_QCFLAG_SINGLE = (1 << 2), /* no s/g, just a single buffer */
202 ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
203 ATA_QCFLAG_IO = (1 << 3), /* standard IO command */
204 ATA_QCFLAG_RESULT_TF = (1 << 4), /* result TF requested */
205
206 ATA_QCFLAG_FAILED = (1 << 16), /* cmd failed and is owned by EH */
207 ATA_QCFLAG_SENSE_VALID = (1 << 17), /* sense data valid */
208 ATA_QCFLAG_EH_SCHEDULED = (1 << 18), /* EH scheduled (obsolete) */
209
210 /* host set flags */
211 ATA_HOST_SIMPLEX = (1 << 0), /* Host is simplex, one DMA channel per host only */
212
213 /* various lengths of time */
214 ATA_TMOUT_BOOT = 30 * HZ, /* heuristic */
215 ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* heuristic */
216 ATA_TMOUT_INTERNAL = 30 * HZ,
217 ATA_TMOUT_INTERNAL_QUICK = 5 * HZ,
218
219 /* ATA bus states */
220 BUS_UNKNOWN = 0,
221 BUS_DMA = 1,
222 BUS_IDLE = 2,
223 BUS_NOINTR = 3,
224 BUS_NODATA = 4,
225 BUS_TIMER = 5,
226 BUS_PIO = 6,
227 BUS_EDD = 7,
228 BUS_IDENTIFY = 8,
229 BUS_PACKET = 9,
230
231 /* SATA port states */
232 PORT_UNKNOWN = 0,
233 PORT_ENABLED = 1,
234 PORT_DISABLED = 2,
235
236 /* encoding various smaller bitmaps into a single
237 * unsigned int bitmap
238 */
239 ATA_BITS_PIO = 7,
240 ATA_BITS_MWDMA = 5,
241 ATA_BITS_UDMA = 8,
242
243 ATA_SHIFT_PIO = 0,
244 ATA_SHIFT_MWDMA = ATA_SHIFT_PIO + ATA_BITS_PIO,
245 ATA_SHIFT_UDMA = ATA_SHIFT_MWDMA + ATA_BITS_MWDMA,
246
247 ATA_MASK_PIO = ((1 << ATA_BITS_PIO) - 1) << ATA_SHIFT_PIO,
248 ATA_MASK_MWDMA = ((1 << ATA_BITS_MWDMA) - 1) << ATA_SHIFT_MWDMA,
249 ATA_MASK_UDMA = ((1 << ATA_BITS_UDMA) - 1) << ATA_SHIFT_UDMA,
250
251 /* size of buffer to pad xfers ending on unaligned boundaries */
252 ATA_DMA_PAD_SZ = 4,
253 ATA_DMA_PAD_BUF_SZ = ATA_DMA_PAD_SZ * ATA_MAX_QUEUE,
254
255 /* masks for port functions */
256 ATA_PORT_PRIMARY = (1 << 0),
257 ATA_PORT_SECONDARY = (1 << 1),
258
259 /* ering size */
260 ATA_ERING_SIZE = 32,
261
262 /* desc_len for ata_eh_info and context */
263 ATA_EH_DESC_LEN = 80,
264
265 /* reset / recovery action types */
266 ATA_EH_REVALIDATE = (1 << 0),
267 ATA_EH_SOFTRESET = (1 << 1),
268 ATA_EH_HARDRESET = (1 << 2),
269 ATA_EH_SUSPEND = (1 << 3),
270 ATA_EH_RESUME = (1 << 4),
271 ATA_EH_PM_FREEZE = (1 << 5),
272
273 ATA_EH_RESET_MASK = ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
274 ATA_EH_PERDEV_MASK = ATA_EH_REVALIDATE | ATA_EH_SUSPEND |
275 ATA_EH_RESUME | ATA_EH_PM_FREEZE,
276
277 /* ata_eh_info->flags */
278 ATA_EHI_HOTPLUGGED = (1 << 0), /* could have been hotplugged */
279 ATA_EHI_RESUME_LINK = (1 << 1), /* resume link (reset modifier) */
280 ATA_EHI_NO_AUTOPSY = (1 << 2), /* no autopsy */
281 ATA_EHI_QUIET = (1 << 3), /* be quiet */
282
283 ATA_EHI_DID_RESET = (1 << 16), /* already reset this port */
284 ATA_EHI_PRINTINFO = (1 << 17), /* print configuration info */
285 ATA_EHI_SETMODE = (1 << 18), /* configure transfer mode */
286 ATA_EHI_POST_SETMODE = (1 << 19), /* revaildating after setmode */
287
288 ATA_EHI_RESET_MODIFIER_MASK = ATA_EHI_RESUME_LINK,
289
290 /* max repeat if error condition is still set after ->error_handler */
291 ATA_EH_MAX_REPEAT = 5,
292
293 /* how hard are we gonna try to probe/recover devices */
294 ATA_PROBE_MAX_TRIES = 3,
295 ATA_EH_RESET_TRIES = 3,
296 ATA_EH_DEV_TRIES = 3,
297
298 /* Drive spinup time (time from power-on to the first D2H FIS)
299 * in msecs - 8s currently. Failing to get ready in this time
300 * isn't critical. It will result in reset failure for
301 * controllers which can't wait for the first D2H FIS. libata
302 * will retry, so it just has to be long enough to spin up
303 * most devices.
304 */
305 ATA_SPINUP_WAIT = 8000,
306
307 /* Horkage types. May be set by libata or controller on drives
308 (some horkage may be drive/controller pair dependant */
309
310 ATA_HORKAGE_DIAGNOSTIC = (1 << 0), /* Failed boot diag */
311 ATA_HORKAGE_NODMA = (1 << 1), /* DMA problems */
312 ATA_HORKAGE_NONCQ = (1 << 2), /* Don't use NCQ */
313 };
314
315 enum hsm_task_states {
316 HSM_ST_IDLE, /* no command on going */
317 HSM_ST, /* (waiting the device to) transfer data */
318 HSM_ST_LAST, /* (waiting the device to) complete command */
319 HSM_ST_ERR, /* error */
320 HSM_ST_FIRST, /* (waiting the device to)
321 write CDB or first data block */
322 };
323
324 enum ata_completion_errors {
325 AC_ERR_DEV = (1 << 0), /* device reported error */
326 AC_ERR_HSM = (1 << 1), /* host state machine violation */
327 AC_ERR_TIMEOUT = (1 << 2), /* timeout */
328 AC_ERR_MEDIA = (1 << 3), /* media error */
329 AC_ERR_ATA_BUS = (1 << 4), /* ATA bus error */
330 AC_ERR_HOST_BUS = (1 << 5), /* host bus error */
331 AC_ERR_SYSTEM = (1 << 6), /* system error */
332 AC_ERR_INVALID = (1 << 7), /* invalid argument */
333 AC_ERR_OTHER = (1 << 8), /* unknown */
334 AC_ERR_NODEV_HINT = (1 << 9), /* polling device detection hint */
335 };
336
337 /* forward declarations */
338 struct scsi_device;
339 struct ata_port_operations;
340 struct ata_port;
341 struct ata_queued_cmd;
342
343 /* typedefs */
344 typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
345 typedef int (*ata_prereset_fn_t)(struct ata_port *ap);
346 typedef int (*ata_reset_fn_t)(struct ata_port *ap, unsigned int *classes);
347 typedef void (*ata_postreset_fn_t)(struct ata_port *ap, unsigned int *classes);
348
349 struct ata_ioports {
350 void __iomem *cmd_addr;
351 void __iomem *data_addr;
352 void __iomem *error_addr;
353 void __iomem *feature_addr;
354 void __iomem *nsect_addr;
355 void __iomem *lbal_addr;
356 void __iomem *lbam_addr;
357 void __iomem *lbah_addr;
358 void __iomem *device_addr;
359 void __iomem *status_addr;
360 void __iomem *command_addr;
361 void __iomem *altstatus_addr;
362 void __iomem *ctl_addr;
363 void __iomem *bmdma_addr;
364 void __iomem *scr_addr;
365 };
366
367 struct ata_probe_ent {
368 struct list_head node;
369 struct device *dev;
370 const struct ata_port_operations *port_ops;
371 struct scsi_host_template *sht;
372 struct ata_ioports port[ATA_MAX_PORTS];
373 unsigned int n_ports;
374 unsigned int dummy_port_mask;
375 unsigned int pio_mask;
376 unsigned int mwdma_mask;
377 unsigned int udma_mask;
378 unsigned long irq;
379 unsigned long irq2;
380 unsigned int irq_flags;
381 unsigned long port_flags;
382 unsigned long _host_flags;
383 void __iomem * const *iomap;
384 void *private_data;
385
386 /* port_info for the secondary port. Together with irq2, it's
387 * used to implement non-uniform secondary port. Currently,
388 * the only user is ata_piix combined mode. This workaround
389 * will be removed together with ata_probe_ent when init model
390 * is updated.
391 */
392 const struct ata_port_info *pinfo2;
393 };
394
395 struct ata_host {
396 spinlock_t lock;
397 struct device *dev;
398 unsigned long irq;
399 unsigned long irq2;
400 void __iomem * const *iomap;
401 unsigned int n_ports;
402 void *private_data;
403 const struct ata_port_operations *ops;
404 unsigned long flags;
405 int simplex_claimed; /* Keep seperate in case we
406 ever need to do this locked */
407 struct ata_port *ports[0];
408 };
409
410 struct ata_queued_cmd {
411 struct ata_port *ap;
412 struct ata_device *dev;
413
414 struct scsi_cmnd *scsicmd;
415 void (*scsidone)(struct scsi_cmnd *);
416
417 struct ata_taskfile tf;
418 u8 cdb[ATAPI_CDB_LEN];
419
420 unsigned long flags; /* ATA_QCFLAG_xxx */
421 unsigned int tag;
422 unsigned int n_elem;
423 unsigned int orig_n_elem;
424
425 int dma_dir;
426
427 unsigned int pad_len;
428
429 unsigned int nbytes;
430 unsigned int curbytes;
431
432 unsigned int cursg;
433 unsigned int cursg_ofs;
434
435 struct scatterlist sgent;
436 struct scatterlist pad_sgent;
437 void *buf_virt;
438
439 /* DO NOT iterate over __sg manually, use ata_for_each_sg() */
440 struct scatterlist *__sg;
441
442 unsigned int err_mask;
443 struct ata_taskfile result_tf;
444 ata_qc_cb_t complete_fn;
445
446 void *private_data;
447 };
448
449 struct ata_port_stats {
450 unsigned long unhandled_irq;
451 unsigned long idle_irq;
452 unsigned long rw_reqbuf;
453 };
454
455 struct ata_ering_entry {
456 int is_io;
457 unsigned int err_mask;
458 u64 timestamp;
459 };
460
461 struct ata_ering {
462 int cursor;
463 struct ata_ering_entry ring[ATA_ERING_SIZE];
464 };
465
466 struct ata_device {
467 struct ata_port *ap;
468 unsigned int devno; /* 0 or 1 */
469 unsigned long flags; /* ATA_DFLAG_xxx */
470 struct scsi_device *sdev; /* attached SCSI device */
471 /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
472 u64 n_sectors; /* size of device, if ATA */
473 unsigned int class; /* ATA_DEV_xxx */
474 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
475 u8 pio_mode;
476 u8 dma_mode;
477 u8 xfer_mode;
478 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
479
480 unsigned int multi_count; /* sectors count for
481 READ/WRITE MULTIPLE */
482 unsigned int max_sectors; /* per-device max sectors */
483 unsigned int cdb_len;
484
485 /* per-dev xfer mask */
486 unsigned int pio_mask;
487 unsigned int mwdma_mask;
488 unsigned int udma_mask;
489
490 /* for CHS addressing */
491 u16 cylinders; /* Number of cylinders */
492 u16 heads; /* Number of heads */
493 u16 sectors; /* Number of sectors per track */
494
495 /* error history */
496 struct ata_ering ering;
497 unsigned int horkage; /* List of broken features */
498 };
499
500 /* Offset into struct ata_device. Fields above it are maintained
501 * acress device init. Fields below are zeroed.
502 */
503 #define ATA_DEVICE_CLEAR_OFFSET offsetof(struct ata_device, n_sectors)
504
505 struct ata_eh_info {
506 struct ata_device *dev; /* offending device */
507 u32 serror; /* SError from LLDD */
508 unsigned int err_mask; /* port-wide err_mask */
509 unsigned int action; /* ATA_EH_* action mask */
510 unsigned int dev_action[ATA_MAX_DEVICES]; /* dev EH action */
511 unsigned int flags; /* ATA_EHI_* flags */
512
513 unsigned long hotplug_timestamp;
514 unsigned int probe_mask;
515
516 char desc[ATA_EH_DESC_LEN];
517 int desc_len;
518 };
519
520 struct ata_eh_context {
521 struct ata_eh_info i;
522 int tries[ATA_MAX_DEVICES];
523 unsigned int classes[ATA_MAX_DEVICES];
524 unsigned int did_probe_mask;
525 };
526
527 struct ata_port {
528 struct Scsi_Host *scsi_host; /* our co-allocated scsi host */
529 const struct ata_port_operations *ops;
530 spinlock_t *lock;
531 unsigned long flags; /* ATA_FLAG_xxx */
532 unsigned int pflags; /* ATA_PFLAG_xxx */
533 unsigned int id; /* unique id req'd by scsi midlyr */
534 unsigned int port_no; /* unique port #; from zero */
535
536 struct ata_prd *prd; /* our SG list */
537 dma_addr_t prd_dma; /* and its DMA mapping */
538
539 void *pad; /* array of DMA pad buffers */
540 dma_addr_t pad_dma;
541
542 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
543
544 u8 ctl; /* cache of ATA control register */
545 u8 last_ctl; /* Cache last written value */
546 unsigned int pio_mask;
547 unsigned int mwdma_mask;
548 unsigned int udma_mask;
549 unsigned int cbl; /* cable type; ATA_CBL_xxx */
550 unsigned int hw_sata_spd_limit;
551 unsigned int sata_spd_limit; /* SATA PHY speed limit */
552
553 /* record runtime error info, protected by host lock */
554 struct ata_eh_info eh_info;
555 /* EH context owned by EH */
556 struct ata_eh_context eh_context;
557
558 struct ata_device device[ATA_MAX_DEVICES];
559
560 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
561 unsigned long qc_allocated;
562 unsigned int qc_active;
563
564 unsigned int active_tag;
565 u32 sactive;
566
567 struct ata_port_stats stats;
568 struct ata_host *host;
569 struct device *dev;
570
571 void *port_task_data;
572 struct delayed_work port_task;
573 struct delayed_work hotplug_task;
574 struct work_struct scsi_rescan_task;
575
576 unsigned int hsm_task_state;
577
578 u32 msg_enable;
579 struct list_head eh_done_q;
580 wait_queue_head_t eh_wait_q;
581
582 pm_message_t pm_mesg;
583 int *pm_result;
584
585 void *private_data;
586
587 u8 sector_buf[ATA_SECT_SIZE]; /* owned by EH */
588 };
589
590 struct ata_port_operations {
591 void (*port_disable) (struct ata_port *);
592
593 void (*dev_config) (struct ata_port *, struct ata_device *);
594
595 void (*set_piomode) (struct ata_port *, struct ata_device *);
596 void (*set_dmamode) (struct ata_port *, struct ata_device *);
597 unsigned long (*mode_filter) (const struct ata_port *, struct ata_device *, unsigned long);
598
599 void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
600 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
601
602 void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
603 u8 (*check_status)(struct ata_port *ap);
604 u8 (*check_altstatus)(struct ata_port *ap);
605 void (*dev_select)(struct ata_port *ap, unsigned int device);
606
607 void (*phy_reset) (struct ata_port *ap); /* obsolete */
608 int (*set_mode) (struct ata_port *ap, struct ata_device **r_failed_dev);
609
610 void (*post_set_mode) (struct ata_port *ap);
611
612 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
613
614 void (*bmdma_setup) (struct ata_queued_cmd *qc);
615 void (*bmdma_start) (struct ata_queued_cmd *qc);
616
617 void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
618
619 void (*qc_prep) (struct ata_queued_cmd *qc);
620 unsigned int (*qc_issue) (struct ata_queued_cmd *qc);
621
622 /* Error handlers. ->error_handler overrides ->eng_timeout and
623 * indicates that new-style EH is in place.
624 */
625 void (*eng_timeout) (struct ata_port *ap); /* obsolete */
626
627 void (*freeze) (struct ata_port *ap);
628 void (*thaw) (struct ata_port *ap);
629 void (*error_handler) (struct ata_port *ap);
630 void (*post_internal_cmd) (struct ata_queued_cmd *qc);
631
632 irq_handler_t irq_handler;
633 void (*irq_clear) (struct ata_port *);
634 u8 (*irq_on) (struct ata_port *);
635 u8 (*irq_ack) (struct ata_port *ap, unsigned int chk_drq);
636
637 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
638 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
639 u32 val);
640
641 int (*port_suspend) (struct ata_port *ap, pm_message_t mesg);
642 int (*port_resume) (struct ata_port *ap);
643
644 int (*port_start) (struct ata_port *ap);
645 void (*port_stop) (struct ata_port *ap);
646
647 void (*host_stop) (struct ata_host *host);
648
649 void (*bmdma_stop) (struct ata_queued_cmd *qc);
650 u8 (*bmdma_status) (struct ata_port *ap);
651 };
652
653 struct ata_port_info {
654 struct scsi_host_template *sht;
655 unsigned long flags;
656 unsigned long pio_mask;
657 unsigned long mwdma_mask;
658 unsigned long udma_mask;
659 const struct ata_port_operations *port_ops;
660 void *private_data;
661 };
662
663 struct ata_timing {
664 unsigned short mode; /* ATA mode */
665 unsigned short setup; /* t1 */
666 unsigned short act8b; /* t2 for 8-bit I/O */
667 unsigned short rec8b; /* t2i for 8-bit I/O */
668 unsigned short cyc8b; /* t0 for 8-bit I/O */
669 unsigned short active; /* t2 or tD */
670 unsigned short recover; /* t2i or tK */
671 unsigned short cycle; /* t0 */
672 unsigned short udma; /* t2CYCTYP/2 */
673 };
674
675 #define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
676
677 extern const unsigned long sata_deb_timing_normal[];
678 extern const unsigned long sata_deb_timing_hotplug[];
679 extern const unsigned long sata_deb_timing_long[];
680
681 extern const struct ata_port_operations ata_dummy_port_ops;
682
683 static inline const unsigned long *
684 sata_ehc_deb_timing(struct ata_eh_context *ehc)
685 {
686 if (ehc->i.flags & ATA_EHI_HOTPLUGGED)
687 return sata_deb_timing_hotplug;
688 else
689 return sata_deb_timing_normal;
690 }
691
692 static inline int ata_port_is_dummy(struct ata_port *ap)
693 {
694 return ap->ops == &ata_dummy_port_ops;
695 }
696
697 extern void ata_port_probe(struct ata_port *);
698 extern void __sata_phy_reset(struct ata_port *ap);
699 extern void sata_phy_reset(struct ata_port *ap);
700 extern void ata_bus_reset(struct ata_port *ap);
701 extern int sata_set_spd(struct ata_port *ap);
702 extern int sata_phy_debounce(struct ata_port *ap, const unsigned long *param);
703 extern int sata_phy_resume(struct ata_port *ap, const unsigned long *param);
704 extern int ata_std_prereset(struct ata_port *ap);
705 extern int ata_std_softreset(struct ata_port *ap, unsigned int *classes);
706 extern int sata_port_hardreset(struct ata_port *ap,
707 const unsigned long *timing);
708 extern int sata_std_hardreset(struct ata_port *ap, unsigned int *class);
709 extern void ata_std_postreset(struct ata_port *ap, unsigned int *classes);
710 extern void ata_port_disable(struct ata_port *);
711 extern void ata_std_ports(struct ata_ioports *ioaddr);
712 #ifdef CONFIG_PCI
713 extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
714 unsigned int n_ports);
715 extern void ata_pci_remove_one (struct pci_dev *pdev);
716 extern void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg);
717 extern int __must_check ata_pci_device_do_resume(struct pci_dev *pdev);
718 extern int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
719 extern int ata_pci_device_resume(struct pci_dev *pdev);
720 extern int ata_pci_clear_simplex(struct pci_dev *pdev);
721 #endif /* CONFIG_PCI */
722 extern int ata_device_add(const struct ata_probe_ent *ent);
723 extern void ata_host_detach(struct ata_host *host);
724 extern void ata_host_init(struct ata_host *, struct device *,
725 unsigned long, const struct ata_port_operations *);
726 extern int ata_scsi_detect(struct scsi_host_template *sht);
727 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
728 extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
729 extern void ata_sas_port_destroy(struct ata_port *);
730 extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
731 struct ata_port_info *, struct Scsi_Host *);
732 extern int ata_sas_port_init(struct ata_port *);
733 extern int ata_sas_port_start(struct ata_port *ap);
734 extern void ata_sas_port_stop(struct ata_port *ap);
735 extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
736 extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
737 struct ata_port *ap);
738 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
739 extern int sata_scr_valid(struct ata_port *ap);
740 extern int sata_scr_read(struct ata_port *ap, int reg, u32 *val);
741 extern int sata_scr_write(struct ata_port *ap, int reg, u32 val);
742 extern int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val);
743 extern int ata_port_online(struct ata_port *ap);
744 extern int ata_port_offline(struct ata_port *ap);
745 extern int ata_scsi_device_resume(struct scsi_device *);
746 extern int ata_scsi_device_suspend(struct scsi_device *, pm_message_t mesg);
747 extern int ata_host_suspend(struct ata_host *host, pm_message_t mesg);
748 extern void ata_host_resume(struct ata_host *host);
749 extern int ata_ratelimit(void);
750 extern int ata_busy_sleep(struct ata_port *ap,
751 unsigned long timeout_pat, unsigned long timeout);
752 extern void ata_port_queue_task(struct ata_port *ap, work_func_t fn,
753 void *data, unsigned long delay);
754 extern u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
755 unsigned long interval_msec,
756 unsigned long timeout_msec);
757
758 /*
759 * Default driver ops implementations
760 */
761 extern void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
762 extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
763 extern void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp);
764 extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
765 extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
766 extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
767 extern u8 ata_check_status(struct ata_port *ap);
768 extern u8 ata_altstatus(struct ata_port *ap);
769 extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf);
770 extern int ata_port_start (struct ata_port *ap);
771 extern irqreturn_t ata_interrupt (int irq, void *dev_instance);
772 extern void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
773 unsigned int buflen, int write_data);
774 extern void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
775 unsigned int buflen, int write_data);
776 extern void ata_qc_prep(struct ata_queued_cmd *qc);
777 extern void ata_noop_qc_prep(struct ata_queued_cmd *qc);
778 extern unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc);
779 extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
780 unsigned int buflen);
781 extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
782 unsigned int n_elem);
783 extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
784 extern void ata_id_string(const u16 *id, unsigned char *s,
785 unsigned int ofs, unsigned int len);
786 extern void ata_id_c_string(const u16 *id, unsigned char *s,
787 unsigned int ofs, unsigned int len);
788 extern unsigned long ata_device_blacklisted(const struct ata_device *dev);
789 extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
790 extern void ata_bmdma_start (struct ata_queued_cmd *qc);
791 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
792 extern u8 ata_bmdma_status(struct ata_port *ap);
793 extern void ata_bmdma_irq_clear(struct ata_port *ap);
794 extern void ata_bmdma_freeze(struct ata_port *ap);
795 extern void ata_bmdma_thaw(struct ata_port *ap);
796 extern void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
797 ata_reset_fn_t softreset,
798 ata_reset_fn_t hardreset,
799 ata_postreset_fn_t postreset);
800 extern void ata_bmdma_error_handler(struct ata_port *ap);
801 extern void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc);
802 extern int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
803 u8 status, int in_wq);
804 extern void ata_qc_complete(struct ata_queued_cmd *qc);
805 extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
806 void (*finish_qc)(struct ata_queued_cmd *));
807 extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
808 void (*done)(struct scsi_cmnd *));
809 extern int ata_std_bios_param(struct scsi_device *sdev,
810 struct block_device *bdev,
811 sector_t capacity, int geom[]);
812 extern int ata_scsi_slave_config(struct scsi_device *sdev);
813 extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
814 extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
815 int queue_depth);
816 extern struct ata_device *ata_dev_pair(struct ata_device *adev);
817 extern u8 ata_irq_on(struct ata_port *ap);
818 extern u8 ata_dummy_irq_on(struct ata_port *ap);
819 extern u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq);
820 extern u8 ata_dummy_irq_ack(struct ata_port *ap, unsigned int chk_drq);
821
822 /*
823 * Timing helpers
824 */
825
826 extern unsigned int ata_pio_need_iordy(const struct ata_device *);
827 extern int ata_timing_compute(struct ata_device *, unsigned short,
828 struct ata_timing *, int, int);
829 extern void ata_timing_merge(const struct ata_timing *,
830 const struct ata_timing *, struct ata_timing *,
831 unsigned int);
832
833 enum {
834 ATA_TIMING_SETUP = (1 << 0),
835 ATA_TIMING_ACT8B = (1 << 1),
836 ATA_TIMING_REC8B = (1 << 2),
837 ATA_TIMING_CYC8B = (1 << 3),
838 ATA_TIMING_8BIT = ATA_TIMING_ACT8B | ATA_TIMING_REC8B |
839 ATA_TIMING_CYC8B,
840 ATA_TIMING_ACTIVE = (1 << 4),
841 ATA_TIMING_RECOVER = (1 << 5),
842 ATA_TIMING_CYCLE = (1 << 6),
843 ATA_TIMING_UDMA = (1 << 7),
844 ATA_TIMING_ALL = ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
845 ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
846 ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
847 ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
848 };
849
850
851 #ifdef CONFIG_PCI
852 struct pci_bits {
853 unsigned int reg; /* PCI config register to read */
854 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
855 unsigned long mask;
856 unsigned long val;
857 };
858
859 extern struct ata_probe_ent *
860 ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int portmask);
861 extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);
862 extern unsigned long ata_pci_default_filter(const struct ata_port *, struct ata_device *, unsigned long);
863 #endif /* CONFIG_PCI */
864
865 /*
866 * EH
867 */
868 extern void ata_eng_timeout(struct ata_port *ap);
869
870 extern void ata_port_schedule_eh(struct ata_port *ap);
871 extern int ata_port_abort(struct ata_port *ap);
872 extern int ata_port_freeze(struct ata_port *ap);
873
874 extern void ata_eh_freeze_port(struct ata_port *ap);
875 extern void ata_eh_thaw_port(struct ata_port *ap);
876
877 extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
878 extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
879
880 extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
881 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
882 ata_postreset_fn_t postreset);
883
884 /*
885 * printk helpers
886 */
887 #define ata_port_printk(ap, lv, fmt, args...) \
888 printk(lv"ata%u: "fmt, (ap)->id , ##args)
889
890 #define ata_dev_printk(dev, lv, fmt, args...) \
891 printk(lv"ata%u.%02u: "fmt, (dev)->ap->id, (dev)->devno , ##args)
892
893 /*
894 * ata_eh_info helpers
895 */
896 #define ata_ehi_push_desc(ehi, fmt, args...) do { \
897 (ehi)->desc_len += scnprintf((ehi)->desc + (ehi)->desc_len, \
898 ATA_EH_DESC_LEN - (ehi)->desc_len, \
899 fmt , ##args); \
900 } while (0)
901
902 #define ata_ehi_clear_desc(ehi) do { \
903 (ehi)->desc[0] = '\0'; \
904 (ehi)->desc_len = 0; \
905 } while (0)
906
907 static inline void __ata_ehi_hotplugged(struct ata_eh_info *ehi)
908 {
909 if (ehi->flags & ATA_EHI_HOTPLUGGED)
910 return;
911
912 ehi->flags |= ATA_EHI_HOTPLUGGED | ATA_EHI_RESUME_LINK;
913 ehi->hotplug_timestamp = jiffies;
914
915 ehi->action |= ATA_EH_SOFTRESET;
916 ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
917 }
918
919 static inline void ata_ehi_hotplugged(struct ata_eh_info *ehi)
920 {
921 __ata_ehi_hotplugged(ehi);
922 ehi->err_mask |= AC_ERR_ATA_BUS;
923 }
924
925 /*
926 * qc helpers
927 */
928 static inline int
929 ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
930 {
931 if (sg == &qc->pad_sgent)
932 return 1;
933 if (qc->pad_len)
934 return 0;
935 if (((sg - qc->__sg) + 1) == qc->n_elem)
936 return 1;
937 return 0;
938 }
939
940 static inline struct scatterlist *
941 ata_qc_first_sg(struct ata_queued_cmd *qc)
942 {
943 if (qc->n_elem)
944 return qc->__sg;
945 if (qc->pad_len)
946 return &qc->pad_sgent;
947 return NULL;
948 }
949
950 static inline struct scatterlist *
951 ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
952 {
953 if (sg == &qc->pad_sgent)
954 return NULL;
955 if (++sg - qc->__sg < qc->n_elem)
956 return sg;
957 if (qc->pad_len)
958 return &qc->pad_sgent;
959 return NULL;
960 }
961
962 #define ata_for_each_sg(sg, qc) \
963 for (sg = ata_qc_first_sg(qc); sg; sg = ata_qc_next_sg(sg, qc))
964
965 static inline unsigned int ata_tag_valid(unsigned int tag)
966 {
967 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
968 }
969
970 static inline unsigned int ata_tag_internal(unsigned int tag)
971 {
972 return tag == ATA_MAX_QUEUE - 1;
973 }
974
975 /*
976 * device helpers
977 */
978 static inline unsigned int ata_class_enabled(unsigned int class)
979 {
980 return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI;
981 }
982
983 static inline unsigned int ata_class_disabled(unsigned int class)
984 {
985 return class == ATA_DEV_ATA_UNSUP || class == ATA_DEV_ATAPI_UNSUP;
986 }
987
988 static inline unsigned int ata_class_absent(unsigned int class)
989 {
990 return !ata_class_enabled(class) && !ata_class_disabled(class);
991 }
992
993 static inline unsigned int ata_dev_enabled(const struct ata_device *dev)
994 {
995 return ata_class_enabled(dev->class);
996 }
997
998 static inline unsigned int ata_dev_disabled(const struct ata_device *dev)
999 {
1000 return ata_class_disabled(dev->class);
1001 }
1002
1003 static inline unsigned int ata_dev_absent(const struct ata_device *dev)
1004 {
1005 return ata_class_absent(dev->class);
1006 }
1007
1008 static inline unsigned int ata_dev_ready(const struct ata_device *dev)
1009 {
1010 return ata_dev_enabled(dev) && !(dev->flags & ATA_DFLAG_SUSPENDED);
1011 }
1012
1013 /*
1014 * port helpers
1015 */
1016 static inline int ata_port_max_devices(const struct ata_port *ap)
1017 {
1018 if (ap->flags & ATA_FLAG_SLAVE_POSS)
1019 return 2;
1020 return 1;
1021 }
1022
1023
1024 static inline u8 ata_chk_status(struct ata_port *ap)
1025 {
1026 return ap->ops->check_status(ap);
1027 }
1028
1029
1030 /**
1031 * ata_pause - Flush writes and pause 400 nanoseconds.
1032 * @ap: Port to wait for.
1033 *
1034 * LOCKING:
1035 * Inherited from caller.
1036 */
1037
1038 static inline void ata_pause(struct ata_port *ap)
1039 {
1040 ata_altstatus(ap);
1041 ndelay(400);
1042 }
1043
1044
1045 /**
1046 * ata_busy_wait - Wait for a port status register
1047 * @ap: Port to wait for.
1048 * @bits: bits that must be clear
1049 * @max: number of 10uS waits to perform
1050 *
1051 * Waits up to max*10 microseconds for the selected bits in the port's
1052 * status register to be cleared.
1053 * Returns final value of status register.
1054 *
1055 * LOCKING:
1056 * Inherited from caller.
1057 */
1058
1059 static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
1060 unsigned int max)
1061 {
1062 u8 status;
1063
1064 do {
1065 udelay(10);
1066 status = ata_chk_status(ap);
1067 max--;
1068 } while (status != 0xff && (status & bits) && (max > 0));
1069
1070 return status;
1071 }
1072
1073
1074 /**
1075 * ata_wait_idle - Wait for a port to be idle.
1076 * @ap: Port to wait for.
1077 *
1078 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
1079 * Returns final value of status register.
1080 *
1081 * LOCKING:
1082 * Inherited from caller.
1083 */
1084
1085 static inline u8 ata_wait_idle(struct ata_port *ap)
1086 {
1087 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
1088
1089 if (status != 0xff && (status & (ATA_BUSY | ATA_DRQ))) {
1090 if (ata_msg_warn(ap))
1091 printk(KERN_WARNING "ATA: abnormal status 0x%X on port 0x%p\n",
1092 status, ap->ioaddr.status_addr);
1093 }
1094
1095 return status;
1096 }
1097
1098 static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
1099 {
1100 qc->tf.ctl |= ATA_NIEN;
1101 }
1102
1103 static inline struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
1104 unsigned int tag)
1105 {
1106 if (likely(ata_tag_valid(tag)))
1107 return &ap->qcmd[tag];
1108 return NULL;
1109 }
1110
1111 static inline struct ata_queued_cmd *ata_qc_from_tag(struct ata_port *ap,
1112 unsigned int tag)
1113 {
1114 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
1115
1116 if (unlikely(!qc) || !ap->ops->error_handler)
1117 return qc;
1118
1119 if ((qc->flags & (ATA_QCFLAG_ACTIVE |
1120 ATA_QCFLAG_FAILED)) == ATA_QCFLAG_ACTIVE)
1121 return qc;
1122
1123 return NULL;
1124 }
1125
1126 static inline void ata_tf_init(struct ata_device *dev, struct ata_taskfile *tf)
1127 {
1128 memset(tf, 0, sizeof(*tf));
1129
1130 tf->ctl = dev->ap->ctl;
1131 if (dev->devno == 0)
1132 tf->device = ATA_DEVICE_OBS;
1133 else
1134 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
1135 }
1136
1137 static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
1138 {
1139 qc->dma_dir = DMA_NONE;
1140 qc->__sg = NULL;
1141 qc->flags = 0;
1142 qc->cursg = qc->cursg_ofs = 0;
1143 qc->nbytes = qc->curbytes = 0;
1144 qc->n_elem = 0;
1145 qc->err_mask = 0;
1146 qc->pad_len = 0;
1147
1148 ata_tf_init(qc->dev, &qc->tf);
1149
1150 /* init result_tf such that it indicates normal completion */
1151 qc->result_tf.command = ATA_DRDY;
1152 qc->result_tf.feature = 0;
1153 }
1154
1155 static inline int ata_try_flush_cache(const struct ata_device *dev)
1156 {
1157 return ata_id_wcache_enabled(dev->id) ||
1158 ata_id_has_flush(dev->id) ||
1159 ata_id_has_flush_ext(dev->id);
1160 }
1161
1162 static inline unsigned int ac_err_mask(u8 status)
1163 {
1164 if (status & (ATA_BUSY | ATA_DRQ))
1165 return AC_ERR_HSM;
1166 if (status & (ATA_ERR | ATA_DF))
1167 return AC_ERR_DEV;
1168 return 0;
1169 }
1170
1171 static inline unsigned int __ac_err_mask(u8 status)
1172 {
1173 unsigned int mask = ac_err_mask(status);
1174 if (mask == 0)
1175 return AC_ERR_OTHER;
1176 return mask;
1177 }
1178
1179 static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev)
1180 {
1181 ap->pad_dma = 0;
1182 ap->pad = dmam_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ,
1183 &ap->pad_dma, GFP_KERNEL);
1184 return (ap->pad == NULL) ? -ENOMEM : 0;
1185 }
1186
1187 static inline void ata_pad_free(struct ata_port *ap, struct device *dev)
1188 {
1189 dmam_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
1190 }
1191
1192 static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
1193 {
1194 return (struct ata_port *) &host->hostdata[0];
1195 }
1196
1197 #endif /* __LINUX_LIBATA_H__ */
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