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[PATCH] libata: use FLUSH_EXT only when driver is larger than LBA28 limit
[linux-2.6/cjktty.git] / include / linux / libata.h
blob36e233cc3886ddf242abc02eb89c79b7e7b86444
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 <asm/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 #define ATA_ENABLE_PATA /* define to enable PATA support in some
58 * low-level drivers */
59
60
61 /* note: prints function name for you */
62 #ifdef ATA_DEBUG
63 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
64 #ifdef ATA_VERBOSE_DEBUG
65 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
66 #else
67 #define VPRINTK(fmt, args...)
68 #endif /* ATA_VERBOSE_DEBUG */
69 #else
70 #define DPRINTK(fmt, args...)
71 #define VPRINTK(fmt, args...)
72 #endif /* ATA_DEBUG */
73
74 #define BPRINTK(fmt, args...) if (ap->flags & ATA_FLAG_DEBUGMSG) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
75
76 /* NEW: debug levels */
77 #define HAVE_LIBATA_MSG 1
78
79 enum {
80 ATA_MSG_DRV = 0x0001,
81 ATA_MSG_INFO = 0x0002,
82 ATA_MSG_PROBE = 0x0004,
83 ATA_MSG_WARN = 0x0008,
84 ATA_MSG_MALLOC = 0x0010,
85 ATA_MSG_CTL = 0x0020,
86 ATA_MSG_INTR = 0x0040,
87 ATA_MSG_ERR = 0x0080,
88 };
89
90 #define ata_msg_drv(p) ((p)->msg_enable & ATA_MSG_DRV)
91 #define ata_msg_info(p) ((p)->msg_enable & ATA_MSG_INFO)
92 #define ata_msg_probe(p) ((p)->msg_enable & ATA_MSG_PROBE)
93 #define ata_msg_warn(p) ((p)->msg_enable & ATA_MSG_WARN)
94 #define ata_msg_malloc(p) ((p)->msg_enable & ATA_MSG_MALLOC)
95 #define ata_msg_ctl(p) ((p)->msg_enable & ATA_MSG_CTL)
96 #define ata_msg_intr(p) ((p)->msg_enable & ATA_MSG_INTR)
97 #define ata_msg_err(p) ((p)->msg_enable & ATA_MSG_ERR)
98
99 static inline u32 ata_msg_init(int dval, int default_msg_enable_bits)
100 {
101 if (dval < 0 || dval >= (sizeof(u32) * 8))
102 return default_msg_enable_bits; /* should be 0x1 - only driver info msgs */
103 if (!dval)
104 return 0;
105 return (1 << dval) - 1;
106 }
107
108 /* defines only for the constants which don't work well as enums */
109 #define ATA_TAG_POISON 0xfafbfcfdU
110
111 /* move to PCI layer? */
112 #define PCI_VDEVICE(vendor, device) \
113 PCI_VENDOR_ID_##vendor, (device), \
114 PCI_ANY_ID, PCI_ANY_ID, 0, 0
115
116 static inline struct device *pci_dev_to_dev(struct pci_dev *pdev)
117 {
118 return &pdev->dev;
119 }
120
121 enum {
122 /* various global constants */
123 LIBATA_MAX_PRD = ATA_MAX_PRD / 2,
124 ATA_MAX_PORTS = 8,
125 ATA_DEF_QUEUE = 1,
126 /* tag ATA_MAX_QUEUE - 1 is reserved for internal commands */
127 ATA_MAX_QUEUE = 32,
128 ATA_TAG_INTERNAL = ATA_MAX_QUEUE - 1,
129 ATA_MAX_BUS = 2,
130 ATA_DEF_BUSY_WAIT = 10000,
131 ATA_SHORT_PAUSE = (HZ >> 6) + 1,
132
133 ATA_SHT_EMULATED = 1,
134 ATA_SHT_CMD_PER_LUN = 1,
135 ATA_SHT_THIS_ID = -1,
136 ATA_SHT_USE_CLUSTERING = 1,
137
138 /* struct ata_device stuff */
139 ATA_DFLAG_LBA = (1 << 0), /* device supports LBA */
140 ATA_DFLAG_LBA48 = (1 << 1), /* device supports LBA48 */
141 ATA_DFLAG_CDB_INTR = (1 << 2), /* device asserts INTRQ when ready for CDB */
142 ATA_DFLAG_NCQ = (1 << 3), /* device supports NCQ */
143 ATA_DFLAG_FLUSH_EXT = (1 << 4), /* do FLUSH_EXT instead of FLUSH */
144 ATA_DFLAG_CFG_MASK = (1 << 8) - 1,
145
146 ATA_DFLAG_PIO = (1 << 8), /* device limited to PIO mode */
147 ATA_DFLAG_NCQ_OFF = (1 << 9), /* device limited to non-NCQ mode */
148 ATA_DFLAG_SUSPENDED = (1 << 10), /* device suspended */
149 ATA_DFLAG_INIT_MASK = (1 << 16) - 1,
150
151 ATA_DFLAG_DETACH = (1 << 16),
152 ATA_DFLAG_DETACHED = (1 << 17),
153
154 ATA_DEV_UNKNOWN = 0, /* unknown device */
155 ATA_DEV_ATA = 1, /* ATA device */
156 ATA_DEV_ATA_UNSUP = 2, /* ATA device (unsupported) */
157 ATA_DEV_ATAPI = 3, /* ATAPI device */
158 ATA_DEV_ATAPI_UNSUP = 4, /* ATAPI device (unsupported) */
159 ATA_DEV_NONE = 5, /* no device */
160
161 /* struct ata_port flags */
162 ATA_FLAG_SLAVE_POSS = (1 << 0), /* host supports slave dev */
163 /* (doesn't imply presence) */
164 ATA_FLAG_SATA = (1 << 1),
165 ATA_FLAG_NO_LEGACY = (1 << 2), /* no legacy mode check */
166 ATA_FLAG_MMIO = (1 << 3), /* use MMIO, not PIO */
167 ATA_FLAG_SRST = (1 << 4), /* (obsolete) use ATA SRST, not E.D.D. */
168 ATA_FLAG_SATA_RESET = (1 << 5), /* (obsolete) use COMRESET */
169 ATA_FLAG_NO_ATAPI = (1 << 6), /* No ATAPI support */
170 ATA_FLAG_PIO_DMA = (1 << 7), /* PIO cmds via DMA */
171 ATA_FLAG_PIO_LBA48 = (1 << 8), /* Host DMA engine is LBA28 only */
172 ATA_FLAG_PIO_POLLING = (1 << 9), /* use polling PIO if LLD
173 * doesn't handle PIO interrupts */
174 ATA_FLAG_NCQ = (1 << 10), /* host supports NCQ */
175 ATA_FLAG_HRST_TO_RESUME = (1 << 11), /* hardreset to resume phy */
176 ATA_FLAG_SKIP_D2H_BSY = (1 << 12), /* can't wait for the first D2H
177 * Register FIS clearing BSY */
178 ATA_FLAG_DEBUGMSG = (1 << 13),
179
180 /* The following flag belongs to ap->pflags but is kept in
181 * ap->flags because it's referenced in many LLDs and will be
182 * removed in not-too-distant future.
183 */
184 ATA_FLAG_DISABLED = (1 << 23), /* port is disabled, ignore it */
185
186 /* bits 24:31 of ap->flags are reserved for LLD specific flags */
187
188 /* struct ata_port pflags */
189 ATA_PFLAG_EH_PENDING = (1 << 0), /* EH pending */
190 ATA_PFLAG_EH_IN_PROGRESS = (1 << 1), /* EH in progress */
191 ATA_PFLAG_FROZEN = (1 << 2), /* port is frozen */
192 ATA_PFLAG_RECOVERED = (1 << 3), /* recovery action performed */
193 ATA_PFLAG_LOADING = (1 << 4), /* boot/loading probe */
194 ATA_PFLAG_UNLOADING = (1 << 5), /* module is unloading */
195 ATA_PFLAG_SCSI_HOTPLUG = (1 << 6), /* SCSI hotplug scheduled */
196
197 ATA_PFLAG_FLUSH_PORT_TASK = (1 << 16), /* flush port task */
198 ATA_PFLAG_SUSPENDED = (1 << 17), /* port is suspended (power) */
199 ATA_PFLAG_PM_PENDING = (1 << 18), /* PM operation pending */
200
201 /* struct ata_queued_cmd flags */
202 ATA_QCFLAG_ACTIVE = (1 << 0), /* cmd not yet ack'd to scsi lyer */
203 ATA_QCFLAG_SG = (1 << 1), /* have s/g table? */
204 ATA_QCFLAG_SINGLE = (1 << 2), /* no s/g, just a single buffer */
205 ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
206 ATA_QCFLAG_IO = (1 << 3), /* standard IO command */
207 ATA_QCFLAG_RESULT_TF = (1 << 4), /* result TF requested */
208
209 ATA_QCFLAG_FAILED = (1 << 16), /* cmd failed and is owned by EH */
210 ATA_QCFLAG_SENSE_VALID = (1 << 17), /* sense data valid */
211 ATA_QCFLAG_EH_SCHEDULED = (1 << 18), /* EH scheduled (obsolete) */
212
213 /* host set flags */
214 ATA_HOST_SIMPLEX = (1 << 0), /* Host is simplex, one DMA channel per host only */
215
216 /* various lengths of time */
217 ATA_TMOUT_BOOT = 30 * HZ, /* heuristic */
218 ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* heuristic */
219 ATA_TMOUT_INTERNAL = 30 * HZ,
220 ATA_TMOUT_INTERNAL_QUICK = 5 * HZ,
221
222 /* ATA bus states */
223 BUS_UNKNOWN = 0,
224 BUS_DMA = 1,
225 BUS_IDLE = 2,
226 BUS_NOINTR = 3,
227 BUS_NODATA = 4,
228 BUS_TIMER = 5,
229 BUS_PIO = 6,
230 BUS_EDD = 7,
231 BUS_IDENTIFY = 8,
232 BUS_PACKET = 9,
233
234 /* SATA port states */
235 PORT_UNKNOWN = 0,
236 PORT_ENABLED = 1,
237 PORT_DISABLED = 2,
238
239 /* encoding various smaller bitmaps into a single
240 * unsigned int bitmap
241 */
242 ATA_BITS_PIO = 7,
243 ATA_BITS_MWDMA = 5,
244 ATA_BITS_UDMA = 8,
245
246 ATA_SHIFT_PIO = 0,
247 ATA_SHIFT_MWDMA = ATA_SHIFT_PIO + ATA_BITS_PIO,
248 ATA_SHIFT_UDMA = ATA_SHIFT_MWDMA + ATA_BITS_MWDMA,
249
250 ATA_MASK_PIO = ((1 << ATA_BITS_PIO) - 1) << ATA_SHIFT_PIO,
251 ATA_MASK_MWDMA = ((1 << ATA_BITS_MWDMA) - 1) << ATA_SHIFT_MWDMA,
252 ATA_MASK_UDMA = ((1 << ATA_BITS_UDMA) - 1) << ATA_SHIFT_UDMA,
253
254 /* size of buffer to pad xfers ending on unaligned boundaries */
255 ATA_DMA_PAD_SZ = 4,
256 ATA_DMA_PAD_BUF_SZ = ATA_DMA_PAD_SZ * ATA_MAX_QUEUE,
257
258 /* masks for port functions */
259 ATA_PORT_PRIMARY = (1 << 0),
260 ATA_PORT_SECONDARY = (1 << 1),
261
262 /* ering size */
263 ATA_ERING_SIZE = 32,
264
265 /* desc_len for ata_eh_info and context */
266 ATA_EH_DESC_LEN = 80,
267
268 /* reset / recovery action types */
269 ATA_EH_REVALIDATE = (1 << 0),
270 ATA_EH_SOFTRESET = (1 << 1),
271 ATA_EH_HARDRESET = (1 << 2),
272 ATA_EH_SUSPEND = (1 << 3),
273 ATA_EH_RESUME = (1 << 4),
274 ATA_EH_PM_FREEZE = (1 << 5),
275
276 ATA_EH_RESET_MASK = ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
277 ATA_EH_PERDEV_MASK = ATA_EH_REVALIDATE | ATA_EH_SUSPEND |
278 ATA_EH_RESUME | ATA_EH_PM_FREEZE,
279
280 /* ata_eh_info->flags */
281 ATA_EHI_HOTPLUGGED = (1 << 0), /* could have been hotplugged */
282 ATA_EHI_RESUME_LINK = (1 << 1), /* resume link (reset modifier) */
283 ATA_EHI_NO_AUTOPSY = (1 << 2), /* no autopsy */
284 ATA_EHI_QUIET = (1 << 3), /* be quiet */
285
286 ATA_EHI_DID_RESET = (1 << 16), /* already reset this port */
287 ATA_EHI_PRINTINFO = (1 << 17), /* print configuration info */
288 ATA_EHI_SETMODE = (1 << 18), /* configure transfer mode */
289 ATA_EHI_POST_SETMODE = (1 << 19), /* revaildating after setmode */
290
291 ATA_EHI_RESET_MODIFIER_MASK = ATA_EHI_RESUME_LINK,
292
293 /* max repeat if error condition is still set after ->error_handler */
294 ATA_EH_MAX_REPEAT = 5,
295
296 /* how hard are we gonna try to probe/recover devices */
297 ATA_PROBE_MAX_TRIES = 3,
298 ATA_EH_RESET_TRIES = 3,
299 ATA_EH_DEV_TRIES = 3,
300
301 /* Drive spinup time (time from power-on to the first D2H FIS)
302 * in msecs - 8s currently. Failing to get ready in this time
303 * isn't critical. It will result in reset failure for
304 * controllers which can't wait for the first D2H FIS. libata
305 * will retry, so it just has to be long enough to spin up
306 * most devices.
307 */
308 ATA_SPINUP_WAIT = 8000,
309
310 /* Horkage types. May be set by libata or controller on drives
311 (some horkage may be drive/controller pair dependant */
312
313 ATA_HORKAGE_DIAGNOSTIC = (1 << 0), /* Failed boot diag */
314 ATA_HORKAGE_NODMA = (1 << 1), /* DMA problems */
315 ATA_HORKAGE_NONCQ = (1 << 2), /* Don't use NCQ */
316 };
317
318 enum hsm_task_states {
319 HSM_ST_UNKNOWN, /* state unknown */
320 HSM_ST_IDLE, /* no command on going */
321 HSM_ST, /* (waiting the device to) transfer data */
322 HSM_ST_LAST, /* (waiting the device to) complete command */
323 HSM_ST_ERR, /* error */
324 HSM_ST_FIRST, /* (waiting the device to)
325 write CDB or first data block */
326 };
327
328 enum ata_completion_errors {
329 AC_ERR_DEV = (1 << 0), /* device reported error */
330 AC_ERR_HSM = (1 << 1), /* host state machine violation */
331 AC_ERR_TIMEOUT = (1 << 2), /* timeout */
332 AC_ERR_MEDIA = (1 << 3), /* media error */
333 AC_ERR_ATA_BUS = (1 << 4), /* ATA bus error */
334 AC_ERR_HOST_BUS = (1 << 5), /* host bus error */
335 AC_ERR_SYSTEM = (1 << 6), /* system error */
336 AC_ERR_INVALID = (1 << 7), /* invalid argument */
337 AC_ERR_OTHER = (1 << 8), /* unknown */
338 };
339
340 /* forward declarations */
341 struct scsi_device;
342 struct ata_port_operations;
343 struct ata_port;
344 struct ata_queued_cmd;
345
346 /* typedefs */
347 typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
348 typedef int (*ata_prereset_fn_t)(struct ata_port *ap);
349 typedef int (*ata_reset_fn_t)(struct ata_port *ap, unsigned int *classes);
350 typedef void (*ata_postreset_fn_t)(struct ata_port *ap, unsigned int *classes);
351
352 struct ata_ioports {
353 unsigned long cmd_addr;
354 unsigned long data_addr;
355 unsigned long error_addr;
356 unsigned long feature_addr;
357 unsigned long nsect_addr;
358 unsigned long lbal_addr;
359 unsigned long lbam_addr;
360 unsigned long lbah_addr;
361 unsigned long device_addr;
362 unsigned long status_addr;
363 unsigned long command_addr;
364 unsigned long altstatus_addr;
365 unsigned long ctl_addr;
366 unsigned long bmdma_addr;
367 unsigned long scr_addr;
368 };
369
370 struct ata_probe_ent {
371 struct list_head node;
372 struct device *dev;
373 const struct ata_port_operations *port_ops;
374 struct scsi_host_template *sht;
375 struct ata_ioports port[ATA_MAX_PORTS];
376 unsigned int n_ports;
377 unsigned int dummy_port_mask;
378 unsigned int pio_mask;
379 unsigned int mwdma_mask;
380 unsigned int udma_mask;
381 unsigned long irq;
382 unsigned long irq2;
383 unsigned int irq_flags;
384 unsigned long port_flags;
385 unsigned long _host_flags;
386 void __iomem *mmio_base;
387 void *private_data;
388
389 /* port_info for the secondary port. Together with irq2, it's
390 * used to implement non-uniform secondary port. Currently,
391 * the only user is ata_piix combined mode. This workaround
392 * will be removed together with ata_probe_ent when init model
393 * is updated.
394 */
395 const struct ata_port_info *pinfo2;
396 };
397
398 struct ata_host {
399 spinlock_t lock;
400 struct device *dev;
401 unsigned long irq;
402 unsigned long irq2;
403 void __iomem *mmio_base;
404 unsigned int n_ports;
405 void *private_data;
406 const struct ata_port_operations *ops;
407 unsigned long flags;
408 int simplex_claimed; /* Keep seperate in case we
409 ever need to do this locked */
410 struct ata_port *ports[0];
411 };
412
413 struct ata_queued_cmd {
414 struct ata_port *ap;
415 struct ata_device *dev;
416
417 struct scsi_cmnd *scsicmd;
418 void (*scsidone)(struct scsi_cmnd *);
419
420 struct ata_taskfile tf;
421 u8 cdb[ATAPI_CDB_LEN];
422
423 unsigned long flags; /* ATA_QCFLAG_xxx */
424 unsigned int tag;
425 unsigned int n_elem;
426 unsigned int orig_n_elem;
427
428 int dma_dir;
429
430 unsigned int pad_len;
431
432 unsigned int nsect;
433 unsigned int cursect;
434
435 unsigned int nbytes;
436 unsigned int curbytes;
437
438 unsigned int cursg;
439 unsigned int cursg_ofs;
440
441 struct scatterlist sgent;
442 struct scatterlist pad_sgent;
443 void *buf_virt;
444
445 /* DO NOT iterate over __sg manually, use ata_for_each_sg() */
446 struct scatterlist *__sg;
447
448 unsigned int err_mask;
449 struct ata_taskfile result_tf;
450 ata_qc_cb_t complete_fn;
451
452 void *private_data;
453 };
454
455 struct ata_port_stats {
456 unsigned long unhandled_irq;
457 unsigned long idle_irq;
458 unsigned long rw_reqbuf;
459 };
460
461 struct ata_ering_entry {
462 int is_io;
463 unsigned int err_mask;
464 u64 timestamp;
465 };
466
467 struct ata_ering {
468 int cursor;
469 struct ata_ering_entry ring[ATA_ERING_SIZE];
470 };
471
472 struct ata_device {
473 struct ata_port *ap;
474 unsigned int devno; /* 0 or 1 */
475 unsigned long flags; /* ATA_DFLAG_xxx */
476 struct scsi_device *sdev; /* attached SCSI device */
477 /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
478 u64 n_sectors; /* size of device, if ATA */
479 unsigned int class; /* ATA_DEV_xxx */
480 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
481 u8 pio_mode;
482 u8 dma_mode;
483 u8 xfer_mode;
484 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
485
486 unsigned int multi_count; /* sectors count for
487 READ/WRITE MULTIPLE */
488 unsigned int max_sectors; /* per-device max sectors */
489 unsigned int cdb_len;
490
491 /* per-dev xfer mask */
492 unsigned int pio_mask;
493 unsigned int mwdma_mask;
494 unsigned int udma_mask;
495
496 /* for CHS addressing */
497 u16 cylinders; /* Number of cylinders */
498 u16 heads; /* Number of heads */
499 u16 sectors; /* Number of sectors per track */
500
501 /* error history */
502 struct ata_ering ering;
503 unsigned int horkage; /* List of broken features */
504 };
505
506 /* Offset into struct ata_device. Fields above it are maintained
507 * acress device init. Fields below are zeroed.
508 */
509 #define ATA_DEVICE_CLEAR_OFFSET offsetof(struct ata_device, n_sectors)
510
511 struct ata_eh_info {
512 struct ata_device *dev; /* offending device */
513 u32 serror; /* SError from LLDD */
514 unsigned int err_mask; /* port-wide err_mask */
515 unsigned int action; /* ATA_EH_* action mask */
516 unsigned int dev_action[ATA_MAX_DEVICES]; /* dev EH action */
517 unsigned int flags; /* ATA_EHI_* flags */
518
519 unsigned long hotplug_timestamp;
520 unsigned int probe_mask;
521
522 char desc[ATA_EH_DESC_LEN];
523 int desc_len;
524 };
525
526 struct ata_eh_context {
527 struct ata_eh_info i;
528 int tries[ATA_MAX_DEVICES];
529 unsigned int classes[ATA_MAX_DEVICES];
530 unsigned int did_probe_mask;
531 };
532
533 struct ata_port {
534 struct Scsi_Host *scsi_host; /* our co-allocated scsi host */
535 const struct ata_port_operations *ops;
536 spinlock_t *lock;
537 unsigned long flags; /* ATA_FLAG_xxx */
538 unsigned int pflags; /* ATA_PFLAG_xxx */
539 unsigned int id; /* unique id req'd by scsi midlyr */
540 unsigned int port_no; /* unique port #; from zero */
541
542 struct ata_prd *prd; /* our SG list */
543 dma_addr_t prd_dma; /* and its DMA mapping */
544
545 void *pad; /* array of DMA pad buffers */
546 dma_addr_t pad_dma;
547
548 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
549
550 u8 ctl; /* cache of ATA control register */
551 u8 last_ctl; /* Cache last written value */
552 unsigned int pio_mask;
553 unsigned int mwdma_mask;
554 unsigned int udma_mask;
555 unsigned int cbl; /* cable type; ATA_CBL_xxx */
556 unsigned int hw_sata_spd_limit;
557 unsigned int sata_spd_limit; /* SATA PHY speed limit */
558
559 /* record runtime error info, protected by host lock */
560 struct ata_eh_info eh_info;
561 /* EH context owned by EH */
562 struct ata_eh_context eh_context;
563
564 struct ata_device device[ATA_MAX_DEVICES];
565
566 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
567 unsigned long qc_allocated;
568 unsigned int qc_active;
569
570 unsigned int active_tag;
571 u32 sactive;
572
573 struct ata_port_stats stats;
574 struct ata_host *host;
575 struct device *dev;
576
577 struct work_struct port_task;
578 struct work_struct hotplug_task;
579 struct work_struct scsi_rescan_task;
580
581 unsigned int hsm_task_state;
582
583 u32 msg_enable;
584 struct list_head eh_done_q;
585 wait_queue_head_t eh_wait_q;
586
587 pm_message_t pm_mesg;
588 int *pm_result;
589
590 void *private_data;
591
592 u8 sector_buf[ATA_SECT_SIZE]; /* owned by EH */
593 };
594
595 struct ata_port_operations {
596 void (*port_disable) (struct ata_port *);
597
598 void (*dev_config) (struct ata_port *, struct ata_device *);
599
600 void (*set_piomode) (struct ata_port *, struct ata_device *);
601 void (*set_dmamode) (struct ata_port *, struct ata_device *);
602 unsigned long (*mode_filter) (const struct ata_port *, struct ata_device *, unsigned long);
603
604 void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
605 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
606
607 void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
608 u8 (*check_status)(struct ata_port *ap);
609 u8 (*check_altstatus)(struct ata_port *ap);
610 void (*dev_select)(struct ata_port *ap, unsigned int device);
611
612 void (*phy_reset) (struct ata_port *ap); /* obsolete */
613 void (*set_mode) (struct ata_port *ap);
614
615 void (*post_set_mode) (struct ata_port *ap);
616
617 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
618
619 void (*bmdma_setup) (struct ata_queued_cmd *qc);
620 void (*bmdma_start) (struct ata_queued_cmd *qc);
621
622 void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
623
624 void (*qc_prep) (struct ata_queued_cmd *qc);
625 unsigned int (*qc_issue) (struct ata_queued_cmd *qc);
626
627 /* Error handlers. ->error_handler overrides ->eng_timeout and
628 * indicates that new-style EH is in place.
629 */
630 void (*eng_timeout) (struct ata_port *ap); /* obsolete */
631
632 void (*freeze) (struct ata_port *ap);
633 void (*thaw) (struct ata_port *ap);
634 void (*error_handler) (struct ata_port *ap);
635 void (*post_internal_cmd) (struct ata_queued_cmd *qc);
636
637 irq_handler_t irq_handler;
638 void (*irq_clear) (struct ata_port *);
639
640 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
641 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
642 u32 val);
643
644 int (*port_suspend) (struct ata_port *ap, pm_message_t mesg);
645 int (*port_resume) (struct ata_port *ap);
646
647 int (*port_start) (struct ata_port *ap);
648 void (*port_stop) (struct ata_port *ap);
649
650 void (*host_stop) (struct ata_host *host);
651
652 void (*bmdma_stop) (struct ata_queued_cmd *qc);
653 u8 (*bmdma_status) (struct ata_port *ap);
654 };
655
656 struct ata_port_info {
657 struct scsi_host_template *sht;
658 unsigned long flags;
659 unsigned long pio_mask;
660 unsigned long mwdma_mask;
661 unsigned long udma_mask;
662 const struct ata_port_operations *port_ops;
663 void *private_data;
664 };
665
666 struct ata_timing {
667 unsigned short mode; /* ATA mode */
668 unsigned short setup; /* t1 */
669 unsigned short act8b; /* t2 for 8-bit I/O */
670 unsigned short rec8b; /* t2i for 8-bit I/O */
671 unsigned short cyc8b; /* t0 for 8-bit I/O */
672 unsigned short active; /* t2 or tD */
673 unsigned short recover; /* t2i or tK */
674 unsigned short cycle; /* t0 */
675 unsigned short udma; /* t2CYCTYP/2 */
676 };
677
678 #define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
679
680 extern const unsigned long sata_deb_timing_normal[];
681 extern const unsigned long sata_deb_timing_hotplug[];
682 extern const unsigned long sata_deb_timing_long[];
683
684 extern const struct ata_port_operations ata_dummy_port_ops;
685
686 static inline const unsigned long *
687 sata_ehc_deb_timing(struct ata_eh_context *ehc)
688 {
689 if (ehc->i.flags & ATA_EHI_HOTPLUGGED)
690 return sata_deb_timing_hotplug;
691 else
692 return sata_deb_timing_normal;
693 }
694
695 static inline int ata_port_is_dummy(struct ata_port *ap)
696 {
697 return ap->ops == &ata_dummy_port_ops;
698 }
699
700 extern void ata_port_probe(struct ata_port *);
701 extern void __sata_phy_reset(struct ata_port *ap);
702 extern void sata_phy_reset(struct ata_port *ap);
703 extern void ata_bus_reset(struct ata_port *ap);
704 extern int sata_set_spd(struct ata_port *ap);
705 extern int sata_phy_debounce(struct ata_port *ap, const unsigned long *param);
706 extern int sata_phy_resume(struct ata_port *ap, const unsigned long *param);
707 extern int ata_std_prereset(struct ata_port *ap);
708 extern int ata_std_softreset(struct ata_port *ap, unsigned int *classes);
709 extern int sata_port_hardreset(struct ata_port *ap,
710 const unsigned long *timing);
711 extern int sata_std_hardreset(struct ata_port *ap, unsigned int *class);
712 extern void ata_std_postreset(struct ata_port *ap, unsigned int *classes);
713 extern void ata_port_disable(struct ata_port *);
714 extern void ata_std_ports(struct ata_ioports *ioaddr);
715 #ifdef CONFIG_PCI
716 extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
717 unsigned int n_ports);
718 extern void ata_pci_remove_one (struct pci_dev *pdev);
719 extern void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg);
720 extern void ata_pci_device_do_resume(struct pci_dev *pdev);
721 extern int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
722 extern int ata_pci_device_resume(struct pci_dev *pdev);
723 extern int ata_pci_clear_simplex(struct pci_dev *pdev);
724 #endif /* CONFIG_PCI */
725 extern int ata_device_add(const struct ata_probe_ent *ent);
726 extern void ata_port_detach(struct ata_port *ap);
727 extern void ata_host_init(struct ata_host *, struct device *,
728 unsigned long, const struct ata_port_operations *);
729 extern void ata_host_remove(struct ata_host *host);
730 extern int ata_scsi_detect(struct scsi_host_template *sht);
731 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
732 extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
733 extern int ata_scsi_release(struct Scsi_Host *host);
734 extern void ata_sas_port_destroy(struct ata_port *);
735 extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
736 struct ata_port_info *, struct Scsi_Host *);
737 extern int ata_sas_port_init(struct ata_port *);
738 extern int ata_sas_port_start(struct ata_port *ap);
739 extern void ata_sas_port_stop(struct ata_port *ap);
740 extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
741 extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
742 struct ata_port *ap);
743 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
744 extern int sata_scr_valid(struct ata_port *ap);
745 extern int sata_scr_read(struct ata_port *ap, int reg, u32 *val);
746 extern int sata_scr_write(struct ata_port *ap, int reg, u32 val);
747 extern int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val);
748 extern int ata_port_online(struct ata_port *ap);
749 extern int ata_port_offline(struct ata_port *ap);
750 extern int ata_scsi_device_resume(struct scsi_device *);
751 extern int ata_scsi_device_suspend(struct scsi_device *, pm_message_t mesg);
752 extern int ata_host_suspend(struct ata_host *host, pm_message_t mesg);
753 extern void ata_host_resume(struct ata_host *host);
754 extern int ata_ratelimit(void);
755 extern int ata_busy_sleep(struct ata_port *ap,
756 unsigned long timeout_pat, unsigned long timeout);
757 extern void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *),
758 void *data, unsigned long delay);
759 extern u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
760 unsigned long interval_msec,
761 unsigned long timeout_msec);
762
763 /*
764 * Default driver ops implementations
765 */
766 extern void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
767 extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
768 extern void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp);
769 extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
770 extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
771 extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
772 extern u8 ata_check_status(struct ata_port *ap);
773 extern u8 ata_altstatus(struct ata_port *ap);
774 extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf);
775 extern int ata_port_start (struct ata_port *ap);
776 extern void ata_port_stop (struct ata_port *ap);
777 extern void ata_host_stop (struct ata_host *host);
778 extern irqreturn_t ata_interrupt (int irq, void *dev_instance);
779 extern void ata_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
780 unsigned int buflen, int write_data);
781 extern void ata_pio_data_xfer(struct ata_device *adev, unsigned char *buf,
782 unsigned int buflen, int write_data);
783 extern void ata_pio_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
784 unsigned int buflen, int write_data);
785 extern void ata_qc_prep(struct ata_queued_cmd *qc);
786 extern void ata_noop_qc_prep(struct ata_queued_cmd *qc);
787 extern unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc);
788 extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
789 unsigned int buflen);
790 extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
791 unsigned int n_elem);
792 extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
793 extern void ata_id_string(const u16 *id, unsigned char *s,
794 unsigned int ofs, unsigned int len);
795 extern void ata_id_c_string(const u16 *id, unsigned char *s,
796 unsigned int ofs, unsigned int len);
797 extern unsigned long ata_device_blacklisted(const struct ata_device *dev);
798 extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
799 extern void ata_bmdma_start (struct ata_queued_cmd *qc);
800 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
801 extern u8 ata_bmdma_status(struct ata_port *ap);
802 extern void ata_bmdma_irq_clear(struct ata_port *ap);
803 extern void ata_bmdma_freeze(struct ata_port *ap);
804 extern void ata_bmdma_thaw(struct ata_port *ap);
805 extern void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
806 ata_reset_fn_t softreset,
807 ata_reset_fn_t hardreset,
808 ata_postreset_fn_t postreset);
809 extern void ata_bmdma_error_handler(struct ata_port *ap);
810 extern void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc);
811 extern int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
812 u8 status, int in_wq);
813 extern void ata_qc_complete(struct ata_queued_cmd *qc);
814 extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
815 void (*finish_qc)(struct ata_queued_cmd *));
816 extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
817 void (*done)(struct scsi_cmnd *));
818 extern int ata_std_bios_param(struct scsi_device *sdev,
819 struct block_device *bdev,
820 sector_t capacity, int geom[]);
821 extern int ata_scsi_slave_config(struct scsi_device *sdev);
822 extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
823 extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
824 int queue_depth);
825 extern struct ata_device *ata_dev_pair(struct ata_device *adev);
826
827 /*
828 * Timing helpers
829 */
830
831 extern unsigned int ata_pio_need_iordy(const struct ata_device *);
832 extern int ata_timing_compute(struct ata_device *, unsigned short,
833 struct ata_timing *, int, int);
834 extern void ata_timing_merge(const struct ata_timing *,
835 const struct ata_timing *, struct ata_timing *,
836 unsigned int);
837
838 enum {
839 ATA_TIMING_SETUP = (1 << 0),
840 ATA_TIMING_ACT8B = (1 << 1),
841 ATA_TIMING_REC8B = (1 << 2),
842 ATA_TIMING_CYC8B = (1 << 3),
843 ATA_TIMING_8BIT = ATA_TIMING_ACT8B | ATA_TIMING_REC8B |
844 ATA_TIMING_CYC8B,
845 ATA_TIMING_ACTIVE = (1 << 4),
846 ATA_TIMING_RECOVER = (1 << 5),
847 ATA_TIMING_CYCLE = (1 << 6),
848 ATA_TIMING_UDMA = (1 << 7),
849 ATA_TIMING_ALL = ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
850 ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
851 ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
852 ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
853 };
854
855
856 #ifdef CONFIG_PCI
857 struct pci_bits {
858 unsigned int reg; /* PCI config register to read */
859 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
860 unsigned long mask;
861 unsigned long val;
862 };
863
864 extern void ata_pci_host_stop (struct ata_host *host);
865 extern struct ata_probe_ent *
866 ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int portmask);
867 extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);
868 extern unsigned long ata_pci_default_filter(const struct ata_port *, struct ata_device *, unsigned long);
869 #endif /* CONFIG_PCI */
870
871 /*
872 * EH
873 */
874 extern void ata_eng_timeout(struct ata_port *ap);
875
876 extern void ata_port_schedule_eh(struct ata_port *ap);
877 extern int ata_port_abort(struct ata_port *ap);
878 extern int ata_port_freeze(struct ata_port *ap);
879
880 extern void ata_eh_freeze_port(struct ata_port *ap);
881 extern void ata_eh_thaw_port(struct ata_port *ap);
882
883 extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
884 extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
885
886 extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
887 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
888 ata_postreset_fn_t postreset);
889
890 /*
891 * printk helpers
892 */
893 #define ata_port_printk(ap, lv, fmt, args...) \
894 printk(lv"ata%u: "fmt, (ap)->id , ##args)
895
896 #define ata_dev_printk(dev, lv, fmt, args...) \
897 printk(lv"ata%u.%02u: "fmt, (dev)->ap->id, (dev)->devno , ##args)
898
899 /*
900 * ata_eh_info helpers
901 */
902 #define ata_ehi_push_desc(ehi, fmt, args...) do { \
903 (ehi)->desc_len += scnprintf((ehi)->desc + (ehi)->desc_len, \
904 ATA_EH_DESC_LEN - (ehi)->desc_len, \
905 fmt , ##args); \
906 } while (0)
907
908 #define ata_ehi_clear_desc(ehi) do { \
909 (ehi)->desc[0] = '\0'; \
910 (ehi)->desc_len = 0; \
911 } while (0)
912
913 static inline void __ata_ehi_hotplugged(struct ata_eh_info *ehi)
914 {
915 if (ehi->flags & ATA_EHI_HOTPLUGGED)
916 return;
917
918 ehi->flags |= ATA_EHI_HOTPLUGGED | ATA_EHI_RESUME_LINK;
919 ehi->hotplug_timestamp = jiffies;
920
921 ehi->action |= ATA_EH_SOFTRESET;
922 ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
923 }
924
925 static inline void ata_ehi_hotplugged(struct ata_eh_info *ehi)
926 {
927 __ata_ehi_hotplugged(ehi);
928 ehi->err_mask |= AC_ERR_ATA_BUS;
929 }
930
931 /*
932 * qc helpers
933 */
934 static inline int
935 ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
936 {
937 if (sg == &qc->pad_sgent)
938 return 1;
939 if (qc->pad_len)
940 return 0;
941 if (((sg - qc->__sg) + 1) == qc->n_elem)
942 return 1;
943 return 0;
944 }
945
946 static inline struct scatterlist *
947 ata_qc_first_sg(struct ata_queued_cmd *qc)
948 {
949 if (qc->n_elem)
950 return qc->__sg;
951 if (qc->pad_len)
952 return &qc->pad_sgent;
953 return NULL;
954 }
955
956 static inline struct scatterlist *
957 ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
958 {
959 if (sg == &qc->pad_sgent)
960 return NULL;
961 if (++sg - qc->__sg < qc->n_elem)
962 return sg;
963 if (qc->pad_len)
964 return &qc->pad_sgent;
965 return NULL;
966 }
967
968 #define ata_for_each_sg(sg, qc) \
969 for (sg = ata_qc_first_sg(qc); sg; sg = ata_qc_next_sg(sg, qc))
970
971 static inline unsigned int ata_tag_valid(unsigned int tag)
972 {
973 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
974 }
975
976 static inline unsigned int ata_tag_internal(unsigned int tag)
977 {
978 return tag == ATA_MAX_QUEUE - 1;
979 }
980
981 /*
982 * device helpers
983 */
984 static inline unsigned int ata_class_enabled(unsigned int class)
985 {
986 return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI;
987 }
988
989 static inline unsigned int ata_class_disabled(unsigned int class)
990 {
991 return class == ATA_DEV_ATA_UNSUP || class == ATA_DEV_ATAPI_UNSUP;
992 }
993
994 static inline unsigned int ata_class_absent(unsigned int class)
995 {
996 return !ata_class_enabled(class) && !ata_class_disabled(class);
997 }
998
999 static inline unsigned int ata_dev_enabled(const struct ata_device *dev)
1000 {
1001 return ata_class_enabled(dev->class);
1002 }
1003
1004 static inline unsigned int ata_dev_disabled(const struct ata_device *dev)
1005 {
1006 return ata_class_disabled(dev->class);
1007 }
1008
1009 static inline unsigned int ata_dev_absent(const struct ata_device *dev)
1010 {
1011 return ata_class_absent(dev->class);
1012 }
1013
1014 static inline unsigned int ata_dev_ready(const struct ata_device *dev)
1015 {
1016 return ata_dev_enabled(dev) && !(dev->flags & ATA_DFLAG_SUSPENDED);
1017 }
1018
1019 /*
1020 * port helpers
1021 */
1022 static inline int ata_port_max_devices(const struct ata_port *ap)
1023 {
1024 if (ap->flags & ATA_FLAG_SLAVE_POSS)
1025 return 2;
1026 return 1;
1027 }
1028
1029
1030 static inline u8 ata_chk_status(struct ata_port *ap)
1031 {
1032 return ap->ops->check_status(ap);
1033 }
1034
1035
1036 /**
1037 * ata_pause - Flush writes and pause 400 nanoseconds.
1038 * @ap: Port to wait for.
1039 *
1040 * LOCKING:
1041 * Inherited from caller.
1042 */
1043
1044 static inline void ata_pause(struct ata_port *ap)
1045 {
1046 ata_altstatus(ap);
1047 ndelay(400);
1048 }
1049
1050
1051 /**
1052 * ata_busy_wait - Wait for a port status register
1053 * @ap: Port to wait for.
1054 *
1055 * Waits up to max*10 microseconds for the selected bits in the port's
1056 * status register to be cleared.
1057 * Returns final value of status register.
1058 *
1059 * LOCKING:
1060 * Inherited from caller.
1061 */
1062
1063 static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
1064 unsigned int max)
1065 {
1066 u8 status;
1067
1068 do {
1069 udelay(10);
1070 status = ata_chk_status(ap);
1071 max--;
1072 } while (status != 0xff && (status & bits) && (max > 0));
1073
1074 return status;
1075 }
1076
1077
1078 /**
1079 * ata_wait_idle - Wait for a port to be idle.
1080 * @ap: Port to wait for.
1081 *
1082 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
1083 * Returns final value of status register.
1084 *
1085 * LOCKING:
1086 * Inherited from caller.
1087 */
1088
1089 static inline u8 ata_wait_idle(struct ata_port *ap)
1090 {
1091 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
1092
1093 if (status != 0xff && (status & (ATA_BUSY | ATA_DRQ))) {
1094 unsigned long l = ap->ioaddr.status_addr;
1095 if (ata_msg_warn(ap))
1096 printk(KERN_WARNING "ATA: abnormal status 0x%X on port 0x%lX\n",
1097 status, l);
1098 }
1099
1100 return status;
1101 }
1102
1103 static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
1104 {
1105 qc->tf.ctl |= ATA_NIEN;
1106 }
1107
1108 static inline struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
1109 unsigned int tag)
1110 {
1111 if (likely(ata_tag_valid(tag)))
1112 return &ap->qcmd[tag];
1113 return NULL;
1114 }
1115
1116 static inline struct ata_queued_cmd *ata_qc_from_tag(struct ata_port *ap,
1117 unsigned int tag)
1118 {
1119 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
1120
1121 if (unlikely(!qc) || !ap->ops->error_handler)
1122 return qc;
1123
1124 if ((qc->flags & (ATA_QCFLAG_ACTIVE |
1125 ATA_QCFLAG_FAILED)) == ATA_QCFLAG_ACTIVE)
1126 return qc;
1127
1128 return NULL;
1129 }
1130
1131 static inline void ata_tf_init(struct ata_device *dev, struct ata_taskfile *tf)
1132 {
1133 memset(tf, 0, sizeof(*tf));
1134
1135 tf->ctl = dev->ap->ctl;
1136 if (dev->devno == 0)
1137 tf->device = ATA_DEVICE_OBS;
1138 else
1139 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
1140 }
1141
1142 static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
1143 {
1144 qc->__sg = NULL;
1145 qc->flags = 0;
1146 qc->cursect = qc->cursg = qc->cursg_ofs = 0;
1147 qc->nsect = 0;
1148 qc->nbytes = qc->curbytes = 0;
1149 qc->err_mask = 0;
1150
1151 ata_tf_init(qc->dev, &qc->tf);
1152
1153 /* init result_tf such that it indicates normal completion */
1154 qc->result_tf.command = ATA_DRDY;
1155 qc->result_tf.feature = 0;
1156 }
1157
1158 /**
1159 * ata_irq_ack - Acknowledge a device interrupt.
1160 * @ap: Port on which interrupts are enabled.
1161 *
1162 * Wait up to 10 ms for legacy IDE device to become idle (BUSY
1163 * or BUSY+DRQ clear). Obtain dma status and port status from
1164 * device. Clear the interrupt. Return port status.
1165 *
1166 * LOCKING:
1167 */
1168
1169 static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
1170 {
1171 unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
1172 u8 host_stat, post_stat, status;
1173
1174 status = ata_busy_wait(ap, bits, 1000);
1175 if (status & bits)
1176 if (ata_msg_err(ap))
1177 printk(KERN_ERR "abnormal status 0x%X\n", status);
1178
1179 /* get controller status; clear intr, err bits */
1180 if (ap->flags & ATA_FLAG_MMIO) {
1181 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
1182 host_stat = readb(mmio + ATA_DMA_STATUS);
1183 writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
1184 mmio + ATA_DMA_STATUS);
1185
1186 post_stat = readb(mmio + ATA_DMA_STATUS);
1187 } else {
1188 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
1189 outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
1190 ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
1191
1192 post_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
1193 }
1194
1195 if (ata_msg_intr(ap))
1196 printk(KERN_INFO "%s: irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
1197 __FUNCTION__,
1198 host_stat, post_stat, status);
1199
1200 return status;
1201 }
1202
1203 static inline int ata_try_flush_cache(const struct ata_device *dev)
1204 {
1205 return ata_id_wcache_enabled(dev->id) ||
1206 ata_id_has_flush(dev->id) ||
1207 ata_id_has_flush_ext(dev->id);
1208 }
1209
1210 static inline unsigned int ac_err_mask(u8 status)
1211 {
1212 if (status & (ATA_BUSY | ATA_DRQ))
1213 return AC_ERR_HSM;
1214 if (status & (ATA_ERR | ATA_DF))
1215 return AC_ERR_DEV;
1216 return 0;
1217 }
1218
1219 static inline unsigned int __ac_err_mask(u8 status)
1220 {
1221 unsigned int mask = ac_err_mask(status);
1222 if (mask == 0)
1223 return AC_ERR_OTHER;
1224 return mask;
1225 }
1226
1227 static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev)
1228 {
1229 ap->pad_dma = 0;
1230 ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ,
1231 &ap->pad_dma, GFP_KERNEL);
1232 return (ap->pad == NULL) ? -ENOMEM : 0;
1233 }
1234
1235 static inline void ata_pad_free(struct ata_port *ap, struct device *dev)
1236 {
1237 dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
1238 }
1239
1240 static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
1241 {
1242 return (struct ata_port *) &host->hostdata[0];
1243 }
1244
1245 #endif /* __LINUX_LIBATA_H__ */
CJK support for tty framebuffer vt