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libata: HPA support
[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 ATA_MAX_PORTS = 8,
120 ATA_DEF_QUEUE = 1,
121 /* tag ATA_MAX_QUEUE - 1 is reserved for internal commands */
122 ATA_MAX_QUEUE = 32,
123 ATA_TAG_INTERNAL = ATA_MAX_QUEUE - 1,
124 ATA_MAX_BUS = 2,
125 ATA_DEF_BUSY_WAIT = 10000,
126 ATA_SHORT_PAUSE = (HZ >> 6) + 1,
127
128 ATA_SHT_EMULATED = 1,
129 ATA_SHT_CMD_PER_LUN = 1,
130 ATA_SHT_THIS_ID = -1,
131 ATA_SHT_USE_CLUSTERING = 1,
132
133 /* struct ata_device stuff */
134 ATA_DFLAG_LBA = (1 << 0), /* device supports LBA */
135 ATA_DFLAG_LBA48 = (1 << 1), /* device supports LBA48 */
136 ATA_DFLAG_CDB_INTR = (1 << 2), /* device asserts INTRQ when ready for CDB */
137 ATA_DFLAG_NCQ = (1 << 3), /* device supports NCQ */
138 ATA_DFLAG_FLUSH_EXT = (1 << 4), /* do FLUSH_EXT instead of FLUSH */
139 ATA_DFLAG_CFG_MASK = (1 << 8) - 1,
140
141 ATA_DFLAG_PIO = (1 << 8), /* device limited to PIO mode */
142 ATA_DFLAG_NCQ_OFF = (1 << 9), /* device limited to non-NCQ mode */
143 ATA_DFLAG_SUSPENDED = (1 << 10), /* device suspended */
144 ATA_DFLAG_INIT_MASK = (1 << 16) - 1,
145
146 ATA_DFLAG_DETACH = (1 << 16),
147 ATA_DFLAG_DETACHED = (1 << 17),
148
149 ATA_DEV_UNKNOWN = 0, /* unknown device */
150 ATA_DEV_ATA = 1, /* ATA device */
151 ATA_DEV_ATA_UNSUP = 2, /* ATA device (unsupported) */
152 ATA_DEV_ATAPI = 3, /* ATAPI device */
153 ATA_DEV_ATAPI_UNSUP = 4, /* ATAPI device (unsupported) */
154 ATA_DEV_NONE = 5, /* no device */
155
156 /* struct ata_port flags */
157 ATA_FLAG_SLAVE_POSS = (1 << 0), /* host supports slave dev */
158 /* (doesn't imply presence) */
159 ATA_FLAG_SATA = (1 << 1),
160 ATA_FLAG_NO_LEGACY = (1 << 2), /* no legacy mode check */
161 ATA_FLAG_MMIO = (1 << 3), /* use MMIO, not PIO */
162 ATA_FLAG_SRST = (1 << 4), /* (obsolete) use ATA SRST, not E.D.D. */
163 ATA_FLAG_SATA_RESET = (1 << 5), /* (obsolete) use COMRESET */
164 ATA_FLAG_NO_ATAPI = (1 << 6), /* No ATAPI support */
165 ATA_FLAG_PIO_DMA = (1 << 7), /* PIO cmds via DMA */
166 ATA_FLAG_PIO_LBA48 = (1 << 8), /* Host DMA engine is LBA28 only */
167 ATA_FLAG_PIO_POLLING = (1 << 9), /* use polling PIO if LLD
168 * doesn't handle PIO interrupts */
169 ATA_FLAG_NCQ = (1 << 10), /* host supports NCQ */
170 ATA_FLAG_HRST_TO_RESUME = (1 << 11), /* hardreset to resume phy */
171 ATA_FLAG_SKIP_D2H_BSY = (1 << 12), /* can't wait for the first D2H
172 * Register FIS clearing BSY */
173 ATA_FLAG_DEBUGMSG = (1 << 13),
174 ATA_FLAG_SETXFER_POLLING= (1 << 14), /* use polling for SETXFER */
175 ATA_FLAG_IGN_SIMPLEX = (1 << 15), /* ignore SIMPLEX */
176 ATA_FLAG_NO_IORDY = (1 << 16), /* controller lacks iordy */
177
178 /* The following flag belongs to ap->pflags but is kept in
179 * ap->flags because it's referenced in many LLDs and will be
180 * removed in not-too-distant future.
181 */
182 ATA_FLAG_DISABLED = (1 << 23), /* port is disabled, ignore it */
183
184 /* bits 24:31 of ap->flags are reserved for LLD specific flags */
185
186 /* struct ata_port pflags */
187 ATA_PFLAG_EH_PENDING = (1 << 0), /* EH pending */
188 ATA_PFLAG_EH_IN_PROGRESS = (1 << 1), /* EH in progress */
189 ATA_PFLAG_FROZEN = (1 << 2), /* port is frozen */
190 ATA_PFLAG_RECOVERED = (1 << 3), /* recovery action performed */
191 ATA_PFLAG_LOADING = (1 << 4), /* boot/loading probe */
192 ATA_PFLAG_UNLOADING = (1 << 5), /* module is unloading */
193 ATA_PFLAG_SCSI_HOTPLUG = (1 << 6), /* SCSI hotplug scheduled */
194
195 ATA_PFLAG_FLUSH_PORT_TASK = (1 << 16), /* flush port task */
196 ATA_PFLAG_SUSPENDED = (1 << 17), /* port is suspended (power) */
197 ATA_PFLAG_PM_PENDING = (1 << 18), /* PM operation pending */
198
199 /* struct ata_queued_cmd flags */
200 ATA_QCFLAG_ACTIVE = (1 << 0), /* cmd not yet ack'd to scsi lyer */
201 ATA_QCFLAG_SG = (1 << 1), /* have s/g table? */
202 ATA_QCFLAG_SINGLE = (1 << 2), /* no s/g, just a single buffer */
203 ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
204 ATA_QCFLAG_IO = (1 << 3), /* standard IO command */
205 ATA_QCFLAG_RESULT_TF = (1 << 4), /* result TF requested */
206
207 ATA_QCFLAG_FAILED = (1 << 16), /* cmd failed and is owned by EH */
208 ATA_QCFLAG_SENSE_VALID = (1 << 17), /* sense data valid */
209 ATA_QCFLAG_EH_SCHEDULED = (1 << 18), /* EH scheduled (obsolete) */
210
211 /* host set flags */
212 ATA_HOST_SIMPLEX = (1 << 0), /* Host is simplex, one DMA channel per host only */
213 ATA_HOST_STARTED = (1 << 1), /* Host started */
214
215 /* various lengths of time */
216 ATA_TMOUT_BOOT = 30 * HZ, /* heuristic */
217 ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* heuristic */
218 ATA_TMOUT_INTERNAL = 30 * HZ,
219 ATA_TMOUT_INTERNAL_QUICK = 5 * HZ,
220
221 /* ATA bus states */
222 BUS_UNKNOWN = 0,
223 BUS_DMA = 1,
224 BUS_IDLE = 2,
225 BUS_NOINTR = 3,
226 BUS_NODATA = 4,
227 BUS_TIMER = 5,
228 BUS_PIO = 6,
229 BUS_EDD = 7,
230 BUS_IDENTIFY = 8,
231 BUS_PACKET = 9,
232
233 /* SATA port states */
234 PORT_UNKNOWN = 0,
235 PORT_ENABLED = 1,
236 PORT_DISABLED = 2,
237
238 /* encoding various smaller bitmaps into a single
239 * unsigned int bitmap
240 */
241 ATA_BITS_PIO = 7,
242 ATA_BITS_MWDMA = 5,
243 ATA_BITS_UDMA = 8,
244
245 ATA_SHIFT_PIO = 0,
246 ATA_SHIFT_MWDMA = ATA_SHIFT_PIO + ATA_BITS_PIO,
247 ATA_SHIFT_UDMA = ATA_SHIFT_MWDMA + ATA_BITS_MWDMA,
248
249 ATA_MASK_PIO = ((1 << ATA_BITS_PIO) - 1) << ATA_SHIFT_PIO,
250 ATA_MASK_MWDMA = ((1 << ATA_BITS_MWDMA) - 1) << ATA_SHIFT_MWDMA,
251 ATA_MASK_UDMA = ((1 << ATA_BITS_UDMA) - 1) << ATA_SHIFT_UDMA,
252
253 /* size of buffer to pad xfers ending on unaligned boundaries */
254 ATA_DMA_PAD_SZ = 4,
255 ATA_DMA_PAD_BUF_SZ = ATA_DMA_PAD_SZ * ATA_MAX_QUEUE,
256
257 /* masks for port functions */
258 ATA_PORT_PRIMARY = (1 << 0),
259 ATA_PORT_SECONDARY = (1 << 1),
260
261 /* ering size */
262 ATA_ERING_SIZE = 32,
263
264 /* desc_len for ata_eh_info and context */
265 ATA_EH_DESC_LEN = 80,
266
267 /* reset / recovery action types */
268 ATA_EH_REVALIDATE = (1 << 0),
269 ATA_EH_SOFTRESET = (1 << 1),
270 ATA_EH_HARDRESET = (1 << 2),
271 ATA_EH_SUSPEND = (1 << 3),
272 ATA_EH_RESUME = (1 << 4),
273 ATA_EH_PM_FREEZE = (1 << 5),
274
275 ATA_EH_RESET_MASK = ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
276 ATA_EH_PERDEV_MASK = ATA_EH_REVALIDATE | ATA_EH_SUSPEND |
277 ATA_EH_RESUME | ATA_EH_PM_FREEZE,
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_RESET = (1 << 16), /* already reset this port */
286 ATA_EHI_PRINTINFO = (1 << 17), /* print configuration info */
287 ATA_EHI_SETMODE = (1 << 18), /* configure transfer mode */
288 ATA_EHI_POST_SETMODE = (1 << 19), /* revaildating after setmode */
289
290 ATA_EHI_RESET_MODIFIER_MASK = ATA_EHI_RESUME_LINK,
291
292 /* max repeat if error condition is still set after ->error_handler */
293 ATA_EH_MAX_REPEAT = 5,
294
295 /* how hard are we gonna try to probe/recover devices */
296 ATA_PROBE_MAX_TRIES = 3,
297 ATA_EH_RESET_TRIES = 3,
298 ATA_EH_DEV_TRIES = 3,
299
300 /* Drive spinup time (time from power-on to the first D2H FIS)
301 * in msecs - 8s currently. Failing to get ready in this time
302 * isn't critical. It will result in reset failure for
303 * controllers which can't wait for the first D2H FIS. libata
304 * will retry, so it just has to be long enough to spin up
305 * most devices.
306 */
307 ATA_SPINUP_WAIT = 8000,
308
309 /* Horkage types. May be set by libata or controller on drives
310 (some horkage may be drive/controller pair dependant */
311
312 ATA_HORKAGE_DIAGNOSTIC = (1 << 0), /* Failed boot diag */
313 ATA_HORKAGE_NODMA = (1 << 1), /* DMA problems */
314 ATA_HORKAGE_NONCQ = (1 << 2), /* Don't use NCQ */
315 ATA_HORKAGE_MAX_SEC_128 = (1 << 3), /* Limit max sects to 128 */
316 ATA_HORKAGE_DMA_RW_ONLY = (1 << 4), /* ATAPI DMA for RW only */
317 };
318
319 enum hsm_task_states {
320 HSM_ST_IDLE, /* no command on going */
321 HSM_ST_FIRST, /* (waiting the device to)
322 write CDB or first data block */
323 HSM_ST, /* (waiting the device to) transfer data */
324 HSM_ST_LAST, /* (waiting the device to) complete command */
325 HSM_ST_ERR, /* error */
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 AC_ERR_NODEV_HINT = (1 << 9), /* polling device detection hint */
339 };
340
341 /* forward declarations */
342 struct scsi_device;
343 struct ata_port_operations;
344 struct ata_port;
345 struct ata_queued_cmd;
346
347 /* typedefs */
348 typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
349 typedef int (*ata_prereset_fn_t)(struct ata_port *ap);
350 typedef int (*ata_reset_fn_t)(struct ata_port *ap, unsigned int *classes);
351 typedef void (*ata_postreset_fn_t)(struct ata_port *ap, unsigned int *classes);
352
353 struct ata_ioports {
354 void __iomem *cmd_addr;
355 void __iomem *data_addr;
356 void __iomem *error_addr;
357 void __iomem *feature_addr;
358 void __iomem *nsect_addr;
359 void __iomem *lbal_addr;
360 void __iomem *lbam_addr;
361 void __iomem *lbah_addr;
362 void __iomem *device_addr;
363 void __iomem *status_addr;
364 void __iomem *command_addr;
365 void __iomem *altstatus_addr;
366 void __iomem *ctl_addr;
367 void __iomem *bmdma_addr;
368 void __iomem *scr_addr;
369 };
370
371 struct ata_host {
372 spinlock_t lock;
373 struct device *dev;
374 unsigned long irq;
375 unsigned long irq2;
376 void __iomem * const *iomap;
377 unsigned int n_ports;
378 void *private_data;
379 const struct ata_port_operations *ops;
380 unsigned long flags;
381 struct ata_port *simplex_claimed; /* channel owning the DMA */
382 struct ata_port *ports[0];
383 };
384
385 struct ata_queued_cmd {
386 struct ata_port *ap;
387 struct ata_device *dev;
388
389 struct scsi_cmnd *scsicmd;
390 void (*scsidone)(struct scsi_cmnd *);
391
392 struct ata_taskfile tf;
393 u8 cdb[ATAPI_CDB_LEN];
394
395 unsigned long flags; /* ATA_QCFLAG_xxx */
396 unsigned int tag;
397 unsigned int n_elem;
398 unsigned int orig_n_elem;
399
400 int dma_dir;
401
402 unsigned int pad_len;
403 unsigned int sect_size;
404
405 unsigned int nbytes;
406 unsigned int curbytes;
407
408 unsigned int cursg;
409 unsigned int cursg_ofs;
410
411 struct scatterlist sgent;
412 struct scatterlist pad_sgent;
413 void *buf_virt;
414
415 /* DO NOT iterate over __sg manually, use ata_for_each_sg() */
416 struct scatterlist *__sg;
417
418 unsigned int err_mask;
419 struct ata_taskfile result_tf;
420 ata_qc_cb_t complete_fn;
421
422 void *private_data;
423 };
424
425 struct ata_port_stats {
426 unsigned long unhandled_irq;
427 unsigned long idle_irq;
428 unsigned long rw_reqbuf;
429 };
430
431 struct ata_ering_entry {
432 int is_io;
433 unsigned int err_mask;
434 u64 timestamp;
435 };
436
437 struct ata_ering {
438 int cursor;
439 struct ata_ering_entry ring[ATA_ERING_SIZE];
440 };
441
442 struct ata_device {
443 struct ata_port *ap;
444 unsigned int devno; /* 0 or 1 */
445 unsigned long flags; /* ATA_DFLAG_xxx */
446 struct scsi_device *sdev; /* attached SCSI device */
447 /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
448 u64 n_sectors; /* size of device, if ATA */
449 u64 n_sectors_boot; /* size of ATA device at startup */
450 unsigned int class; /* ATA_DEV_xxx */
451 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
452 u8 pio_mode;
453 u8 dma_mode;
454 u8 xfer_mode;
455 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
456
457 unsigned int multi_count; /* sectors count for
458 READ/WRITE MULTIPLE */
459 unsigned int max_sectors; /* per-device max sectors */
460 unsigned int cdb_len;
461
462 /* per-dev xfer mask */
463 unsigned int pio_mask;
464 unsigned int mwdma_mask;
465 unsigned int udma_mask;
466
467 /* for CHS addressing */
468 u16 cylinders; /* Number of cylinders */
469 u16 heads; /* Number of heads */
470 u16 sectors; /* Number of sectors per track */
471
472 /* error history */
473 struct ata_ering ering;
474 int spdn_cnt;
475 unsigned int horkage; /* List of broken features */
476 #ifdef CONFIG_SATA_ACPI
477 /* ACPI objects info */
478 acpi_handle obj_handle;
479 #endif
480 };
481
482 /* Offset into struct ata_device. Fields above it are maintained
483 * acress device init. Fields below are zeroed.
484 */
485 #define ATA_DEVICE_CLEAR_OFFSET offsetof(struct ata_device, n_sectors)
486
487 struct ata_eh_info {
488 struct ata_device *dev; /* offending device */
489 u32 serror; /* SError from LLDD */
490 unsigned int err_mask; /* port-wide err_mask */
491 unsigned int action; /* ATA_EH_* action mask */
492 unsigned int dev_action[ATA_MAX_DEVICES]; /* dev EH action */
493 unsigned int flags; /* ATA_EHI_* flags */
494
495 unsigned long hotplug_timestamp;
496 unsigned int probe_mask;
497
498 char desc[ATA_EH_DESC_LEN];
499 int desc_len;
500 };
501
502 struct ata_eh_context {
503 struct ata_eh_info i;
504 int tries[ATA_MAX_DEVICES];
505 unsigned int classes[ATA_MAX_DEVICES];
506 unsigned int did_probe_mask;
507 };
508
509 struct ata_port {
510 struct Scsi_Host *scsi_host; /* our co-allocated scsi host */
511 const struct ata_port_operations *ops;
512 spinlock_t *lock;
513 unsigned long flags; /* ATA_FLAG_xxx */
514 unsigned int pflags; /* ATA_PFLAG_xxx */
515 unsigned int print_id; /* user visible unique port ID */
516 unsigned int port_no; /* 0 based port no. inside the host */
517
518 struct ata_prd *prd; /* our SG list */
519 dma_addr_t prd_dma; /* and its DMA mapping */
520
521 void *pad; /* array of DMA pad buffers */
522 dma_addr_t pad_dma;
523
524 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
525
526 u8 ctl; /* cache of ATA control register */
527 u8 last_ctl; /* Cache last written value */
528 unsigned int pio_mask;
529 unsigned int mwdma_mask;
530 unsigned int udma_mask;
531 unsigned int cbl; /* cable type; ATA_CBL_xxx */
532 unsigned int hw_sata_spd_limit;
533 unsigned int sata_spd_limit; /* SATA PHY speed limit */
534
535 /* record runtime error info, protected by host lock */
536 struct ata_eh_info eh_info;
537 /* EH context owned by EH */
538 struct ata_eh_context eh_context;
539
540 struct ata_device device[ATA_MAX_DEVICES];
541
542 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
543 unsigned long qc_allocated;
544 unsigned int qc_active;
545
546 unsigned int active_tag;
547 u32 sactive;
548
549 struct ata_port_stats stats;
550 struct ata_host *host;
551 struct device *dev;
552
553 void *port_task_data;
554 struct delayed_work port_task;
555 struct delayed_work hotplug_task;
556 struct work_struct scsi_rescan_task;
557
558 unsigned int hsm_task_state;
559
560 u32 msg_enable;
561 struct list_head eh_done_q;
562 wait_queue_head_t eh_wait_q;
563
564 pm_message_t pm_mesg;
565 int *pm_result;
566
567 void *private_data;
568
569 u8 sector_buf[ATA_SECT_SIZE]; /* owned by EH */
570 };
571
572 struct ata_port_operations {
573 void (*port_disable) (struct ata_port *);
574
575 void (*dev_config) (struct ata_device *);
576
577 void (*set_piomode) (struct ata_port *, struct ata_device *);
578 void (*set_dmamode) (struct ata_port *, struct ata_device *);
579 unsigned long (*mode_filter) (struct ata_device *, unsigned long);
580
581 void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
582 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
583
584 void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
585 u8 (*check_status)(struct ata_port *ap);
586 u8 (*check_altstatus)(struct ata_port *ap);
587 void (*dev_select)(struct ata_port *ap, unsigned int device);
588
589 void (*phy_reset) (struct ata_port *ap); /* obsolete */
590 int (*set_mode) (struct ata_port *ap, struct ata_device **r_failed_dev);
591
592 void (*post_set_mode) (struct ata_port *ap);
593
594 int (*cable_detect) (struct ata_port *ap);
595
596 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
597
598 void (*bmdma_setup) (struct ata_queued_cmd *qc);
599 void (*bmdma_start) (struct ata_queued_cmd *qc);
600
601 void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
602
603 void (*qc_prep) (struct ata_queued_cmd *qc);
604 unsigned int (*qc_issue) (struct ata_queued_cmd *qc);
605
606 /* Error handlers. ->error_handler overrides ->eng_timeout and
607 * indicates that new-style EH is in place.
608 */
609 void (*eng_timeout) (struct ata_port *ap); /* obsolete */
610
611 void (*freeze) (struct ata_port *ap);
612 void (*thaw) (struct ata_port *ap);
613 void (*error_handler) (struct ata_port *ap);
614 void (*post_internal_cmd) (struct ata_queued_cmd *qc);
615
616 irq_handler_t irq_handler;
617 void (*irq_clear) (struct ata_port *);
618 u8 (*irq_on) (struct ata_port *);
619 u8 (*irq_ack) (struct ata_port *ap, unsigned int chk_drq);
620
621 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
622 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
623 u32 val);
624
625 int (*port_suspend) (struct ata_port *ap, pm_message_t mesg);
626 int (*port_resume) (struct ata_port *ap);
627
628 int (*port_start) (struct ata_port *ap);
629 void (*port_stop) (struct ata_port *ap);
630
631 void (*host_stop) (struct ata_host *host);
632
633 void (*bmdma_stop) (struct ata_queued_cmd *qc);
634 u8 (*bmdma_status) (struct ata_port *ap);
635 };
636
637 struct ata_port_info {
638 struct scsi_host_template *sht;
639 unsigned long flags;
640 unsigned long pio_mask;
641 unsigned long mwdma_mask;
642 unsigned long udma_mask;
643 const struct ata_port_operations *port_ops;
644 irq_handler_t irq_handler;
645 void *private_data;
646 };
647
648 struct ata_timing {
649 unsigned short mode; /* ATA mode */
650 unsigned short setup; /* t1 */
651 unsigned short act8b; /* t2 for 8-bit I/O */
652 unsigned short rec8b; /* t2i for 8-bit I/O */
653 unsigned short cyc8b; /* t0 for 8-bit I/O */
654 unsigned short active; /* t2 or tD */
655 unsigned short recover; /* t2i or tK */
656 unsigned short cycle; /* t0 */
657 unsigned short udma; /* t2CYCTYP/2 */
658 };
659
660 #define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
661
662 extern const unsigned long sata_deb_timing_normal[];
663 extern const unsigned long sata_deb_timing_hotplug[];
664 extern const unsigned long sata_deb_timing_long[];
665
666 extern const struct ata_port_operations ata_dummy_port_ops;
667 extern const struct ata_port_info ata_dummy_port_info;
668
669 static inline const unsigned long *
670 sata_ehc_deb_timing(struct ata_eh_context *ehc)
671 {
672 if (ehc->i.flags & ATA_EHI_HOTPLUGGED)
673 return sata_deb_timing_hotplug;
674 else
675 return sata_deb_timing_normal;
676 }
677
678 static inline int ata_port_is_dummy(struct ata_port *ap)
679 {
680 return ap->ops == &ata_dummy_port_ops;
681 }
682
683 extern void sata_print_link_status(struct ata_port *ap);
684 extern void ata_port_probe(struct ata_port *);
685 extern void __sata_phy_reset(struct ata_port *ap);
686 extern void sata_phy_reset(struct ata_port *ap);
687 extern void ata_bus_reset(struct ata_port *ap);
688 extern int sata_set_spd(struct ata_port *ap);
689 extern int sata_phy_debounce(struct ata_port *ap, const unsigned long *param);
690 extern int sata_phy_resume(struct ata_port *ap, const unsigned long *param);
691 extern int ata_std_prereset(struct ata_port *ap);
692 extern int ata_std_softreset(struct ata_port *ap, unsigned int *classes);
693 extern int sata_port_hardreset(struct ata_port *ap,
694 const unsigned long *timing);
695 extern int sata_std_hardreset(struct ata_port *ap, unsigned int *class);
696 extern void ata_std_postreset(struct ata_port *ap, unsigned int *classes);
697 extern void ata_port_disable(struct ata_port *);
698 extern void ata_std_ports(struct ata_ioports *ioaddr);
699 #ifdef CONFIG_PCI
700 extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
701 unsigned int n_ports);
702 extern void ata_pci_remove_one (struct pci_dev *pdev);
703 #ifdef CONFIG_PM
704 extern void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg);
705 extern int __must_check ata_pci_device_do_resume(struct pci_dev *pdev);
706 extern int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
707 extern int ata_pci_device_resume(struct pci_dev *pdev);
708 #endif
709 extern int ata_pci_clear_simplex(struct pci_dev *pdev);
710 #endif /* CONFIG_PCI */
711 extern struct ata_host *ata_host_alloc(struct device *dev, int max_ports);
712 extern struct ata_host *ata_host_alloc_pinfo(struct device *dev,
713 const struct ata_port_info * const * ppi, int n_ports);
714 extern int ata_host_start(struct ata_host *host);
715 extern int ata_host_register(struct ata_host *host,
716 struct scsi_host_template *sht);
717 extern int ata_host_activate(struct ata_host *host, int irq,
718 irq_handler_t irq_handler, unsigned long irq_flags,
719 struct scsi_host_template *sht);
720 extern void ata_host_detach(struct ata_host *host);
721 extern void ata_host_init(struct ata_host *, struct device *,
722 unsigned long, const struct ata_port_operations *);
723 extern int ata_scsi_detect(struct scsi_host_template *sht);
724 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
725 extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
726 extern void ata_sas_port_destroy(struct ata_port *);
727 extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
728 struct ata_port_info *, struct Scsi_Host *);
729 extern int ata_sas_port_init(struct ata_port *);
730 extern int ata_sas_port_start(struct ata_port *ap);
731 extern void ata_sas_port_stop(struct ata_port *ap);
732 extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
733 extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
734 struct ata_port *ap);
735 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
736 extern int sata_scr_valid(struct ata_port *ap);
737 extern int sata_scr_read(struct ata_port *ap, int reg, u32 *val);
738 extern int sata_scr_write(struct ata_port *ap, int reg, u32 val);
739 extern int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val);
740 extern int ata_port_online(struct ata_port *ap);
741 extern int ata_port_offline(struct ata_port *ap);
742 #ifdef CONFIG_PM
743 extern int ata_scsi_device_resume(struct scsi_device *);
744 extern int ata_scsi_device_suspend(struct scsi_device *, pm_message_t mesg);
745 extern int ata_host_suspend(struct ata_host *host, pm_message_t mesg);
746 extern void ata_host_resume(struct ata_host *host);
747 #endif
748 extern int ata_ratelimit(void);
749 extern int ata_busy_sleep(struct ata_port *ap,
750 unsigned long timeout_pat, unsigned long timeout);
751 extern void ata_port_queue_task(struct ata_port *ap, work_func_t fn,
752 void *data, unsigned long delay);
753 extern u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
754 unsigned long interval_msec,
755 unsigned long timeout_msec);
756 extern unsigned int ata_dev_try_classify(struct ata_port *, unsigned int, u8 *);
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_dev_disable(struct ata_device *adev);
785 extern void ata_id_string(const u16 *id, unsigned char *s,
786 unsigned int ofs, unsigned int len);
787 extern void ata_id_c_string(const u16 *id, unsigned char *s,
788 unsigned int ofs, unsigned int len);
789 extern void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown);
790 extern unsigned long ata_device_blacklisted(const struct ata_device *dev);
791 extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
792 extern void ata_bmdma_start (struct ata_queued_cmd *qc);
793 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
794 extern u8 ata_bmdma_status(struct ata_port *ap);
795 extern void ata_bmdma_irq_clear(struct ata_port *ap);
796 extern void ata_bmdma_freeze(struct ata_port *ap);
797 extern void ata_bmdma_thaw(struct ata_port *ap);
798 extern void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
799 ata_reset_fn_t softreset,
800 ata_reset_fn_t hardreset,
801 ata_postreset_fn_t postreset);
802 extern void ata_bmdma_error_handler(struct ata_port *ap);
803 extern void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc);
804 extern int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
805 u8 status, int in_wq);
806 extern void ata_qc_complete(struct ata_queued_cmd *qc);
807 extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
808 void (*finish_qc)(struct ata_queued_cmd *));
809 extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
810 void (*done)(struct scsi_cmnd *));
811 extern int ata_std_bios_param(struct scsi_device *sdev,
812 struct block_device *bdev,
813 sector_t capacity, int geom[]);
814 extern int ata_scsi_slave_config(struct scsi_device *sdev);
815 extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
816 extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
817 int queue_depth);
818 extern struct ata_device *ata_dev_pair(struct ata_device *adev);
819 extern int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev);
820 extern u8 ata_irq_on(struct ata_port *ap);
821 extern u8 ata_dummy_irq_on(struct ata_port *ap);
822 extern u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq);
823 extern u8 ata_dummy_irq_ack(struct ata_port *ap, unsigned int chk_drq);
824
825 extern int ata_cable_40wire(struct ata_port *ap);
826 extern int ata_cable_80wire(struct ata_port *ap);
827 extern int ata_cable_sata(struct ata_port *ap);
828 extern int ata_cable_unknown(struct ata_port *ap);
829
830 /*
831 * Timing helpers
832 */
833
834 extern unsigned int ata_pio_need_iordy(const struct ata_device *);
835 extern int ata_timing_compute(struct ata_device *, unsigned short,
836 struct ata_timing *, int, int);
837 extern void ata_timing_merge(const struct ata_timing *,
838 const struct ata_timing *, struct ata_timing *,
839 unsigned int);
840
841 enum {
842 ATA_TIMING_SETUP = (1 << 0),
843 ATA_TIMING_ACT8B = (1 << 1),
844 ATA_TIMING_REC8B = (1 << 2),
845 ATA_TIMING_CYC8B = (1 << 3),
846 ATA_TIMING_8BIT = ATA_TIMING_ACT8B | ATA_TIMING_REC8B |
847 ATA_TIMING_CYC8B,
848 ATA_TIMING_ACTIVE = (1 << 4),
849 ATA_TIMING_RECOVER = (1 << 5),
850 ATA_TIMING_CYCLE = (1 << 6),
851 ATA_TIMING_UDMA = (1 << 7),
852 ATA_TIMING_ALL = ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
853 ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
854 ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
855 ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
856 };
857
858
859 #ifdef CONFIG_PCI
860 struct pci_bits {
861 unsigned int reg; /* PCI config register to read */
862 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
863 unsigned long mask;
864 unsigned long val;
865 };
866
867 extern int ata_pci_init_native_host(struct ata_host *host,
868 unsigned int port_mask);
869 extern int ata_pci_prepare_native_host(struct pci_dev *pdev,
870 const struct ata_port_info * const * ppi,
871 int n_ports, struct ata_host **r_host);
872 extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);
873 extern unsigned long ata_pci_default_filter(struct ata_device *, unsigned long);
874 #endif /* CONFIG_PCI */
875
876 /*
877 * EH
878 */
879 extern void ata_eng_timeout(struct ata_port *ap);
880
881 extern void ata_port_schedule_eh(struct ata_port *ap);
882 extern int ata_port_abort(struct ata_port *ap);
883 extern int ata_port_freeze(struct ata_port *ap);
884
885 extern void ata_eh_freeze_port(struct ata_port *ap);
886 extern void ata_eh_thaw_port(struct ata_port *ap);
887
888 extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
889 extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
890
891 extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
892 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
893 ata_postreset_fn_t postreset);
894
895 /*
896 * printk helpers
897 */
898 #define ata_port_printk(ap, lv, fmt, args...) \
899 printk(lv"ata%u: "fmt, (ap)->print_id , ##args)
900
901 #define ata_dev_printk(dev, lv, fmt, args...) \
902 printk(lv"ata%u.%02u: "fmt, (dev)->ap->print_id, (dev)->devno , ##args)
903
904 /*
905 * ata_eh_info helpers
906 */
907 #define ata_ehi_push_desc(ehi, fmt, args...) do { \
908 (ehi)->desc_len += scnprintf((ehi)->desc + (ehi)->desc_len, \
909 ATA_EH_DESC_LEN - (ehi)->desc_len, \
910 fmt , ##args); \
911 } while (0)
912
913 #define ata_ehi_clear_desc(ehi) do { \
914 (ehi)->desc[0] = '\0'; \
915 (ehi)->desc_len = 0; \
916 } while (0)
917
918 static inline void __ata_ehi_hotplugged(struct ata_eh_info *ehi)
919 {
920 if (ehi->flags & ATA_EHI_HOTPLUGGED)
921 return;
922
923 ehi->flags |= ATA_EHI_HOTPLUGGED | ATA_EHI_RESUME_LINK;
924 ehi->hotplug_timestamp = jiffies;
925
926 ehi->action |= ATA_EH_SOFTRESET;
927 ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
928 }
929
930 static inline void ata_ehi_hotplugged(struct ata_eh_info *ehi)
931 {
932 __ata_ehi_hotplugged(ehi);
933 ehi->err_mask |= AC_ERR_ATA_BUS;
934 }
935
936 /*
937 * qc helpers
938 */
939 static inline int
940 ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
941 {
942 if (sg == &qc->pad_sgent)
943 return 1;
944 if (qc->pad_len)
945 return 0;
946 if (((sg - qc->__sg) + 1) == qc->n_elem)
947 return 1;
948 return 0;
949 }
950
951 static inline struct scatterlist *
952 ata_qc_first_sg(struct ata_queued_cmd *qc)
953 {
954 if (qc->n_elem)
955 return qc->__sg;
956 if (qc->pad_len)
957 return &qc->pad_sgent;
958 return NULL;
959 }
960
961 static inline struct scatterlist *
962 ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
963 {
964 if (sg == &qc->pad_sgent)
965 return NULL;
966 if (++sg - qc->__sg < qc->n_elem)
967 return sg;
968 if (qc->pad_len)
969 return &qc->pad_sgent;
970 return NULL;
971 }
972
973 #define ata_for_each_sg(sg, qc) \
974 for (sg = ata_qc_first_sg(qc); sg; sg = ata_qc_next_sg(sg, qc))
975
976 static inline unsigned int ata_tag_valid(unsigned int tag)
977 {
978 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
979 }
980
981 static inline unsigned int ata_tag_internal(unsigned int tag)
982 {
983 return tag == ATA_MAX_QUEUE - 1;
984 }
985
986 /*
987 * device helpers
988 */
989 static inline unsigned int ata_class_enabled(unsigned int class)
990 {
991 return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI;
992 }
993
994 static inline unsigned int ata_class_disabled(unsigned int class)
995 {
996 return class == ATA_DEV_ATA_UNSUP || class == ATA_DEV_ATAPI_UNSUP;
997 }
998
999 static inline unsigned int ata_class_absent(unsigned int class)
1000 {
1001 return !ata_class_enabled(class) && !ata_class_disabled(class);
1002 }
1003
1004 static inline unsigned int ata_dev_enabled(const struct ata_device *dev)
1005 {
1006 return ata_class_enabled(dev->class);
1007 }
1008
1009 static inline unsigned int ata_dev_disabled(const struct ata_device *dev)
1010 {
1011 return ata_class_disabled(dev->class);
1012 }
1013
1014 static inline unsigned int ata_dev_absent(const struct ata_device *dev)
1015 {
1016 return ata_class_absent(dev->class);
1017 }
1018
1019 static inline unsigned int ata_dev_ready(const struct ata_device *dev)
1020 {
1021 return ata_dev_enabled(dev) && !(dev->flags & ATA_DFLAG_SUSPENDED);
1022 }
1023
1024 /*
1025 * port helpers
1026 */
1027 static inline int ata_port_max_devices(const struct ata_port *ap)
1028 {
1029 if (ap->flags & ATA_FLAG_SLAVE_POSS)
1030 return 2;
1031 return 1;
1032 }
1033
1034
1035 static inline u8 ata_chk_status(struct ata_port *ap)
1036 {
1037 return ap->ops->check_status(ap);
1038 }
1039
1040 /**
1041 * ata_ncq_enabled - Test whether NCQ is enabled
1042 * @dev: ATA device to test for
1043 *
1044 * LOCKING:
1045 * spin_lock_irqsave(host lock)
1046 *
1047 * RETURNS:
1048 * 1 if NCQ is enabled for @dev, 0 otherwise.
1049 */
1050 static inline int ata_ncq_enabled(struct ata_device *dev)
1051 {
1052 return (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
1053 ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ;
1054 }
1055
1056 /**
1057 * ata_pause - Flush writes and pause 400 nanoseconds.
1058 * @ap: Port to wait for.
1059 *
1060 * LOCKING:
1061 * Inherited from caller.
1062 */
1063
1064 static inline void ata_pause(struct ata_port *ap)
1065 {
1066 ata_altstatus(ap);
1067 ndelay(400);
1068 }
1069
1070
1071 /**
1072 * ata_busy_wait - Wait for a port status register
1073 * @ap: Port to wait for.
1074 * @bits: bits that must be clear
1075 * @max: number of 10uS waits to perform
1076 *
1077 * Waits up to max*10 microseconds for the selected bits in the port's
1078 * status register to be cleared.
1079 * Returns final value of status register.
1080 *
1081 * LOCKING:
1082 * Inherited from caller.
1083 */
1084
1085 static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
1086 unsigned int max)
1087 {
1088 u8 status;
1089
1090 do {
1091 udelay(10);
1092 status = ata_chk_status(ap);
1093 max--;
1094 } while (status != 0xff && (status & bits) && (max > 0));
1095
1096 return status;
1097 }
1098
1099
1100 /**
1101 * ata_wait_idle - Wait for a port to be idle.
1102 * @ap: Port to wait for.
1103 *
1104 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
1105 * Returns final value of status register.
1106 *
1107 * LOCKING:
1108 * Inherited from caller.
1109 */
1110
1111 static inline u8 ata_wait_idle(struct ata_port *ap)
1112 {
1113 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
1114
1115 if (status != 0xff && (status & (ATA_BUSY | ATA_DRQ))) {
1116 if (ata_msg_warn(ap))
1117 printk(KERN_WARNING "ATA: abnormal status 0x%X on port 0x%p\n",
1118 status, ap->ioaddr.status_addr);
1119 }
1120
1121 return status;
1122 }
1123
1124 static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
1125 {
1126 qc->tf.ctl |= ATA_NIEN;
1127 }
1128
1129 static inline struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
1130 unsigned int tag)
1131 {
1132 if (likely(ata_tag_valid(tag)))
1133 return &ap->qcmd[tag];
1134 return NULL;
1135 }
1136
1137 static inline struct ata_queued_cmd *ata_qc_from_tag(struct ata_port *ap,
1138 unsigned int tag)
1139 {
1140 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
1141
1142 if (unlikely(!qc) || !ap->ops->error_handler)
1143 return qc;
1144
1145 if ((qc->flags & (ATA_QCFLAG_ACTIVE |
1146 ATA_QCFLAG_FAILED)) == ATA_QCFLAG_ACTIVE)
1147 return qc;
1148
1149 return NULL;
1150 }
1151
1152 static inline void ata_tf_init(struct ata_device *dev, struct ata_taskfile *tf)
1153 {
1154 memset(tf, 0, sizeof(*tf));
1155
1156 tf->ctl = dev->ap->ctl;
1157 if (dev->devno == 0)
1158 tf->device = ATA_DEVICE_OBS;
1159 else
1160 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
1161 }
1162
1163 static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
1164 {
1165 qc->dma_dir = DMA_NONE;
1166 qc->__sg = NULL;
1167 qc->flags = 0;
1168 qc->cursg = qc->cursg_ofs = 0;
1169 qc->nbytes = qc->curbytes = 0;
1170 qc->n_elem = 0;
1171 qc->err_mask = 0;
1172 qc->pad_len = 0;
1173 qc->sect_size = ATA_SECT_SIZE;
1174
1175 ata_tf_init(qc->dev, &qc->tf);
1176
1177 /* init result_tf such that it indicates normal completion */
1178 qc->result_tf.command = ATA_DRDY;
1179 qc->result_tf.feature = 0;
1180 }
1181
1182 static inline int ata_try_flush_cache(const struct ata_device *dev)
1183 {
1184 return ata_id_wcache_enabled(dev->id) ||
1185 ata_id_has_flush(dev->id) ||
1186 ata_id_has_flush_ext(dev->id);
1187 }
1188
1189 static inline unsigned int ac_err_mask(u8 status)
1190 {
1191 if (status & (ATA_BUSY | ATA_DRQ))
1192 return AC_ERR_HSM;
1193 if (status & (ATA_ERR | ATA_DF))
1194 return AC_ERR_DEV;
1195 return 0;
1196 }
1197
1198 static inline unsigned int __ac_err_mask(u8 status)
1199 {
1200 unsigned int mask = ac_err_mask(status);
1201 if (mask == 0)
1202 return AC_ERR_OTHER;
1203 return mask;
1204 }
1205
1206 static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev)
1207 {
1208 ap->pad_dma = 0;
1209 ap->pad = dmam_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ,
1210 &ap->pad_dma, GFP_KERNEL);
1211 return (ap->pad == NULL) ? -ENOMEM : 0;
1212 }
1213
1214 static inline void ata_pad_free(struct ata_port *ap, struct device *dev)
1215 {
1216 dmam_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
1217 }
1218
1219 static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
1220 {
1221 return *(struct ata_port **)&host->hostdata[0];
1222 }
1223
1224 #endif /* __LINUX_LIBATA_H__ */
Linux kernel - Deliverables
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