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[PATCH] libata: implement per-dev EH action mask eh_info->dev_action[]
[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/io.h>
34 #include <linux/ata.h>
35 #include <linux/workqueue.h>
36 #include <scsi/scsi_host.h>
37
38 /*
39 * compile-time options: to be removed as soon as all the drivers are
40 * converted to the new debugging mechanism
41 */
42 #undef ATA_DEBUG /* debugging output */
43 #undef ATA_VERBOSE_DEBUG /* yet more debugging output */
44 #undef ATA_IRQ_TRAP /* define to ack screaming irqs */
45 #undef ATA_NDEBUG /* define to disable quick runtime checks */
46 #undef ATA_ENABLE_PATA /* define to enable PATA support in some
47 * low-level drivers */
48
49
50 /* note: prints function name for you */
51 #ifdef ATA_DEBUG
52 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
53 #ifdef ATA_VERBOSE_DEBUG
54 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
55 #else
56 #define VPRINTK(fmt, args...)
57 #endif /* ATA_VERBOSE_DEBUG */
58 #else
59 #define DPRINTK(fmt, args...)
60 #define VPRINTK(fmt, args...)
61 #endif /* ATA_DEBUG */
62
63 #define BPRINTK(fmt, args...) if (ap->flags & ATA_FLAG_DEBUGMSG) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
64
65 /* NEW: debug levels */
66 #define HAVE_LIBATA_MSG 1
67
68 enum {
69 ATA_MSG_DRV = 0x0001,
70 ATA_MSG_INFO = 0x0002,
71 ATA_MSG_PROBE = 0x0004,
72 ATA_MSG_WARN = 0x0008,
73 ATA_MSG_MALLOC = 0x0010,
74 ATA_MSG_CTL = 0x0020,
75 ATA_MSG_INTR = 0x0040,
76 ATA_MSG_ERR = 0x0080,
77 };
78
79 #define ata_msg_drv(p) ((p)->msg_enable & ATA_MSG_DRV)
80 #define ata_msg_info(p) ((p)->msg_enable & ATA_MSG_INFO)
81 #define ata_msg_probe(p) ((p)->msg_enable & ATA_MSG_PROBE)
82 #define ata_msg_warn(p) ((p)->msg_enable & ATA_MSG_WARN)
83 #define ata_msg_malloc(p) ((p)->msg_enable & ATA_MSG_MALLOC)
84 #define ata_msg_ctl(p) ((p)->msg_enable & ATA_MSG_CTL)
85 #define ata_msg_intr(p) ((p)->msg_enable & ATA_MSG_INTR)
86 #define ata_msg_err(p) ((p)->msg_enable & ATA_MSG_ERR)
87
88 static inline u32 ata_msg_init(int dval, int default_msg_enable_bits)
89 {
90 if (dval < 0 || dval >= (sizeof(u32) * 8))
91 return default_msg_enable_bits; /* should be 0x1 - only driver info msgs */
92 if (!dval)
93 return 0;
94 return (1 << dval) - 1;
95 }
96
97 /* defines only for the constants which don't work well as enums */
98 #define ATA_TAG_POISON 0xfafbfcfdU
99
100 /* move to PCI layer? */
101 static inline struct device *pci_dev_to_dev(struct pci_dev *pdev)
102 {
103 return &pdev->dev;
104 }
105
106 enum {
107 /* various global constants */
108 LIBATA_MAX_PRD = ATA_MAX_PRD / 2,
109 ATA_MAX_PORTS = 8,
110 ATA_DEF_QUEUE = 1,
111 /* tag ATA_MAX_QUEUE - 1 is reserved for internal commands */
112 ATA_MAX_QUEUE = 32,
113 ATA_TAG_INTERNAL = ATA_MAX_QUEUE - 1,
114 ATA_MAX_SECTORS = 200, /* FIXME */
115 ATA_MAX_SECTORS_LBA48 = 65535,
116 ATA_MAX_BUS = 2,
117 ATA_DEF_BUSY_WAIT = 10000,
118 ATA_SHORT_PAUSE = (HZ >> 6) + 1,
119
120 ATA_SHT_EMULATED = 1,
121 ATA_SHT_CMD_PER_LUN = 1,
122 ATA_SHT_THIS_ID = -1,
123 ATA_SHT_USE_CLUSTERING = 1,
124
125 /* struct ata_device stuff */
126 ATA_DFLAG_LBA = (1 << 0), /* device supports LBA */
127 ATA_DFLAG_LBA48 = (1 << 1), /* device supports LBA48 */
128 ATA_DFLAG_CDB_INTR = (1 << 2), /* device asserts INTRQ when ready for CDB */
129 ATA_DFLAG_NCQ = (1 << 3), /* device supports NCQ */
130 ATA_DFLAG_CFG_MASK = (1 << 8) - 1,
131
132 ATA_DFLAG_PIO = (1 << 8), /* device currently in PIO mode */
133 ATA_DFLAG_INIT_MASK = (1 << 16) - 1,
134
135 ATA_DFLAG_DETACH = (1 << 16),
136 ATA_DFLAG_DETACHED = (1 << 17),
137
138 ATA_DEV_UNKNOWN = 0, /* unknown device */
139 ATA_DEV_ATA = 1, /* ATA device */
140 ATA_DEV_ATA_UNSUP = 2, /* ATA device (unsupported) */
141 ATA_DEV_ATAPI = 3, /* ATAPI device */
142 ATA_DEV_ATAPI_UNSUP = 4, /* ATAPI device (unsupported) */
143 ATA_DEV_NONE = 5, /* no device */
144
145 /* struct ata_port flags */
146 ATA_FLAG_SLAVE_POSS = (1 << 0), /* host supports slave dev */
147 /* (doesn't imply presence) */
148 ATA_FLAG_SATA = (1 << 1),
149 ATA_FLAG_NO_LEGACY = (1 << 2), /* no legacy mode check */
150 ATA_FLAG_MMIO = (1 << 3), /* use MMIO, not PIO */
151 ATA_FLAG_SRST = (1 << 4), /* (obsolete) use ATA SRST, not E.D.D. */
152 ATA_FLAG_SATA_RESET = (1 << 5), /* (obsolete) use COMRESET */
153 ATA_FLAG_NO_ATAPI = (1 << 6), /* No ATAPI support */
154 ATA_FLAG_PIO_DMA = (1 << 7), /* PIO cmds via DMA */
155 ATA_FLAG_PIO_LBA48 = (1 << 8), /* Host DMA engine is LBA28 only */
156 ATA_FLAG_PIO_POLLING = (1 << 9), /* use polling PIO if LLD
157 * doesn't handle PIO interrupts */
158 ATA_FLAG_NCQ = (1 << 10), /* host supports NCQ */
159 ATA_FLAG_HRST_TO_RESUME = (1 << 11), /* hardreset to resume phy */
160 ATA_FLAG_SKIP_D2H_BSY = (1 << 12), /* can't wait for the first D2H
161 * Register FIS clearing BSY */
162
163 ATA_FLAG_DEBUGMSG = (1 << 13),
164 ATA_FLAG_FLUSH_PORT_TASK = (1 << 14), /* flush port task */
165
166 ATA_FLAG_EH_PENDING = (1 << 15), /* EH pending */
167 ATA_FLAG_EH_IN_PROGRESS = (1 << 16), /* EH in progress */
168 ATA_FLAG_FROZEN = (1 << 17), /* port is frozen */
169 ATA_FLAG_RECOVERED = (1 << 18), /* recovery action performed */
170 ATA_FLAG_LOADING = (1 << 19), /* boot/loading probe */
171 ATA_FLAG_UNLOADING = (1 << 20), /* module is unloading */
172 ATA_FLAG_SCSI_HOTPLUG = (1 << 21), /* SCSI hotplug scheduled */
173
174 ATA_FLAG_DISABLED = (1 << 22), /* port is disabled, ignore it */
175 ATA_FLAG_SUSPENDED = (1 << 23), /* port is suspended (power) */
176
177 /* bits 24:31 of ap->flags are reserved for LLDD specific flags */
178
179 /* struct ata_queued_cmd flags */
180 ATA_QCFLAG_ACTIVE = (1 << 0), /* cmd not yet ack'd to scsi lyer */
181 ATA_QCFLAG_SG = (1 << 1), /* have s/g table? */
182 ATA_QCFLAG_SINGLE = (1 << 2), /* no s/g, just a single buffer */
183 ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
184 ATA_QCFLAG_IO = (1 << 3), /* standard IO command */
185 ATA_QCFLAG_RESULT_TF = (1 << 4), /* result TF requested */
186
187 ATA_QCFLAG_FAILED = (1 << 16), /* cmd failed and is owned by EH */
188 ATA_QCFLAG_SENSE_VALID = (1 << 17), /* sense data valid */
189 ATA_QCFLAG_EH_SCHEDULED = (1 << 18), /* EH scheduled (obsolete) */
190
191 /* host set flags */
192 ATA_HOST_SIMPLEX = (1 << 0), /* Host is simplex, one DMA channel per host_set only */
193
194 /* various lengths of time */
195 ATA_TMOUT_BOOT = 30 * HZ, /* heuristic */
196 ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* heuristic */
197 ATA_TMOUT_INTERNAL = 30 * HZ,
198 ATA_TMOUT_INTERNAL_QUICK = 5 * HZ,
199
200 /* ATA bus states */
201 BUS_UNKNOWN = 0,
202 BUS_DMA = 1,
203 BUS_IDLE = 2,
204 BUS_NOINTR = 3,
205 BUS_NODATA = 4,
206 BUS_TIMER = 5,
207 BUS_PIO = 6,
208 BUS_EDD = 7,
209 BUS_IDENTIFY = 8,
210 BUS_PACKET = 9,
211
212 /* SATA port states */
213 PORT_UNKNOWN = 0,
214 PORT_ENABLED = 1,
215 PORT_DISABLED = 2,
216
217 /* encoding various smaller bitmaps into a single
218 * unsigned int bitmap
219 */
220 ATA_BITS_PIO = 5,
221 ATA_BITS_MWDMA = 3,
222 ATA_BITS_UDMA = 8,
223
224 ATA_SHIFT_PIO = 0,
225 ATA_SHIFT_MWDMA = ATA_SHIFT_PIO + ATA_BITS_PIO,
226 ATA_SHIFT_UDMA = ATA_SHIFT_MWDMA + ATA_BITS_MWDMA,
227
228 ATA_MASK_PIO = ((1 << ATA_BITS_PIO) - 1) << ATA_SHIFT_PIO,
229 ATA_MASK_MWDMA = ((1 << ATA_BITS_MWDMA) - 1) << ATA_SHIFT_MWDMA,
230 ATA_MASK_UDMA = ((1 << ATA_BITS_UDMA) - 1) << ATA_SHIFT_UDMA,
231
232 /* size of buffer to pad xfers ending on unaligned boundaries */
233 ATA_DMA_PAD_SZ = 4,
234 ATA_DMA_PAD_BUF_SZ = ATA_DMA_PAD_SZ * ATA_MAX_QUEUE,
235
236 /* masks for port functions */
237 ATA_PORT_PRIMARY = (1 << 0),
238 ATA_PORT_SECONDARY = (1 << 1),
239
240 /* ering size */
241 ATA_ERING_SIZE = 32,
242
243 /* desc_len for ata_eh_info and context */
244 ATA_EH_DESC_LEN = 80,
245
246 /* reset / recovery action types */
247 ATA_EH_REVALIDATE = (1 << 0),
248 ATA_EH_SOFTRESET = (1 << 1),
249 ATA_EH_HARDRESET = (1 << 2),
250
251 ATA_EH_RESET_MASK = ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
252 ATA_EH_PERDEV_MASK = ATA_EH_REVALIDATE,
253
254 /* ata_eh_info->flags */
255 ATA_EHI_HOTPLUGGED = (1 << 0), /* could have been hotplugged */
256
257 ATA_EHI_DID_RESET = (1 << 16), /* already reset this port */
258
259 /* max repeat if error condition is still set after ->error_handler */
260 ATA_EH_MAX_REPEAT = 5,
261
262 /* how hard are we gonna try to probe/recover devices */
263 ATA_PROBE_MAX_TRIES = 3,
264 ATA_EH_RESET_TRIES = 3,
265 ATA_EH_DEV_TRIES = 3,
266
267 /* Drive spinup time (time from power-on to the first D2H FIS)
268 * in msecs - 8s currently. Failing to get ready in this time
269 * isn't critical. It will result in reset failure for
270 * controllers which can't wait for the first D2H FIS. libata
271 * will retry, so it just has to be long enough to spin up
272 * most devices.
273 */
274 ATA_SPINUP_WAIT = 8000,
275 };
276
277 enum hsm_task_states {
278 HSM_ST_UNKNOWN, /* state unknown */
279 HSM_ST_IDLE, /* no command on going */
280 HSM_ST, /* (waiting the device to) transfer data */
281 HSM_ST_LAST, /* (waiting the device to) complete command */
282 HSM_ST_ERR, /* error */
283 HSM_ST_FIRST, /* (waiting the device to)
284 write CDB or first data block */
285 };
286
287 enum ata_completion_errors {
288 AC_ERR_DEV = (1 << 0), /* device reported error */
289 AC_ERR_HSM = (1 << 1), /* host state machine violation */
290 AC_ERR_TIMEOUT = (1 << 2), /* timeout */
291 AC_ERR_MEDIA = (1 << 3), /* media error */
292 AC_ERR_ATA_BUS = (1 << 4), /* ATA bus error */
293 AC_ERR_HOST_BUS = (1 << 5), /* host bus error */
294 AC_ERR_SYSTEM = (1 << 6), /* system error */
295 AC_ERR_INVALID = (1 << 7), /* invalid argument */
296 AC_ERR_OTHER = (1 << 8), /* unknown */
297 };
298
299 /* forward declarations */
300 struct scsi_device;
301 struct ata_port_operations;
302 struct ata_port;
303 struct ata_queued_cmd;
304
305 /* typedefs */
306 typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
307 typedef int (*ata_prereset_fn_t)(struct ata_port *ap);
308 typedef int (*ata_reset_fn_t)(struct ata_port *ap, unsigned int *classes);
309 typedef void (*ata_postreset_fn_t)(struct ata_port *ap, unsigned int *classes);
310
311 struct ata_ioports {
312 unsigned long cmd_addr;
313 unsigned long data_addr;
314 unsigned long error_addr;
315 unsigned long feature_addr;
316 unsigned long nsect_addr;
317 unsigned long lbal_addr;
318 unsigned long lbam_addr;
319 unsigned long lbah_addr;
320 unsigned long device_addr;
321 unsigned long status_addr;
322 unsigned long command_addr;
323 unsigned long altstatus_addr;
324 unsigned long ctl_addr;
325 unsigned long bmdma_addr;
326 unsigned long scr_addr;
327 };
328
329 struct ata_probe_ent {
330 struct list_head node;
331 struct device *dev;
332 const struct ata_port_operations *port_ops;
333 struct scsi_host_template *sht;
334 struct ata_ioports port[ATA_MAX_PORTS];
335 unsigned int n_ports;
336 unsigned int hard_port_no;
337 unsigned int pio_mask;
338 unsigned int mwdma_mask;
339 unsigned int udma_mask;
340 unsigned int legacy_mode;
341 unsigned long irq;
342 unsigned int irq_flags;
343 unsigned long host_flags;
344 unsigned long host_set_flags;
345 void __iomem *mmio_base;
346 void *private_data;
347 };
348
349 struct ata_host_set {
350 spinlock_t lock;
351 struct device *dev;
352 unsigned long irq;
353 void __iomem *mmio_base;
354 unsigned int n_ports;
355 void *private_data;
356 const struct ata_port_operations *ops;
357 unsigned long flags;
358 int simplex_claimed; /* Keep seperate in case we
359 ever need to do this locked */
360 struct ata_host_set *next; /* for legacy mode */
361 struct ata_port *ports[0];
362 };
363
364 struct ata_queued_cmd {
365 struct ata_port *ap;
366 struct ata_device *dev;
367
368 struct scsi_cmnd *scsicmd;
369 void (*scsidone)(struct scsi_cmnd *);
370
371 struct ata_taskfile tf;
372 u8 cdb[ATAPI_CDB_LEN];
373
374 unsigned long flags; /* ATA_QCFLAG_xxx */
375 unsigned int tag;
376 unsigned int n_elem;
377 unsigned int orig_n_elem;
378
379 int dma_dir;
380
381 unsigned int pad_len;
382
383 unsigned int nsect;
384 unsigned int cursect;
385
386 unsigned int nbytes;
387 unsigned int curbytes;
388
389 unsigned int cursg;
390 unsigned int cursg_ofs;
391
392 struct scatterlist sgent;
393 struct scatterlist pad_sgent;
394 void *buf_virt;
395
396 /* DO NOT iterate over __sg manually, use ata_for_each_sg() */
397 struct scatterlist *__sg;
398
399 unsigned int err_mask;
400 struct ata_taskfile result_tf;
401 ata_qc_cb_t complete_fn;
402
403 void *private_data;
404 };
405
406 struct ata_host_stats {
407 unsigned long unhandled_irq;
408 unsigned long idle_irq;
409 unsigned long rw_reqbuf;
410 };
411
412 struct ata_ering_entry {
413 int is_io;
414 unsigned int err_mask;
415 u64 timestamp;
416 };
417
418 struct ata_ering {
419 int cursor;
420 struct ata_ering_entry ring[ATA_ERING_SIZE];
421 };
422
423 struct ata_device {
424 struct ata_port *ap;
425 unsigned int devno; /* 0 or 1 */
426 unsigned long flags; /* ATA_DFLAG_xxx */
427 struct scsi_device *sdev; /* attached SCSI device */
428 /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
429 u64 n_sectors; /* size of device, if ATA */
430 unsigned int class; /* ATA_DEV_xxx */
431 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
432 u8 pio_mode;
433 u8 dma_mode;
434 u8 xfer_mode;
435 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
436
437 unsigned int multi_count; /* sectors count for
438 READ/WRITE MULTIPLE */
439 unsigned int max_sectors; /* per-device max sectors */
440 unsigned int cdb_len;
441
442 /* per-dev xfer mask */
443 unsigned int pio_mask;
444 unsigned int mwdma_mask;
445 unsigned int udma_mask;
446
447 /* for CHS addressing */
448 u16 cylinders; /* Number of cylinders */
449 u16 heads; /* Number of heads */
450 u16 sectors; /* Number of sectors per track */
451
452 /* error history */
453 struct ata_ering ering;
454 };
455
456 /* Offset into struct ata_device. Fields above it are maintained
457 * acress device init. Fields below are zeroed.
458 */
459 #define ATA_DEVICE_CLEAR_OFFSET offsetof(struct ata_device, n_sectors)
460
461 struct ata_eh_info {
462 struct ata_device *dev; /* offending device */
463 u32 serror; /* SError from LLDD */
464 unsigned int err_mask; /* port-wide err_mask */
465 unsigned int action; /* ATA_EH_* action mask */
466 unsigned int dev_action[ATA_MAX_DEVICES]; /* dev EH action */
467 unsigned int flags; /* ATA_EHI_* flags */
468
469 unsigned long hotplug_timestamp;
470 unsigned int probe_mask;
471
472 char desc[ATA_EH_DESC_LEN];
473 int desc_len;
474 };
475
476 struct ata_eh_context {
477 struct ata_eh_info i;
478 int tries[ATA_MAX_DEVICES];
479 unsigned int classes[ATA_MAX_DEVICES];
480 unsigned int did_probe_mask;
481 };
482
483 struct ata_port {
484 struct Scsi_Host *host; /* our co-allocated scsi host */
485 const struct ata_port_operations *ops;
486 unsigned long flags; /* ATA_FLAG_xxx */
487 unsigned int id; /* unique id req'd by scsi midlyr */
488 unsigned int port_no; /* unique port #; from zero */
489 unsigned int hard_port_no; /* hardware port #; from zero */
490
491 struct ata_prd *prd; /* our SG list */
492 dma_addr_t prd_dma; /* and its DMA mapping */
493
494 void *pad; /* array of DMA pad buffers */
495 dma_addr_t pad_dma;
496
497 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
498
499 u8 ctl; /* cache of ATA control register */
500 u8 last_ctl; /* Cache last written value */
501 unsigned int pio_mask;
502 unsigned int mwdma_mask;
503 unsigned int udma_mask;
504 unsigned int cbl; /* cable type; ATA_CBL_xxx */
505 unsigned int hw_sata_spd_limit;
506 unsigned int sata_spd_limit; /* SATA PHY speed limit */
507
508 /* record runtime error info, protected by host_set lock */
509 struct ata_eh_info eh_info;
510 /* EH context owned by EH */
511 struct ata_eh_context eh_context;
512
513 struct ata_device device[ATA_MAX_DEVICES];
514
515 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
516 unsigned long qc_allocated;
517 unsigned int qc_active;
518
519 unsigned int active_tag;
520 u32 sactive;
521
522 struct ata_host_stats stats;
523 struct ata_host_set *host_set;
524 struct device *dev;
525
526 struct work_struct port_task;
527 struct work_struct hotplug_task;
528 struct work_struct scsi_rescan_task;
529
530 unsigned int hsm_task_state;
531
532 u32 msg_enable;
533 struct list_head eh_done_q;
534 wait_queue_head_t eh_wait_q;
535
536 void *private_data;
537
538 u8 sector_buf[ATA_SECT_SIZE]; /* owned by EH */
539 };
540
541 struct ata_port_operations {
542 void (*port_disable) (struct ata_port *);
543
544 void (*dev_config) (struct ata_port *, struct ata_device *);
545
546 void (*set_piomode) (struct ata_port *, struct ata_device *);
547 void (*set_dmamode) (struct ata_port *, struct ata_device *);
548 unsigned long (*mode_filter) (const struct ata_port *, struct ata_device *, unsigned long);
549
550 void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
551 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
552
553 void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
554 u8 (*check_status)(struct ata_port *ap);
555 u8 (*check_altstatus)(struct ata_port *ap);
556 void (*dev_select)(struct ata_port *ap, unsigned int device);
557
558 void (*phy_reset) (struct ata_port *ap); /* obsolete */
559 void (*set_mode) (struct ata_port *ap);
560
561 void (*post_set_mode) (struct ata_port *ap);
562
563 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
564
565 void (*bmdma_setup) (struct ata_queued_cmd *qc);
566 void (*bmdma_start) (struct ata_queued_cmd *qc);
567
568 void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
569
570 void (*qc_prep) (struct ata_queued_cmd *qc);
571 unsigned int (*qc_issue) (struct ata_queued_cmd *qc);
572
573 /* Error handlers. ->error_handler overrides ->eng_timeout and
574 * indicates that new-style EH is in place.
575 */
576 void (*eng_timeout) (struct ata_port *ap); /* obsolete */
577
578 void (*freeze) (struct ata_port *ap);
579 void (*thaw) (struct ata_port *ap);
580 void (*error_handler) (struct ata_port *ap);
581 void (*post_internal_cmd) (struct ata_queued_cmd *qc);
582
583 irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
584 void (*irq_clear) (struct ata_port *);
585
586 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
587 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
588 u32 val);
589
590 int (*port_start) (struct ata_port *ap);
591 void (*port_stop) (struct ata_port *ap);
592
593 void (*host_stop) (struct ata_host_set *host_set);
594
595 void (*bmdma_stop) (struct ata_queued_cmd *qc);
596 u8 (*bmdma_status) (struct ata_port *ap);
597 };
598
599 struct ata_port_info {
600 struct scsi_host_template *sht;
601 unsigned long host_flags;
602 unsigned long pio_mask;
603 unsigned long mwdma_mask;
604 unsigned long udma_mask;
605 const struct ata_port_operations *port_ops;
606 void *private_data;
607 };
608
609 struct ata_timing {
610 unsigned short mode; /* ATA mode */
611 unsigned short setup; /* t1 */
612 unsigned short act8b; /* t2 for 8-bit I/O */
613 unsigned short rec8b; /* t2i for 8-bit I/O */
614 unsigned short cyc8b; /* t0 for 8-bit I/O */
615 unsigned short active; /* t2 or tD */
616 unsigned short recover; /* t2i or tK */
617 unsigned short cycle; /* t0 */
618 unsigned short udma; /* t2CYCTYP/2 */
619 };
620
621 #define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
622
623 extern const unsigned long sata_deb_timing_boot[];
624 extern const unsigned long sata_deb_timing_eh[];
625 extern const unsigned long sata_deb_timing_before_fsrst[];
626
627 extern void ata_port_probe(struct ata_port *);
628 extern void __sata_phy_reset(struct ata_port *ap);
629 extern void sata_phy_reset(struct ata_port *ap);
630 extern void ata_bus_reset(struct ata_port *ap);
631 extern int sata_set_spd(struct ata_port *ap);
632 extern int sata_phy_debounce(struct ata_port *ap, const unsigned long *param);
633 extern int sata_phy_resume(struct ata_port *ap, const unsigned long *param);
634 extern int ata_std_prereset(struct ata_port *ap);
635 extern int ata_std_softreset(struct ata_port *ap, unsigned int *classes);
636 extern int sata_std_hardreset(struct ata_port *ap, unsigned int *class);
637 extern void ata_std_postreset(struct ata_port *ap, unsigned int *classes);
638 extern int ata_dev_revalidate(struct ata_device *dev, int post_reset);
639 extern void ata_port_disable(struct ata_port *);
640 extern void ata_std_ports(struct ata_ioports *ioaddr);
641 #ifdef CONFIG_PCI
642 extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
643 unsigned int n_ports);
644 extern void ata_pci_remove_one (struct pci_dev *pdev);
645 extern int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state);
646 extern int ata_pci_device_resume(struct pci_dev *pdev);
647 extern int ata_pci_clear_simplex(struct pci_dev *pdev);
648 #endif /* CONFIG_PCI */
649 extern int ata_device_add(const struct ata_probe_ent *ent);
650 extern void ata_port_detach(struct ata_port *ap);
651 extern void ata_host_set_remove(struct ata_host_set *host_set);
652 extern int ata_scsi_detect(struct scsi_host_template *sht);
653 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
654 extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
655 extern int ata_scsi_release(struct Scsi_Host *host);
656 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
657 extern int sata_scr_valid(struct ata_port *ap);
658 extern int sata_scr_read(struct ata_port *ap, int reg, u32 *val);
659 extern int sata_scr_write(struct ata_port *ap, int reg, u32 val);
660 extern int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val);
661 extern int ata_port_online(struct ata_port *ap);
662 extern int ata_port_offline(struct ata_port *ap);
663 extern int ata_scsi_device_resume(struct scsi_device *);
664 extern int ata_scsi_device_suspend(struct scsi_device *, pm_message_t state);
665 extern int ata_device_resume(struct ata_device *);
666 extern int ata_device_suspend(struct ata_device *, pm_message_t state);
667 extern int ata_ratelimit(void);
668 extern unsigned int ata_busy_sleep(struct ata_port *ap,
669 unsigned long timeout_pat,
670 unsigned long timeout);
671 extern void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *),
672 void *data, unsigned long delay);
673 extern u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
674 unsigned long interval_msec,
675 unsigned long timeout_msec);
676
677 /*
678 * Default driver ops implementations
679 */
680 extern void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
681 extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
682 extern void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp);
683 extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
684 extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
685 extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
686 extern u8 ata_check_status(struct ata_port *ap);
687 extern u8 ata_altstatus(struct ata_port *ap);
688 extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf);
689 extern int ata_port_start (struct ata_port *ap);
690 extern void ata_port_stop (struct ata_port *ap);
691 extern void ata_host_stop (struct ata_host_set *host_set);
692 extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
693 extern void ata_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
694 unsigned int buflen, int write_data);
695 extern void ata_pio_data_xfer(struct ata_device *adev, unsigned char *buf,
696 unsigned int buflen, int write_data);
697 extern void ata_pio_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
698 unsigned int buflen, int write_data);
699 extern void ata_qc_prep(struct ata_queued_cmd *qc);
700 extern void ata_noop_qc_prep(struct ata_queued_cmd *qc);
701 extern unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc);
702 extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
703 unsigned int buflen);
704 extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
705 unsigned int n_elem);
706 extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
707 extern void ata_id_string(const u16 *id, unsigned char *s,
708 unsigned int ofs, unsigned int len);
709 extern void ata_id_c_string(const u16 *id, unsigned char *s,
710 unsigned int ofs, unsigned int len);
711 extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
712 extern void ata_bmdma_start (struct ata_queued_cmd *qc);
713 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
714 extern u8 ata_bmdma_status(struct ata_port *ap);
715 extern void ata_bmdma_irq_clear(struct ata_port *ap);
716 extern void ata_bmdma_freeze(struct ata_port *ap);
717 extern void ata_bmdma_thaw(struct ata_port *ap);
718 extern void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
719 ata_reset_fn_t softreset,
720 ata_reset_fn_t hardreset,
721 ata_postreset_fn_t postreset);
722 extern void ata_bmdma_error_handler(struct ata_port *ap);
723 extern void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc);
724 extern int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
725 u8 status, int in_wq);
726 extern void ata_qc_complete(struct ata_queued_cmd *qc);
727 extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
728 void (*finish_qc)(struct ata_queued_cmd *));
729 extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
730 void (*done)(struct scsi_cmnd *));
731 extern int ata_std_bios_param(struct scsi_device *sdev,
732 struct block_device *bdev,
733 sector_t capacity, int geom[]);
734 extern int ata_scsi_slave_config(struct scsi_device *sdev);
735 extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
736 extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
737 int queue_depth);
738 extern struct ata_device *ata_dev_pair(struct ata_device *adev);
739
740 /*
741 * Timing helpers
742 */
743
744 extern unsigned int ata_pio_need_iordy(const struct ata_device *);
745 extern int ata_timing_compute(struct ata_device *, unsigned short,
746 struct ata_timing *, int, int);
747 extern void ata_timing_merge(const struct ata_timing *,
748 const struct ata_timing *, struct ata_timing *,
749 unsigned int);
750
751 enum {
752 ATA_TIMING_SETUP = (1 << 0),
753 ATA_TIMING_ACT8B = (1 << 1),
754 ATA_TIMING_REC8B = (1 << 2),
755 ATA_TIMING_CYC8B = (1 << 3),
756 ATA_TIMING_8BIT = ATA_TIMING_ACT8B | ATA_TIMING_REC8B |
757 ATA_TIMING_CYC8B,
758 ATA_TIMING_ACTIVE = (1 << 4),
759 ATA_TIMING_RECOVER = (1 << 5),
760 ATA_TIMING_CYCLE = (1 << 6),
761 ATA_TIMING_UDMA = (1 << 7),
762 ATA_TIMING_ALL = ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
763 ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
764 ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
765 ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
766 };
767
768
769 #ifdef CONFIG_PCI
770 struct pci_bits {
771 unsigned int reg; /* PCI config register to read */
772 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
773 unsigned long mask;
774 unsigned long val;
775 };
776
777 extern void ata_pci_host_stop (struct ata_host_set *host_set);
778 extern struct ata_probe_ent *
779 ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int portmask);
780 extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);
781 extern unsigned long ata_pci_default_filter(const struct ata_port *, struct ata_device *, unsigned long);
782 #endif /* CONFIG_PCI */
783
784 /*
785 * EH
786 */
787 extern void ata_eng_timeout(struct ata_port *ap);
788
789 extern void ata_port_schedule_eh(struct ata_port *ap);
790 extern int ata_port_abort(struct ata_port *ap);
791 extern int ata_port_freeze(struct ata_port *ap);
792
793 extern void ata_eh_freeze_port(struct ata_port *ap);
794 extern void ata_eh_thaw_port(struct ata_port *ap);
795
796 extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
797 extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
798
799 extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
800 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
801 ata_postreset_fn_t postreset);
802
803 /*
804 * printk helpers
805 */
806 #define ata_port_printk(ap, lv, fmt, args...) \
807 printk(lv"ata%u: "fmt, (ap)->id , ##args)
808
809 #define ata_dev_printk(dev, lv, fmt, args...) \
810 printk(lv"ata%u.%02u: "fmt, (dev)->ap->id, (dev)->devno , ##args)
811
812 /*
813 * ata_eh_info helpers
814 */
815 #define ata_ehi_push_desc(ehi, fmt, args...) do { \
816 (ehi)->desc_len += scnprintf((ehi)->desc + (ehi)->desc_len, \
817 ATA_EH_DESC_LEN - (ehi)->desc_len, \
818 fmt , ##args); \
819 } while (0)
820
821 #define ata_ehi_clear_desc(ehi) do { \
822 (ehi)->desc[0] = '\0'; \
823 (ehi)->desc_len = 0; \
824 } while (0)
825
826 static inline void ata_ehi_hotplugged(struct ata_eh_info *ehi)
827 {
828 if (ehi->flags & ATA_EHI_HOTPLUGGED)
829 return;
830
831 ehi->flags |= ATA_EHI_HOTPLUGGED;
832 ehi->hotplug_timestamp = jiffies;
833
834 ehi->err_mask |= AC_ERR_ATA_BUS;
835 ehi->action |= ATA_EH_SOFTRESET;
836 ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
837 }
838
839 /*
840 * qc helpers
841 */
842 static inline int
843 ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
844 {
845 if (sg == &qc->pad_sgent)
846 return 1;
847 if (qc->pad_len)
848 return 0;
849 if (((sg - qc->__sg) + 1) == qc->n_elem)
850 return 1;
851 return 0;
852 }
853
854 static inline struct scatterlist *
855 ata_qc_first_sg(struct ata_queued_cmd *qc)
856 {
857 if (qc->n_elem)
858 return qc->__sg;
859 if (qc->pad_len)
860 return &qc->pad_sgent;
861 return NULL;
862 }
863
864 static inline struct scatterlist *
865 ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
866 {
867 if (sg == &qc->pad_sgent)
868 return NULL;
869 if (++sg - qc->__sg < qc->n_elem)
870 return sg;
871 if (qc->pad_len)
872 return &qc->pad_sgent;
873 return NULL;
874 }
875
876 #define ata_for_each_sg(sg, qc) \
877 for (sg = ata_qc_first_sg(qc); sg; sg = ata_qc_next_sg(sg, qc))
878
879 static inline unsigned int ata_tag_valid(unsigned int tag)
880 {
881 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
882 }
883
884 static inline unsigned int ata_tag_internal(unsigned int tag)
885 {
886 return tag == ATA_MAX_QUEUE - 1;
887 }
888
889 static inline unsigned int ata_class_enabled(unsigned int class)
890 {
891 return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI;
892 }
893
894 static inline unsigned int ata_class_disabled(unsigned int class)
895 {
896 return class == ATA_DEV_ATA_UNSUP || class == ATA_DEV_ATAPI_UNSUP;
897 }
898
899 static inline unsigned int ata_class_absent(unsigned int class)
900 {
901 return !ata_class_enabled(class) && !ata_class_disabled(class);
902 }
903
904 static inline unsigned int ata_dev_enabled(const struct ata_device *dev)
905 {
906 return ata_class_enabled(dev->class);
907 }
908
909 static inline unsigned int ata_dev_disabled(const struct ata_device *dev)
910 {
911 return ata_class_disabled(dev->class);
912 }
913
914 static inline unsigned int ata_dev_absent(const struct ata_device *dev)
915 {
916 return ata_class_absent(dev->class);
917 }
918
919 static inline u8 ata_chk_status(struct ata_port *ap)
920 {
921 return ap->ops->check_status(ap);
922 }
923
924
925 /**
926 * ata_pause - Flush writes and pause 400 nanoseconds.
927 * @ap: Port to wait for.
928 *
929 * LOCKING:
930 * Inherited from caller.
931 */
932
933 static inline void ata_pause(struct ata_port *ap)
934 {
935 ata_altstatus(ap);
936 ndelay(400);
937 }
938
939
940 /**
941 * ata_busy_wait - Wait for a port status register
942 * @ap: Port to wait for.
943 *
944 * Waits up to max*10 microseconds for the selected bits in the port's
945 * status register to be cleared.
946 * Returns final value of status register.
947 *
948 * LOCKING:
949 * Inherited from caller.
950 */
951
952 static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
953 unsigned int max)
954 {
955 u8 status;
956
957 do {
958 udelay(10);
959 status = ata_chk_status(ap);
960 max--;
961 } while ((status & bits) && (max > 0));
962
963 return status;
964 }
965
966
967 /**
968 * ata_wait_idle - Wait for a port to be idle.
969 * @ap: Port to wait for.
970 *
971 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
972 * Returns final value of status register.
973 *
974 * LOCKING:
975 * Inherited from caller.
976 */
977
978 static inline u8 ata_wait_idle(struct ata_port *ap)
979 {
980 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
981
982 if (status & (ATA_BUSY | ATA_DRQ)) {
983 unsigned long l = ap->ioaddr.status_addr;
984 if (ata_msg_warn(ap))
985 printk(KERN_WARNING "ATA: abnormal status 0x%X on port 0x%lX\n",
986 status, l);
987 }
988
989 return status;
990 }
991
992 static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
993 {
994 qc->tf.ctl |= ATA_NIEN;
995 }
996
997 static inline struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
998 unsigned int tag)
999 {
1000 if (likely(ata_tag_valid(tag)))
1001 return &ap->qcmd[tag];
1002 return NULL;
1003 }
1004
1005 static inline struct ata_queued_cmd *ata_qc_from_tag(struct ata_port *ap,
1006 unsigned int tag)
1007 {
1008 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
1009
1010 if (unlikely(!qc) || !ap->ops->error_handler)
1011 return qc;
1012
1013 if ((qc->flags & (ATA_QCFLAG_ACTIVE |
1014 ATA_QCFLAG_FAILED)) == ATA_QCFLAG_ACTIVE)
1015 return qc;
1016
1017 return NULL;
1018 }
1019
1020 static inline void ata_tf_init(struct ata_device *dev, struct ata_taskfile *tf)
1021 {
1022 memset(tf, 0, sizeof(*tf));
1023
1024 tf->ctl = dev->ap->ctl;
1025 if (dev->devno == 0)
1026 tf->device = ATA_DEVICE_OBS;
1027 else
1028 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
1029 }
1030
1031 static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
1032 {
1033 qc->__sg = NULL;
1034 qc->flags = 0;
1035 qc->cursect = qc->cursg = qc->cursg_ofs = 0;
1036 qc->nsect = 0;
1037 qc->nbytes = qc->curbytes = 0;
1038 qc->err_mask = 0;
1039
1040 ata_tf_init(qc->dev, &qc->tf);
1041
1042 /* init result_tf such that it indicates normal completion */
1043 qc->result_tf.command = ATA_DRDY;
1044 qc->result_tf.feature = 0;
1045 }
1046
1047 /**
1048 * ata_irq_on - Enable interrupts on a port.
1049 * @ap: Port on which interrupts are enabled.
1050 *
1051 * Enable interrupts on a legacy IDE device using MMIO or PIO,
1052 * wait for idle, clear any pending interrupts.
1053 *
1054 * LOCKING:
1055 * Inherited from caller.
1056 */
1057
1058 static inline u8 ata_irq_on(struct ata_port *ap)
1059 {
1060 struct ata_ioports *ioaddr = &ap->ioaddr;
1061 u8 tmp;
1062
1063 ap->ctl &= ~ATA_NIEN;
1064 ap->last_ctl = ap->ctl;
1065
1066 if (ap->flags & ATA_FLAG_MMIO)
1067 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1068 else
1069 outb(ap->ctl, ioaddr->ctl_addr);
1070 tmp = ata_wait_idle(ap);
1071
1072 ap->ops->irq_clear(ap);
1073
1074 return tmp;
1075 }
1076
1077
1078 /**
1079 * ata_irq_ack - Acknowledge a device interrupt.
1080 * @ap: Port on which interrupts are enabled.
1081 *
1082 * Wait up to 10 ms for legacy IDE device to become idle (BUSY
1083 * or BUSY+DRQ clear). Obtain dma status and port status from
1084 * device. Clear the interrupt. Return port status.
1085 *
1086 * LOCKING:
1087 */
1088
1089 static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
1090 {
1091 unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
1092 u8 host_stat, post_stat, status;
1093
1094 status = ata_busy_wait(ap, bits, 1000);
1095 if (status & bits)
1096 if (ata_msg_err(ap))
1097 printk(KERN_ERR "abnormal status 0x%X\n", status);
1098
1099 /* get controller status; clear intr, err bits */
1100 if (ap->flags & ATA_FLAG_MMIO) {
1101 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
1102 host_stat = readb(mmio + ATA_DMA_STATUS);
1103 writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
1104 mmio + ATA_DMA_STATUS);
1105
1106 post_stat = readb(mmio + ATA_DMA_STATUS);
1107 } else {
1108 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
1109 outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
1110 ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
1111
1112 post_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
1113 }
1114
1115 if (ata_msg_intr(ap))
1116 printk(KERN_INFO "%s: irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
1117 __FUNCTION__,
1118 host_stat, post_stat, status);
1119
1120 return status;
1121 }
1122
1123 static inline int ata_try_flush_cache(const struct ata_device *dev)
1124 {
1125 return ata_id_wcache_enabled(dev->id) ||
1126 ata_id_has_flush(dev->id) ||
1127 ata_id_has_flush_ext(dev->id);
1128 }
1129
1130 static inline unsigned int ac_err_mask(u8 status)
1131 {
1132 if (status & (ATA_BUSY | ATA_DRQ))
1133 return AC_ERR_HSM;
1134 if (status & (ATA_ERR | ATA_DF))
1135 return AC_ERR_DEV;
1136 return 0;
1137 }
1138
1139 static inline unsigned int __ac_err_mask(u8 status)
1140 {
1141 unsigned int mask = ac_err_mask(status);
1142 if (mask == 0)
1143 return AC_ERR_OTHER;
1144 return mask;
1145 }
1146
1147 static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev)
1148 {
1149 ap->pad_dma = 0;
1150 ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ,
1151 &ap->pad_dma, GFP_KERNEL);
1152 return (ap->pad == NULL) ? -ENOMEM : 0;
1153 }
1154
1155 static inline void ata_pad_free(struct ata_port *ap, struct device *dev)
1156 {
1157 dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
1158 }
1159
1160 static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
1161 {
1162 return (struct ata_port *) &host->hostdata[0];
1163 }
1164
1165 #endif /* __LINUX_LIBATA_H__ */
Linux kernel - Deliverables
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