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1 /*
2 * Copyright 2003-2005 Red Hat, Inc. All rights reserved.
3 * Copyright 2003-2005 Jeff Garzik
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2, or (at your option)
9 * any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; see the file COPYING. If not, write to
18 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
19 *
20 *
21 * libata documentation is available via 'make {ps|pdf}docs',
22 * as Documentation/DocBook/libata.*
23 *
24 */
25
26 #ifndef __LINUX_LIBATA_H__
27 #define __LINUX_LIBATA_H__
28
29 #include <linux/delay.h>
30 #include <linux/interrupt.h>
31 #include <linux/pci.h>
32 #include <linux/dma-mapping.h>
33 #include <asm/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
253 /* ata_eh_info->flags */
254 ATA_EHI_HOTPLUGGED = (1 << 0), /* could have been hotplugged */
255
256 ATA_EHI_DID_RESET = (1 << 16), /* already reset this port */
257
258 /* max repeat if error condition is still set after ->error_handler */
259 ATA_EH_MAX_REPEAT = 5,
260
261 /* how hard are we gonna try to probe/recover devices */
262 ATA_PROBE_MAX_TRIES = 3,
263 ATA_EH_RESET_TRIES = 3,
264 ATA_EH_DEV_TRIES = 3,
265
266 /* Drive spinup time (time from power-on to the first D2H FIS)
267 * in msecs - 8s currently. Failing to get ready in this time
268 * isn't critical. It will result in reset failure for
269 * controllers which can't wait for the first D2H FIS. libata
270 * will retry, so it just has to be long enough to spin up
271 * most devices.
272 */
273 ATA_SPINUP_WAIT = 8000,
274 };
275
276 enum hsm_task_states {
277 HSM_ST_UNKNOWN, /* state unknown */
278 HSM_ST_IDLE, /* no command on going */
279 HSM_ST, /* (waiting the device to) transfer data */
280 HSM_ST_LAST, /* (waiting the device to) complete command */
281 HSM_ST_ERR, /* error */
282 HSM_ST_FIRST, /* (waiting the device to)
283 write CDB or first data block */
284 };
285
286 enum ata_completion_errors {
287 AC_ERR_DEV = (1 << 0), /* device reported error */
288 AC_ERR_HSM = (1 << 1), /* host state machine violation */
289 AC_ERR_TIMEOUT = (1 << 2), /* timeout */
290 AC_ERR_MEDIA = (1 << 3), /* media error */
291 AC_ERR_ATA_BUS = (1 << 4), /* ATA bus error */
292 AC_ERR_HOST_BUS = (1 << 5), /* host bus error */
293 AC_ERR_SYSTEM = (1 << 6), /* system error */
294 AC_ERR_INVALID = (1 << 7), /* invalid argument */
295 AC_ERR_OTHER = (1 << 8), /* unknown */
296 };
297
298 /* forward declarations */
299 struct scsi_device;
300 struct ata_port_operations;
301 struct ata_port;
302 struct ata_queued_cmd;
303
304 /* typedefs */
305 typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
306 typedef void (*ata_probeinit_fn_t)(struct ata_port *ap);
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_port * ports[0];
361 };
362
363 struct ata_queued_cmd {
364 struct ata_port *ap;
365 struct ata_device *dev;
366
367 struct scsi_cmnd *scsicmd;
368 void (*scsidone)(struct scsi_cmnd *);
369
370 struct ata_taskfile tf;
371 u8 cdb[ATAPI_CDB_LEN];
372
373 unsigned long flags; /* ATA_QCFLAG_xxx */
374 unsigned int tag;
375 unsigned int n_elem;
376 unsigned int orig_n_elem;
377
378 int dma_dir;
379
380 unsigned int pad_len;
381
382 unsigned int nsect;
383 unsigned int cursect;
384
385 unsigned int nbytes;
386 unsigned int curbytes;
387
388 unsigned int cursg;
389 unsigned int cursg_ofs;
390
391 struct scatterlist sgent;
392 struct scatterlist pad_sgent;
393 void *buf_virt;
394
395 /* DO NOT iterate over __sg manually, use ata_for_each_sg() */
396 struct scatterlist *__sg;
397
398 unsigned int err_mask;
399 struct ata_taskfile result_tf;
400 ata_qc_cb_t complete_fn;
401
402 void *private_data;
403 };
404
405 struct ata_host_stats {
406 unsigned long unhandled_irq;
407 unsigned long idle_irq;
408 unsigned long rw_reqbuf;
409 };
410
411 struct ata_ering_entry {
412 int is_io;
413 unsigned int err_mask;
414 u64 timestamp;
415 };
416
417 struct ata_ering {
418 int cursor;
419 struct ata_ering_entry ring[ATA_ERING_SIZE];
420 };
421
422 struct ata_device {
423 struct ata_port *ap;
424 unsigned int devno; /* 0 or 1 */
425 unsigned long flags; /* ATA_DFLAG_xxx */
426 struct scsi_device *sdev; /* attached SCSI device */
427 /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
428 u64 n_sectors; /* size of device, if ATA */
429 unsigned int class; /* ATA_DEV_xxx */
430 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
431 u8 pio_mode;
432 u8 dma_mode;
433 u8 xfer_mode;
434 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
435
436 unsigned int multi_count; /* sectors count for
437 READ/WRITE MULTIPLE */
438 unsigned int max_sectors; /* per-device max sectors */
439 unsigned int cdb_len;
440
441 /* per-dev xfer mask */
442 unsigned int pio_mask;
443 unsigned int mwdma_mask;
444 unsigned int udma_mask;
445
446 /* for CHS addressing */
447 u16 cylinders; /* Number of cylinders */
448 u16 heads; /* Number of heads */
449 u16 sectors; /* Number of sectors per track */
450
451 /* error history */
452 struct ata_ering ering;
453 };
454
455 /* Offset into struct ata_device. Fields above it are maintained
456 * acress device init. Fields below are zeroed.
457 */
458 #define ATA_DEVICE_CLEAR_OFFSET offsetof(struct ata_device, n_sectors)
459
460 struct ata_eh_info {
461 struct ata_device *dev; /* offending device */
462 u32 serror; /* SError from LLDD */
463 unsigned int err_mask; /* port-wide err_mask */
464 unsigned int action; /* ATA_EH_* action mask */
465 unsigned int flags; /* ATA_EHI_* flags */
466
467 unsigned long hotplug_timestamp;
468 unsigned int probe_mask;
469
470 char desc[ATA_EH_DESC_LEN];
471 int desc_len;
472 };
473
474 struct ata_eh_context {
475 struct ata_eh_info i;
476 int tries[ATA_MAX_DEVICES];
477 unsigned int classes[ATA_MAX_DEVICES];
478 unsigned int did_probe_mask;
479 };
480
481 struct ata_port {
482 struct Scsi_Host *host; /* our co-allocated scsi host */
483 const struct ata_port_operations *ops;
484 unsigned long flags; /* ATA_FLAG_xxx */
485 unsigned int id; /* unique id req'd by scsi midlyr */
486 unsigned int port_no; /* unique port #; from zero */
487 unsigned int hard_port_no; /* hardware port #; from zero */
488
489 struct ata_prd *prd; /* our SG list */
490 dma_addr_t prd_dma; /* and its DMA mapping */
491
492 void *pad; /* array of DMA pad buffers */
493 dma_addr_t pad_dma;
494
495 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
496
497 u8 ctl; /* cache of ATA control register */
498 u8 last_ctl; /* Cache last written value */
499 unsigned int pio_mask;
500 unsigned int mwdma_mask;
501 unsigned int udma_mask;
502 unsigned int cbl; /* cable type; ATA_CBL_xxx */
503 unsigned int hw_sata_spd_limit;
504 unsigned int sata_spd_limit; /* SATA PHY speed limit */
505
506 /* record runtime error info, protected by host_set lock */
507 struct ata_eh_info eh_info;
508 /* EH context owned by EH */
509 struct ata_eh_context eh_context;
510
511 struct ata_device device[ATA_MAX_DEVICES];
512
513 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
514 unsigned long qc_allocated;
515 unsigned int qc_active;
516
517 unsigned int active_tag;
518 u32 sactive;
519
520 struct ata_host_stats stats;
521 struct ata_host_set *host_set;
522 struct device *dev;
523
524 struct work_struct port_task;
525
526 unsigned int hsm_task_state;
527
528 u32 msg_enable;
529 struct list_head eh_done_q;
530 wait_queue_head_t eh_wait_q;
531
532 void *private_data;
533
534 u8 sector_buf[ATA_SECT_SIZE]; /* owned by EH */
535 };
536
537 struct ata_port_operations {
538 void (*port_disable) (struct ata_port *);
539
540 void (*dev_config) (struct ata_port *, struct ata_device *);
541
542 void (*set_piomode) (struct ata_port *, struct ata_device *);
543 void (*set_dmamode) (struct ata_port *, struct ata_device *);
544 unsigned long (*mode_filter) (const struct ata_port *, struct ata_device *, unsigned long);
545
546 void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
547 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
548
549 void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
550 u8 (*check_status)(struct ata_port *ap);
551 u8 (*check_altstatus)(struct ata_port *ap);
552 void (*dev_select)(struct ata_port *ap, unsigned int device);
553
554 void (*phy_reset) (struct ata_port *ap); /* obsolete */
555 void (*set_mode) (struct ata_port *ap);
556 int (*probe_reset) (struct ata_port *ap, unsigned int *classes);
557
558 void (*post_set_mode) (struct ata_port *ap);
559
560 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
561
562 void (*bmdma_setup) (struct ata_queued_cmd *qc);
563 void (*bmdma_start) (struct ata_queued_cmd *qc);
564
565 void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
566
567 void (*qc_prep) (struct ata_queued_cmd *qc);
568 unsigned int (*qc_issue) (struct ata_queued_cmd *qc);
569
570 /* Error handlers. ->error_handler overrides ->eng_timeout and
571 * indicates that new-style EH is in place.
572 */
573 void (*eng_timeout) (struct ata_port *ap); /* obsolete */
574
575 void (*freeze) (struct ata_port *ap);
576 void (*thaw) (struct ata_port *ap);
577 void (*error_handler) (struct ata_port *ap);
578 void (*post_internal_cmd) (struct ata_queued_cmd *qc);
579
580 irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
581 void (*irq_clear) (struct ata_port *);
582
583 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
584 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
585 u32 val);
586
587 int (*port_start) (struct ata_port *ap);
588 void (*port_stop) (struct ata_port *ap);
589
590 void (*host_stop) (struct ata_host_set *host_set);
591
592 void (*bmdma_stop) (struct ata_queued_cmd *qc);
593 u8 (*bmdma_status) (struct ata_port *ap);
594 };
595
596 struct ata_port_info {
597 struct scsi_host_template *sht;
598 unsigned long host_flags;
599 unsigned long pio_mask;
600 unsigned long mwdma_mask;
601 unsigned long udma_mask;
602 const struct ata_port_operations *port_ops;
603 void *private_data;
604 };
605
606 struct ata_timing {
607 unsigned short mode; /* ATA mode */
608 unsigned short setup; /* t1 */
609 unsigned short act8b; /* t2 for 8-bit I/O */
610 unsigned short rec8b; /* t2i for 8-bit I/O */
611 unsigned short cyc8b; /* t0 for 8-bit I/O */
612 unsigned short active; /* t2 or tD */
613 unsigned short recover; /* t2i or tK */
614 unsigned short cycle; /* t0 */
615 unsigned short udma; /* t2CYCTYP/2 */
616 };
617
618 #define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
619
620 extern const unsigned long sata_deb_timing_boot[];
621 extern const unsigned long sata_deb_timing_eh[];
622 extern const unsigned long sata_deb_timing_before_fsrst[];
623
624 extern void ata_port_probe(struct ata_port *);
625 extern void __sata_phy_reset(struct ata_port *ap);
626 extern void sata_phy_reset(struct ata_port *ap);
627 extern void ata_bus_reset(struct ata_port *ap);
628 extern int sata_set_spd(struct ata_port *ap);
629 extern int sata_phy_debounce(struct ata_port *ap, const unsigned long *param);
630 extern int sata_phy_resume(struct ata_port *ap, const unsigned long *param);
631 extern int ata_drive_probe_reset(struct ata_port *ap,
632 ata_probeinit_fn_t probeinit,
633 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
634 ata_postreset_fn_t postreset, unsigned int *classes);
635 extern void ata_std_probeinit(struct ata_port *ap);
636 extern int ata_std_prereset(struct ata_port *ap);
637 extern int ata_std_softreset(struct ata_port *ap, unsigned int *classes);
638 extern int sata_std_hardreset(struct ata_port *ap, unsigned int *class);
639 extern void ata_std_postreset(struct ata_port *ap, unsigned int *classes);
640 extern int ata_dev_revalidate(struct ata_device *dev, int post_reset);
641 extern void ata_port_disable(struct ata_port *);
642 extern void ata_std_ports(struct ata_ioports *ioaddr);
643 #ifdef CONFIG_PCI
644 extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
645 unsigned int n_ports);
646 extern void ata_pci_remove_one (struct pci_dev *pdev);
647 extern int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state);
648 extern int ata_pci_device_resume(struct pci_dev *pdev);
649 extern int ata_pci_clear_simplex(struct pci_dev *pdev);
650 #endif /* CONFIG_PCI */
651 extern int ata_device_add(const struct ata_probe_ent *ent);
652 extern void ata_host_set_remove(struct ata_host_set *host_set);
653 extern int ata_scsi_detect(struct scsi_host_template *sht);
654 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
655 extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
656 extern int ata_scsi_release(struct Scsi_Host *host);
657 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
658 extern int sata_scr_valid(struct ata_port *ap);
659 extern int sata_scr_read(struct ata_port *ap, int reg, u32 *val);
660 extern int sata_scr_write(struct ata_port *ap, int reg, u32 val);
661 extern int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val);
662 extern int ata_port_online(struct ata_port *ap);
663 extern int ata_port_offline(struct ata_port *ap);
664 extern int ata_scsi_device_resume(struct scsi_device *);
665 extern int ata_scsi_device_suspend(struct scsi_device *, pm_message_t state);
666 extern int ata_device_resume(struct ata_device *);
667 extern int ata_device_suspend(struct ata_device *, pm_message_t state);
668 extern int ata_ratelimit(void);
669 extern unsigned int ata_busy_sleep(struct ata_port *ap,
670 unsigned long timeout_pat,
671 unsigned long timeout);
672 extern void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *),
673 void *data, unsigned long delay);
674 extern u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
675 unsigned long interval_msec,
676 unsigned long timeout_msec);
677
678 /*
679 * Default driver ops implementations
680 */
681 extern void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
682 extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
683 extern void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp);
684 extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
685 extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
686 extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
687 extern u8 ata_check_status(struct ata_port *ap);
688 extern u8 ata_altstatus(struct ata_port *ap);
689 extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf);
690 extern int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes);
691 extern int ata_port_start (struct ata_port *ap);
692 extern void ata_port_stop (struct ata_port *ap);
693 extern void ata_host_stop (struct ata_host_set *host_set);
694 extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
695 extern void ata_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
696 unsigned int buflen, int write_data);
697 extern void ata_pio_data_xfer(struct ata_device *adev, unsigned char *buf,
698 unsigned int buflen, int write_data);
699 extern void ata_pio_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
700 unsigned int buflen, int write_data);
701 extern void ata_qc_prep(struct ata_queued_cmd *qc);
702 extern void ata_noop_qc_prep(struct ata_queued_cmd *qc);
703 extern unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc);
704 extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
705 unsigned int buflen);
706 extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
707 unsigned int n_elem);
708 extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
709 extern void ata_id_string(const u16 *id, unsigned char *s,
710 unsigned int ofs, unsigned int len);
711 extern void ata_id_c_string(const u16 *id, unsigned char *s,
712 unsigned int ofs, unsigned int len);
713 extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
714 extern void ata_bmdma_start (struct ata_queued_cmd *qc);
715 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
716 extern u8 ata_bmdma_status(struct ata_port *ap);
717 extern void ata_bmdma_irq_clear(struct ata_port *ap);
718 extern void ata_bmdma_freeze(struct ata_port *ap);
719 extern void ata_bmdma_thaw(struct ata_port *ap);
720 extern void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
721 ata_reset_fn_t softreset,
722 ata_reset_fn_t hardreset,
723 ata_postreset_fn_t postreset);
724 extern void ata_bmdma_error_handler(struct ata_port *ap);
725 extern void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc);
726 extern int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
727 u8 status, int in_wq);
728 extern void ata_qc_complete(struct ata_queued_cmd *qc);
729 extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
730 void (*finish_qc)(struct ata_queued_cmd *));
731 extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
732 void (*done)(struct scsi_cmnd *));
733 extern int ata_std_bios_param(struct scsi_device *sdev,
734 struct block_device *bdev,
735 sector_t capacity, int geom[]);
736 extern int ata_scsi_slave_config(struct scsi_device *sdev);
737 extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
738 int queue_depth);
739 extern struct ata_device *ata_dev_pair(struct ata_device *adev);
740
741 /*
742 * Timing helpers
743 */
744
745 extern unsigned int ata_pio_need_iordy(const struct ata_device *);
746 extern int ata_timing_compute(struct ata_device *, unsigned short,
747 struct ata_timing *, int, int);
748 extern void ata_timing_merge(const struct ata_timing *,
749 const struct ata_timing *, struct ata_timing *,
750 unsigned int);
751
752 enum {
753 ATA_TIMING_SETUP = (1 << 0),
754 ATA_TIMING_ACT8B = (1 << 1),
755 ATA_TIMING_REC8B = (1 << 2),
756 ATA_TIMING_CYC8B = (1 << 3),
757 ATA_TIMING_8BIT = ATA_TIMING_ACT8B | ATA_TIMING_REC8B |
758 ATA_TIMING_CYC8B,
759 ATA_TIMING_ACTIVE = (1 << 4),
760 ATA_TIMING_RECOVER = (1 << 5),
761 ATA_TIMING_CYCLE = (1 << 6),
762 ATA_TIMING_UDMA = (1 << 7),
763 ATA_TIMING_ALL = ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
764 ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
765 ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
766 ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
767 };
768
769
770 #ifdef CONFIG_PCI
771 struct pci_bits {
772 unsigned int reg; /* PCI config register to read */
773 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
774 unsigned long mask;
775 unsigned long val;
776 };
777
778 extern void ata_pci_host_stop (struct ata_host_set *host_set);
779 extern struct ata_probe_ent *
780 ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int portmask);
781 extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);
782 extern unsigned long ata_pci_default_filter(const struct ata_port *, struct ata_device *, unsigned long);
783 #endif /* CONFIG_PCI */
784
785 /*
786 * EH
787 */
788 extern void ata_eng_timeout(struct ata_port *ap);
789
790 extern void ata_port_schedule_eh(struct ata_port *ap);
791 extern int ata_port_abort(struct ata_port *ap);
792 extern int ata_port_freeze(struct ata_port *ap);
793
794 extern void ata_eh_freeze_port(struct ata_port *ap);
795 extern void ata_eh_thaw_port(struct ata_port *ap);
796
797 extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
798 extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
799
800 extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
801 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
802 ata_postreset_fn_t postreset);
803
804 /*
805 * printk helpers
806 */
807 #define ata_port_printk(ap, lv, fmt, args...) \
808 printk(lv"ata%u: "fmt, (ap)->id , ##args)
809
810 #define ata_dev_printk(dev, lv, fmt, args...) \
811 printk(lv"ata%u.%02u: "fmt, (dev)->ap->id, (dev)->devno , ##args)
812
813 /*
814 * ata_eh_info helpers
815 */
816 #define ata_ehi_push_desc(ehi, fmt, args...) do { \
817 (ehi)->desc_len += scnprintf((ehi)->desc + (ehi)->desc_len, \
818 ATA_EH_DESC_LEN - (ehi)->desc_len, \
819 fmt , ##args); \
820 } while (0)
821
822 #define ata_ehi_clear_desc(ehi) do { \
823 (ehi)->desc[0] = '\0'; \
824 (ehi)->desc_len = 0; \
825 } while (0)
826
827 static inline void ata_ehi_hotplugged(struct ata_eh_info *ehi)
828 {
829 if (ehi->flags & ATA_EHI_HOTPLUGGED)
830 return;
831
832 ehi->flags |= ATA_EHI_HOTPLUGGED;
833 ehi->hotplug_timestamp = jiffies;
834
835 ehi->err_mask |= AC_ERR_ATA_BUS;
836 ehi->action |= ATA_EH_SOFTRESET;
837 ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
838 }
839
840 /*
841 * qc helpers
842 */
843 static inline int
844 ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
845 {
846 if (sg == &qc->pad_sgent)
847 return 1;
848 if (qc->pad_len)
849 return 0;
850 if (((sg - qc->__sg) + 1) == qc->n_elem)
851 return 1;
852 return 0;
853 }
854
855 static inline struct scatterlist *
856 ata_qc_first_sg(struct ata_queued_cmd *qc)
857 {
858 if (qc->n_elem)
859 return qc->__sg;
860 if (qc->pad_len)
861 return &qc->pad_sgent;
862 return NULL;
863 }
864
865 static inline struct scatterlist *
866 ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
867 {
868 if (sg == &qc->pad_sgent)
869 return NULL;
870 if (++sg - qc->__sg < qc->n_elem)
871 return sg;
872 if (qc->pad_len)
873 return &qc->pad_sgent;
874 return NULL;
875 }
876
877 #define ata_for_each_sg(sg, qc) \
878 for (sg = ata_qc_first_sg(qc); sg; sg = ata_qc_next_sg(sg, qc))
879
880 static inline unsigned int ata_tag_valid(unsigned int tag)
881 {
882 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
883 }
884
885 static inline unsigned int ata_tag_internal(unsigned int tag)
886 {
887 return tag == ATA_MAX_QUEUE - 1;
888 }
889
890 static inline unsigned int ata_class_enabled(unsigned int class)
891 {
892 return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI;
893 }
894
895 static inline unsigned int ata_class_disabled(unsigned int class)
896 {
897 return class == ATA_DEV_ATA_UNSUP || class == ATA_DEV_ATAPI_UNSUP;
898 }
899
900 static inline unsigned int ata_class_absent(unsigned int class)
901 {
902 return !ata_class_enabled(class) && !ata_class_disabled(class);
903 }
904
905 static inline unsigned int ata_dev_enabled(const struct ata_device *dev)
906 {
907 return ata_class_enabled(dev->class);
908 }
909
910 static inline unsigned int ata_dev_disabled(const struct ata_device *dev)
911 {
912 return ata_class_disabled(dev->class);
913 }
914
915 static inline unsigned int ata_dev_absent(const struct ata_device *dev)
916 {
917 return ata_class_absent(dev->class);
918 }
919
920 static inline u8 ata_chk_status(struct ata_port *ap)
921 {
922 return ap->ops->check_status(ap);
923 }
924
925
926 /**
927 * ata_pause - Flush writes and pause 400 nanoseconds.
928 * @ap: Port to wait for.
929 *
930 * LOCKING:
931 * Inherited from caller.
932 */
933
934 static inline void ata_pause(struct ata_port *ap)
935 {
936 ata_altstatus(ap);
937 ndelay(400);
938 }
939
940
941 /**
942 * ata_busy_wait - Wait for a port status register
943 * @ap: Port to wait for.
944 *
945 * Waits up to max*10 microseconds for the selected bits in the port's
946 * status register to be cleared.
947 * Returns final value of status register.
948 *
949 * LOCKING:
950 * Inherited from caller.
951 */
952
953 static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
954 unsigned int max)
955 {
956 u8 status;
957
958 do {
959 udelay(10);
960 status = ata_chk_status(ap);
961 max--;
962 } while ((status & bits) && (max > 0));
963
964 return status;
965 }
966
967
968 /**
969 * ata_wait_idle - Wait for a port to be idle.
970 * @ap: Port to wait for.
971 *
972 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
973 * Returns final value of status register.
974 *
975 * LOCKING:
976 * Inherited from caller.
977 */
978
979 static inline u8 ata_wait_idle(struct ata_port *ap)
980 {
981 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
982
983 if (status & (ATA_BUSY | ATA_DRQ)) {
984 unsigned long l = ap->ioaddr.status_addr;
985 if (ata_msg_warn(ap))
986 printk(KERN_WARNING "ATA: abnormal status 0x%X on port 0x%lX\n",
987 status, l);
988 }
989
990 return status;
991 }
992
993 static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
994 {
995 qc->tf.ctl |= ATA_NIEN;
996 }
997
998 static inline struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
999 unsigned int tag)
1000 {
1001 if (likely(ata_tag_valid(tag)))
1002 return &ap->qcmd[tag];
1003 return NULL;
1004 }
1005
1006 static inline struct ata_queued_cmd *ata_qc_from_tag(struct ata_port *ap,
1007 unsigned int tag)
1008 {
1009 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
1010
1011 if (unlikely(!qc) || !ap->ops->error_handler)
1012 return qc;
1013
1014 if ((qc->flags & (ATA_QCFLAG_ACTIVE |
1015 ATA_QCFLAG_FAILED)) == ATA_QCFLAG_ACTIVE)
1016 return qc;
1017
1018 return NULL;
1019 }
1020
1021 static inline void ata_tf_init(struct ata_device *dev, struct ata_taskfile *tf)
1022 {
1023 memset(tf, 0, sizeof(*tf));
1024
1025 tf->ctl = dev->ap->ctl;
1026 if (dev->devno == 0)
1027 tf->device = ATA_DEVICE_OBS;
1028 else
1029 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
1030 }
1031
1032 static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
1033 {
1034 qc->__sg = NULL;
1035 qc->flags = 0;
1036 qc->cursect = qc->cursg = qc->cursg_ofs = 0;
1037 qc->nsect = 0;
1038 qc->nbytes = qc->curbytes = 0;
1039 qc->err_mask = 0;
1040
1041 ata_tf_init(qc->dev, &qc->tf);
1042
1043 /* init result_tf such that it indicates normal completion */
1044 qc->result_tf.command = ATA_DRDY;
1045 qc->result_tf.feature = 0;
1046 }
1047
1048 /**
1049 * ata_irq_on - Enable interrupts on a port.
1050 * @ap: Port on which interrupts are enabled.
1051 *
1052 * Enable interrupts on a legacy IDE device using MMIO or PIO,
1053 * wait for idle, clear any pending interrupts.
1054 *
1055 * LOCKING:
1056 * Inherited from caller.
1057 */
1058
1059 static inline u8 ata_irq_on(struct ata_port *ap)
1060 {
1061 struct ata_ioports *ioaddr = &ap->ioaddr;
1062 u8 tmp;
1063
1064 ap->ctl &= ~ATA_NIEN;
1065 ap->last_ctl = ap->ctl;
1066
1067 if (ap->flags & ATA_FLAG_MMIO)
1068 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1069 else
1070 outb(ap->ctl, ioaddr->ctl_addr);
1071 tmp = ata_wait_idle(ap);
1072
1073 ap->ops->irq_clear(ap);
1074
1075 return tmp;
1076 }
1077
1078
1079 /**
1080 * ata_irq_ack - Acknowledge a device interrupt.
1081 * @ap: Port on which interrupts are enabled.
1082 *
1083 * Wait up to 10 ms for legacy IDE device to become idle (BUSY
1084 * or BUSY+DRQ clear). Obtain dma status and port status from
1085 * device. Clear the interrupt. Return port status.
1086 *
1087 * LOCKING:
1088 */
1089
1090 static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
1091 {
1092 unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
1093 u8 host_stat, post_stat, status;
1094
1095 status = ata_busy_wait(ap, bits, 1000);
1096 if (status & bits)
1097 if (ata_msg_err(ap))
1098 printk(KERN_ERR "abnormal status 0x%X\n", status);
1099
1100 /* get controller status; clear intr, err bits */
1101 if (ap->flags & ATA_FLAG_MMIO) {
1102 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
1103 host_stat = readb(mmio + ATA_DMA_STATUS);
1104 writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
1105 mmio + ATA_DMA_STATUS);
1106
1107 post_stat = readb(mmio + ATA_DMA_STATUS);
1108 } else {
1109 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
1110 outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
1111 ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
1112
1113 post_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
1114 }
1115
1116 if (ata_msg_intr(ap))
1117 printk(KERN_INFO "%s: irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
1118 __FUNCTION__,
1119 host_stat, post_stat, status);
1120
1121 return status;
1122 }
1123
1124 static inline int ata_try_flush_cache(const struct ata_device *dev)
1125 {
1126 return ata_id_wcache_enabled(dev->id) ||
1127 ata_id_has_flush(dev->id) ||
1128 ata_id_has_flush_ext(dev->id);
1129 }
1130
1131 static inline unsigned int ac_err_mask(u8 status)
1132 {
1133 if (status & (ATA_BUSY | ATA_DRQ))
1134 return AC_ERR_HSM;
1135 if (status & (ATA_ERR | ATA_DF))
1136 return AC_ERR_DEV;
1137 return 0;
1138 }
1139
1140 static inline unsigned int __ac_err_mask(u8 status)
1141 {
1142 unsigned int mask = ac_err_mask(status);
1143 if (mask == 0)
1144 return AC_ERR_OTHER;
1145 return mask;
1146 }
1147
1148 static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev)
1149 {
1150 ap->pad_dma = 0;
1151 ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ,
1152 &ap->pad_dma, GFP_KERNEL);
1153 return (ap->pad == NULL) ? -ENOMEM : 0;
1154 }
1155
1156 static inline void ata_pad_free(struct ata_port *ap, struct device *dev)
1157 {
1158 dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
1159 }
1160
1161 static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
1162 {
1163 return (struct ata_port *) &host->hostdata[0];
1164 }
1165
1166 #endif /* __LINUX_LIBATA_H__ */
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