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libata: add missing CONFIG_PM in LLDs
[deliverable/linux.git] / include / linux / libata.h
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1/*
2 * Copyright 2003-2005 Red Hat, Inc. All rights reserved.
3 * Copyright 2003-2005 Jeff Garzik
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2, or (at your option)
9 * any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; see the file COPYING. If not, write to
18 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
19 *
20 *
21 * libata documentation is available via 'make {ps|pdf}docs',
22 * as Documentation/DocBook/libata.*
23 *
24 */
25
26#ifndef __LINUX_LIBATA_H__
27#define __LINUX_LIBATA_H__
28
29#include <linux/delay.h>
30#include <linux/interrupt.h>
31#include <linux/pci.h>
32#include <linux/dma-mapping.h>
33#include <asm/scatterlist.h>
34#include <linux/io.h>
35#include <linux/ata.h>
36#include <linux/workqueue.h>
37#include <scsi/scsi_host.h>
38#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
78enum {
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
98static 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? */
111static inline struct device *pci_dev_to_dev(struct pci_dev *pdev)
112{
113 return &pdev->dev;
114}
115
116enum {
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
214 /* various lengths of time */
215 ATA_TMOUT_BOOT = 30 * HZ, /* heuristic */
216 ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* heuristic */
217 ATA_TMOUT_INTERNAL = 30 * HZ,
218 ATA_TMOUT_INTERNAL_QUICK = 5 * HZ,
219
220 /* ATA bus states */
221 BUS_UNKNOWN = 0,
222 BUS_DMA = 1,
223 BUS_IDLE = 2,
224 BUS_NOINTR = 3,
225 BUS_NODATA = 4,
226 BUS_TIMER = 5,
227 BUS_PIO = 6,
228 BUS_EDD = 7,
229 BUS_IDENTIFY = 8,
230 BUS_PACKET = 9,
231
232 /* SATA port states */
233 PORT_UNKNOWN = 0,
234 PORT_ENABLED = 1,
235 PORT_DISABLED = 2,
236
237 /* encoding various smaller bitmaps into a single
238 * unsigned int bitmap
239 */
240 ATA_BITS_PIO = 7,
241 ATA_BITS_MWDMA = 5,
242 ATA_BITS_UDMA = 8,
243
244 ATA_SHIFT_PIO = 0,
245 ATA_SHIFT_MWDMA = ATA_SHIFT_PIO + ATA_BITS_PIO,
246 ATA_SHIFT_UDMA = ATA_SHIFT_MWDMA + ATA_BITS_MWDMA,
247
248 ATA_MASK_PIO = ((1 << ATA_BITS_PIO) - 1) << ATA_SHIFT_PIO,
249 ATA_MASK_MWDMA = ((1 << ATA_BITS_MWDMA) - 1) << ATA_SHIFT_MWDMA,
250 ATA_MASK_UDMA = ((1 << ATA_BITS_UDMA) - 1) << ATA_SHIFT_UDMA,
251
252 /* size of buffer to pad xfers ending on unaligned boundaries */
253 ATA_DMA_PAD_SZ = 4,
254 ATA_DMA_PAD_BUF_SZ = ATA_DMA_PAD_SZ * ATA_MAX_QUEUE,
255
256 /* masks for port functions */
257 ATA_PORT_PRIMARY = (1 << 0),
258 ATA_PORT_SECONDARY = (1 << 1),
259
260 /* ering size */
261 ATA_ERING_SIZE = 32,
262
263 /* desc_len for ata_eh_info and context */
264 ATA_EH_DESC_LEN = 80,
265
266 /* reset / recovery action types */
267 ATA_EH_REVALIDATE = (1 << 0),
268 ATA_EH_SOFTRESET = (1 << 1),
269 ATA_EH_HARDRESET = (1 << 2),
270 ATA_EH_SUSPEND = (1 << 3),
271 ATA_EH_RESUME = (1 << 4),
272 ATA_EH_PM_FREEZE = (1 << 5),
273
274 ATA_EH_RESET_MASK = ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
275 ATA_EH_PERDEV_MASK = ATA_EH_REVALIDATE | ATA_EH_SUSPEND |
276 ATA_EH_RESUME | ATA_EH_PM_FREEZE,
277
278 /* ata_eh_info->flags */
279 ATA_EHI_HOTPLUGGED = (1 << 0), /* could have been hotplugged */
280 ATA_EHI_RESUME_LINK = (1 << 1), /* resume link (reset modifier) */
281 ATA_EHI_NO_AUTOPSY = (1 << 2), /* no autopsy */
282 ATA_EHI_QUIET = (1 << 3), /* be quiet */
283
284 ATA_EHI_DID_RESET = (1 << 16), /* already reset this port */
285 ATA_EHI_PRINTINFO = (1 << 17), /* print configuration info */
286 ATA_EHI_SETMODE = (1 << 18), /* configure transfer mode */
287 ATA_EHI_POST_SETMODE = (1 << 19), /* revaildating after setmode */
288
289 ATA_EHI_RESET_MODIFIER_MASK = ATA_EHI_RESUME_LINK,
290
291 /* max repeat if error condition is still set after ->error_handler */
292 ATA_EH_MAX_REPEAT = 5,
293
294 /* how hard are we gonna try to probe/recover devices */
295 ATA_PROBE_MAX_TRIES = 3,
296 ATA_EH_RESET_TRIES = 3,
297 ATA_EH_DEV_TRIES = 3,
298
299 /* Drive spinup time (time from power-on to the first D2H FIS)
300 * in msecs - 8s currently. Failing to get ready in this time
301 * isn't critical. It will result in reset failure for
302 * controllers which can't wait for the first D2H FIS. libata
303 * will retry, so it just has to be long enough to spin up
304 * most devices.
305 */
306 ATA_SPINUP_WAIT = 8000,
307
308 /* Horkage types. May be set by libata or controller on drives
309 (some horkage may be drive/controller pair dependant */
310
311 ATA_HORKAGE_DIAGNOSTIC = (1 << 0), /* Failed boot diag */
312 ATA_HORKAGE_NODMA = (1 << 1), /* DMA problems */
313 ATA_HORKAGE_NONCQ = (1 << 2), /* Don't use NCQ */
314};
315
316enum hsm_task_states {
317 HSM_ST_IDLE, /* no command on going */
318 HSM_ST, /* (waiting the device to) transfer data */
319 HSM_ST_LAST, /* (waiting the device to) complete command */
320 HSM_ST_ERR, /* error */
321 HSM_ST_FIRST, /* (waiting the device to)
322 write CDB or first data block */
323};
324
325enum ata_completion_errors {
326 AC_ERR_DEV = (1 << 0), /* device reported error */
327 AC_ERR_HSM = (1 << 1), /* host state machine violation */
328 AC_ERR_TIMEOUT = (1 << 2), /* timeout */
329 AC_ERR_MEDIA = (1 << 3), /* media error */
330 AC_ERR_ATA_BUS = (1 << 4), /* ATA bus error */
331 AC_ERR_HOST_BUS = (1 << 5), /* host bus error */
332 AC_ERR_SYSTEM = (1 << 6), /* system error */
333 AC_ERR_INVALID = (1 << 7), /* invalid argument */
334 AC_ERR_OTHER = (1 << 8), /* unknown */
335 AC_ERR_NODEV_HINT = (1 << 9), /* polling device detection hint */
336};
337
338/* forward declarations */
339struct scsi_device;
340struct ata_port_operations;
341struct ata_port;
342struct ata_queued_cmd;
343
344/* typedefs */
345typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
346typedef int (*ata_prereset_fn_t)(struct ata_port *ap);
347typedef int (*ata_reset_fn_t)(struct ata_port *ap, unsigned int *classes);
348typedef void (*ata_postreset_fn_t)(struct ata_port *ap, unsigned int *classes);
349
350struct ata_ioports {
351 void __iomem *cmd_addr;
352 void __iomem *data_addr;
353 void __iomem *error_addr;
354 void __iomem *feature_addr;
355 void __iomem *nsect_addr;
356 void __iomem *lbal_addr;
357 void __iomem *lbam_addr;
358 void __iomem *lbah_addr;
359 void __iomem *device_addr;
360 void __iomem *status_addr;
361 void __iomem *command_addr;
362 void __iomem *altstatus_addr;
363 void __iomem *ctl_addr;
364 void __iomem *bmdma_addr;
365 void __iomem *scr_addr;
366};
367
368struct ata_probe_ent {
369 struct list_head node;
370 struct device *dev;
371 const struct ata_port_operations *port_ops;
372 struct scsi_host_template *sht;
373 struct ata_ioports port[ATA_MAX_PORTS];
374 unsigned int n_ports;
375 unsigned int dummy_port_mask;
376 unsigned int pio_mask;
377 unsigned int mwdma_mask;
378 unsigned int udma_mask;
379 unsigned long irq;
380 unsigned long irq2;
381 unsigned int irq_flags;
382 unsigned long port_flags;
383 unsigned long _host_flags;
384 void __iomem * const *iomap;
385 void *private_data;
386
387 /* port_info for the secondary port. Together with irq2, it's
388 * used to implement non-uniform secondary port. Currently,
389 * the only user is ata_piix combined mode. This workaround
390 * will be removed together with ata_probe_ent when init model
391 * is updated.
392 */
393 const struct ata_port_info *pinfo2;
394};
395
396struct ata_host {
397 spinlock_t lock;
398 struct device *dev;
399 unsigned long irq;
400 unsigned long irq2;
401 void __iomem * const *iomap;
402 unsigned int n_ports;
403 void *private_data;
404 const struct ata_port_operations *ops;
405 unsigned long flags;
406 struct ata_port *simplex_claimed; /* channel owning the DMA */
407 struct ata_port *ports[0];
408};
409
410struct ata_queued_cmd {
411 struct ata_port *ap;
412 struct ata_device *dev;
413
414 struct scsi_cmnd *scsicmd;
415 void (*scsidone)(struct scsi_cmnd *);
416
417 struct ata_taskfile tf;
418 u8 cdb[ATAPI_CDB_LEN];
419
420 unsigned long flags; /* ATA_QCFLAG_xxx */
421 unsigned int tag;
422 unsigned int n_elem;
423 unsigned int orig_n_elem;
424
425 int dma_dir;
426
427 unsigned int pad_len;
428
429 unsigned int nbytes;
430 unsigned int curbytes;
431
432 unsigned int cursg;
433 unsigned int cursg_ofs;
434
435 struct scatterlist sgent;
436 struct scatterlist pad_sgent;
437 void *buf_virt;
438
439 /* DO NOT iterate over __sg manually, use ata_for_each_sg() */
440 struct scatterlist *__sg;
441
442 unsigned int err_mask;
443 struct ata_taskfile result_tf;
444 ata_qc_cb_t complete_fn;
445
446 void *private_data;
447};
448
449struct ata_port_stats {
450 unsigned long unhandled_irq;
451 unsigned long idle_irq;
452 unsigned long rw_reqbuf;
453};
454
455struct ata_ering_entry {
456 int is_io;
457 unsigned int err_mask;
458 u64 timestamp;
459};
460
461struct ata_ering {
462 int cursor;
463 struct ata_ering_entry ring[ATA_ERING_SIZE];
464};
465
466struct ata_device {
467 struct ata_port *ap;
468 unsigned int devno; /* 0 or 1 */
469 unsigned long flags; /* ATA_DFLAG_xxx */
470 struct scsi_device *sdev; /* attached SCSI device */
471 /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
472 u64 n_sectors; /* size of device, if ATA */
473 unsigned int class; /* ATA_DEV_xxx */
474 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
475 u8 pio_mode;
476 u8 dma_mode;
477 u8 xfer_mode;
478 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
479
480 unsigned int multi_count; /* sectors count for
481 READ/WRITE MULTIPLE */
482 unsigned int max_sectors; /* per-device max sectors */
483 unsigned int cdb_len;
484
485 /* per-dev xfer mask */
486 unsigned int pio_mask;
487 unsigned int mwdma_mask;
488 unsigned int udma_mask;
489
490 /* for CHS addressing */
491 u16 cylinders; /* Number of cylinders */
492 u16 heads; /* Number of heads */
493 u16 sectors; /* Number of sectors per track */
494
495 /* error history */
496 struct ata_ering ering;
497 int spdn_cnt;
498 unsigned int horkage; /* List of broken features */
499#ifdef CONFIG_SATA_ACPI
500 /* ACPI objects info */
501 acpi_handle obj_handle;
502#endif
503};
504
505/* Offset into struct ata_device. Fields above it are maintained
506 * acress device init. Fields below are zeroed.
507 */
508#define ATA_DEVICE_CLEAR_OFFSET offsetof(struct ata_device, n_sectors)
509
510struct ata_eh_info {
511 struct ata_device *dev; /* offending device */
512 u32 serror; /* SError from LLDD */
513 unsigned int err_mask; /* port-wide err_mask */
514 unsigned int action; /* ATA_EH_* action mask */
515 unsigned int dev_action[ATA_MAX_DEVICES]; /* dev EH action */
516 unsigned int flags; /* ATA_EHI_* flags */
517
518 unsigned long hotplug_timestamp;
519 unsigned int probe_mask;
520
521 char desc[ATA_EH_DESC_LEN];
522 int desc_len;
523};
524
525struct ata_eh_context {
526 struct ata_eh_info i;
527 int tries[ATA_MAX_DEVICES];
528 unsigned int classes[ATA_MAX_DEVICES];
529 unsigned int did_probe_mask;
530};
531
532struct ata_port {
533 struct Scsi_Host *scsi_host; /* our co-allocated scsi host */
534 const struct ata_port_operations *ops;
535 spinlock_t *lock;
536 unsigned long flags; /* ATA_FLAG_xxx */
537 unsigned int pflags; /* ATA_PFLAG_xxx */
538 unsigned int print_id; /* user visible unique port ID */
539 unsigned int port_no; /* 0 based port no. inside the host */
540
541 struct ata_prd *prd; /* our SG list */
542 dma_addr_t prd_dma; /* and its DMA mapping */
543
544 void *pad; /* array of DMA pad buffers */
545 dma_addr_t pad_dma;
546
547 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
548
549 u8 ctl; /* cache of ATA control register */
550 u8 last_ctl; /* Cache last written value */
551 unsigned int pio_mask;
552 unsigned int mwdma_mask;
553 unsigned int udma_mask;
554 unsigned int cbl; /* cable type; ATA_CBL_xxx */
555 unsigned int hw_sata_spd_limit;
556 unsigned int sata_spd_limit; /* SATA PHY speed limit */
557
558 /* record runtime error info, protected by host lock */
559 struct ata_eh_info eh_info;
560 /* EH context owned by EH */
561 struct ata_eh_context eh_context;
562
563 struct ata_device device[ATA_MAX_DEVICES];
564
565 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
566 unsigned long qc_allocated;
567 unsigned int qc_active;
568
569 unsigned int active_tag;
570 u32 sactive;
571
572 struct ata_port_stats stats;
573 struct ata_host *host;
574 struct device *dev;
575
576 void *port_task_data;
577 struct delayed_work port_task;
578 struct delayed_work hotplug_task;
579 struct work_struct scsi_rescan_task;
580
581 unsigned int hsm_task_state;
582
583 u32 msg_enable;
584 struct list_head eh_done_q;
585 wait_queue_head_t eh_wait_q;
586
587 pm_message_t pm_mesg;
588 int *pm_result;
589
590 void *private_data;
591
592 u8 sector_buf[ATA_SECT_SIZE]; /* owned by EH */
593};
594
595struct ata_port_operations {
596 void (*port_disable) (struct ata_port *);
597
598 void (*dev_config) (struct ata_port *, struct ata_device *);
599
600 void (*set_piomode) (struct ata_port *, struct ata_device *);
601 void (*set_dmamode) (struct ata_port *, struct ata_device *);
602 unsigned long (*mode_filter) (const struct ata_port *, struct ata_device *, unsigned long);
603
604 void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
605 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
606
607 void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
608 u8 (*check_status)(struct ata_port *ap);
609 u8 (*check_altstatus)(struct ata_port *ap);
610 void (*dev_select)(struct ata_port *ap, unsigned int device);
611
612 void (*phy_reset) (struct ata_port *ap); /* obsolete */
613 int (*set_mode) (struct ata_port *ap, struct ata_device **r_failed_dev);
614
615 void (*post_set_mode) (struct ata_port *ap);
616
617 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
618
619 void (*bmdma_setup) (struct ata_queued_cmd *qc);
620 void (*bmdma_start) (struct ata_queued_cmd *qc);
621
622 void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
623
624 void (*qc_prep) (struct ata_queued_cmd *qc);
625 unsigned int (*qc_issue) (struct ata_queued_cmd *qc);
626
627 /* Error handlers. ->error_handler overrides ->eng_timeout and
628 * indicates that new-style EH is in place.
629 */
630 void (*eng_timeout) (struct ata_port *ap); /* obsolete */
631
632 void (*freeze) (struct ata_port *ap);
633 void (*thaw) (struct ata_port *ap);
634 void (*error_handler) (struct ata_port *ap);
635 void (*post_internal_cmd) (struct ata_queued_cmd *qc);
636
637 irq_handler_t irq_handler;
638 void (*irq_clear) (struct ata_port *);
639 u8 (*irq_on) (struct ata_port *);
640 u8 (*irq_ack) (struct ata_port *ap, unsigned int chk_drq);
641
642 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
643 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
644 u32 val);
645
646 int (*port_suspend) (struct ata_port *ap, pm_message_t mesg);
647 int (*port_resume) (struct ata_port *ap);
648
649 int (*port_start) (struct ata_port *ap);
650 void (*port_stop) (struct ata_port *ap);
651
652 void (*host_stop) (struct ata_host *host);
653
654 void (*bmdma_stop) (struct ata_queued_cmd *qc);
655 u8 (*bmdma_status) (struct ata_port *ap);
656};
657
658struct ata_port_info {
659 struct scsi_host_template *sht;
660 unsigned long flags;
661 unsigned long pio_mask;
662 unsigned long mwdma_mask;
663 unsigned long udma_mask;
664 const struct ata_port_operations *port_ops;
665 void *private_data;
666};
667
668struct ata_timing {
669 unsigned short mode; /* ATA mode */
670 unsigned short setup; /* t1 */
671 unsigned short act8b; /* t2 for 8-bit I/O */
672 unsigned short rec8b; /* t2i for 8-bit I/O */
673 unsigned short cyc8b; /* t0 for 8-bit I/O */
674 unsigned short active; /* t2 or tD */
675 unsigned short recover; /* t2i or tK */
676 unsigned short cycle; /* t0 */
677 unsigned short udma; /* t2CYCTYP/2 */
678};
679
680#define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
681
682extern const unsigned long sata_deb_timing_normal[];
683extern const unsigned long sata_deb_timing_hotplug[];
684extern const unsigned long sata_deb_timing_long[];
685
686extern const struct ata_port_operations ata_dummy_port_ops;
687
688static inline const unsigned long *
689sata_ehc_deb_timing(struct ata_eh_context *ehc)
690{
691 if (ehc->i.flags & ATA_EHI_HOTPLUGGED)
692 return sata_deb_timing_hotplug;
693 else
694 return sata_deb_timing_normal;
695}
696
697static inline int ata_port_is_dummy(struct ata_port *ap)
698{
699 return ap->ops == &ata_dummy_port_ops;
700}
701
702extern void ata_port_probe(struct ata_port *);
703extern void __sata_phy_reset(struct ata_port *ap);
704extern void sata_phy_reset(struct ata_port *ap);
705extern void ata_bus_reset(struct ata_port *ap);
706extern int sata_set_spd(struct ata_port *ap);
707extern int sata_phy_debounce(struct ata_port *ap, const unsigned long *param);
708extern int sata_phy_resume(struct ata_port *ap, const unsigned long *param);
709extern int ata_std_prereset(struct ata_port *ap);
710extern int ata_std_softreset(struct ata_port *ap, unsigned int *classes);
711extern int sata_port_hardreset(struct ata_port *ap,
712 const unsigned long *timing);
713extern int sata_std_hardreset(struct ata_port *ap, unsigned int *class);
714extern void ata_std_postreset(struct ata_port *ap, unsigned int *classes);
715extern void ata_port_disable(struct ata_port *);
716extern void ata_std_ports(struct ata_ioports *ioaddr);
717#ifdef CONFIG_PCI
718extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
719 unsigned int n_ports);
720extern void ata_pci_remove_one (struct pci_dev *pdev);
721extern void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg);
722extern int __must_check ata_pci_device_do_resume(struct pci_dev *pdev);
723extern int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
724extern int ata_pci_device_resume(struct pci_dev *pdev);
725extern int ata_pci_clear_simplex(struct pci_dev *pdev);
726#endif /* CONFIG_PCI */
727extern int ata_device_add(const struct ata_probe_ent *ent);
728extern void ata_host_detach(struct ata_host *host);
729extern void ata_host_init(struct ata_host *, struct device *,
730 unsigned long, const struct ata_port_operations *);
731extern int ata_scsi_detect(struct scsi_host_template *sht);
732extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
733extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
734extern void ata_sas_port_destroy(struct ata_port *);
735extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
736 struct ata_port_info *, struct Scsi_Host *);
737extern int ata_sas_port_init(struct ata_port *);
738extern int ata_sas_port_start(struct ata_port *ap);
739extern void ata_sas_port_stop(struct ata_port *ap);
740extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
741extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
742 struct ata_port *ap);
743extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
744extern int sata_scr_valid(struct ata_port *ap);
745extern int sata_scr_read(struct ata_port *ap, int reg, u32 *val);
746extern int sata_scr_write(struct ata_port *ap, int reg, u32 val);
747extern int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val);
748extern int ata_port_online(struct ata_port *ap);
749extern int ata_port_offline(struct ata_port *ap);
750extern int ata_scsi_device_resume(struct scsi_device *);
751extern int ata_scsi_device_suspend(struct scsi_device *, pm_message_t mesg);
752extern int ata_host_suspend(struct ata_host *host, pm_message_t mesg);
753extern void ata_host_resume(struct ata_host *host);
754extern int ata_ratelimit(void);
755extern int ata_busy_sleep(struct ata_port *ap,
756 unsigned long timeout_pat, unsigned long timeout);
757extern void ata_port_queue_task(struct ata_port *ap, work_func_t fn,
758 void *data, unsigned long delay);
759extern u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
760 unsigned long interval_msec,
761 unsigned long timeout_msec);
762extern unsigned int ata_dev_try_classify(struct ata_port *, unsigned int, u8 *);
763
764/*
765 * Default driver ops implementations
766 */
767extern void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
768extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
769extern void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp);
770extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
771extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
772extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
773extern u8 ata_check_status(struct ata_port *ap);
774extern u8 ata_altstatus(struct ata_port *ap);
775extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf);
776extern int ata_port_start (struct ata_port *ap);
777extern irqreturn_t ata_interrupt (int irq, void *dev_instance);
778extern void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
779 unsigned int buflen, int write_data);
780extern void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
781 unsigned int buflen, int write_data);
782extern void ata_qc_prep(struct ata_queued_cmd *qc);
783extern void ata_noop_qc_prep(struct ata_queued_cmd *qc);
784extern unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc);
785extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
786 unsigned int buflen);
787extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
788 unsigned int n_elem);
789extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
790extern void ata_dev_disable(struct ata_device *adev);
791extern void ata_id_string(const u16 *id, unsigned char *s,
792 unsigned int ofs, unsigned int len);
793extern void ata_id_c_string(const u16 *id, unsigned char *s,
794 unsigned int ofs, unsigned int len);
795extern void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown);
796extern unsigned long ata_device_blacklisted(const struct ata_device *dev);
797extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
798extern void ata_bmdma_start (struct ata_queued_cmd *qc);
799extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
800extern u8 ata_bmdma_status(struct ata_port *ap);
801extern void ata_bmdma_irq_clear(struct ata_port *ap);
802extern void ata_bmdma_freeze(struct ata_port *ap);
803extern void ata_bmdma_thaw(struct ata_port *ap);
804extern void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
805 ata_reset_fn_t softreset,
806 ata_reset_fn_t hardreset,
807 ata_postreset_fn_t postreset);
808extern void ata_bmdma_error_handler(struct ata_port *ap);
809extern void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc);
810extern int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
811 u8 status, int in_wq);
812extern void ata_qc_complete(struct ata_queued_cmd *qc);
813extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
814 void (*finish_qc)(struct ata_queued_cmd *));
815extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
816 void (*done)(struct scsi_cmnd *));
817extern int ata_std_bios_param(struct scsi_device *sdev,
818 struct block_device *bdev,
819 sector_t capacity, int geom[]);
820extern int ata_scsi_slave_config(struct scsi_device *sdev);
821extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
822extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
823 int queue_depth);
824extern struct ata_device *ata_dev_pair(struct ata_device *adev);
825extern u8 ata_irq_on(struct ata_port *ap);
826extern u8 ata_dummy_irq_on(struct ata_port *ap);
827extern u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq);
828extern u8 ata_dummy_irq_ack(struct ata_port *ap, unsigned int chk_drq);
829
830/*
831 * Timing helpers
832 */
833
834extern unsigned int ata_pio_need_iordy(const struct ata_device *);
835extern int ata_timing_compute(struct ata_device *, unsigned short,
836 struct ata_timing *, int, int);
837extern void ata_timing_merge(const struct ata_timing *,
838 const struct ata_timing *, struct ata_timing *,
839 unsigned int);
840
841enum {
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
860struct 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
867extern struct ata_probe_ent *
868ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int portmask);
869extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);
870extern unsigned long ata_pci_default_filter(const struct ata_port *, struct ata_device *, unsigned long);
871#endif /* CONFIG_PCI */
872
873/*
874 * EH
875 */
876extern void ata_eng_timeout(struct ata_port *ap);
877
878extern void ata_port_schedule_eh(struct ata_port *ap);
879extern int ata_port_abort(struct ata_port *ap);
880extern int ata_port_freeze(struct ata_port *ap);
881
882extern void ata_eh_freeze_port(struct ata_port *ap);
883extern void ata_eh_thaw_port(struct ata_port *ap);
884
885extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
886extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
887
888extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
889 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
890 ata_postreset_fn_t postreset);
891
892/*
893 * printk helpers
894 */
895#define ata_port_printk(ap, lv, fmt, args...) \
896 printk(lv"ata%u: "fmt, (ap)->print_id , ##args)
897
898#define ata_dev_printk(dev, lv, fmt, args...) \
899 printk(lv"ata%u.%02u: "fmt, (dev)->ap->print_id, (dev)->devno , ##args)
900
901/*
902 * ata_eh_info helpers
903 */
904#define ata_ehi_push_desc(ehi, fmt, args...) do { \
905 (ehi)->desc_len += scnprintf((ehi)->desc + (ehi)->desc_len, \
906 ATA_EH_DESC_LEN - (ehi)->desc_len, \
907 fmt , ##args); \
908} while (0)
909
910#define ata_ehi_clear_desc(ehi) do { \
911 (ehi)->desc[0] = '\0'; \
912 (ehi)->desc_len = 0; \
913} while (0)
914
915static inline void __ata_ehi_hotplugged(struct ata_eh_info *ehi)
916{
917 if (ehi->flags & ATA_EHI_HOTPLUGGED)
918 return;
919
920 ehi->flags |= ATA_EHI_HOTPLUGGED | ATA_EHI_RESUME_LINK;
921 ehi->hotplug_timestamp = jiffies;
922
923 ehi->action |= ATA_EH_SOFTRESET;
924 ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
925}
926
927static inline void ata_ehi_hotplugged(struct ata_eh_info *ehi)
928{
929 __ata_ehi_hotplugged(ehi);
930 ehi->err_mask |= AC_ERR_ATA_BUS;
931}
932
933/*
934 * qc helpers
935 */
936static inline int
937ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
938{
939 if (sg == &qc->pad_sgent)
940 return 1;
941 if (qc->pad_len)
942 return 0;
943 if (((sg - qc->__sg) + 1) == qc->n_elem)
944 return 1;
945 return 0;
946}
947
948static inline struct scatterlist *
949ata_qc_first_sg(struct ata_queued_cmd *qc)
950{
951 if (qc->n_elem)
952 return qc->__sg;
953 if (qc->pad_len)
954 return &qc->pad_sgent;
955 return NULL;
956}
957
958static inline struct scatterlist *
959ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
960{
961 if (sg == &qc->pad_sgent)
962 return NULL;
963 if (++sg - qc->__sg < qc->n_elem)
964 return sg;
965 if (qc->pad_len)
966 return &qc->pad_sgent;
967 return NULL;
968}
969
970#define ata_for_each_sg(sg, qc) \
971 for (sg = ata_qc_first_sg(qc); sg; sg = ata_qc_next_sg(sg, qc))
972
973static inline unsigned int ata_tag_valid(unsigned int tag)
974{
975 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
976}
977
978static inline unsigned int ata_tag_internal(unsigned int tag)
979{
980 return tag == ATA_MAX_QUEUE - 1;
981}
982
983/*
984 * device helpers
985 */
986static inline unsigned int ata_class_enabled(unsigned int class)
987{
988 return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI;
989}
990
991static inline unsigned int ata_class_disabled(unsigned int class)
992{
993 return class == ATA_DEV_ATA_UNSUP || class == ATA_DEV_ATAPI_UNSUP;
994}
995
996static inline unsigned int ata_class_absent(unsigned int class)
997{
998 return !ata_class_enabled(class) && !ata_class_disabled(class);
999}
1000
1001static inline unsigned int ata_dev_enabled(const struct ata_device *dev)
1002{
1003 return ata_class_enabled(dev->class);
1004}
1005
1006static inline unsigned int ata_dev_disabled(const struct ata_device *dev)
1007{
1008 return ata_class_disabled(dev->class);
1009}
1010
1011static inline unsigned int ata_dev_absent(const struct ata_device *dev)
1012{
1013 return ata_class_absent(dev->class);
1014}
1015
1016static inline unsigned int ata_dev_ready(const struct ata_device *dev)
1017{
1018 return ata_dev_enabled(dev) && !(dev->flags & ATA_DFLAG_SUSPENDED);
1019}
1020
1021/*
1022 * port helpers
1023 */
1024static inline int ata_port_max_devices(const struct ata_port *ap)
1025{
1026 if (ap->flags & ATA_FLAG_SLAVE_POSS)
1027 return 2;
1028 return 1;
1029}
1030
1031
1032static inline u8 ata_chk_status(struct ata_port *ap)
1033{
1034 return ap->ops->check_status(ap);
1035}
1036
1037/**
1038 * ata_ncq_enabled - Test whether NCQ is enabled
1039 * @dev: ATA device to test for
1040 *
1041 * LOCKING:
1042 * spin_lock_irqsave(host lock)
1043 *
1044 * RETURNS:
1045 * 1 if NCQ is enabled for @dev, 0 otherwise.
1046 */
1047static inline int ata_ncq_enabled(struct ata_device *dev)
1048{
1049 return (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
1050 ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ;
1051}
1052
1053/**
1054 * ata_pause - Flush writes and pause 400 nanoseconds.
1055 * @ap: Port to wait for.
1056 *
1057 * LOCKING:
1058 * Inherited from caller.
1059 */
1060
1061static inline void ata_pause(struct ata_port *ap)
1062{
1063 ata_altstatus(ap);
1064 ndelay(400);
1065}
1066
1067
1068/**
1069 * ata_busy_wait - Wait for a port status register
1070 * @ap: Port to wait for.
1071 * @bits: bits that must be clear
1072 * @max: number of 10uS waits to perform
1073 *
1074 * Waits up to max*10 microseconds for the selected bits in the port's
1075 * status register to be cleared.
1076 * Returns final value of status register.
1077 *
1078 * LOCKING:
1079 * Inherited from caller.
1080 */
1081
1082static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
1083 unsigned int max)
1084{
1085 u8 status;
1086
1087 do {
1088 udelay(10);
1089 status = ata_chk_status(ap);
1090 max--;
1091 } while (status != 0xff && (status & bits) && (max > 0));
1092
1093 return status;
1094}
1095
1096
1097/**
1098 * ata_wait_idle - Wait for a port to be idle.
1099 * @ap: Port to wait for.
1100 *
1101 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
1102 * Returns final value of status register.
1103 *
1104 * LOCKING:
1105 * Inherited from caller.
1106 */
1107
1108static inline u8 ata_wait_idle(struct ata_port *ap)
1109{
1110 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
1111
1112 if (status != 0xff && (status & (ATA_BUSY | ATA_DRQ))) {
1113 if (ata_msg_warn(ap))
1114 printk(KERN_WARNING "ATA: abnormal status 0x%X on port 0x%p\n",
1115 status, ap->ioaddr.status_addr);
1116 }
1117
1118 return status;
1119}
1120
1121static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
1122{
1123 qc->tf.ctl |= ATA_NIEN;
1124}
1125
1126static inline struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
1127 unsigned int tag)
1128{
1129 if (likely(ata_tag_valid(tag)))
1130 return &ap->qcmd[tag];
1131 return NULL;
1132}
1133
1134static inline struct ata_queued_cmd *ata_qc_from_tag(struct ata_port *ap,
1135 unsigned int tag)
1136{
1137 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
1138
1139 if (unlikely(!qc) || !ap->ops->error_handler)
1140 return qc;
1141
1142 if ((qc->flags & (ATA_QCFLAG_ACTIVE |
1143 ATA_QCFLAG_FAILED)) == ATA_QCFLAG_ACTIVE)
1144 return qc;
1145
1146 return NULL;
1147}
1148
1149static inline void ata_tf_init(struct ata_device *dev, struct ata_taskfile *tf)
1150{
1151 memset(tf, 0, sizeof(*tf));
1152
1153 tf->ctl = dev->ap->ctl;
1154 if (dev->devno == 0)
1155 tf->device = ATA_DEVICE_OBS;
1156 else
1157 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
1158}
1159
1160static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
1161{
1162 qc->dma_dir = DMA_NONE;
1163 qc->__sg = NULL;
1164 qc->flags = 0;
1165 qc->cursg = qc->cursg_ofs = 0;
1166 qc->nbytes = qc->curbytes = 0;
1167 qc->n_elem = 0;
1168 qc->err_mask = 0;
1169 qc->pad_len = 0;
1170
1171 ata_tf_init(qc->dev, &qc->tf);
1172
1173 /* init result_tf such that it indicates normal completion */
1174 qc->result_tf.command = ATA_DRDY;
1175 qc->result_tf.feature = 0;
1176}
1177
1178static inline int ata_try_flush_cache(const struct ata_device *dev)
1179{
1180 return ata_id_wcache_enabled(dev->id) ||
1181 ata_id_has_flush(dev->id) ||
1182 ata_id_has_flush_ext(dev->id);
1183}
1184
1185static inline unsigned int ac_err_mask(u8 status)
1186{
1187 if (status & (ATA_BUSY | ATA_DRQ))
1188 return AC_ERR_HSM;
1189 if (status & (ATA_ERR | ATA_DF))
1190 return AC_ERR_DEV;
1191 return 0;
1192}
1193
1194static inline unsigned int __ac_err_mask(u8 status)
1195{
1196 unsigned int mask = ac_err_mask(status);
1197 if (mask == 0)
1198 return AC_ERR_OTHER;
1199 return mask;
1200}
1201
1202static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev)
1203{
1204 ap->pad_dma = 0;
1205 ap->pad = dmam_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ,
1206 &ap->pad_dma, GFP_KERNEL);
1207 return (ap->pad == NULL) ? -ENOMEM : 0;
1208}
1209
1210static inline void ata_pad_free(struct ata_port *ap, struct device *dev)
1211{
1212 dmam_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
1213}
1214
1215static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
1216{
1217 return (struct ata_port *) &host->hostdata[0];
1218}
1219
1220#endif /* __LINUX_LIBATA_H__ */
Linux kernel - Deliverables
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