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[libata passthru] address slave devices correctly
[linux-2.6/linux-loongson.git] / include / linux / libata.h
blobad5996183ec2fcfa83c0c0068f7774cb0112f3e3
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
37 /*
38 * compile-time options
39 */
40 #undef ATA_DEBUG /* debugging output */
41 #undef ATA_VERBOSE_DEBUG /* yet more debugging output */
42 #undef ATA_IRQ_TRAP /* define to ack screaming irqs */
43 #undef ATA_NDEBUG /* define to disable quick runtime checks */
44 #undef ATA_ENABLE_PATA /* define to enable PATA support in some
45 * low-level drivers */
46 #undef ATAPI_ENABLE_DMADIR /* enables ATAPI DMADIR bridge support */
47
48
49 /* note: prints function name for you */
50 #ifdef ATA_DEBUG
51 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
52 #ifdef ATA_VERBOSE_DEBUG
53 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
54 #else
55 #define VPRINTK(fmt, args...)
56 #endif /* ATA_VERBOSE_DEBUG */
57 #else
58 #define DPRINTK(fmt, args...)
59 #define VPRINTK(fmt, args...)
60 #endif /* ATA_DEBUG */
61
62 #ifdef ATA_NDEBUG
63 #define assert(expr)
64 #else
65 #define assert(expr) \
66 if(unlikely(!(expr))) { \
67 printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
68 #expr,__FILE__,__FUNCTION__,__LINE__); \
69 }
70 #endif
71
72 /* defines only for the constants which don't work well as enums */
73 #define ATA_TAG_POISON 0xfafbfcfdU
74
75 /* move to PCI layer? */
76 static inline struct device *pci_dev_to_dev(struct pci_dev *pdev)
77 {
78 return &pdev->dev;
79 }
80
81 enum {
82 /* various global constants */
83 LIBATA_MAX_PRD = ATA_MAX_PRD / 2,
84 ATA_MAX_PORTS = 8,
85 ATA_DEF_QUEUE = 1,
86 ATA_MAX_QUEUE = 1,
87 ATA_MAX_SECTORS = 200, /* FIXME */
88 ATA_MAX_BUS = 2,
89 ATA_DEF_BUSY_WAIT = 10000,
90 ATA_SHORT_PAUSE = (HZ >> 6) + 1,
91
92 ATA_SHT_EMULATED = 1,
93 ATA_SHT_CMD_PER_LUN = 1,
94 ATA_SHT_THIS_ID = -1,
95 ATA_SHT_USE_CLUSTERING = 1,
96
97 /* struct ata_device stuff */
98 ATA_DFLAG_LBA48 = (1 << 0), /* device supports LBA48 */
99 ATA_DFLAG_PIO = (1 << 1), /* device currently in PIO mode */
100 ATA_DFLAG_LOCK_SECTORS = (1 << 2), /* don't adjust max_sectors */
101 ATA_DFLAG_LBA = (1 << 3), /* device supports LBA */
102
103 ATA_DEV_UNKNOWN = 0, /* unknown device */
104 ATA_DEV_ATA = 1, /* ATA device */
105 ATA_DEV_ATA_UNSUP = 2, /* ATA device (unsupported) */
106 ATA_DEV_ATAPI = 3, /* ATAPI device */
107 ATA_DEV_ATAPI_UNSUP = 4, /* ATAPI device (unsupported) */
108 ATA_DEV_NONE = 5, /* no device */
109
110 /* struct ata_port flags */
111 ATA_FLAG_SLAVE_POSS = (1 << 1), /* host supports slave dev */
112 /* (doesn't imply presence) */
113 ATA_FLAG_PORT_DISABLED = (1 << 2), /* port is disabled, ignore it */
114 ATA_FLAG_SATA = (1 << 3),
115 ATA_FLAG_NO_LEGACY = (1 << 4), /* no legacy mode check */
116 ATA_FLAG_SRST = (1 << 5), /* use ATA SRST, not E.D.D. */
117 ATA_FLAG_MMIO = (1 << 6), /* use MMIO, not PIO */
118 ATA_FLAG_SATA_RESET = (1 << 7), /* use COMRESET */
119 ATA_FLAG_PIO_DMA = (1 << 8), /* PIO cmds via DMA */
120 ATA_FLAG_NOINTR = (1 << 9), /* FIXME: Remove this once
121 * proper HSM is in place. */
122
123 ATA_QCFLAG_ACTIVE = (1 << 1), /* cmd not yet ack'd to scsi lyer */
124 ATA_QCFLAG_SG = (1 << 3), /* have s/g table? */
125 ATA_QCFLAG_SINGLE = (1 << 4), /* no s/g, just a single buffer */
126 ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
127
128 /* various lengths of time */
129 ATA_TMOUT_EDD = 5 * HZ, /* hueristic */
130 ATA_TMOUT_PIO = 30 * HZ,
131 ATA_TMOUT_BOOT = 30 * HZ, /* hueristic */
132 ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* hueristic */
133 ATA_TMOUT_CDB = 30 * HZ,
134 ATA_TMOUT_CDB_QUICK = 5 * HZ,
135
136 /* ATA bus states */
137 BUS_UNKNOWN = 0,
138 BUS_DMA = 1,
139 BUS_IDLE = 2,
140 BUS_NOINTR = 3,
141 BUS_NODATA = 4,
142 BUS_TIMER = 5,
143 BUS_PIO = 6,
144 BUS_EDD = 7,
145 BUS_IDENTIFY = 8,
146 BUS_PACKET = 9,
147
148 /* SATA port states */
149 PORT_UNKNOWN = 0,
150 PORT_ENABLED = 1,
151 PORT_DISABLED = 2,
152
153 /* encoding various smaller bitmaps into a single
154 * unsigned long bitmap
155 */
156 ATA_SHIFT_UDMA = 0,
157 ATA_SHIFT_MWDMA = 8,
158 ATA_SHIFT_PIO = 11,
159
160 /* size of buffer to pad xfers ending on unaligned boundaries */
161 ATA_DMA_PAD_SZ = 4,
162 ATA_DMA_PAD_BUF_SZ = ATA_DMA_PAD_SZ * ATA_MAX_QUEUE,
163
164 /* Masks for port functions */
165 ATA_PORT_PRIMARY = (1 << 0),
166 ATA_PORT_SECONDARY = (1 << 1),
167 };
168
169 enum hsm_task_states {
170 HSM_ST_UNKNOWN,
171 HSM_ST_IDLE,
172 HSM_ST_POLL,
173 HSM_ST_TMOUT,
174 HSM_ST,
175 HSM_ST_LAST,
176 HSM_ST_LAST_POLL,
177 HSM_ST_ERR,
178 };
179
180 enum ata_completion_errors {
181 AC_ERR_OTHER = (1 << 0),
182 AC_ERR_DEV = (1 << 1),
183 AC_ERR_ATA_BUS = (1 << 2),
184 AC_ERR_HOST_BUS = (1 << 3),
185 };
186
187 /* forward declarations */
188 struct scsi_device;
189 struct ata_port_operations;
190 struct ata_port;
191 struct ata_queued_cmd;
192
193 /* typedefs */
194 typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc, unsigned int err_mask);
195
196 struct ata_ioports {
197 unsigned long cmd_addr;
198 unsigned long data_addr;
199 unsigned long error_addr;
200 unsigned long feature_addr;
201 unsigned long nsect_addr;
202 unsigned long lbal_addr;
203 unsigned long lbam_addr;
204 unsigned long lbah_addr;
205 unsigned long device_addr;
206 unsigned long status_addr;
207 unsigned long command_addr;
208 unsigned long altstatus_addr;
209 unsigned long ctl_addr;
210 unsigned long bmdma_addr;
211 unsigned long scr_addr;
212 };
213
214 struct ata_probe_ent {
215 struct list_head node;
216 struct device *dev;
217 const struct ata_port_operations *port_ops;
218 struct scsi_host_template *sht;
219 struct ata_ioports port[ATA_MAX_PORTS];
220 unsigned int n_ports;
221 unsigned int hard_port_no;
222 unsigned int pio_mask;
223 unsigned int mwdma_mask;
224 unsigned int udma_mask;
225 unsigned int legacy_mode;
226 unsigned long irq;
227 unsigned int irq_flags;
228 unsigned long host_flags;
229 void __iomem *mmio_base;
230 void *private_data;
231 };
232
233 struct ata_host_set {
234 spinlock_t lock;
235 struct device *dev;
236 unsigned long irq;
237 void __iomem *mmio_base;
238 unsigned int n_ports;
239 void *private_data;
240 const struct ata_port_operations *ops;
241 struct ata_port * ports[0];
242 };
243
244 struct ata_queued_cmd {
245 struct ata_port *ap;
246 struct ata_device *dev;
247
248 struct scsi_cmnd *scsicmd;
249 void (*scsidone)(struct scsi_cmnd *);
250
251 struct ata_taskfile tf;
252 u8 cdb[ATAPI_CDB_LEN];
253
254 unsigned long flags; /* ATA_QCFLAG_xxx */
255 unsigned int tag;
256 unsigned int n_elem;
257 unsigned int orig_n_elem;
258
259 int dma_dir;
260
261 unsigned int pad_len;
262
263 unsigned int nsect;
264 unsigned int cursect;
265
266 unsigned int nbytes;
267 unsigned int curbytes;
268
269 unsigned int cursg;
270 unsigned int cursg_ofs;
271
272 struct scatterlist sgent;
273 struct scatterlist pad_sgent;
274 void *buf_virt;
275
276 /* DO NOT iterate over __sg manually, use ata_for_each_sg() */
277 struct scatterlist *__sg;
278
279 ata_qc_cb_t complete_fn;
280
281 struct completion *waiting;
282
283 void *private_data;
284 };
285
286 struct ata_host_stats {
287 unsigned long unhandled_irq;
288 unsigned long idle_irq;
289 unsigned long rw_reqbuf;
290 };
291
292 struct ata_device {
293 u64 n_sectors; /* size of device, if ATA */
294 unsigned long flags; /* ATA_DFLAG_xxx */
295 unsigned int class; /* ATA_DEV_xxx */
296 unsigned int devno; /* 0 or 1 */
297 u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
298 u8 pio_mode;
299 u8 dma_mode;
300 u8 xfer_mode;
301 unsigned int xfer_shift; /* ATA_SHIFT_xxx */
302
303 unsigned int multi_count; /* sectors count for
304 READ/WRITE MULTIPLE */
305
306 /* for CHS addressing */
307 u16 cylinders; /* Number of cylinders */
308 u16 heads; /* Number of heads */
309 u16 sectors; /* Number of sectors per track */
310 };
311
312 struct ata_port {
313 struct Scsi_Host *host; /* our co-allocated scsi host */
314 const struct ata_port_operations *ops;
315 unsigned long flags; /* ATA_FLAG_xxx */
316 unsigned int id; /* unique id req'd by scsi midlyr */
317 unsigned int port_no; /* unique port #; from zero */
318 unsigned int hard_port_no; /* hardware port #; from zero */
319
320 struct ata_prd *prd; /* our SG list */
321 dma_addr_t prd_dma; /* and its DMA mapping */
322
323 void *pad; /* array of DMA pad buffers */
324 dma_addr_t pad_dma;
325
326 struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
327
328 u8 ctl; /* cache of ATA control register */
329 u8 last_ctl; /* Cache last written value */
330 unsigned int bus_state;
331 unsigned int port_state;
332 unsigned int pio_mask;
333 unsigned int mwdma_mask;
334 unsigned int udma_mask;
335 unsigned int cbl; /* cable type; ATA_CBL_xxx */
336 unsigned int cdb_len;
337
338 struct ata_device device[ATA_MAX_DEVICES];
339
340 struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
341 unsigned long qactive;
342 unsigned int active_tag;
343
344 struct ata_host_stats stats;
345 struct ata_host_set *host_set;
346
347 struct work_struct packet_task;
348
349 struct work_struct pio_task;
350 unsigned int hsm_task_state;
351 unsigned long pio_task_timeout;
352
353 void *private_data;
354 };
355
356 struct ata_port_operations {
357 void (*port_disable) (struct ata_port *);
358
359 void (*dev_config) (struct ata_port *, struct ata_device *);
360
361 void (*set_piomode) (struct ata_port *, struct ata_device *);
362 void (*set_dmamode) (struct ata_port *, struct ata_device *);
363
364 void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
365 void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
366
367 void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
368 u8 (*check_status)(struct ata_port *ap);
369 u8 (*check_altstatus)(struct ata_port *ap);
370 void (*dev_select)(struct ata_port *ap, unsigned int device);
371
372 void (*phy_reset) (struct ata_port *ap);
373 void (*post_set_mode) (struct ata_port *ap);
374
375 int (*check_atapi_dma) (struct ata_queued_cmd *qc);
376
377 void (*bmdma_setup) (struct ata_queued_cmd *qc);
378 void (*bmdma_start) (struct ata_queued_cmd *qc);
379
380 void (*qc_prep) (struct ata_queued_cmd *qc);
381 int (*qc_issue) (struct ata_queued_cmd *qc);
382
383 void (*eng_timeout) (struct ata_port *ap);
384
385 irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
386 void (*irq_clear) (struct ata_port *);
387
388 u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
389 void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
390 u32 val);
391
392 int (*port_start) (struct ata_port *ap);
393 void (*port_stop) (struct ata_port *ap);
394
395 void (*host_stop) (struct ata_host_set *host_set);
396
397 void (*bmdma_stop) (struct ata_queued_cmd *qc);
398 u8 (*bmdma_status) (struct ata_port *ap);
399 };
400
401 struct ata_port_info {
402 struct scsi_host_template *sht;
403 unsigned long host_flags;
404 unsigned long pio_mask;
405 unsigned long mwdma_mask;
406 unsigned long udma_mask;
407 const struct ata_port_operations *port_ops;
408 void *private_data;
409 };
410
411 struct ata_timing {
412 unsigned short mode; /* ATA mode */
413 unsigned short setup; /* t1 */
414 unsigned short act8b; /* t2 for 8-bit I/O */
415 unsigned short rec8b; /* t2i for 8-bit I/O */
416 unsigned short cyc8b; /* t0 for 8-bit I/O */
417 unsigned short active; /* t2 or tD */
418 unsigned short recover; /* t2i or tK */
419 unsigned short cycle; /* t0 */
420 unsigned short udma; /* t2CYCTYP/2 */
421 };
422
423 #define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
424
425 extern void ata_port_probe(struct ata_port *);
426 extern void __sata_phy_reset(struct ata_port *ap);
427 extern void sata_phy_reset(struct ata_port *ap);
428 extern void ata_bus_reset(struct ata_port *ap);
429 extern void ata_port_disable(struct ata_port *);
430 extern void ata_std_ports(struct ata_ioports *ioaddr);
431 #ifdef CONFIG_PCI
432 extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
433 unsigned int n_ports);
434 extern void ata_pci_remove_one (struct pci_dev *pdev);
435 #endif /* CONFIG_PCI */
436 extern int ata_device_add(const struct ata_probe_ent *ent);
437 extern void ata_host_set_remove(struct ata_host_set *host_set);
438 extern int ata_scsi_detect(struct scsi_host_template *sht);
439 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
440 extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
441 extern int ata_scsi_error(struct Scsi_Host *host);
442 extern int ata_scsi_release(struct Scsi_Host *host);
443 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
444 extern int ata_ratelimit(void);
445
446 /*
447 * Default driver ops implementations
448 */
449 extern void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
450 extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
451 extern void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp);
452 extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
453 extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
454 extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
455 extern u8 ata_check_status(struct ata_port *ap);
456 extern u8 ata_altstatus(struct ata_port *ap);
457 extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf);
458 extern int ata_port_start (struct ata_port *ap);
459 extern void ata_port_stop (struct ata_port *ap);
460 extern void ata_host_stop (struct ata_host_set *host_set);
461 extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
462 extern void ata_qc_prep(struct ata_queued_cmd *qc);
463 extern int ata_qc_issue_prot(struct ata_queued_cmd *qc);
464 extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
465 unsigned int buflen);
466 extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
467 unsigned int n_elem);
468 extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
469 extern void ata_dev_id_string(const u16 *id, unsigned char *s,
470 unsigned int ofs, unsigned int len);
471 extern void ata_dev_config(struct ata_port *ap, unsigned int i);
472 extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
473 extern void ata_bmdma_start (struct ata_queued_cmd *qc);
474 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
475 extern u8 ata_bmdma_status(struct ata_port *ap);
476 extern void ata_bmdma_irq_clear(struct ata_port *ap);
477 extern void ata_qc_complete(struct ata_queued_cmd *qc, unsigned int err_mask);
478 extern void ata_eng_timeout(struct ata_port *ap);
479 extern void ata_scsi_simulate(u16 *id, struct scsi_cmnd *cmd,
480 void (*done)(struct scsi_cmnd *));
481 extern int ata_std_bios_param(struct scsi_device *sdev,
482 struct block_device *bdev,
483 sector_t capacity, int geom[]);
484 extern int ata_scsi_slave_config(struct scsi_device *sdev);
485
486 /*
487 * Timing helpers
488 */
489 extern int ata_timing_compute(struct ata_device *, unsigned short,
490 struct ata_timing *, int, int);
491 extern void ata_timing_merge(const struct ata_timing *,
492 const struct ata_timing *, struct ata_timing *,
493 unsigned int);
494
495 enum {
496 ATA_TIMING_SETUP = (1 << 0),
497 ATA_TIMING_ACT8B = (1 << 1),
498 ATA_TIMING_REC8B = (1 << 2),
499 ATA_TIMING_CYC8B = (1 << 3),
500 ATA_TIMING_8BIT = ATA_TIMING_ACT8B | ATA_TIMING_REC8B |
501 ATA_TIMING_CYC8B,
502 ATA_TIMING_ACTIVE = (1 << 4),
503 ATA_TIMING_RECOVER = (1 << 5),
504 ATA_TIMING_CYCLE = (1 << 6),
505 ATA_TIMING_UDMA = (1 << 7),
506 ATA_TIMING_ALL = ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
507 ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
508 ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
509 ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
510 };
511
512
513 #ifdef CONFIG_PCI
514 struct pci_bits {
515 unsigned int reg; /* PCI config register to read */
516 unsigned int width; /* 1 (8 bit), 2 (16 bit), 4 (32 bit) */
517 unsigned long mask;
518 unsigned long val;
519 };
520
521 extern void ata_pci_host_stop (struct ata_host_set *host_set);
522 extern struct ata_probe_ent *
523 ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int portmask);
524 extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);
525
526 #endif /* CONFIG_PCI */
527
528
529 static inline int
530 ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
531 {
532 if (sg == &qc->pad_sgent)
533 return 1;
534 if (qc->pad_len)
535 return 0;
536 if (((sg - qc->__sg) + 1) == qc->n_elem)
537 return 1;
538 return 0;
539 }
540
541 static inline struct scatterlist *
542 ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
543 {
544 if (sg == &qc->pad_sgent)
545 return NULL;
546 if (++sg - qc->__sg < qc->n_elem)
547 return sg;
548 return qc->pad_len ? &qc->pad_sgent : NULL;
549 }
550
551 #define ata_for_each_sg(sg, qc) \
552 for (sg = qc->__sg; sg; sg = ata_qc_next_sg(sg, qc))
553
554 static inline unsigned int ata_tag_valid(unsigned int tag)
555 {
556 return (tag < ATA_MAX_QUEUE) ? 1 : 0;
557 }
558
559 static inline unsigned int ata_dev_present(const struct ata_device *dev)
560 {
561 return ((dev->class == ATA_DEV_ATA) ||
562 (dev->class == ATA_DEV_ATAPI));
563 }
564
565 static inline u8 ata_chk_status(struct ata_port *ap)
566 {
567 return ap->ops->check_status(ap);
568 }
569
570
571 /**
572 * ata_pause - Flush writes and pause 400 nanoseconds.
573 * @ap: Port to wait for.
574 *
575 * LOCKING:
576 * Inherited from caller.
577 */
578
579 static inline void ata_pause(struct ata_port *ap)
580 {
581 ata_altstatus(ap);
582 ndelay(400);
583 }
584
585
586 /**
587 * ata_busy_wait - Wait for a port status register
588 * @ap: Port to wait for.
589 *
590 * Waits up to max*10 microseconds for the selected bits in the port's
591 * status register to be cleared.
592 * Returns final value of status register.
593 *
594 * LOCKING:
595 * Inherited from caller.
596 */
597
598 static inline u8 ata_busy_wait(struct ata_port *ap, unsigned int bits,
599 unsigned int max)
600 {
601 u8 status;
602
603 do {
604 udelay(10);
605 status = ata_chk_status(ap);
606 max--;
607 } while ((status & bits) && (max > 0));
608
609 return status;
610 }
611
612
613 /**
614 * ata_wait_idle - Wait for a port to be idle.
615 * @ap: Port to wait for.
616 *
617 * Waits up to 10ms for port's BUSY and DRQ signals to clear.
618 * Returns final value of status register.
619 *
620 * LOCKING:
621 * Inherited from caller.
622 */
623
624 static inline u8 ata_wait_idle(struct ata_port *ap)
625 {
626 u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
627
628 if (status & (ATA_BUSY | ATA_DRQ)) {
629 unsigned long l = ap->ioaddr.status_addr;
630 printk(KERN_WARNING
631 "ATA: abnormal status 0x%X on port 0x%lX\n",
632 status, l);
633 }
634
635 return status;
636 }
637
638 static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
639 {
640 qc->tf.ctl |= ATA_NIEN;
641 }
642
643 static inline struct ata_queued_cmd *ata_qc_from_tag (struct ata_port *ap,
644 unsigned int tag)
645 {
646 if (likely(ata_tag_valid(tag)))
647 return &ap->qcmd[tag];
648 return NULL;
649 }
650
651 static inline void ata_tf_init(struct ata_port *ap, struct ata_taskfile *tf, unsigned int device)
652 {
653 memset(tf, 0, sizeof(*tf));
654
655 tf->ctl = ap->ctl;
656 if (device == 0)
657 tf->device = ATA_DEVICE_OBS;
658 else
659 tf->device = ATA_DEVICE_OBS | ATA_DEV1;
660 }
661
662
663 /**
664 * ata_irq_on - Enable interrupts on a port.
665 * @ap: Port on which interrupts are enabled.
666 *
667 * Enable interrupts on a legacy IDE device using MMIO or PIO,
668 * wait for idle, clear any pending interrupts.
669 *
670 * LOCKING:
671 * Inherited from caller.
672 */
673
674 static inline u8 ata_irq_on(struct ata_port *ap)
675 {
676 struct ata_ioports *ioaddr = &ap->ioaddr;
677 u8 tmp;
678
679 ap->ctl &= ~ATA_NIEN;
680 ap->last_ctl = ap->ctl;
681
682 if (ap->flags & ATA_FLAG_MMIO)
683 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
684 else
685 outb(ap->ctl, ioaddr->ctl_addr);
686 tmp = ata_wait_idle(ap);
687
688 ap->ops->irq_clear(ap);
689
690 return tmp;
691 }
692
693
694 /**
695 * ata_irq_ack - Acknowledge a device interrupt.
696 * @ap: Port on which interrupts are enabled.
697 *
698 * Wait up to 10 ms for legacy IDE device to become idle (BUSY
699 * or BUSY+DRQ clear). Obtain dma status and port status from
700 * device. Clear the interrupt. Return port status.
701 *
702 * LOCKING:
703 */
704
705 static inline u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
706 {
707 unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
708 u8 host_stat, post_stat, status;
709
710 status = ata_busy_wait(ap, bits, 1000);
711 if (status & bits)
712 DPRINTK("abnormal status 0x%X\n", status);
713
714 /* get controller status; clear intr, err bits */
715 if (ap->flags & ATA_FLAG_MMIO) {
716 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
717 host_stat = readb(mmio + ATA_DMA_STATUS);
718 writeb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
719 mmio + ATA_DMA_STATUS);
720
721 post_stat = readb(mmio + ATA_DMA_STATUS);
722 } else {
723 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
724 outb(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
725 ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
726
727 post_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
728 }
729
730 VPRINTK("irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
731 host_stat, post_stat, status);
732
733 return status;
734 }
735
736 static inline u32 scr_read(struct ata_port *ap, unsigned int reg)
737 {
738 return ap->ops->scr_read(ap, reg);
739 }
740
741 static inline void scr_write(struct ata_port *ap, unsigned int reg, u32 val)
742 {
743 ap->ops->scr_write(ap, reg, val);
744 }
745
746 static inline void scr_write_flush(struct ata_port *ap, unsigned int reg,
747 u32 val)
748 {
749 ap->ops->scr_write(ap, reg, val);
750 (void) ap->ops->scr_read(ap, reg);
751 }
752
753 static inline unsigned int sata_dev_present(struct ata_port *ap)
754 {
755 return ((scr_read(ap, SCR_STATUS) & 0xf) == 0x3) ? 1 : 0;
756 }
757
758 static inline int ata_try_flush_cache(const struct ata_device *dev)
759 {
760 return ata_id_wcache_enabled(dev->id) ||
761 ata_id_has_flush(dev->id) ||
762 ata_id_has_flush_ext(dev->id);
763 }
764
765 static inline unsigned int ac_err_mask(u8 status)
766 {
767 if (status & ATA_BUSY)
768 return AC_ERR_ATA_BUS;
769 if (status & (ATA_ERR | ATA_DF))
770 return AC_ERR_DEV;
771 return 0;
772 }
773
774 static inline unsigned int __ac_err_mask(u8 status)
775 {
776 unsigned int mask = ac_err_mask(status);
777 if (mask == 0)
778 return AC_ERR_OTHER;
779 return mask;
780 }
781
782 static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev)
783 {
784 ap->pad_dma = 0;
785 ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ,
786 &ap->pad_dma, GFP_KERNEL);
787 return (ap->pad == NULL) ? -ENOMEM : 0;
788 }
789
790 static inline void ata_pad_free(struct ata_port *ap, struct device *dev)
791 {
792 dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
793 }
794
795 #endif /* __LINUX_LIBATA_H__ */
linux kernel for loongson