1 /*
2  * Adaptec AIC7xxx device driver for Linux.
3  *
4  * Copyright (c) 1994 John Aycock
5  *   The University of Calgary Department of Computer Science.
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; see the file COPYING.  If not, write to
19  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
20  *
21  * Copyright (c) 2000-2003 Adaptec Inc.
22  * All rights reserved.
23  *
24  * Redistribution and use in source and binary forms, with or without
25  * modification, are permitted provided that the following conditions
26  * are met:
27  * 1. Redistributions of source code must retain the above copyright
28  *    notice, this list of conditions, and the following disclaimer,
29  *    without modification.
30  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
31  *    substantially similar to the "NO WARRANTY" disclaimer below
32  *    ("Disclaimer") and any redistribution must be conditioned upon
33  *    including a substantially similar Disclaimer requirement for further
34  *    binary redistribution.
35  * 3. Neither the names of the above-listed copyright holders nor the names
36  *    of any contributors may be used to endorse or promote products derived
37  *    from this software without specific prior written permission.
38  *
39  * Alternatively, this software may be distributed under the terms of the
40  * GNU General Public License ("GPL") version 2 as published by the Free
41  * Software Foundation.
42  *
43  * NO WARRANTY
44  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
45  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
46  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
47  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
48  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
52  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
53  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
54  * POSSIBILITY OF SUCH DAMAGES.
55  *
56  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.h#151 $
57  *
58  */
59 #ifndef _AIC7XXX_LINUX_H_
60 #define _AIC7XXX_LINUX_H_
61 
62 #include <linux/types.h>
63 #include <linux/blkdev.h>
64 #include <linux/delay.h>
65 #include <linux/ioport.h>
66 #include <linux/pci.h>
67 #include <linux/interrupt.h>
68 #include <linux/module.h>
69 #include <linux/slab.h>
70 #include <asm/byteorder.h>
71 #include <asm/io.h>
72 
73 #include <scsi/scsi.h>
74 #include <scsi/scsi_cmnd.h>
75 #include <scsi/scsi_eh.h>
76 #include <scsi/scsi_device.h>
77 #include <scsi/scsi_host.h>
78 #include <scsi/scsi_tcq.h>
79 #include <scsi/scsi_transport.h>
80 #include <scsi/scsi_transport_spi.h>
81 
82 /* Core SCSI definitions */
83 #define AIC_LIB_PREFIX ahc
84 
85 #include "cam.h"
86 #include "queue.h"
87 #include "scsi_message.h"
88 #include "aiclib.h"
89 
90 /*********************************** Debugging ********************************/
91 #ifdef CONFIG_AIC7XXX_DEBUG_ENABLE
92 #ifdef CONFIG_AIC7XXX_DEBUG_MASK
93 #define AHC_DEBUG 1
94 #define AHC_DEBUG_OPTS CONFIG_AIC7XXX_DEBUG_MASK
95 #else
96 /*
97  * Compile in debugging code, but do not enable any printfs.
98  */
99 #define AHC_DEBUG 1
100 #endif
101 /* No debugging code. */
102 #endif
103 
104 /************************* Forward Declarations *******************************/
105 struct ahc_softc;
106 typedef struct pci_dev *ahc_dev_softc_t;
107 typedef struct scsi_cmnd      *ahc_io_ctx_t;
108 
109 /******************************* Byte Order ***********************************/
110 #define ahc_htobe16(x)	cpu_to_be16(x)
111 #define ahc_htobe32(x)	cpu_to_be32(x)
112 #define ahc_htobe64(x)	cpu_to_be64(x)
113 #define ahc_htole16(x)	cpu_to_le16(x)
114 #define ahc_htole32(x)	cpu_to_le32(x)
115 #define ahc_htole64(x)	cpu_to_le64(x)
116 
117 #define ahc_be16toh(x)	be16_to_cpu(x)
118 #define ahc_be32toh(x)	be32_to_cpu(x)
119 #define ahc_be64toh(x)	be64_to_cpu(x)
120 #define ahc_le16toh(x)	le16_to_cpu(x)
121 #define ahc_le32toh(x)	le32_to_cpu(x)
122 #define ahc_le64toh(x)	le64_to_cpu(x)
123 
124 /************************* Configuration Data *********************************/
125 extern u_int aic7xxx_no_probe;
126 extern u_int aic7xxx_allow_memio;
127 extern struct scsi_host_template aic7xxx_driver_template;
128 
129 /***************************** Bus Space/DMA **********************************/
130 
131 typedef uint32_t bus_size_t;
132 
133 typedef enum {
134 	BUS_SPACE_MEMIO,
135 	BUS_SPACE_PIO
136 } bus_space_tag_t;
137 
138 typedef union {
139 	u_long		  ioport;
140 	volatile uint8_t __iomem *maddr;
141 } bus_space_handle_t;
142 
143 typedef struct bus_dma_segment
144 {
145 	dma_addr_t	ds_addr;
146 	bus_size_t	ds_len;
147 } bus_dma_segment_t;
148 
149 struct ahc_linux_dma_tag
150 {
151 	bus_size_t	alignment;
152 	bus_size_t	boundary;
153 	bus_size_t	maxsize;
154 };
155 typedef struct ahc_linux_dma_tag* bus_dma_tag_t;
156 
157 typedef dma_addr_t bus_dmamap_t;
158 
159 typedef int bus_dma_filter_t(void*, dma_addr_t);
160 typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);
161 
162 #define BUS_DMA_WAITOK		0x0
163 #define BUS_DMA_NOWAIT		0x1
164 #define BUS_DMA_ALLOCNOW	0x2
165 #define BUS_DMA_LOAD_SEGS	0x4	/*
166 					 * Argument is an S/G list not
167 					 * a single buffer.
168 					 */
169 
170 #define BUS_SPACE_MAXADDR	0xFFFFFFFF
171 #define BUS_SPACE_MAXADDR_32BIT	0xFFFFFFFF
172 #define BUS_SPACE_MAXSIZE_32BIT	0xFFFFFFFF
173 
174 int	ahc_dma_tag_create(struct ahc_softc *, bus_dma_tag_t /*parent*/,
175 			   bus_size_t /*alignment*/, bus_size_t /*boundary*/,
176 			   dma_addr_t /*lowaddr*/, dma_addr_t /*highaddr*/,
177 			   bus_dma_filter_t*/*filter*/, void */*filterarg*/,
178 			   bus_size_t /*maxsize*/, int /*nsegments*/,
179 			   bus_size_t /*maxsegsz*/, int /*flags*/,
180 			   bus_dma_tag_t */*dma_tagp*/);
181 
182 void	ahc_dma_tag_destroy(struct ahc_softc *, bus_dma_tag_t /*tag*/);
183 
184 int	ahc_dmamem_alloc(struct ahc_softc *, bus_dma_tag_t /*dmat*/,
185 			 void** /*vaddr*/, int /*flags*/,
186 			 bus_dmamap_t* /*mapp*/);
187 
188 void	ahc_dmamem_free(struct ahc_softc *, bus_dma_tag_t /*dmat*/,
189 			void* /*vaddr*/, bus_dmamap_t /*map*/);
190 
191 void	ahc_dmamap_destroy(struct ahc_softc *, bus_dma_tag_t /*tag*/,
192 			   bus_dmamap_t /*map*/);
193 
194 int	ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t /*dmat*/,
195 			bus_dmamap_t /*map*/, void * /*buf*/,
196 			bus_size_t /*buflen*/, bus_dmamap_callback_t *,
197 			void */*callback_arg*/, int /*flags*/);
198 
199 int	ahc_dmamap_unload(struct ahc_softc *, bus_dma_tag_t, bus_dmamap_t);
200 
201 /*
202  * Operations performed by ahc_dmamap_sync().
203  */
204 #define BUS_DMASYNC_PREREAD	0x01	/* pre-read synchronization */
205 #define BUS_DMASYNC_POSTREAD	0x02	/* post-read synchronization */
206 #define BUS_DMASYNC_PREWRITE	0x04	/* pre-write synchronization */
207 #define BUS_DMASYNC_POSTWRITE	0x08	/* post-write synchronization */
208 
209 /*
210  * XXX
211  * ahc_dmamap_sync is only used on buffers allocated with
212  * the pci_alloc_consistent() API.  Although I'm not sure how
213  * this works on architectures with a write buffer, Linux does
214  * not have an API to sync "coherent" memory.  Perhaps we need
215  * to do an mb()?
216  */
217 #define ahc_dmamap_sync(ahc, dma_tag, dmamap, offset, len, op)
218 
219 /********************************** Includes **********************************/
220 #ifdef CONFIG_AIC7XXX_REG_PRETTY_PRINT
221 #define AIC_DEBUG_REGISTERS 1
222 #else
223 #define AIC_DEBUG_REGISTERS 0
224 #endif
225 #include "aic7xxx.h"
226 
227 /***************************** Timer Facilities *******************************/
228 static inline void
229 ahc_scb_timer_reset(struct scb *scb, u_int usec)
230 {
231 }
232 
233 /***************************** SMP support ************************************/
234 #include <linux/spinlock.h>
235 
236 #define AIC7XXX_DRIVER_VERSION "7.0"
237 
238 /*************************** Device Data Structures ***************************/
239 /*
240  * A per probed device structure used to deal with some error recovery
241  * scenarios that the Linux mid-layer code just doesn't know how to
242  * handle.  The structure allocated for a device only becomes persistent
243  * after a successfully completed inquiry command to the target when
244  * that inquiry data indicates a lun is present.
245  */
246 typedef enum {
247 	AHC_DEV_FREEZE_TIL_EMPTY = 0x02, /* Freeze queue until active == 0 */
248 	AHC_DEV_Q_BASIC		 = 0x10, /* Allow basic device queuing */
249 	AHC_DEV_Q_TAGGED	 = 0x20, /* Allow full SCSI2 command queueing */
250 	AHC_DEV_PERIODIC_OTAG	 = 0x40, /* Send OTAG to prevent starvation */
251 } ahc_linux_dev_flags;
252 
253 struct ahc_linux_device {
254 	/*
255 	 * The number of transactions currently
256 	 * queued to the device.
257 	 */
258 	int			active;
259 
260 	/*
261 	 * The currently allowed number of
262 	 * transactions that can be queued to
263 	 * the device.  Must be signed for
264 	 * conversion from tagged to untagged
265 	 * mode where the device may have more
266 	 * than one outstanding active transaction.
267 	 */
268 	int			openings;
269 
270 	/*
271 	 * A positive count indicates that this
272 	 * device's queue is halted.
273 	 */
274 	u_int			qfrozen;
275 
276 	/*
277 	 * Cumulative command counter.
278 	 */
279 	u_long			commands_issued;
280 
281 	/*
282 	 * The number of tagged transactions when
283 	 * running at our current opening level
284 	 * that have been successfully received by
285 	 * this device since the last QUEUE FULL.
286 	 */
287 	u_int			tag_success_count;
288 #define AHC_TAG_SUCCESS_INTERVAL 50
289 
290 	ahc_linux_dev_flags	flags;
291 
292 	/*
293 	 * The high limit for the tags variable.
294 	 */
295 	u_int			maxtags;
296 
297 	/*
298 	 * The computed number of tags outstanding
299 	 * at the time of the last QUEUE FULL event.
300 	 */
301 	u_int			tags_on_last_queuefull;
302 
303 	/*
304 	 * How many times we have seen a queue full
305 	 * with the same number of tags.  This is used
306 	 * to stop our adaptive queue depth algorithm
307 	 * on devices with a fixed number of tags.
308 	 */
309 	u_int			last_queuefull_same_count;
310 #define AHC_LOCK_TAGS_COUNT 50
311 
312 	/*
313 	 * How many transactions have been queued
314 	 * without the device going idle.  We use
315 	 * this statistic to determine when to issue
316 	 * an ordered tag to prevent transaction
317 	 * starvation.  This statistic is only updated
318 	 * if the AHC_DEV_PERIODIC_OTAG flag is set
319 	 * on this device.
320 	 */
321 	u_int			commands_since_idle_or_otag;
322 #define AHC_OTAG_THRESH	500
323 };
324 
325 /********************* Definitions Required by the Core ***********************/
326 /*
327  * Number of SG segments we require.  So long as the S/G segments for
328  * a particular transaction are allocated in a physically contiguous
329  * manner and are allocated below 4GB, the number of S/G segments is
330  * unrestricted.
331  */
332 #define	AHC_NSEG 128
333 
334 /*
335  * Per-SCB OSM storage.
336  */
337 struct scb_platform_data {
338 	struct ahc_linux_device	*dev;
339 	dma_addr_t		 buf_busaddr;
340 	uint32_t		 xfer_len;
341 	uint32_t		 sense_resid;	/* Auto-Sense residual */
342 };
343 
344 /*
345  * Define a structure used for each host adapter.  All members are
346  * aligned on a boundary >= the size of the member to honor the
347  * alignment restrictions of the various platforms supported by
348  * this driver.
349  */
350 struct ahc_platform_data {
351 	/*
352 	 * Fields accessed from interrupt context.
353 	 */
354 	struct scsi_target *starget[AHC_NUM_TARGETS];
355 
356 	spinlock_t		 spin_lock;
357 	u_int			 qfrozen;
358 	struct completion	*eh_done;
359 	struct Scsi_Host        *host;		/* pointer to scsi host */
360 #define AHC_LINUX_NOIRQ	((uint32_t)~0)
361 	uint32_t		 irq;		/* IRQ for this adapter */
362 	uint32_t		 bios_address;
363 	resource_size_t 	 mem_busaddr;	/* Mem Base Addr */
364 };
365 
366 void ahc_delay(long);
367 
368 
369 /***************************** Low Level I/O **********************************/
370 uint8_t ahc_inb(struct ahc_softc * ahc, long port);
371 void ahc_outb(struct ahc_softc * ahc, long port, uint8_t val);
372 void ahc_outsb(struct ahc_softc * ahc, long port,
373 	       uint8_t *, int count);
374 void ahc_insb(struct ahc_softc * ahc, long port,
375 	       uint8_t *, int count);
376 
377 /**************************** Initialization **********************************/
378 int		ahc_linux_register_host(struct ahc_softc *,
379 					struct scsi_host_template *);
380 
381 /******************************** Locking *************************************/
382 /* Lock protecting internal data structures */
383 
384 static inline void
385 ahc_lockinit(struct ahc_softc *ahc)
386 {
387 	spin_lock_init(&ahc->platform_data->spin_lock);
388 }
389 
390 static inline void
391 ahc_lock(struct ahc_softc *ahc, unsigned long *flags)
392 {
393 	spin_lock_irqsave(&ahc->platform_data->spin_lock, *flags);
394 }
395 
396 static inline void
397 ahc_unlock(struct ahc_softc *ahc, unsigned long *flags)
398 {
399 	spin_unlock_irqrestore(&ahc->platform_data->spin_lock, *flags);
400 }
401 
402 /******************************* PCI Definitions ******************************/
403 /*
404  * PCIM_xxx: mask to locate subfield in register
405  * PCIR_xxx: config register offset
406  * PCIC_xxx: device class
407  * PCIS_xxx: device subclass
408  * PCIP_xxx: device programming interface
409  * PCIV_xxx: PCI vendor ID (only required to fixup ancient devices)
410  * PCID_xxx: device ID
411  */
412 #define PCIR_DEVVENDOR		0x00
413 #define PCIR_VENDOR		0x00
414 #define PCIR_DEVICE		0x02
415 #define PCIR_COMMAND		0x04
416 #define PCIM_CMD_PORTEN		0x0001
417 #define PCIM_CMD_MEMEN		0x0002
418 #define PCIM_CMD_BUSMASTEREN	0x0004
419 #define PCIM_CMD_MWRICEN	0x0010
420 #define PCIM_CMD_PERRESPEN	0x0040
421 #define	PCIM_CMD_SERRESPEN	0x0100
422 #define PCIR_STATUS		0x06
423 #define PCIR_REVID		0x08
424 #define PCIR_PROGIF		0x09
425 #define PCIR_SUBCLASS		0x0a
426 #define PCIR_CLASS		0x0b
427 #define PCIR_CACHELNSZ		0x0c
428 #define PCIR_LATTIMER		0x0d
429 #define PCIR_HEADERTYPE		0x0e
430 #define PCIM_MFDEV		0x80
431 #define PCIR_BIST		0x0f
432 #define PCIR_CAP_PTR		0x34
433 
434 /* config registers for header type 0 devices */
435 #define PCIR_MAPS	0x10
436 #define PCIR_SUBVEND_0	0x2c
437 #define PCIR_SUBDEV_0	0x2e
438 
439 typedef enum
440 {
441 	AHC_POWER_STATE_D0,
442 	AHC_POWER_STATE_D1,
443 	AHC_POWER_STATE_D2,
444 	AHC_POWER_STATE_D3
445 } ahc_power_state;
446 
447 /**************************** VL/EISA Routines ********************************/
448 #ifdef CONFIG_EISA
449 int			 ahc_linux_eisa_init(void);
450 void			 ahc_linux_eisa_exit(void);
451 int			 aic7770_map_registers(struct ahc_softc *ahc,
452 					       u_int port);
453 int			 aic7770_map_int(struct ahc_softc *ahc, u_int irq);
454 #else
455 static inline int	ahc_linux_eisa_init(void) {
456 	return -ENODEV;
457 }
458 static inline void	ahc_linux_eisa_exit(void) {
459 }
460 #endif
461 
462 /******************************* PCI Routines *********************************/
463 #ifdef CONFIG_PCI
464 int			 ahc_linux_pci_init(void);
465 void			 ahc_linux_pci_exit(void);
466 int			 ahc_pci_map_registers(struct ahc_softc *ahc);
467 int			 ahc_pci_map_int(struct ahc_softc *ahc);
468 
469 uint32_t		 ahc_pci_read_config(ahc_dev_softc_t pci,
470 					     int reg, int width);
471 
472 void			 ahc_pci_write_config(ahc_dev_softc_t pci,
473 					      int reg, uint32_t value,
474 					      int width);
475 
476 static inline int ahc_get_pci_function(ahc_dev_softc_t);
477 static inline int
478 ahc_get_pci_function(ahc_dev_softc_t pci)
479 {
480 	return (PCI_FUNC(pci->devfn));
481 }
482 
483 static inline int ahc_get_pci_slot(ahc_dev_softc_t);
484 static inline int
485 ahc_get_pci_slot(ahc_dev_softc_t pci)
486 {
487 	return (PCI_SLOT(pci->devfn));
488 }
489 
490 static inline int ahc_get_pci_bus(ahc_dev_softc_t);
491 static inline int
492 ahc_get_pci_bus(ahc_dev_softc_t pci)
493 {
494 	return (pci->bus->number);
495 }
496 #else
497 static inline int ahc_linux_pci_init(void) {
498 	return 0;
499 }
500 static inline void ahc_linux_pci_exit(void) {
501 }
502 #endif
503 
504 static inline void ahc_flush_device_writes(struct ahc_softc *);
505 static inline void
506 ahc_flush_device_writes(struct ahc_softc *ahc)
507 {
508 	/* XXX Is this sufficient for all architectures??? */
509 	ahc_inb(ahc, INTSTAT);
510 }
511 
512 /**************************** Proc FS Support *********************************/
513 int	ahc_proc_write_seeprom(struct Scsi_Host *, char *, int);
514 int	ahc_linux_show_info(struct seq_file *, struct Scsi_Host *);
515 
516 /*************************** Domain Validation ********************************/
517 /*********************** Transaction Access Wrappers *************************/
518 static inline void ahc_cmd_set_transaction_status(struct scsi_cmnd *, uint32_t);
519 static inline void ahc_set_transaction_status(struct scb *, uint32_t);
520 static inline void ahc_cmd_set_scsi_status(struct scsi_cmnd *, uint32_t);
521 static inline void ahc_set_scsi_status(struct scb *, uint32_t);
522 static inline uint32_t ahc_cmd_get_transaction_status(struct scsi_cmnd *cmd);
523 static inline uint32_t ahc_get_transaction_status(struct scb *);
524 static inline uint32_t ahc_cmd_get_scsi_status(struct scsi_cmnd *cmd);
525 static inline uint32_t ahc_get_scsi_status(struct scb *);
526 static inline void ahc_set_transaction_tag(struct scb *, int, u_int);
527 static inline u_long ahc_get_transfer_length(struct scb *);
528 static inline int ahc_get_transfer_dir(struct scb *);
529 static inline void ahc_set_residual(struct scb *, u_long);
530 static inline void ahc_set_sense_residual(struct scb *scb, u_long resid);
531 static inline u_long ahc_get_residual(struct scb *);
532 static inline u_long ahc_get_sense_residual(struct scb *);
533 static inline int ahc_perform_autosense(struct scb *);
534 static inline uint32_t ahc_get_sense_bufsize(struct ahc_softc *,
535 					       struct scb *);
536 static inline void ahc_notify_xfer_settings_change(struct ahc_softc *,
537 						     struct ahc_devinfo *);
538 static inline void ahc_platform_scb_free(struct ahc_softc *ahc,
539 					   struct scb *scb);
540 static inline void ahc_freeze_scb(struct scb *scb);
541 
542 static inline
543 void ahc_cmd_set_transaction_status(struct scsi_cmnd *cmd, uint32_t status)
544 {
545 	cmd->result &= ~(CAM_STATUS_MASK << 16);
546 	cmd->result |= status << 16;
547 }
548 
549 static inline
550 void ahc_set_transaction_status(struct scb *scb, uint32_t status)
551 {
552 	ahc_cmd_set_transaction_status(scb->io_ctx,status);
553 }
554 
555 static inline
556 void ahc_cmd_set_scsi_status(struct scsi_cmnd *cmd, uint32_t status)
557 {
558 	cmd->result &= ~0xFFFF;
559 	cmd->result |= status;
560 }
561 
562 static inline
563 void ahc_set_scsi_status(struct scb *scb, uint32_t status)
564 {
565 	ahc_cmd_set_scsi_status(scb->io_ctx, status);
566 }
567 
568 static inline
569 uint32_t ahc_cmd_get_transaction_status(struct scsi_cmnd *cmd)
570 {
571 	return ((cmd->result >> 16) & CAM_STATUS_MASK);
572 }
573 
574 static inline
575 uint32_t ahc_get_transaction_status(struct scb *scb)
576 {
577 	return (ahc_cmd_get_transaction_status(scb->io_ctx));
578 }
579 
580 static inline
581 uint32_t ahc_cmd_get_scsi_status(struct scsi_cmnd *cmd)
582 {
583 	return (cmd->result & 0xFFFF);
584 }
585 
586 static inline
587 uint32_t ahc_get_scsi_status(struct scb *scb)
588 {
589 	return (ahc_cmd_get_scsi_status(scb->io_ctx));
590 }
591 
592 static inline
593 void ahc_set_transaction_tag(struct scb *scb, int enabled, u_int type)
594 {
595 	/*
596 	 * Nothing to do for linux as the incoming transaction
597 	 * has no concept of tag/non tagged, etc.
598 	 */
599 }
600 
601 static inline
602 u_long ahc_get_transfer_length(struct scb *scb)
603 {
604 	return (scb->platform_data->xfer_len);
605 }
606 
607 static inline
608 int ahc_get_transfer_dir(struct scb *scb)
609 {
610 	return (scb->io_ctx->sc_data_direction);
611 }
612 
613 static inline
614 void ahc_set_residual(struct scb *scb, u_long resid)
615 {
616 	scsi_set_resid(scb->io_ctx, resid);
617 }
618 
619 static inline
620 void ahc_set_sense_residual(struct scb *scb, u_long resid)
621 {
622 	scb->platform_data->sense_resid = resid;
623 }
624 
625 static inline
626 u_long ahc_get_residual(struct scb *scb)
627 {
628 	return scsi_get_resid(scb->io_ctx);
629 }
630 
631 static inline
632 u_long ahc_get_sense_residual(struct scb *scb)
633 {
634 	return (scb->platform_data->sense_resid);
635 }
636 
637 static inline
638 int ahc_perform_autosense(struct scb *scb)
639 {
640 	/*
641 	 * We always perform autosense in Linux.
642 	 * On other platforms this is set on a
643 	 * per-transaction basis.
644 	 */
645 	return (1);
646 }
647 
648 static inline uint32_t
649 ahc_get_sense_bufsize(struct ahc_softc *ahc, struct scb *scb)
650 {
651 	return (sizeof(struct scsi_sense_data));
652 }
653 
654 static inline void
655 ahc_notify_xfer_settings_change(struct ahc_softc *ahc,
656 				struct ahc_devinfo *devinfo)
657 {
658 	/* Nothing to do here for linux */
659 }
660 
661 static inline void
662 ahc_platform_scb_free(struct ahc_softc *ahc, struct scb *scb)
663 {
664 }
665 
666 int	ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg);
667 void	ahc_platform_free(struct ahc_softc *ahc);
668 void	ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb);
669 
670 static inline void
671 ahc_freeze_scb(struct scb *scb)
672 {
673 	if ((scb->io_ctx->result & (CAM_DEV_QFRZN << 16)) == 0) {
674                 scb->io_ctx->result |= CAM_DEV_QFRZN << 16;
675                 scb->platform_data->dev->qfrozen++;
676         }
677 }
678 
679 void	ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
680 			      struct ahc_devinfo *devinfo, ahc_queue_alg);
681 int	ahc_platform_abort_scbs(struct ahc_softc *ahc, int target,
682 				char channel, int lun, u_int tag,
683 				role_t role, uint32_t status);
684 irqreturn_t
685 	ahc_linux_isr(int irq, void *dev_id);
686 void	ahc_platform_flushwork(struct ahc_softc *ahc);
687 void	ahc_done(struct ahc_softc*, struct scb*);
688 void	ahc_send_async(struct ahc_softc *, char channel,
689 		       u_int target, u_int lun, ac_code);
690 void	ahc_print_path(struct ahc_softc *, struct scb *);
691 
692 #ifdef CONFIG_PCI
693 #define AHC_PCI_CONFIG 1
694 #else
695 #define AHC_PCI_CONFIG 0
696 #endif
697 #define bootverbose aic7xxx_verbose
698 extern u_int aic7xxx_verbose;
699 #endif /* _AIC7XXX_LINUX_H_ */
700