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sched: s/sched_latency/sched_min_granularity
[usb.git] / drivers / scsi / 53c700.h
blobe06bdfeab420013f4655251623a3d6b6f5e56f9b
1 /* -*- mode: c; c-basic-offset: 8 -*- */
2
3 /* Driver for 53c700 and 53c700-66 chips from NCR and Symbios
4 *
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6 */
7
8 #ifndef _53C700_H
9 #define _53C700_H
10
11 #include <linux/interrupt.h>
12 #include <asm/io.h>
13
14 #include <scsi/scsi_device.h>
15 #include <scsi/scsi_cmnd.h>
16
17 /* Turn on for general debugging---too verbose for normal use */
18 #undef NCR_700_DEBUG
19 /* Debug the tag queues, checking hash queue allocation and deallocation
20 * and search for duplicate tags */
21 #undef NCR_700_TAG_DEBUG
22
23 #ifdef NCR_700_DEBUG
24 #define DEBUG(x) printk x
25 #define DDEBUG(prefix, sdev, fmt, a...) \
26 sdev_printk(prefix, sdev, fmt, ##a)
27 #define CDEBUG(prefix, scmd, fmt, a...) \
28 scmd_printk(prefix, scmd, fmt, ##a)
29 #else
30 #define DEBUG(x) do {} while (0)
31 #define DDEBUG(prefix, scmd, fmt, a...) do {} while (0)
32 #define CDEBUG(prefix, scmd, fmt, a...) do {} while (0)
33 #endif
34
35 /* The number of available command slots */
36 #define NCR_700_COMMAND_SLOTS_PER_HOST 64
37 /* The maximum number of Scatter Gathers we allow */
38 #define NCR_700_SG_SEGMENTS 32
39 /* The maximum number of luns (make this of the form 2^n) */
40 #define NCR_700_MAX_LUNS 32
41 #define NCR_700_LUN_MASK (NCR_700_MAX_LUNS - 1)
42 /* Maximum number of tags the driver ever allows per device */
43 #define NCR_700_MAX_TAGS 16
44 /* Tag depth the driver starts out with (can be altered in sysfs) */
45 #define NCR_700_DEFAULT_TAGS 4
46 /* This is the default number of commands per LUN in the untagged case.
47 * two is a good value because it means we can have one command active and
48 * one command fully prepared and waiting
49 */
50 #define NCR_700_CMD_PER_LUN 2
51 /* magic byte identifying an internally generated REQUEST_SENSE command */
52 #define NCR_700_INTERNAL_SENSE_MAGIC 0x42
53
54 struct NCR_700_Host_Parameters;
55
56 /* These are the externally used routines */
57 struct Scsi_Host *NCR_700_detect(struct scsi_host_template *,
58 struct NCR_700_Host_Parameters *, struct device *);
59 int NCR_700_release(struct Scsi_Host *host);
60 irqreturn_t NCR_700_intr(int, void *);
61
62
63 enum NCR_700_Host_State {
64 NCR_700_HOST_BUSY,
65 NCR_700_HOST_FREE,
66 };
67
68 struct NCR_700_SG_List {
69 /* The following is a script fragment to move the buffer onto the
70 * bus and then link the next fragment or return */
71 #define SCRIPT_MOVE_DATA_IN 0x09000000
72 #define SCRIPT_MOVE_DATA_OUT 0x08000000
73 __u32 ins;
74 __u32 pAddr;
75 #define SCRIPT_NOP 0x80000000
76 #define SCRIPT_RETURN 0x90080000
77 };
78
79 struct NCR_700_Device_Parameters {
80 /* space for creating a request sense command. Really, except
81 * for the annoying SCSI-2 requirement for LUN information in
82 * cmnd[1], this could be in static storage */
83 unsigned char cmnd[MAX_COMMAND_SIZE];
84 __u8 depth;
85 };
86
87
88 /* The SYNC negotiation sequence looks like:
89 *
90 * If DEV_NEGOTIATED_SYNC not set, tack and SDTR message on to the
91 * initial identify for the device and set DEV_BEGIN_SYNC_NEGOTATION
92 * If we get an SDTR reply, work out the SXFER parameters, squirrel
93 * them away here, clear DEV_BEGIN_SYNC_NEGOTIATION and set
94 * DEV_NEGOTIATED_SYNC. If we get a REJECT msg, squirrel
95 *
96 *
97 * 0:7 SXFER_REG negotiated value for this device
98 * 8:15 Current queue depth
99 * 16 negotiated SYNC flag
100 * 17 begin SYNC negotiation flag
101 * 18 device supports tag queueing */
102 #define NCR_700_DEV_NEGOTIATED_SYNC (1<<16)
103 #define NCR_700_DEV_BEGIN_SYNC_NEGOTIATION (1<<17)
104 #define NCR_700_DEV_PRINT_SYNC_NEGOTIATION (1<<19)
105
106 static inline char *NCR_700_get_sense_cmnd(struct scsi_device *SDp)
107 {
108 struct NCR_700_Device_Parameters *hostdata = SDp->hostdata;
109
110 return hostdata->cmnd;
111 }
112
113 static inline void
114 NCR_700_set_depth(struct scsi_device *SDp, __u8 depth)
115 {
116 struct NCR_700_Device_Parameters *hostdata = SDp->hostdata;
117
118 hostdata->depth = depth;
119 }
120 static inline __u8
121 NCR_700_get_depth(struct scsi_device *SDp)
122 {
123 struct NCR_700_Device_Parameters *hostdata = SDp->hostdata;
124
125 return hostdata->depth;
126 }
127 static inline int
128 NCR_700_is_flag_set(struct scsi_device *SDp, __u32 flag)
129 {
130 return (spi_flags(SDp->sdev_target) & flag) == flag;
131 }
132 static inline int
133 NCR_700_is_flag_clear(struct scsi_device *SDp, __u32 flag)
134 {
135 return (spi_flags(SDp->sdev_target) & flag) == 0;
136 }
137 static inline void
138 NCR_700_set_flag(struct scsi_device *SDp, __u32 flag)
139 {
140 spi_flags(SDp->sdev_target) |= flag;
141 }
142 static inline void
143 NCR_700_clear_flag(struct scsi_device *SDp, __u32 flag)
144 {
145 spi_flags(SDp->sdev_target) &= ~flag;
146 }
147
148 enum NCR_700_tag_neg_state {
149 NCR_700_START_TAG_NEGOTIATION = 0,
150 NCR_700_DURING_TAG_NEGOTIATION = 1,
151 NCR_700_FINISHED_TAG_NEGOTIATION = 2,
152 };
153
154 static inline enum NCR_700_tag_neg_state
155 NCR_700_get_tag_neg_state(struct scsi_device *SDp)
156 {
157 return (enum NCR_700_tag_neg_state)((spi_flags(SDp->sdev_target)>>20) & 0x3);
158 }
159
160 static inline void
161 NCR_700_set_tag_neg_state(struct scsi_device *SDp,
162 enum NCR_700_tag_neg_state state)
163 {
164 /* clear the slot */
165 spi_flags(SDp->sdev_target) &= ~(0x3 << 20);
166 spi_flags(SDp->sdev_target) |= ((__u32)state) << 20;
167 }
168
169 struct NCR_700_command_slot {
170 struct NCR_700_SG_List SG[NCR_700_SG_SEGMENTS+1];
171 struct NCR_700_SG_List *pSG;
172 #define NCR_700_SLOT_MASK 0xFC
173 #define NCR_700_SLOT_MAGIC 0xb8
174 #define NCR_700_SLOT_FREE (0|NCR_700_SLOT_MAGIC) /* slot may be used */
175 #define NCR_700_SLOT_BUSY (1|NCR_700_SLOT_MAGIC) /* slot has command active on HA */
176 #define NCR_700_SLOT_QUEUED (2|NCR_700_SLOT_MAGIC) /* slot has command to be made active on HA */
177 __u8 state;
178 #define NCR_700_FLAG_AUTOSENSE 0x01
179 __u8 flags;
180 __u8 pad1[2]; /* Needed for m68k where min alignment is 2 bytes */
181 int tag;
182 __u32 resume_offset;
183 struct scsi_cmnd *cmnd;
184 /* The pci_mapped address of the actual command in cmnd */
185 dma_addr_t pCmd;
186 __u32 temp;
187 /* if this command is a pci_single mapping, holds the dma address
188 * for later unmapping in the done routine */
189 dma_addr_t dma_handle;
190 /* historical remnant, now used to link free commands */
191 struct NCR_700_command_slot *ITL_forw;
192 };
193
194 struct NCR_700_Host_Parameters {
195 /* These must be filled in by the calling driver */
196 int clock; /* board clock speed in MHz */
197 void __iomem *base; /* the base for the port (copied to host) */
198 struct device *dev;
199 __u32 dmode_extra; /* adjustable bus settings */
200 __u32 dcntl_extra; /* adjustable bus settings */
201 __u32 ctest7_extra; /* adjustable bus settings */
202 __u32 differential:1; /* if we are differential */
203 #ifdef CONFIG_53C700_LE_ON_BE
204 /* This option is for HP only. Set it if your chip is wired for
205 * little endian on this platform (which is big endian) */
206 __u32 force_le_on_be:1;
207 #endif
208 __u32 chip710:1; /* set if really a 710 not 700 */
209 __u32 burst_length:4; /* set to 0 to disable 710 bursting */
210
211 /* NOTHING BELOW HERE NEEDS ALTERING */
212 __u32 fast:1; /* if we can alter the SCSI bus clock
213 speed (so can negiotiate sync) */
214 int sync_clock; /* The speed of the SYNC core */
215
216 __u32 *script; /* pointer to script location */
217 __u32 pScript; /* physical mem addr of script */
218
219 enum NCR_700_Host_State state; /* protected by state lock */
220 struct scsi_cmnd *cmd;
221 /* Note: pScript contains the single consistent block of
222 * memory. All the msgin, msgout and status are allocated in
223 * this memory too (at separate cache lines). TOTAL_MEM_SIZE
224 * represents the total size of this area */
225 #define MSG_ARRAY_SIZE 8
226 #define MSGOUT_OFFSET (L1_CACHE_ALIGN(sizeof(SCRIPT)))
227 __u8 *msgout;
228 #define MSGIN_OFFSET (MSGOUT_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
229 __u8 *msgin;
230 #define STATUS_OFFSET (MSGIN_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
231 __u8 *status;
232 #define SLOTS_OFFSET (STATUS_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
233 struct NCR_700_command_slot *slots;
234 #define TOTAL_MEM_SIZE (SLOTS_OFFSET + L1_CACHE_ALIGN(sizeof(struct NCR_700_command_slot) * NCR_700_COMMAND_SLOTS_PER_HOST))
235 int saved_slot_position;
236 int command_slot_count; /* protected by state lock */
237 __u8 tag_negotiated;
238 __u8 rev;
239 __u8 reselection_id;
240 __u8 min_period;
241
242 /* Free list, singly linked by ITL_forw elements */
243 struct NCR_700_command_slot *free_list;
244 /* Completion for waited for ops, like reset, abort or
245 * device reset.
246 *
247 * NOTE: relies on single threading in the error handler to
248 * have only one outstanding at once */
249 struct completion *eh_complete;
250 };
251
252 /*
253 * 53C700 Register Interface - the offset from the Selected base
254 * I/O address */
255 #ifdef CONFIG_53C700_LE_ON_BE
256 #define bE (hostdata->force_le_on_be ? 0 : 3)
257 #define bSWAP (hostdata->force_le_on_be)
258 #define bEBus (!hostdata->force_le_on_be)
259 #elif defined(__BIG_ENDIAN)
260 #define bE 3
261 #define bSWAP 0
262 #elif defined(__LITTLE_ENDIAN)
263 #define bE 0
264 #define bSWAP 0
265 #else
266 #error "__BIG_ENDIAN or __LITTLE_ENDIAN must be defined, did you include byteorder.h?"
267 #endif
268 #ifndef bEBus
269 #ifdef CONFIG_53C700_BE_BUS
270 #define bEBus 1
271 #else
272 #define bEBus 0
273 #endif
274 #endif
275 #define bS_to_cpu(x) (bSWAP ? le32_to_cpu(x) : (x))
276 #define bS_to_host(x) (bSWAP ? cpu_to_le32(x) : (x))
277
278 /* NOTE: These registers are in the LE register space only, the required byte
279 * swapping is done by the NCR_700_{read|write}[b] functions */
280 #define SCNTL0_REG 0x00
281 #define FULL_ARBITRATION 0xc0
282 #define PARITY 0x08
283 #define ENABLE_PARITY 0x04
284 #define AUTO_ATN 0x02
285 #define SCNTL1_REG 0x01
286 #define SLOW_BUS 0x80
287 #define ENABLE_SELECT 0x20
288 #define ASSERT_RST 0x08
289 #define ASSERT_EVEN_PARITY 0x04
290 #define SDID_REG 0x02
291 #define SIEN_REG 0x03
292 #define PHASE_MM_INT 0x80
293 #define FUNC_COMP_INT 0x40
294 #define SEL_TIMEOUT_INT 0x20
295 #define SELECT_INT 0x10
296 #define GROSS_ERR_INT 0x08
297 #define UX_DISC_INT 0x04
298 #define RST_INT 0x02
299 #define PAR_ERR_INT 0x01
300 #define SCID_REG 0x04
301 #define SXFER_REG 0x05
302 #define ASYNC_OPERATION 0x00
303 #define SODL_REG 0x06
304 #define SOCL_REG 0x07
305 #define SFBR_REG 0x08
306 #define SIDL_REG 0x09
307 #define SBDL_REG 0x0A
308 #define SBCL_REG 0x0B
309 /* read bits */
310 #define SBCL_IO 0x01
311 /*write bits */
312 #define SYNC_DIV_AS_ASYNC 0x00
313 #define SYNC_DIV_1_0 0x01
314 #define SYNC_DIV_1_5 0x02
315 #define SYNC_DIV_2_0 0x03
316 #define DSTAT_REG 0x0C
317 #define ILGL_INST_DETECTED 0x01
318 #define WATCH_DOG_INTERRUPT 0x02
319 #define SCRIPT_INT_RECEIVED 0x04
320 #define ABORTED 0x10
321 #define SSTAT0_REG 0x0D
322 #define PARITY_ERROR 0x01
323 #define SCSI_RESET_DETECTED 0x02
324 #define UNEXPECTED_DISCONNECT 0x04
325 #define SCSI_GROSS_ERROR 0x08
326 #define SELECTED 0x10
327 #define SELECTION_TIMEOUT 0x20
328 #define FUNCTION_COMPLETE 0x40
329 #define PHASE_MISMATCH 0x80
330 #define SSTAT1_REG 0x0E
331 #define SIDL_REG_FULL 0x80
332 #define SODR_REG_FULL 0x40
333 #define SODL_REG_FULL 0x20
334 #define SSTAT2_REG 0x0F
335 #define CTEST0_REG 0x14
336 #define BTB_TIMER_DISABLE 0x40
337 #define CTEST1_REG 0x15
338 #define CTEST2_REG 0x16
339 #define CTEST3_REG 0x17
340 #define CTEST4_REG 0x18
341 #define DISABLE_FIFO 0x00
342 #define SLBE 0x10
343 #define SFWR 0x08
344 #define BYTE_LANE0 0x04
345 #define BYTE_LANE1 0x05
346 #define BYTE_LANE2 0x06
347 #define BYTE_LANE3 0x07
348 #define SCSI_ZMODE 0x20
349 #define ZMODE 0x40
350 #define CTEST5_REG 0x19
351 #define MASTER_CONTROL 0x10
352 #define DMA_DIRECTION 0x08
353 #define CTEST7_REG 0x1B
354 #define BURST_DISABLE 0x80 /* 710 only */
355 #define SEL_TIMEOUT_DISABLE 0x10 /* 710 only */
356 #define DFP 0x08
357 #define EVP 0x04
358 #define CTEST7_TT1 0x02
359 #define DIFF 0x01
360 #define CTEST6_REG 0x1A
361 #define TEMP_REG 0x1C
362 #define DFIFO_REG 0x20
363 #define FLUSH_DMA_FIFO 0x80
364 #define CLR_FIFO 0x40
365 #define ISTAT_REG 0x21
366 #define ABORT_OPERATION 0x80
367 #define SOFTWARE_RESET_710 0x40
368 #define DMA_INT_PENDING 0x01
369 #define SCSI_INT_PENDING 0x02
370 #define CONNECTED 0x08
371 #define CTEST8_REG 0x22
372 #define LAST_DIS_ENBL 0x01
373 #define SHORTEN_FILTERING 0x04
374 #define ENABLE_ACTIVE_NEGATION 0x10
375 #define GENERATE_RECEIVE_PARITY 0x20
376 #define CLR_FIFO_710 0x04
377 #define FLUSH_DMA_FIFO_710 0x08
378 #define CTEST9_REG 0x23
379 #define DBC_REG 0x24
380 #define DCMD_REG 0x27
381 #define DNAD_REG 0x28
382 #define DIEN_REG 0x39
383 #define BUS_FAULT 0x20
384 #define ABORT_INT 0x10
385 #define INT_INST_INT 0x04
386 #define WD_INT 0x02
387 #define ILGL_INST_INT 0x01
388 #define DCNTL_REG 0x3B
389 #define SOFTWARE_RESET 0x01
390 #define COMPAT_700_MODE 0x01
391 #define SCRPTS_16BITS 0x20
392 #define EA_710 0x20
393 #define ASYNC_DIV_2_0 0x00
394 #define ASYNC_DIV_1_5 0x40
395 #define ASYNC_DIV_1_0 0x80
396 #define ASYNC_DIV_3_0 0xc0
397 #define DMODE_710_REG 0x38
398 #define DMODE_700_REG 0x34
399 #define BURST_LENGTH_1 0x00
400 #define BURST_LENGTH_2 0x40
401 #define BURST_LENGTH_4 0x80
402 #define BURST_LENGTH_8 0xC0
403 #define DMODE_FC1 0x10
404 #define DMODE_FC2 0x20
405 #define BW16 32
406 #define MODE_286 16
407 #define IO_XFER 8
408 #define FIXED_ADDR 4
409
410 #define DSP_REG 0x2C
411 #define DSPS_REG 0x30
412
413 /* Parameters to begin SDTR negotiations. Empirically, I find that
414 * the 53c700-66 cannot handle an offset >8, so don't change this */
415 #define NCR_700_MAX_OFFSET 8
416 /* Was hoping the max offset would be greater for the 710, but
417 * empirically it seems to be 8 also */
418 #define NCR_710_MAX_OFFSET 8
419 #define NCR_700_MIN_XFERP 1
420 #define NCR_710_MIN_XFERP 0
421 #define NCR_700_MIN_PERIOD 25 /* for SDTR message, 100ns */
422
423 #define script_patch_32(dev, script, symbol, value) \
424 { \
425 int i; \
426 for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
427 __u32 val = bS_to_cpu((script)[A_##symbol##_used[i]]) + value; \
428 (script)[A_##symbol##_used[i]] = bS_to_host(val); \
429 dma_cache_sync((dev), &(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
430 DEBUG((" script, patching %s at %d to 0x%lx\n", \
431 #symbol, A_##symbol##_used[i], (value))); \
432 } \
433 }
434
435 #define script_patch_32_abs(dev, script, symbol, value) \
436 { \
437 int i; \
438 for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
439 (script)[A_##symbol##_used[i]] = bS_to_host(value); \
440 dma_cache_sync((dev), &(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
441 DEBUG((" script, patching %s at %d to 0x%lx\n", \
442 #symbol, A_##symbol##_used[i], (value))); \
443 } \
444 }
445
446 /* Used for patching the SCSI ID in the SELECT instruction */
447 #define script_patch_ID(dev, script, symbol, value) \
448 { \
449 int i; \
450 for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
451 __u32 val = bS_to_cpu((script)[A_##symbol##_used[i]]); \
452 val &= 0xff00ffff; \
453 val |= ((value) & 0xff) << 16; \
454 (script)[A_##symbol##_used[i]] = bS_to_host(val); \
455 dma_cache_sync((dev), &(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
456 DEBUG((" script, patching ID field %s at %d to 0x%x\n", \
457 #symbol, A_##symbol##_used[i], val)); \
458 } \
459 }
460
461 #define script_patch_16(dev, script, symbol, value) \
462 { \
463 int i; \
464 for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
465 __u32 val = bS_to_cpu((script)[A_##symbol##_used[i]]); \
466 val &= 0xffff0000; \
467 val |= ((value) & 0xffff); \
468 (script)[A_##symbol##_used[i]] = bS_to_host(val); \
469 dma_cache_sync((dev), &(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
470 DEBUG((" script, patching short field %s at %d to 0x%x\n", \
471 #symbol, A_##symbol##_used[i], val)); \
472 } \
473 }
474
475
476 static inline __u8
477 NCR_700_readb(struct Scsi_Host *host, __u32 reg)
478 {
479 const struct NCR_700_Host_Parameters *hostdata
480 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
481
482 return ioread8(hostdata->base + (reg^bE));
483 }
484
485 static inline __u32
486 NCR_700_readl(struct Scsi_Host *host, __u32 reg)
487 {
488 const struct NCR_700_Host_Parameters *hostdata
489 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
490 __u32 value = bEBus ? ioread32be(hostdata->base + reg) :
491 ioread32(hostdata->base + reg);
492 #if 1
493 /* sanity check the register */
494 BUG_ON((reg & 0x3) != 0);
495 #endif
496
497 return value;
498 }
499
500 static inline void
501 NCR_700_writeb(__u8 value, struct Scsi_Host *host, __u32 reg)
502 {
503 const struct NCR_700_Host_Parameters *hostdata
504 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
505
506 iowrite8(value, hostdata->base + (reg^bE));
507 }
508
509 static inline void
510 NCR_700_writel(__u32 value, struct Scsi_Host *host, __u32 reg)
511 {
512 const struct NCR_700_Host_Parameters *hostdata
513 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
514
515 #if 1
516 /* sanity check the register */
517 BUG_ON((reg & 0x3) != 0);
518 #endif
519
520 bEBus ? iowrite32be(value, hostdata->base + reg):
521 iowrite32(value, hostdata->base + reg);
522 }
523
524 #endif
USB Experimental Work