1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* -*- mode: c; c-basic-offset: 8 -*- */
3
4 /* Driver for 53c700 and 53c700-66 chips from NCR and Symbios
5 *
6 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
7 */
8
9 #ifndef _53C700_H
10 #define _53C700_H
11
12 #include <linux/interrupt.h>
13 #include <asm/io.h>
14
15 #include <scsi/scsi_device.h>
16 #include <scsi/scsi_cmnd.h>
17
18 /* Turn on for general debugging---too verbose for normal use */
19 #undef NCR_700_DEBUG
20 /* Debug the tag queues, checking hash queue allocation and deallocation
21 * and search for duplicate tags */
22 #undef NCR_700_TAG_DEBUG
23
24 #ifdef NCR_700_DEBUG
25 #define DEBUG(x) printk x
26 #define DDEBUG(prefix, sdev, fmt, a...) \
27 sdev_printk(prefix, sdev, fmt, ##a)
28 #define CDEBUG(prefix, scmd, fmt, a...) \
29 scmd_printk(prefix, scmd, fmt, ##a)
30 #else
31 #define DEBUG(x) do {} while (0)
32 #define DDEBUG(prefix, scmd, fmt, a...) do {} while (0)
33 #define CDEBUG(prefix, scmd, fmt, a...) do {} while (0)
34 #endif
35
36 /* The number of available command slots */
37 #define NCR_700_COMMAND_SLOTS_PER_HOST 64
38 /* The maximum number of Scatter Gathers we allow */
39 #define NCR_700_SG_SEGMENTS 32
40 /* The maximum number of luns (make this of the form 2^n) */
41 #define NCR_700_MAX_LUNS 32
42 #define NCR_700_LUN_MASK (NCR_700_MAX_LUNS - 1)
43 /* Maximum number of tags the driver ever allows per device */
44 #define NCR_700_MAX_TAGS 16
45 /* Tag depth the driver starts out with (can be altered in sysfs) */
46 #define NCR_700_DEFAULT_TAGS 4
47 /* This is the default number of commands per LUN in the untagged case.
48 * two is a good value because it means we can have one command active and
49 * one command fully prepared and waiting
50 */
51 #define NCR_700_CMD_PER_LUN 2
52 /* magic byte identifying an internally generated REQUEST_SENSE command */
53 #define NCR_700_INTERNAL_SENSE_MAGIC 0x42
54
55 struct NCR_700_Host_Parameters;
56
57 /* These are the externally used routines */
58 struct Scsi_Host *NCR_700_detect(struct scsi_host_template *,
59 struct NCR_700_Host_Parameters *, struct device *);
60 int NCR_700_release(struct Scsi_Host *host);
61 irqreturn_t NCR_700_intr(int, void *);
62
63
64 enum NCR_700_Host_State {
65 NCR_700_HOST_BUSY,
66 NCR_700_HOST_FREE,
67 };
68
69 struct NCR_700_SG_List {
70 /* The following is a script fragment to move the buffer onto the
71 * bus and then link the next fragment or return */
72 #define SCRIPT_MOVE_DATA_IN 0x09000000
73 #define SCRIPT_MOVE_DATA_OUT 0x08000000
74 __u32 ins;
75 __u32 pAddr;
76 #define SCRIPT_NOP 0x80000000
77 #define SCRIPT_RETURN 0x90080000
78 };
79
80 struct NCR_700_Device_Parameters {
81 /* space for creating a request sense command. Really, except
82 * for the annoying SCSI-2 requirement for LUN information in
83 * cmnd[1], this could be in static storage */
84 unsigned char cmnd[MAX_COMMAND_SIZE];
85 __u8 depth;
86 struct scsi_cmnd *current_cmnd; /* currently active command */
87 };
88
89
90 /* The SYNC negotiation sequence looks like:
91 *
92 * If DEV_NEGOTIATED_SYNC not set, tack and SDTR message on to the
93 * initial identify for the device and set DEV_BEGIN_SYNC_NEGOTATION
94 * If we get an SDTR reply, work out the SXFER parameters, squirrel
95 * them away here, clear DEV_BEGIN_SYNC_NEGOTIATION and set
96 * DEV_NEGOTIATED_SYNC. If we get a REJECT msg, squirrel
97 *
98 *
99 * 0:7 SXFER_REG negotiated value for this device
100 * 8:15 Current queue depth
101 * 16 negotiated SYNC flag
102 * 17 begin SYNC negotiation flag
103 * 18 device supports tag queueing */
104 #define NCR_700_DEV_NEGOTIATED_SYNC (1<<16)
105 #define NCR_700_DEV_BEGIN_SYNC_NEGOTIATION (1<<17)
106 #define NCR_700_DEV_PRINT_SYNC_NEGOTIATION (1<<19)
107
NCR_700_get_sense_cmnd(struct scsi_device * SDp)108 static inline char *NCR_700_get_sense_cmnd(struct scsi_device *SDp)
109 {
110 struct NCR_700_Device_Parameters *hostdata = SDp->hostdata;
111
112 return hostdata->cmnd;
113 }
114
115 static inline void
NCR_700_set_depth(struct scsi_device * SDp,__u8 depth)116 NCR_700_set_depth(struct scsi_device *SDp, __u8 depth)
117 {
118 struct NCR_700_Device_Parameters *hostdata = SDp->hostdata;
119
120 hostdata->depth = depth;
121 }
122 static inline __u8
NCR_700_get_depth(struct scsi_device * SDp)123 NCR_700_get_depth(struct scsi_device *SDp)
124 {
125 struct NCR_700_Device_Parameters *hostdata = SDp->hostdata;
126
127 return hostdata->depth;
128 }
129 static inline int
NCR_700_is_flag_set(struct scsi_device * SDp,__u32 flag)130 NCR_700_is_flag_set(struct scsi_device *SDp, __u32 flag)
131 {
132 return (spi_flags(SDp->sdev_target) & flag) == flag;
133 }
134 static inline int
NCR_700_is_flag_clear(struct scsi_device * SDp,__u32 flag)135 NCR_700_is_flag_clear(struct scsi_device *SDp, __u32 flag)
136 {
137 return (spi_flags(SDp->sdev_target) & flag) == 0;
138 }
139 static inline void
NCR_700_set_flag(struct scsi_device * SDp,__u32 flag)140 NCR_700_set_flag(struct scsi_device *SDp, __u32 flag)
141 {
142 spi_flags(SDp->sdev_target) |= flag;
143 }
144 static inline void
NCR_700_clear_flag(struct scsi_device * SDp,__u32 flag)145 NCR_700_clear_flag(struct scsi_device *SDp, __u32 flag)
146 {
147 spi_flags(SDp->sdev_target) &= ~flag;
148 }
149
150 enum NCR_700_tag_neg_state {
151 NCR_700_START_TAG_NEGOTIATION = 0,
152 NCR_700_DURING_TAG_NEGOTIATION = 1,
153 NCR_700_FINISHED_TAG_NEGOTIATION = 2,
154 };
155
156 static inline enum NCR_700_tag_neg_state
NCR_700_get_tag_neg_state(struct scsi_device * SDp)157 NCR_700_get_tag_neg_state(struct scsi_device *SDp)
158 {
159 return (enum NCR_700_tag_neg_state)((spi_flags(SDp->sdev_target)>>20) & 0x3);
160 }
161
162 static inline void
NCR_700_set_tag_neg_state(struct scsi_device * SDp,enum NCR_700_tag_neg_state state)163 NCR_700_set_tag_neg_state(struct scsi_device *SDp,
164 enum NCR_700_tag_neg_state state)
165 {
166 /* clear the slot */
167 spi_flags(SDp->sdev_target) &= ~(0x3 << 20);
168 spi_flags(SDp->sdev_target) |= ((__u32)state) << 20;
169 }
170
171 struct NCR_700_command_slot {
172 struct NCR_700_SG_List SG[NCR_700_SG_SEGMENTS+1];
173 struct NCR_700_SG_List *pSG;
174 #define NCR_700_SLOT_MASK 0xFC
175 #define NCR_700_SLOT_MAGIC 0xb8
176 #define NCR_700_SLOT_FREE (0|NCR_700_SLOT_MAGIC) /* slot may be used */
177 #define NCR_700_SLOT_BUSY (1|NCR_700_SLOT_MAGIC) /* slot has command active on HA */
178 #define NCR_700_SLOT_QUEUED (2|NCR_700_SLOT_MAGIC) /* slot has command to be made active on HA */
179 __u8 state;
180 #define NCR_700_FLAG_AUTOSENSE 0x01
181 __u8 flags;
182 __u8 pad1[2]; /* Needed for m68k where min alignment is 2 bytes */
183 int tag;
184 __u32 resume_offset;
185 struct scsi_cmnd *cmnd;
186 /* The pci_mapped address of the actual command in cmnd */
187 dma_addr_t pCmd;
188 __u32 temp;
189 /* if this command is a pci_single mapping, holds the dma address
190 * for later unmapping in the done routine */
191 dma_addr_t dma_handle;
192 /* historical remnant, now used to link free commands */
193 struct NCR_700_command_slot *ITL_forw;
194 };
195
196 struct NCR_700_Host_Parameters {
197 /* These must be filled in by the calling driver */
198 int clock; /* board clock speed in MHz */
199 void __iomem *base; /* the base for the port (copied to host) */
200 struct device *dev;
201 __u32 dmode_extra; /* adjustable bus settings */
202 __u32 dcntl_extra; /* adjustable bus settings */
203 __u32 ctest7_extra; /* adjustable bus settings */
204 __u32 differential:1; /* if we are differential */
205 #ifdef CONFIG_53C700_LE_ON_BE
206 /* This option is for HP only. Set it if your chip is wired for
207 * little endian on this platform (which is big endian) */
208 __u32 force_le_on_be:1;
209 #endif
210 __u32 chip710:1; /* set if really a 710 not 700 */
211 __u32 burst_length:4; /* set to 0 to disable 710 bursting */
212
213 /* NOTHING BELOW HERE NEEDS ALTERING */
214 __u32 fast:1; /* if we can alter the SCSI bus clock
215 speed (so can negiotiate sync) */
216 int sync_clock; /* The speed of the SYNC core */
217
218 __u32 *script; /* pointer to script location */
219 __u32 pScript; /* physical mem addr of script */
220
221 enum NCR_700_Host_State state; /* protected by state lock */
222 struct scsi_cmnd *cmd;
223 /* Note: pScript contains the single consistent block of
224 * memory. All the msgin, msgout and status are allocated in
225 * this memory too (at separate cache lines). TOTAL_MEM_SIZE
226 * represents the total size of this area */
227 #define MSG_ARRAY_SIZE 8
228 #define MSGOUT_OFFSET (L1_CACHE_ALIGN(sizeof(SCRIPT)))
229 __u8 *msgout;
230 #define MSGIN_OFFSET (MSGOUT_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
231 __u8 *msgin;
232 #define STATUS_OFFSET (MSGIN_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
233 __u8 *status;
234 #define SLOTS_OFFSET (STATUS_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
235 struct NCR_700_command_slot *slots;
236 #define TOTAL_MEM_SIZE (SLOTS_OFFSET + L1_CACHE_ALIGN(sizeof(struct NCR_700_command_slot) * NCR_700_COMMAND_SLOTS_PER_HOST))
237 int saved_slot_position;
238 int command_slot_count; /* protected by state lock */
239 __u8 tag_negotiated;
240 __u8 rev;
241 __u8 reselection_id;
242 __u8 min_period;
243
244 /* Free list, singly linked by ITL_forw elements */
245 struct NCR_700_command_slot *free_list;
246 /* Completion for waited for ops, like reset, abort or
247 * device reset.
248 *
249 * NOTE: relies on single threading in the error handler to
250 * have only one outstanding at once */
251 struct completion *eh_complete;
252 };
253
254 /*
255 * 53C700 Register Interface - the offset from the Selected base
256 * I/O address */
257 #ifdef CONFIG_53C700_LE_ON_BE
258 #define bE (hostdata->force_le_on_be ? 0 : 3)
259 #define bSWAP (hostdata->force_le_on_be)
260 #define bEBus (!hostdata->force_le_on_be)
261 #elif defined(__BIG_ENDIAN)
262 #define bE 3
263 #define bSWAP 0
264 #elif defined(__LITTLE_ENDIAN)
265 #define bE 0
266 #define bSWAP 0
267 #else
268 #error "__BIG_ENDIAN or __LITTLE_ENDIAN must be defined, did you include byteorder.h?"
269 #endif
270 #ifndef bEBus
271 #ifdef CONFIG_53C700_BE_BUS
272 #define bEBus 1
273 #else
274 #define bEBus 0
275 #endif
276 #endif
277 #define bS_to_cpu(x) (bSWAP ? le32_to_cpu(x) : (x))
278 #define bS_to_host(x) (bSWAP ? cpu_to_le32(x) : (x))
279
280 /* NOTE: These registers are in the LE register space only, the required byte
281 * swapping is done by the NCR_700_{read|write}[b] functions */
282 #define SCNTL0_REG 0x00
283 #define FULL_ARBITRATION 0xc0
284 #define PARITY 0x08
285 #define ENABLE_PARITY 0x04
286 #define AUTO_ATN 0x02
287 #define SCNTL1_REG 0x01
288 #define SLOW_BUS 0x80
289 #define ENABLE_SELECT 0x20
290 #define ASSERT_RST 0x08
291 #define ASSERT_EVEN_PARITY 0x04
292 #define SDID_REG 0x02
293 #define SIEN_REG 0x03
294 #define PHASE_MM_INT 0x80
295 #define FUNC_COMP_INT 0x40
296 #define SEL_TIMEOUT_INT 0x20
297 #define SELECT_INT 0x10
298 #define GROSS_ERR_INT 0x08
299 #define UX_DISC_INT 0x04
300 #define RST_INT 0x02
301 #define PAR_ERR_INT 0x01
302 #define SCID_REG 0x04
303 #define SXFER_REG 0x05
304 #define ASYNC_OPERATION 0x00
305 #define SODL_REG 0x06
306 #define SOCL_REG 0x07
307 #define SFBR_REG 0x08
308 #define SIDL_REG 0x09
309 #define SBDL_REG 0x0A
310 #define SBCL_REG 0x0B
311 /* read bits */
312 #define SBCL_IO 0x01
313 /*write bits */
314 #define SYNC_DIV_AS_ASYNC 0x00
315 #define SYNC_DIV_1_0 0x01
316 #define SYNC_DIV_1_5 0x02
317 #define SYNC_DIV_2_0 0x03
318 #define DSTAT_REG 0x0C
319 #define ILGL_INST_DETECTED 0x01
320 #define WATCH_DOG_INTERRUPT 0x02
321 #define SCRIPT_INT_RECEIVED 0x04
322 #define ABORTED 0x10
323 #define SSTAT0_REG 0x0D
324 #define PARITY_ERROR 0x01
325 #define SCSI_RESET_DETECTED 0x02
326 #define UNEXPECTED_DISCONNECT 0x04
327 #define SCSI_GROSS_ERROR 0x08
328 #define SELECTED 0x10
329 #define SELECTION_TIMEOUT 0x20
330 #define FUNCTION_COMPLETE 0x40
331 #define PHASE_MISMATCH 0x80
332 #define SSTAT1_REG 0x0E
333 #define SIDL_REG_FULL 0x80
334 #define SODR_REG_FULL 0x40
335 #define SODL_REG_FULL 0x20
336 #define SSTAT2_REG 0x0F
337 #define CTEST0_REG 0x14
338 #define BTB_TIMER_DISABLE 0x40
339 #define CTEST1_REG 0x15
340 #define CTEST2_REG 0x16
341 #define CTEST3_REG 0x17
342 #define CTEST4_REG 0x18
343 #define DISABLE_FIFO 0x00
344 #define SLBE 0x10
345 #define SFWR 0x08
346 #define BYTE_LANE0 0x04
347 #define BYTE_LANE1 0x05
348 #define BYTE_LANE2 0x06
349 #define BYTE_LANE3 0x07
350 #define SCSI_ZMODE 0x20
351 #define ZMODE 0x40
352 #define CTEST5_REG 0x19
353 #define MASTER_CONTROL 0x10
354 #define DMA_DIRECTION 0x08
355 #define CTEST7_REG 0x1B
356 #define BURST_DISABLE 0x80 /* 710 only */
357 #define SEL_TIMEOUT_DISABLE 0x10 /* 710 only */
358 #define DFP 0x08
359 #define EVP 0x04
360 #define CTEST7_TT1 0x02
361 #define DIFF 0x01
362 #define CTEST6_REG 0x1A
363 #define TEMP_REG 0x1C
364 #define DFIFO_REG 0x20
365 #define FLUSH_DMA_FIFO 0x80
366 #define CLR_FIFO 0x40
367 #define ISTAT_REG 0x21
368 #define ABORT_OPERATION 0x80
369 #define SOFTWARE_RESET_710 0x40
370 #define DMA_INT_PENDING 0x01
371 #define SCSI_INT_PENDING 0x02
372 #define CONNECTED 0x08
373 #define CTEST8_REG 0x22
374 #define LAST_DIS_ENBL 0x01
375 #define SHORTEN_FILTERING 0x04
376 #define ENABLE_ACTIVE_NEGATION 0x10
377 #define GENERATE_RECEIVE_PARITY 0x20
378 #define CLR_FIFO_710 0x04
379 #define FLUSH_DMA_FIFO_710 0x08
380 #define CTEST9_REG 0x23
381 #define DBC_REG 0x24
382 #define DCMD_REG 0x27
383 #define DNAD_REG 0x28
384 #define DIEN_REG 0x39
385 #define BUS_FAULT 0x20
386 #define ABORT_INT 0x10
387 #define INT_INST_INT 0x04
388 #define WD_INT 0x02
389 #define ILGL_INST_INT 0x01
390 #define DCNTL_REG 0x3B
391 #define SOFTWARE_RESET 0x01
392 #define COMPAT_700_MODE 0x01
393 #define SCRPTS_16BITS 0x20
394 #define EA_710 0x20
395 #define ASYNC_DIV_2_0 0x00
396 #define ASYNC_DIV_1_5 0x40
397 #define ASYNC_DIV_1_0 0x80
398 #define ASYNC_DIV_3_0 0xc0
399 #define DMODE_710_REG 0x38
400 #define DMODE_700_REG 0x34
401 #define BURST_LENGTH_1 0x00
402 #define BURST_LENGTH_2 0x40
403 #define BURST_LENGTH_4 0x80
404 #define BURST_LENGTH_8 0xC0
405 #define DMODE_FC1 0x10
406 #define DMODE_FC2 0x20
407 #define BW16 32
408 #define MODE_286 16
409 #define IO_XFER 8
410 #define FIXED_ADDR 4
411
412 #define DSP_REG 0x2C
413 #define DSPS_REG 0x30
414
415 /* Parameters to begin SDTR negotiations. Empirically, I find that
416 * the 53c700-66 cannot handle an offset >8, so don't change this */
417 #define NCR_700_MAX_OFFSET 8
418 /* Was hoping the max offset would be greater for the 710, but
419 * empirically it seems to be 8 also */
420 #define NCR_710_MAX_OFFSET 8
421 #define NCR_700_MIN_XFERP 1
422 #define NCR_710_MIN_XFERP 0
423 #define NCR_700_MIN_PERIOD 25 /* for SDTR message, 100ns */
424
425 #define script_patch_32(dev, script, symbol, value) \
426 { \
427 int i; \
428 dma_addr_t da = value; \
429 for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
430 __u32 val = bS_to_cpu((script)[A_##symbol##_used[i]]) + da; \
431 (script)[A_##symbol##_used[i]] = bS_to_host(val); \
432 dma_cache_sync((dev), &(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
433 DEBUG((" script, patching %s at %d to %pad\n", \
434 #symbol, A_##symbol##_used[i], &da)); \
435 } \
436 }
437
438 #define script_patch_32_abs(dev, script, symbol, value) \
439 { \
440 int i; \
441 dma_addr_t da = value; \
442 for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
443 (script)[A_##symbol##_used[i]] = bS_to_host(da); \
444 dma_cache_sync((dev), &(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
445 DEBUG((" script, patching %s at %d to %pad\n", \
446 #symbol, A_##symbol##_used[i], &da)); \
447 } \
448 }
449
450 /* Used for patching the SCSI ID in the SELECT instruction */
451 #define script_patch_ID(dev, script, symbol, value) \
452 { \
453 int i; \
454 for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
455 __u32 val = bS_to_cpu((script)[A_##symbol##_used[i]]); \
456 val &= 0xff00ffff; \
457 val |= ((value) & 0xff) << 16; \
458 (script)[A_##symbol##_used[i]] = bS_to_host(val); \
459 dma_cache_sync((dev), &(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
460 DEBUG((" script, patching ID field %s at %d to 0x%x\n", \
461 #symbol, A_##symbol##_used[i], val)); \
462 } \
463 }
464
465 #define script_patch_16(dev, script, symbol, value) \
466 { \
467 int i; \
468 for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
469 __u32 val = bS_to_cpu((script)[A_##symbol##_used[i]]); \
470 val &= 0xffff0000; \
471 val |= ((value) & 0xffff); \
472 (script)[A_##symbol##_used[i]] = bS_to_host(val); \
473 dma_cache_sync((dev), &(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
474 DEBUG((" script, patching short field %s at %d to 0x%x\n", \
475 #symbol, A_##symbol##_used[i], val)); \
476 } \
477 }
478
479
480 static inline __u8
NCR_700_readb(struct Scsi_Host * host,__u32 reg)481 NCR_700_readb(struct Scsi_Host *host, __u32 reg)
482 {
483 const struct NCR_700_Host_Parameters *hostdata
484 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
485
486 return ioread8(hostdata->base + (reg^bE));
487 }
488
489 static inline __u32
NCR_700_readl(struct Scsi_Host * host,__u32 reg)490 NCR_700_readl(struct Scsi_Host *host, __u32 reg)
491 {
492 const struct NCR_700_Host_Parameters *hostdata
493 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
494 __u32 value = bEBus ? ioread32be(hostdata->base + reg) :
495 ioread32(hostdata->base + reg);
496 #if 1
497 /* sanity check the register */
498 BUG_ON((reg & 0x3) != 0);
499 #endif
500
501 return value;
502 }
503
504 static inline void
NCR_700_writeb(__u8 value,struct Scsi_Host * host,__u32 reg)505 NCR_700_writeb(__u8 value, struct Scsi_Host *host, __u32 reg)
506 {
507 const struct NCR_700_Host_Parameters *hostdata
508 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
509
510 iowrite8(value, hostdata->base + (reg^bE));
511 }
512
513 static inline void
NCR_700_writel(__u32 value,struct Scsi_Host * host,__u32 reg)514 NCR_700_writel(__u32 value, struct Scsi_Host *host, __u32 reg)
515 {
516 const struct NCR_700_Host_Parameters *hostdata
517 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
518
519 #if 1
520 /* sanity check the register */
521 BUG_ON((reg & 0x3) != 0);
522 #endif
523
524 bEBus ? iowrite32be(value, hostdata->base + reg):
525 iowrite32(value, hostdata->base + reg);
526 }
527
528 #endif
529
