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be2net: account for skb allocation failures
[linux-2.6.git] / drivers / scsi / esp_scsi.h
blob28e22acf87ea94f9c703086689da850174495573
1 /* esp_scsi.h: Defines and structures for the ESP drier.
2 *
3 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
4 */
5
6 #ifndef _ESP_SCSI_H
7 #define _ESP_SCSI_H
8
9 /* Access Description Offset */
10 #define ESP_TCLOW 0x00UL /* rw Low bits transfer count 0x00 */
11 #define ESP_TCMED 0x01UL /* rw Mid bits transfer count 0x04 */
12 #define ESP_FDATA 0x02UL /* rw FIFO data bits 0x08 */
13 #define ESP_CMD 0x03UL /* rw SCSI command bits 0x0c */
14 #define ESP_STATUS 0x04UL /* ro ESP status register 0x10 */
15 #define ESP_BUSID ESP_STATUS /* wo BusID for sel/resel 0x10 */
16 #define ESP_INTRPT 0x05UL /* ro Kind of interrupt 0x14 */
17 #define ESP_TIMEO ESP_INTRPT /* wo Timeout for sel/resel 0x14 */
18 #define ESP_SSTEP 0x06UL /* ro Sequence step register 0x18 */
19 #define ESP_STP ESP_SSTEP /* wo Transfer period/sync 0x18 */
20 #define ESP_FFLAGS 0x07UL /* ro Bits current FIFO info 0x1c */
21 #define ESP_SOFF ESP_FFLAGS /* wo Sync offset 0x1c */
22 #define ESP_CFG1 0x08UL /* rw First cfg register 0x20 */
23 #define ESP_CFACT 0x09UL /* wo Clock conv factor 0x24 */
24 #define ESP_STATUS2 ESP_CFACT /* ro HME status2 register 0x24 */
25 #define ESP_CTEST 0x0aUL /* wo Chip test register 0x28 */
26 #define ESP_CFG2 0x0bUL /* rw Second cfg register 0x2c */
27 #define ESP_CFG3 0x0cUL /* rw Third cfg register 0x30 */
28 #define ESP_TCHI 0x0eUL /* rw High bits transf count 0x38 */
29 #define ESP_UID ESP_TCHI /* ro Unique ID code 0x38 */
30 #define FAS_RLO ESP_TCHI /* rw HME extended counter 0x38 */
31 #define ESP_FGRND 0x0fUL /* rw Data base for fifo 0x3c */
32 #define FAS_RHI ESP_FGRND /* rw HME extended counter 0x3c */
33
34 #define SBUS_ESP_REG_SIZE 0x40UL
35
36 /* Bitfield meanings for the above registers. */
37
38 /* ESP config reg 1, read-write, found on all ESP chips */
39 #define ESP_CONFIG1_ID 0x07 /* My BUS ID bits */
40 #define ESP_CONFIG1_CHTEST 0x08 /* Enable ESP chip tests */
41 #define ESP_CONFIG1_PENABLE 0x10 /* Enable parity checks */
42 #define ESP_CONFIG1_PARTEST 0x20 /* Parity test mode enabled? */
43 #define ESP_CONFIG1_SRRDISAB 0x40 /* Disable SCSI reset reports */
44 #define ESP_CONFIG1_SLCABLE 0x80 /* Enable slow cable mode */
45
46 /* ESP config reg 2, read-write, found only on esp100a+esp200+esp236 chips */
47 #define ESP_CONFIG2_DMAPARITY 0x01 /* enable DMA Parity (200,236) */
48 #define ESP_CONFIG2_REGPARITY 0x02 /* enable reg Parity (200,236) */
49 #define ESP_CONFIG2_BADPARITY 0x04 /* Bad parity target abort */
50 #define ESP_CONFIG2_SCSI2ENAB 0x08 /* Enable SCSI-2 features (tgtmode) */
51 #define ESP_CONFIG2_HI 0x10 /* High Impedance DREQ ??? */
52 #define ESP_CONFIG2_HMEFENAB 0x10 /* HME features enable */
53 #define ESP_CONFIG2_BCM 0x20 /* Enable byte-ctrl (236) */
54 #define ESP_CONFIG2_DISPINT 0x20 /* Disable pause irq (hme) */
55 #define ESP_CONFIG2_FENAB 0x40 /* Enable features (fas100,216) */
56 #define ESP_CONFIG2_SPL 0x40 /* Enable status-phase latch (236) */
57 #define ESP_CONFIG2_MKDONE 0x40 /* HME magic feature */
58 #define ESP_CONFIG2_HME32 0x80 /* HME 32 extended */
59 #define ESP_CONFIG2_MAGIC 0xe0 /* Invalid bits... */
60
61 /* ESP config register 3 read-write, found only esp236+fas236+fas100a+hme chips */
62 #define ESP_CONFIG3_FCLOCK 0x01 /* FAST SCSI clock rate (esp100a/hme) */
63 #define ESP_CONFIG3_TEM 0x01 /* Enable thresh-8 mode (esp/fas236) */
64 #define ESP_CONFIG3_FAST 0x02 /* Enable FAST SCSI (esp100a/hme) */
65 #define ESP_CONFIG3_ADMA 0x02 /* Enable alternate-dma (esp/fas236) */
66 #define ESP_CONFIG3_TENB 0x04 /* group2 SCSI2 support (esp100a/hme) */
67 #define ESP_CONFIG3_SRB 0x04 /* Save residual byte (esp/fas236) */
68 #define ESP_CONFIG3_TMS 0x08 /* Three-byte msg's ok (esp100a/hme) */
69 #define ESP_CONFIG3_FCLK 0x08 /* Fast SCSI clock rate (esp/fas236) */
70 #define ESP_CONFIG3_IDMSG 0x10 /* ID message checking (esp100a/hme) */
71 #define ESP_CONFIG3_FSCSI 0x10 /* Enable FAST SCSI (esp/fas236) */
72 #define ESP_CONFIG3_GTM 0x20 /* group2 SCSI2 support (esp/fas236) */
73 #define ESP_CONFIG3_IDBIT3 0x20 /* Bit 3 of HME SCSI-ID (hme) */
74 #define ESP_CONFIG3_TBMS 0x40 /* Three-byte msg's ok (esp/fas236) */
75 #define ESP_CONFIG3_EWIDE 0x40 /* Enable Wide-SCSI (hme) */
76 #define ESP_CONFIG3_IMS 0x80 /* ID msg chk'ng (esp/fas236) */
77 #define ESP_CONFIG3_OBPUSH 0x80 /* Push odd-byte to dma (hme) */
78
79 /* ESP command register read-write */
80 /* Group 1 commands: These may be sent at any point in time to the ESP
81 * chip. None of them can generate interrupts 'cept
82 * the "SCSI bus reset" command if you have not disabled
83 * SCSI reset interrupts in the config1 ESP register.
84 */
85 #define ESP_CMD_NULL 0x00 /* Null command, ie. a nop */
86 #define ESP_CMD_FLUSH 0x01 /* FIFO Flush */
87 #define ESP_CMD_RC 0x02 /* Chip reset */
88 #define ESP_CMD_RS 0x03 /* SCSI bus reset */
89
90 /* Group 2 commands: ESP must be an initiator and connected to a target
91 * for these commands to work.
92 */
93 #define ESP_CMD_TI 0x10 /* Transfer Information */
94 #define ESP_CMD_ICCSEQ 0x11 /* Initiator cmd complete sequence */
95 #define ESP_CMD_MOK 0x12 /* Message okie-dokie */
96 #define ESP_CMD_TPAD 0x18 /* Transfer Pad */
97 #define ESP_CMD_SATN 0x1a /* Set ATN */
98 #define ESP_CMD_RATN 0x1b /* De-assert ATN */
99
100 /* Group 3 commands: ESP must be in the MSGOUT or MSGIN state and be connected
101 * to a target as the initiator for these commands to work.
102 */
103 #define ESP_CMD_SMSG 0x20 /* Send message */
104 #define ESP_CMD_SSTAT 0x21 /* Send status */
105 #define ESP_CMD_SDATA 0x22 /* Send data */
106 #define ESP_CMD_DSEQ 0x23 /* Discontinue Sequence */
107 #define ESP_CMD_TSEQ 0x24 /* Terminate Sequence */
108 #define ESP_CMD_TCCSEQ 0x25 /* Target cmd cmplt sequence */
109 #define ESP_CMD_DCNCT 0x27 /* Disconnect */
110 #define ESP_CMD_RMSG 0x28 /* Receive Message */
111 #define ESP_CMD_RCMD 0x29 /* Receive Command */
112 #define ESP_CMD_RDATA 0x2a /* Receive Data */
113 #define ESP_CMD_RCSEQ 0x2b /* Receive cmd sequence */
114
115 /* Group 4 commands: The ESP must be in the disconnected state and must
116 * not be connected to any targets as initiator for
117 * these commands to work.
118 */
119 #define ESP_CMD_RSEL 0x40 /* Reselect */
120 #define ESP_CMD_SEL 0x41 /* Select w/o ATN */
121 #define ESP_CMD_SELA 0x42 /* Select w/ATN */
122 #define ESP_CMD_SELAS 0x43 /* Select w/ATN & STOP */
123 #define ESP_CMD_ESEL 0x44 /* Enable selection */
124 #define ESP_CMD_DSEL 0x45 /* Disable selections */
125 #define ESP_CMD_SA3 0x46 /* Select w/ATN3 */
126 #define ESP_CMD_RSEL3 0x47 /* Reselect3 */
127
128 /* This bit enables the ESP's DMA on the SBus */
129 #define ESP_CMD_DMA 0x80 /* Do DMA? */
130
131 /* ESP status register read-only */
132 #define ESP_STAT_PIO 0x01 /* IO phase bit */
133 #define ESP_STAT_PCD 0x02 /* CD phase bit */
134 #define ESP_STAT_PMSG 0x04 /* MSG phase bit */
135 #define ESP_STAT_PMASK 0x07 /* Mask of phase bits */
136 #define ESP_STAT_TDONE 0x08 /* Transfer Completed */
137 #define ESP_STAT_TCNT 0x10 /* Transfer Counter Is Zero */
138 #define ESP_STAT_PERR 0x20 /* Parity error */
139 #define ESP_STAT_SPAM 0x40 /* Real bad error */
140 /* This indicates the 'interrupt pending' condition on esp236, it is a reserved
141 * bit on other revs of the ESP.
142 */
143 #define ESP_STAT_INTR 0x80 /* Interrupt */
144
145 /* The status register can be masked with ESP_STAT_PMASK and compared
146 * with the following values to determine the current phase the ESP
147 * (at least thinks it) is in. For our purposes we also add our own
148 * software 'done' bit for our phase management engine.
149 */
150 #define ESP_DOP (0) /* Data Out */
151 #define ESP_DIP (ESP_STAT_PIO) /* Data In */
152 #define ESP_CMDP (ESP_STAT_PCD) /* Command */
153 #define ESP_STATP (ESP_STAT_PCD|ESP_STAT_PIO) /* Status */
154 #define ESP_MOP (ESP_STAT_PMSG|ESP_STAT_PCD) /* Message Out */
155 #define ESP_MIP (ESP_STAT_PMSG|ESP_STAT_PCD|ESP_STAT_PIO) /* Message In */
156
157 /* HME only: status 2 register */
158 #define ESP_STAT2_SCHBIT 0x01 /* Upper bits 3-7 of sstep enabled */
159 #define ESP_STAT2_FFLAGS 0x02 /* The fifo flags are now latched */
160 #define ESP_STAT2_XCNT 0x04 /* The transfer counter is latched */
161 #define ESP_STAT2_CREGA 0x08 /* The command reg is active now */
162 #define ESP_STAT2_WIDE 0x10 /* Interface on this adapter is wide */
163 #define ESP_STAT2_F1BYTE 0x20 /* There is one byte at top of fifo */
164 #define ESP_STAT2_FMSB 0x40 /* Next byte in fifo is most significant */
165 #define ESP_STAT2_FEMPTY 0x80 /* FIFO is empty */
166
167 /* ESP interrupt register read-only */
168 #define ESP_INTR_S 0x01 /* Select w/o ATN */
169 #define ESP_INTR_SATN 0x02 /* Select w/ATN */
170 #define ESP_INTR_RSEL 0x04 /* Reselected */
171 #define ESP_INTR_FDONE 0x08 /* Function done */
172 #define ESP_INTR_BSERV 0x10 /* Bus service */
173 #define ESP_INTR_DC 0x20 /* Disconnect */
174 #define ESP_INTR_IC 0x40 /* Illegal command given */
175 #define ESP_INTR_SR 0x80 /* SCSI bus reset detected */
176
177 /* ESP sequence step register read-only */
178 #define ESP_STEP_VBITS 0x07 /* Valid bits */
179 #define ESP_STEP_ASEL 0x00 /* Selection&Arbitrate cmplt */
180 #define ESP_STEP_SID 0x01 /* One msg byte sent */
181 #define ESP_STEP_NCMD 0x02 /* Was not in command phase */
182 #define ESP_STEP_PPC 0x03 /* Early phase chg caused cmnd
183 * bytes to be lost
184 */
185 #define ESP_STEP_FINI4 0x04 /* Command was sent ok */
186
187 /* Ho hum, some ESP's set the step register to this as well... */
188 #define ESP_STEP_FINI5 0x05
189 #define ESP_STEP_FINI6 0x06
190 #define ESP_STEP_FINI7 0x07
191
192 /* ESP chip-test register read-write */
193 #define ESP_TEST_TARG 0x01 /* Target test mode */
194 #define ESP_TEST_INI 0x02 /* Initiator test mode */
195 #define ESP_TEST_TS 0x04 /* Tristate test mode */
196
197 /* ESP unique ID register read-only, found on fas236+fas100a only */
198 #define ESP_UID_F100A 0x00 /* ESP FAS100A */
199 #define ESP_UID_F236 0x02 /* ESP FAS236 */
200 #define ESP_UID_REV 0x07 /* ESP revision */
201 #define ESP_UID_FAM 0xf8 /* ESP family */
202
203 /* ESP fifo flags register read-only */
204 /* Note that the following implies a 16 byte FIFO on the ESP. */
205 #define ESP_FF_FBYTES 0x1f /* Num bytes in FIFO */
206 #define ESP_FF_ONOTZERO 0x20 /* offset ctr not zero (esp100) */
207 #define ESP_FF_SSTEP 0xe0 /* Sequence step */
208
209 /* ESP clock conversion factor register write-only */
210 #define ESP_CCF_F0 0x00 /* 35.01MHz - 40MHz */
211 #define ESP_CCF_NEVER 0x01 /* Set it to this and die */
212 #define ESP_CCF_F2 0x02 /* 10MHz */
213 #define ESP_CCF_F3 0x03 /* 10.01MHz - 15MHz */
214 #define ESP_CCF_F4 0x04 /* 15.01MHz - 20MHz */
215 #define ESP_CCF_F5 0x05 /* 20.01MHz - 25MHz */
216 #define ESP_CCF_F6 0x06 /* 25.01MHz - 30MHz */
217 #define ESP_CCF_F7 0x07 /* 30.01MHz - 35MHz */
218
219 /* HME only... */
220 #define ESP_BUSID_RESELID 0x10
221 #define ESP_BUSID_CTR32BIT 0x40
222
223 #define ESP_BUS_TIMEOUT 250 /* In milli-seconds */
224 #define ESP_TIMEO_CONST 8192
225 #define ESP_NEG_DEFP(mhz, cfact) \
226 ((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (8192 * (cfact)))
227 #define ESP_HZ_TO_CYCLE(hertz) ((1000000000) / ((hertz) / 1000))
228 #define ESP_TICK(ccf, cycle) ((7682 * (ccf) * (cycle) / 1000))
229
230 /* For slow to medium speed input clock rates we shoot for 5mb/s, but for high
231 * input clock rates we try to do 10mb/s although I don't think a transfer can
232 * even run that fast with an ESP even with DMA2 scatter gather pipelining.
233 */
234 #define SYNC_DEFP_SLOW 0x32 /* 5mb/s */
235 #define SYNC_DEFP_FAST 0x19 /* 10mb/s */
236
237 struct esp_cmd_priv {
238 union {
239 dma_addr_t dma_addr;
240 int num_sg;
241 } u;
242
243 int cur_residue;
244 struct scatterlist *cur_sg;
245 int tot_residue;
246 };
247 #define ESP_CMD_PRIV(CMD) ((struct esp_cmd_priv *)(&(CMD)->SCp))
248
249 enum esp_rev {
250 ESP100 = 0x00, /* NCR53C90 - very broken */
251 ESP100A = 0x01, /* NCR53C90A */
252 ESP236 = 0x02,
253 FAS236 = 0x03,
254 FAS100A = 0x04,
255 FAST = 0x05,
256 FASHME = 0x06,
257 };
258
259 struct esp_cmd_entry {
260 struct list_head list;
261
262 struct scsi_cmnd *cmd;
263
264 unsigned int saved_cur_residue;
265 struct scatterlist *saved_cur_sg;
266 unsigned int saved_tot_residue;
267
268 u8 flags;
269 #define ESP_CMD_FLAG_WRITE 0x01 /* DMA is a write */
270 #define ESP_CMD_FLAG_ABORT 0x02 /* being aborted */
271 #define ESP_CMD_FLAG_AUTOSENSE 0x04 /* Doing automatic REQUEST_SENSE */
272
273 u8 tag[2];
274
275 u8 status;
276 u8 message;
277
278 unsigned char *sense_ptr;
279 unsigned char *saved_sense_ptr;
280 dma_addr_t sense_dma;
281
282 struct completion *eh_done;
283 };
284
285 /* XXX make this configurable somehow XXX */
286 #define ESP_DEFAULT_TAGS 16
287
288 #define ESP_MAX_TARGET 16
289 #define ESP_MAX_LUN 8
290 #define ESP_MAX_TAG 256
291
292 struct esp_lun_data {
293 struct esp_cmd_entry *non_tagged_cmd;
294 int num_tagged;
295 int hold;
296 struct esp_cmd_entry *tagged_cmds[ESP_MAX_TAG];
297 };
298
299 struct esp_target_data {
300 /* These are the ESP_STP, ESP_SOFF, and ESP_CFG3 register values which
301 * match the currently negotiated settings for this target. The SCSI
302 * protocol values are maintained in spi_{offset,period,wide}(starget).
303 */
304 u8 esp_period;
305 u8 esp_offset;
306 u8 esp_config3;
307
308 u8 flags;
309 #define ESP_TGT_WIDE 0x01
310 #define ESP_TGT_DISCONNECT 0x02
311 #define ESP_TGT_NEGO_WIDE 0x04
312 #define ESP_TGT_NEGO_SYNC 0x08
313 #define ESP_TGT_CHECK_NEGO 0x40
314 #define ESP_TGT_BROKEN 0x80
315
316 /* When ESP_TGT_CHECK_NEGO is set, on the next scsi command to this
317 * device we will try to negotiate the following parameters.
318 */
319 u8 nego_goal_period;
320 u8 nego_goal_offset;
321 u8 nego_goal_width;
322 u8 nego_goal_tags;
323
324 struct scsi_target *starget;
325 };
326
327 struct esp_event_ent {
328 u8 type;
329 #define ESP_EVENT_TYPE_EVENT 0x01
330 #define ESP_EVENT_TYPE_CMD 0x02
331 u8 val;
332
333 u8 sreg;
334 u8 seqreg;
335 u8 sreg2;
336 u8 ireg;
337 u8 select_state;
338 u8 event;
339 u8 __pad;
340 };
341
342 struct esp;
343 struct esp_driver_ops {
344 /* Read and write the ESP 8-bit registers. On some
345 * applications of the ESP chip the registers are at 4-byte
346 * instead of 1-byte intervals.
347 */
348 void (*esp_write8)(struct esp *esp, u8 val, unsigned long reg);
349 u8 (*esp_read8)(struct esp *esp, unsigned long reg);
350
351 /* Map and unmap DMA memory. Eventually the driver will be
352 * converted to the generic DMA API as soon as SBUS is able to
353 * cope with that. At such time we can remove this.
354 */
355 dma_addr_t (*map_single)(struct esp *esp, void *buf,
356 size_t sz, int dir);
357 int (*map_sg)(struct esp *esp, struct scatterlist *sg,
358 int num_sg, int dir);
359 void (*unmap_single)(struct esp *esp, dma_addr_t addr,
360 size_t sz, int dir);
361 void (*unmap_sg)(struct esp *esp, struct scatterlist *sg,
362 int num_sg, int dir);
363
364 /* Return non-zero if there is an IRQ pending. Usually this
365 * status bit lives in the DMA controller sitting in front of
366 * the ESP. This has to be accurate or else the ESP interrupt
367 * handler will not run.
368 */
369 int (*irq_pending)(struct esp *esp);
370
371 /* Return the maximum allowable size of a DMA transfer for a
372 * given buffer.
373 */
374 u32 (*dma_length_limit)(struct esp *esp, u32 dma_addr,
375 u32 dma_len);
376
377 /* Reset the DMA engine entirely. On return, ESP interrupts
378 * should be enabled. Often the interrupt enabling is
379 * controlled in the DMA engine.
380 */
381 void (*reset_dma)(struct esp *esp);
382
383 /* Drain any pending DMA in the DMA engine after a transfer.
384 * This is for writes to memory.
385 */
386 void (*dma_drain)(struct esp *esp);
387
388 /* Invalidate the DMA engine after a DMA transfer. */
389 void (*dma_invalidate)(struct esp *esp);
390
391 /* Setup an ESP command that will use a DMA transfer.
392 * The 'esp_count' specifies what transfer length should be
393 * programmed into the ESP transfer counter registers, whereas
394 * the 'dma_count' is the length that should be programmed into
395 * the DMA controller. Usually they are the same. If 'write'
396 * is non-zero, this transfer is a write into memory. 'cmd'
397 * holds the ESP command that should be issued by calling
398 * scsi_esp_cmd() at the appropriate time while programming
399 * the DMA hardware.
400 */
401 void (*send_dma_cmd)(struct esp *esp, u32 dma_addr, u32 esp_count,
402 u32 dma_count, int write, u8 cmd);
403
404 /* Return non-zero if the DMA engine is reporting an error
405 * currently.
406 */
407 int (*dma_error)(struct esp *esp);
408 };
409
410 #define ESP_MAX_MSG_SZ 8
411 #define ESP_EVENT_LOG_SZ 32
412
413 #define ESP_QUICKIRQ_LIMIT 100
414 #define ESP_RESELECT_TAG_LIMIT 2500
415
416 struct esp {
417 void __iomem *regs;
418 void __iomem *dma_regs;
419
420 const struct esp_driver_ops *ops;
421
422 struct Scsi_Host *host;
423 void *dev;
424
425 struct esp_cmd_entry *active_cmd;
426
427 struct list_head queued_cmds;
428 struct list_head active_cmds;
429
430 u8 *command_block;
431 dma_addr_t command_block_dma;
432
433 unsigned int data_dma_len;
434
435 /* The following are used to determine the cause of an IRQ. Upon every
436 * IRQ entry we synchronize these with the hardware registers.
437 */
438 u8 sreg;
439 u8 seqreg;
440 u8 sreg2;
441 u8 ireg;
442
443 u32 prev_hme_dmacsr;
444 u8 prev_soff;
445 u8 prev_stp;
446 u8 prev_cfg3;
447 u8 __pad;
448
449 struct list_head esp_cmd_pool;
450
451 struct esp_target_data target[ESP_MAX_TARGET];
452
453 int fifo_cnt;
454 u8 fifo[16];
455
456 struct esp_event_ent esp_event_log[ESP_EVENT_LOG_SZ];
457 int esp_event_cur;
458
459 u8 msg_out[ESP_MAX_MSG_SZ];
460 int msg_out_len;
461
462 u8 msg_in[ESP_MAX_MSG_SZ];
463 int msg_in_len;
464
465 u8 bursts;
466 u8 config1;
467 u8 config2;
468
469 u8 scsi_id;
470 u32 scsi_id_mask;
471
472 enum esp_rev rev;
473
474 u32 flags;
475 #define ESP_FLAG_DIFFERENTIAL 0x00000001
476 #define ESP_FLAG_RESETTING 0x00000002
477 #define ESP_FLAG_DOING_SLOWCMD 0x00000004
478 #define ESP_FLAG_WIDE_CAPABLE 0x00000008
479 #define ESP_FLAG_QUICKIRQ_CHECK 0x00000010
480 #define ESP_FLAG_DISABLE_SYNC 0x00000020
481
482 u8 select_state;
483 #define ESP_SELECT_NONE 0x00 /* Not selecting */
484 #define ESP_SELECT_BASIC 0x01 /* Select w/o MSGOUT phase */
485 #define ESP_SELECT_MSGOUT 0x02 /* Select with MSGOUT */
486
487 /* When we are not selecting, we are expecting an event. */
488 u8 event;
489 #define ESP_EVENT_NONE 0x00
490 #define ESP_EVENT_CMD_START 0x01
491 #define ESP_EVENT_CMD_DONE 0x02
492 #define ESP_EVENT_DATA_IN 0x03
493 #define ESP_EVENT_DATA_OUT 0x04
494 #define ESP_EVENT_DATA_DONE 0x05
495 #define ESP_EVENT_MSGIN 0x06
496 #define ESP_EVENT_MSGIN_MORE 0x07
497 #define ESP_EVENT_MSGIN_DONE 0x08
498 #define ESP_EVENT_MSGOUT 0x09
499 #define ESP_EVENT_MSGOUT_DONE 0x0a
500 #define ESP_EVENT_STATUS 0x0b
501 #define ESP_EVENT_FREE_BUS 0x0c
502 #define ESP_EVENT_CHECK_PHASE 0x0d
503 #define ESP_EVENT_RESET 0x10
504
505 /* Probed in esp_get_clock_params() */
506 u32 cfact;
507 u32 cfreq;
508 u32 ccycle;
509 u32 ctick;
510 u32 neg_defp;
511 u32 sync_defp;
512
513 /* Computed in esp_reset_esp() */
514 u32 max_period;
515 u32 min_period;
516 u32 radelay;
517
518 /* Slow command state. */
519 u8 *cmd_bytes_ptr;
520 int cmd_bytes_left;
521
522 struct completion *eh_reset;
523
524 void *dma;
525 int dmarev;
526 };
527
528 /* A front-end driver for the ESP chip should do the following in
529 * it's device probe routine:
530 * 1) Allocate the host and private area using scsi_host_alloc()
531 * with size 'sizeof(struct esp)'. The first argument to
532 * scsi_host_alloc() should be &scsi_esp_template.
533 * 2) Set host->max_id as appropriate.
534 * 3) Set esp->host to the scsi_host itself, and esp->dev
535 * to the device object pointer.
536 * 4) Hook up esp->ops to the front-end implementation.
537 * 5) If the ESP chip supports wide transfers, set ESP_FLAG_WIDE_CAPABLE
538 * in esp->flags.
539 * 6) Map the DMA and ESP chip registers.
540 * 7) DMA map the ESP command block, store the DMA address
541 * in esp->command_block_dma.
542 * 8) Register the scsi_esp_intr() interrupt handler.
543 * 9) Probe for and provide the following chip properties:
544 * esp->scsi_id (assign to esp->host->this_id too)
545 * esp->scsi_id_mask
546 * If ESP bus is differential, set ESP_FLAG_DIFFERENTIAL
547 * esp->cfreq
548 * DMA burst bit mask in esp->bursts, if necessary
549 * 10) Perform any actions necessary before the ESP device can
550 * be programmed for the first time. On some configs, for
551 * example, the DMA engine has to be reset before ESP can
552 * be programmed.
553 * 11) If necessary, call dev_set_drvdata() as needed.
554 * 12) Call scsi_esp_register() with prepared 'esp' structure
555 * and a device pointer if possible.
556 * 13) Check scsi_esp_register() return value, release all resources
557 * if an error was returned.
558 */
559 extern struct scsi_host_template scsi_esp_template;
560 extern int scsi_esp_register(struct esp *, struct device *);
561
562 extern void scsi_esp_unregister(struct esp *);
563 extern irqreturn_t scsi_esp_intr(int, void *);
564 extern void scsi_esp_cmd(struct esp *, u8);
565
566 #endif /* !(_ESP_SCSI_H) */
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