1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* esp_scsi.h: Defines and structures for the ESP driver. |
3 | * |
4 | * Copyright (C) 2007 David S. Miller (davem@davemloft.net) |
5 | */ |
6 | |
7 | #ifndef _ESP_SCSI_H |
8 | #define _ESP_SCSI_H |
9 | |
10 | /* Access Description Offset */ |
11 | #define ESP_TCLOW 0x00UL /* rw Low bits transfer count 0x00 */ |
12 | #define ESP_TCMED 0x01UL /* rw Mid bits transfer count 0x04 */ |
13 | #define ESP_FDATA 0x02UL /* rw FIFO data bits 0x08 */ |
14 | #define ESP_CMD 0x03UL /* rw SCSI command bits 0x0c */ |
15 | #define ESP_STATUS 0x04UL /* ro ESP status register 0x10 */ |
16 | #define ESP_BUSID ESP_STATUS /* wo BusID for sel/resel 0x10 */ |
17 | #define ESP_INTRPT 0x05UL /* ro Kind of interrupt 0x14 */ |
18 | #define ESP_TIMEO ESP_INTRPT /* wo Timeout for sel/resel 0x14 */ |
19 | #define ESP_SSTEP 0x06UL /* ro Sequence step register 0x18 */ |
20 | #define ESP_STP ESP_SSTEP /* wo Transfer period/sync 0x18 */ |
21 | #define ESP_FFLAGS 0x07UL /* ro Bits current FIFO info 0x1c */ |
22 | #define ESP_SOFF ESP_FFLAGS /* wo Sync offset 0x1c */ |
23 | #define ESP_CFG1 0x08UL /* rw First cfg register 0x20 */ |
24 | #define ESP_CFACT 0x09UL /* wo Clock conv factor 0x24 */ |
25 | #define ESP_STATUS2 ESP_CFACT /* ro HME status2 register 0x24 */ |
26 | #define ESP_CTEST 0x0aUL /* wo Chip test register 0x28 */ |
27 | #define ESP_CFG2 0x0bUL /* rw Second cfg register 0x2c */ |
28 | #define ESP_CFG3 0x0cUL /* rw Third cfg register 0x30 */ |
29 | #define ESP_CFG4 0x0dUL /* rw Fourth cfg register 0x34 */ |
30 | #define ESP_TCHI 0x0eUL /* rw High bits transf count 0x38 */ |
31 | #define ESP_UID ESP_TCHI /* ro Unique ID code 0x38 */ |
32 | #define FAS_RLO ESP_TCHI /* rw HME extended counter 0x38 */ |
33 | #define ESP_FGRND 0x0fUL /* rw Data base for fifo 0x3c */ |
34 | #define FAS_RHI ESP_FGRND /* rw HME extended counter 0x3c */ |
35 | |
36 | #define SBUS_ESP_REG_SIZE 0x40UL |
37 | |
38 | /* Bitfield meanings for the above registers. */ |
39 | |
40 | /* ESP config reg 1, read-write, found on all ESP chips */ |
41 | #define ESP_CONFIG1_ID 0x07 /* My BUS ID bits */ |
42 | #define ESP_CONFIG1_CHTEST 0x08 /* Enable ESP chip tests */ |
43 | #define ESP_CONFIG1_PENABLE 0x10 /* Enable parity checks */ |
44 | #define ESP_CONFIG1_PARTEST 0x20 /* Parity test mode enabled? */ |
45 | #define ESP_CONFIG1_SRRDISAB 0x40 /* Disable SCSI reset reports */ |
46 | #define ESP_CONFIG1_SLCABLE 0x80 /* Enable slow cable mode */ |
47 | |
48 | /* ESP config reg 2, read-write, found only on esp100a+esp200+esp236 chips */ |
49 | #define ESP_CONFIG2_DMAPARITY 0x01 /* enable DMA Parity (200,236) */ |
50 | #define ESP_CONFIG2_REGPARITY 0x02 /* enable reg Parity (200,236) */ |
51 | #define ESP_CONFIG2_BADPARITY 0x04 /* Bad parity target abort */ |
52 | #define ESP_CONFIG2_SCSI2ENAB 0x08 /* Enable SCSI-2 features (tgtmode) */ |
53 | #define ESP_CONFIG2_HI 0x10 /* High Impedance DREQ ??? */ |
54 | #define ESP_CONFIG2_HMEFENAB 0x10 /* HME features enable */ |
55 | #define ESP_CONFIG2_BCM 0x20 /* Enable byte-ctrl (236) */ |
56 | #define ESP_CONFIG2_DISPINT 0x20 /* Disable pause irq (hme) */ |
57 | #define ESP_CONFIG2_FENAB 0x40 /* Enable features (fas100,216) */ |
58 | #define ESP_CONFIG2_SPL 0x40 /* Enable status-phase latch (236) */ |
59 | #define ESP_CONFIG2_MKDONE 0x40 /* HME magic feature */ |
60 | #define ESP_CONFIG2_HME32 0x80 /* HME 32 extended */ |
61 | #define ESP_CONFIG2_MAGIC 0xe0 /* Invalid bits... */ |
62 | |
63 | /* ESP config register 3 read-write, found only esp236+fas236+fas100a+hme chips */ |
64 | #define ESP_CONFIG3_FCLOCK 0x01 /* FAST SCSI clock rate (esp100a/hme) */ |
65 | #define ESP_CONFIG3_TEM 0x01 /* Enable thresh-8 mode (esp/fas236) */ |
66 | #define ESP_CONFIG3_FAST 0x02 /* Enable FAST SCSI (esp100a/hme) */ |
67 | #define ESP_CONFIG3_ADMA 0x02 /* Enable alternate-dma (esp/fas236) */ |
68 | #define ESP_CONFIG3_TENB 0x04 /* group2 SCSI2 support (esp100a/hme) */ |
69 | #define ESP_CONFIG3_SRB 0x04 /* Save residual byte (esp/fas236) */ |
70 | #define ESP_CONFIG3_TMS 0x08 /* Three-byte msg's ok (esp100a/hme) */ |
71 | #define ESP_CONFIG3_FCLK 0x08 /* Fast SCSI clock rate (esp/fas236) */ |
72 | #define ESP_CONFIG3_IDMSG 0x10 /* ID message checking (esp100a/hme) */ |
73 | #define ESP_CONFIG3_FSCSI 0x10 /* Enable FAST SCSI (esp/fas236) */ |
74 | #define ESP_CONFIG3_GTM 0x20 /* group2 SCSI2 support (esp/fas236) */ |
75 | #define ESP_CONFIG3_IDBIT3 0x20 /* Bit 3 of HME SCSI-ID (hme) */ |
76 | #define ESP_CONFIG3_TBMS 0x40 /* Three-byte msg's ok (esp/fas236) */ |
77 | #define ESP_CONFIG3_EWIDE 0x40 /* Enable Wide-SCSI (hme) */ |
78 | #define ESP_CONFIG3_IMS 0x80 /* ID msg chk'ng (esp/fas236) */ |
79 | #define ESP_CONFIG3_OBPUSH 0x80 /* Push odd-byte to dma (hme) */ |
80 | |
81 | /* ESP config register 4 read-write */ |
82 | #define ESP_CONFIG4_BBTE 0x01 /* Back-to-back transfers (fsc) */ |
83 | #define ESP_CONGIG4_TEST 0x02 /* Transfer counter test mode (fsc) */ |
84 | #define ESP_CONFIG4_RADE 0x04 /* Active negation (am53c974/fsc) */ |
85 | #define ESP_CONFIG4_RAE 0x08 /* Act. negation REQ/ACK (am53c974) */ |
86 | #define ESP_CONFIG4_PWD 0x20 /* Reduced power feature (am53c974) */ |
87 | #define ESP_CONFIG4_GE0 0x40 /* Glitch eater bit 0 (am53c974) */ |
88 | #define ESP_CONFIG4_GE1 0x80 /* Glitch eater bit 1 (am53c974) */ |
89 | |
90 | #define ESP_CONFIG_GE_12NS (0) |
91 | #define ESP_CONFIG_GE_25NS (ESP_CONFIG_GE1) |
92 | #define ESP_CONFIG_GE_35NS (ESP_CONFIG_GE0) |
93 | #define ESP_CONFIG_GE_0NS (ESP_CONFIG_GE0 | ESP_CONFIG_GE1) |
94 | |
95 | /* ESP command register read-write */ |
96 | /* Group 1 commands: These may be sent at any point in time to the ESP |
97 | * chip. None of them can generate interrupts 'cept |
98 | * the "SCSI bus reset" command if you have not disabled |
99 | * SCSI reset interrupts in the config1 ESP register. |
100 | */ |
101 | #define ESP_CMD_NULL 0x00 /* Null command, ie. a nop */ |
102 | #define ESP_CMD_FLUSH 0x01 /* FIFO Flush */ |
103 | #define ESP_CMD_RC 0x02 /* Chip reset */ |
104 | #define ESP_CMD_RS 0x03 /* SCSI bus reset */ |
105 | |
106 | /* Group 2 commands: ESP must be an initiator and connected to a target |
107 | * for these commands to work. |
108 | */ |
109 | #define ESP_CMD_TI 0x10 /* Transfer Information */ |
110 | #define ESP_CMD_ICCSEQ 0x11 /* Initiator cmd complete sequence */ |
111 | #define ESP_CMD_MOK 0x12 /* Message okie-dokie */ |
112 | #define ESP_CMD_TPAD 0x18 /* Transfer Pad */ |
113 | #define ESP_CMD_SATN 0x1a /* Set ATN */ |
114 | #define ESP_CMD_RATN 0x1b /* De-assert ATN */ |
115 | |
116 | /* Group 3 commands: ESP must be in the MSGOUT or MSGIN state and be connected |
117 | * to a target as the initiator for these commands to work. |
118 | */ |
119 | #define ESP_CMD_SMSG 0x20 /* Send message */ |
120 | #define ESP_CMD_SSTAT 0x21 /* Send status */ |
121 | #define ESP_CMD_SDATA 0x22 /* Send data */ |
122 | #define ESP_CMD_DSEQ 0x23 /* Discontinue Sequence */ |
123 | #define ESP_CMD_TSEQ 0x24 /* Terminate Sequence */ |
124 | #define ESP_CMD_TCCSEQ 0x25 /* Target cmd cmplt sequence */ |
125 | #define ESP_CMD_DCNCT 0x27 /* Disconnect */ |
126 | #define ESP_CMD_RMSG 0x28 /* Receive Message */ |
127 | #define ESP_CMD_RCMD 0x29 /* Receive Command */ |
128 | #define ESP_CMD_RDATA 0x2a /* Receive Data */ |
129 | #define ESP_CMD_RCSEQ 0x2b /* Receive cmd sequence */ |
130 | |
131 | /* Group 4 commands: The ESP must be in the disconnected state and must |
132 | * not be connected to any targets as initiator for |
133 | * these commands to work. |
134 | */ |
135 | #define ESP_CMD_RSEL 0x40 /* Reselect */ |
136 | #define ESP_CMD_SEL 0x41 /* Select w/o ATN */ |
137 | #define ESP_CMD_SELA 0x42 /* Select w/ATN */ |
138 | #define ESP_CMD_SELAS 0x43 /* Select w/ATN & STOP */ |
139 | #define ESP_CMD_ESEL 0x44 /* Enable selection */ |
140 | #define ESP_CMD_DSEL 0x45 /* Disable selections */ |
141 | #define ESP_CMD_SA3 0x46 /* Select w/ATN3 */ |
142 | #define ESP_CMD_RSEL3 0x47 /* Reselect3 */ |
143 | |
144 | /* This bit enables the ESP's DMA on the SBus */ |
145 | #define ESP_CMD_DMA 0x80 /* Do DMA? */ |
146 | |
147 | /* ESP status register read-only */ |
148 | #define ESP_STAT_PIO 0x01 /* IO phase bit */ |
149 | #define ESP_STAT_PCD 0x02 /* CD phase bit */ |
150 | #define ESP_STAT_PMSG 0x04 /* MSG phase bit */ |
151 | #define ESP_STAT_PMASK 0x07 /* Mask of phase bits */ |
152 | #define ESP_STAT_TDONE 0x08 /* Transfer Completed */ |
153 | #define ESP_STAT_TCNT 0x10 /* Transfer Counter Is Zero */ |
154 | #define ESP_STAT_PERR 0x20 /* Parity error */ |
155 | #define ESP_STAT_SPAM 0x40 /* Real bad error */ |
156 | /* This indicates the 'interrupt pending' condition on esp236, it is a reserved |
157 | * bit on other revs of the ESP. |
158 | */ |
159 | #define ESP_STAT_INTR 0x80 /* Interrupt */ |
160 | |
161 | /* The status register can be masked with ESP_STAT_PMASK and compared |
162 | * with the following values to determine the current phase the ESP |
163 | * (at least thinks it) is in. For our purposes we also add our own |
164 | * software 'done' bit for our phase management engine. |
165 | */ |
166 | #define ESP_DOP (0) /* Data Out */ |
167 | #define ESP_DIP (ESP_STAT_PIO) /* Data In */ |
168 | #define ESP_CMDP (ESP_STAT_PCD) /* Command */ |
169 | #define ESP_STATP (ESP_STAT_PCD|ESP_STAT_PIO) /* Status */ |
170 | #define ESP_MOP (ESP_STAT_PMSG|ESP_STAT_PCD) /* Message Out */ |
171 | #define ESP_MIP (ESP_STAT_PMSG|ESP_STAT_PCD|ESP_STAT_PIO) /* Message In */ |
172 | |
173 | /* HME only: status 2 register */ |
174 | #define ESP_STAT2_SCHBIT 0x01 /* Upper bits 3-7 of sstep enabled */ |
175 | #define ESP_STAT2_FFLAGS 0x02 /* The fifo flags are now latched */ |
176 | #define ESP_STAT2_XCNT 0x04 /* The transfer counter is latched */ |
177 | #define ESP_STAT2_CREGA 0x08 /* The command reg is active now */ |
178 | #define ESP_STAT2_WIDE 0x10 /* Interface on this adapter is wide */ |
179 | #define ESP_STAT2_F1BYTE 0x20 /* There is one byte at top of fifo */ |
180 | #define ESP_STAT2_FMSB 0x40 /* Next byte in fifo is most significant */ |
181 | #define ESP_STAT2_FEMPTY 0x80 /* FIFO is empty */ |
182 | |
183 | /* ESP interrupt register read-only */ |
184 | #define ESP_INTR_S 0x01 /* Select w/o ATN */ |
185 | #define ESP_INTR_SATN 0x02 /* Select w/ATN */ |
186 | #define ESP_INTR_RSEL 0x04 /* Reselected */ |
187 | #define ESP_INTR_FDONE 0x08 /* Function done */ |
188 | #define ESP_INTR_BSERV 0x10 /* Bus service */ |
189 | #define ESP_INTR_DC 0x20 /* Disconnect */ |
190 | #define ESP_INTR_IC 0x40 /* Illegal command given */ |
191 | #define ESP_INTR_SR 0x80 /* SCSI bus reset detected */ |
192 | |
193 | /* ESP sequence step register read-only */ |
194 | #define ESP_STEP_VBITS 0x07 /* Valid bits */ |
195 | #define ESP_STEP_ASEL 0x00 /* Selection&Arbitrate cmplt */ |
196 | #define ESP_STEP_SID 0x01 /* One msg byte sent */ |
197 | #define ESP_STEP_NCMD 0x02 /* Was not in command phase */ |
198 | #define ESP_STEP_PPC 0x03 /* Early phase chg caused cmnd |
199 | * bytes to be lost |
200 | */ |
201 | #define ESP_STEP_FINI4 0x04 /* Command was sent ok */ |
202 | |
203 | /* Ho hum, some ESP's set the step register to this as well... */ |
204 | #define ESP_STEP_FINI5 0x05 |
205 | #define ESP_STEP_FINI6 0x06 |
206 | #define ESP_STEP_FINI7 0x07 |
207 | |
208 | /* ESP chip-test register read-write */ |
209 | #define ESP_TEST_TARG 0x01 /* Target test mode */ |
210 | #define ESP_TEST_INI 0x02 /* Initiator test mode */ |
211 | #define ESP_TEST_TS 0x04 /* Tristate test mode */ |
212 | |
213 | /* ESP unique ID register read-only, found on fas236+fas100a only */ |
214 | #define ESP_UID_FAM 0xf8 /* ESP family bitmask */ |
215 | |
216 | #define ESP_FAMILY(uid) (((uid) & ESP_UID_FAM) >> 3) |
217 | |
218 | /* Values for the ESP family bits */ |
219 | #define ESP_UID_F100A 0x00 /* ESP FAS100A */ |
220 | #define ESP_UID_F236 0x02 /* ESP FAS236 */ |
221 | #define ESP_UID_HME 0x0a /* FAS HME */ |
222 | #define ESP_UID_FSC 0x14 /* NCR/Symbios Logic 53CF9x-2 */ |
223 | |
224 | /* ESP fifo flags register read-only */ |
225 | /* Note that the following implies a 16 byte FIFO on the ESP. */ |
226 | #define ESP_FF_FBYTES 0x1f /* Num bytes in FIFO */ |
227 | #define ESP_FF_ONOTZERO 0x20 /* offset ctr not zero (esp100) */ |
228 | #define ESP_FF_SSTEP 0xe0 /* Sequence step */ |
229 | |
230 | /* ESP clock conversion factor register write-only */ |
231 | #define ESP_CCF_F0 0x00 /* 35.01MHz - 40MHz */ |
232 | #define ESP_CCF_NEVER 0x01 /* Set it to this and die */ |
233 | #define ESP_CCF_F2 0x02 /* 10MHz */ |
234 | #define ESP_CCF_F3 0x03 /* 10.01MHz - 15MHz */ |
235 | #define ESP_CCF_F4 0x04 /* 15.01MHz - 20MHz */ |
236 | #define ESP_CCF_F5 0x05 /* 20.01MHz - 25MHz */ |
237 | #define ESP_CCF_F6 0x06 /* 25.01MHz - 30MHz */ |
238 | #define ESP_CCF_F7 0x07 /* 30.01MHz - 35MHz */ |
239 | |
240 | /* HME only... */ |
241 | #define ESP_BUSID_RESELID 0x10 |
242 | #define ESP_BUSID_CTR32BIT 0x40 |
243 | |
244 | #define ESP_BUS_TIMEOUT 250 /* In milli-seconds */ |
245 | #define ESP_TIMEO_CONST 8192 |
246 | #define ESP_NEG_DEFP(mhz, cfact) \ |
247 | ((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (8192 * (cfact))) |
248 | #define ESP_HZ_TO_CYCLE(hertz) ((1000000000) / ((hertz) / 1000)) |
249 | #define ESP_TICK(ccf, cycle) ((7682 * (ccf) * (cycle) / 1000)) |
250 | |
251 | /* For slow to medium speed input clock rates we shoot for 5mb/s, but for high |
252 | * input clock rates we try to do 10mb/s although I don't think a transfer can |
253 | * even run that fast with an ESP even with DMA2 scatter gather pipelining. |
254 | */ |
255 | #define SYNC_DEFP_SLOW 0x32 /* 5mb/s */ |
256 | #define SYNC_DEFP_FAST 0x19 /* 10mb/s */ |
257 | |
258 | struct esp_cmd_priv { |
259 | int num_sg; |
260 | int cur_residue; |
261 | struct scatterlist *prv_sg; |
262 | struct scatterlist *cur_sg; |
263 | int tot_residue; |
264 | }; |
265 | |
266 | #define ESP_CMD_PRIV(cmd) ((struct esp_cmd_priv *)scsi_cmd_priv(cmd)) |
267 | |
268 | /* NOTE: this enum is ordered based on chip features! */ |
269 | enum esp_rev { |
270 | ESP100, /* NCR53C90 - very broken */ |
271 | ESP100A, /* NCR53C90A */ |
272 | ESP236, |
273 | FAS236, |
274 | PCSCSI, /* AM53c974 */ |
275 | FSC, /* NCR/Symbios Logic 53CF9x-2 */ |
276 | FAS100A, |
277 | FAST, |
278 | FASHME, |
279 | }; |
280 | |
281 | struct esp_cmd_entry { |
282 | struct list_head list; |
283 | |
284 | struct scsi_cmnd *cmd; |
285 | |
286 | unsigned int saved_cur_residue; |
287 | struct scatterlist *saved_prv_sg; |
288 | struct scatterlist *saved_cur_sg; |
289 | unsigned int saved_tot_residue; |
290 | |
291 | u8 flags; |
292 | #define ESP_CMD_FLAG_WRITE 0x01 /* DMA is a write */ |
293 | #define ESP_CMD_FLAG_AUTOSENSE 0x04 /* Doing automatic REQUEST_SENSE */ |
294 | #define ESP_CMD_FLAG_RESIDUAL 0x08 /* AM53c974 BLAST residual */ |
295 | |
296 | u8 tag[2]; |
297 | u8 orig_tag[2]; |
298 | |
299 | u8 status; |
300 | u8 message; |
301 | |
302 | unsigned char *sense_ptr; |
303 | unsigned char *saved_sense_ptr; |
304 | dma_addr_t sense_dma; |
305 | |
306 | struct completion *eh_done; |
307 | }; |
308 | |
309 | #define ESP_DEFAULT_TAGS 16 |
310 | |
311 | #define ESP_MAX_TARGET 16 |
312 | #define ESP_MAX_LUN 8 |
313 | #define ESP_MAX_TAG 256 |
314 | |
315 | struct esp_lun_data { |
316 | struct esp_cmd_entry *non_tagged_cmd; |
317 | int num_tagged; |
318 | int hold; |
319 | struct esp_cmd_entry *tagged_cmds[ESP_MAX_TAG]; |
320 | }; |
321 | |
322 | struct esp_target_data { |
323 | /* These are the ESP_STP, ESP_SOFF, and ESP_CFG3 register values which |
324 | * match the currently negotiated settings for this target. The SCSI |
325 | * protocol values are maintained in spi_{offset,period,wide}(starget). |
326 | */ |
327 | u8 esp_period; |
328 | u8 esp_offset; |
329 | u8 esp_config3; |
330 | |
331 | u8 flags; |
332 | #define ESP_TGT_WIDE 0x01 |
333 | #define ESP_TGT_DISCONNECT 0x02 |
334 | #define ESP_TGT_NEGO_WIDE 0x04 |
335 | #define ESP_TGT_NEGO_SYNC 0x08 |
336 | #define ESP_TGT_CHECK_NEGO 0x40 |
337 | #define ESP_TGT_BROKEN 0x80 |
338 | |
339 | /* When ESP_TGT_CHECK_NEGO is set, on the next scsi command to this |
340 | * device we will try to negotiate the following parameters. |
341 | */ |
342 | u8 nego_goal_period; |
343 | u8 nego_goal_offset; |
344 | u8 nego_goal_width; |
345 | u8 nego_goal_tags; |
346 | |
347 | struct scsi_target *starget; |
348 | }; |
349 | |
350 | struct esp_event_ent { |
351 | u8 type; |
352 | #define ESP_EVENT_TYPE_EVENT 0x01 |
353 | #define ESP_EVENT_TYPE_CMD 0x02 |
354 | u8 val; |
355 | |
356 | u8 sreg; |
357 | u8 seqreg; |
358 | u8 sreg2; |
359 | u8 ireg; |
360 | u8 select_state; |
361 | u8 event; |
362 | u8 __pad; |
363 | }; |
364 | |
365 | struct esp; |
366 | struct esp_driver_ops { |
367 | /* Read and write the ESP 8-bit registers. On some |
368 | * applications of the ESP chip the registers are at 4-byte |
369 | * instead of 1-byte intervals. |
370 | */ |
371 | void (*esp_write8)(struct esp *esp, u8 val, unsigned long reg); |
372 | u8 (*esp_read8)(struct esp *esp, unsigned long reg); |
373 | |
374 | /* Return non-zero if there is an IRQ pending. Usually this |
375 | * status bit lives in the DMA controller sitting in front of |
376 | * the ESP. This has to be accurate or else the ESP interrupt |
377 | * handler will not run. |
378 | */ |
379 | int (*irq_pending)(struct esp *esp); |
380 | |
381 | /* Return the maximum allowable size of a DMA transfer for a |
382 | * given buffer. |
383 | */ |
384 | u32 (*dma_length_limit)(struct esp *esp, u32 dma_addr, |
385 | u32 dma_len); |
386 | |
387 | /* Reset the DMA engine entirely. On return, ESP interrupts |
388 | * should be enabled. Often the interrupt enabling is |
389 | * controlled in the DMA engine. |
390 | */ |
391 | void (*reset_dma)(struct esp *esp); |
392 | |
393 | /* Drain any pending DMA in the DMA engine after a transfer. |
394 | * This is for writes to memory. |
395 | */ |
396 | void (*dma_drain)(struct esp *esp); |
397 | |
398 | /* Invalidate the DMA engine after a DMA transfer. */ |
399 | void (*dma_invalidate)(struct esp *esp); |
400 | |
401 | /* Setup an ESP command that will use a DMA transfer. |
402 | * The 'esp_count' specifies what transfer length should be |
403 | * programmed into the ESP transfer counter registers, whereas |
404 | * the 'dma_count' is the length that should be programmed into |
405 | * the DMA controller. Usually they are the same. If 'write' |
406 | * is non-zero, this transfer is a write into memory. 'cmd' |
407 | * holds the ESP command that should be issued by calling |
408 | * scsi_esp_cmd() at the appropriate time while programming |
409 | * the DMA hardware. |
410 | */ |
411 | void (*send_dma_cmd)(struct esp *esp, u32 dma_addr, u32 esp_count, |
412 | u32 dma_count, int write, u8 cmd); |
413 | |
414 | /* Return non-zero if the DMA engine is reporting an error |
415 | * currently. |
416 | */ |
417 | int (*dma_error)(struct esp *esp); |
418 | }; |
419 | |
420 | #define ESP_MAX_MSG_SZ 8 |
421 | #define ESP_EVENT_LOG_SZ 32 |
422 | |
423 | #define ESP_QUICKIRQ_LIMIT 100 |
424 | #define ESP_RESELECT_TAG_LIMIT 2500 |
425 | |
426 | struct esp { |
427 | void __iomem *regs; |
428 | void __iomem *dma_regs; |
429 | |
430 | const struct esp_driver_ops *ops; |
431 | |
432 | struct Scsi_Host *host; |
433 | struct device *dev; |
434 | |
435 | struct esp_cmd_entry *active_cmd; |
436 | |
437 | struct list_head queued_cmds; |
438 | struct list_head active_cmds; |
439 | |
440 | u8 *command_block; |
441 | dma_addr_t command_block_dma; |
442 | |
443 | unsigned int data_dma_len; |
444 | |
445 | /* The following are used to determine the cause of an IRQ. Upon every |
446 | * IRQ entry we synchronize these with the hardware registers. |
447 | */ |
448 | u8 sreg; |
449 | u8 seqreg; |
450 | u8 sreg2; |
451 | u8 ireg; |
452 | |
453 | u32 prev_hme_dmacsr; |
454 | u8 prev_soff; |
455 | u8 prev_stp; |
456 | u8 prev_cfg3; |
457 | u8 num_tags; |
458 | |
459 | struct list_head esp_cmd_pool; |
460 | |
461 | struct esp_target_data target[ESP_MAX_TARGET]; |
462 | |
463 | int fifo_cnt; |
464 | u8 fifo[16]; |
465 | |
466 | struct esp_event_ent esp_event_log[ESP_EVENT_LOG_SZ]; |
467 | int esp_event_cur; |
468 | |
469 | u8 msg_out[ESP_MAX_MSG_SZ]; |
470 | int msg_out_len; |
471 | |
472 | u8 msg_in[ESP_MAX_MSG_SZ]; |
473 | int msg_in_len; |
474 | |
475 | u8 bursts; |
476 | u8 config1; |
477 | u8 config2; |
478 | u8 config4; |
479 | |
480 | u8 scsi_id; |
481 | u32 scsi_id_mask; |
482 | |
483 | enum esp_rev rev; |
484 | |
485 | u32 flags; |
486 | #define ESP_FLAG_DIFFERENTIAL 0x00000001 |
487 | #define ESP_FLAG_RESETTING 0x00000002 |
488 | #define ESP_FLAG_WIDE_CAPABLE 0x00000008 |
489 | #define ESP_FLAG_QUICKIRQ_CHECK 0x00000010 |
490 | #define ESP_FLAG_DISABLE_SYNC 0x00000020 |
491 | #define ESP_FLAG_USE_FIFO 0x00000040 |
492 | #define ESP_FLAG_NO_DMA_MAP 0x00000080 |
493 | |
494 | u8 select_state; |
495 | #define ESP_SELECT_NONE 0x00 /* Not selecting */ |
496 | #define ESP_SELECT_BASIC 0x01 /* Select w/o MSGOUT phase */ |
497 | #define ESP_SELECT_MSGOUT 0x02 /* Select with MSGOUT */ |
498 | |
499 | /* When we are not selecting, we are expecting an event. */ |
500 | u8 event; |
501 | #define ESP_EVENT_NONE 0x00 |
502 | #define ESP_EVENT_CMD_START 0x01 |
503 | #define ESP_EVENT_CMD_DONE 0x02 |
504 | #define ESP_EVENT_DATA_IN 0x03 |
505 | #define ESP_EVENT_DATA_OUT 0x04 |
506 | #define ESP_EVENT_DATA_DONE 0x05 |
507 | #define ESP_EVENT_MSGIN 0x06 |
508 | #define ESP_EVENT_MSGIN_MORE 0x07 |
509 | #define ESP_EVENT_MSGIN_DONE 0x08 |
510 | #define ESP_EVENT_MSGOUT 0x09 |
511 | #define ESP_EVENT_MSGOUT_DONE 0x0a |
512 | #define ESP_EVENT_STATUS 0x0b |
513 | #define ESP_EVENT_FREE_BUS 0x0c |
514 | #define ESP_EVENT_CHECK_PHASE 0x0d |
515 | #define ESP_EVENT_RESET 0x10 |
516 | |
517 | /* Probed in esp_get_clock_params() */ |
518 | u32 cfact; |
519 | u32 cfreq; |
520 | u32 ccycle; |
521 | u32 ctick; |
522 | u32 neg_defp; |
523 | u32 sync_defp; |
524 | |
525 | /* Computed in esp_reset_esp() */ |
526 | u32 max_period; |
527 | u32 min_period; |
528 | u32 radelay; |
529 | |
530 | /* ESP_CMD_SELAS command state */ |
531 | u8 *cmd_bytes_ptr; |
532 | int cmd_bytes_left; |
533 | |
534 | struct completion *eh_reset; |
535 | |
536 | void *dma; |
537 | int dmarev; |
538 | |
539 | /* These are used by esp_send_pio_cmd() */ |
540 | u8 __iomem *fifo_reg; |
541 | int send_cmd_error; |
542 | u32 send_cmd_residual; |
543 | }; |
544 | |
545 | /* A front-end driver for the ESP chip should do the following in |
546 | * it's device probe routine: |
547 | * 1) Allocate the host and private area using scsi_host_alloc() |
548 | * with size 'sizeof(struct esp)'. The first argument to |
549 | * scsi_host_alloc() should be &scsi_esp_template. |
550 | * 2) Set host->max_id as appropriate. |
551 | * 3) Set esp->host to the scsi_host itself, and esp->dev |
552 | * to the device object pointer. |
553 | * 4) Hook up esp->ops to the front-end implementation. |
554 | * 5) If the ESP chip supports wide transfers, set ESP_FLAG_WIDE_CAPABLE |
555 | * in esp->flags. |
556 | * 6) Map the DMA and ESP chip registers. |
557 | * 7) DMA map the ESP command block, store the DMA address |
558 | * in esp->command_block_dma. |
559 | * 8) Register the scsi_esp_intr() interrupt handler. |
560 | * 9) Probe for and provide the following chip properties: |
561 | * esp->scsi_id (assign to esp->host->this_id too) |
562 | * esp->scsi_id_mask |
563 | * If ESP bus is differential, set ESP_FLAG_DIFFERENTIAL |
564 | * esp->cfreq |
565 | * DMA burst bit mask in esp->bursts, if necessary |
566 | * 10) Perform any actions necessary before the ESP device can |
567 | * be programmed for the first time. On some configs, for |
568 | * example, the DMA engine has to be reset before ESP can |
569 | * be programmed. |
570 | * 11) If necessary, call dev_set_drvdata() as needed. |
571 | * 12) Call scsi_esp_register() with prepared 'esp' structure. |
572 | * 13) Check scsi_esp_register() return value, release all resources |
573 | * if an error was returned. |
574 | */ |
575 | extern const struct scsi_host_template scsi_esp_template; |
576 | extern int scsi_esp_register(struct esp *); |
577 | |
578 | extern void scsi_esp_unregister(struct esp *); |
579 | extern irqreturn_t scsi_esp_intr(int, void *); |
580 | extern void scsi_esp_cmd(struct esp *, u8); |
581 | |
582 | extern void esp_send_pio_cmd(struct esp *esp, u32 dma_addr, u32 esp_count, |
583 | u32 dma_count, int write, u8 cmd); |
584 | |
585 | #endif /* !(_ESP_SCSI_H) */ |
586 | |