1 /* $Id: esp.h,v 1.28 2000/03/30 01:33:17 davem Exp $
2 * esp.h: Defines and structures for the Sparc ESP (Enhanced SCSI
3 * Processor) driver under Linux.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8 #ifndef _SPARC_ESP_H
9 #define _SPARC_ESP_H
10
11 /* For dvma controller register definitions. */
12 #include <asm/dma.h>
13
14 /* The ESP SCSI controllers have their register sets in three
15 * "classes":
16 *
17 * 1) Registers which are both read and write.
18 * 2) Registers which are read only.
19 * 3) Registers which are write only.
20 *
21 * Yet, they all live within the same IO space.
22 */
23
24 /* All the ESP registers are one byte each and are accessed longwords
25 * apart with a big-endian ordering to the bytes.
26 */
27 /* Access Description Offset */
28 #define ESP_TCLOW 0x00UL /* rw Low bits of the transfer count 0x00 */
29 #define ESP_TCMED 0x04UL /* rw Mid bits of the transfer count 0x04 */
30 #define ESP_FDATA 0x08UL /* rw FIFO data bits 0x08 */
31 #define ESP_CMD 0x0cUL /* rw SCSI command bits 0x0c */
32 #define ESP_STATUS 0x10UL /* ro ESP status register 0x10 */
33 #define ESP_BUSID ESP_STATUS /* wo Bus ID for select/reselect 0x10 */
34 #define ESP_INTRPT 0x14UL /* ro Kind of interrupt 0x14 */
35 #define ESP_TIMEO ESP_INTRPT /* wo Timeout value for select/resel 0x14 */
36 #define ESP_SSTEP 0x18UL /* ro Sequence step register 0x18 */
37 #define ESP_STP ESP_SSTEP /* wo Transfer period per sync 0x18 */
38 #define ESP_FFLAGS 0x1cUL /* ro Bits of current FIFO info 0x1c */
39 #define ESP_SOFF ESP_FFLAGS /* wo Sync offset 0x1c */
40 #define ESP_CFG1 0x20UL /* rw First configuration register 0x20 */
41 #define ESP_CFACT 0x24UL /* wo Clock conversion factor 0x24 */
42 #define ESP_STATUS2 ESP_CFACT /* ro HME status2 register 0x24 */
43 #define ESP_CTEST 0x28UL /* wo Chip test register 0x28 */
44 #define ESP_CFG2 0x2cUL /* rw Second configuration register 0x2c */
45 #define ESP_CFG3 0x30UL /* rw Third configuration register 0x30 */
46 #define ESP_TCHI 0x38UL /* rw High bits of transfer count 0x38 */
47 #define ESP_UID ESP_TCHI /* ro Unique ID code 0x38 */
48 #define FAS_RLO ESP_TCHI /* rw HME extended counter 0x38 */
49 #define ESP_FGRND 0x3cUL /* rw Data base for fifo 0x3c */
50 #define FAS_RHI ESP_FGRND /* rw HME extended counter 0x3c */
51 #define ESP_REG_SIZE 0x40UL
52
53 /* Various revisions of the ESP board. */
54 enum esp_rev {
55 esp100 = 0x00, /* NCR53C90 - very broken */
56 esp100a = 0x01, /* NCR53C90A */
57 esp236 = 0x02,
58 fas236 = 0x03,
59 fas100a = 0x04,
60 fast = 0x05,
61 fashme = 0x06,
62 espunknown = 0x07
63 };
64
65 /* We get one of these for each ESP probed. */
66 struct esp {
67 spinlock_t lock;
68 unsigned long eregs; /* ESP controller registers */
69 unsigned long dregs; /* DMA controller registers */
70 struct sbus_dma *dma; /* DMA controller sw state */
71 struct Scsi_Host *ehost; /* Backpointer to SCSI Host */
72 struct sbus_dev *sdev; /* Pointer to SBus entry */
73
74 /* ESP Configuration Registers */
75 u8 config1; /* Copy of the 1st config register */
76 u8 config2; /* Copy of the 2nd config register */
77 u8 config3[16]; /* Copy of the 3rd config register */
78
79 /* The current command we are sending to the ESP chip. This esp_command
80 * ptr needs to be mapped in DVMA area so we can send commands and read
81 * from the ESP fifo without burning precious CPU cycles. Programmed I/O
82 * sucks when we have the DVMA to do it for us. The ESP is stupid and will
83 * only send out 6, 10, and 12 byte SCSI commands, others we need to send
84 * one byte at a time. esp_slowcmd being set says that we are doing one
85 * of the command types ESP doesn't understand, esp_scmdp keeps track of
86 * which byte we are sending, esp_scmdleft says how many bytes to go.
87 */
88 volatile u8 *esp_command; /* Location of command (CPU view) */
89 __u32 esp_command_dvma;/* Location of command (DVMA view) */
90 unsigned char esp_clen; /* Length of this command */
91 unsigned char esp_slowcmd;
92 unsigned char *esp_scmdp;
93 unsigned char esp_scmdleft;
94
95 /* The following are used to determine the cause of an IRQ. Upon every
96 * IRQ entry we synchronize these with the hardware registers.
97 */
98 u8 ireg; /* Copy of ESP interrupt register */
99 u8 sreg; /* Copy of ESP status register */
100 u8 seqreg; /* Copy of ESP sequence step register */
101 u8 sreg2; /* Copy of HME status2 register */
102
103 /* To save register writes to the ESP, which can be expensive, we
104 * keep track of the previous value that various registers had for
105 * the last target we connected to. If they are the same for the
106 * current target, we skip the register writes as they are not needed.
107 */
108 u8 prev_soff, prev_stp;
109 u8 prev_cfg3, __cache_pad;
110
111 /* We also keep a cache of the previous FAS/HME DMA CSR register value. */
112 u32 prev_hme_dmacsr;
113
114 /* The HME is the biggest piece of shit I have ever seen. */
115 u8 hme_fifo_workaround_buffer[16 * 2];
116 u8 hme_fifo_workaround_count;
117
118 /* For each target we keep track of save/restore data
119 * pointer information. This needs to be updated majorly
120 * when we add support for tagged queueing. -DaveM
121 */
122 struct esp_pointers {
123 char *saved_ptr;
124 struct scatterlist *saved_buffer;
125 int saved_this_residual;
126 int saved_buffers_residual;
127 } data_pointers[16] /*XXX [MAX_TAGS_PER_TARGET]*/;
128
129 /* Clock periods, frequencies, synchronization, etc. */
130 unsigned int cfreq; /* Clock frequency in HZ */
131 unsigned int cfact; /* Clock conversion factor */
132 unsigned int raw_cfact; /* Raw copy from probing */
133 unsigned int ccycle; /* One ESP clock cycle */
134 unsigned int ctick; /* One ESP clock time */
135 unsigned int radelay; /* FAST chip req/ack delay */
136 unsigned int neg_defp; /* Default negotiation period */
137 unsigned int sync_defp; /* Default sync transfer period */
138 unsigned int max_period; /* longest our period can be */
139 unsigned int min_period; /* shortest period we can withstand */
140
141 struct esp *next; /* Next ESP we probed or NULL */
142 char prom_name[64]; /* Name of ESP device from prom */
143 int prom_node; /* Prom node where ESP found */
144 int esp_id; /* Unique per-ESP ID number */
145
146 /* For slow to medium speed input clock rates we shoot for 5mb/s,
147 * but for high input clock rates we try to do 10mb/s although I
148 * don't think a transfer can even run that fast with an ESP even
149 * with DMA2 scatter gather pipelining.
150 */
151 #define SYNC_DEFP_SLOW 0x32 /* 5mb/s */
152 #define SYNC_DEFP_FAST 0x19 /* 10mb/s */
153
154 unsigned int snip; /* Sync. negotiation in progress */
155 unsigned int wnip; /* WIDE negotiation in progress */
156 unsigned int targets_present;/* targets spoken to before */
157
158 int current_transfer_size; /* Set at beginning of data dma */
159
160 u8 espcmdlog[32]; /* Log of current esp cmds sent. */
161 u8 espcmdent; /* Current entry in esp cmd log. */
162
163 /* Misc. info about this ESP */
164 enum esp_rev erev; /* ESP revision */
165 int irq; /* SBus IRQ for this ESP */
166 int scsi_id; /* Who am I as initiator? */
167 int scsi_id_mask; /* Bitmask of 'me'. */
168 int diff; /* Differential SCSI bus? */
169 int bursts; /* Burst sizes our DVMA supports */
170
171 /* Our command queues, only one cmd lives in the current_SC queue. */
172 Scsi_Cmnd *issue_SC; /* Commands to be issued */
173 Scsi_Cmnd *current_SC; /* Who is currently working the bus */
174 Scsi_Cmnd *disconnected_SC;/* Commands disconnected from the bus */
175
176 /* Message goo */
177 u8 cur_msgout[16];
178 u8 cur_msgin[16];
179 u8 prevmsgout, prevmsgin;
180 u8 msgout_len, msgin_len;
181 u8 msgout_ctr, msgin_ctr;
182
183 /* States that we cannot keep in the per cmd structure because they
184 * cannot be assosciated with any specific command.
185 */
186 u8 resetting_bus;
187 };
188
189 /* Bitfield meanings for the above registers. */
190
191 /* ESP config reg 1, read-write, found on all ESP chips */
192 #define ESP_CONFIG1_ID 0x07 /* My BUS ID bits */
193 #define ESP_CONFIG1_CHTEST 0x08 /* Enable ESP chip tests */
194 #define ESP_CONFIG1_PENABLE 0x10 /* Enable parity checks */
195 #define ESP_CONFIG1_PARTEST 0x20 /* Parity test mode enabled? */
196 #define ESP_CONFIG1_SRRDISAB 0x40 /* Disable SCSI reset reports */
197 #define ESP_CONFIG1_SLCABLE 0x80 /* Enable slow cable mode */
198
199 /* ESP config reg 2, read-write, found only on esp100a+esp200+esp236 chips */
200 #define ESP_CONFIG2_DMAPARITY 0x01 /* enable DMA Parity (200,236) */
201 #define ESP_CONFIG2_REGPARITY 0x02 /* enable reg Parity (200,236) */
202 #define ESP_CONFIG2_BADPARITY 0x04 /* Bad parity target abort */
203 #define ESP_CONFIG2_SCSI2ENAB 0x08 /* Enable SCSI-2 features (tmode only) */
204 #define ESP_CONFIG2_HI 0x10 /* High Impedance DREQ ??? */
205 #define ESP_CONFIG2_HMEFENAB 0x10 /* HME features enable */
206 #define ESP_CONFIG2_BCM 0x20 /* Enable byte-ctrl (236) */
207 #define ESP_CONFIG2_DISPINT 0x20 /* Disable pause irq (hme) */
208 #define ESP_CONFIG2_FENAB 0x40 /* Enable features (fas100,esp216) */
209 #define ESP_CONFIG2_SPL 0x40 /* Enable status-phase latch (esp236) */
210 #define ESP_CONFIG2_MKDONE 0x40 /* HME magic feature */
211 #define ESP_CONFIG2_HME32 0x80 /* HME 32 extended */
212 #define ESP_CONFIG2_MAGIC 0xe0 /* Invalid bits... */
213
214 /* ESP config register 3 read-write, found only esp236+fas236+fas100a+hme chips */
215 #define ESP_CONFIG3_FCLOCK 0x01 /* FAST SCSI clock rate (esp100a/hme) */
216 #define ESP_CONFIG3_TEM 0x01 /* Enable thresh-8 mode (esp/fas236) */
217 #define ESP_CONFIG3_FAST 0x02 /* Enable FAST SCSI (esp100a/hme) */
218 #define ESP_CONFIG3_ADMA 0x02 /* Enable alternate-dma (esp/fas236) */
219 #define ESP_CONFIG3_TENB 0x04 /* group2 SCSI2 support (esp100a/hme) */
220 #define ESP_CONFIG3_SRB 0x04 /* Save residual byte (esp/fas236) */
221 #define ESP_CONFIG3_TMS 0x08 /* Three-byte msg's ok (esp100a/hme) */
222 #define ESP_CONFIG3_FCLK 0x08 /* Fast SCSI clock rate (esp/fas236) */
223 #define ESP_CONFIG3_IDMSG 0x10 /* ID message checking (esp100a/hme) */
224 #define ESP_CONFIG3_FSCSI 0x10 /* Enable FAST SCSI (esp/fas236) */
225 #define ESP_CONFIG3_GTM 0x20 /* group2 SCSI2 support (esp/fas236) */
226 #define ESP_CONFIG3_IDBIT3 0x20 /* Bit 3 of HME SCSI-ID (hme) */
227 #define ESP_CONFIG3_TBMS 0x40 /* Three-byte msg's ok (esp/fas236) */
228 #define ESP_CONFIG3_EWIDE 0x40 /* Enable Wide-SCSI (hme) */
229 #define ESP_CONFIG3_IMS 0x80 /* ID msg chk'ng (esp/fas236) */
230 #define ESP_CONFIG3_OBPUSH 0x80 /* Push odd-byte to dma (hme) */
231
232 /* ESP command register read-write */
233 /* Group 1 commands: These may be sent at any point in time to the ESP
234 * chip. None of them can generate interrupts 'cept
235 * the "SCSI bus reset" command if you have not disabled
236 * SCSI reset interrupts in the config1 ESP register.
237 */
238 #define ESP_CMD_NULL 0x00 /* Null command, ie. a nop */
239 #define ESP_CMD_FLUSH 0x01 /* FIFO Flush */
240 #define ESP_CMD_RC 0x02 /* Chip reset */
241 #define ESP_CMD_RS 0x03 /* SCSI bus reset */
242
243 /* Group 2 commands: ESP must be an initiator and connected to a target
244 * for these commands to work.
245 */
246 #define ESP_CMD_TI 0x10 /* Transfer Information */
247 #define ESP_CMD_ICCSEQ 0x11 /* Initiator cmd complete sequence */
248 #define ESP_CMD_MOK 0x12 /* Message okie-dokie */
249 #define ESP_CMD_TPAD 0x18 /* Transfer Pad */
250 #define ESP_CMD_SATN 0x1a /* Set ATN */
251 #define ESP_CMD_RATN 0x1b /* De-assert ATN */
252
253 /* Group 3 commands: ESP must be in the MSGOUT or MSGIN state and be connected
254 * to a target as the initiator for these commands to work.
255 */
256 #define ESP_CMD_SMSG 0x20 /* Send message */
257 #define ESP_CMD_SSTAT 0x21 /* Send status */
258 #define ESP_CMD_SDATA 0x22 /* Send data */
259 #define ESP_CMD_DSEQ 0x23 /* Discontinue Sequence */
260 #define ESP_CMD_TSEQ 0x24 /* Terminate Sequence */
261 #define ESP_CMD_TCCSEQ 0x25 /* Target cmd cmplt sequence */
262 #define ESP_CMD_DCNCT 0x27 /* Disconnect */
263 #define ESP_CMD_RMSG 0x28 /* Receive Message */
264 #define ESP_CMD_RCMD 0x29 /* Receive Command */
265 #define ESP_CMD_RDATA 0x2a /* Receive Data */
266 #define ESP_CMD_RCSEQ 0x2b /* Receive cmd sequence */
267
268 /* Group 4 commands: The ESP must be in the disconnected state and must
269 * not be connected to any targets as initiator for
270 * these commands to work.
271 */
272 #define ESP_CMD_RSEL 0x40 /* Reselect */
273 #define ESP_CMD_SEL 0x41 /* Select w/o ATN */
274 #define ESP_CMD_SELA 0x42 /* Select w/ATN */
275 #define ESP_CMD_SELAS 0x43 /* Select w/ATN & STOP */
276 #define ESP_CMD_ESEL 0x44 /* Enable selection */
277 #define ESP_CMD_DSEL 0x45 /* Disable selections */
278 #define ESP_CMD_SA3 0x46 /* Select w/ATN3 */
279 #define ESP_CMD_RSEL3 0x47 /* Reselect3 */
280
281 /* This bit enables the ESP's DMA on the SBus */
282 #define ESP_CMD_DMA 0x80 /* Do DMA? */
283
284
285 /* ESP status register read-only */
286 #define ESP_STAT_PIO 0x01 /* IO phase bit */
287 #define ESP_STAT_PCD 0x02 /* CD phase bit */
288 #define ESP_STAT_PMSG 0x04 /* MSG phase bit */
289 #define ESP_STAT_PMASK 0x07 /* Mask of phase bits */
290 #define ESP_STAT_TDONE 0x08 /* Transfer Completed */
291 #define ESP_STAT_TCNT 0x10 /* Transfer Counter Is Zero */
292 #define ESP_STAT_PERR 0x20 /* Parity error */
293 #define ESP_STAT_SPAM 0x40 /* Real bad error */
294 /* This indicates the 'interrupt pending' condition on esp236, it is a reserved
295 * bit on other revs of the ESP.
296 */
297 #define ESP_STAT_INTR 0x80 /* Interrupt */
298
299 /* HME only: status 2 register */
300 #define ESP_STAT2_SCHBIT 0x01 /* Upper bits 3-7 of sstep enabled */
301 #define ESP_STAT2_FFLAGS 0x02 /* The fifo flags are now latched */
302 #define ESP_STAT2_XCNT 0x04 /* The transfer counter is latched */
303 #define ESP_STAT2_CREGA 0x08 /* The command reg is active now */
304 #define ESP_STAT2_WIDE 0x10 /* Interface on this adapter is wide */
305 #define ESP_STAT2_F1BYTE 0x20 /* There is one byte at top of fifo */
306 #define ESP_STAT2_FMSB 0x40 /* Next byte in fifo is most significant */
307 #define ESP_STAT2_FEMPTY 0x80 /* FIFO is empty */
308
309 /* The status register can be masked with ESP_STAT_PMASK and compared
310 * with the following values to determine the current phase the ESP
311 * (at least thinks it) is in. For our purposes we also add our own
312 * software 'done' bit for our phase management engine.
313 */
314 #define ESP_DOP (0) /* Data Out */
315 #define ESP_DIP (ESP_STAT_PIO) /* Data In */
316 #define ESP_CMDP (ESP_STAT_PCD) /* Command */
317 #define ESP_STATP (ESP_STAT_PCD|ESP_STAT_PIO) /* Status */
318 #define ESP_MOP (ESP_STAT_PMSG|ESP_STAT_PCD) /* Message Out */
319 #define ESP_MIP (ESP_STAT_PMSG|ESP_STAT_PCD|ESP_STAT_PIO) /* Message In */
320
321 /* ESP interrupt register read-only */
322 #define ESP_INTR_S 0x01 /* Select w/o ATN */
323 #define ESP_INTR_SATN 0x02 /* Select w/ATN */
324 #define ESP_INTR_RSEL 0x04 /* Reselected */
325 #define ESP_INTR_FDONE 0x08 /* Function done */
326 #define ESP_INTR_BSERV 0x10 /* Bus service */
327 #define ESP_INTR_DC 0x20 /* Disconnect */
328 #define ESP_INTR_IC 0x40 /* Illegal command given */
329 #define ESP_INTR_SR 0x80 /* SCSI bus reset detected */
330
331 /* Interrupt status macros */
332 #define ESP_SRESET_IRQ(esp) ((esp)->intreg & (ESP_INTR_SR))
333 #define ESP_ILLCMD_IRQ(esp) ((esp)->intreg & (ESP_INTR_IC))
334 #define ESP_SELECT_WITH_ATN_IRQ(esp) ((esp)->intreg & (ESP_INTR_SATN))
335 #define ESP_SELECT_WITHOUT_ATN_IRQ(esp) ((esp)->intreg & (ESP_INTR_S))
336 #define ESP_SELECTION_IRQ(esp) ((ESP_SELECT_WITH_ATN_IRQ(esp)) || \
337 (ESP_SELECT_WITHOUT_ATN_IRQ(esp)))
338 #define ESP_RESELECTION_IRQ(esp) ((esp)->intreg & (ESP_INTR_RSEL))
339
340 /* ESP sequence step register read-only */
341 #define ESP_STEP_VBITS 0x07 /* Valid bits */
342 #define ESP_STEP_ASEL 0x00 /* Selection&Arbitrate cmplt */
343 #define ESP_STEP_SID 0x01 /* One msg byte sent */
344 #define ESP_STEP_NCMD 0x02 /* Was not in command phase */
345 #define ESP_STEP_PPC 0x03 /* Early phase chg caused cmnd
346 * bytes to be lost
347 */
348 #define ESP_STEP_FINI4 0x04 /* Command was sent ok */
349
350 /* Ho hum, some ESP's set the step register to this as well... */
351 #define ESP_STEP_FINI5 0x05
352 #define ESP_STEP_FINI6 0x06
353 #define ESP_STEP_FINI7 0x07
354
355 /* ESP chip-test register read-write */
356 #define ESP_TEST_TARG 0x01 /* Target test mode */
357 #define ESP_TEST_INI 0x02 /* Initiator test mode */
358 #define ESP_TEST_TS 0x04 /* Tristate test mode */
359
360 /* ESP unique ID register read-only, found on fas236+fas100a only */
361 #define ESP_UID_F100A 0x00 /* ESP FAS100A */
362 #define ESP_UID_F236 0x02 /* ESP FAS236 */
363 #define ESP_UID_REV 0x07 /* ESP revision */
364 #define ESP_UID_FAM 0xf8 /* ESP family */
365
366 /* ESP fifo flags register read-only */
367 /* Note that the following implies a 16 byte FIFO on the ESP. */
368 #define ESP_FF_FBYTES 0x1f /* Num bytes in FIFO */
369 #define ESP_FF_ONOTZERO 0x20 /* offset ctr not zero (esp100) */
370 #define ESP_FF_SSTEP 0xe0 /* Sequence step */
371
372 /* ESP clock conversion factor register write-only */
373 #define ESP_CCF_F0 0x00 /* 35.01MHz - 40MHz */
374 #define ESP_CCF_NEVER 0x01 /* Set it to this and die */
375 #define ESP_CCF_F2 0x02 /* 10MHz */
376 #define ESP_CCF_F3 0x03 /* 10.01MHz - 15MHz */
377 #define ESP_CCF_F4 0x04 /* 15.01MHz - 20MHz */
378 #define ESP_CCF_F5 0x05 /* 20.01MHz - 25MHz */
379 #define ESP_CCF_F6 0x06 /* 25.01MHz - 30MHz */
380 #define ESP_CCF_F7 0x07 /* 30.01MHz - 35MHz */
381
382 /* HME only... */
383 #define ESP_BUSID_RESELID 0x10
384 #define ESP_BUSID_CTR32BIT 0x40
385
386 #define ESP_BUS_TIMEOUT 275 /* In milli-seconds */
387 #define ESP_TIMEO_CONST 8192
388 #define ESP_NEG_DEFP(mhz, cfact) \
389 ((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (8192 * (cfact)))
390 #define ESP_MHZ_TO_CYCLE(mhertz) ((1000000000) / ((mhertz) / 1000))
391 #define ESP_TICK(ccf, cycle) ((7682 * (ccf) * (cycle) / 1000))
392
393 extern int esp_detect(struct SHT *);
394 extern const char *esp_info(struct Scsi_Host *);
395 extern int esp_queue(Scsi_Cmnd *, void (*done)(Scsi_Cmnd *));
396 extern int esp_command(Scsi_Cmnd *);
397 extern int esp_abort(Scsi_Cmnd *);
398 extern int esp_reset(Scsi_Cmnd *, unsigned int);
399 extern int esp_proc_info(char *buffer, char **start, off_t offset, int length,
400 int hostno, int inout);
401 extern int esp_revoke(Scsi_Device* SDptr);
402
403 #define SCSI_SPARC_ESP { \
404 proc_name: "esp", \
405 proc_info: &esp_proc_info, \
406 name: "Sun ESP 100/100a/200", \
407 detect: esp_detect, \
408 revoke: esp_revoke, \
409 info: esp_info, \
410 command: esp_command, \
411 queuecommand: esp_queue, \
412 abort: esp_abort, \
413 reset: esp_reset, \
414 can_queue: 7, \
415 this_id: 7, \
416 sg_tablesize: SG_ALL, \
417 cmd_per_lun: 1, \
418 use_clustering: ENABLE_CLUSTERING, \
419 use_new_eh_code: 0 \
420 }
421
422 /* For our interrupt engine. */
423 #define for_each_esp(esp) \
424 for((esp) = espchain; (esp); (esp) = (esp)->next)
425
426 #endif /* !(_SPARC_ESP_H) */
427
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