1 #include <linux/config.h>
2 #include <linux/module.h>
3 #include <linux/delay.h>
4 #include <linux/signal.h>
5 #include <linux/sched.h>
6 #include <linux/errno.h>
8 #include <linux/string.h>
10 #include <linux/init.h>
11 #include <linux/spinlock.h>
14 #include <asm/system.h>
19 #include "constants.h"
22 /* AM53/79C974 (PCscsi) driver release 0.5
24 * The architecture and much of the code of this device
25 * driver was originally developed by Drew Eckhardt for
26 * the NCR5380. The following copyrights apply:
27 * For the architecture and all pieces of code which can also be found
28 * in the NCR5380 device driver:
29 * Copyright 1993, Drew Eckhardt
31 * (Unix and Linux consulting and custom programming)
35 * The AM53C974_nobios_detect code was originally developed by
36 * Robin Cutshaw (robin@xfree86.org) and is used here in a
37 * slightly modified form.
39 * PCI detection rewritten by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
41 * For the remaining code:
42 * Copyright 1994, D. Frieauff
43 * EMail: fri@rsx42sun0.dofn.de
44 * Phone: x49-7545-8-2256 , x49-7541-42305
48 * $Log: AM53C974.c,v $
53 #ifdef AM53C974_DEBUG_KEYWAIT
54 #define KEYWAIT() AM53C974_keywait()
58 #ifdef AM53C974_DEBUG_INIT
63 #ifdef AM53C974_DEBUG_MSG
68 #ifdef AM53C974_DEB_RESEL
69 #define DEB_RESEL(x) x
73 #ifdef AM53C974_DEBUG_QUEUE
74 #define DEB_QUEUE(x) x
75 #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
76 #define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); }
80 #define REMOVE(w,x,y,z)
82 #ifdef AM53C974_DEBUG_INFO
87 #ifdef AM53C974_DEBUG_LINKED
88 #define DEB_LINKED(x) x
92 #ifdef AM53C974_DEBUG_INTR
102 #define REMOVE(w,x,y,z)
104 #define DEB_LINKED(x)
110 #ifdef AM53C974_DEBUG_ABORT
111 #define DEB_ABORT(x) x
116 #ifdef VERBOSE_AM53C974_DEBUG
122 #define INSIDE(x,l,h) ( ((x) >= (l)) && ((x) <= (h)) )
125 #include <scsi/scsicam.h>
127 /***************************************************************************************
128 * Default setting of the controller's SCSI id. Edit and uncomment this only if your *
129 * BIOS does not correctly initialize the controller's SCSI id. *
130 * If you don't get a warning during boot, it is correctly initialized. *
131 ****************************************************************************************/
132 /* #define AM53C974_SCSI_ID 7 */
134 /***************************************************************************************
135 * Default settings for sync. negotiation enable, transfer rate and sync. offset. *
136 * These settings can be replaced by LILO overrides (append) with the following syntax: *
137 * AM53C974=host-scsi-id, target-scsi-id, max-rate, max-offset *
138 * Sync. negotiation is disabled by default and will be enabled for those targets which *
139 * are specified in the LILO override *
140 ****************************************************************************************/
141 #define DEFAULT_SYNC_NEGOTIATION_ENABLED 0 /* 0 or 1 */
142 #define DEFAULT_RATE 5 /* MHz, min: 3; max: 10 */
143 #define DEFAULT_SYNC_OFFSET 0 /* bytes, min: 0; max: 15; use 0 for async. mode */
145 /***************************************************************************************
146 * If defined, don't allow targets to disconnect during commands. This will reduce *
147 * performance, but may be worthwhile if you suspect the driver of corrupting data when *
148 * a disconnect happens. *
149 ***************************************************************************************/
150 #define AM53C974_PROHIBIT_DISCONNECT
152 /* --------------------- don't edit below here --------------------- */
154 #define AM53C974_DRIVER_REVISION_MAJOR 0
155 #define AM53C974_DRIVER_REVISION_MINOR 5
156 #define SEPARATOR_LINE \
157 "--------------------------------------------------------------------------\n"
160 /* #define AM53C974_DEBUG */
161 /* #define AM53C974_DEBUG_MSG */
162 /* #define AM53C974_DEBUG_KEYWAIT */
163 /* #define AM53C974_DEBUG_INIT */
164 /* #define AM53C974_DEBUG_QUEUE */
165 /* #define AM53C974_DEBUG_INFO */
166 /* #define AM53C974_DEBUG_LINKED */
167 /* #define VERBOSE_AM53C974_DEBUG */
168 /* #define AM53C974_DEBUG_INTR */
169 /* #define AM53C974_DEB_RESEL */
170 #define AM53C974_DEBUG_ABORT
171 /* #define AM53C974_OPTION_DEBUG_PROBE_ONLY */
173 /* special options/constants */
174 #define DEF_CLK 40 /* chip clock freq. in MHz */
175 #define MIN_PERIOD 4 /* for negotiation: min. number of clocks per cycle */
176 #define MAX_PERIOD 13 /* for negotiation: max. number of clocks per cycle */
177 #define MAX_OFFSET 15 /* for negotiation: max. offset (0=async) */
179 #define DEF_SCSI_TIMEOUT 245 /* STIMREG value, 40 Mhz */
180 #define DEF_STP 8 /* STPREG value assuming 5.0 MB/sec, FASTCLK, FASTSCSI */
181 #define DEF_SOF_RAD 0 /* REQ/ACK deassertion delay */
182 #define DEF_SOF_RAA 0 /* REQ/ACK assertion delay */
183 #define DEF_ETM 0 /* CNTLREG1, ext. timing mode */
184 #define DEF_PERE 1 /* CNTLREG1, parity error reporting */
185 #define DEF_CLKF 0 /* CLKFREG, 0=40 Mhz */
186 #define DEF_ENF 1 /* CNTLREG2, enable features */
187 #define DEF_ADIDCHK 0 /* CNTLREG3, additional ID check */
188 #define DEF_FASTSCSI 1 /* CNTLREG3, fast SCSI */
189 #define DEF_FASTCLK 1 /* CNTLREG3, fast clocking, 5 MB/sec at 40MHz chip clk */
190 #define DEF_GLITCH 1 /* CNTLREG4, glitch eater, 0=12ns, 1=35ns, 2=25ns, 3=off */
191 #define DEF_PWD 0 /* CNTLREG4, reduced power feature */
192 #define DEF_RAE 0 /* CNTLREG4, RAE active negation on REQ, ACK only */
193 #define DEF_RADE 1 /* 1CNTLREG4, active negation on REQ, ACK and data */
196 #define CTCLREG 0x00 /* r current transf. count, low byte */
197 #define CTCMREG 0x04 /* r current transf. count, middle byte */
198 #define CTCHREG 0x38 /* r current transf. count, high byte */
199 #define STCLREG 0x00 /* w start transf. count, low byte */
200 #define STCMREG 0x04 /* w start transf. count, middle byte */
201 #define STCHREG 0x38 /* w start transf. count, high byte */
202 #define FFREG 0x08 /* rw SCSI FIFO reg. */
203 #define STIMREG 0x14 /* w SCSI timeout reg. */
205 #define SDIDREG 0x10 /* w SCSI destination ID reg. */
206 #define SDIREG_MASK 0x07 /* mask */
208 #define STPREG 0x18 /* w synchronous transf. period reg. */
209 #define STPREG_STP 0x1F /* synchr. transfer period */
211 #define CLKFREG 0x24 /* w clock factor reg. */
212 #define CLKFREG_MASK 0x07 /* mask */
214 #define CMDREG 0x0C /* rw SCSI command reg. */
215 #define CMDREG_DMA 0x80 /* set DMA mode (set together with opcodes below) */
216 #define CMDREG_IT 0x10 /* information transfer */
217 #define CMDREG_ICCS 0x11 /* initiator command complete steps */
218 #define CMDREG_MA 0x12 /* message accepted */
219 #define CMDREG_TPB 0x98 /* transfer pad bytes, DMA mode only */
220 #define CMDREG_SATN 0x1A /* set ATN */
221 #define CMDREG_RATN 0x1B /* reset ATN */
222 #define CMDREG_SOAS 0x41 /* select without ATN steps */
223 #define CMDREG_SAS 0x42 /* select with ATN steps (1 msg byte) */
224 #define CMDREG_SASS 0x43 /* select with ATN and stop steps */
225 #define CMDREG_ESR 0x44 /* enable selection/reselection */
226 #define CMDREG_DSR 0x45 /* disable selection/reselection */
227 #define CMDREG_SA3S 0x46 /* select with ATN 3 steps (3 msg bytes) */
228 #define CMDREG_NOP 0x00 /* no operation */
229 #define CMDREG_CFIFO 0x01 /* clear FIFO */
230 #define CMDREG_RDEV 0x02 /* reset device */
231 #define CMDREG_RBUS 0x03 /* reset SCSI bus */
233 #define STATREG 0x10 /* r SCSI status reg. */
234 #define STATREG_INT 0x80 /* SCSI interrupt condition detected */
235 #define STATREG_IOE 0x40 /* SCSI illegal operation error detected */
236 #define STATREG_PE 0x20 /* SCSI parity error detected */
237 #define STATREG_CTZ 0x10 /* CTC reg decremented to zero */
238 #define STATREG_MSG 0x04 /* SCSI MSG phase (latched?) */
239 #define STATREG_CD 0x02 /* SCSI C/D phase (latched?) */
240 #define STATREG_IO 0x01 /* SCSI I/O phase (latched?) */
241 #define STATREG_PHASE 0x07 /* SCSI phase mask */
243 #define INSTREG 0x14 /* r interrupt status reg. */
244 #define INSTREG_SRST 0x80 /* SCSI reset detected */
245 #define INSTREG_ICMD 0x40 /* SCSI invalid command detected */
246 #define INSTREG_DIS 0x20 /* target disconnected or sel/resel timeout */
247 #define INSTREG_SR 0x10 /* device on bus has service request */
248 #define INSTREG_SO 0x08 /* successful operation */
249 #define INSTREG_RESEL 0x04 /* device reselected as initiator */
251 #define ISREG 0x18 /* r internal state reg. */
252 #define ISREG_SOF 0x08 /* synchronous offset flag (act. low) */
253 #define ISREG_IS 0x07 /* status of intermediate op. */
254 #define ISREG_OK_NO_STOP 0x04 /* selection successful */
255 #define ISREG_OK_STOP 0x01 /* selection successful */
257 #define CFIREG 0x1C /* r current FIFO/internal state reg. */
258 #define CFIREG_IS 0xE0 /* status of intermediate op. */
259 #define CFIREG_CF 0x1F /* number of bytes in SCSI FIFO */
261 #define SOFREG 0x1C /* w synchr. offset reg. */
262 #define SOFREG_RAD 0xC0 /* REQ/ACK deassertion delay (sync.) */
263 #define SOFREG_RAA 0x30 /* REQ/ACK assertion delay (sync.) */
264 #define SOFREG_SO 0x0F /* synch. offset (sync.) */
266 #define CNTLREG1 0x20 /* rw control register one */
267 #define CNTLREG1_ETM 0x80 /* set extended timing mode */
268 #define CNTLREG1_DISR 0x40 /* disable interrupt on SCSI reset */
269 #define CNTLREG1_PERE 0x10 /* enable parity error reporting */
270 #define CNTLREG1_SID 0x07 /* host adapter SCSI ID */
272 #define CNTLREG2 0x2C /* rw control register two */
273 #define CNTLREG2_ENF 0x40 /* enable features */
275 #define CNTLREG3 0x30 /* rw control register three */
276 #define CNTLREG3_ADIDCHK 0x80 /* additional ID check */
277 #define CNTLREG3_FASTSCSI 0x10 /* fast SCSI */
278 #define CNTLREG3_FASTCLK 0x08 /* fast SCSI clocking */
280 #define CNTLREG4 0x34 /* rw control register four */
281 #define CNTLREG4_GLITCH 0xC0 /* glitch eater */
282 #define CNTLREG4_PWD 0x20 /* reduced power feature */
283 #define CNTLREG4_RAE 0x08 /* write only, active negot. ctrl. */
284 #define CNTLREG4_RADE 0x04 /* active negot. ctrl. */
285 #define CNTLREG4_RES 0x10 /* reserved bit, must be 1 */
288 #define DMACMD 0x40 /* rw command */
289 #define DMACMD_DIR 0x80 /* transfer direction (1=read from device) */
290 #define DMACMD_INTE_D 0x40 /* DMA transfer interrupt enable */
291 #define DMACMD_INTE_P 0x20 /* page transfer interrupt enable */
292 #define DMACMD_MDL 0x10 /* map to memory descriptor list */
293 #define DMACMD_DIAG 0x04 /* diagnostics, set to 0 */
294 #define DMACMD_IDLE 0x00 /* idle cmd */
295 #define DMACMD_BLAST 0x01 /* flush FIFO to memory */
296 #define DMACMD_ABORT 0x02 /* terminate DMA */
297 #define DMACMD_START 0x03 /* start DMA */
299 #define DMASTATUS 0x54 /* r status register */
300 #define DMASTATUS_BCMPLT 0x20 /* BLAST complete */
301 #define DMASTATUS_SCSIINT 0x10 /* SCSI interrupt pending */
302 #define DMASTATUS_DONE 0x08 /* DMA transfer terminated */
303 #define DMASTATUS_ABORT 0x04 /* DMA transfer aborted */
304 #define DMASTATUS_ERROR 0x02 /* DMA transfer error */
305 #define DMASTATUS_PWDN 0x02 /* power down indicator */
307 #define DMASTC 0x44 /* rw starting transfer count */
308 #define DMASPA 0x48 /* rw starting physical address */
309 #define DMAWBC 0x4C /* r working byte counter */
310 #define DMAWAC 0x50 /* r working address counter */
311 #define DMASMDLA 0x58 /* rw starting MDL address */
312 #define DMAWMAC 0x5C /* r working MDL counter */
314 /*** SCSI phases ***/
315 #define PHASE_MSGIN 0x07
316 #define PHASE_MSGOUT 0x06
317 #define PHASE_RES_1 0x05
318 #define PHASE_RES_0 0x04
319 #define PHASE_STATIN 0x03
320 #define PHASE_CMDOUT 0x02
321 #define PHASE_DATAIN 0x01
322 #define PHASE_DATAOUT 0x00
325 #define AM53C974_local_declare() unsigned long io_port
326 #define AM53C974_setio(instance) io_port = instance->io_port
327 #define AM53C974_read_8(addr) inb(io_port + (addr))
328 #define AM53C974_write_8(addr,x) outb((x), io_port + (addr))
329 #define AM53C974_read_16(addr) inw(io_port + (addr))
330 #define AM53C974_write_16(addr,x) outw((x), io_port + (addr))
331 #define AM53C974_read_32(addr) inl(io_port + (addr))
332 #define AM53C974_write_32(addr,x) outl((x), io_port + (addr))
334 #define AM53C974_poll_int() { do { statreg = AM53C974_read_8(STATREG); } \
335 while (!(statreg & STATREG_INT)) ; \
336 AM53C974_read_8(INSTREG) ; } /* clear int */
337 #define AM53C974_cfifo() (AM53C974_read_8(CFIREG) & CFIREG_CF)
339 /* These are "special" values for the tag parameter passed to AM53C974_select. */
340 #define TAG_NEXT -1 /* Use next free tag */
341 #define TAG_NONE -2 /* Establish I_T_L nexus instead of I_T_L_Q
342 * even on SCSI-II devices */
344 /************ LILO overrides *************/
345 typedef struct _override_t
{
346 int host_scsi_id
; /* SCSI id of the bus controller */
347 int target_scsi_id
; /* SCSI id of target */
348 int max_rate
; /* max. transfer rate */
349 int max_offset
; /* max. sync. offset, 0 = asynchronous */
353 #ifdef AM53C974_DEBUG
354 static void AM53C974_print_phase(struct Scsi_Host
*instance
);
355 static void AM53C974_print_queues(struct Scsi_Host
*instance
);
356 #endif /* AM53C974_DEBUG */
357 static void AM53C974_print(struct Scsi_Host
*instance
);
358 static void AM53C974_keywait(void);
359 static __inline__
int AM53C974_pci_detect(Scsi_Host_Template
* tpnt
);
360 static int AM53C974_init(Scsi_Host_Template
* tpnt
, struct pci_dev
*pdev
);
361 static void AM53C974_config_after_reset(struct Scsi_Host
*instance
);
362 static __inline__
void initialize_SCp(Scsi_Cmnd
* cmd
);
363 static __inline__
void run_main(void);
364 static void AM53C974_main(void);
365 static void AM53C974_intr(int irq
, void *dev_id
, struct pt_regs
*regs
);
366 static void do_AM53C974_intr(int irq
, void *dev_id
, struct pt_regs
*regs
);
367 static void AM53C974_intr_disconnect(struct Scsi_Host
*instance
);
368 static int AM53C974_sync_neg(struct Scsi_Host
*instance
, int target
, unsigned char *msg
);
369 static __inline__
void AM53C974_set_async(struct Scsi_Host
*instance
, int target
);
370 static __inline__
void AM53C974_set_sync(struct Scsi_Host
*instance
, int target
);
371 static void AM53C974_information_transfer(struct Scsi_Host
*instance
,
372 unsigned char statreg
, unsigned char isreg
,
373 unsigned char instreg
, unsigned char cfifo
,
374 unsigned char dmastatus
);
375 static int AM53C974_message(struct Scsi_Host
*instance
, Scsi_Cmnd
* cmd
, unsigned char msg
);
376 static void AM53C974_select(struct Scsi_Host
*instance
, Scsi_Cmnd
* cmd
, int tag
);
377 static void AM53C974_intr_reselect(struct Scsi_Host
*instance
, unsigned char statreg
);
378 static __inline__
void AM53C974_transfer_dma(struct Scsi_Host
*instance
, short dir
,
379 unsigned long length
, char *data
);
380 static void AM53C974_dma_blast(struct Scsi_Host
*instance
, unsigned char dmastatus
,
381 unsigned char statreg
);
382 static void AM53C974_intr_bus_reset(struct Scsi_Host
*instance
);
384 static struct Scsi_Host
*first_instance
= NULL
;
385 static Scsi_Host_Template
*the_template
= NULL
;
386 static struct Scsi_Host
*first_host
= NULL
; /* Head of list of AMD boards */
387 static volatile int main_running
= 0;
388 static int commandline_current
= 0;
389 override_t overrides
[7] =
391 {-1, 0, 0, 0},}; /* LILO overrides */
393 struct proc_dir_entry proc_scsi_am53c974
=
395 PROC_SCSI_AM53C974
, 8, "am53c974",
396 S_IFDIR
| S_IRUGO
| S_IXUGO
, 2
399 #ifdef AM53C974_DEBUG
400 static int deb_stop
= 1;
408 PHASE_DATAOUT
, "DATAOUT"
410 PHASE_DATAIN
, "DATAIN"
412 PHASE_CMDOUT
, "CMDOUT"
415 PHASE_STATIN
, "STATIN"
417 PHASE_MSGOUT
, "MSGOUT"
422 PHASE_RES_0
, "RESERVED 0"
424 PHASE_RES_1
, "RESERVED 1"
428 /**************************************************************************
429 * Function : void AM53C974_print_phase(struct Scsi_Host *instance)
431 * Purpose : print the current SCSI phase for debugging purposes
433 * Input : instance - which AM53C974
434 **************************************************************************/
435 static void AM53C974_print_phase(struct Scsi_Host
*instance
)
437 AM53C974_local_declare();
438 unsigned char statreg
, latched
;
440 AM53C974_setio(instance
);
442 latched
= (AM53C974_read_8(CNTLREG2
)) & CNTLREG2_ENF
;
443 statreg
= AM53C974_read_8(STATREG
);
444 for (i
= 0; (phases
[i
].value
!= PHASE_RES_1
) &&
445 (phases
[i
].value
!= (statreg
& STATREG_PHASE
)); ++i
);
447 printk("scsi%d : phase %s, latched at end of last command\n", instance
->host_no
, phases
[i
].name
);
449 printk("scsi%d : phase %s, real time\n", instance
->host_no
, phases
[i
].name
);
452 /**************************************************************************
453 * Function : void AM53C974_print_queues(struct Scsi_Host *instance)
455 * Purpose : print commands in the various queues
457 * Inputs : instance - which AM53C974
458 **************************************************************************/
459 static void AM53C974_print_queues(struct Scsi_Host
*instance
)
462 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
465 printk("AM53C974: coroutine is%s running.\n", main_running
? "" : "n't");
470 if (!hostdata
->connected
) {
471 printk("scsi%d: no currently connected command\n", instance
->host_no
);
473 print_Scsi_Cmnd((Scsi_Cmnd
*) hostdata
->connected
);
475 if (!hostdata
->sel_cmd
) {
476 printk("scsi%d: no currently arbitrating command\n", instance
->host_no
);
478 print_Scsi_Cmnd((Scsi_Cmnd
*) hostdata
->sel_cmd
);
481 printk("scsi%d: issue_queue ", instance
->host_no
);
482 if (!hostdata
->issue_queue
)
486 for (ptr
= (Scsi_Cmnd
*) hostdata
->issue_queue
; ptr
; ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
487 print_Scsi_Cmnd(ptr
);
490 printk("scsi%d: disconnected_queue ", instance
->host_no
);
491 if (!hostdata
->disconnected_queue
)
495 for (ptr
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; ptr
; ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
496 print_Scsi_Cmnd(ptr
);
499 restore_flags(flags
);
502 #endif /* AM53C974_DEBUG */
504 /**************************************************************************
505 * Function : void AM53C974_print(struct Scsi_Host *instance)
507 * Purpose : dump the chip registers for debugging purposes
509 * Input : instance - which AM53C974
510 **************************************************************************/
511 static void AM53C974_print(struct Scsi_Host
*instance
)
513 AM53C974_local_declare();
515 unsigned long ctcreg
, dmastc
, dmaspa
, dmawbc
, dmawac
;
516 unsigned char cmdreg
, statreg
, isreg
, cfireg
, cntlreg
[4], dmacmd
,
518 AM53C974_setio(instance
);
522 ctcreg
= AM53C974_read_8(CTCHREG
) << 16;
523 ctcreg
|= AM53C974_read_8(CTCMREG
) << 8;
524 ctcreg
|= AM53C974_read_8(CTCLREG
);
525 cmdreg
= AM53C974_read_8(CMDREG
);
526 statreg
= AM53C974_read_8(STATREG
);
527 isreg
= AM53C974_read_8(ISREG
);
528 cfireg
= AM53C974_read_8(CFIREG
);
529 cntlreg
[0] = AM53C974_read_8(CNTLREG1
);
530 cntlreg
[1] = AM53C974_read_8(CNTLREG2
);
531 cntlreg
[2] = AM53C974_read_8(CNTLREG3
);
532 cntlreg
[3] = AM53C974_read_8(CNTLREG4
);
533 dmacmd
= AM53C974_read_8(DMACMD
);
534 dmastc
= AM53C974_read_32(DMASTC
);
535 dmaspa
= AM53C974_read_32(DMASPA
);
536 dmawbc
= AM53C974_read_32(DMAWBC
);
537 dmawac
= AM53C974_read_32(DMAWAC
);
538 dmastatus
= AM53C974_read_8(DMASTATUS
);
539 restore_flags(flags
);
541 printk("AM53C974 register dump:\n");
542 printk("IO base: 0x%04lx; CTCREG: 0x%04lx; CMDREG: 0x%02x; STATREG: 0x%02x; ISREG: 0x%02x\n",
543 io_port
, ctcreg
, cmdreg
, statreg
, isreg
);
544 printk("CFIREG: 0x%02x; CNTLREG1-4: 0x%02x; 0x%02x; 0x%02x; 0x%02x\n",
545 cfireg
, cntlreg
[0], cntlreg
[1], cntlreg
[2], cntlreg
[3]);
546 printk("DMACMD: 0x%02x; DMASTC: 0x%04lx; DMASPA: 0x%04lx\n", dmacmd
, dmastc
, dmaspa
);
547 printk("DMAWBC: 0x%04lx; DMAWAC: 0x%04lx; DMASTATUS: 0x%02x\n", dmawbc
, dmawac
, dmastatus
);
548 printk("---------------------------------------------------------\n");
551 /**************************************************************************
552 * Function : void AM53C974_keywait(void)
554 * Purpose : wait until a key is pressed, if it was the 'r' key leave singlestep mode;
555 * this function is used for debugging only
558 **************************************************************************/
559 static void AM53C974_keywait(void)
562 #ifdef AM53C974_DEBUG
571 while ((inb_p(0x64) & 0x01) != 0x01);
572 #ifdef AM53C974_DEBUG
575 deb_stop
= 0; /* don't stop if 'r' was pressed */
577 restore_flags(flags
);
580 /**************************************************************************
581 * Function : AM53C974_setup(char *str, int *ints)
583 * Purpose : LILO command line initialization of the overrides array,
585 * Inputs : str - unused, ints - array of integer parameters with ints[0]
586 * equal to the number of ints.
588 * NOTE : this function needs to be declared as an external function
589 * in init/main.c and included there in the bootsetups list
590 ***************************************************************************/
591 void AM53C974_setup(char *str
, int *ints
)
594 printk("AM53C974_setup: wrong number of parameters;\n correct syntax is: AM53C974=host-scsi-id, target-scsi-id, max-rate, max-offset\n");
596 if (commandline_current
< (sizeof(overrides
) / sizeof(override_t
))) {
597 if ((ints
[1] < 0) || (ints
[1] > 7) ||
598 (ints
[2] < 0) || (ints
[2] > 7) ||
599 (ints
[1] == ints
[2]) ||
600 (ints
[3] < (DEF_CLK
/ MAX_PERIOD
)) || (ints
[3] > (DEF_CLK
/ MIN_PERIOD
)) ||
601 (ints
[4] < 0) || (ints
[4] > MAX_OFFSET
))
602 printk("AM53C974_setup: illegal parameter\n");
604 overrides
[commandline_current
].host_scsi_id
= ints
[1];
605 overrides
[commandline_current
].target_scsi_id
= ints
[2];
606 overrides
[commandline_current
].max_rate
= ints
[3];
607 overrides
[commandline_current
].max_offset
= ints
[4];
608 commandline_current
++;
611 printk("AM53C974_setup: too many overrides\n");
615 #if defined (CONFIG_PCI)
616 /**************************************************************************
617 * Function : int AM53C974_pci_detect(Scsi_Host_Template *tpnt)
619 * Purpose : detects and initializes AM53C974 SCSI chips with PCI Bios
621 * Inputs : tpnt - host template
623 * Returns : number of host adapters detected
624 **************************************************************************/
625 static __inline__
int AM53C974_pci_detect(Scsi_Host_Template
* tpnt
)
627 int count
= 0; /* number of boards detected */
628 struct pci_dev
*pdev
= NULL
;
629 unsigned short command
;
631 while ((pdev
= pci_find_device(PCI_VENDOR_ID_AMD
, PCI_DEVICE_ID_AMD_SCSI
, pdev
))) {
632 pci_read_config_word(pdev
, PCI_COMMAND
, &command
);
634 /* check whether device is I/O mapped -- should be */
635 if (!(command
& PCI_COMMAND_IO
))
638 /* PCI Spec 2.1 states that it is either the driver's or the PCI card's responsibility
639 to set the PCI Master Enable Bit if needed.
640 (from Mark Stockton <marks@schooner.sys.hou.compaq.com>) */
641 if (!(command
& PCI_COMMAND_MASTER
)) {
642 command
|= PCI_COMMAND_MASTER
;
643 printk("PCI Master Bit has not been set. Setting...\n");
644 pci_write_config_word(pdev
, PCI_COMMAND
, command
);
646 /* everything seems OK now, so initialize */
647 if (AM53C974_init(tpnt
, pdev
))
654 /**************************************************************************
655 * Function : int AM53C974_detect(Scsi_Host_Template *tpnt)
657 * Purpose : detects and initializes AM53C974 SCSI chips
659 * Inputs : tpnt - host template
661 * Returns : number of host adapters detected
662 **************************************************************************/
663 int __init
AM53C974_detect(Scsi_Host_Template
* tpnt
)
665 int count
= 0; /* number of boards detected */
667 tpnt
->proc_dir
= &proc_scsi_am53c974
;
669 #if defined (CONFIG_PCI)
671 count
= AM53C974_pci_detect(tpnt
);
676 /**************************************************************************
677 * Function : int AM53C974_init(Scsi_Host_Template *tpnt, struct pci_dev *pdev)
679 * Purpose : initializes instance and corresponding AM53/79C974 chip,
681 * Inputs : tpnt - template, pci_config - PCI configuration,
683 * Returns : 1 on success, 0 on failure.
685 * NOTE: If no override for the controller's SCSI id is given and AM53C974_SCSI_ID
686 * is not defined we assume that the SCSI address of this controller is correctly
687 * set up by the BIOS (as reflected by contents of register CNTLREG1).
688 * This is the only BIOS assistance we need.
689 **************************************************************************/
690 static int __init
AM53C974_init(Scsi_Host_Template
* tpnt
, struct pci_dev
*pdev
)
692 AM53C974_local_declare();
694 struct Scsi_Host
*instance
, *search
;
695 struct AM53C974_hostdata
*hostdata
;
697 #ifdef AM53C974_OPTION_DEBUG_PROBE_ONLY
698 printk("AM53C974: probe only enabled, aborting initialization\n");
702 instance
= scsi_register(tpnt
, sizeof(struct AM53C974_hostdata
));
703 hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
704 instance
->base
= NULL
;
705 instance
->io_port
= pdev
->resource
[0].start
;
706 instance
->irq
= pdev
->irq
;
707 instance
->dma_channel
= -1;
708 AM53C974_setio(instance
);
710 #ifdef AM53C974_SCSI_ID
711 instance
->this_id
= AM53C974_SCSI_ID
;
712 AM53C974_write_8(CNTLREG1
, instance
->this_id
& CNTLREG1_SID
);
714 instance
->this_id
= AM53C974_read_8(CNTLREG1
) & CNTLREG1_SID
;
715 if (instance
->this_id
!= 7)
716 printk("scsi%d: WARNING: unusual hostadapter SCSI id %d; please verify!\n",
717 instance
->host_no
, instance
->this_id
);
720 for (i
= 0; i
< sizeof(hostdata
->msgout
); i
++) {
721 hostdata
->msgout
[i
] = NOP
;
722 hostdata
->last_message
[i
] = NOP
;
724 for (i
= 0; i
< 8; i
++) {
725 hostdata
->busy
[i
] = 0;
726 hostdata
->sync_per
[i
] = DEF_STP
;
727 hostdata
->sync_off
[i
] = 0;
728 hostdata
->sync_neg
[i
] = 0;
729 hostdata
->sync_en
[i
] = DEFAULT_SYNC_NEGOTIATION_ENABLED
;
730 hostdata
->max_rate
[i
] = DEFAULT_RATE
;
731 hostdata
->max_offset
[i
] = DEFAULT_SYNC_OFFSET
;
734 /* overwrite defaults by LILO overrides */
735 for (i
= 0; i
< commandline_current
; i
++) {
736 if (overrides
[i
].host_scsi_id
== instance
->this_id
) {
737 j
= overrides
[i
].target_scsi_id
;
738 hostdata
->sync_en
[j
] = 1;
739 hostdata
->max_rate
[j
] = overrides
[i
].max_rate
;
740 hostdata
->max_offset
[j
] = overrides
[i
].max_offset
;
744 hostdata
->sel_cmd
= NULL
;
745 hostdata
->connected
= NULL
;
746 hostdata
->issue_queue
= NULL
;
747 hostdata
->disconnected_queue
= NULL
;
748 hostdata
->in_reset
= 0;
749 hostdata
->aborted
= 0;
750 hostdata
->selecting
= 0;
751 hostdata
->disconnecting
= 0;
752 hostdata
->dma_busy
= 0;
754 /* Set up an interrupt handler if we aren't already sharing an IRQ with another board */
755 for (search
= first_host
;
756 search
&& (((the_template
!= NULL
) && (search
->hostt
!= the_template
)) ||
757 (search
->irq
!= instance
->irq
) || (search
== instance
));
758 search
= search
->next
);
760 if (request_irq(instance
->irq
, do_AM53C974_intr
, SA_SHIRQ
, "AM53C974", instance
)) {
761 printk("scsi%d: IRQ%d not free, detaching\n", instance
->host_no
, instance
->irq
);
762 scsi_unregister(instance
);
766 printk("scsi%d: using interrupt handler previously installed for scsi%d\n",
767 instance
->host_no
, search
->host_no
);
771 the_template
= instance
->hostt
;
772 first_instance
= instance
;
775 AM53C974_write_8(CMDREG
, CMDREG_RDEV
); /* reset device */
777 AM53C974_write_8(CMDREG
, CMDREG_NOP
);
778 AM53C974_write_8(CNTLREG1
, CNTLREG1_DISR
| instance
->this_id
);
779 AM53C974_write_8(CMDREG
, CMDREG_RBUS
); /* reset SCSI bus */
781 AM53C974_config_after_reset(instance
);
786 /*********************************************************************
787 * Function : AM53C974_config_after_reset(struct Scsi_Host *instance) *
789 * Purpose : initializes chip registers after reset *
791 * Inputs : instance - which AM53C974 *
793 * Returns : nothing *
794 **********************************************************************/
795 static void AM53C974_config_after_reset(struct Scsi_Host
*instance
)
797 AM53C974_local_declare();
798 AM53C974_setio(instance
);
800 /* clear SCSI FIFO */
801 AM53C974_write_8(CMDREG
, CMDREG_CFIFO
);
803 /* configure device */
804 AM53C974_write_8(STIMREG
, DEF_SCSI_TIMEOUT
);
805 AM53C974_write_8(STPREG
, DEF_STP
& STPREG_STP
);
806 AM53C974_write_8(SOFREG
, (DEF_SOF_RAD
<< 6) | (DEF_SOF_RAA
<< 4));
807 AM53C974_write_8(CLKFREG
, DEF_CLKF
& CLKFREG_MASK
);
808 AM53C974_write_8(CNTLREG1
, (DEF_ETM
<< 7) | CNTLREG1_DISR
| (DEF_PERE
<< 4) | instance
->this_id
);
809 AM53C974_write_8(CNTLREG2
, (DEF_ENF
<< 6));
810 AM53C974_write_8(CNTLREG3
, (DEF_ADIDCHK
<< 7) | (DEF_FASTSCSI
<< 4) | (DEF_FASTCLK
<< 3));
811 AM53C974_write_8(CNTLREG4
, (DEF_GLITCH
<< 6) | (DEF_PWD
<< 5) | (DEF_RAE
<< 3) | (DEF_RADE
<< 2) | CNTLREG4_RES
);
814 /***********************************************************************
815 * Function : const char *AM53C974_info(struct Scsi_Host *instance) *
817 * Purpose : return device driver information *
819 * Inputs : instance - which AM53C974 *
821 * Returns : info string *
822 ************************************************************************/
823 const char *AM53C974_info(struct Scsi_Host
*instance
)
825 static char info
[100];
827 sprintf(info
, "AM53/79C974 PCscsi driver rev. %d.%d; host I/O address: 0x%lx; irq: %d\n",
828 AM53C974_DRIVER_REVISION_MAJOR
, AM53C974_DRIVER_REVISION_MINOR
,
829 instance
->io_port
, instance
->irq
);
833 /**************************************************************************
834 * Function : int AM53C974_command (Scsi_Cmnd *SCpnt) *
836 * Purpose : the unqueued SCSI command function, replaced by the *
837 * AM53C974_queue_command function *
839 * Inputs : SCpnt - pointer to command structure *
841 * Returns :status, see hosts.h for details *
842 ***************************************************************************/
843 int AM53C974_command(Scsi_Cmnd
* SCpnt
)
845 DEB(printk("AM53C974_command called\n"));
849 /**************************************************************************
850 * Function : void initialize_SCp(Scsi_Cmnd *cmd) *
852 * Purpose : initialize the saved data pointers for cmd to point to the *
853 * start of the buffer. *
855 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset. *
857 * Returns : nothing *
858 **************************************************************************/
859 static __inline__
void initialize_SCp(Scsi_Cmnd
* cmd
)
862 cmd
->SCp
.buffer
= (struct scatterlist
*) cmd
->buffer
;
863 cmd
->SCp
.buffers_residual
= cmd
->use_sg
- 1;
864 cmd
->SCp
.ptr
= (char *) cmd
->SCp
.buffer
->address
;
865 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
867 cmd
->SCp
.buffer
= NULL
;
868 cmd
->SCp
.buffers_residual
= 0;
869 cmd
->SCp
.ptr
= (char *) cmd
->request_buffer
;
870 cmd
->SCp
.this_residual
= cmd
->request_bufflen
;
874 /**************************************************************************
875 * Function : run_main(void) *
877 * Purpose : insure that the coroutine is running and will process our *
878 * request. main_running is checked/set here (in an inline *
879 * function rather than in AM53C974_main itself to reduce the *
880 * chances of stack overflow. *
885 * Returns : nothing *
886 **************************************************************************/
887 static __inline__
void run_main(void)
893 /* main_running is cleared in AM53C974_main once it can't do
894 more work, and AM53C974_main exits with interrupts disabled. */
898 restore_flags(flags
);
901 /**************************************************************************
902 * Function : int AM53C974_queue_command(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
904 * Purpose : writes SCSI command into AM53C974 FIFO
906 * Inputs : cmd - SCSI command, done - function called on completion, with
907 * a pointer to the command descriptor.
909 * Returns : status, see hosts.h for details
912 * cmd is added to the per instance issue_queue, with minor
913 * twiddling done to the host specific fields of cmd. If the
914 * main coroutine is not running, it is restarted.
915 **************************************************************************/
916 int AM53C974_queue_command(Scsi_Cmnd
* cmd
, void (*done
) (Scsi_Cmnd
*))
919 struct Scsi_Host
*instance
= cmd
->host
;
920 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
925 DEB_QUEUE(printk(SEPARATOR_LINE
));
926 DEB_QUEUE(printk("scsi%d: AM53C974_queue_command called\n", instance
->host_no
));
927 DEB_QUEUE(printk("cmd=%02x target=%02x lun=%02x bufflen=%d use_sg = %02x\n",
928 cmd
->cmnd
[0], cmd
->target
, cmd
->lun
, cmd
->request_bufflen
, cmd
->use_sg
));
930 /* We use the host_scribble field as a pointer to the next command in a queue */
931 cmd
->host_scribble
= NULL
;
932 cmd
->scsi_done
= done
;
934 cmd
->device
->disconnect
= 0;
936 /* Insert the cmd into the issue queue. Note that REQUEST SENSE
937 * commands are added to the head of the queue since any command will
938 * clear the contingent allegiance condition that exists and the
939 * sense data is only guaranteed to be valid while the condition exists. */
940 if (!(hostdata
->issue_queue
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) {
941 LIST(cmd
, hostdata
->issue_queue
);
942 cmd
->host_scribble
= (unsigned char *) hostdata
->issue_queue
;
943 hostdata
->issue_queue
= cmd
;
945 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
; tmp
->host_scribble
;
946 tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
);
948 tmp
->host_scribble
= (unsigned char *) cmd
;
951 DEB_QUEUE(printk("scsi%d : command added to %s of queue\n", instance
->host_no
,
952 (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail"));
954 /* Run the coroutine if it isn't already running. */
956 restore_flags(flags
);
960 /**************************************************************************
961 * Function : AM53C974_main (void)
963 * Purpose : AM53C974_main is a coroutine that runs as long as more work can
964 * be done on the AM53C974 host adapters in a system. Both
965 * AM53C974_queue_command() and AM53C974_intr() will try to start it
966 * in case it is not running.
968 * NOTE : AM53C974_main exits with interrupts *disabled*, the caller should
969 * reenable them. This prevents reentrancy and kernel stack overflow.
970 **************************************************************************/
971 static void AM53C974_main(void)
973 AM53C974_local_declare();
975 Scsi_Cmnd
*tmp
, *prev
;
976 struct Scsi_Host
*instance
;
977 struct AM53C974_hostdata
*hostdata
;
980 /* We run (with interrupts disabled) until we're sure that none of
981 * the host adapters have anything that can be done, at which point
982 * we set main_running to 0 and exit. */
985 cli(); /* Freeze request queues */
988 for (instance
= first_instance
; instance
&& instance
->hostt
== the_template
;
989 instance
= instance
->next
) {
990 hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
991 AM53C974_setio(instance
);
992 /* start to select target if we are not connected and not in the
994 if (!hostdata
->connected
&& !hostdata
->sel_cmd
) {
995 /* Search through the issue_queue for a command destined for a target
997 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
, prev
= NULL
; tmp
;
998 prev
= tmp
, tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
) {
999 /* When we find one, remove it from the issue queue. */
1000 if (!(hostdata
->busy
[tmp
->target
] & (1 << tmp
->lun
))) {
1002 REMOVE(prev
, (Scsi_Cmnd
*) (prev
->host_scribble
), tmp
,
1003 (Scsi_Cmnd
*) (tmp
->host_scribble
));
1004 prev
->host_scribble
= tmp
->host_scribble
;
1006 REMOVE(-1, hostdata
->issue_queue
, tmp
, tmp
->host_scribble
);
1007 hostdata
->issue_queue
= (Scsi_Cmnd
*) tmp
->host_scribble
;
1009 tmp
->host_scribble
= NULL
;
1011 /* go into selection mode, disable reselection and wait for
1012 SO interrupt which will continue with the selection process */
1013 hostdata
->selecting
= 1;
1014 hostdata
->sel_cmd
= tmp
;
1015 AM53C974_write_8(CMDREG
, CMDREG_DSR
);
1017 } /* if target/lun is not busy */
1020 /* if (!hostdata->connected) */
1022 DEB(printk("main: connected; cmd = 0x%lx, sel_cmd = 0x%lx\n",
1023 (long) hostdata
->connected
, (long) hostdata
->sel_cmd
));
1025 } /* for instance */
1028 restore_flags(flags
);
1031 /************************************************************************
1032 * Function : AM53C974_intr(int irq, void *dev_id, struct pt_regs *regs) *
1034 * Purpose : interrupt handler *
1036 * Inputs : irq - interrupt line, regs - ? *
1038 * Returns : nothing *
1039 ************************************************************************/
1040 static void do_AM53C974_intr(int irq
, void *dev_id
, struct pt_regs
*regs
)
1042 unsigned long flags
;
1044 spin_lock_irqsave(&io_request_lock
, flags
);
1045 AM53C974_intr(irq
, dev_id
, regs
);
1046 spin_unlock_irqrestore(&io_request_lock
, flags
);
1049 /************************************************************************
1050 * Function : AM53C974_intr(int irq, void *dev_id, struct pt_regs *regs) *
1052 * Purpose : interrupt handler *
1054 * Inputs : irq - interrupt line, regs - ? *
1056 * Returns : nothing *
1057 ************************************************************************/
1058 static void AM53C974_intr(int irq
, void *dev_id
, struct pt_regs
*regs
)
1060 AM53C974_local_declare();
1061 struct Scsi_Host
*instance
;
1062 struct AM53C974_hostdata
*hostdata
;
1063 unsigned char cmdreg
, dmastatus
, statreg
, isreg
, instreg
, cfifo
;
1065 /* find AM53C974 hostadapter responsible for this interrupt */
1066 for (instance
= first_instance
; instance
; instance
= instance
->next
)
1067 if ((instance
->irq
== irq
) && (instance
->hostt
== the_template
))
1071 /* found; now decode and process */
1073 hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
1074 AM53C974_setio(instance
);
1075 dmastatus
= AM53C974_read_8(DMASTATUS
);
1077 DEB_INTR(printk(SEPARATOR_LINE
));
1078 DEB_INTR(printk("AM53C974 interrupt; dmastatus=0x%02x\n", dmastatus
));
1081 /*** DMA related interrupts ***/
1082 if (hostdata
->connected
&& (dmastatus
& (DMASTATUS_ERROR
| DMASTATUS_PWDN
|
1083 DMASTATUS_ABORT
))) {
1084 /* DMA error or POWERDOWN */
1085 printk("scsi%d: DMA error or powerdown; dmastatus: 0x%02x\n",
1086 instance
->host_no
, dmastatus
);
1087 #ifdef AM53C974_DEBUG
1090 panic("scsi%d: cannot recover\n", instance
->host_no
);
1092 if (hostdata
->connected
&& (dmastatus
& DMASTATUS_DONE
)) {
1093 /* DMA transfer done */
1094 unsigned long residual
;
1095 unsigned long flags
;
1098 if (!(AM53C974_read_8(DMACMD
) & DMACMD_DIR
)) {
1100 dmastatus
= AM53C974_read_8(DMASTATUS
);
1101 residual
= AM53C974_read_8(CTCLREG
) | (AM53C974_read_8(CTCMREG
) << 8) |
1102 (AM53C974_read_8(CTCHREG
) << 16);
1103 residual
+= AM53C974_read_8(CFIREG
) & CFIREG_CF
;
1104 } while (!(dmastatus
& DMASTATUS_SCSIINT
) && residual
);
1105 residual
= AM53C974_read_8(CTCLREG
) | (AM53C974_read_8(CTCMREG
) << 8) |
1106 (AM53C974_read_8(CTCHREG
) << 16);
1107 residual
+= AM53C974_read_8(CFIREG
) & CFIREG_CF
;
1110 hostdata
->connected
->SCp
.ptr
+= hostdata
->connected
->SCp
.this_residual
- residual
;
1111 hostdata
->connected
->SCp
.this_residual
= residual
;
1113 AM53C974_write_8(DMACMD
, DMACMD_IDLE
);
1115 /* if service request missed before, process it now (ugly) */
1116 if (hostdata
->dma_busy
) {
1117 hostdata
->dma_busy
= 0;
1118 cmdreg
= AM53C974_read_8(CMDREG
);
1119 statreg
= AM53C974_read_8(STATREG
);
1120 isreg
= AM53C974_read_8(ISREG
);
1121 instreg
= AM53C974_read_8(INSTREG
);
1122 cfifo
= AM53C974_cfifo();
1123 AM53C974_information_transfer(instance
, statreg
, isreg
, instreg
, cfifo
,
1126 restore_flags(flags
);
1128 if (!(dmastatus
& DMASTATUS_SCSIINT
)) {
1131 /*** SCSI related interrupts ***/
1132 cmdreg
= AM53C974_read_8(CMDREG
);
1133 statreg
= AM53C974_read_8(STATREG
);
1134 isreg
= AM53C974_read_8(ISREG
);
1135 instreg
= AM53C974_read_8(INSTREG
);
1136 cfifo
= AM53C974_cfifo();
1138 DEB_INTR(printk("scsi%d: statreg: 0x%02x; isreg: 0x%02x; instreg: 0x%02x; cfifo: 0x%02x\n",
1139 instance
->host_no
, statreg
, isreg
, instreg
, cfifo
));
1141 if (statreg
& STATREG_PE
) {
1143 #ifdef AM53C974_DEBUG
1146 printk("scsi%d : PARITY error\n", instance
->host_no
);
1147 if (hostdata
->connected
)
1148 hostdata
->sync_off
[hostdata
->connected
->target
] = 0; /* setup asynchronous transfer */
1149 hostdata
->aborted
= 1;
1151 if (statreg
& STATREG_IOE
) {
1152 /* illegal operation error */
1153 #ifdef AM53C974_DEBUG
1156 printk("scsi%d : ILLEGAL OPERATION error\n", instance
->host_no
);
1157 printk("cmdreg: 0x%02x; dmacmd: 0x%02x; statreg: 0x%02x; \n"
1158 "isreg: 0x%02x; instreg: 0x%02x; cfifo: 0x%02x\n",
1159 cmdreg
, AM53C974_read_8(DMACMD
), statreg
, isreg
, instreg
, cfifo
);
1161 if (hostdata
->in_reset
&& (instreg
& INSTREG_SRST
)) {
1162 unsigned long flags
;
1163 /* RESET INTERRUPT */
1164 #ifdef AM53C974_DEBUG
1167 DEB(printk("Bus reset interrupt received\n"));
1168 AM53C974_intr_bus_reset(instance
);
1171 if (hostdata
->connected
) {
1172 hostdata
->connected
->result
= DID_RESET
<< 16;
1173 hostdata
->connected
->scsi_done((Scsi_Cmnd
*) hostdata
->connected
);
1174 hostdata
->connected
= NULL
;
1176 if (hostdata
->sel_cmd
) {
1177 hostdata
->sel_cmd
->result
= DID_RESET
<< 16;
1178 hostdata
->sel_cmd
->scsi_done((Scsi_Cmnd
*) hostdata
->sel_cmd
);
1179 hostdata
->sel_cmd
= NULL
;
1182 restore_flags(flags
);
1183 if (hostdata
->in_reset
== 1)
1188 if (instreg
& INSTREG_ICMD
) {
1189 /* INVALID COMMAND INTERRUPT */
1190 #ifdef AM53C974_DEBUG
1193 printk("scsi%d: Invalid command interrupt\n", instance
->host_no
);
1194 printk("cmdreg: 0x%02x; dmacmd: 0x%02x; statreg: 0x%02x; dmastatus: 0x%02x; \n"
1195 "isreg: 0x%02x; instreg: 0x%02x; cfifo: 0x%02x\n",
1196 cmdreg
, AM53C974_read_8(DMACMD
), statreg
, dmastatus
, isreg
, instreg
, cfifo
);
1197 panic("scsi%d: cannot recover\n", instance
->host_no
);
1199 if (instreg
& INSTREG_DIS
) {
1200 unsigned long flags
;
1201 /* DISCONNECT INTERRUPT */
1202 DEB_INTR(printk("Disconnect interrupt received; "));
1205 AM53C974_intr_disconnect(instance
);
1206 restore_flags(flags
);
1209 if (instreg
& INSTREG_RESEL
) {
1210 unsigned long flags
;
1211 /* RESELECTION INTERRUPT */
1212 DEB_INTR(printk("Reselection interrupt received\n"));
1215 AM53C974_intr_reselect(instance
, statreg
);
1216 restore_flags(flags
);
1219 if (instreg
& INSTREG_SO
) {
1220 DEB_INTR(printk("Successful operation interrupt received\n"));
1221 if (hostdata
->selecting
) {
1222 unsigned long flags
;
1223 DEB_INTR(printk("DSR completed, starting select\n"));
1226 AM53C974_select(instance
, (Scsi_Cmnd
*) hostdata
->sel_cmd
,
1227 (hostdata
->sel_cmd
->cmnd
[0] == REQUEST_SENSE
) ?
1228 TAG_NONE
: TAG_NEXT
);
1229 hostdata
->selecting
= 0;
1230 AM53C974_set_sync(instance
, hostdata
->sel_cmd
->target
);
1231 restore_flags(flags
);
1234 if (hostdata
->sel_cmd
!= NULL
) {
1235 if (((isreg
& ISREG_IS
) != ISREG_OK_NO_STOP
) &&
1236 ((isreg
& ISREG_IS
) != ISREG_OK_STOP
)) {
1237 unsigned long flags
;
1238 /* UNSUCCESSFUL SELECTION */
1239 DEB_INTR(printk("unsuccessful selection\n"));
1242 hostdata
->dma_busy
= 0;
1243 LIST(hostdata
->sel_cmd
, hostdata
->issue_queue
);
1244 hostdata
->sel_cmd
->host_scribble
= (unsigned char *) hostdata
->issue_queue
;
1245 hostdata
->issue_queue
= hostdata
->sel_cmd
;
1246 hostdata
->sel_cmd
= NULL
;
1247 hostdata
->selecting
= 0;
1248 restore_flags(flags
);
1251 unsigned long flags
;
1252 /* SUCCESSFUL SELECTION */
1253 DEB(printk("successful selection; cmd=0x%02lx\n", (long) hostdata
->sel_cmd
));
1256 hostdata
->dma_busy
= 0;
1257 hostdata
->disconnecting
= 0;
1258 hostdata
->connected
= hostdata
->sel_cmd
;
1259 hostdata
->sel_cmd
= NULL
;
1260 hostdata
->selecting
= 0;
1262 if (!hostdata
->connected
->device
->tagged_queue
)
1264 hostdata
->busy
[hostdata
->connected
->target
] |= (1 << hostdata
->connected
->lun
);
1265 /* very strange -- use_sg is sometimes nonzero for request sense commands !! */
1266 if ((hostdata
->connected
->cmnd
[0] == REQUEST_SENSE
) && hostdata
->connected
->use_sg
) {
1267 DEB(printk("scsi%d: REQUEST_SENSE command with nonzero use_sg\n", instance
->host_no
));
1269 hostdata
->connected
->use_sg
= 0;
1271 initialize_SCp((Scsi_Cmnd
*) hostdata
->connected
);
1272 hostdata
->connected
->SCp
.phase
= PHASE_CMDOUT
;
1273 AM53C974_information_transfer(instance
, statreg
, isreg
, instreg
, cfifo
, dmastatus
);
1274 restore_flags(flags
);
1278 unsigned long flags
;
1281 AM53C974_information_transfer(instance
, statreg
, isreg
, instreg
, cfifo
, dmastatus
);
1282 restore_flags(flags
);
1286 if (instreg
& INSTREG_SR
) {
1287 DEB_INTR(printk("Service request interrupt received, "));
1288 if (hostdata
->connected
) {
1289 unsigned long flags
;
1290 DEB_INTR(printk("calling information_transfer\n"));
1293 AM53C974_information_transfer(instance
, statreg
, isreg
, instreg
, cfifo
, dmastatus
);
1294 restore_flags(flags
);
1296 printk("scsi%d: weird: service request when no command connected\n", instance
->host_no
);
1297 AM53C974_write_8(CMDREG
, CMDREG_CFIFO
);
1302 DEB_INTR(printk("intr: starting main\n"));
1304 DEB_INTR(printk("end of intr\n"));
1307 /**************************************************************************
1308 * Function : AM53C974_intr_disconnect(struct Scsi_Host *instance)
1310 * Purpose : manage target disconnection
1312 * Inputs : instance -- which AM53C974
1315 **************************************************************************/
1316 static void AM53C974_intr_disconnect(struct Scsi_Host
*instance
)
1318 AM53C974_local_declare();
1319 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
1321 AM53C974_setio(instance
);
1323 if (hostdata
->sel_cmd
!= NULL
) {
1324 /* normal selection timeout, typical for nonexisting targets */
1325 cmd
= (Scsi_Cmnd
*) hostdata
->sel_cmd
;
1326 DEB_INTR(printk("bad target\n"));
1327 cmd
->result
= DID_BAD_TARGET
<< 16;
1330 if (!hostdata
->connected
) {
1331 /* can happen if controller was reset, a device tried to reconnect,
1332 failed and disconnects now */
1333 AM53C974_write_8(CMDREG
, CMDREG_CFIFO
);
1336 if (hostdata
->disconnecting
) {
1337 /* target sent disconnect message, so we are prepared */
1338 cmd
= (Scsi_Cmnd
*) hostdata
->connected
;
1339 AM53C974_set_async(instance
, cmd
->target
);
1340 DEB_INTR(printk("scsi%d : disc. from cmnd %d for ta %d, lun %d\n",
1341 instance
->host_no
, cmd
->cmnd
[0], cmd
->target
, cmd
->lun
));
1342 if (cmd
->device
->disconnect
) {
1343 /* target wants to reselect later */
1344 DEB_INTR(printk("ok, re-enabling selection\n"));
1345 LIST(cmd
, hostdata
->disconnected_queue
);
1346 cmd
->host_scribble
= (unsigned char *) hostdata
->disconnected_queue
;
1347 hostdata
->disconnected_queue
= cmd
;
1348 DEB_QUEUE(printk("scsi%d : command for target %d lun %d this %d was moved from connected to"
1349 " the disconnected_queue\n", instance
->host_no
, cmd
->target
,
1350 cmd
->lun
, hostdata
->disconnected_queue
->SCp
.this_residual
));
1351 DEB_QUEUE(AM53C974_print_queues(instance
));
1352 goto EXIT_UNFINISHED
;
1354 /* target does not want to reselect later, we are really finished */
1355 #ifdef AM53C974_DEBUG
1356 if (cmd
->cmnd
[0] == REQUEST_SENSE
) {
1358 printk("Request sense data dump:\n");
1359 for (i
= 0; i
< cmd
->request_bufflen
; i
++) {
1360 printk("%02x ", *((char *) (cmd
->request_buffer
) + i
));
1368 } /* !cmd->device->disconnect */
1369 } /* if (hostdata->disconnecting) */
1370 /* no disconnect message received; unexpected disconnection */
1371 cmd
= (Scsi_Cmnd
*) hostdata
->connected
;
1373 #ifdef AM53C974_DEBUG
1376 AM53C974_set_async(instance
, cmd
->target
);
1377 printk("scsi%d: Unexpected disconnect; phase: %d; target: %d; this_residual: %d; buffers_residual: %d; message: %d\n",
1378 instance
->host_no
, cmd
->SCp
.phase
, cmd
->target
, cmd
->SCp
.this_residual
, cmd
->SCp
.buffers_residual
,
1380 printk("cmdreg: 0x%02x; statreg: 0x%02x; isreg: 0x%02x; cfifo: 0x%02x\n",
1381 AM53C974_read_8(CMDREG
), AM53C974_read_8(STATREG
), AM53C974_read_8(ISREG
),
1382 AM53C974_read_8(CFIREG
) & CFIREG_CF
);
1384 if ((hostdata
->last_message
[0] == EXTENDED_MESSAGE
) &&
1385 (hostdata
->last_message
[2] == EXTENDED_SDTR
)) {
1386 /* sync. negotiation was aborted, setup asynchronous transfer with target */
1387 hostdata
->sync_off
[cmd
->target
] = 0;
1389 if (hostdata
->aborted
|| hostdata
->msgout
[0] == ABORT
)
1390 cmd
->result
= DID_ABORT
<< 16;
1392 cmd
->result
= DID_ERROR
<< 16;
1396 hostdata
->aborted
= 0;
1397 hostdata
->msgout
[0] = NOP
;
1398 hostdata
->sel_cmd
= NULL
;
1399 hostdata
->connected
= NULL
;
1400 hostdata
->selecting
= 0;
1401 hostdata
->disconnecting
= 0;
1402 hostdata
->dma_busy
= 0;
1403 hostdata
->busy
[cmd
->target
] &= ~(1 << cmd
->lun
);
1404 AM53C974_write_8(CMDREG
, CMDREG_CFIFO
);
1405 DEB(printk("disconnect; issue_queue: 0x%lx, disconnected_queue: 0x%lx\n",
1406 (long) hostdata
->issue_queue
, (long) hostdata
->disconnected_queue
));
1407 cmd
->scsi_done(cmd
);
1409 if (!hostdata
->selecting
) {
1410 AM53C974_set_async(instance
, cmd
->target
);
1411 AM53C974_write_8(CMDREG
, CMDREG_ESR
);
1412 } /* allow reselect */
1416 hostdata
->msgout
[0] = NOP
;
1417 hostdata
->sel_cmd
= NULL
;
1418 hostdata
->connected
= NULL
;
1419 hostdata
->aborted
= 0;
1420 hostdata
->selecting
= 0;
1421 hostdata
->disconnecting
= 0;
1422 hostdata
->dma_busy
= 0;
1423 DEB(printk("disconnect; issue_queue: 0x%lx, disconnected_queue: 0x%lx\n",
1424 (long) hostdata
->issue_queue
, (long) hostdata
->disconnected_queue
));
1425 if (!hostdata
->selecting
) {
1426 AM53C974_set_async(instance
, cmd
->target
);
1427 AM53C974_write_8(CMDREG
, CMDREG_ESR
);
1428 } /* allow reselect */
1432 /**************************************************************************
1433 * Function : int AM53C974_sync_neg(struct Scsi_Host *instance, int target, unsigned char *msg)
1435 * Purpose : setup message string for sync. negotiation
1437 * Inputs : instance -- which AM53C974
1438 * target -- which SCSI target to deal with
1439 * msg -- input message string
1441 * Returns : 0 if parameters accepted or 1 if not accepted
1443 * Side effects: hostdata is changed
1445 * Note: we assume here that fastclk is enabled
1446 **************************************************************************/
1447 static int AM53C974_sync_neg(struct Scsi_Host
*instance
, int target
, unsigned char *msg
)
1449 AM53C974_local_declare();
1450 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
1451 int period
, offset
, i
, rate
, rate_rem
;
1452 AM53C974_setio(instance
);
1454 period
= (DEF_CLK
* msg
[3] * 8 + 1000) / 2000;
1455 if (period
< MIN_PERIOD
) {
1456 period
= MIN_PERIOD
;
1457 hostdata
->msgout
[3] = period
/ 4;
1458 } else if (period
> MAX_PERIOD
) {
1459 period
= MAX_PERIOD
;
1460 hostdata
->msgout
[3] = period
/ 4;
1462 hostdata
->msgout
[3] = msg
[3];
1464 if (offset
> MAX_OFFSET
)
1465 offset
= MAX_OFFSET
;
1466 hostdata
->msgout
[4] = offset
;
1467 hostdata
->sync_per
[target
] = period
;
1468 hostdata
->sync_off
[target
] = offset
;
1469 for (i
= 0; i
< 3; i
++)
1470 hostdata
->msgout
[i
] = msg
[i
];
1471 if ((hostdata
->msgout
[3] != msg
[3]) || (msg
[4] != offset
))
1474 rate
= DEF_CLK
/ period
;
1475 rate_rem
= 10 * (DEF_CLK
- period
* rate
) / period
;
1478 printk("\ntarget %d: rate=%d.%d Mhz, synchronous, sync offset=%d bytes\n",
1479 target
, rate
, rate_rem
, offset
);
1481 printk("\ntarget %d: rate=%d.%d Mhz, asynchronous\n", target
, rate
, rate_rem
);
1486 /**************************************************************************
1487 * Function : AM53C974_set_async(struct Scsi_Host *instance, int target)
1489 * Purpose : put controller into async. mode
1491 * Inputs : instance -- which AM53C974
1492 * target -- which SCSI target to deal with
1495 **************************************************************************/
1496 static __inline__
void AM53C974_set_async(struct Scsi_Host
*instance
, int target
)
1498 AM53C974_local_declare();
1499 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
1500 AM53C974_setio(instance
);
1502 AM53C974_write_8(STPREG
, hostdata
->sync_per
[target
]);
1503 AM53C974_write_8(SOFREG
, (DEF_SOF_RAD
<< 6) | (DEF_SOF_RAA
<< 4));
1506 /**************************************************************************
1507 * Function : AM53C974_set_sync(struct Scsi_Host *instance, int target)
1509 * Purpose : put controller into sync. mode
1511 * Inputs : instance -- which AM53C974
1512 * target -- which SCSI target to deal with
1515 **************************************************************************/
1516 static __inline__
void AM53C974_set_sync(struct Scsi_Host
*instance
, int target
)
1518 AM53C974_local_declare();
1519 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
1520 AM53C974_setio(instance
);
1522 AM53C974_write_8(STPREG
, hostdata
->sync_per
[target
]);
1523 AM53C974_write_8(SOFREG
, (SOFREG_SO
& hostdata
->sync_off
[target
]) |
1524 (DEF_SOF_RAD
<< 6) | (DEF_SOF_RAA
<< 4));
1527 /***********************************************************************
1528 * Function : AM53C974_information_transfer(struct Scsi_Host *instance, *
1529 * unsigned char statreg, unsigned char isreg, *
1530 * unsigned char instreg, unsigned char cfifo, *
1531 * unsigned char dmastatus) *
1533 * Purpose : handle phase changes *
1535 * Inputs : instance - which AM53C974 *
1536 * statreg - status register *
1537 * isreg - internal state register *
1538 * instreg - interrupt status register *
1539 * cfifo - number of bytes in FIFO *
1540 * dmastatus - dma status register *
1542 * Returns : nothing *
1543 ************************************************************************/
1544 static void AM53C974_information_transfer(struct Scsi_Host
*instance
,
1545 unsigned char statreg
, unsigned char isreg
,
1546 unsigned char instreg
, unsigned char cfifo
,
1547 unsigned char dmastatus
)
1549 AM53C974_local_declare();
1550 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
1551 Scsi_Cmnd
*cmd
= (Scsi_Cmnd
*) hostdata
->connected
;
1552 int ret
, i
, len
, residual
= -1;
1553 AM53C974_setio(instance
);
1555 DEB_INFO(printk(SEPARATOR_LINE
));
1556 switch (statreg
& STATREG_PHASE
) { /* scsi phase */
1558 DEB_INFO(printk("Dataout phase; cmd=0x%lx, sel_cmd=0x%lx, this_residual=%d, buffers_residual=%d\n",
1559 (long) hostdata
->connected
, (long) hostdata
->sel_cmd
, cmd
->SCp
.this_residual
, cmd
->SCp
.buffers_residual
));
1560 cmd
->SCp
.phase
= PHASE_DATAOUT
;
1564 DEB_INFO(printk("Datain phase; cmd=0x%lx, sel_cmd=0x%lx, this_residual=%d, buffers_residual=%d\n",
1565 (long) hostdata
->connected
, (long) hostdata
->sel_cmd
, cmd
->SCp
.this_residual
, cmd
->SCp
.buffers_residual
));
1566 cmd
->SCp
.phase
= PHASE_DATAIN
;
1568 if (hostdata
->aborted
) {
1569 AM53C974_write_8(DMACMD
, DMACMD_IDLE
);
1570 AM53C974_write_8(CMDREG
, CMDREG_CFIFO
);
1571 AM53C974_write_8(CMDREG
, CMDREG_SATN
);
1574 if ((!cmd
->SCp
.this_residual
) && cmd
->SCp
.buffers_residual
) {
1576 cmd
->SCp
.buffers_residual
--;
1577 cmd
->SCp
.ptr
= (unsigned char *) cmd
->SCp
.buffer
->address
;
1578 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
1580 if (cmd
->SCp
.this_residual
) {
1581 if (!(AM53C974_read_8(DMACMD
) & DMACMD_START
)) {
1582 hostdata
->dma_busy
= 0;
1583 AM53C974_transfer_dma(instance
, statreg
& STATREG_IO
,
1584 (unsigned long) cmd
->SCp
.this_residual
,
1587 hostdata
->dma_busy
= 1;
1592 DEB_INFO(printk("Message-In phase; cmd=0x%lx, sel_cmd=0x%lx\n",
1593 (long) hostdata
->connected
, (long) hostdata
->sel_cmd
));
1594 AM53C974_set_async(instance
, cmd
->target
);
1595 if (cmd
->SCp
.phase
== PHASE_DATAIN
)
1596 AM53C974_dma_blast(instance
, dmastatus
, statreg
);
1597 if ((cmd
->SCp
.phase
== PHASE_DATAOUT
) && (AM53C974_read_8(DMACMD
) & DMACMD_START
)) {
1598 AM53C974_write_8(DMACMD
, DMACMD_IDLE
);
1599 residual
= cfifo
+ (AM53C974_read_8(CTCLREG
) | (AM53C974_read_8(CTCMREG
) << 8) |
1600 (AM53C974_read_8(CTCHREG
) << 16));
1601 cmd
->SCp
.ptr
+= cmd
->SCp
.this_residual
- residual
;
1602 cmd
->SCp
.this_residual
= residual
;
1604 AM53C974_write_8(CMDREG
, CMDREG_CFIFO
);
1608 if (cmd
->SCp
.phase
== PHASE_STATIN
) {
1609 while ((AM53C974_read_8(CFIREG
) & CFIREG_CF
) < 2);
1610 cmd
->SCp
.Status
= AM53C974_read_8(FFREG
);
1611 cmd
->SCp
.Message
= AM53C974_read_8(FFREG
);
1612 DEB_INFO(printk("Message-In phase; status=0x%02x, message=0x%02x\n",
1613 cmd
->SCp
.Status
, cmd
->SCp
.Message
));
1614 ret
= AM53C974_message(instance
, cmd
, cmd
->SCp
.Message
);
1617 AM53C974_write_8(CMDREG
, CMDREG_IT
);
1618 AM53C974_poll_int();
1619 cmd
->SCp
.Message
= AM53C974_read_8(FFREG
);
1621 ret
= AM53C974_message(instance
, cmd
, cmd
->SCp
.Message
);
1623 cmd
->SCp
.phase
= PHASE_MSGIN
;
1624 AM53C974_set_sync(instance
, cmd
->target
);
1627 DEB_INFO(printk("Message-Out phase; cfifo=%d; msgout[0]=0x%02x\n",
1628 AM53C974_read_8(CFIREG
) & CFIREG_CF
, hostdata
->msgout
[0]));
1629 AM53C974_write_8(DMACMD
, DMACMD_IDLE
);
1630 AM53C974_set_async(instance
, cmd
->target
);
1631 for (i
= 0; i
< sizeof(hostdata
->last_message
); i
++)
1632 hostdata
->last_message
[i
] = hostdata
->msgout
[i
];
1633 if ((hostdata
->msgout
[0] == 0) || INSIDE(hostdata
->msgout
[0], 0x02, 0x1F) ||
1634 INSIDE(hostdata
->msgout
[0], 0x80, 0xFF))
1637 if (hostdata
->msgout
[0] == EXTENDED_MESSAGE
) {
1638 #ifdef AM53C974_DEBUG_INFO
1639 printk("Extended message dump:\n");
1640 for (i
= 0; i
< hostdata
->msgout
[1] + 2; i
++) {
1641 printk("%02x ", hostdata
->msgout
[i
]);
1647 len
= hostdata
->msgout
[1] + 2;
1651 for (i
= 0; i
< len
; i
++)
1652 AM53C974_write_8(FFREG
, hostdata
->msgout
[i
]);
1653 AM53C974_write_8(CMDREG
, CMDREG_IT
);
1654 cmd
->SCp
.phase
= PHASE_MSGOUT
;
1655 hostdata
->msgout
[0] = NOP
;
1656 AM53C974_set_sync(instance
, cmd
->target
);
1660 DEB_INFO(printk("Command-Out phase\n"));
1661 AM53C974_set_async(instance
, cmd
->target
);
1662 for (i
= 0; i
< cmd
->cmd_len
; i
++)
1663 AM53C974_write_8(FFREG
, cmd
->cmnd
[i
]);
1664 AM53C974_write_8(CMDREG
, CMDREG_IT
);
1665 cmd
->SCp
.phase
= PHASE_CMDOUT
;
1666 AM53C974_set_sync(instance
, cmd
->target
);
1670 DEB_INFO(printk("Status phase\n"));
1671 if (cmd
->SCp
.phase
== PHASE_DATAIN
)
1672 AM53C974_dma_blast(instance
, dmastatus
, statreg
);
1673 AM53C974_set_async(instance
, cmd
->target
);
1674 if (cmd
->SCp
.phase
== PHASE_DATAOUT
) {
1675 unsigned long residual
;
1677 if (AM53C974_read_8(DMACMD
) & DMACMD_START
) {
1678 AM53C974_write_8(DMACMD
, DMACMD_IDLE
);
1679 residual
= cfifo
+ (AM53C974_read_8(CTCLREG
) | (AM53C974_read_8(CTCMREG
) << 8) |
1680 (AM53C974_read_8(CTCHREG
) << 16));
1681 cmd
->SCp
.ptr
+= cmd
->SCp
.this_residual
- residual
;
1682 cmd
->SCp
.this_residual
= residual
;
1685 AM53C974_write_8(CMDREG
, CMDREG_CFIFO
);
1689 cmd
->SCp
.phase
= PHASE_STATIN
;
1690 AM53C974_write_8(CMDREG
, CMDREG_ICCS
); /* command complete */
1695 #ifdef AM53C974_DEBUG
1698 DEB_INFO(printk("Reserved phase\n"));
1704 /******************************************************************************
1705 * Function : int AM53C974_message(struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1706 * unsigned char msg)
1708 * Purpose : handle SCSI messages
1710 * Inputs : instance -- which AM53C974
1711 * cmd -- SCSI command the message belongs to
1712 * msg -- message id byte
1714 * Returns : 1 on success, 0 on failure.
1715 **************************************************************************/
1716 static int AM53C974_message(struct Scsi_Host
*instance
, Scsi_Cmnd
* cmd
,
1719 AM53C974_local_declare();
1720 static unsigned char extended_msg
[10];
1721 unsigned char statreg
;
1724 #ifdef AM53C974_DEBUG_MSG
1727 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
1728 AM53C974_setio(instance
);
1730 DEB_MSG(printk(SEPARATOR_LINE
));
1732 /* Linking lets us reduce the time required to get the
1733 * next command out to the device, hopefully this will
1734 * mean we don't waste another revolution due to the delays
1735 * required by ARBITRATION and another SELECTION.
1736 * In the current implementation proposal, low level drivers
1737 * merely have to start the next command, pointed to by
1738 * next_link, done() is called as with unlinked commands. */
1741 case LINKED_CMD_COMPLETE
:
1742 case LINKED_FLG_CMD_COMPLETE
:
1743 /* Accept message by releasing ACK */
1744 DEB_LINKED(printk("scsi%d : target %d lun %d linked command complete.\n",
1745 instance
->host_no
, cmd
->target
, cmd
->lun
));
1746 /* Sanity check : A linked command should only terminate with
1747 * one of these messages if there are more linked commands available. */
1748 if (!cmd
->next_link
) {
1749 printk("scsi%d : target %d lun %d linked command complete, no next_link\n"
1750 instance
->host_no
, cmd
->target
, cmd
->lun
);
1751 hostdata
->aborted
= 1;
1752 AM53C974_write_8(CMDREG
, CMDREG_SATN
);
1753 AM53C974_write_8(CMDREG
, CMDREG_MA
);
1756 if (hostdata
->aborted
) {
1757 DEB_ABORT(printk("ATN set for cmnd %d upon reception of LINKED_CMD_COMPLETE or"
1758 "LINKED_FLG_CMD_COMPLETE message\n", cmd
->cmnd
[0]));
1759 AM53C974_write_8(CMDREG
, CMDREG_SATN
);
1761 AM53C974_write_8(CMDREG
, CMDREG_MA
);
1763 initialize_SCp(cmd
->next_link
);
1764 /* The next command is still part of this process */
1765 cmd
->next_link
->tag
= cmd
->tag
;
1766 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
1767 DEB_LINKED(printk("scsi%d : target %d lun %d linked request done, calling scsi_done().\n",
1768 instance
->host_no
, cmd
->target
, cmd
->lun
));
1769 cmd
->scsi_done(cmd
);
1770 cmd
= hostdata
->connected
;
1773 #endif /* def LINKED */
1776 case COMMAND_COMPLETE
:
1777 DEB_MSG(printk("scsi%d: command complete message received; cmd %d for target %d, lun %d\n",
1778 instance
->host_no
, cmd
->cmnd
[0], cmd
->target
, cmd
->lun
));
1779 hostdata
->disconnecting
= 1;
1780 cmd
->device
->disconnect
= 0;
1782 /* I'm not sure what the correct thing to do here is :
1784 * If the command that just executed is NOT a request
1785 * sense, the obvious thing to do is to set the result
1786 * code to the values of the stored parameters.
1787 * If it was a REQUEST SENSE command, we need some way
1788 * to differentiate between the failure code of the original
1789 * and the failure code of the REQUEST sense - the obvious
1790 * case is success, where we fall through and leave the result
1793 * The non-obvious place is where the REQUEST SENSE failed */
1794 if (cmd
->cmnd
[0] != REQUEST_SENSE
)
1795 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
1796 else if (cmd
->SCp
.Status
!= GOOD
)
1797 cmd
->result
= (cmd
->result
& 0x00ffff) | (DID_ERROR
<< 16);
1798 if (hostdata
->aborted
) {
1799 AM53C974_write_8(CMDREG
, CMDREG_SATN
);
1800 AM53C974_write_8(CMDREG
, CMDREG_MA
);
1801 DEB_ABORT(printk("ATN set for cmnd %d upon reception of ABORT or"
1802 "COMMAND_COMPLETE message\n", cmd
->cmnd
[0]));
1805 if ((cmd
->cmnd
[0] != REQUEST_SENSE
) && (cmd
->SCp
.Status
== CHECK_CONDITION
)) {
1806 DEB_MSG(printk("scsi%d : performing request sense\n", instance
->host_no
));
1807 cmd
->cmnd
[0] = REQUEST_SENSE
;
1808 cmd
->cmnd
[1] &= 0xe0;
1811 cmd
->cmnd
[4] = sizeof(cmd
->sense_buffer
);
1813 cmd
->SCp
.buffer
= NULL
;
1814 cmd
->SCp
.buffers_residual
= 0;
1815 cmd
->SCp
.ptr
= (char *) cmd
->sense_buffer
;
1816 cmd
->SCp
.this_residual
= sizeof(cmd
->sense_buffer
);
1817 LIST(cmd
, hostdata
->issue_queue
);
1818 cmd
->host_scribble
= (unsigned char *) hostdata
->issue_queue
;
1819 hostdata
->issue_queue
= (Scsi_Cmnd
*) cmd
;
1820 DEB_MSG(printk("scsi%d : REQUEST SENSE added to head of issue queue\n", instance
->host_no
));
1822 /* Accept message by clearing ACK */
1823 AM53C974_write_8(CMDREG
, CMDREG_MA
);
1826 case MESSAGE_REJECT
:
1827 DEB_MSG(printk("scsi%d: reject message received; cmd %d for target %d, lun %d\n",
1828 instance
->host_no
, cmd
->cmnd
[0], cmd
->target
, cmd
->lun
));
1829 switch (hostdata
->last_message
[0]) {
1830 case EXTENDED_MESSAGE
:
1831 if (hostdata
->last_message
[2] == EXTENDED_SDTR
) {
1832 /* sync. negotiation was rejected, setup asynchronous transfer with target */
1833 printk("\ntarget %d: rate=%d Mhz, asynchronous (sync. negotiation rejected)\n",
1834 cmd
->target
, DEF_CLK
/ DEF_STP
);
1835 hostdata
->sync_off
[cmd
->target
] = 0;
1836 hostdata
->sync_per
[cmd
->target
] = DEF_STP
;
1839 case HEAD_OF_QUEUE_TAG
:
1840 case ORDERED_QUEUE_TAG
:
1841 case SIMPLE_QUEUE_TAG
:
1842 cmd
->device
->tagged_queue
= 0;
1843 hostdata
->busy
[cmd
->target
] |= (1 << cmd
->lun
);
1848 if (hostdata
->aborted
)
1849 AM53C974_write_8(CMDREG
, CMDREG_SATN
);
1850 AM53C974_write_8(CMDREG
, CMDREG_MA
);
1854 DEB_MSG(printk("scsi%d: disconnect message received; cmd %d for target %d, lun %d\n",
1855 instance
->host_no
, cmd
->cmnd
[0], cmd
->target
, cmd
->lun
));
1856 cmd
->device
->disconnect
= 1;
1857 hostdata
->disconnecting
= 1;
1858 AM53C974_write_8(CMDREG
, CMDREG_MA
); /* Accept message by clearing ACK */
1862 case RESTORE_POINTERS
:
1863 DEB_MSG(printk("scsi%d: save/restore pointers message received; cmd %d for target %d, lun %d\n",
1864 instance
->host_no
, cmd
->cmnd
[0], cmd
->target
, cmd
->lun
));
1865 /* The SCSI data pointer is *IMPLICITLY* saved on a disconnect
1866 * operation, in violation of the SCSI spec so we can safely
1867 * ignore SAVE/RESTORE pointers calls.
1869 * Unfortunately, some disks violate the SCSI spec and
1870 * don't issue the required SAVE_POINTERS message before
1871 * disconnecting, and we have to break spec to remain
1873 if (hostdata
->aborted
) {
1874 DEB_ABORT(printk("ATN set for cmnd %d upon reception of SAVE/REST. POINTERS message\n",
1876 AM53C974_write_8(CMDREG
, CMDREG_SATN
);
1878 AM53C974_write_8(CMDREG
, CMDREG_MA
);
1881 case EXTENDED_MESSAGE
:
1882 DEB_MSG(printk("scsi%d: extended message received; cmd %d for target %d, lun %d\n",
1883 instance
->host_no
, cmd
->cmnd
[0], cmd
->target
, cmd
->lun
));
1884 /* Extended messages are sent in the following format :
1886 * 0 EXTENDED_MESSAGE == 1
1887 * 1 length (includes one byte for code, doesn't include first two bytes)
1889 * 3..length+1 arguments
1891 /* BEWARE!! THIS CODE IS EXTREMELY UGLY */
1892 extended_msg
[0] = EXTENDED_MESSAGE
;
1893 AM53C974_read_8(INSTREG
); /* clear int */
1894 AM53C974_write_8(CMDREG
, CMDREG_MA
); /* ack. msg byte, then wait for SO */
1895 AM53C974_poll_int();
1897 AM53C974_write_8(CMDREG
, CMDREG_IT
);
1898 AM53C974_poll_int();
1899 AM53C974_write_8(CMDREG
, CMDREG_MA
); /* ack. msg byte, then wait for SO */
1900 AM53C974_poll_int();
1901 extended_msg
[1] = len
= AM53C974_read_8(FFREG
); /* get length */
1902 p
= extended_msg
+ 2;
1903 /* read the remaining (len) bytes */
1905 AM53C974_write_8(CMDREG
, CMDREG_IT
);
1906 AM53C974_poll_int();
1908 AM53C974_write_8(CMDREG
, CMDREG_MA
); /* ack. msg byte, then wait for SO */
1909 AM53C974_poll_int();
1911 *p
= AM53C974_read_8(FFREG
);
1916 #ifdef AM53C974_DEBUG_MSG
1917 printk("scsi%d: received extended message: ", instance
->host_no
);
1918 for (j
= 0; j
< extended_msg
[1] + 2; j
++) {
1919 printk("0x%02x ", extended_msg
[j
]);
1927 if (extended_msg
[2] == EXTENDED_SDTR
)
1928 ret
= AM53C974_sync_neg(instance
, cmd
->target
, extended_msg
);
1929 if (ret
|| hostdata
->aborted
)
1930 AM53C974_write_8(CMDREG
, CMDREG_SATN
);
1932 AM53C974_write_8(CMDREG
, CMDREG_MA
);
1936 printk("scsi%d: unknown message 0x%02x received\n", instance
->host_no
, msg
);
1937 #ifdef AM53C974_DEBUG
1940 /* reject message */
1941 hostdata
->msgout
[0] = MESSAGE_REJECT
;
1942 AM53C974_write_8(CMDREG
, CMDREG_SATN
);
1943 AM53C974_write_8(CMDREG
, CMDREG_MA
);
1947 } /* switch (msg) */
1952 /**************************************************************************
1953 * Function : AM53C974_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
1955 * Purpose : try to establish nexus for the command;
1956 * start sync negotiation via start stop and transfer the command in
1957 * cmdout phase in case of an inquiry or req. sense command with no
1958 * sync. neg. performed yet
1960 * Inputs : instance -- which AM53C974
1961 * cmd -- command which requires the selection
1962 * tag -- tagged queueing
1966 * Note: this function initializes the selection process, which is continued
1967 * in the interrupt handler
1968 **************************************************************************/
1969 static void AM53C974_select(struct Scsi_Host
*instance
, Scsi_Cmnd
* cmd
, int tag
)
1971 AM53C974_local_declare();
1972 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
1973 unsigned char cfifo
, tmp
[3];
1974 unsigned int i
, len
, cmd_size
= COMMAND_SIZE(cmd
->cmnd
[0]);
1975 AM53C974_setio(instance
);
1977 cfifo
= AM53C974_cfifo();
1979 printk("scsi%d: select error; %d residual bytes in FIFO\n", instance
->host_no
, cfifo
);
1980 AM53C974_write_8(CMDREG
, CMDREG_CFIFO
); /* clear FIFO */
1982 #ifdef AM53C974_PROHIBIT_DISCONNECT
1983 tmp
[0] = IDENTIFY(0, cmd
->lun
);
1985 tmp
[0] = IDENTIFY(1, cmd
->lun
);
1989 if (cmd
->device
->tagged_queue
&& (tag
!= TAG_NONE
)) {
1990 tmp
[1] = SIMPLE_QUEUE_TAG
;
1991 if (tag
== TAG_NEXT
) {
1992 /* 0 is TAG_NONE, used to imply no tag for this command */
1993 if (cmd
->device
->current_tag
== 0)
1994 cmd
->device
->current_tag
= 1;
1995 cmd
->tag
= cmd
->device
->current_tag
;
1996 cmd
->device
->current_tag
++;
1998 cmd
->tag
= (unsigned char) tag
;
2000 hostdata
->last_message
[0] = SIMPLE_QUEUE_TAG
;
2002 AM53C974_write_8(FFREG
, tmp
[0]);
2003 AM53C974_write_8(FFREG
, tmp
[1]);
2004 AM53C974_write_8(FFREG
, tmp
[2]);
2006 #endif /* def SCSI2 */
2009 AM53C974_write_8(FFREG
, tmp
[0]);
2013 /* in case of an inquiry or req. sense command with no sync. neg performed yet, we start
2014 sync negotiation via start stops and transfer the command in cmdout phase */
2015 if (((cmd
->cmnd
[0] == INQUIRY
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) &&
2016 !(hostdata
->sync_neg
[cmd
->target
]) && hostdata
->sync_en
[cmd
->target
]) {
2017 hostdata
->sync_neg
[cmd
->target
] = 1;
2018 hostdata
->msgout
[0] = EXTENDED_MESSAGE
;
2019 hostdata
->msgout
[1] = 3;
2020 hostdata
->msgout
[2] = EXTENDED_SDTR
;
2021 hostdata
->msgout
[3] = 250 / (int) hostdata
->max_rate
[cmd
->target
];
2022 hostdata
->msgout
[4] = hostdata
->max_offset
[cmd
->target
];
2025 AM53C974_write_8(SDIDREG
, SDIREG_MASK
& cmd
->target
); /* setup dest. id */
2026 AM53C974_write_8(STIMREG
, DEF_SCSI_TIMEOUT
); /* setup timeout reg */
2029 for (i
= 0; i
< cmd_size
; i
++)
2030 AM53C974_write_8(FFREG
, cmd
->cmnd
[i
]);
2031 AM53C974_write_8(CMDREG
, CMDREG_SAS
); /* select with ATN, 1 msg byte */
2032 hostdata
->msgout
[0] = NOP
;
2035 for (i
= 0; i
< cmd_size
; i
++)
2036 AM53C974_write_8(FFREG
, cmd
->cmnd
[i
]);
2037 AM53C974_write_8(CMDREG
, CMDREG_SA3S
); /* select with ATN, 3 msg bytes */
2038 hostdata
->msgout
[0] = NOP
;
2041 AM53C974_write_8(CMDREG
, CMDREG_SASS
); /* select with ATN, stop steps; continue in message out phase */
2046 /**************************************************************************
2047 * Function : AM53C974_intr_select(struct Scsi_Host *instance, unsigned char statreg)
2049 * Purpose : handle reselection
2051 * Inputs : instance -- which AM53C974
2052 * statreg -- status register
2056 * side effects: manipulates hostdata
2057 **************************************************************************/
2058 static void AM53C974_intr_reselect(struct Scsi_Host
*instance
, unsigned char statreg
)
2060 AM53C974_local_declare();
2061 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
2062 unsigned char cfifo
, msg
[3], lun
, t
, target
= 0;
2066 Scsi_Cmnd
*tmp
= NULL
, *prev
;
2067 AM53C974_setio(instance
);
2069 cfifo
= AM53C974_cfifo();
2071 if (hostdata
->selecting
) {
2072 /* caught reselect interrupt in selection process;
2073 put selecting command back into the issue queue and continue with the
2074 reselecting command */
2075 DEB_RESEL(printk("AM53C974_intr_reselect: in selection process\n"));
2076 LIST(hostdata
->sel_cmd
, hostdata
->issue_queue
);
2077 hostdata
->sel_cmd
->host_scribble
= (unsigned char *) hostdata
->issue_queue
;
2078 hostdata
->issue_queue
= hostdata
->sel_cmd
;
2079 hostdata
->sel_cmd
= NULL
;
2080 hostdata
->selecting
= 0;
2082 /* 2 bytes must be in the FIFO now */
2084 printk("scsi %d: error: %d bytes in fifo, 2 expected\n", instance
->host_no
, cfifo
);
2085 hostdata
->aborted
= 1;
2088 /* determine target which reselected */
2089 t
= AM53C974_read_8(FFREG
);
2090 if (!(t
& (1 << instance
->this_id
))) {
2091 printk("scsi %d: error: invalid host id\n", instance
->host_no
);
2092 hostdata
->aborted
= 1;
2095 t
^= (1 << instance
->this_id
);
2101 DEB_RESEL(printk("scsi %d: reselect; target: %d\n", instance
->host_no
, target
));
2103 if (hostdata
->aborted
)
2106 if ((statreg
& STATREG_PHASE
) != PHASE_MSGIN
) {
2107 printk("scsi %d: error: upon reselection interrupt not in MSGIN\n", instance
->host_no
);
2108 hostdata
->aborted
= 1;
2111 msg
[0] = AM53C974_read_8(FFREG
);
2112 if (!msg
[0] & 0x80) {
2113 printk("scsi%d: error: expecting IDENTIFY message, got ", instance
->host_no
);
2115 hostdata
->aborted
= 1;
2118 lun
= (msg
[0] & 0x07);
2120 /* We need to add code for SCSI-II to track which devices have
2121 * I_T_L_Q nexuses established, and which have simple I_T_L
2122 * nexuses so we can chose to do additional data transfer. */
2124 #error "SCSI-II tagged queueing is not supported yet"
2127 /* Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2128 * just reestablished, and remove it from the disconnected queue. */
2129 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
, prev
= NULL
;
2130 tmp
; prev
= tmp
, tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
)
2131 if ((target
== tmp
->target
) && (lun
== tmp
->lun
)
2133 && (tag
== tmp
->tag
)
2137 REMOVE(prev
, (Scsi_Cmnd
*) (prev
->host_scribble
), tmp
,
2138 (Scsi_Cmnd
*) (tmp
->host_scribble
));
2139 prev
->host_scribble
= tmp
->host_scribble
;
2141 REMOVE(-1, hostdata
->disconnected_queue
, tmp
, tmp
->host_scribble
);
2142 hostdata
->disconnected_queue
= (Scsi_Cmnd
*) tmp
->host_scribble
;
2144 tmp
->host_scribble
= NULL
;
2145 hostdata
->connected
= tmp
;
2150 printk("scsi%d: warning : target %d lun %d tag %d not in disconnect_queue.\n",
2151 instance
->host_no
, target
, lun
, tag
);
2153 printk("scsi%d: warning : target %d lun %d not in disconnect_queue.\n",
2154 instance
->host_no
, target
, lun
);
2156 /* Since we have an established nexus that we can't do anything with, we must abort it. */
2157 hostdata
->aborted
= 1;
2158 DEB(AM53C974_keywait());
2164 AM53C974_write_8(CMDREG
, CMDREG_SATN
);
2165 AM53C974_write_8(CMDREG
, CMDREG_MA
);
2169 DEB_RESEL(printk("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2170 instance
->host_no
, target
, tmp
->lun
, tmp
->tag
));
2171 AM53C974_set_sync(instance
, target
);
2172 AM53C974_write_8(SDIDREG
, SDIREG_MASK
& target
); /* setup dest. id */
2173 AM53C974_write_8(CMDREG
, CMDREG_MA
);
2174 hostdata
->dma_busy
= 0;
2175 hostdata
->connected
->SCp
.phase
= PHASE_CMDOUT
;
2178 /**************************************************************************
2179 * Function : AM53C974_transfer_dma(struct Scsi_Host *instance, short dir,
2180 * unsigned long length, char *data)
2182 * Purpose : setup DMA transfer
2184 * Inputs : instance -- which AM53C974
2185 * dir -- direction flag, 0: write to device, read from memory;
2186 * 1: read from device, write to memory
2187 * length -- number of bytes to transfer to from buffer
2188 * data -- pointer to data buffer
2191 **************************************************************************/
2192 static __inline__
void AM53C974_transfer_dma(struct Scsi_Host
*instance
, short dir
,
2193 unsigned long length
, char *data
)
2195 AM53C974_local_declare();
2196 AM53C974_setio(instance
);
2198 AM53C974_write_8(CMDREG
, CMDREG_NOP
);
2199 AM53C974_write_8(DMACMD
, (dir
<< 7) | DMACMD_INTE_D
); /* idle command */
2200 AM53C974_write_8(STCLREG
, (unsigned char) (length
& 0xff));
2201 AM53C974_write_8(STCMREG
, (unsigned char) ((length
& 0xff00) >> 8));
2202 AM53C974_write_8(STCHREG
, (unsigned char) ((length
& 0xff0000) >> 16));
2203 AM53C974_write_32(DMASTC
, length
& 0xffffff);
2204 AM53C974_write_32(DMASPA
, virt_to_bus(data
));
2205 AM53C974_write_8(CMDREG
, CMDREG_IT
| CMDREG_DMA
);
2206 AM53C974_write_8(DMACMD
, (dir
<< 7) | DMACMD_INTE_D
| DMACMD_START
);
2209 /**************************************************************************
2210 * Function : AM53C974_dma_blast(struct Scsi_Host *instance, unsigned char dmastatus,
2211 * unsigned char statreg)
2213 * Purpose : cleanup DMA transfer
2215 * Inputs : instance -- which AM53C974
2216 * dmastatus -- dma status register
2217 * statreg -- status register
2220 **************************************************************************/
2221 static void AM53C974_dma_blast(struct Scsi_Host
*instance
, unsigned char dmastatus
,
2222 unsigned char statreg
)
2224 AM53C974_local_declare();
2225 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
2226 unsigned long ctcreg
;
2227 int dir
= statreg
& STATREG_IO
;
2228 int cfifo
, pio
, i
= 0;
2229 AM53C974_setio(instance
);
2232 cfifo
= AM53C974_cfifo();
2234 } while (cfifo
&& (i
< 50000));
2235 pio
= (i
== 50000) ? 1 : 0;
2237 if (statreg
& STATREG_CTZ
) {
2238 AM53C974_write_8(DMACMD
, DMACMD_IDLE
);
2241 if (dmastatus
& DMASTATUS_DONE
) {
2242 AM53C974_write_8(DMACMD
, DMACMD_IDLE
);
2245 AM53C974_write_8(DMACMD
, ((dir
<< 7) & DMACMD_DIR
) | DMACMD_BLAST
);
2246 while (!(AM53C974_read_8(DMASTATUS
) & DMASTATUS_BCMPLT
));
2247 AM53C974_write_8(DMACMD
, DMACMD_IDLE
);
2250 /* transfer residual bytes via PIO */
2251 unsigned char *wac
= (unsigned char *) AM53C974_read_32(DMAWAC
);
2252 printk("pio mode, residual=%d\n", AM53C974_read_8(CFIREG
) & CFIREG_CF
);
2253 while (AM53C974_read_8(CFIREG
) & CFIREG_CF
)
2254 *(wac
++) = AM53C974_read_8(FFREG
);
2256 ctcreg
= AM53C974_read_8(CTCLREG
) | (AM53C974_read_8(CTCMREG
) << 8) |
2257 (AM53C974_read_8(CTCHREG
) << 16);
2259 hostdata
->connected
->SCp
.ptr
+= hostdata
->connected
->SCp
.this_residual
- ctcreg
;
2260 hostdata
->connected
->SCp
.this_residual
= ctcreg
;
2263 /**************************************************************************
2264 * Function : AM53C974_intr_bus_reset(struct Scsi_Host *instance)
2266 * Purpose : handle bus reset interrupt
2268 * Inputs : instance -- which AM53C974
2271 **************************************************************************/
2272 static void AM53C974_intr_bus_reset(struct Scsi_Host
*instance
)
2274 AM53C974_local_declare();
2275 unsigned char cntlreg1
;
2276 AM53C974_setio(instance
);
2278 AM53C974_write_8(CMDREG
, CMDREG_CFIFO
);
2279 AM53C974_write_8(CMDREG
, CMDREG_NOP
);
2281 cntlreg1
= AM53C974_read_8(CNTLREG1
);
2282 AM53C974_write_8(CNTLREG1
, cntlreg1
| CNTLREG1_DISR
);
2285 /**************************************************************************
2286 * Function : int AM53C974_abort(Scsi_Cmnd *cmd)
2288 * Purpose : abort a command
2290 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2291 * host byte of the result field to, if zero DID_ABORTED is
2294 * Returns : 0 - success, -1 on failure.
2295 **************************************************************************/
2296 int AM53C974_abort(Scsi_Cmnd
* cmd
)
2298 AM53C974_local_declare();
2299 unsigned long flags
;
2300 struct Scsi_Host
*instance
= cmd
->host
;
2301 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
2302 Scsi_Cmnd
*tmp
, **prev
;
2304 #ifdef AM53C974_DEBUG
2309 AM53C974_setio(instance
);
2311 DEB_ABORT(printk(SEPARATOR_LINE
));
2312 DEB_ABORT(printk("scsi%d : AM53C974_abort called -- trouble starts!!\n", instance
->host_no
));
2313 DEB_ABORT(AM53C974_print(instance
));
2314 DEB_ABORT(AM53C974_keywait());
2316 /* Case 1 : If the command is the currently executing command,
2317 we'll set the aborted flag and return control so that the
2318 information transfer routine can exit cleanly. */
2319 if ((hostdata
->connected
== cmd
) || (hostdata
->sel_cmd
== cmd
)) {
2320 DEB_ABORT(printk("scsi%d: aborting connected command\n", instance
->host_no
));
2321 hostdata
->aborted
= 1;
2322 hostdata
->msgout
[0] = ABORT
;
2323 restore_flags(flags
);
2324 return (SCSI_ABORT_PENDING
);
2326 /* Case 2 : If the command hasn't been issued yet,
2327 we simply remove it from the issue queue. */
2328 for (prev
= (Scsi_Cmnd
**) & (hostdata
->issue_queue
),
2329 tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
; tmp
;
2330 prev
= (Scsi_Cmnd
**) & (tmp
->host_scribble
),
2331 tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
) {
2333 DEB_ABORT(printk("scsi%d : abort removed command from issue queue.\n", instance
->host_no
));
2334 REMOVE(5, *prev
, tmp
, tmp
->host_scribble
);
2335 (*prev
) = (Scsi_Cmnd
*) tmp
->host_scribble
;
2336 tmp
->host_scribble
= NULL
;
2337 tmp
->result
= DID_ABORT
<< 16;
2338 restore_flags(flags
);
2340 return (SCSI_ABORT_SUCCESS
);
2342 #ifdef AM53C974_DEBUG_ABORT
2344 if (prev
== (Scsi_Cmnd
**) tmp
)
2345 printk("scsi%d : LOOP\n", instance
->host_no
);
2350 /* Case 3 : If any commands are connected, we're going to fail the abort
2351 * and let the high level SCSI driver retry at a later time or
2354 * Timeouts, and therefore aborted commands, will be highly unlikely
2355 * and handling them cleanly in this situation would make the common
2356 * case of noresets less efficient, and would pollute our code. So,
2358 if (hostdata
->connected
|| hostdata
->sel_cmd
) {
2359 DEB_ABORT(printk("scsi%d : abort failed, other command connected.\n", instance
->host_no
));
2360 restore_flags(flags
);
2361 return (SCSI_ABORT_NOT_RUNNING
);
2363 /* Case 4: If the command is currently disconnected from the bus, and
2364 * there are no connected commands, we reconnect the I_T_L or
2365 * I_T_L_Q nexus associated with it, go into message out, and send
2366 * an abort message. */
2367 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; tmp
;
2368 tmp
= (Scsi_Cmnd
*) tmp
->host_scribble
) {
2370 DEB_ABORT(printk("scsi%d: aborting disconnected command\n", instance
->host_no
));
2371 hostdata
->aborted
= 1;
2372 hostdata
->msgout
[0] = ABORT
;
2373 hostdata
->selecting
= 1;
2374 hostdata
->sel_cmd
= tmp
;
2375 AM53C974_write_8(CMDREG
, CMDREG_DSR
);
2376 restore_flags(flags
);
2377 return (SCSI_ABORT_PENDING
);
2381 /* Case 5 : If we reached this point, the command was not found in any of
2384 * We probably reached this point because of an unlikely race condition
2385 * between the command completing successfully and the abortion code,
2386 * so we won't panic, but we will notify the user in case something really
2388 DEB_ABORT(printk("scsi%d : abort failed, command not found.\n", instance
->host_no
));
2389 restore_flags(flags
);
2390 return (SCSI_ABORT_NOT_RUNNING
);
2393 /**************************************************************************
2394 * Function : int AM53C974_reset(Scsi_Cmnd *cmd)
2396 * Purpose : reset the SCSI controller and bus
2398 * Inputs : cmd -- which command within the command block was responsible for the reset
2400 * Returns : status (SCSI_ABORT_SUCCESS)
2402 * FIXME(eric) the reset_flags are ignored.
2403 **************************************************************************/
2404 int AM53C974_reset(Scsi_Cmnd
* cmd
, unsigned int reset_flags
)
2406 AM53C974_local_declare();
2407 unsigned long flags
;
2409 struct Scsi_Host
*instance
= cmd
->host
;
2410 struct AM53C974_hostdata
*hostdata
= (struct AM53C974_hostdata
*) instance
->hostdata
;
2411 AM53C974_setio(instance
);
2415 DEB(printk("AM53C974_reset called; "));
2417 printk("AM53C974_reset called\n");
2418 AM53C974_print(instance
);
2422 AM53C974_write_8(CMDREG
, CMDREG_RDEV
);
2423 AM53C974_write_8(CMDREG
, CMDREG_NOP
);
2424 hostdata
->msgout
[0] = NOP
;
2425 for (i
= 0; i
< 8; i
++) {
2426 hostdata
->busy
[i
] = 0;
2427 hostdata
->sync_per
[i
] = DEF_STP
;
2428 hostdata
->sync_off
[i
] = 0;
2429 hostdata
->sync_neg
[i
] = 0;
2431 hostdata
->last_message
[0] = NOP
;
2432 hostdata
->sel_cmd
= NULL
;
2433 hostdata
->connected
= NULL
;
2434 hostdata
->issue_queue
= NULL
;
2435 hostdata
->disconnected_queue
= NULL
;
2436 hostdata
->in_reset
= 0;
2437 hostdata
->aborted
= 0;
2438 hostdata
->selecting
= 0;
2439 hostdata
->disconnecting
= 0;
2440 hostdata
->dma_busy
= 0;
2443 AM53C974_write_8(CNTLREG1
, CNTLREG1_DISR
| instance
->this_id
); /* disable interrupt upon SCSI RESET */
2444 AM53C974_write_8(CMDREG
, CMDREG_RBUS
); /* reset SCSI bus */
2446 AM53C974_config_after_reset(instance
);
2448 restore_flags(flags
);
2449 cmd
->result
= DID_RESET
<< 16;
2450 cmd
->scsi_done(cmd
);
2451 return SCSI_ABORT_SUCCESS
;
2456 * AM53C974_release()
2458 * Release resources allocated for a single AM53C974 adapter.
2460 int AM53C974_release(struct Scsi_Host
*shp
)
2462 free_irq(shp
->irq
, shp
);
2463 scsi_unregister(shp
);
2469 static Scsi_Host_Template driver_template
= AM53C974
;
2471 /* You can specify overrides=a,b,c,d in the same format at AM53C974=a,b,c,d
2474 MODULE_PARM(overrides
, "1-32i");
2475 #include "scsi_module.c"