Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

Linux/drivers/scsi/initio.c

  1 /**************************************************************************
  2  * Initio 9100 device driver for Linux.
  3  *
  4  * Copyright (c) 1994-1998 Initio Corporation
  5  * Copyright (c) 1998 Bas Vermeulen <bvermeul@blackstar.xs4all.nl>
  6  * Copyright (c) 2004 Christoph Hellwig <hch@lst.de>
  7  * Copyright (c) 2007 Red Hat
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License as published by
 11  * the Free Software Foundation; either version 2, or (at your option)
 12  * any later version.
 13  *
 14  * This program is distributed in the hope that it will be useful,
 15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  * GNU General Public License for more details.
 18  *
 19  * You should have received a copy of the GNU General Public License
 20  * along with this program; see the file COPYING.  If not, write to
 21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 22  *
 23  *
 24  *************************************************************************
 25  *
 26  * DESCRIPTION:
 27  *
 28  * This is the Linux low-level SCSI driver for Initio INI-9X00U/UW SCSI host
 29  * adapters
 30  *
 31  * 08/06/97 hc  - v1.01h
 32  *              - Support inic-940 and inic-935
 33  * 09/26/97 hc  - v1.01i
 34  *              - Make correction from J.W. Schultz suggestion
 35  * 10/13/97 hc  - Support reset function
 36  * 10/21/97 hc  - v1.01j
 37  *              - Support 32 LUN (SCSI 3)
 38  * 01/14/98 hc  - v1.01k
 39  *              - Fix memory allocation problem
 40  * 03/04/98 hc  - v1.01l
 41  *              - Fix tape rewind which will hang the system problem
 42  *              - Set can_queue to initio_num_scb
 43  * 06/25/98 hc  - v1.01m
 44  *              - Get it work for kernel version >= 2.1.75
 45  *              - Dynamic assign SCSI bus reset holding time in initio_init()
 46  * 07/02/98 hc  - v1.01n
 47  *              - Support 0002134A
 48  * 08/07/98 hc  - v1.01o
 49  *              - Change the initio_abort_srb routine to use scsi_done. <01>
 50  * 09/07/98 hl  - v1.02
 51  *              - Change the INI9100U define and proc_dir_entry to
 52  *                reflect the newer Kernel 2.1.118, but the v1.o1o
 53  *                should work with Kernel 2.1.118.
 54  * 09/20/98 wh  - v1.02a
 55  *              - Support Abort command.
 56  *              - Handle reset routine.
 57  * 09/21/98 hl  - v1.03
 58  *              - remove comments.
 59  * 12/09/98 bv  - v1.03a
 60  *              - Removed unused code
 61  * 12/13/98 bv  - v1.03b
 62  *              - Remove cli() locking for kernels >= 2.1.95. This uses
 63  *                spinlocks to serialize access to the pSRB_head and
 64  *                pSRB_tail members of the HCS structure.
 65  * 09/01/99 bv  - v1.03d
 66  *              - Fixed a deadlock problem in SMP.
 67  * 21/01/99 bv  - v1.03e
 68  *              - Add support for the Domex 3192U PCI SCSI
 69  *                This is a slightly modified patch by
 70  *                Brian Macy <bmacy@sunshinecomputing.com>
 71  * 22/02/99 bv  - v1.03f
 72  *              - Didn't detect the INIC-950 in 2.0.x correctly.
 73  *                Now fixed.
 74  * 05/07/99 bv  - v1.03g
 75  *              - Changed the assumption that HZ = 100
 76  * 10/17/03 mc  - v1.04
 77  *              - added new DMA API support
 78  * 06/01/04 jmd - v1.04a
 79  *              - Re-add reset_bus support
 80  **************************************************************************/
 81 
 82 #include <linux/module.h>
 83 #include <linux/errno.h>
 84 #include <linux/delay.h>
 85 #include <linux/pci.h>
 86 #include <linux/init.h>
 87 #include <linux/blkdev.h>
 88 #include <linux/spinlock.h>
 89 #include <linux/stat.h>
 90 #include <linux/kernel.h>
 91 #include <linux/proc_fs.h>
 92 #include <linux/string.h>
 93 #include <linux/interrupt.h>
 94 #include <linux/ioport.h>
 95 #include <linux/slab.h>
 96 #include <linux/jiffies.h>
 97 #include <linux/dma-mapping.h>
 98 #include <asm/io.h>
 99 
100 #include <scsi/scsi.h>
101 #include <scsi/scsi_cmnd.h>
102 #include <scsi/scsi_device.h>
103 #include <scsi/scsi_host.h>
104 #include <scsi/scsi_tcq.h>
105 
106 #include "initio.h"
107 
108 #define SENSE_SIZE              14
109 
110 #define i91u_MAXQUEUE           2
111 #define i91u_REVID "Initio INI-9X00U/UW SCSI device driver; Revision: 1.04a"
112 
113 #ifdef DEBUG_i91u
114 static unsigned int i91u_debug = DEBUG_DEFAULT;
115 #endif
116 
117 static int initio_tag_enable = 1;
118 
119 #ifdef DEBUG_i91u
120 static int setup_debug = 0;
121 #endif
122 
123 static void i91uSCBPost(u8 * pHcb, u8 * pScb);
124 
125 #define DEBUG_INTERRUPT 0
126 #define DEBUG_QUEUE     0
127 #define DEBUG_STATE     0
128 #define INT_DISC        0
129 
130 /*--- forward references ---*/
131 static struct scsi_ctrl_blk *initio_find_busy_scb(struct initio_host * host, u16 tarlun);
132 static struct scsi_ctrl_blk *initio_find_done_scb(struct initio_host * host);
133 
134 static int tulip_main(struct initio_host * host);
135 
136 static int initio_next_state(struct initio_host * host);
137 static int initio_state_1(struct initio_host * host);
138 static int initio_state_2(struct initio_host * host);
139 static int initio_state_3(struct initio_host * host);
140 static int initio_state_4(struct initio_host * host);
141 static int initio_state_5(struct initio_host * host);
142 static int initio_state_6(struct initio_host * host);
143 static int initio_state_7(struct initio_host * host);
144 static int initio_xfer_data_in(struct initio_host * host);
145 static int initio_xfer_data_out(struct initio_host * host);
146 static int initio_xpad_in(struct initio_host * host);
147 static int initio_xpad_out(struct initio_host * host);
148 static int initio_status_msg(struct initio_host * host);
149 
150 static int initio_msgin(struct initio_host * host);
151 static int initio_msgin_sync(struct initio_host * host);
152 static int initio_msgin_accept(struct initio_host * host);
153 static int initio_msgout_reject(struct initio_host * host);
154 static int initio_msgin_extend(struct initio_host * host);
155 
156 static int initio_msgout_ide(struct initio_host * host);
157 static int initio_msgout_abort_targ(struct initio_host * host);
158 static int initio_msgout_abort_tag(struct initio_host * host);
159 
160 static int initio_bus_device_reset(struct initio_host * host);
161 static void initio_select_atn(struct initio_host * host, struct scsi_ctrl_blk * scb);
162 static void initio_select_atn3(struct initio_host * host, struct scsi_ctrl_blk * scb);
163 static void initio_select_atn_stop(struct initio_host * host, struct scsi_ctrl_blk * scb);
164 static int int_initio_busfree(struct initio_host * host);
165 static int int_initio_scsi_rst(struct initio_host * host);
166 static int int_initio_bad_seq(struct initio_host * host);
167 static int int_initio_resel(struct initio_host * host);
168 static int initio_sync_done(struct initio_host * host);
169 static int wdtr_done(struct initio_host * host);
170 static int wait_tulip(struct initio_host * host);
171 static int initio_wait_done_disc(struct initio_host * host);
172 static int initio_wait_disc(struct initio_host * host);
173 static void tulip_scsi(struct initio_host * host);
174 static int initio_post_scsi_rst(struct initio_host * host);
175 
176 static void initio_se2_ew_en(unsigned long base);
177 static void initio_se2_ew_ds(unsigned long base);
178 static int initio_se2_rd_all(unsigned long base);
179 static void initio_se2_update_all(unsigned long base);  /* setup default pattern */
180 static void initio_read_eeprom(unsigned long base);
181 
182 /* ---- INTERNAL VARIABLES ---- */
183 
184 static NVRAM i91unvram;
185 static NVRAM *i91unvramp;
186 
187 static u8 i91udftNvRam[64] =
188 {
189         /*----------- header -----------*/
190         0x25, 0xc9,             /* Signature    */
191         0x40,                   /* Size         */
192         0x01,                   /* Revision     */
193         /* -- Host Adapter Structure -- */
194         0x95,                   /* ModelByte0   */
195         0x00,                   /* ModelByte1   */
196         0x00,                   /* ModelInfo    */
197         0x01,                   /* NumOfCh      */
198         NBC1_DEFAULT,           /* BIOSConfig1  */
199         0,                      /* BIOSConfig2  */
200         0,                      /* HAConfig1    */
201         0,                      /* HAConfig2    */
202         /* SCSI channel 0 and target Structure  */
203         7,                      /* SCSIid       */
204         NCC1_DEFAULT,           /* SCSIconfig1  */
205         0,                      /* SCSIconfig2  */
206         0x10,                   /* NumSCSItarget */
207 
208         NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
209         NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
210         NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
211         NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
212 
213         /* SCSI channel 1 and target Structure  */
214         7,                      /* SCSIid       */
215         NCC1_DEFAULT,           /* SCSIconfig1  */
216         0,                      /* SCSIconfig2  */
217         0x10,                   /* NumSCSItarget */
218 
219         NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
220         NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
221         NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
222         NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT, NTC_DEFAULT,
223         0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
224         0, 0};                  /*      - CheckSum -            */
225 
226 
227 static u8 initio_rate_tbl[8] =  /* fast 20      */
228 {
229                                 /* nanosecond divide by 4 */
230         12,                     /* 50ns,  20M   */
231         18,                     /* 75ns,  13.3M */
232         25,                     /* 100ns, 10M   */
233         31,                     /* 125ns, 8M    */
234         37,                     /* 150ns, 6.6M  */
235         43,                     /* 175ns, 5.7M  */
236         50,                     /* 200ns, 5M    */
237         62                      /* 250ns, 4M    */
238 };
239 
240 static void initio_do_pause(unsigned amount)
241 {
242         /* Pause for amount jiffies */
243         unsigned long the_time = jiffies + amount;
244 
245         while (time_before_eq(jiffies, the_time))
246                 cpu_relax();
247 }
248 
249 /*-- forward reference --*/
250 
251 /******************************************************************
252  Input: instruction for  Serial E2PROM
253 
254  EX: se2_rd(0 call se2_instr() to send address and read command
255 
256          StartBit  OP_Code   Address                Data
257          --------- --------  ------------------     -------
258          1         1 , 0     A5,A4,A3,A2,A1,A0      D15-D0
259 
260                  +-----------------------------------------------------
261                  |
262  CS -----+
263                         +--+  +--+  +--+  +--+  +--+
264                         ^  |  ^  |  ^  |  ^  |  ^  |
265                         |  |  |  |  |  |  |  |  |  |
266  CLK -------+  +--+  +--+  +--+  +--+  +--
267  (leading edge trigger)
268 
269                  +--1-----1--+
270                  | SB    OP  |  OP    A5    A4
271  DI  ----+           +--0------------------
272  (address and cmd sent to nvram)
273 
274          -------------------------------------------+
275                                                                                                 |
276  DO                                             +---
277  (data sent from nvram)
278 
279 
280 ******************************************************************/
281 
282 /**
283  *      initio_se2_instr        -       bitbang an instruction
284  *      @base: Base of InitIO controller
285  *      @instr: Instruction for serial E2PROM
286  *
287  *      Bitbang an instruction out to the serial E2Prom
288  */
289 
290 static void initio_se2_instr(unsigned long base, u8 instr)
291 {
292         int i;
293         u8 b;
294 
295         outb(SE2CS | SE2DO, base + TUL_NVRAM);          /* cs+start bit */
296         udelay(30);
297         outb(SE2CS | SE2CLK | SE2DO, base + TUL_NVRAM); /* +CLK */
298         udelay(30);
299 
300         for (i = 0; i < 8; i++) {
301                 if (instr & 0x80)
302                         b = SE2CS | SE2DO;              /* -CLK+dataBit */
303                 else
304                         b = SE2CS;                      /* -CLK */
305                 outb(b, base + TUL_NVRAM);
306                 udelay(30);
307                 outb(b | SE2CLK, base + TUL_NVRAM);     /* +CLK */
308                 udelay(30);
309                 instr <<= 1;
310         }
311         outb(SE2CS, base + TUL_NVRAM);                  /* -CLK */
312         udelay(30);
313 }
314 
315 
316 /**
317  *      initio_se2_ew_en        -       Enable erase/write
318  *      @base: Base address of InitIO controller
319  *
320  *      Enable erase/write state of serial EEPROM
321  */
322 void initio_se2_ew_en(unsigned long base)
323 {
324         initio_se2_instr(base, 0x30);   /* EWEN */
325         outb(0, base + TUL_NVRAM);      /* -CS  */
326         udelay(30);
327 }
328 
329 
330 /**
331  *      initio_se2_ew_ds        -       Disable erase/write
332  *      @base: Base address of InitIO controller
333  *
334  *      Disable erase/write state of serial EEPROM
335  */
336 void initio_se2_ew_ds(unsigned long base)
337 {
338         initio_se2_instr(base, 0);      /* EWDS */
339         outb(0, base + TUL_NVRAM);      /* -CS  */
340         udelay(30);
341 }
342 
343 
344 /**
345  *      initio_se2_rd           -       read E2PROM word
346  *      @base: Base of InitIO controller
347  *      @addr: Address of word in E2PROM
348  *
349  *      Read a word from the NV E2PROM device
350  */
351 static u16 initio_se2_rd(unsigned long base, u8 addr)
352 {
353         u8 instr, rb;
354         u16 val = 0;
355         int i;
356 
357         instr = (u8) (addr | 0x80);
358         initio_se2_instr(base, instr);  /* READ INSTR */
359 
360         for (i = 15; i >= 0; i--) {
361                 outb(SE2CS | SE2CLK, base + TUL_NVRAM); /* +CLK */
362                 udelay(30);
363                 outb(SE2CS, base + TUL_NVRAM);          /* -CLK */
364 
365                 /* sample data after the following edge of clock  */
366                 rb = inb(base + TUL_NVRAM);
367                 rb &= SE2DI;
368                 val += (rb << i);
369                 udelay(30);     /* 6/20/95 */
370         }
371 
372         outb(0, base + TUL_NVRAM);              /* no chip select */
373         udelay(30);
374         return val;
375 }
376 
377 /**
378  *      initio_se2_wr           -       read E2PROM word
379  *      @base: Base of InitIO controller
380  *      @addr: Address of word in E2PROM
381  *      @val: Value to write
382  *
383  *      Write a word to the NV E2PROM device. Used when recovering from
384  *      a problem with the NV.
385  */
386 static void initio_se2_wr(unsigned long base, u8 addr, u16 val)
387 {
388         u8 rb;
389         u8 instr;
390         int i;
391 
392         instr = (u8) (addr | 0x40);
393         initio_se2_instr(base, instr);  /* WRITE INSTR */
394         for (i = 15; i >= 0; i--) {
395                 if (val & 0x8000)
396                         outb(SE2CS | SE2DO, base + TUL_NVRAM);  /* -CLK+dataBit 1 */
397                 else
398                         outb(SE2CS, base + TUL_NVRAM);          /* -CLK+dataBit 0 */
399                 udelay(30);
400                 outb(SE2CS | SE2CLK, base + TUL_NVRAM);         /* +CLK */
401                 udelay(30);
402                 val <<= 1;
403         }
404         outb(SE2CS, base + TUL_NVRAM);                          /* -CLK */
405         udelay(30);
406         outb(0, base + TUL_NVRAM);                              /* -CS  */
407         udelay(30);
408 
409         outb(SE2CS, base + TUL_NVRAM);                          /* +CS  */
410         udelay(30);
411 
412         for (;;) {
413                 outb(SE2CS | SE2CLK, base + TUL_NVRAM);         /* +CLK */
414                 udelay(30);
415                 outb(SE2CS, base + TUL_NVRAM);                  /* -CLK */
416                 udelay(30);
417                 if ((rb = inb(base + TUL_NVRAM)) & SE2DI)
418                         break;  /* write complete */
419         }
420         outb(0, base + TUL_NVRAM);                              /* -CS */
421 }
422 
423 /**
424  *      initio_se2_rd_all       -       read hostadapter NV configuration
425  *      @base: Base address of InitIO controller
426  *
427  *      Reads the E2PROM data into main memory. Ensures that the checksum
428  *      and header marker are valid. Returns 1 on success -1 on error.
429  */
430 
431 static int initio_se2_rd_all(unsigned long base)
432 {
433         int i;
434         u16 chksum = 0;
435         u16 *np;
436 
437         i91unvramp = &i91unvram;
438         np = (u16 *) i91unvramp;
439         for (i = 0; i < 32; i++)
440                 *np++ = initio_se2_rd(base, i);
441 
442         /* Is signature "ini" ok ? */
443         if (i91unvramp->NVM_Signature != INI_SIGNATURE)
444                 return -1;
445         /* Is ckecksum ok ? */
446         np = (u16 *) i91unvramp;
447         for (i = 0; i < 31; i++)
448                 chksum += *np++;
449         if (i91unvramp->NVM_CheckSum != chksum)
450                 return -1;
451         return 1;
452 }
453 
454 /**
455  *      initio_se2_update_all           -       Update E2PROM
456  *      @base: Base of InitIO controller
457  *
458  *      Update the E2PROM by wrting any changes into the E2PROM
459  *      chip, rewriting the checksum.
460  */
461 static void initio_se2_update_all(unsigned long base)
462 {                               /* setup default pattern */
463         int i;
464         u16 chksum = 0;
465         u16 *np, *np1;
466 
467         i91unvramp = &i91unvram;
468         /* Calculate checksum first */
469         np = (u16 *) i91udftNvRam;
470         for (i = 0; i < 31; i++)
471                 chksum += *np++;
472         *np = chksum;
473         initio_se2_ew_en(base); /* Enable write  */
474 
475         np = (u16 *) i91udftNvRam;
476         np1 = (u16 *) i91unvramp;
477         for (i = 0; i < 32; i++, np++, np1++) {
478                 if (*np != *np1)
479                         initio_se2_wr(base, i, *np);
480         }
481         initio_se2_ew_ds(base); /* Disable write   */
482 }
483 
484 /**
485  *      initio_read_eeprom              -       Retrieve configuration
486  *      @base: Base of InitIO Host Adapter
487  *
488  *      Retrieve the host adapter configuration data from E2Prom. If the
489  *      data is invalid then the defaults are used and are also restored
490  *      into the E2PROM. This forms the access point for the SCSI driver
491  *      into the E2PROM layer, the other functions for the E2PROM are all
492  *      internal use.
493  *
494  *      Must be called single threaded, uses a shared global area.
495  */
496 
497 static void initio_read_eeprom(unsigned long base)
498 {
499         u8 gctrl;
500 
501         i91unvramp = &i91unvram;
502         /* Enable EEProm programming */
503         gctrl = inb(base + TUL_GCTRL);
504         outb(gctrl | TUL_GCTRL_EEPROM_BIT, base + TUL_GCTRL);
505         if (initio_se2_rd_all(base) != 1) {
506                 initio_se2_update_all(base);    /* setup default pattern */
507                 initio_se2_rd_all(base);        /* load again  */
508         }
509         /* Disable EEProm programming */
510         gctrl = inb(base + TUL_GCTRL);
511         outb(gctrl & ~TUL_GCTRL_EEPROM_BIT, base + TUL_GCTRL);
512 }
513 
514 /**
515  *      initio_stop_bm          -       stop bus master
516  *      @host: InitIO we are stopping
517  *
518  *      Stop any pending DMA operation, aborting the DMA if necessary
519  */
520 
521 static void initio_stop_bm(struct initio_host * host)
522 {
523 
524         if (inb(host->addr + TUL_XStatus) & XPEND) {    /* if DMA xfer is pending, abort DMA xfer */
525                 outb(TAX_X_ABT | TAX_X_CLR_FIFO, host->addr + TUL_XCmd);
526                 /* wait Abort DMA xfer done */
527                 while ((inb(host->addr + TUL_Int) & XABT) == 0)
528                         cpu_relax();
529         }
530         outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
531 }
532 
533 /**
534  *      initio_reset_scsi               -       Reset SCSI host controller
535  *      @host: InitIO host to reset
536  *      @seconds: Recovery time
537  *
538  *      Perform a full reset of the SCSI subsystem.
539  */
540 
541 static int initio_reset_scsi(struct initio_host * host, int seconds)
542 {
543         outb(TSC_RST_BUS, host->addr + TUL_SCtrl0);
544 
545         while (!((host->jsint = inb(host->addr + TUL_SInt)) & TSS_SCSIRST_INT))
546                 cpu_relax();
547 
548         /* reset tulip chip */
549         outb(0, host->addr + TUL_SSignal);
550 
551         /* Stall for a while, wait for target's firmware ready,make it 2 sec ! */
552         /* SONY 5200 tape drive won't work if only stall for 1 sec */
553         /* FIXME: this is a very long busy wait right now */
554         initio_do_pause(seconds * HZ);
555 
556         inb(host->addr + TUL_SInt);
557         return SCSI_RESET_SUCCESS;
558 }
559 
560 /**
561  *      initio_init             -       set up an InitIO host adapter
562  *      @host: InitIO host adapter
563  *      @num_scbs: Number of SCBS
564  *      @bios_addr: BIOS address
565  *
566  *      Set up the host adapter and devices according to the configuration
567  *      retrieved from the E2PROM.
568  *
569  *      Locking: Calls E2PROM layer code which is not re-enterable so must
570  *      run single threaded for now.
571  */
572 
573 static void initio_init(struct initio_host * host, u8 *bios_addr)
574 {
575         int i;
576         u8 *flags;
577         u8 *heads;
578 
579         /* Get E2Prom configuration */
580         initio_read_eeprom(host->addr);
581         if (i91unvramp->NVM_SCSIInfo[0].NVM_NumOfTarg == 8)
582                 host->max_tar = 8;
583         else
584                 host->max_tar = 16;
585 
586         host->config = i91unvramp->NVM_SCSIInfo[0].NVM_ChConfig1;
587 
588         host->scsi_id = i91unvramp->NVM_SCSIInfo[0].NVM_ChSCSIID;
589         host->idmask = ~(1 << host->scsi_id);
590 
591 #ifdef CHK_PARITY
592         /* Enable parity error response */
593         outb(inb(host->addr + TUL_PCMD) | 0x40, host->addr + TUL_PCMD);
594 #endif
595 
596         /* Mask all the interrupt       */
597         outb(0x1F, host->addr + TUL_Mask);
598 
599         initio_stop_bm(host);
600         /* --- Initialize the tulip --- */
601         outb(TSC_RST_CHIP, host->addr + TUL_SCtrl0);
602 
603         /* program HBA's SCSI ID        */
604         outb(host->scsi_id << 4, host->addr + TUL_SScsiId);
605 
606         /* Enable Initiator Mode ,phase latch,alternate sync period mode,
607            disable SCSI reset */
608         if (host->config & HCC_EN_PAR)
609                 host->sconf1 = (TSC_INITDEFAULT | TSC_EN_SCSI_PAR);
610         else
611                 host->sconf1 = (TSC_INITDEFAULT);
612         outb(host->sconf1, host->addr + TUL_SConfig);
613 
614         /* Enable HW reselect */
615         outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1);
616 
617         outb(0, host->addr + TUL_SPeriod);
618 
619         /* selection time out = 250 ms */
620         outb(153, host->addr + TUL_STimeOut);
621 
622         /* Enable SCSI terminator */
623         outb((host->config & (HCC_ACT_TERM1 | HCC_ACT_TERM2)),
624                 host->addr + TUL_XCtrl);
625         outb(((host->config & HCC_AUTO_TERM) >> 4) |
626                 (inb(host->addr + TUL_GCTRL1) & 0xFE),
627                 host->addr + TUL_GCTRL1);
628 
629         for (i = 0,
630              flags = & (i91unvramp->NVM_SCSIInfo[0].NVM_Targ0Config),
631              heads = bios_addr + 0x180;
632              i < host->max_tar;
633              i++, flags++) {
634                 host->targets[i].flags = *flags & ~(TCF_SYNC_DONE | TCF_WDTR_DONE);
635                 if (host->targets[i].flags & TCF_EN_255)
636                         host->targets[i].drv_flags = TCF_DRV_255_63;
637                 else
638                         host->targets[i].drv_flags = 0;
639                 host->targets[i].js_period = 0;
640                 host->targets[i].sconfig0 = host->sconf1;
641                 host->targets[i].heads = *heads++;
642                 if (host->targets[i].heads == 255)
643                         host->targets[i].drv_flags = TCF_DRV_255_63;
644                 else
645                         host->targets[i].drv_flags = 0;
646                 host->targets[i].sectors = *heads++;
647                 host->targets[i].flags &= ~TCF_BUSY;
648                 host->act_tags[i] = 0;
649                 host->max_tags[i] = 0xFF;
650         }                       /* for                          */
651         printk("i91u: PCI Base=0x%04X, IRQ=%d, BIOS=0x%04X0, SCSI ID=%d\n",
652                host->addr, host->pci_dev->irq,
653                host->bios_addr, host->scsi_id);
654         /* Reset SCSI Bus */
655         if (host->config & HCC_SCSI_RESET) {
656                 printk(KERN_INFO "i91u: Reset SCSI Bus ... \n");
657                 initio_reset_scsi(host, 10);
658         }
659         outb(0x17, host->addr + TUL_SCFG1);
660         outb(0xE9, host->addr + TUL_SIntEnable);
661 }
662 
663 /**
664  *      initio_alloc_scb                -       Allocate an SCB
665  *      @host: InitIO host we are allocating for
666  *
667  *      Walk the SCB list for the controller and allocate a free SCB if
668  *      one exists.
669  */
670 static struct scsi_ctrl_blk *initio_alloc_scb(struct initio_host *host)
671 {
672         struct scsi_ctrl_blk *scb;
673         unsigned long flags;
674 
675         spin_lock_irqsave(&host->avail_lock, flags);
676         if ((scb = host->first_avail) != NULL) {
677 #if DEBUG_QUEUE
678                 printk("find scb at %p\n", scb);
679 #endif
680                 if ((host->first_avail = scb->next) == NULL)
681                         host->last_avail = NULL;
682                 scb->next = NULL;
683                 scb->status = SCB_RENT;
684         }
685         spin_unlock_irqrestore(&host->avail_lock, flags);
686         return scb;
687 }
688 
689 /**
690  *      initio_release_scb              -       Release an SCB
691  *      @host: InitIO host that owns the SCB
692  *      @cmnd: SCB command block being returned
693  *
694  *      Return an allocated SCB to the host free list
695  */
696 
697 static void initio_release_scb(struct initio_host * host, struct scsi_ctrl_blk * cmnd)
698 {
699         unsigned long flags;
700 
701 #if DEBUG_QUEUE
702         printk("Release SCB %p; ", cmnd);
703 #endif
704         spin_lock_irqsave(&(host->avail_lock), flags);
705         cmnd->srb = NULL;
706         cmnd->status = 0;
707         cmnd->next = NULL;
708         if (host->last_avail != NULL) {
709                 host->last_avail->next = cmnd;
710                 host->last_avail = cmnd;
711         } else {
712                 host->first_avail = cmnd;
713                 host->last_avail = cmnd;
714         }
715         spin_unlock_irqrestore(&(host->avail_lock), flags);
716 }
717 
718 /***************************************************************************/
719 static void initio_append_pend_scb(struct initio_host * host, struct scsi_ctrl_blk * scbp)
720 {
721 
722 #if DEBUG_QUEUE
723         printk("Append pend SCB %p; ", scbp);
724 #endif
725         scbp->status = SCB_PEND;
726         scbp->next = NULL;
727         if (host->last_pending != NULL) {
728                 host->last_pending->next = scbp;
729                 host->last_pending = scbp;
730         } else {
731                 host->first_pending = scbp;
732                 host->last_pending = scbp;
733         }
734 }
735 
736 /***************************************************************************/
737 static void initio_push_pend_scb(struct initio_host * host, struct scsi_ctrl_blk * scbp)
738 {
739 
740 #if DEBUG_QUEUE
741         printk("Push pend SCB %p; ", scbp);
742 #endif
743         scbp->status = SCB_PEND;
744         if ((scbp->next = host->first_pending) != NULL) {
745                 host->first_pending = scbp;
746         } else {
747                 host->first_pending = scbp;
748                 host->last_pending = scbp;
749         }
750 }
751 
752 static struct scsi_ctrl_blk *initio_find_first_pend_scb(struct initio_host * host)
753 {
754         struct scsi_ctrl_blk *first;
755 
756 
757         first = host->first_pending;
758         while (first != NULL) {
759                 if (first->opcode != ExecSCSI)
760                         return first;
761                 if (first->tagmsg == 0) {
762                         if ((host->act_tags[first->target] == 0) &&
763                             !(host->targets[first->target].flags & TCF_BUSY))
764                                 return first;
765                 } else {
766                         if ((host->act_tags[first->target] >=
767                           host->max_tags[first->target]) |
768                             (host->targets[first->target].flags & TCF_BUSY)) {
769                                 first = first->next;
770                                 continue;
771                         }
772                         return first;
773                 }
774                 first = first->next;
775         }
776         return first;
777 }
778 
779 static void initio_unlink_pend_scb(struct initio_host * host, struct scsi_ctrl_blk * scb)
780 {
781         struct scsi_ctrl_blk *tmp, *prev;
782 
783 #if DEBUG_QUEUE
784         printk("unlink pend SCB %p; ", scb);
785 #endif
786 
787         prev = tmp = host->first_pending;
788         while (tmp != NULL) {
789                 if (scb == tmp) {       /* Unlink this SCB              */
790                         if (tmp == host->first_pending) {
791                                 if ((host->first_pending = tmp->next) == NULL)
792                                         host->last_pending = NULL;
793                         } else {
794                                 prev->next = tmp->next;
795                                 if (tmp == host->last_pending)
796                                         host->last_pending = prev;
797                         }
798                         tmp->next = NULL;
799                         break;
800                 }
801                 prev = tmp;
802                 tmp = tmp->next;
803         }
804 }
805 
806 static void initio_append_busy_scb(struct initio_host * host, struct scsi_ctrl_blk * scbp)
807 {
808 
809 #if DEBUG_QUEUE
810         printk("append busy SCB %p; ", scbp);
811 #endif
812         if (scbp->tagmsg)
813                 host->act_tags[scbp->target]++;
814         else
815                 host->targets[scbp->target].flags |= TCF_BUSY;
816         scbp->status = SCB_BUSY;
817         scbp->next = NULL;
818         if (host->last_busy != NULL) {
819                 host->last_busy->next = scbp;
820                 host->last_busy = scbp;
821         } else {
822                 host->first_busy = scbp;
823                 host->last_busy = scbp;
824         }
825 }
826 
827 /***************************************************************************/
828 static struct scsi_ctrl_blk *initio_pop_busy_scb(struct initio_host * host)
829 {
830         struct scsi_ctrl_blk *tmp;
831 
832 
833         if ((tmp = host->first_busy) != NULL) {
834                 if ((host->first_busy = tmp->next) == NULL)
835                         host->last_busy = NULL;
836                 tmp->next = NULL;
837                 if (tmp->tagmsg)
838                         host->act_tags[tmp->target]--;
839                 else
840                         host->targets[tmp->target].flags &= ~TCF_BUSY;
841         }
842 #if DEBUG_QUEUE
843         printk("Pop busy SCB %p; ", tmp);
844 #endif
845         return tmp;
846 }
847 
848 /***************************************************************************/
849 static void initio_unlink_busy_scb(struct initio_host * host, struct scsi_ctrl_blk * scb)
850 {
851         struct scsi_ctrl_blk *tmp, *prev;
852 
853 #if DEBUG_QUEUE
854         printk("unlink busy SCB %p; ", scb);
855 #endif
856 
857         prev = tmp = host->first_busy;
858         while (tmp != NULL) {
859                 if (scb == tmp) {       /* Unlink this SCB              */
860                         if (tmp == host->first_busy) {
861                                 if ((host->first_busy = tmp->next) == NULL)
862                                         host->last_busy = NULL;
863                         } else {
864                                 prev->next = tmp->next;
865                                 if (tmp == host->last_busy)
866                                         host->last_busy = prev;
867                         }
868                         tmp->next = NULL;
869                         if (tmp->tagmsg)
870                                 host->act_tags[tmp->target]--;
871                         else
872                                 host->targets[tmp->target].flags &= ~TCF_BUSY;
873                         break;
874                 }
875                 prev = tmp;
876                 tmp = tmp->next;
877         }
878         return;
879 }
880 
881 struct scsi_ctrl_blk *initio_find_busy_scb(struct initio_host * host, u16 tarlun)
882 {
883         struct scsi_ctrl_blk *tmp, *prev;
884         u16 scbp_tarlun;
885 
886 
887         prev = tmp = host->first_busy;
888         while (tmp != NULL) {
889                 scbp_tarlun = (tmp->lun << 8) | (tmp->target);
890                 if (scbp_tarlun == tarlun) {    /* Unlink this SCB              */
891                         break;
892                 }
893                 prev = tmp;
894                 tmp = tmp->next;
895         }
896 #if DEBUG_QUEUE
897         printk("find busy SCB %p; ", tmp);
898 #endif
899         return tmp;
900 }
901 
902 static void initio_append_done_scb(struct initio_host * host, struct scsi_ctrl_blk * scbp)
903 {
904 #if DEBUG_QUEUE
905         printk("append done SCB %p; ", scbp);
906 #endif
907 
908         scbp->status = SCB_DONE;
909         scbp->next = NULL;
910         if (host->last_done != NULL) {
911                 host->last_done->next = scbp;
912                 host->last_done = scbp;
913         } else {
914                 host->first_done = scbp;
915                 host->last_done = scbp;
916         }
917 }
918 
919 struct scsi_ctrl_blk *initio_find_done_scb(struct initio_host * host)
920 {
921         struct scsi_ctrl_blk *tmp;
922 
923         if ((tmp = host->first_done) != NULL) {
924                 if ((host->first_done = tmp->next) == NULL)
925                         host->last_done = NULL;
926                 tmp->next = NULL;
927         }
928 #if DEBUG_QUEUE
929         printk("find done SCB %p; ",tmp);
930 #endif
931         return tmp;
932 }
933 
934 static int initio_abort_srb(struct initio_host * host, struct scsi_cmnd *srbp)
935 {
936         unsigned long flags;
937         struct scsi_ctrl_blk *tmp, *prev;
938 
939         spin_lock_irqsave(&host->semaph_lock, flags);
940 
941         if ((host->semaph == 0) && (host->active == NULL)) {
942                 /* disable Jasmin SCSI Int        */
943                 outb(0x1F, host->addr + TUL_Mask);
944                 spin_unlock_irqrestore(&host->semaph_lock, flags);
945                 /* FIXME: synchronize_irq needed ? */
946                 tulip_main(host);
947                 spin_lock_irqsave(&host->semaph_lock, flags);
948                 host->semaph = 1;
949                 outb(0x0F, host->addr + TUL_Mask);
950                 spin_unlock_irqrestore(&host->semaph_lock, flags);
951                 return SCSI_ABORT_SNOOZE;
952         }
953         prev = tmp = host->first_pending;       /* Check Pend queue */
954         while (tmp != NULL) {
955                 /* 07/27/98 */
956                 if (tmp->srb == srbp) {
957                         if (tmp == host->active) {
958                                 spin_unlock_irqrestore(&host->semaph_lock, flags);
959                                 return SCSI_ABORT_BUSY;
960                         } else if (tmp == host->first_pending) {
961                                 if ((host->first_pending = tmp->next) == NULL)
962                                         host->last_pending = NULL;
963                         } else {
964                                 prev->next = tmp->next;
965                                 if (tmp == host->last_pending)
966                                         host->last_pending = prev;
967                         }
968                         tmp->hastat = HOST_ABORTED;
969                         tmp->flags |= SCF_DONE;
970                         if (tmp->flags & SCF_POST)
971                                 (*tmp->post) ((u8 *) host, (u8 *) tmp);
972                         spin_unlock_irqrestore(&host->semaph_lock, flags);
973                         return SCSI_ABORT_SUCCESS;
974                 }
975                 prev = tmp;
976                 tmp = tmp->next;
977         }
978 
979         prev = tmp = host->first_busy;  /* Check Busy queue */
980         while (tmp != NULL) {
981                 if (tmp->srb == srbp) {
982                         if (tmp == host->active) {
983                                 spin_unlock_irqrestore(&host->semaph_lock, flags);
984                                 return SCSI_ABORT_BUSY;
985                         } else if (tmp->tagmsg == 0) {
986                                 spin_unlock_irqrestore(&host->semaph_lock, flags);
987                                 return SCSI_ABORT_BUSY;
988                         } else {
989                                 host->act_tags[tmp->target]--;
990                                 if (tmp == host->first_busy) {
991                                         if ((host->first_busy = tmp->next) == NULL)
992                                                 host->last_busy = NULL;
993                                 } else {
994                                         prev->next = tmp->next;
995                                         if (tmp == host->last_busy)
996                                                 host->last_busy = prev;
997                                 }
998                                 tmp->next = NULL;
999 
1000 
1001                                 tmp->hastat = HOST_ABORTED;
1002                                 tmp->flags |= SCF_DONE;
1003                                 if (tmp->flags & SCF_POST)
1004                                         (*tmp->post) ((u8 *) host, (u8 *) tmp);
1005                                 spin_unlock_irqrestore(&host->semaph_lock, flags);
1006                                 return SCSI_ABORT_SUCCESS;
1007                         }
1008                 }
1009                 prev = tmp;
1010                 tmp = tmp->next;
1011         }
1012         spin_unlock_irqrestore(&host->semaph_lock, flags);
1013         return SCSI_ABORT_NOT_RUNNING;
1014 }
1015 
1016 /***************************************************************************/
1017 static int initio_bad_seq(struct initio_host * host)
1018 {
1019         struct scsi_ctrl_blk *scb;
1020 
1021         printk("initio_bad_seg c=%d\n", host->index);
1022 
1023         if ((scb = host->active) != NULL) {
1024                 initio_unlink_busy_scb(host, scb);
1025                 scb->hastat = HOST_BAD_PHAS;
1026                 scb->tastat = 0;
1027                 initio_append_done_scb(host, scb);
1028         }
1029         initio_stop_bm(host);
1030         initio_reset_scsi(host, 8);     /* 7/29/98 */
1031         return initio_post_scsi_rst(host);
1032 }
1033 
1034 
1035 /************************************************************************/
1036 static void initio_exec_scb(struct initio_host * host, struct scsi_ctrl_blk * scb)
1037 {
1038         unsigned long flags;
1039 
1040         scb->mode = 0;
1041 
1042         scb->sgidx = 0;
1043         scb->sgmax = scb->sglen;
1044 
1045         spin_lock_irqsave(&host->semaph_lock, flags);
1046 
1047         initio_append_pend_scb(host, scb);      /* Append this SCB to Pending queue */
1048 
1049 /* VVVVV 07/21/98 */
1050         if (host->semaph == 1) {
1051                 /* Disable Jasmin SCSI Int */
1052                 outb(0x1F, host->addr + TUL_Mask);
1053                 host->semaph = 0;
1054                 spin_unlock_irqrestore(&host->semaph_lock, flags);
1055 
1056                 tulip_main(host);
1057 
1058                 spin_lock_irqsave(&host->semaph_lock, flags);
1059                 host->semaph = 1;
1060                 outb(0x0F, host->addr + TUL_Mask);
1061         }
1062         spin_unlock_irqrestore(&host->semaph_lock, flags);
1063         return;
1064 }
1065 
1066 /***************************************************************************/
1067 static int initio_isr(struct initio_host * host)
1068 {
1069         if (inb(host->addr + TUL_Int) & TSS_INT_PENDING) {
1070                 if (host->semaph == 1) {
1071                         outb(0x1F, host->addr + TUL_Mask);
1072                         /* Disable Tulip SCSI Int */
1073                         host->semaph = 0;
1074 
1075                         tulip_main(host);
1076 
1077                         host->semaph = 1;
1078                         outb(0x0F, host->addr + TUL_Mask);
1079                         return 1;
1080                 }
1081         }
1082         return 0;
1083 }
1084 
1085 static int tulip_main(struct initio_host * host)
1086 {
1087         struct scsi_ctrl_blk *scb;
1088 
1089         for (;;) {
1090                 tulip_scsi(host);       /* Call tulip_scsi              */
1091 
1092                 /* Walk the list of completed SCBs */
1093                 while ((scb = initio_find_done_scb(host)) != NULL) {    /* find done entry */
1094                         if (scb->tastat == INI_QUEUE_FULL) {
1095                                 host->max_tags[scb->target] =
1096                                     host->act_tags[scb->target] - 1;
1097                                 scb->tastat = 0;
1098                                 initio_append_pend_scb(host, scb);
1099                                 continue;
1100                         }
1101                         if (!(scb->mode & SCM_RSENS)) {         /* not in auto req. sense mode */
1102                                 if (scb->tastat == 2) {
1103 
1104                                         /* clr sync. nego flag */
1105 
1106                                         if (scb->flags & SCF_SENSE) {
1107                                                 u8 len;
1108                                                 len = scb->senselen;
1109                                                 if (len == 0)
1110                                                         len = 1;
1111                                                 scb->buflen = scb->senselen;
1112                                                 scb->bufptr = scb->senseptr;
1113                                                 scb->flags &= ~(SCF_SG | SCF_DIR);      /* for xfer_data_in */
1114                                                 /* so, we won't report wrong direction in xfer_data_in,
1115                                                    and won't report HOST_DO_DU in state_6 */
1116                                                 scb->mode = SCM_RSENS;
1117                                                 scb->ident &= 0xBF;     /* Disable Disconnect */
1118                                                 scb->tagmsg = 0;
1119                                                 scb->tastat = 0;
1120                                                 scb->cdblen = 6;
1121                                                 scb->cdb[0] = SCSICMD_RequestSense;
1122                                                 scb->cdb[1] = 0;
1123                                                 scb->cdb[2] = 0;
1124                                                 scb->cdb[3] = 0;
1125                                                 scb->cdb[4] = len;
1126                                                 scb->cdb[5] = 0;
1127                                                 initio_push_pend_scb(host, scb);
1128                                                 break;
1129                                         }
1130                                 }
1131                         } else {        /* in request sense mode */
1132 
1133                                 if (scb->tastat == 2) {         /* check contition status again after sending
1134                                                                            requset sense cmd 0x3 */
1135                                         scb->hastat = HOST_BAD_PHAS;
1136                                 }
1137                                 scb->tastat = 2;
1138                         }
1139                         scb->flags |= SCF_DONE;
1140                         if (scb->flags & SCF_POST) {
1141                                 /* FIXME: only one post method and lose casts */
1142                                 (*scb->post) ((u8 *) host, (u8 *) scb);
1143                         }
1144                 }               /* while */
1145                 /* find_active: */
1146                 if (inb(host->addr + TUL_SStatus0) & TSS_INT_PENDING)
1147                         continue;
1148                 if (host->active)       /* return to OS and wait for xfer_done_ISR/Selected_ISR */
1149                         return 1;       /* return to OS, enable interrupt */
1150                 /* Check pending SCB            */
1151                 if (initio_find_first_pend_scb(host) == NULL)
1152                         return 1;       /* return to OS, enable interrupt */
1153         }                       /* End of for loop */
1154         /* statement won't reach here */
1155 }
1156 
1157 static void tulip_scsi(struct initio_host * host)
1158 {
1159         struct scsi_ctrl_blk *scb;
1160         struct target_control *active_tc;
1161 
1162         /* make sure to service interrupt asap */
1163         if ((host->jsstatus0 = inb(host->addr + TUL_SStatus0)) & TSS_INT_PENDING) {
1164                 host->phase = host->jsstatus0 & TSS_PH_MASK;
1165                 host->jsstatus1 = inb(host->addr + TUL_SStatus1);
1166                 host->jsint = inb(host->addr + TUL_SInt);
1167                 if (host->jsint & TSS_SCSIRST_INT) {    /* SCSI bus reset detected      */
1168                         int_initio_scsi_rst(host);
1169                         return;
1170                 }
1171                 if (host->jsint & TSS_RESEL_INT) {      /* if selected/reselected interrupt */
1172                         if (int_initio_resel(host) == 0)
1173                                 initio_next_state(host);
1174                         return;
1175                 }
1176                 if (host->jsint & TSS_SEL_TIMEOUT) {
1177                         int_initio_busfree(host);
1178                         return;
1179                 }
1180                 if (host->jsint & TSS_DISC_INT) {       /* BUS disconnection            */
1181                         int_initio_busfree(host);       /* unexpected bus free or sel timeout */
1182                         return;
1183                 }
1184                 if (host->jsint & (TSS_FUNC_COMP | TSS_BUS_SERV)) {     /* func complete or Bus service */
1185                         if ((scb = host->active) != NULL)
1186                                 initio_next_state(host);
1187                         return;
1188                 }
1189         }
1190         if (host->active != NULL)
1191                 return;
1192 
1193         if ((scb = initio_find_first_pend_scb(host)) == NULL)
1194                 return;
1195 
1196         /* program HBA's SCSI ID & target SCSI ID */
1197         outb((host->scsi_id << 4) | (scb->target & 0x0F),
1198                 host->addr + TUL_SScsiId);
1199         if (scb->opcode == ExecSCSI) {
1200                 active_tc = &host->targets[scb->target];
1201 
1202                 if (scb->tagmsg)
1203                         active_tc->drv_flags |= TCF_DRV_EN_TAG;
1204                 else
1205                         active_tc->drv_flags &= ~TCF_DRV_EN_TAG;
1206 
1207                 outb(active_tc->js_period, host->addr + TUL_SPeriod);
1208                 if ((active_tc->flags & (TCF_WDTR_DONE | TCF_NO_WDTR)) == 0) {  /* do wdtr negotiation          */
1209                         initio_select_atn_stop(host, scb);
1210                 } else {
1211                         if ((active_tc->flags & (TCF_SYNC_DONE | TCF_NO_SYNC_NEGO)) == 0) {     /* do sync negotiation          */
1212                                 initio_select_atn_stop(host, scb);
1213                         } else {
1214                                 if (scb->tagmsg)
1215                                         initio_select_atn3(host, scb);
1216                                 else
1217                                         initio_select_atn(host, scb);
1218                         }
1219                 }
1220                 if (scb->flags & SCF_POLL) {
1221                         while (wait_tulip(host) != -1) {
1222                                 if (initio_next_state(host) == -1)
1223                                         break;
1224                         }
1225                 }
1226         } else if (scb->opcode == BusDevRst) {
1227                 initio_select_atn_stop(host, scb);
1228                 scb->next_state = 8;
1229                 if (scb->flags & SCF_POLL) {
1230                         while (wait_tulip(host) != -1) {
1231                                 if (initio_next_state(host) == -1)
1232                                         break;
1233                         }
1234                 }
1235         } else if (scb->opcode == AbortCmd) {
1236                 if (initio_abort_srb(host, scb->srb) != 0) {
1237                         initio_unlink_pend_scb(host, scb);
1238                         initio_release_scb(host, scb);
1239                 } else {
1240                         scb->opcode = BusDevRst;
1241                         initio_select_atn_stop(host, scb);
1242                         scb->next_state = 8;
1243                 }
1244         } else {
1245                 initio_unlink_pend_scb(host, scb);
1246                 scb->hastat = 0x16;     /* bad command */
1247                 initio_append_done_scb(host, scb);
1248         }
1249         return;
1250 }
1251 
1252 /**
1253  *      initio_next_state               -       Next SCSI state
1254  *      @host: InitIO host we are processing
1255  *
1256  *      Progress the active command block along the state machine
1257  *      until we hit a state which we must wait for activity to occur.
1258  *
1259  *      Returns zero or a negative code.
1260  */
1261 
1262 static int initio_next_state(struct initio_host * host)
1263 {
1264         int next;
1265 
1266         next = host->active->next_state;
1267         for (;;) {
1268                 switch (next) {
1269                 case 1:
1270                         next = initio_state_1(host);
1271                         break;
1272                 case 2:
1273                         next = initio_state_2(host);
1274                         break;
1275                 case 3:
1276                         next = initio_state_3(host);
1277                         break;
1278                 case 4:
1279                         next = initio_state_4(host);
1280                         break;
1281                 case 5:
1282                         next = initio_state_5(host);
1283                         break;
1284                 case 6:
1285                         next = initio_state_6(host);
1286                         break;
1287                 case 7:
1288                         next = initio_state_7(host);
1289                         break;
1290                 case 8:
1291                         return initio_bus_device_reset(host);
1292                 default:
1293                         return initio_bad_seq(host);
1294                 }
1295                 if (next <= 0)
1296                         return next;
1297         }
1298 }
1299 
1300 
1301 /**
1302  *      initio_state_1          -       SCSI state machine
1303  *      @host: InitIO host we are controlling
1304  *
1305  *      Perform SCSI state processing for Select/Attention/Stop
1306  */
1307 
1308 static int initio_state_1(struct initio_host * host)
1309 {
1310         struct scsi_ctrl_blk *scb = host->active;
1311         struct target_control *active_tc = host->active_tc;
1312 #if DEBUG_STATE
1313         printk("-s1-");
1314 #endif
1315 
1316         /* Move the SCB from pending to busy */
1317         initio_unlink_pend_scb(host, scb);
1318         initio_append_busy_scb(host, scb);
1319 
1320         outb(active_tc->sconfig0, host->addr + TUL_SConfig );
1321         /* ATN on */
1322         if (host->phase == MSG_OUT) {
1323                 outb(TSC_EN_BUS_IN | TSC_HW_RESELECT, host->addr + TUL_SCtrl1);
1324                 outb(scb->ident, host->addr + TUL_SFifo);
1325 
1326                 if (scb->tagmsg) {
1327                         outb(scb->tagmsg, host->addr + TUL_SFifo);
1328                         outb(scb->tagid, host->addr + TUL_SFifo);
1329                 }
1330                 if ((active_tc->flags & (TCF_WDTR_DONE | TCF_NO_WDTR)) == 0) {
1331                         active_tc->flags |= TCF_WDTR_DONE;
1332                         outb(MSG_EXTEND, host->addr + TUL_SFifo);
1333                         outb(2, host->addr + TUL_SFifo);        /* Extended msg length */
1334                         outb(3, host->addr + TUL_SFifo);        /* Sync request */
1335                         outb(1, host->addr + TUL_SFifo);        /* Start from 16 bits */
1336                 } else if ((active_tc->flags & (TCF_SYNC_DONE | TCF_NO_SYNC_NEGO)) == 0) {
1337                         active_tc->flags |= TCF_SYNC_DONE;
1338                         outb(MSG_EXTEND, host->addr + TUL_SFifo);
1339                         outb(3, host->addr + TUL_SFifo);        /* extended msg length */
1340                         outb(1, host->addr + TUL_SFifo);        /* sync request */
1341                         outb(initio_rate_tbl[active_tc->flags & TCF_SCSI_RATE], host->addr + TUL_SFifo);
1342                         outb(MAX_OFFSET, host->addr + TUL_SFifo);       /* REQ/ACK offset */
1343                 }
1344                 outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
1345                 if (wait_tulip(host) == -1)
1346                         return -1;
1347         }
1348         outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
1349         outb((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)), host->addr + TUL_SSignal);
1350         /* Into before CDB xfer */
1351         return 3;
1352 }
1353 
1354 
1355 /**
1356  *      initio_state_2          -       SCSI state machine
1357  *      @host: InitIO host we are controlling
1358  *
1359  * state after selection with attention
1360  * state after selection with attention3
1361  */
1362 
1363 static int initio_state_2(struct initio_host * host)
1364 {
1365         struct scsi_ctrl_blk *scb = host->active;
1366         struct target_control *active_tc = host->active_tc;
1367 #if DEBUG_STATE
1368         printk("-s2-");
1369 #endif
1370 
1371         initio_unlink_pend_scb(host, scb);
1372         initio_append_busy_scb(host, scb);
1373 
1374         outb(active_tc->sconfig0, host->addr + TUL_SConfig);
1375 
1376         if (host->jsstatus1 & TSS_CMD_PH_CMP)
1377                 return 4;
1378 
1379         outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
1380         outb((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)), host->addr + TUL_SSignal);
1381         /* Into before CDB xfer */
1382         return 3;
1383 }
1384 
1385 /**
1386  *      initio_state_3          -       SCSI state machine
1387  *      @host: InitIO host we are controlling
1388  *
1389  * state before CDB xfer is done
1390  */
1391 
1392 static int initio_state_3(struct initio_host * host)
1393 {
1394         struct scsi_ctrl_blk *scb = host->active;
1395         struct target_control *active_tc = host->active_tc;
1396         int i;
1397 
1398 #if DEBUG_STATE
1399         printk("-s3-");
1400 #endif
1401         for (;;) {
1402                 switch (host->phase) {
1403                 case CMD_OUT:   /* Command out phase            */
1404                         for (i = 0; i < (int) scb->cdblen; i++)
1405                                 outb(scb->cdb[i], host->addr + TUL_SFifo);
1406                         outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
1407                         if (wait_tulip(host) == -1)
1408                                 return -1;
1409                         if (host->phase == CMD_OUT)
1410                                 return initio_bad_seq(host);
1411                         return 4;
1412 
1413                 case MSG_IN:    /* Message in phase             */
1414                         scb->next_state = 3;
1415                         if (initio_msgin(host) == -1)
1416                                 return -1;
1417                         break;
1418 
1419                 case STATUS_IN: /* Status phase                 */
1420                         if (initio_status_msg(host) == -1)
1421                                 return -1;
1422                         break;
1423 
1424                 case MSG_OUT:   /* Message out phase            */
1425                         if (active_tc->flags & (TCF_SYNC_DONE | TCF_NO_SYNC_NEGO)) {
1426                                 outb(MSG_NOP, host->addr + TUL_SFifo);          /* msg nop */
1427                                 outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
1428                                 if (wait_tulip(host) == -1)
1429                                         return -1;
1430                         } else {
1431                                 active_tc->flags |= TCF_SYNC_DONE;
1432 
1433                                 outb(MSG_EXTEND, host->addr + TUL_SFifo);
1434                                 outb(3, host->addr + TUL_SFifo);        /* ext. msg len */
1435                                 outb(1, host->addr + TUL_SFifo);        /* sync request */
1436                                 outb(initio_rate_tbl[active_tc->flags & TCF_SCSI_RATE], host->addr + TUL_SFifo);
1437                                 outb(MAX_OFFSET, host->addr + TUL_SFifo);       /* REQ/ACK offset */
1438                                 outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
1439                                 if (wait_tulip(host) == -1)
1440                                         return -1;
1441                                 outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
1442                                 outb(inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7), host->addr + TUL_SSignal);
1443 
1444                         }
1445                         break;
1446                 default:
1447                         return initio_bad_seq(host);
1448                 }
1449         }
1450 }
1451 
1452 /**
1453  *      initio_state_4          -       SCSI state machine
1454  *      @host: InitIO host we are controlling
1455  *
1456  *      SCSI state machine. State 4
1457  */
1458 
1459 static int initio_state_4(struct initio_host * host)
1460 {
1461         struct scsi_ctrl_blk *scb = host->active;
1462 
1463 #if DEBUG_STATE
1464         printk("-s4-");
1465 #endif
1466         if ((scb->flags & SCF_DIR) == SCF_NO_XF) {
1467                 return 6;       /* Go to state 6 (After data) */
1468         }
1469         for (;;) {
1470                 if (scb->buflen == 0)
1471                         return 6;
1472 
1473                 switch (host->phase) {
1474 
1475                 case STATUS_IN: /* Status phase                 */
1476                         if ((scb->flags & SCF_DIR) != 0)        /* if direction bit set then report data underrun */
1477                                 scb->hastat = HOST_DO_DU;
1478                         if ((initio_status_msg(host)) == -1)
1479                                 return -1;
1480                         break;
1481 
1482                 case MSG_IN:    /* Message in phase             */
1483                         scb->next_state = 0x4;
1484                         if (initio_msgin(host) == -1)
1485                                 return -1;
1486                         break;
1487 
1488                 case MSG_OUT:   /* Message out phase            */
1489                         if (host->jsstatus0 & TSS_PAR_ERROR) {
1490                                 scb->buflen = 0;
1491                                 scb->hastat = HOST_DO_DU;
1492                                 if (initio_msgout_ide(host) == -1)
1493                                         return -1;
1494                                 return 6;
1495                         } else {
1496                                 outb(MSG_NOP, host->addr + TUL_SFifo);          /* msg nop */
1497                                 outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
1498                                 if (wait_tulip(host) == -1)
1499                                         return -1;
1500                         }
1501                         break;
1502 
1503                 case DATA_IN:   /* Data in phase                */
1504                         return initio_xfer_data_in(host);
1505 
1506                 case DATA_OUT:  /* Data out phase               */
1507                         return initio_xfer_data_out(host);
1508 
1509                 default:
1510                         return initio_bad_seq(host);
1511                 }
1512         }
1513 }
1514 
1515 
1516 /**
1517  *      initio_state_5          -       SCSI state machine
1518  *      @host: InitIO host we are controlling
1519  *
1520  *      State after dma xfer done or phase change before xfer done
1521  */
1522 
1523 static int initio_state_5(struct initio_host * host)
1524 {
1525         struct scsi_ctrl_blk *scb = host->active;
1526         long cnt, xcnt;         /* cannot use unsigned !! code: if (xcnt < 0) */
1527 
1528 #if DEBUG_STATE
1529         printk("-s5-");
1530 #endif
1531         /*------ get remaining count -------*/
1532         cnt = inl(host->addr + TUL_SCnt0) & 0x0FFFFFF;
1533 
1534         if (inb(host->addr + TUL_XCmd) & 0x20) {
1535                 /* ----------------------- DATA_IN ----------------------------- */
1536                 /* check scsi parity error */
1537                 if (host->jsstatus0 & TSS_PAR_ERROR)
1538                         scb->hastat = HOST_DO_DU;
1539                 if (inb(host->addr + TUL_XStatus) & XPEND) {    /* DMA xfer pending, Send STOP  */
1540                         /* tell Hardware  scsi xfer has been terminated */
1541                         outb(inb(host->addr + TUL_XCtrl) | 0x80, host->addr + TUL_XCtrl);
1542                         /* wait until DMA xfer not pending */
1543                         while (inb(host->addr + TUL_XStatus) & XPEND)
1544                                 cpu_relax();
1545                 }
1546         } else {
1547                 /*-------- DATA OUT -----------*/
1548                 if ((inb(host->addr + TUL_SStatus1) & TSS_XFER_CMP) == 0) {
1549                         if (host->active_tc->js_period & TSC_WIDE_SCSI)
1550                                 cnt += (inb(host->addr + TUL_SFifoCnt) & 0x1F) << 1;
1551                         else
1552                                 cnt += (inb(host->addr + TUL_SFifoCnt) & 0x1F);
1553                 }
1554                 if (inb(host->addr + TUL_XStatus) & XPEND) {    /* if DMA xfer is pending, abort DMA xfer */
1555                         outb(TAX_X_ABT, host->addr + TUL_XCmd);
1556                         /* wait Abort DMA xfer done */
1557                         while ((inb(host->addr + TUL_Int) & XABT) == 0)
1558                                 cpu_relax();
1559                 }
1560                 if ((cnt == 1) && (host->phase == DATA_OUT)) {
1561                         outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
1562                         if (wait_tulip(host) == -1)
1563                                 return -1;
1564                         cnt = 0;
1565                 } else {
1566                         if ((inb(host->addr + TUL_SStatus1) & TSS_XFER_CMP) == 0)
1567                                 outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
1568                 }
1569         }
1570         if (cnt == 0) {
1571                 scb->buflen = 0;
1572                 return 6;       /* After Data */
1573         }
1574         /* Update active data pointer */
1575         xcnt = (long) scb->buflen - cnt;        /* xcnt== bytes already xferred */
1576         scb->buflen = (u32) cnt;                /* cnt == bytes left to be xferred */
1577         if (scb->flags & SCF_SG) {
1578                 struct sg_entry *sgp;
1579                 unsigned long i;
1580 
1581                 sgp = &scb->sglist[scb->sgidx];
1582                 for (i = scb->sgidx; i < scb->sgmax; sgp++, i++) {
1583                         xcnt -= (long) sgp->len;
1584                         if (xcnt < 0) {         /* this sgp xfer half done */
1585                                 xcnt += (long) sgp->len;        /* xcnt == bytes xferred in this sgp */
1586                                 sgp->data += (u32) xcnt;        /* new ptr to be xfer */
1587                                 sgp->len -= (u32) xcnt; /* new len to be xfer */
1588                                 scb->bufptr += ((u32) (i - scb->sgidx) << 3);
1589                                 /* new SG table ptr */
1590                                 scb->sglen = (u8) (scb->sgmax - i);
1591                                 /* new SG table len */
1592                                 scb->sgidx = (u16) i;
1593                                 /* for next disc and come in this loop */
1594                                 return 4;       /* Go to state 4                */
1595                         }
1596                         /* else (xcnt >= 0 , i.e. this sgp already xferred */
1597                 }               /* for */
1598                 return 6;       /* Go to state 6                */
1599         } else {
1600                 scb->bufptr += (u32) xcnt;
1601         }
1602         return 4;               /* Go to state 4                */
1603 }
1604 
1605 /**
1606  *      initio_state_6          -       SCSI state machine
1607  *      @host: InitIO host we are controlling
1608  *
1609  *      State after Data phase
1610  */
1611 
1612 static int initio_state_6(struct initio_host * host)
1613 {
1614         struct scsi_ctrl_blk *scb = host->active;
1615 
1616 #if DEBUG_STATE
1617         printk("-s6-");
1618 #endif
1619         for (;;) {
1620                 switch (host->phase) {
1621                 case STATUS_IN: /* Status phase                 */
1622                         if ((initio_status_msg(host)) == -1)
1623                                 return -1;
1624                         break;
1625 
1626                 case MSG_IN:    /* Message in phase             */
1627                         scb->next_state = 6;
1628                         if ((initio_msgin(host)) == -1)
1629                                 return -1;
1630                         break;
1631 
1632                 case MSG_OUT:   /* Message out phase            */
1633                         outb(MSG_NOP, host->addr + TUL_SFifo);          /* msg nop */
1634                         outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
1635                         if (wait_tulip(host) == -1)
1636                                 return -1;
1637                         break;
1638 
1639                 case DATA_IN:   /* Data in phase                */
1640                         return initio_xpad_in(host);
1641 
1642                 case DATA_OUT:  /* Data out phase               */
1643                         return initio_xpad_out(host);
1644 
1645                 default:
1646                         return initio_bad_seq(host);
1647                 }
1648         }
1649 }
1650 
1651 /**
1652  *      initio_state_7          -       SCSI state machine
1653  *      @host: InitIO host we are controlling
1654  *
1655  */
1656 
1657 int initio_state_7(struct initio_host * host)
1658 {
1659         int cnt, i;
1660 
1661 #if DEBUG_STATE
1662         printk("-s7-");
1663 #endif
1664         /* flush SCSI FIFO */
1665         cnt = inb(host->addr + TUL_SFifoCnt) & 0x1F;
1666         if (cnt) {
1667                 for (i = 0; i < cnt; i++)
1668                         inb(host->addr + TUL_SFifo);
1669         }
1670         switch (host->phase) {
1671         case DATA_IN:           /* Data in phase                */
1672         case DATA_OUT:          /* Data out phase               */
1673                 return initio_bad_seq(host);
1674         default:
1675                 return 6;       /* Go to state 6                */
1676         }
1677 }
1678 
1679 /**
1680  *      initio_xfer_data_in     -       Commence data input
1681  *      @host: InitIO host in use
1682  *
1683  *      Commence a block of data transfer. The transfer itself will
1684  *      be managed by the controller and we will get a completion (or
1685  *      failure) interrupt.
1686  */
1687 static int initio_xfer_data_in(struct initio_host * host)
1688 {
1689         struct scsi_ctrl_blk *scb = host->active;
1690 
1691         if ((scb->flags & SCF_DIR) == SCF_DOUT)
1692                 return 6;       /* wrong direction */
1693 
1694         outl(scb->buflen, host->addr + TUL_SCnt0);
1695         outb(TSC_XF_DMA_IN, host->addr + TUL_SCmd);     /* 7/25/95 */
1696 
1697         if (scb->flags & SCF_SG) {      /* S/G xfer */
1698                 outl(((u32) scb->sglen) << 3, host->addr + TUL_XCntH);
1699                 outl(scb->bufptr, host->addr + TUL_XAddH);
1700                 outb(TAX_SG_IN, host->addr + TUL_XCmd);
1701         } else {
1702                 outl(scb->buflen, host->addr + TUL_XCntH);
1703                 outl(scb->bufptr, host->addr + TUL_XAddH);
1704                 outb(TAX_X_IN, host->addr + TUL_XCmd);
1705         }
1706         scb->next_state = 0x5;
1707         return 0;               /* return to OS, wait xfer done , let jas_isr come in */
1708 }
1709 
1710 /**
1711  *      initio_xfer_data_out    -       Commence data output
1712  *      @host: InitIO host in use
1713  *
1714  *      Commence a block of data transfer. The transfer itself will
1715  *      be managed by the controller and we will get a completion (or
1716  *      failure) interrupt.
1717  */
1718 
1719 static int initio_xfer_data_out(struct initio_host * host)
1720 {
1721         struct scsi_ctrl_blk *scb = host->active;
1722 
1723         if ((scb->flags & SCF_DIR) == SCF_DIN)
1724                 return 6;       /* wrong direction */
1725 
1726         outl(scb->buflen, host->addr + TUL_SCnt0);
1727         outb(TSC_XF_DMA_OUT, host->addr + TUL_SCmd);
1728 
1729         if (scb->flags & SCF_SG) {      /* S/G xfer */
1730                 outl(((u32) scb->sglen) << 3, host->addr + TUL_XCntH);
1731                 outl(scb->bufptr, host->addr + TUL_XAddH);
1732                 outb(TAX_SG_OUT, host->addr + TUL_XCmd);
1733         } else {
1734                 outl(scb->buflen, host->addr + TUL_XCntH);
1735                 outl(scb->bufptr, host->addr + TUL_XAddH);
1736                 outb(TAX_X_OUT, host->addr + TUL_XCmd);
1737         }
1738 
1739         scb->next_state = 0x5;
1740         return 0;               /* return to OS, wait xfer done , let jas_isr come in */
1741 }
1742 
1743 int initio_xpad_in(struct initio_host * host)
1744 {
1745         struct scsi_ctrl_blk *scb = host->active;
1746         struct target_control *active_tc = host->active_tc;
1747 
1748         if ((scb->flags & SCF_DIR) != SCF_NO_DCHK)
1749                 scb->hastat = HOST_DO_DU;       /* over run             */
1750         for (;;) {
1751                 if (active_tc->js_period & TSC_WIDE_SCSI)
1752                         outl(2, host->addr + TUL_SCnt0);
1753                 else
1754                         outl(1, host->addr + TUL_SCnt0);
1755 
1756                 outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
1757                 if (wait_tulip(host) == -1)
1758                         return -1;
1759                 if (host->phase != DATA_IN) {
1760                         outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
1761                         return 6;
1762                 }
1763                 inb(host->addr + TUL_SFifo);
1764         }
1765 }
1766 
1767 int initio_xpad_out(struct initio_host * host)
1768 {
1769         struct scsi_ctrl_blk *scb = host->active;
1770         struct target_control *active_tc = host->active_tc;
1771 
1772         if ((scb->flags & SCF_DIR) != SCF_NO_DCHK)
1773                 scb->hastat = HOST_DO_DU;       /* over run             */
1774         for (;;) {
1775                 if (active_tc->js_period & TSC_WIDE_SCSI)
1776                         outl(2, host->addr + TUL_SCnt0);
1777                 else
1778                         outl(1, host->addr + TUL_SCnt0);
1779 
1780                 outb(0, host->addr + TUL_SFifo);
1781                 outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
1782                 if ((wait_tulip(host)) == -1)
1783                         return -1;
1784                 if (host->phase != DATA_OUT) {  /* Disable wide CPU to allow read 16 bits */
1785                         outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1);
1786                         outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
1787                         return 6;
1788                 }
1789         }
1790 }
1791 
1792 int initio_status_msg(struct initio_host * host)
1793 {                               /* status & MSG_IN */
1794         struct scsi_ctrl_blk *scb = host->active;
1795         u8 msg;
1796 
1797         outb(TSC_CMD_COMP, host->addr + TUL_SCmd);
1798         if (wait_tulip(host) == -1)
1799                 return -1;
1800 
1801         /* get status */
1802         scb->tastat = inb(host->addr + TUL_SFifo);
1803 
1804         if (host->phase == MSG_OUT) {
1805                 if (host->jsstatus0 & TSS_PAR_ERROR)
1806                         outb(MSG_PARITY, host->addr + TUL_SFifo);
1807                 else
1808                         outb(MSG_NOP, host->addr + TUL_SFifo);
1809                 outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
1810                 return wait_tulip(host);
1811         }
1812         if (host->phase == MSG_IN) {
1813                 msg = inb(host->addr + TUL_SFifo);
1814                 if (host->jsstatus0 & TSS_PAR_ERROR) {  /* Parity error                 */
1815                         if ((initio_msgin_accept(host)) == -1)
1816                                 return -1;
1817                         if (host->phase != MSG_OUT)
1818                                 return initio_bad_seq(host);
1819                         outb(MSG_PARITY, host->addr + TUL_SFifo);
1820                         outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
1821                         return wait_tulip(host);
1822                 }
1823                 if (msg == 0) { /* Command complete             */
1824 
1825                         if ((scb->tastat & 0x18) == 0x10)       /* No link support              */
1826                                 return initio_bad_seq(host);
1827                         outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
1828                         outb(TSC_MSG_ACCEPT, host->addr + TUL_SCmd);
1829                         return initio_wait_done_disc(host);
1830 
1831                 }
1832                 if (msg == MSG_LINK_COMP || msg == MSG_LINK_FLAG) {
1833                         if ((scb->tastat & 0x18) == 0x10)
1834                                 return initio_msgin_accept(host);
1835                 }
1836         }
1837         return initio_bad_seq(host);
1838 }
1839 
1840 
1841 /* scsi bus free */
1842 int int_initio_busfree(struct initio_host * host)
1843 {
1844         struct scsi_ctrl_blk *scb = host->active;
1845 
1846         if (scb != NULL) {
1847                 if (scb->status & SCB_SELECT) {         /* selection timeout */
1848                         initio_unlink_pend_scb(host, scb);
1849                         scb->hastat = HOST_SEL_TOUT;
1850                         initio_append_done_scb(host, scb);
1851                 } else {        /* Unexpected bus free          */
1852                         initio_unlink_busy_scb(host, scb);
1853                         scb->hastat = HOST_BUS_FREE;
1854                         initio_append_done_scb(host, scb);
1855                 }
1856                 host->active = NULL;
1857                 host->active_tc = NULL;
1858         }
1859         outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);          /* Flush SCSI FIFO  */
1860         outb(TSC_INITDEFAULT, host->addr + TUL_SConfig);
1861         outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1); /* Enable HW reselect       */
1862         return -1;
1863 }
1864 
1865 
1866 /**
1867  *      int_initio_scsi_rst     -       SCSI reset occurred
1868  *      @host: Host seeing the reset
1869  *
1870  *      A SCSI bus reset has occurred. Clean up any pending transfer
1871  *      the hardware is doing by DMA and then abort all active and
1872  *      disconnected commands. The mid layer should sort the rest out
1873  *      for us
1874  */
1875 
1876 static int int_initio_scsi_rst(struct initio_host * host)
1877 {
1878         struct scsi_ctrl_blk *scb;
1879         int i;
1880 
1881         /* if DMA xfer is pending, abort DMA xfer */
1882         if (inb(host->addr + TUL_XStatus) & 0x01) {
1883                 outb(TAX_X_ABT | TAX_X_CLR_FIFO, host->addr + TUL_XCmd);
1884                 /* wait Abort DMA xfer done */
1885                 while ((inb(host->addr + TUL_Int) & 0x04) == 0)
1886                         cpu_relax();
1887                 outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
1888         }
1889         /* Abort all active & disconnected scb */
1890         while ((scb = initio_pop_busy_scb(host)) != NULL) {
1891                 scb->hastat = HOST_BAD_PHAS;
1892                 initio_append_done_scb(host, scb);
1893         }
1894         host->active = NULL;
1895         host->active_tc = NULL;
1896 
1897         /* clr sync nego. done flag */
1898         for (i = 0; i < host->max_tar; i++)
1899                 host->targets[i].flags &= ~(TCF_SYNC_DONE | TCF_WDTR_DONE);
1900         return -1;
1901 }
1902 
1903 /**
1904  *      int_initio_scsi_resel   -       Reselection occurred
1905  *      @host: InitIO host adapter
1906  *
1907  *      A SCSI reselection event has been signalled and the interrupt
1908  *      is now being processed. Work out which command block needs attention
1909  *      and continue processing that command.
1910  */
1911 
1912 int int_initio_resel(struct initio_host * host)
1913 {
1914         struct scsi_ctrl_blk *scb;
1915         struct target_control *active_tc;
1916         u8 tag, msg = 0;
1917         u8 tar, lun;
1918 
1919         if ((scb = host->active) != NULL) {
1920                 /* FIXME: Why check and not just clear ? */
1921                 if (scb->status & SCB_SELECT)           /* if waiting for selection complete */
1922                         scb->status &= ~SCB_SELECT;
1923                 host->active = NULL;
1924         }
1925         /* --------- get target id---------------------- */
1926         tar = inb(host->addr + TUL_SBusId);
1927         /* ------ get LUN from Identify message----------- */
1928         lun = inb(host->addr + TUL_SIdent) & 0x0F;
1929         /* 07/22/98 from 0x1F -> 0x0F */
1930         active_tc = &host->targets[tar];
1931         host->active_tc = active_tc;
1932         outb(active_tc->sconfig0, host->addr + TUL_SConfig);
1933         outb(active_tc->js_period, host->addr + TUL_SPeriod);
1934 
1935         /* ------------- tag queueing ? ------------------- */
1936         if (active_tc->drv_flags & TCF_DRV_EN_TAG) {
1937                 if ((initio_msgin_accept(host)) == -1)
1938                         return -1;
1939                 if (host->phase != MSG_IN)
1940                         goto no_tag;
1941                 outl(1, host->addr + TUL_SCnt0);
1942                 outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
1943                 if (wait_tulip(host) == -1)
1944                         return -1;
1945                 msg = inb(host->addr + TUL_SFifo);      /* Read Tag Message    */
1946 
1947                 if (msg < MSG_STAG || msg > MSG_OTAG)           /* Is simple Tag      */
1948                         goto no_tag;
1949 
1950                 if (initio_msgin_accept(host) == -1)
1951                         return -1;
1952 
1953                 if (host->phase != MSG_IN)
1954                         goto no_tag;
1955 
1956                 outl(1, host->addr + TUL_SCnt0);
1957                 outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
1958                 if (wait_tulip(host) == -1)
1959                         return -1;
1960                 tag = inb(host->addr + TUL_SFifo);      /* Read Tag ID       */
1961                 scb = host->scb + tag;
1962                 if (scb->target != tar || scb->lun != lun) {
1963                         return initio_msgout_abort_tag(host);
1964                 }
1965                 if (scb->status != SCB_BUSY) {  /* 03/24/95             */
1966                         return initio_msgout_abort_tag(host);
1967                 }
1968                 host->active = scb;
1969                 if ((initio_msgin_accept(host)) == -1)
1970                         return -1;
1971         } else {                /* No tag               */
1972               no_tag:
1973                 if ((scb = initio_find_busy_scb(host, tar | (lun << 8))) == NULL) {
1974                         return initio_msgout_abort_targ(host);
1975                 }
1976                 host->active = scb;
1977                 if (!(active_tc->drv_flags & TCF_DRV_EN_TAG)) {
1978                         if ((initio_msgin_accept(host)) == -1)
1979                                 return -1;
1980                 }
1981         }
1982         return 0;
1983 }
1984 
1985 /**
1986  *      int_initio_bad_seq              -       out of phase
1987  *      @host: InitIO host flagging event
1988  *
1989  *      We have ended up out of phase somehow. Reset the host controller
1990  *      and throw all our toys out of the pram. Let the midlayer clean up
1991  */
1992 
1993 static int int_initio_bad_seq(struct initio_host * host)
1994 {                               /* target wrong phase           */
1995         struct scsi_ctrl_blk *scb;
1996         int i;
1997 
1998         initio_reset_scsi(host, 10);
1999 
2000         while ((scb = initio_pop_busy_scb(host)) != NULL) {
2001                 scb->hastat = HOST_BAD_PHAS;
2002                 initio_append_done_scb(host, scb);
2003         }
2004         for (i = 0; i < host->max_tar; i++)
2005                 host->targets[i].flags &= ~(TCF_SYNC_DONE | TCF_WDTR_DONE);
2006         return -1;
2007 }
2008 
2009 
2010 /**
2011  *      initio_msgout_abort_targ                -       abort a tag
2012  *      @host: InitIO host
2013  *
2014  *      Abort when the target/lun does not match or when our SCB is not
2015  *      busy. Used by untagged commands.
2016  */
2017 
2018 static int initio_msgout_abort_targ(struct initio_host * host)
2019 {
2020 
2021         outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN), host->addr + TUL_SSignal);
2022         if (initio_msgin_accept(host) == -1)
2023                 return -1;
2024         if (host->phase != MSG_OUT)
2025                 return initio_bad_seq(host);
2026 
2027         outb(MSG_ABORT, host->addr + TUL_SFifo);
2028         outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
2029 
2030         return initio_wait_disc(host);
2031 }
2032 
2033 /**
2034  *      initio_msgout_abort_tag         -       abort a tag
2035  *      @host: InitIO host
2036  *
2037  *      Abort when the target/lun does not match or when our SCB is not
2038  *      busy. Used for tagged commands.
2039  */
2040 
2041 static int initio_msgout_abort_tag(struct initio_host * host)
2042 {
2043 
2044         outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN), host->addr + TUL_SSignal);
2045         if (initio_msgin_accept(host) == -1)
2046                 return -1;
2047         if (host->phase != MSG_OUT)
2048                 return initio_bad_seq(host);
2049 
2050         outb(MSG_ABORT_TAG, host->addr + TUL_SFifo);
2051         outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
2052 
2053         return initio_wait_disc(host);
2054 
2055 }
2056 
2057 /**
2058  *      initio_msgin            -       Message in
2059  *      @host: InitIO Host
2060  *
2061  *      Process incoming message
2062  */
2063 static int initio_msgin(struct initio_host * host)
2064 {
2065         struct target_control *active_tc;
2066 
2067         for (;;) {
2068                 outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
2069 
2070                 outl(1, host->addr + TUL_SCnt0);
2071                 outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
2072                 if (wait_tulip(host) == -1)
2073                         return -1;
2074 
2075                 switch (inb(host->addr + TUL_SFifo)) {
2076                 case MSG_DISC:  /* Disconnect msg */
2077                         outb(TSC_MSG_ACCEPT, host->addr + TUL_SCmd);
2078                         return initio_wait_disc(host);
2079                 case MSG_SDP:
2080                 case MSG_RESTORE:
2081                 case MSG_NOP:
2082                         initio_msgin_accept(host);
2083                         break;
2084                 case MSG_REJ:   /* Clear ATN first              */
2085                         outb((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)),
2086                                 host->addr + TUL_SSignal);
2087                         active_tc = host->active_tc;
2088                         if ((active_tc->flags & (TCF_SYNC_DONE | TCF_NO_SYNC_NEGO)) == 0)       /* do sync nego */
2089                                 outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN),
2090                                         host->addr + TUL_SSignal);
2091                         initio_msgin_accept(host);
2092                         break;
2093                 case MSG_EXTEND:        /* extended msg */
2094                         initio_msgin_extend(host);
2095                         break;
2096                 case MSG_IGNOREWIDE:
2097                         initio_msgin_accept(host);
2098                         break;
2099                 case MSG_COMP:
2100                         outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
2101                         outb(TSC_MSG_ACCEPT, host->addr + TUL_SCmd);
2102                         return initio_wait_done_disc(host);
2103                 default:
2104                         initio_msgout_reject(host);
2105                         break;
2106                 }
2107                 if (host->phase != MSG_IN)
2108                         return host->phase;
2109         }
2110         /* statement won't reach here */
2111 }
2112 
2113 static int initio_msgout_reject(struct initio_host * host)
2114 {
2115         outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN), host->addr + TUL_SSignal);
2116 
2117         if (initio_msgin_accept(host) == -1)
2118                 return -1;
2119 
2120         if (host->phase == MSG_OUT) {
2121                 outb(MSG_REJ, host->addr + TUL_SFifo);          /* Msg reject           */
2122                 outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
2123                 return wait_tulip(host);
2124         }
2125         return host->phase;
2126 }
2127 
2128 static int initio_msgout_ide(struct initio_host * host)
2129 {
2130         outb(MSG_IDE, host->addr + TUL_SFifo);          /* Initiator Detected Error */
2131         outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
2132         return wait_tulip(host);
2133 }
2134 
2135 static int initio_msgin_extend(struct initio_host * host)
2136 {
2137         u8 len, idx;
2138 
2139         if (initio_msgin_accept(host) != MSG_IN)
2140                 return host->phase;
2141 
2142         /* Get extended msg length      */
2143         outl(1, host->addr + TUL_SCnt0);
2144         outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
2145         if (wait_tulip(host) == -1)
2146                 return -1;
2147 
2148         len = inb(host->addr + TUL_SFifo);
2149         host->msg[0] = len;
2150         for (idx = 1; len != 0; len--) {
2151 
2152                 if ((initio_msgin_accept(host)) != MSG_IN)
2153                         return host->phase;
2154                 outl(1, host->addr + TUL_SCnt0);
2155                 outb(TSC_XF_FIFO_IN, host->addr + TUL_SCmd);
2156                 if (wait_tulip(host) == -1)
2157                         return -1;
2158                 host->msg[idx++] = inb(host->addr + TUL_SFifo);
2159         }
2160         if (host->msg[1] == 1) {                /* if it's synchronous data transfer request */
2161                 u8 r;
2162                 if (host->msg[0] != 3)  /* if length is not right */
2163                         return initio_msgout_reject(host);
2164                 if (host->active_tc->flags & TCF_NO_SYNC_NEGO) {        /* Set OFFSET=0 to do async, nego back */
2165                         host->msg[3] = 0;
2166                 } else {
2167                         if (initio_msgin_sync(host) == 0 &&
2168                             (host->active_tc->flags & TCF_SYNC_DONE)) {
2169                                 initio_sync_done(host);
2170                                 return initio_msgin_accept(host);
2171                         }
2172                 }
2173 
2174                 r = inb(host->addr + TUL_SSignal);
2175                 outb((r & (TSC_SET_ACK | 7)) | TSC_SET_ATN,
2176                         host->addr + TUL_SSignal);
2177                 if (initio_msgin_accept(host) != MSG_OUT)
2178                         return host->phase;
2179                 /* sync msg out */
2180                 outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
2181 
2182                 initio_sync_done(host);
2183 
2184                 outb(MSG_EXTEND, host->addr + TUL_SFifo);
2185                 outb(3, host->addr + TUL_SFifo);
2186                 outb(1, host->addr + TUL_SFifo);
2187                 outb(host->msg[2], host->addr + TUL_SFifo);
2188                 outb(host->msg[3], host->addr + TUL_SFifo);
2189                 outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
2190                 return wait_tulip(host);
2191         }
2192         if (host->msg[0] != 2 || host->msg[1] != 3)
2193                 return initio_msgout_reject(host);
2194         /* if it's WIDE DATA XFER REQ   */
2195         if (host->active_tc->flags & TCF_NO_WDTR) {
2196                 host->msg[2] = 0;
2197         } else {
2198                 if (host->msg[2] > 2)   /* > 32 bits            */
2199                         return initio_msgout_reject(host);
2200                 if (host->msg[2] == 2) {                /* == 32                */
2201                         host->msg[2] = 1;
2202                 } else {
2203                         if ((host->active_tc->flags & TCF_NO_WDTR) == 0) {
2204                                 wdtr_done(host);
2205                                 if ((host->active_tc->flags & (TCF_SYNC_DONE | TCF_NO_SYNC_NEGO)) == 0)
2206                                         outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN), host->addr + TUL_SSignal);
2207                                 return initio_msgin_accept(host);
2208                         }
2209                 }
2210         }
2211         outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN), host->addr + TUL_SSignal);
2212 
2213         if (initio_msgin_accept(host) != MSG_OUT)
2214                 return host->phase;
2215         /* WDTR msg out                 */
2216         outb(MSG_EXTEND, host->addr + TUL_SFifo);
2217         outb(2, host->addr + TUL_SFifo);
2218         outb(3, host->addr + TUL_SFifo);
2219         outb(host->msg[2], host->addr + TUL_SFifo);
2220         outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
2221         return wait_tulip(host);
2222 }
2223 
2224 static int initio_msgin_sync(struct initio_host * host)
2225 {
2226         char default_period;
2227 
2228         default_period = initio_rate_tbl[host->active_tc->flags & TCF_SCSI_RATE];
2229         if (host->msg[3] > MAX_OFFSET) {
2230                 host->msg[3] = MAX_OFFSET;
2231                 if (host->msg[2] < default_period) {
2232                         host->msg[2] = default_period;
2233                         return 1;
2234                 }
2235                 if (host->msg[2] >= 59) /* Change to async              */
2236                         host->msg[3] = 0;
2237                 return 1;
2238         }
2239         /* offset requests asynchronous transfers ? */
2240         if (host->msg[3] == 0) {
2241                 return 0;
2242         }
2243         if (host->msg[2] < default_period) {
2244                 host->msg[2] = default_period;
2245                 return 1;
2246         }
2247         if (host->msg[2] >= 59) {
2248                 host->msg[3] = 0;
2249                 return 1;
2250         }
2251         return 0;
2252 }
2253 
2254 static int wdtr_done(struct initio_host * host)
2255 {
2256         host->active_tc->flags &= ~TCF_SYNC_DONE;
2257         host->active_tc->flags |= TCF_WDTR_DONE;
2258 
2259         host->active_tc->js_period = 0;
2260         if (host->msg[2])       /* if 16 bit */
2261                 host->active_tc->js_period |= TSC_WIDE_SCSI;
2262         host->active_tc->sconfig0 &= ~TSC_ALT_PERIOD;
2263         outb(host->active_tc->sconfig0, host->addr + TUL_SConfig);
2264         outb(host->active_tc->js_period, host->addr + TUL_SPeriod);
2265 
2266         return 1;
2267 }
2268 
2269 static int initio_sync_done(struct initio_host * host)
2270 {
2271         int i;
2272 
2273         host->active_tc->flags |= TCF_SYNC_DONE;
2274 
2275         if (host->msg[3]) {
2276                 host->active_tc->js_period |= host->msg[3];
2277                 for (i = 0; i < 8; i++) {
2278                         if (initio_rate_tbl[i] >= host->msg[2]) /* pick the big one */
2279                                 break;
2280                 }
2281                 host->active_tc->js_period |= (i << 4);
2282                 host->active_tc->sconfig0 |= TSC_ALT_PERIOD;
2283         }
2284         outb(host->active_tc->sconfig0, host->addr + TUL_SConfig);
2285         outb(host->active_tc->js_period, host->addr + TUL_SPeriod);
2286 
2287         return -1;
2288 }
2289 
2290 
2291 static int initio_post_scsi_rst(struct initio_host * host)
2292 {
2293         struct scsi_ctrl_blk *scb;
2294         struct target_control *active_tc;
2295         int i;
2296 
2297         host->active = NULL;
2298         host->active_tc = NULL;
2299         host->flags = 0;
2300 
2301         while ((scb = initio_pop_busy_scb(host)) != NULL) {
2302                 scb->hastat = HOST_BAD_PHAS;
2303                 initio_append_done_scb(host, scb);
2304         }
2305         /* clear sync done flag         */
2306         active_tc = &host->targets[0];
2307         for (i = 0; i < host->max_tar; active_tc++, i++) {
2308                 active_tc->flags &= ~(TCF_SYNC_DONE | TCF_WDTR_DONE);
2309                 /* Initialize the sync. xfer register values to an asyn xfer */
2310                 active_tc->js_period = 0;
2311                 active_tc->sconfig0 = host->sconf1;
2312                 host->act_tags[0] = 0;  /* 07/22/98 */
2313                 host->targets[i].flags &= ~TCF_BUSY;    /* 07/22/98 */
2314         }                       /* for */
2315 
2316         return -1;
2317 }
2318 
2319 static void initio_select_atn_stop(struct initio_host * host, struct scsi_ctrl_blk * scb)
2320 {
2321         scb->status |= SCB_SELECT;
2322         scb->next_state = 0x1;
2323         host->active = scb;
2324         host->active_tc = &host->targets[scb->target];
2325         outb(TSC_SELATNSTOP, host->addr + TUL_SCmd);
2326 }
2327 
2328 
2329 static void initio_select_atn(struct initio_host * host, struct scsi_ctrl_blk * scb)
2330 {
2331         int i;
2332 
2333         scb->status |= SCB_SELECT;
2334         scb->next_state = 0x2;
2335 
2336         outb(scb->ident, host->addr + TUL_SFifo);
2337         for (i = 0; i < (int) scb->cdblen; i++)
2338                 outb(scb->cdb[i], host->addr + TUL_SFifo);
2339         host->active_tc = &host->targets[scb->target];
2340         host->active = scb;
2341         outb(TSC_SEL_ATN, host->addr + TUL_SCmd);
2342 }
2343 
2344 static void initio_select_atn3(struct initio_host * host, struct scsi_ctrl_blk * scb)
2345 {
2346         int i;
2347 
2348         scb->status |= SCB_SELECT;
2349         scb->next_state = 0x2;
2350 
2351         outb(scb->ident, host->addr + TUL_SFifo);
2352         outb(scb->tagmsg, host->addr + TUL_SFifo);
2353         outb(scb->tagid, host->addr + TUL_SFifo);
2354         for (i = 0; i < scb->cdblen; i++)
2355                 outb(scb->cdb[i], host->addr + TUL_SFifo);
2356         host->active_tc = &host->targets[scb->target];
2357         host->active = scb;
2358         outb(TSC_SEL_ATN3, host->addr + TUL_SCmd);
2359 }
2360 
2361 /**
2362  *      initio_bus_device_reset -        SCSI Bus Device Reset
2363  *      @host: InitIO host to reset
2364  *
2365  *      Perform a device reset and abort all pending SCBs for the
2366  *      victim device
2367  */
2368 int initio_bus_device_reset(struct initio_host * host)
2369 {
2370         struct scsi_ctrl_blk *scb = host->active;
2371         struct target_control *active_tc = host->active_tc;
2372         struct scsi_ctrl_blk *tmp, *prev;
2373         u8 tar;
2374 
2375         if (host->phase != MSG_OUT)
2376                 return int_initio_bad_seq(host);        /* Unexpected phase */
2377 
2378         initio_unlink_pend_scb(host, scb);
2379         initio_release_scb(host, scb);
2380 
2381 
2382         tar = scb->target;      /* target                       */
2383         active_tc->flags &= ~(TCF_SYNC_DONE | TCF_WDTR_DONE | TCF_BUSY);
2384         /* clr sync. nego & WDTR flags  07/22/98 */
2385 
2386         /* abort all SCB with same target */
2387         prev = tmp = host->first_busy;  /* Check Busy queue */
2388         while (tmp != NULL) {
2389                 if (tmp->target == tar) {
2390                         /* unlink it */
2391                         if (tmp == host->first_busy) {
2392                                 if ((host->first_busy = tmp->next) == NULL)
2393                                         host->last_busy = NULL;
2394                         } else {
2395                                 prev->next = tmp->next;
2396                                 if (tmp == host->last_busy)
2397                                         host->last_busy = prev;
2398                         }
2399                         tmp->hastat = HOST_ABORTED;
2400                         initio_append_done_scb(host, tmp);
2401                 }
2402                 /* Previous haven't change      */
2403                 else {
2404                         prev = tmp;
2405                 }
2406                 tmp = tmp->next;
2407         }
2408         outb(MSG_DEVRST, host->addr + TUL_SFifo);
2409         outb(TSC_XF_FIFO_OUT, host->addr + TUL_SCmd);
2410         return initio_wait_disc(host);
2411 
2412 }
2413 
2414 static int initio_msgin_accept(struct initio_host * host)
2415 {
2416         outb(TSC_MSG_ACCEPT, host->addr + TUL_SCmd);
2417         return wait_tulip(host);
2418 }
2419 
2420 static int wait_tulip(struct initio_host * host)
2421 {
2422 
2423         while (!((host->jsstatus0 = inb(host->addr + TUL_SStatus0))
2424                  & TSS_INT_PENDING))
2425                         cpu_relax();
2426 
2427         host->jsint = inb(host->addr + TUL_SInt);
2428         host->phase = host->jsstatus0 & TSS_PH_MASK;
2429         host->jsstatus1 = inb(host->addr + TUL_SStatus1);
2430 
2431         if (host->jsint & TSS_RESEL_INT)        /* if SCSI bus reset detected */
2432                 return int_initio_resel(host);
2433         if (host->jsint & TSS_SEL_TIMEOUT)      /* if selected/reselected timeout interrupt */
2434                 return int_initio_busfree(host);
2435         if (host->jsint & TSS_SCSIRST_INT)      /* if SCSI bus reset detected   */
2436                 return int_initio_scsi_rst(host);
2437 
2438         if (host->jsint & TSS_DISC_INT) {       /* BUS disconnection            */
2439                 if (host->flags & HCF_EXPECT_DONE_DISC) {
2440                         outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0); /* Flush SCSI FIFO */
2441                         initio_unlink_busy_scb(host, host->active);
2442                         host->active->hastat = 0;
2443                         initio_append_done_scb(host, host->active);
2444                         host->active = NULL;
2445                         host->active_tc = NULL;
2446                         host->flags &= ~HCF_EXPECT_DONE_DISC;
2447                         outb(TSC_INITDEFAULT, host->addr + TUL_SConfig);
2448                         outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1); /* Enable HW reselect */
2449                         return -1;
2450                 }
2451                 if (host->flags & HCF_EXPECT_DISC) {
2452                         outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0); /* Flush SCSI FIFO */
2453                         host->active = NULL;
2454                         host->active_tc = NULL;
2455                         host->flags &= ~HCF_EXPECT_DISC;
2456                         outb(TSC_INITDEFAULT, host->addr + TUL_SConfig);
2457                         outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1); /* Enable HW reselect */
2458                         return -1;
2459                 }
2460                 return int_initio_busfree(host);
2461         }
2462         /* The old code really does the below. Can probably be removed */
2463         if (host->jsint & (TSS_FUNC_COMP | TSS_BUS_SERV))
2464                 return host->phase;
2465         return host->phase;
2466 }
2467 
2468 static int initio_wait_disc(struct initio_host * host)
2469 {
2470         while (!((host->jsstatus0 = inb(host->addr + TUL_SStatus0)) & TSS_INT_PENDING))
2471                 cpu_relax();
2472 
2473         host->jsint = inb(host->addr + TUL_SInt);
2474 
2475         if (host->jsint & TSS_SCSIRST_INT)      /* if SCSI bus reset detected */
2476                 return int_initio_scsi_rst(host);
2477         if (host->jsint & TSS_DISC_INT) {       /* BUS disconnection */
2478                 outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0); /* Flush SCSI FIFO */
2479                 outb(TSC_INITDEFAULT, host->addr + TUL_SConfig);
2480                 outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1); /* Enable HW reselect */
2481                 host->active = NULL;
2482                 return -1;
2483         }
2484         return initio_bad_seq(host);
2485 }
2486 
2487 static int initio_wait_done_disc(struct initio_host * host)
2488 {
2489         while (!((host->jsstatus0 = inb(host->addr + TUL_SStatus0))
2490                  & TSS_INT_PENDING))
2491                  cpu_relax();
2492 
2493         host->jsint = inb(host->addr + TUL_SInt);
2494 
2495         if (host->jsint & TSS_SCSIRST_INT)      /* if SCSI bus reset detected */
2496                 return int_initio_scsi_rst(host);
2497         if (host->jsint & TSS_DISC_INT) {       /* BUS disconnection */
2498                 outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);          /* Flush SCSI FIFO */
2499                 outb(TSC_INITDEFAULT, host->addr + TUL_SConfig);
2500                 outb(TSC_HW_RESELECT, host->addr + TUL_SCtrl1);         /* Enable HW reselect */
2501                 initio_unlink_busy_scb(host, host->active);
2502 
2503                 initio_append_done_scb(host, host->active);
2504                 host->active = NULL;
2505                 return -1;
2506         }
2507         return initio_bad_seq(host);
2508 }
2509 
2510 /**
2511  *      i91u_intr               -       IRQ handler
2512  *      @irqno: IRQ number
2513  *      @dev_id: IRQ identifier
2514  *
2515  *      Take the relevant locks and then invoke the actual isr processing
2516  *      code under the lock.
2517  */
2518 
2519 static irqreturn_t i91u_intr(int irqno, void *dev_id)
2520 {
2521         struct Scsi_Host *dev = dev_id;
2522         unsigned long flags;
2523         int r;
2524         
2525         spin_lock_irqsave(dev->host_lock, flags);
2526         r = initio_isr((struct initio_host *)dev->hostdata);
2527         spin_unlock_irqrestore(dev->host_lock, flags);
2528         if (r)
2529                 return IRQ_HANDLED;
2530         else
2531                 return IRQ_NONE;
2532 }
2533 
2534 
2535 /**
2536  *      initio_build_scb                -       Build the mappings and SCB
2537  *      @host: InitIO host taking the command
2538  *      @cblk: Firmware command block
2539  *      @cmnd: SCSI midlayer command block
2540  *
2541  *      Translate the abstract SCSI command into a firmware command block
2542  *      suitable for feeding to the InitIO host controller. This also requires
2543  *      we build the scatter gather lists and ensure they are mapped properly.
2544  */
2545 
2546 static void initio_build_scb(struct initio_host * host, struct scsi_ctrl_blk * cblk, struct scsi_cmnd * cmnd)
2547 {                               /* Create corresponding SCB     */
2548         struct scatterlist *sglist;
2549         struct sg_entry *sg;            /* Pointer to SG list           */
2550         int i, nseg;
2551         long total_len;
2552         dma_addr_t dma_addr;
2553 
2554         /* Fill in the command headers */
2555         cblk->post = i91uSCBPost;       /* i91u's callback routine      */
2556         cblk->srb = cmnd;
2557         cblk->opcode = ExecSCSI;
2558         cblk->flags = SCF_POST; /* After SCSI done, call post routine */
2559         cblk->target = cmnd->device->id;
2560         cblk->lun = cmnd->device->lun;
2561         cblk->ident = cmnd->device->lun | DISC_ALLOW;
2562 
2563         cblk->flags |= SCF_SENSE;       /* Turn on auto request sense   */
2564 
2565         /* Map the sense buffer into bus memory */
2566         dma_addr = dma_map_single(&host->pci_dev->dev, cmnd->sense_buffer,
2567                                   SENSE_SIZE, DMA_FROM_DEVICE);
2568         cblk->senseptr = (u32)dma_addr;
2569         cblk->senselen = SENSE_SIZE;
2570         cmnd->SCp.ptr = (char *)(unsigned long)dma_addr;
2571         cblk->cdblen = cmnd->cmd_len;
2572 
2573         /* Clear the returned status */
2574         cblk->hastat = 0;
2575         cblk->tastat = 0;
2576         /* Command the command */
2577         memcpy(cblk->cdb, cmnd->cmnd, cmnd->cmd_len);
2578 
2579         /* Set up tags */
2580         if (cmnd->device->tagged_supported) {   /* Tag Support                  */
2581                 cblk->tagmsg = SIMPLE_QUEUE_TAG;        /* Do simple tag only   */
2582         } else {
2583                 cblk->tagmsg = 0;       /* No tag support               */
2584         }
2585 
2586         /* todo handle map_sg error */
2587         nseg = scsi_dma_map(cmnd);
2588         BUG_ON(nseg < 0);
2589         if (nseg) {
2590                 dma_addr = dma_map_single(&host->pci_dev->dev, &cblk->sglist[0],
2591                                           sizeof(struct sg_entry) * TOTAL_SG_ENTRY,
2592                                           DMA_BIDIRECTIONAL);
2593                 cblk->bufptr = (u32)dma_addr;
2594                 cmnd->SCp.dma_handle = dma_addr;
2595 
2596                 cblk->sglen = nseg;
2597 
2598                 cblk->flags |= SCF_SG;  /* Turn on SG list flag       */
2599                 total_len = 0;
2600                 sg = &cblk->sglist[0];
2601                 scsi_for_each_sg(cmnd, sglist, cblk->sglen, i) {
2602                         sg->data = cpu_to_le32((u32)sg_dma_address(sglist));
2603                         sg->len = cpu_to_le32((u32)sg_dma_len(sglist));
2604                         total_len += sg_dma_len(sglist);
2605                         ++sg;
2606                 }
2607 
2608                 cblk->buflen = (scsi_bufflen(cmnd) > total_len) ?
2609                         total_len : scsi_bufflen(cmnd);
2610         } else {        /* No data transfer required */
2611                 cblk->buflen = 0;
2612                 cblk->sglen = 0;
2613         }
2614 }
2615 
2616 /**
2617  *      i91u_queuecommand       -       Queue a new command if possible
2618  *      @cmd: SCSI command block from the mid layer
2619  *      @done: Completion handler
2620  *
2621  *      Attempts to queue a new command with the host adapter. Will return
2622  *      zero if successful or indicate a host busy condition if not (which
2623  *      will cause the mid layer to call us again later with the command)
2624  */
2625 
2626 static int i91u_queuecommand_lck(struct scsi_cmnd *cmd,
2627                 void (*done)(struct scsi_cmnd *))
2628 {
2629         struct initio_host *host = (struct initio_host *) cmd->device->host->hostdata;
2630         struct scsi_ctrl_blk *cmnd;
2631 
2632         cmd->scsi_done = done;
2633 
2634         cmnd = initio_alloc_scb(host);
2635         if (!cmnd)
2636                 return SCSI_MLQUEUE_HOST_BUSY;
2637 
2638         initio_build_scb(host, cmnd, cmd);
2639         initio_exec_scb(host, cmnd);
2640         return 0;
2641 }
2642 
2643 static DEF_SCSI_QCMD(i91u_queuecommand)
2644 
2645 /**
2646  *      i91u_bus_reset          -       reset the SCSI bus
2647  *      @cmnd: Command block we want to trigger the reset for
2648  *
2649  *      Initiate a SCSI bus reset sequence
2650  */
2651 
2652 static int i91u_bus_reset(struct scsi_cmnd * cmnd)
2653 {
2654         struct initio_host *host;
2655 
2656         host = (struct initio_host *) cmnd->device->host->hostdata;
2657 
2658         spin_lock_irq(cmnd->device->host->host_lock);
2659         initio_reset_scsi(host, 0);
2660         spin_unlock_irq(cmnd->device->host->host_lock);
2661 
2662         return SUCCESS;
2663 }
2664 
2665 /**
2666  *      i91u_biospararm                 -       return the "logical geometry
2667  *      @sdev: SCSI device
2668  *      @dev; Matching block device
2669  *      @capacity: Sector size of drive
2670  *      @info_array: Return space for BIOS geometry
2671  *
2672  *      Map the device geometry in a manner compatible with the host
2673  *      controller BIOS behaviour.
2674  *
2675  *      FIXME: limited to 2^32 sector devices.
2676  */
2677 
2678 static int i91u_biosparam(struct scsi_device *sdev, struct block_device *dev,
2679                 sector_t capacity, int *info_array)
2680 {
2681         struct initio_host *host;               /* Point to Host adapter control block */
2682         struct target_control *tc;
2683 
2684         host = (struct initio_host *) sdev->host->hostdata;
2685         tc = &host->targets[sdev->id];
2686 
2687         if (tc->heads) {
2688                 info_array[0] = tc->heads;
2689                 info_array[1] = tc->sectors;
2690                 info_array[2] = (unsigned long)capacity / tc->heads / tc->sectors;
2691         } else {
2692                 if (tc->drv_flags & TCF_DRV_255_63) {
2693                         info_array[0] = 255;
2694                         info_array[1] = 63;
2695                         info_array[2] = (unsigned long)capacity / 255 / 63;
2696                 } else {
2697                         info_array[0] = 64;
2698                         info_array[1] = 32;
2699                         info_array[2] = (unsigned long)capacity >> 11;
2700                 }
2701         }
2702 
2703 #if defined(DEBUG_BIOSPARAM)
2704         if (i91u_debug & debug_biosparam) {
2705                 printk("bios geometry: head=%d, sec=%d, cyl=%d\n",
2706                        info_array[0], info_array[1], info_array[2]);
2707                 printk("WARNING: check, if the bios geometry is correct.\n");
2708         }
2709 #endif
2710 
2711         return 0;
2712 }
2713 
2714 /**
2715  *      i91u_unmap_scb          -       Unmap a command
2716  *      @pci_dev: PCI device the command is for
2717  *      @cmnd: The command itself
2718  *
2719  *      Unmap any PCI mapping/IOMMU resources allocated when the command
2720  *      was mapped originally as part of initio_build_scb
2721  */
2722 
2723 static void i91u_unmap_scb(struct pci_dev *pci_dev, struct scsi_cmnd *cmnd)
2724 {
2725         /* auto sense buffer */
2726         if (cmnd->SCp.ptr) {
2727                 dma_unmap_single(&pci_dev->dev,
2728                                  (dma_addr_t)((unsigned long)cmnd->SCp.ptr),
2729                                  SENSE_SIZE, DMA_FROM_DEVICE);
2730                 cmnd->SCp.ptr = NULL;
2731         }
2732 
2733         /* request buffer */
2734         if (scsi_sg_count(cmnd)) {
2735                 dma_unmap_single(&pci_dev->dev, cmnd->SCp.dma_handle,
2736                                  sizeof(struct sg_entry) * TOTAL_SG_ENTRY,
2737                                  DMA_BIDIRECTIONAL);
2738 
2739                 scsi_dma_unmap(cmnd);
2740         }
2741 }
2742 
2743 /**
2744  *      i91uSCBPost             -       SCSI callback
2745  *      @host: Pointer to host adapter control block.
2746  *      @cmnd: Pointer to SCSI control block.
2747  *
2748  *      This is callback routine be called when tulip finish one
2749  *      SCSI command.
2750  */
2751 
2752 static void i91uSCBPost(u8 * host_mem, u8 * cblk_mem)
2753 {
2754         struct scsi_cmnd *cmnd; /* Pointer to SCSI request block */
2755         struct initio_host *host;
2756         struct scsi_ctrl_blk *cblk;
2757 
2758         host = (struct initio_host *) host_mem;
2759         cblk = (struct scsi_ctrl_blk *) cblk_mem;
2760         if ((cmnd = cblk->srb) == NULL) {
2761                 printk(KERN_ERR "i91uSCBPost: SRB pointer is empty\n");
2762                 WARN_ON(1);
2763                 initio_release_scb(host, cblk); /* Release SCB for current channel */
2764                 return;
2765         }
2766 
2767         /*
2768          *      Remap the firmware error status into a mid layer one
2769          */
2770         switch (cblk->hastat) {
2771         case 0x0:
2772         case 0xa:               /* Linked command complete without error and linked normally */
2773         case 0xb:               /* Linked command complete without error interrupt generated */
2774                 cblk->hastat = 0;
2775                 break;
2776 
2777         case 0x11:              /* Selection time out-The initiator selection or target
2778                                    reselection was not complete within the SCSI Time out period */
2779                 cblk->hastat = DID_TIME_OUT;
2780                 break;
2781 
2782         case 0x14:              /* Target bus phase sequence failure-An invalid bus phase or bus
2783                                    phase sequence was requested by the target. The host adapter
2784                                    will generate a SCSI Reset Condition, notifying the host with
2785                                    a SCRD interrupt */
2786                 cblk->hastat = DID_RESET;
2787                 break;
2788 
2789         case 0x1a:              /* SCB Aborted. 07/21/98 */
2790                 cblk->hastat = DID_ABORT;
2791                 break;
2792 
2793         case 0x12:              /* Data overrun/underrun-The target attempted to transfer more data
2794                                    than was allocated by the Data Length field or the sum of the
2795                                    Scatter / Gather Data Length fields. */
2796         case 0x13:              /* Unexpected bus free-The target dropped the SCSI BSY at an unexpected time. */
2797         case 0x16:              /* Invalid SCB Operation Code. */
2798 
2799         default:
2800                 printk("ini9100u: %x %x\n", cblk->hastat, cblk->tastat);
2801                 cblk->hastat = DID_ERROR;       /* Couldn't find any better */
2802                 break;
2803         }
2804 
2805         cmnd->result = cblk->tastat | (cblk->hastat << 16);
2806         i91u_unmap_scb(host->pci_dev, cmnd);
2807         cmnd->scsi_done(cmnd);  /* Notify system DONE           */
2808         initio_release_scb(host, cblk); /* Release SCB for current channel */
2809 }
2810 
2811 static struct scsi_host_template initio_template = {
2812         .proc_name              = "INI9100U",
2813         .name                   = "Initio INI-9X00U/UW SCSI device driver",
2814         .queuecommand           = i91u_queuecommand,
2815         .eh_bus_reset_handler   = i91u_bus_reset,
2816         .bios_param             = i91u_biosparam,
2817         .can_queue              = MAX_TARGETS * i91u_MAXQUEUE,
2818         .this_id                = 1,
2819         .sg_tablesize           = SG_ALL,
2820         .use_clustering         = ENABLE_CLUSTERING,
2821 };
2822 
2823 static int initio_probe_one(struct pci_dev *pdev,
2824         const struct pci_device_id *id)
2825 {
2826         struct Scsi_Host *shost;
2827         struct initio_host *host;
2828         u32 reg;
2829         u16 bios_seg;
2830         struct scsi_ctrl_blk *scb, *tmp, *prev = NULL /* silence gcc */;
2831         int num_scb, i, error;
2832 
2833         error = pci_enable_device(pdev);
2834         if (error)
2835                 return error;
2836 
2837         pci_read_config_dword(pdev, 0x44, (u32 *) & reg);
2838         bios_seg = (u16) (reg & 0xFF);
2839         if (((reg & 0xFF00) >> 8) == 0xFF)
2840                 reg = 0;
2841         bios_seg = (bios_seg << 8) + ((u16) ((reg & 0xFF00) >> 8));
2842 
2843         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
2844                 printk(KERN_WARNING  "i91u: Could not set 32 bit DMA mask\n");
2845                 error = -ENODEV;
2846                 goto out_disable_device;
2847         }
2848         shost = scsi_host_alloc(&initio_template, sizeof(struct initio_host));
2849         if (!shost) {
2850                 printk(KERN_WARNING "initio: Could not allocate host structure.\n");
2851                 error = -ENOMEM;
2852                 goto out_disable_device;
2853         }
2854         host = (struct initio_host *)shost->hostdata;
2855         memset(host, 0, sizeof(struct initio_host));
2856         host->addr = pci_resource_start(pdev, 0);
2857         host->bios_addr = bios_seg;
2858 
2859         if (!request_region(host->addr, 256, "i91u")) {
2860                 printk(KERN_WARNING "initio: I/O port range 0x%x is busy.\n", host->addr);
2861                 error = -ENODEV;
2862                 goto out_host_put;
2863         }
2864 
2865         if (initio_tag_enable)  /* 1.01i */
2866                 num_scb = MAX_TARGETS * i91u_MAXQUEUE;
2867         else
2868                 num_scb = MAX_TARGETS + 3;      /* 1-tape, 1-CD_ROM, 1- extra */
2869 
2870         for (; num_scb >= MAX_TARGETS + 3; num_scb--) {
2871                 i = num_scb * sizeof(struct scsi_ctrl_blk);
2872                 if ((scb = kzalloc(i, GFP_DMA)) != NULL)
2873                         break;
2874         }
2875 
2876         if (!scb) {
2877                 printk(KERN_WARNING "initio: Cannot allocate SCB array.\n");
2878                 error = -ENOMEM;
2879                 goto out_release_region;
2880         }
2881 
2882         host->pci_dev = pdev;
2883 
2884         host->semaph = 1;
2885         spin_lock_init(&host->semaph_lock);
2886         host->num_scbs = num_scb;
2887         host->scb = scb;
2888         host->next_pending = scb;
2889         host->next_avail = scb;
2890         for (i = 0, tmp = scb; i < num_scb; i++, tmp++) {
2891                 tmp->tagid = i;
2892                 if (i != 0)
2893                         prev->next = tmp;
2894                 prev = tmp;
2895         }
2896         prev->next = NULL;
2897         host->scb_end = tmp;
2898         host->first_avail = scb;
2899         host->last_avail = prev;
2900         spin_lock_init(&host->avail_lock);
2901 
2902         initio_init(host, phys_to_virt(((u32)bios_seg << 4)));
2903 
2904         host->jsstatus0 = 0;
2905 
2906         shost->io_port = host->addr;
2907         shost->n_io_port = 0xff;
2908         shost->can_queue = num_scb;             /* 03/05/98                      */
2909         shost->unique_id = host->addr;
2910         shost->max_id = host->max_tar;
2911         shost->max_lun = 32;    /* 10/21/97                     */
2912         shost->irq = pdev->irq;
2913         shost->this_id = host->scsi_id; /* Assign HCS index           */
2914         shost->base = host->addr;
2915         shost->sg_tablesize = TOTAL_SG_ENTRY;
2916 
2917         error = request_irq(pdev->irq, i91u_intr, IRQF_SHARED, "i91u", shost);
2918         if (error < 0) {
2919                 printk(KERN_WARNING "initio: Unable to request IRQ %d\n", pdev->irq);
2920                 goto out_free_scbs;
2921         }
2922 
2923         pci_set_drvdata(pdev, shost);
2924 
2925         error = scsi_add_host(shost, &pdev->dev);
2926         if (error)
2927                 goto out_free_irq;
2928         scsi_scan_host(shost);
2929         return 0;
2930 out_free_irq:
2931         free_irq(pdev->irq, shost);
2932 out_free_scbs:
2933         kfree(host->scb);
2934 out_release_region:
2935         release_region(host->addr, 256);
2936 out_host_put:
2937         scsi_host_put(shost);
2938 out_disable_device:
2939         pci_disable_device(pdev);
2940         return error;
2941 }
2942 
2943 /**
2944  *      initio_remove_one       -       control shutdown
2945  *      @pdev:  PCI device being released
2946  *
2947  *      Release the resources assigned to this adapter after it has
2948  *      finished being used.
2949  */
2950 
2951 static void initio_remove_one(struct pci_dev *pdev)
2952 {
2953         struct Scsi_Host *host = pci_get_drvdata(pdev);
2954         struct initio_host *s = (struct initio_host *)host->hostdata;
2955         scsi_remove_host(host);
2956         free_irq(pdev->irq, host);
2957         release_region(s->addr, 256);
2958         scsi_host_put(host);
2959         pci_disable_device(pdev);
2960 }
2961 
2962 MODULE_LICENSE("GPL");
2963 
2964 static struct pci_device_id initio_pci_tbl[] = {
2965         {PCI_VENDOR_ID_INIT, 0x9500, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
2966         {PCI_VENDOR_ID_INIT, 0x9400, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
2967         {PCI_VENDOR_ID_INIT, 0x9401, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
2968         {PCI_VENDOR_ID_INIT, 0x0002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
2969         {PCI_VENDOR_ID_DOMEX, 0x0002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
2970         {0,}
2971 };
2972 MODULE_DEVICE_TABLE(pci, initio_pci_tbl);
2973 
2974 static struct pci_driver initio_pci_driver = {
2975         .name           = "initio",
2976         .id_table       = initio_pci_tbl,
2977         .probe          = initio_probe_one,
2978         .remove         = initio_remove_one,
2979 };
2980 
2981 static int __init initio_init_driver(void)
2982 {
2983         return pci_register_driver(&initio_pci_driver);
2984 }
2985 
2986 static void __exit initio_exit_driver(void)
2987 {
2988         pci_unregister_driver(&initio_pci_driver);
2989 }
2990 
2991 MODULE_DESCRIPTION("Initio INI-9X00U/UW SCSI device driver");
2992 MODULE_AUTHOR("Initio Corporation");
2993 MODULE_LICENSE("GPL");
2994 
2995 module_init(initio_init_driver);
2996 module_exit(initio_exit_driver);
2997 

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