1 /* imm.c -- low level driver for the IOMEGA MatchMaker
2 * parallel port SCSI host adapter.
4 * (The IMM is the embedded controller in the ZIP Plus drive.)
6 * My unoffical company acronym list is 21 pages long:
7 * FLA: Four letter acronym with built in facility for
8 * future expansion to five letters.
11 #include <linux/config.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/blkdev.h>
16 #include <linux/parport.h>
17 #include <linux/workqueue.h>
18 #include <linux/delay.h>
21 #include <scsi/scsi.h>
22 #include <scsi/scsi_cmnd.h>
23 #include <scsi/scsi_device.h>
24 #include <scsi/scsi_host.h>
26 /* The following #define is to avoid a clash with hosts.c */
27 #define IMM_PROBE_SPP 0x0001
28 #define IMM_PROBE_PS2 0x0002
29 #define IMM_PROBE_ECR 0x0010
30 #define IMM_PROBE_EPP17 0x0100
31 #define IMM_PROBE_EPP19 0x0200
35 struct pardevice
*dev
; /* Parport device entry */
36 int base
; /* Actual port address */
37 int base_hi
; /* Hi Base address for ECP-ISA chipset */
38 int mode
; /* Transfer mode */
39 struct scsi_cmnd
*cur_cmd
; /* Current queued command */
40 struct work_struct imm_tq
; /* Polling interrupt stuff */
41 unsigned long jstart
; /* Jiffies at start */
42 unsigned failed
:1; /* Failure flag */
43 unsigned dp
:1; /* Data phase present */
44 unsigned rd
:1; /* Read data in data phase */
45 unsigned wanted
:1; /* Parport sharing busy flag */
46 wait_queue_head_t
*waiting
;
47 struct Scsi_Host
*host
;
48 struct list_head list
;
51 static void imm_reset_pulse(unsigned int base
);
52 static int device_check(imm_struct
*dev
);
56 static inline imm_struct
*imm_dev(struct Scsi_Host
*host
)
58 return *(imm_struct
**)&host
->hostdata
;
61 static DEFINE_SPINLOCK(arbitration_lock
);
63 static void got_it(imm_struct
*dev
)
65 dev
->base
= dev
->dev
->port
->base
;
67 dev
->cur_cmd
->SCp
.phase
= 1;
69 wake_up(dev
->waiting
);
72 static void imm_wakeup(void *ref
)
74 imm_struct
*dev
= (imm_struct
*) ref
;
77 spin_lock_irqsave(&arbitration_lock
, flags
);
79 parport_claim(dev
->dev
);
83 spin_unlock_irqrestore(&arbitration_lock
, flags
);
86 static int imm_pb_claim(imm_struct
*dev
)
90 spin_lock_irqsave(&arbitration_lock
, flags
);
91 if (parport_claim(dev
->dev
) == 0) {
96 spin_unlock_irqrestore(&arbitration_lock
, flags
);
100 static void imm_pb_dismiss(imm_struct
*dev
)
104 spin_lock_irqsave(&arbitration_lock
, flags
);
105 wanted
= dev
->wanted
;
107 spin_unlock_irqrestore(&arbitration_lock
, flags
);
109 parport_release(dev
->dev
);
112 static inline void imm_pb_release(imm_struct
*dev
)
114 parport_release(dev
->dev
);
117 /* This is to give the imm driver a way to modify the timings (and other
118 * parameters) by writing to the /proc/scsi/imm/0 file.
119 * Very simple method really... (Too simple, no error checking :( )
120 * Reason: Kernel hackers HATE having to unload and reload modules for
122 * Also gives a method to use a script to obtain optimum timings (TODO)
124 static inline int imm_proc_write(imm_struct
*dev
, char *buffer
, int length
)
128 if ((length
> 5) && (strncmp(buffer
, "mode=", 5) == 0)) {
129 x
= simple_strtoul(buffer
+ 5, NULL
, 0);
133 printk("imm /proc: invalid variable\n");
137 static int imm_proc_info(struct Scsi_Host
*host
, char *buffer
, char **start
,
138 off_t offset
, int length
, int inout
)
140 imm_struct
*dev
= imm_dev(host
);
144 return imm_proc_write(dev
, buffer
, length
);
146 len
+= sprintf(buffer
+ len
, "Version : %s\n", IMM_VERSION
);
148 sprintf(buffer
+ len
, "Parport : %s\n",
149 dev
->dev
->port
->name
);
151 sprintf(buffer
+ len
, "Mode : %s\n",
152 IMM_MODE_STRING
[dev
->mode
]);
154 /* Request for beyond end of buffer */
158 *start
= buffer
+ offset
;
166 #define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\
167 y, __FUNCTION__, __LINE__); imm_fail_func(x,y);
169 imm_fail_func(imm_struct
*dev
, int error_code
)
172 imm_fail(imm_struct
*dev
, int error_code
)
175 /* If we fail a device then we trash status / message bytes */
177 dev
->cur_cmd
->result
= error_code
<< 16;
183 * Wait for the high bit to be set.
185 * In principle, this could be tied to an interrupt, but the adapter
186 * doesn't appear to be designed to support interrupts. We spin on
187 * the 0x80 ready bit.
189 static unsigned char imm_wait(imm_struct
*dev
)
192 unsigned short ppb
= dev
->base
;
203 while (!(r
& 0x80) && (k
));
206 * STR register (LPT base+1) to SCSI mapping:
209 * ===================================
217 * ==================================
219 * 0xc0 0x88 ZIP wants more data
220 * 0xd0 0x98 ZIP wants to send more data
221 * 0xe0 0xa8 ZIP is expecting SCSI command data
222 * 0xf0 0xb8 end of transfer, ZIP is sending status
228 /* Counter expired - Time out occurred */
229 imm_fail(dev
, DID_TIME_OUT
);
230 printk("imm timeout in imm_wait\n");
231 return 0; /* command timed out */
234 static int imm_negotiate(imm_struct
* tmp
)
237 * The following is supposedly the IEEE 1284-1994 negotiate
238 * sequence. I have yet to obtain a copy of the above standard
239 * so this is a bit of a guess...
241 * A fair chunk of this is based on the Linux parport implementation
244 * Return 0 if data available
245 * 1 if no data available
248 unsigned short base
= tmp
->base
;
249 unsigned char a
, mode
;
268 a
= (r_str(base
) & 0x20) ? 0 : 1;
276 ("IMM: IEEE1284 negotiate indicates no data available.\n");
277 imm_fail(tmp
, DID_ERROR
);
283 * Clear EPP timeout bit.
285 static inline void epp_reset(unsigned short ppb
)
291 w_str(ppb
, i
& 0xfe);
295 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
297 static inline void ecp_sync(imm_struct
*dev
)
299 int i
, ppb_hi
= dev
->base_hi
;
304 if ((r_ecr(ppb_hi
) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
305 for (i
= 0; i
< 100; i
++) {
306 if (r_ecr(ppb_hi
) & 0x01)
310 printk("imm: ECP sync failed as data still present in FIFO.\n");
314 static int imm_byte_out(unsigned short base
, const char *buffer
, int len
)
318 w_ctr(base
, 0x4); /* apparently a sane mode */
319 for (i
= len
>> 1; i
; i
--) {
320 w_dtr(base
, *buffer
++);
321 w_ctr(base
, 0x5); /* Drop STROBE low */
322 w_dtr(base
, *buffer
++);
323 w_ctr(base
, 0x0); /* STROBE high + INIT low */
325 w_ctr(base
, 0x4); /* apparently a sane mode */
326 return 1; /* All went well - we hope! */
329 static int imm_nibble_in(unsigned short base
, char *buffer
, int len
)
335 * The following is based on documented timing signals
338 for (i
= len
; i
; i
--) {
340 l
= (r_str(base
) & 0xf0) >> 4;
342 *buffer
++ = (r_str(base
) & 0xf0) | l
;
345 return 1; /* All went well - we hope! */
348 static int imm_byte_in(unsigned short base
, char *buffer
, int len
)
353 * The following is based on documented timing signals
356 for (i
= len
; i
; i
--) {
358 *buffer
++ = r_dtr(base
);
361 return 1; /* All went well - we hope! */
364 static int imm_out(imm_struct
*dev
, char *buffer
, int len
)
366 unsigned short ppb
= dev
->base
;
367 int r
= imm_wait(dev
);
371 * a) the SCSI bus is BUSY (device still listening)
372 * b) the device is listening
374 if ((r
& 0x18) != 0x08) {
375 imm_fail(dev
, DID_ERROR
);
376 printk("IMM: returned SCSI status %2x\n", r
);
385 #ifdef CONFIG_SCSI_IZIP_EPP16
386 if (!(((long) buffer
| len
) & 0x01))
387 outsw(ppb
+ 4, buffer
, len
>> 1);
389 if (!(((long) buffer
| len
) & 0x03))
390 outsl(ppb
+ 4, buffer
, len
>> 2);
393 outsb(ppb
+ 4, buffer
, len
);
395 r
= !(r_str(ppb
) & 0x01);
402 /* 8 bit output, with a loop */
403 r
= imm_byte_out(ppb
, buffer
, len
);
407 printk("IMM: bug in imm_out()\n");
413 static int imm_in(imm_struct
*dev
, char *buffer
, int len
)
415 unsigned short ppb
= dev
->base
;
416 int r
= imm_wait(dev
);
420 * a) the SCSI bus is BUSY (device still listening)
421 * b) the device is sending data
423 if ((r
& 0x18) != 0x18) {
424 imm_fail(dev
, DID_ERROR
);
429 /* 4 bit input, with a loop */
430 r
= imm_nibble_in(ppb
, buffer
, len
);
435 /* 8 bit input, with a loop */
436 r
= imm_byte_in(ppb
, buffer
, len
);
445 #ifdef CONFIG_SCSI_IZIP_EPP16
446 if (!(((long) buffer
| len
) & 0x01))
447 insw(ppb
+ 4, buffer
, len
>> 1);
449 if (!(((long) buffer
| len
) & 0x03))
450 insl(ppb
+ 4, buffer
, len
>> 2);
453 insb(ppb
+ 4, buffer
, len
);
455 r
= !(r_str(ppb
) & 0x01);
461 printk("IMM: bug in imm_ins()\n");
468 static int imm_cpp(unsigned short ppb
, unsigned char b
)
471 * Comments on udelay values refer to the
472 * Command Packet Protocol (CPP) timing diagram.
475 unsigned char s1
, s2
, s3
;
477 udelay(2); /* 1 usec - infinite */
479 udelay(10); /* 7 usec - infinite */
481 udelay(10); /* 7 usec - infinite */
483 udelay(10); /* 7 usec - infinite */
485 udelay(10); /* 7 usec - infinite */
486 s1
= r_str(ppb
) & 0xb8;
488 udelay(10); /* 7 usec - infinite */
489 s2
= r_str(ppb
) & 0xb8;
491 udelay(10); /* 7 usec - infinite */
492 s3
= r_str(ppb
) & 0x38;
495 * 0000 00aa Assign address aa to current device
496 * 0010 00aa Select device aa in EPP Winbond mode
497 * 0010 10aa Select device aa in EPP mode
498 * 0011 xxxx Deselect all devices
499 * 0110 00aa Test device aa
500 * 1101 00aa Select device aa in ECP mode
501 * 1110 00aa Select device aa in Compatible mode
504 udelay(2); /* 1 usec - infinite */
506 udelay(10); /* 7 usec - infinite */
508 udelay(2); /* 1 usec - infinite */
510 udelay(10); /* 7 usec - infinite */
512 udelay(10); /* 7 usec - infinite */
515 * The following table is electrical pin values.
516 * (BSY is inverted at the CTR register)
518 * BSY ACK POut SEL Fault
523 * L => Last device in chain
526 * Observered values for S1,S2,S3 are:
527 * Disconnect => f8/58/78
528 * Connect => f8/58/70
530 if ((s1
== 0xb8) && (s2
== 0x18) && (s3
== 0x30))
531 return 1; /* Connected */
532 if ((s1
== 0xb8) && (s2
== 0x18) && (s3
== 0x38))
533 return 0; /* Disconnected */
535 return -1; /* No device present */
538 static inline int imm_connect(imm_struct
*dev
, int flag
)
540 unsigned short ppb
= dev
->base
;
542 imm_cpp(ppb
, 0xe0); /* Select device 0 in compatible mode */
543 imm_cpp(ppb
, 0x30); /* Disconnect all devices */
545 if ((dev
->mode
== IMM_EPP_8
) ||
546 (dev
->mode
== IMM_EPP_16
) ||
547 (dev
->mode
== IMM_EPP_32
))
548 return imm_cpp(ppb
, 0x28); /* Select device 0 in EPP mode */
549 return imm_cpp(ppb
, 0xe0); /* Select device 0 in compatible mode */
552 static void imm_disconnect(imm_struct
*dev
)
554 imm_cpp(dev
->base
, 0x30); /* Disconnect all devices */
557 static int imm_select(imm_struct
*dev
, int target
)
560 unsigned short ppb
= dev
->base
;
563 * Firstly we want to make sure there is nothing
564 * holding onto the SCSI bus.
571 } while ((r_str(ppb
) & 0x08) && (k
));
577 * Now assert the SCSI ID (HOST and TARGET) on the data bus
580 w_dtr(ppb
, 0x80 | (1 << target
));
584 * Deassert SELIN first followed by STROBE
590 * ACK should drop low while SELIN is deasserted.
591 * FAULT should drop low when the SCSI device latches the bus.
597 while (!(r_str(ppb
) & 0x08) && (k
));
600 * Place the interface back into a sane state (status mode)
606 static int imm_init(imm_struct
*dev
)
608 if (imm_connect(dev
, 0) != 1)
610 imm_reset_pulse(dev
->base
);
611 mdelay(1); /* Delay to allow devices to settle */
613 mdelay(1); /* Another delay to allow devices to settle */
614 return device_check(dev
);
617 static inline int imm_send_command(struct scsi_cmnd
*cmd
)
619 imm_struct
*dev
= imm_dev(cmd
->device
->host
);
622 /* NOTE: IMM uses byte pairs */
623 for (k
= 0; k
< cmd
->cmd_len
; k
+= 2)
624 if (!imm_out(dev
, &cmd
->cmnd
[k
], 2))
630 * The bulk flag enables some optimisations in the data transfer loops,
631 * it should be true for any command that transfers data in integral
632 * numbers of sectors.
634 * The driver appears to remain stable if we speed up the parallel port
635 * i/o in this function, but not elsewhere.
637 static int imm_completion(struct scsi_cmnd
*cmd
)
642 * 1 Finished data transfer
644 imm_struct
*dev
= imm_dev(cmd
->device
->host
);
645 unsigned short ppb
= dev
->base
;
646 unsigned long start_jiffies
= jiffies
;
649 int fast
, bulk
, status
;
652 bulk
= ((v
== READ_6
) ||
653 (v
== READ_10
) || (v
== WRITE_6
) || (v
== WRITE_10
));
656 * We only get here if the drive is ready to comunicate,
657 * hence no need for a full imm_wait.
660 r
= (r_str(ppb
) & 0xb8);
663 * while (device is not ready to send status byte)
666 while (r
!= (unsigned char) 0xb8) {
668 * If we have been running for more than a full timer tick
671 if (time_after(jiffies
, start_jiffies
+ 1))
676 * a) Drive status is screwy (!ready && !present)
677 * b) Drive is requesting/sending more data than expected
679 if (((r
& 0x88) != 0x88) || (cmd
->SCp
.this_residual
<= 0)) {
680 imm_fail(dev
, DID_ERROR
);
681 return -1; /* ERROR_RETURN */
683 /* determine if we should use burst I/O */
686 && (cmd
->SCp
.this_residual
>=
687 IMM_BURST_SIZE
)) ? IMM_BURST_SIZE
: 2;
688 status
= imm_out(dev
, cmd
->SCp
.ptr
, fast
);
691 && (cmd
->SCp
.this_residual
>=
692 IMM_BURST_SIZE
)) ? IMM_BURST_SIZE
: 1;
693 status
= imm_in(dev
, cmd
->SCp
.ptr
, fast
);
696 cmd
->SCp
.ptr
+= fast
;
697 cmd
->SCp
.this_residual
-= fast
;
700 imm_fail(dev
, DID_BUS_BUSY
);
701 return -1; /* ERROR_RETURN */
703 if (cmd
->SCp
.buffer
&& !cmd
->SCp
.this_residual
) {
704 /* if scatter/gather, advance to the next segment */
705 if (cmd
->SCp
.buffers_residual
--) {
707 cmd
->SCp
.this_residual
=
708 cmd
->SCp
.buffer
->length
;
710 page_address(cmd
->SCp
.buffer
->page
) +
711 cmd
->SCp
.buffer
->offset
;
714 * Make sure that we transfer even number of bytes
715 * otherwise it makes imm_byte_out() messy.
717 if (cmd
->SCp
.this_residual
& 0x01)
718 cmd
->SCp
.this_residual
++;
721 /* Now check to see if the drive is ready to comunicate */
723 r
= (r_str(ppb
) & 0xb8);
725 /* If not, drop back down to the scheduler and wait a timer tick */
729 return 1; /* FINISH_RETURN */
733 * Since the IMM itself doesn't generate interrupts, we use
734 * the scheduler's task queue to generate a stream of call-backs and
735 * complete the request when the drive is ready.
737 static void imm_interrupt(void *data
)
739 imm_struct
*dev
= (imm_struct
*) data
;
740 struct scsi_cmnd
*cmd
= dev
->cur_cmd
;
741 struct Scsi_Host
*host
= cmd
->device
->host
;
745 printk("IMM: bug in imm_interrupt\n");
748 if (imm_engine(dev
, cmd
)) {
749 INIT_WORK(&dev
->imm_tq
, imm_interrupt
, (void *) dev
);
750 schedule_delayed_work(&dev
->imm_tq
, 1);
753 /* Command must of completed hence it is safe to let go... */
755 switch ((cmd
->result
>> 16) & 0xff) {
759 printk("imm: no device at SCSI ID %i\n", cmd
->device
->id
);
762 printk("imm: BUS BUSY - EPP timeout detected\n");
765 printk("imm: unknown timeout\n");
768 printk("imm: told to abort\n");
771 printk("imm: parity error (???)\n");
774 printk("imm: internal driver error\n");
777 printk("imm: told to reset device\n");
780 printk("imm: bad interrupt (???)\n");
783 printk("imm: bad return code (%02x)\n",
784 (cmd
->result
>> 16) & 0xff);
788 if (cmd
->SCp
.phase
> 1)
793 spin_lock_irqsave(host
->host_lock
, flags
);
796 spin_unlock_irqrestore(host
->host_lock
, flags
);
800 static int imm_engine(imm_struct
*dev
, struct scsi_cmnd
*cmd
)
802 unsigned short ppb
= dev
->base
;
803 unsigned char l
= 0, h
= 0;
806 /* First check for any errors that may have occurred
807 * Here we check for internal errors
812 switch (cmd
->SCp
.phase
) {
813 case 0: /* Phase 0 - Waiting for parport */
814 if (time_after(jiffies
, dev
->jstart
+ HZ
)) {
816 * We waited more than a second
817 * for parport to call us
819 imm_fail(dev
, DID_BUS_BUSY
);
822 return 1; /* wait until imm_wakeup claims parport */
823 /* Phase 1 - Connected */
825 imm_connect(dev
, CONNECT_EPP_MAYBE
);
828 /* Phase 2 - We are now talking to the scsi bus */
830 if (!imm_select(dev
, scmd_id(cmd
))) {
831 imm_fail(dev
, DID_NO_CONNECT
);
836 /* Phase 3 - Ready to accept a command */
839 if (!(r_str(ppb
) & 0x80))
842 if (!imm_send_command(cmd
))
846 /* Phase 4 - Setup scatter/gather buffers */
849 /* if many buffers are available, start filling the first */
851 (struct scatterlist
*) cmd
->request_buffer
;
852 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
854 page_address(cmd
->SCp
.buffer
->page
) +
855 cmd
->SCp
.buffer
->offset
;
857 /* else fill the only available buffer */
858 cmd
->SCp
.buffer
= NULL
;
859 cmd
->SCp
.this_residual
= cmd
->request_bufflen
;
860 cmd
->SCp
.ptr
= cmd
->request_buffer
;
862 cmd
->SCp
.buffers_residual
= cmd
->use_sg
- 1;
864 if (cmd
->SCp
.this_residual
& 0x01)
865 cmd
->SCp
.this_residual
++;
866 /* Phase 5 - Pre-Data transfer stage */
868 /* Spin lock for BUSY */
870 if (!(r_str(ppb
) & 0x80))
873 /* Require negotiation for read requests */
874 x
= (r_str(ppb
) & 0xb8);
875 dev
->rd
= (x
& 0x10) ? 1 : 0;
876 dev
->dp
= (x
& 0x20) ? 0 : 1;
878 if ((dev
->dp
) && (dev
->rd
))
879 if (imm_negotiate(dev
))
883 /* Phase 6 - Data transfer stage */
885 /* Spin lock for BUSY */
887 if (!(r_str(ppb
) & 0x80))
891 retv
= imm_completion(cmd
);
899 /* Phase 7 - Post data transfer stage */
901 if ((dev
->dp
) && (dev
->rd
)) {
902 if ((dev
->mode
== IMM_NIBBLE
) || (dev
->mode
== IMM_PS2
)) {
911 /* Phase 8 - Read status/message */
913 /* Check for data overrun */
914 if (imm_wait(dev
) != (unsigned char) 0xb8) {
915 imm_fail(dev
, DID_ERROR
);
918 if (imm_negotiate(dev
))
920 if (imm_in(dev
, &l
, 1)) { /* read status byte */
921 /* Check for optional message byte */
922 if (imm_wait(dev
) == (unsigned char) 0xb8)
924 cmd
->result
= (DID_OK
<< 16) + (l
& STATUS_MASK
);
926 if ((dev
->mode
== IMM_NIBBLE
) || (dev
->mode
== IMM_PS2
)) {
932 return 0; /* Finished */
936 printk("imm: Invalid scsi phase\n");
941 static int imm_queuecommand(struct scsi_cmnd
*cmd
,
942 void (*done
)(struct scsi_cmnd
*))
944 imm_struct
*dev
= imm_dev(cmd
->device
->host
);
947 printk("IMM: bug in imm_queuecommand\n");
951 dev
->jstart
= jiffies
;
953 cmd
->scsi_done
= done
;
954 cmd
->result
= DID_ERROR
<< 16; /* default return code */
955 cmd
->SCp
.phase
= 0; /* bus free */
957 INIT_WORK(&dev
->imm_tq
, imm_interrupt
, dev
);
958 schedule_work(&dev
->imm_tq
);
966 * Apparently the disk->capacity attribute is off by 1 sector
967 * for all disk drives. We add the one here, but it should really
968 * be done in sd.c. Even if it gets fixed there, this will still
971 static int imm_biosparam(struct scsi_device
*sdev
, struct block_device
*dev
,
972 sector_t capacity
, int ip
[])
976 ip
[2] = ((unsigned long) capacity
+ 1) / (ip
[0] * ip
[1]);
980 ip
[2] = ((unsigned long) capacity
+ 1) / (ip
[0] * ip
[1]);
985 static int imm_abort(struct scsi_cmnd
*cmd
)
987 imm_struct
*dev
= imm_dev(cmd
->device
->host
);
989 * There is no method for aborting commands since Iomega
990 * have tied the SCSI_MESSAGE line high in the interface
993 switch (cmd
->SCp
.phase
) {
994 case 0: /* Do not have access to parport */
995 case 1: /* Have not connected to interface */
996 dev
->cur_cmd
= NULL
; /* Forget the problem */
999 default: /* SCSI command sent, can not abort */
1005 static void imm_reset_pulse(unsigned int base
)
1017 static int imm_reset(struct scsi_cmnd
*cmd
)
1019 imm_struct
*dev
= imm_dev(cmd
->device
->host
);
1022 imm_disconnect(dev
);
1023 dev
->cur_cmd
= NULL
; /* Forget the problem */
1025 imm_connect(dev
, CONNECT_NORMAL
);
1026 imm_reset_pulse(dev
->base
);
1027 mdelay(1); /* device settle delay */
1028 imm_disconnect(dev
);
1029 mdelay(1); /* device settle delay */
1033 static int device_check(imm_struct
*dev
)
1035 /* This routine looks for a device and then attempts to use EPP
1036 to send a command. If all goes as planned then EPP is available. */
1038 static char cmd
[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1039 int loop
, old_mode
, status
, k
, ppb
= dev
->base
;
1042 old_mode
= dev
->mode
;
1043 for (loop
= 0; loop
< 8; loop
++) {
1044 /* Attempt to use EPP for Test Unit Ready */
1045 if ((ppb
& 0x0007) == 0x0000)
1046 dev
->mode
= IMM_EPP_32
;
1049 imm_connect(dev
, CONNECT_EPP_MAYBE
);
1050 /* Select SCSI device */
1051 if (!imm_select(dev
, loop
)) {
1052 imm_disconnect(dev
);
1055 printk("imm: Found device at ID %i, Attempting to use %s\n",
1056 loop
, IMM_MODE_STRING
[dev
->mode
]);
1058 /* Send SCSI command */
1061 for (l
= 0; (l
< 3) && (status
); l
++)
1062 status
= imm_out(dev
, &cmd
[l
<< 1], 2);
1065 imm_disconnect(dev
);
1066 imm_connect(dev
, CONNECT_EPP_MAYBE
);
1067 imm_reset_pulse(dev
->base
);
1069 imm_disconnect(dev
);
1071 if (dev
->mode
== IMM_EPP_32
) {
1072 dev
->mode
= old_mode
;
1075 printk("imm: Unable to establish communication\n");
1080 k
= 1000000; /* 1 Second */
1085 } while (!(l
& 0x80) && (k
));
1090 imm_disconnect(dev
);
1091 imm_connect(dev
, CONNECT_EPP_MAYBE
);
1092 imm_reset_pulse(dev
->base
);
1094 imm_disconnect(dev
);
1096 if (dev
->mode
== IMM_EPP_32
) {
1097 dev
->mode
= old_mode
;
1101 ("imm: Unable to establish communication\n");
1104 imm_disconnect(dev
);
1106 ("imm: Communication established at 0x%x with ID %i using %s\n",
1107 ppb
, loop
, IMM_MODE_STRING
[dev
->mode
]);
1108 imm_connect(dev
, CONNECT_EPP_MAYBE
);
1109 imm_reset_pulse(dev
->base
);
1111 imm_disconnect(dev
);
1115 printk("imm: No devices found\n");
1120 * imm cannot deal with highmem, so this causes all IO pages for this host
1121 * to reside in low memory (hence mapped)
1123 static int imm_adjust_queue(struct scsi_device
*device
)
1125 blk_queue_bounce_limit(device
->request_queue
, BLK_BOUNCE_HIGH
);
1129 static struct scsi_host_template imm_template
= {
1130 .module
= THIS_MODULE
,
1132 .proc_info
= imm_proc_info
,
1133 .name
= "Iomega VPI2 (imm) interface",
1134 .queuecommand
= imm_queuecommand
,
1135 .eh_abort_handler
= imm_abort
,
1136 .eh_bus_reset_handler
= imm_reset
,
1137 .eh_host_reset_handler
= imm_reset
,
1138 .bios_param
= imm_biosparam
,
1140 .sg_tablesize
= SG_ALL
,
1142 .use_clustering
= ENABLE_CLUSTERING
,
1144 .slave_alloc
= imm_adjust_queue
,
1147 /***************************************************************************
1148 * Parallel port probing routines *
1149 ***************************************************************************/
1151 static LIST_HEAD(imm_hosts
);
1153 static int __imm_attach(struct parport
*pb
)
1155 struct Scsi_Host
*host
;
1157 DECLARE_WAIT_QUEUE_HEAD(waiting
);
1163 init_waitqueue_head(&waiting
);
1165 dev
= kmalloc(sizeof(imm_struct
), GFP_KERNEL
);
1169 memset(dev
, 0, sizeof(imm_struct
));
1172 dev
->mode
= IMM_AUTODETECT
;
1173 INIT_LIST_HEAD(&dev
->list
);
1175 dev
->dev
= parport_register_device(pb
, "imm", NULL
, imm_wakeup
,
1182 /* Claim the bus so it remembers what we do to the control
1183 * registers. [ CTR and ECP ]
1186 dev
->waiting
= &waiting
;
1187 prepare_to_wait(&waiting
, &wait
, TASK_UNINTERRUPTIBLE
);
1188 if (imm_pb_claim(dev
))
1189 schedule_timeout(3 * HZ
);
1191 printk(KERN_ERR
"imm%d: failed to claim parport because "
1192 "a pardevice is owning the port for too long "
1193 "time!\n", pb
->number
);
1194 imm_pb_dismiss(dev
);
1195 dev
->waiting
= NULL
;
1196 finish_wait(&waiting
, &wait
);
1199 dev
->waiting
= NULL
;
1200 finish_wait(&waiting
, &wait
);
1201 ppb
= dev
->base
= dev
->dev
->port
->base
;
1202 dev
->base_hi
= dev
->dev
->port
->base_hi
;
1204 modes
= dev
->dev
->port
->modes
;
1206 /* Mode detection works up the chain of speed
1207 * This avoids a nasty if-then-else-if-... tree
1209 dev
->mode
= IMM_NIBBLE
;
1211 if (modes
& PARPORT_MODE_TRISTATE
)
1212 dev
->mode
= IMM_PS2
;
1214 /* Done configuration */
1216 err
= imm_init(dev
);
1218 imm_pb_release(dev
);
1223 /* now the glue ... */
1224 if (dev
->mode
== IMM_NIBBLE
|| dev
->mode
== IMM_PS2
)
1229 INIT_WORK(&dev
->imm_tq
, imm_interrupt
, dev
);
1232 host
= scsi_host_alloc(&imm_template
, sizeof(imm_struct
*));
1235 host
->io_port
= pb
->base
;
1236 host
->n_io_port
= ports
;
1237 host
->dma_channel
= -1;
1238 host
->unique_id
= pb
->number
;
1239 *(imm_struct
**)&host
->hostdata
= dev
;
1241 list_add_tail(&dev
->list
, &imm_hosts
);
1242 err
= scsi_add_host(host
, NULL
);
1245 scsi_scan_host(host
);
1249 list_del_init(&dev
->list
);
1250 scsi_host_put(host
);
1252 parport_unregister_device(dev
->dev
);
1258 static void imm_attach(struct parport
*pb
)
1263 static void imm_detach(struct parport
*pb
)
1266 list_for_each_entry(dev
, &imm_hosts
, list
) {
1267 if (dev
->dev
->port
== pb
) {
1268 list_del_init(&dev
->list
);
1269 scsi_remove_host(dev
->host
);
1270 scsi_host_put(dev
->host
);
1271 parport_unregister_device(dev
->dev
);
1278 static struct parport_driver imm_driver
= {
1280 .attach
= imm_attach
,
1281 .detach
= imm_detach
,
1284 static int __init
imm_driver_init(void)
1286 printk("imm: Version %s\n", IMM_VERSION
);
1287 return parport_register_driver(&imm_driver
);
1290 static void __exit
imm_driver_exit(void)
1292 parport_unregister_driver(&imm_driver
);
1295 module_init(imm_driver_init
);
1296 module_exit(imm_driver_exit
);
1298 MODULE_LICENSE("GPL");