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 unofficial 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/init.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/blkdev.h>
15 #include <linux/parport.h>
16 #include <linux/workqueue.h>
17 #include <linux/delay.h>
18 #include <linux/slab.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 delayed_work 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 unsigned int dev_no; /* Device number */
47 wait_queue_head_t *waiting;
48 struct Scsi_Host *host;
49 struct list_head list;
52 static void imm_reset_pulse(unsigned int base);
53 static int device_check(imm_struct *dev);
57 static inline imm_struct *imm_dev(struct Scsi_Host *host)
59 return *(imm_struct **)&host->hostdata;
62 static DEFINE_SPINLOCK(arbitration_lock);
64 static void got_it(imm_struct *dev)
66 dev->base = dev->dev->port->base;
68 dev->cur_cmd->SCp.phase = 1;
70 wake_up(dev->waiting);
73 static void imm_wakeup(void *ref)
75 imm_struct *dev = (imm_struct *) ref;
78 spin_lock_irqsave(&arbitration_lock, flags);
80 parport_claim(dev->dev);
84 spin_unlock_irqrestore(&arbitration_lock, flags);
87 static int imm_pb_claim(imm_struct *dev)
91 spin_lock_irqsave(&arbitration_lock, flags);
92 if (parport_claim(dev->dev) == 0) {
97 spin_unlock_irqrestore(&arbitration_lock, flags);
101 static void imm_pb_dismiss(imm_struct *dev)
105 spin_lock_irqsave(&arbitration_lock, flags);
106 wanted = dev->wanted;
108 spin_unlock_irqrestore(&arbitration_lock, flags);
110 parport_release(dev->dev);
113 static inline void imm_pb_release(imm_struct *dev)
115 parport_release(dev->dev);
118 /* This is to give the imm driver a way to modify the timings (and other
119 * parameters) by writing to the /proc/scsi/imm/0 file.
120 * Very simple method really... (Too simple, no error checking :( )
121 * Reason: Kernel hackers HATE having to unload and reload modules for
123 * Also gives a method to use a script to obtain optimum timings (TODO)
125 static int imm_write_info(struct Scsi_Host *host, char *buffer, int length)
127 imm_struct *dev = imm_dev(host);
129 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
130 dev->mode = simple_strtoul(buffer + 5, NULL, 0);
133 printk("imm /proc: invalid variable\n");
137 static int imm_show_info(struct seq_file *m, struct Scsi_Host *host)
139 imm_struct *dev = imm_dev(host);
141 seq_printf(m, "Version : %s\n", IMM_VERSION);
142 seq_printf(m, "Parport : %s\n", dev->dev->port->name);
143 seq_printf(m, "Mode : %s\n", IMM_MODE_STRING[dev->mode]);
148 #define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\
149 y, __func__, __LINE__); imm_fail_func(x,y);
151 imm_fail_func(imm_struct *dev, int error_code)
154 imm_fail(imm_struct *dev, int error_code)
157 /* If we fail a device then we trash status / message bytes */
159 dev->cur_cmd->result = error_code << 16;
165 * Wait for the high bit to be set.
167 * In principle, this could be tied to an interrupt, but the adapter
168 * doesn't appear to be designed to support interrupts. We spin on
169 * the 0x80 ready bit.
171 static unsigned char imm_wait(imm_struct *dev)
174 unsigned short ppb = dev->base;
185 while (!(r & 0x80) && (k));
188 * STR register (LPT base+1) to SCSI mapping:
191 * ===================================
199 * ==================================
201 * 0xc0 0x88 ZIP wants more data
202 * 0xd0 0x98 ZIP wants to send more data
203 * 0xe0 0xa8 ZIP is expecting SCSI command data
204 * 0xf0 0xb8 end of transfer, ZIP is sending status
210 /* Counter expired - Time out occurred */
211 imm_fail(dev, DID_TIME_OUT);
212 printk("imm timeout in imm_wait\n");
213 return 0; /* command timed out */
216 static int imm_negotiate(imm_struct * tmp)
219 * The following is supposedly the IEEE 1284-1994 negotiate
220 * sequence. I have yet to obtain a copy of the above standard
221 * so this is a bit of a guess...
223 * A fair chunk of this is based on the Linux parport implementation
226 * Return 0 if data available
227 * 1 if no data available
230 unsigned short base = tmp->base;
231 unsigned char a, mode;
250 a = (r_str(base) & 0x20) ? 0 : 1;
258 ("IMM: IEEE1284 negotiate indicates no data available.\n");
259 imm_fail(tmp, DID_ERROR);
265 * Clear EPP timeout bit.
267 static inline void epp_reset(unsigned short ppb)
273 w_str(ppb, i & 0xfe);
277 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
279 static inline void ecp_sync(imm_struct *dev)
281 int i, ppb_hi = dev->base_hi;
286 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
287 for (i = 0; i < 100; i++) {
288 if (r_ecr(ppb_hi) & 0x01)
292 printk("imm: ECP sync failed as data still present in FIFO.\n");
296 static int imm_byte_out(unsigned short base, const char *buffer, int len)
300 w_ctr(base, 0x4); /* apparently a sane mode */
301 for (i = len >> 1; i; i--) {
302 w_dtr(base, *buffer++);
303 w_ctr(base, 0x5); /* Drop STROBE low */
304 w_dtr(base, *buffer++);
305 w_ctr(base, 0x0); /* STROBE high + INIT low */
307 w_ctr(base, 0x4); /* apparently a sane mode */
308 return 1; /* All went well - we hope! */
311 static int imm_nibble_in(unsigned short base, char *buffer, int len)
317 * The following is based on documented timing signals
320 for (i = len; i; i--) {
322 l = (r_str(base) & 0xf0) >> 4;
324 *buffer++ = (r_str(base) & 0xf0) | l;
327 return 1; /* All went well - we hope! */
330 static int imm_byte_in(unsigned short base, char *buffer, int len)
335 * The following is based on documented timing signals
338 for (i = len; i; i--) {
340 *buffer++ = r_dtr(base);
343 return 1; /* All went well - we hope! */
346 static int imm_out(imm_struct *dev, char *buffer, int len)
348 unsigned short ppb = dev->base;
349 int r = imm_wait(dev);
353 * a) the SCSI bus is BUSY (device still listening)
354 * b) the device is listening
356 if ((r & 0x18) != 0x08) {
357 imm_fail(dev, DID_ERROR);
358 printk("IMM: returned SCSI status %2x\n", r);
367 #ifdef CONFIG_SCSI_IZIP_EPP16
368 if (!(((long) buffer | len) & 0x01))
369 outsw(ppb + 4, buffer, len >> 1);
371 if (!(((long) buffer | len) & 0x03))
372 outsl(ppb + 4, buffer, len >> 2);
375 outsb(ppb + 4, buffer, len);
377 r = !(r_str(ppb) & 0x01);
384 /* 8 bit output, with a loop */
385 r = imm_byte_out(ppb, buffer, len);
389 printk("IMM: bug in imm_out()\n");
395 static int imm_in(imm_struct *dev, char *buffer, int len)
397 unsigned short ppb = dev->base;
398 int r = imm_wait(dev);
402 * a) the SCSI bus is BUSY (device still listening)
403 * b) the device is sending data
405 if ((r & 0x18) != 0x18) {
406 imm_fail(dev, DID_ERROR);
411 /* 4 bit input, with a loop */
412 r = imm_nibble_in(ppb, buffer, len);
417 /* 8 bit input, with a loop */
418 r = imm_byte_in(ppb, buffer, len);
427 #ifdef CONFIG_SCSI_IZIP_EPP16
428 if (!(((long) buffer | len) & 0x01))
429 insw(ppb + 4, buffer, len >> 1);
431 if (!(((long) buffer | len) & 0x03))
432 insl(ppb + 4, buffer, len >> 2);
435 insb(ppb + 4, buffer, len);
437 r = !(r_str(ppb) & 0x01);
443 printk("IMM: bug in imm_ins()\n");
450 static int imm_cpp(unsigned short ppb, unsigned char b)
453 * Comments on udelay values refer to the
454 * Command Packet Protocol (CPP) timing diagram.
457 unsigned char s1, s2, s3;
459 udelay(2); /* 1 usec - infinite */
461 udelay(10); /* 7 usec - infinite */
463 udelay(10); /* 7 usec - infinite */
465 udelay(10); /* 7 usec - infinite */
467 udelay(10); /* 7 usec - infinite */
468 s1 = r_str(ppb) & 0xb8;
470 udelay(10); /* 7 usec - infinite */
471 s2 = r_str(ppb) & 0xb8;
473 udelay(10); /* 7 usec - infinite */
474 s3 = r_str(ppb) & 0x38;
477 * 0000 00aa Assign address aa to current device
478 * 0010 00aa Select device aa in EPP Winbond mode
479 * 0010 10aa Select device aa in EPP mode
480 * 0011 xxxx Deselect all devices
481 * 0110 00aa Test device aa
482 * 1101 00aa Select device aa in ECP mode
483 * 1110 00aa Select device aa in Compatible mode
486 udelay(2); /* 1 usec - infinite */
488 udelay(10); /* 7 usec - infinite */
490 udelay(2); /* 1 usec - infinite */
492 udelay(10); /* 7 usec - infinite */
494 udelay(10); /* 7 usec - infinite */
497 * The following table is electrical pin values.
498 * (BSY is inverted at the CTR register)
500 * BSY ACK POut SEL Fault
505 * L => Last device in chain
508 * Observered values for S1,S2,S3 are:
509 * Disconnect => f8/58/78
510 * Connect => f8/58/70
512 if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x30))
513 return 1; /* Connected */
514 if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x38))
515 return 0; /* Disconnected */
517 return -1; /* No device present */
520 static inline int imm_connect(imm_struct *dev, int flag)
522 unsigned short ppb = dev->base;
524 imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
525 imm_cpp(ppb, 0x30); /* Disconnect all devices */
527 if ((dev->mode == IMM_EPP_8) ||
528 (dev->mode == IMM_EPP_16) ||
529 (dev->mode == IMM_EPP_32))
530 return imm_cpp(ppb, 0x28); /* Select device 0 in EPP mode */
531 return imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
534 static void imm_disconnect(imm_struct *dev)
536 imm_cpp(dev->base, 0x30); /* Disconnect all devices */
539 static int imm_select(imm_struct *dev, int target)
542 unsigned short ppb = dev->base;
545 * Firstly we want to make sure there is nothing
546 * holding onto the SCSI bus.
553 } while ((r_str(ppb) & 0x08) && (k));
559 * Now assert the SCSI ID (HOST and TARGET) on the data bus
562 w_dtr(ppb, 0x80 | (1 << target));
566 * Deassert SELIN first followed by STROBE
572 * ACK should drop low while SELIN is deasserted.
573 * FAULT should drop low when the SCSI device latches the bus.
579 while (!(r_str(ppb) & 0x08) && (k));
582 * Place the interface back into a sane state (status mode)
588 static int imm_init(imm_struct *dev)
590 if (imm_connect(dev, 0) != 1)
592 imm_reset_pulse(dev->base);
593 mdelay(1); /* Delay to allow devices to settle */
595 mdelay(1); /* Another delay to allow devices to settle */
596 return device_check(dev);
599 static inline int imm_send_command(struct scsi_cmnd *cmd)
601 imm_struct *dev = imm_dev(cmd->device->host);
604 /* NOTE: IMM uses byte pairs */
605 for (k = 0; k < cmd->cmd_len; k += 2)
606 if (!imm_out(dev, &cmd->cmnd[k], 2))
612 * The bulk flag enables some optimisations in the data transfer loops,
613 * it should be true for any command that transfers data in integral
614 * numbers of sectors.
616 * The driver appears to remain stable if we speed up the parallel port
617 * i/o in this function, but not elsewhere.
619 static int imm_completion(struct scsi_cmnd *cmd)
624 * 1 Finished data transfer
626 imm_struct *dev = imm_dev(cmd->device->host);
627 unsigned short ppb = dev->base;
628 unsigned long start_jiffies = jiffies;
631 int fast, bulk, status;
634 bulk = ((v == READ_6) ||
635 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
638 * We only get here if the drive is ready to comunicate,
639 * hence no need for a full imm_wait.
642 r = (r_str(ppb) & 0xb8);
645 * while (device is not ready to send status byte)
648 while (r != (unsigned char) 0xb8) {
650 * If we have been running for more than a full timer tick
653 if (time_after(jiffies, start_jiffies + 1))
658 * a) Drive status is screwy (!ready && !present)
659 * b) Drive is requesting/sending more data than expected
661 if (((r & 0x88) != 0x88) || (cmd->SCp.this_residual <= 0)) {
662 imm_fail(dev, DID_ERROR);
663 return -1; /* ERROR_RETURN */
665 /* determine if we should use burst I/O */
668 && (cmd->SCp.this_residual >=
669 IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 2;
670 status = imm_out(dev, cmd->SCp.ptr, fast);
673 && (cmd->SCp.this_residual >=
674 IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 1;
675 status = imm_in(dev, cmd->SCp.ptr, fast);
678 cmd->SCp.ptr += fast;
679 cmd->SCp.this_residual -= fast;
682 imm_fail(dev, DID_BUS_BUSY);
683 return -1; /* ERROR_RETURN */
685 if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
686 /* if scatter/gather, advance to the next segment */
687 if (cmd->SCp.buffers_residual--) {
689 cmd->SCp.this_residual =
690 cmd->SCp.buffer->length;
691 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
694 * Make sure that we transfer even number of bytes
695 * otherwise it makes imm_byte_out() messy.
697 if (cmd->SCp.this_residual & 0x01)
698 cmd->SCp.this_residual++;
701 /* Now check to see if the drive is ready to comunicate */
703 r = (r_str(ppb) & 0xb8);
705 /* If not, drop back down to the scheduler and wait a timer tick */
709 return 1; /* FINISH_RETURN */
713 * Since the IMM itself doesn't generate interrupts, we use
714 * the scheduler's task queue to generate a stream of call-backs and
715 * complete the request when the drive is ready.
717 static void imm_interrupt(struct work_struct *work)
719 imm_struct *dev = container_of(work, imm_struct, imm_tq.work);
720 struct scsi_cmnd *cmd = dev->cur_cmd;
721 struct Scsi_Host *host = cmd->device->host;
724 if (imm_engine(dev, cmd)) {
725 schedule_delayed_work(&dev->imm_tq, 1);
728 /* Command must of completed hence it is safe to let go... */
730 switch ((cmd->result >> 16) & 0xff) {
734 printk("imm: no device at SCSI ID %i\n", cmd->device->id);
737 printk("imm: BUS BUSY - EPP timeout detected\n");
740 printk("imm: unknown timeout\n");
743 printk("imm: told to abort\n");
746 printk("imm: parity error (???)\n");
749 printk("imm: internal driver error\n");
752 printk("imm: told to reset device\n");
755 printk("imm: bad interrupt (???)\n");
758 printk("imm: bad return code (%02x)\n",
759 (cmd->result >> 16) & 0xff);
763 if (cmd->SCp.phase > 1)
768 spin_lock_irqsave(host->host_lock, flags);
771 spin_unlock_irqrestore(host->host_lock, flags);
775 static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd)
777 unsigned short ppb = dev->base;
778 unsigned char l = 0, h = 0;
781 /* First check for any errors that may have occurred
782 * Here we check for internal errors
787 switch (cmd->SCp.phase) {
788 case 0: /* Phase 0 - Waiting for parport */
789 if (time_after(jiffies, dev->jstart + HZ)) {
791 * We waited more than a second
792 * for parport to call us
794 imm_fail(dev, DID_BUS_BUSY);
797 return 1; /* wait until imm_wakeup claims parport */
798 /* Phase 1 - Connected */
800 imm_connect(dev, CONNECT_EPP_MAYBE);
803 /* Phase 2 - We are now talking to the scsi bus */
805 if (!imm_select(dev, scmd_id(cmd))) {
806 imm_fail(dev, DID_NO_CONNECT);
811 /* Phase 3 - Ready to accept a command */
814 if (!(r_str(ppb) & 0x80))
817 if (!imm_send_command(cmd))
821 /* Phase 4 - Setup scatter/gather buffers */
823 if (scsi_bufflen(cmd)) {
824 cmd->SCp.buffer = scsi_sglist(cmd);
825 cmd->SCp.this_residual = cmd->SCp.buffer->length;
826 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
828 cmd->SCp.buffer = NULL;
829 cmd->SCp.this_residual = 0;
832 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
834 if (cmd->SCp.this_residual & 0x01)
835 cmd->SCp.this_residual++;
836 /* Phase 5 - Pre-Data transfer stage */
838 /* Spin lock for BUSY */
840 if (!(r_str(ppb) & 0x80))
843 /* Require negotiation for read requests */
844 x = (r_str(ppb) & 0xb8);
845 dev->rd = (x & 0x10) ? 1 : 0;
846 dev->dp = (x & 0x20) ? 0 : 1;
848 if ((dev->dp) && (dev->rd))
849 if (imm_negotiate(dev))
853 /* Phase 6 - Data transfer stage */
855 /* Spin lock for BUSY */
857 if (!(r_str(ppb) & 0x80))
861 retv = imm_completion(cmd);
869 /* Phase 7 - Post data transfer stage */
871 if ((dev->dp) && (dev->rd)) {
872 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) {
881 /* Phase 8 - Read status/message */
883 /* Check for data overrun */
884 if (imm_wait(dev) != (unsigned char) 0xb8) {
885 imm_fail(dev, DID_ERROR);
888 if (imm_negotiate(dev))
890 if (imm_in(dev, &l, 1)) { /* read status byte */
891 /* Check for optional message byte */
892 if (imm_wait(dev) == (unsigned char) 0xb8)
894 cmd->result = (DID_OK << 16) + (l & STATUS_MASK);
896 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) {
902 return 0; /* Finished */
906 printk("imm: Invalid scsi phase\n");
911 static int imm_queuecommand_lck(struct scsi_cmnd *cmd,
912 void (*done)(struct scsi_cmnd *))
914 imm_struct *dev = imm_dev(cmd->device->host);
917 printk("IMM: bug in imm_queuecommand\n");
921 dev->jstart = jiffies;
923 cmd->scsi_done = done;
924 cmd->result = DID_ERROR << 16; /* default return code */
925 cmd->SCp.phase = 0; /* bus free */
927 schedule_delayed_work(&dev->imm_tq, 0);
934 static DEF_SCSI_QCMD(imm_queuecommand)
937 * Apparently the disk->capacity attribute is off by 1 sector
938 * for all disk drives. We add the one here, but it should really
939 * be done in sd.c. Even if it gets fixed there, this will still
942 static int imm_biosparam(struct scsi_device *sdev, struct block_device *dev,
943 sector_t capacity, int ip[])
947 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
951 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
956 static int imm_abort(struct scsi_cmnd *cmd)
958 imm_struct *dev = imm_dev(cmd->device->host);
960 * There is no method for aborting commands since Iomega
961 * have tied the SCSI_MESSAGE line high in the interface
964 switch (cmd->SCp.phase) {
965 case 0: /* Do not have access to parport */
966 case 1: /* Have not connected to interface */
967 dev->cur_cmd = NULL; /* Forget the problem */
970 default: /* SCSI command sent, can not abort */
976 static void imm_reset_pulse(unsigned int base)
988 static int imm_reset(struct scsi_cmnd *cmd)
990 imm_struct *dev = imm_dev(cmd->device->host);
994 dev->cur_cmd = NULL; /* Forget the problem */
996 imm_connect(dev, CONNECT_NORMAL);
997 imm_reset_pulse(dev->base);
998 mdelay(1); /* device settle delay */
1000 mdelay(1); /* device settle delay */
1004 static int device_check(imm_struct *dev)
1006 /* This routine looks for a device and then attempts to use EPP
1007 to send a command. If all goes as planned then EPP is available. */
1009 static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1010 int loop, old_mode, status, k, ppb = dev->base;
1013 old_mode = dev->mode;
1014 for (loop = 0; loop < 8; loop++) {
1015 /* Attempt to use EPP for Test Unit Ready */
1016 if ((ppb & 0x0007) == 0x0000)
1017 dev->mode = IMM_EPP_32;
1020 imm_connect(dev, CONNECT_EPP_MAYBE);
1021 /* Select SCSI device */
1022 if (!imm_select(dev, loop)) {
1023 imm_disconnect(dev);
1026 printk("imm: Found device at ID %i, Attempting to use %s\n",
1027 loop, IMM_MODE_STRING[dev->mode]);
1029 /* Send SCSI command */
1032 for (l = 0; (l < 3) && (status); l++)
1033 status = imm_out(dev, &cmd[l << 1], 2);
1036 imm_disconnect(dev);
1037 imm_connect(dev, CONNECT_EPP_MAYBE);
1038 imm_reset_pulse(dev->base);
1040 imm_disconnect(dev);
1042 if (dev->mode == IMM_EPP_32) {
1043 dev->mode = old_mode;
1046 printk("imm: Unable to establish communication\n");
1051 k = 1000000; /* 1 Second */
1056 } while (!(l & 0x80) && (k));
1061 imm_disconnect(dev);
1062 imm_connect(dev, CONNECT_EPP_MAYBE);
1063 imm_reset_pulse(dev->base);
1065 imm_disconnect(dev);
1067 if (dev->mode == IMM_EPP_32) {
1068 dev->mode = old_mode;
1072 ("imm: Unable to establish communication\n");
1075 imm_disconnect(dev);
1077 ("imm: Communication established at 0x%x with ID %i using %s\n",
1078 ppb, loop, IMM_MODE_STRING[dev->mode]);
1079 imm_connect(dev, CONNECT_EPP_MAYBE);
1080 imm_reset_pulse(dev->base);
1082 imm_disconnect(dev);
1086 printk("imm: No devices found\n");
1091 * imm cannot deal with highmem, so this causes all IO pages for this host
1092 * to reside in low memory (hence mapped)
1094 static int imm_adjust_queue(struct scsi_device *device)
1096 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
1100 static struct scsi_host_template imm_template = {
1101 .module = THIS_MODULE,
1103 .show_info = imm_show_info,
1104 .write_info = imm_write_info,
1105 .name = "Iomega VPI2 (imm) interface",
1106 .queuecommand = imm_queuecommand,
1107 .eh_abort_handler = imm_abort,
1108 .eh_bus_reset_handler = imm_reset,
1109 .eh_host_reset_handler = imm_reset,
1110 .bios_param = imm_biosparam,
1112 .sg_tablesize = SG_ALL,
1113 .use_clustering = ENABLE_CLUSTERING,
1115 .slave_alloc = imm_adjust_queue,
1118 /***************************************************************************
1119 * Parallel port probing routines *
1120 ***************************************************************************/
1122 static LIST_HEAD(imm_hosts);
1125 * Finds the first available device number that can be alloted to the
1126 * new imm device and returns the address of the previous node so that
1127 * we can add to the tail and have a list in the ascending order.
1130 static inline imm_struct *find_parent(void)
1132 imm_struct *dev, *par = NULL;
1133 unsigned int cnt = 0;
1135 if (list_empty(&imm_hosts))
1138 list_for_each_entry(dev, &imm_hosts, list) {
1139 if (dev->dev_no != cnt)
1148 static int __imm_attach(struct parport *pb)
1150 struct Scsi_Host *host;
1151 imm_struct *dev, *temp;
1152 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
1157 struct pardev_cb imm_cb;
1159 init_waitqueue_head(&waiting);
1161 dev = kzalloc(sizeof(imm_struct), GFP_KERNEL);
1167 dev->mode = IMM_AUTODETECT;
1168 INIT_LIST_HEAD(&dev->list);
1170 temp = find_parent();
1172 dev->dev_no = temp->dev_no + 1;
1174 memset(&imm_cb, 0, sizeof(imm_cb));
1175 imm_cb.private = dev;
1176 imm_cb.wakeup = imm_wakeup;
1178 dev->dev = parport_register_dev_model(pb, "imm", &imm_cb, dev->dev_no);
1183 /* Claim the bus so it remembers what we do to the control
1184 * registers. [ CTR and ECP ]
1187 dev->waiting = &waiting;
1188 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1189 if (imm_pb_claim(dev))
1190 schedule_timeout(3 * HZ);
1192 printk(KERN_ERR "imm%d: failed to claim parport because "
1193 "a pardevice is owning the port for too long "
1194 "time!\n", pb->number);
1195 imm_pb_dismiss(dev);
1196 dev->waiting = NULL;
1197 finish_wait(&waiting, &wait);
1200 dev->waiting = NULL;
1201 finish_wait(&waiting, &wait);
1202 ppb = dev->base = dev->dev->port->base;
1203 dev->base_hi = dev->dev->port->base_hi;
1205 modes = dev->dev->port->modes;
1207 /* Mode detection works up the chain of speed
1208 * This avoids a nasty if-then-else-if-... tree
1210 dev->mode = IMM_NIBBLE;
1212 if (modes & PARPORT_MODE_TRISTATE)
1213 dev->mode = IMM_PS2;
1215 /* Done configuration */
1217 err = imm_init(dev);
1219 imm_pb_release(dev);
1224 /* now the glue ... */
1225 if (dev->mode == IMM_NIBBLE || dev->mode == IMM_PS2)
1230 INIT_DELAYED_WORK(&dev->imm_tq, imm_interrupt);
1233 host = scsi_host_alloc(&imm_template, sizeof(imm_struct *));
1236 host->io_port = pb->base;
1237 host->n_io_port = ports;
1238 host->dma_channel = -1;
1239 host->unique_id = pb->number;
1240 *(imm_struct **)&host->hostdata = dev;
1243 list_add_tail(&dev->list, &imm_hosts);
1245 list_add_tail(&dev->list, &temp->list);
1246 err = scsi_add_host(host, NULL);
1249 scsi_scan_host(host);
1253 list_del_init(&dev->list);
1254 scsi_host_put(host);
1256 parport_unregister_device(dev->dev);
1262 static void imm_attach(struct parport *pb)
1267 static void imm_detach(struct parport *pb)
1270 list_for_each_entry(dev, &imm_hosts, list) {
1271 if (dev->dev->port == pb) {
1272 list_del_init(&dev->list);
1273 scsi_remove_host(dev->host);
1274 scsi_host_put(dev->host);
1275 parport_unregister_device(dev->dev);
1282 static struct parport_driver imm_driver = {
1284 .match_port = imm_attach,
1285 .detach = imm_detach,
1289 static int __init imm_driver_init(void)
1291 printk("imm: Version %s\n", IMM_VERSION);
1292 return parport_register_driver(&imm_driver);
1295 static void __exit imm_driver_exit(void)
1297 parport_unregister_driver(&imm_driver);
1300 module_init(imm_driver_init);
1301 module_exit(imm_driver_exit);
1303 MODULE_LICENSE("GPL");