1 // SPDX-License-Identifier: GPL-2.0-only
2 /* imm.c -- low level driver for the IOMEGA MatchMaker
3 * parallel port SCSI host adapter.
5 * (The IMM is the embedded controller in the ZIP Plus drive.)
7 * My unofficial company acronym list is 21 pages long:
8 * FLA: Four letter acronym with built in facility for
9 * future expansion to five letters.
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>
19 #include <linux/slab.h>
22 #include <scsi/scsi.h>
23 #include <scsi/scsi_cmnd.h>
24 #include <scsi/scsi_device.h>
25 #include <scsi/scsi_host.h>
27 /* The following #define is to avoid a clash with hosts.c */
28 #define IMM_PROBE_SPP 0x0001
29 #define IMM_PROBE_PS2 0x0002
30 #define IMM_PROBE_ECR 0x0010
31 #define IMM_PROBE_EPP17 0x0100
32 #define IMM_PROBE_EPP19 0x0200
36 struct pardevice *dev; /* Parport device entry */
37 int base; /* Actual port address */
38 int base_hi; /* Hi Base address for ECP-ISA chipset */
39 int mode; /* Transfer mode */
40 struct scsi_cmnd *cur_cmd; /* Current queued command */
41 struct delayed_work imm_tq; /* Polling interrupt stuff */
42 unsigned long jstart; /* Jiffies at start */
43 unsigned failed:1; /* Failure flag */
44 unsigned dp:1; /* Data phase present */
45 unsigned rd:1; /* Read data in data phase */
46 unsigned wanted:1; /* Parport sharing busy flag */
47 unsigned int dev_no; /* Device number */
48 wait_queue_head_t *waiting;
49 struct Scsi_Host *host;
50 struct list_head list;
53 static void imm_reset_pulse(unsigned int base);
54 static int device_check(imm_struct *dev, bool autodetect);
58 static unsigned int mode = IMM_AUTODETECT;
59 module_param(mode, uint, 0644);
60 MODULE_PARM_DESC(mode, "Transfer mode (0 = Autodetect, 1 = SPP 4-bit, "
61 "2 = SPP 8-bit, 3 = EPP 8-bit, 4 = EPP 16-bit, 5 = EPP 32-bit");
63 static inline imm_struct *imm_dev(struct Scsi_Host *host)
65 return *(imm_struct **)&host->hostdata;
68 static DEFINE_SPINLOCK(arbitration_lock);
70 static void got_it(imm_struct *dev)
72 dev->base = dev->dev->port->base;
74 imm_scsi_pointer(dev->cur_cmd)->phase = 1;
76 wake_up(dev->waiting);
79 static void imm_wakeup(void *ref)
81 imm_struct *dev = (imm_struct *) ref;
84 spin_lock_irqsave(&arbitration_lock, flags);
86 if (parport_claim(dev->dev) == 0) {
91 spin_unlock_irqrestore(&arbitration_lock, flags);
94 static int imm_pb_claim(imm_struct *dev)
98 spin_lock_irqsave(&arbitration_lock, flags);
99 if (parport_claim(dev->dev) == 0) {
104 spin_unlock_irqrestore(&arbitration_lock, flags);
108 static void imm_pb_dismiss(imm_struct *dev)
112 spin_lock_irqsave(&arbitration_lock, flags);
113 wanted = dev->wanted;
115 spin_unlock_irqrestore(&arbitration_lock, flags);
117 parport_release(dev->dev);
120 static inline void imm_pb_release(imm_struct *dev)
122 parport_release(dev->dev);
125 /* This is to give the imm driver a way to modify the timings (and other
126 * parameters) by writing to the /proc/scsi/imm/0 file.
127 * Very simple method really... (Too simple, no error checking :( )
128 * Reason: Kernel hackers HATE having to unload and reload modules for
130 * Also gives a method to use a script to obtain optimum timings (TODO)
132 static int imm_write_info(struct Scsi_Host *host, char *buffer, int length)
134 imm_struct *dev = imm_dev(host);
136 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
137 dev->mode = simple_strtoul(buffer + 5, NULL, 0);
140 printk("imm /proc: invalid variable\n");
144 static int imm_show_info(struct seq_file *m, struct Scsi_Host *host)
146 imm_struct *dev = imm_dev(host);
148 seq_printf(m, "Version : %s\n", IMM_VERSION);
149 seq_printf(m, "Parport : %s\n", dev->dev->port->name);
150 seq_printf(m, "Mode : %s\n", IMM_MODE_STRING[dev->mode]);
155 #define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\
156 y, __func__, __LINE__); imm_fail_func(x,y);
158 imm_fail_func(imm_struct *dev, int error_code)
161 imm_fail(imm_struct *dev, int error_code)
164 /* If we fail a device then we trash status / message bytes */
166 dev->cur_cmd->result = error_code << 16;
172 * Wait for the high bit to be set.
174 * In principle, this could be tied to an interrupt, but the adapter
175 * doesn't appear to be designed to support interrupts. We spin on
176 * the 0x80 ready bit.
178 static unsigned char imm_wait(imm_struct *dev)
181 unsigned short ppb = dev->base;
192 while (!(r & 0x80) && (k));
195 * STR register (LPT base+1) to SCSI mapping:
198 * ===================================
206 * ==================================
208 * 0xc0 0x88 ZIP wants more data
209 * 0xd0 0x98 ZIP wants to send more data
210 * 0xe0 0xa8 ZIP is expecting SCSI command data
211 * 0xf0 0xb8 end of transfer, ZIP is sending status
217 /* Counter expired - Time out occurred */
218 imm_fail(dev, DID_TIME_OUT);
219 printk("imm timeout in imm_wait\n");
220 return 0; /* command timed out */
223 static int imm_negotiate(imm_struct * tmp)
226 * The following is supposedly the IEEE 1284-1994 negotiate
227 * sequence. I have yet to obtain a copy of the above standard
228 * so this is a bit of a guess...
230 * A fair chunk of this is based on the Linux parport implementation
233 * Return 0 if data available
234 * 1 if no data available
237 unsigned short base = tmp->base;
238 unsigned char a, mode;
257 a = (r_str(base) & 0x20) ? 0 : 1;
265 ("IMM: IEEE1284 negotiate indicates no data available.\n");
266 imm_fail(tmp, DID_ERROR);
272 * Clear EPP timeout bit.
274 static inline void epp_reset(unsigned short ppb)
280 w_str(ppb, i & 0xfe);
284 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
286 static inline void ecp_sync(imm_struct *dev)
288 int i, ppb_hi = dev->base_hi;
293 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
294 for (i = 0; i < 100; i++) {
295 if (r_ecr(ppb_hi) & 0x01)
299 printk("imm: ECP sync failed as data still present in FIFO.\n");
303 static int imm_byte_out(unsigned short base, const char *buffer, int len)
307 w_ctr(base, 0x4); /* apparently a sane mode */
308 for (i = len >> 1; i; i--) {
309 w_dtr(base, *buffer++);
310 w_ctr(base, 0x5); /* Drop STROBE low */
311 w_dtr(base, *buffer++);
312 w_ctr(base, 0x0); /* STROBE high + INIT low */
314 w_ctr(base, 0x4); /* apparently a sane mode */
315 return 1; /* All went well - we hope! */
318 static int imm_nibble_in(unsigned short base, char *buffer, int len)
324 * The following is based on documented timing signals
327 for (i = len; i; i--) {
329 l = (r_str(base) & 0xf0) >> 4;
331 *buffer++ = (r_str(base) & 0xf0) | l;
334 return 1; /* All went well - we hope! */
337 static int imm_byte_in(unsigned short base, char *buffer, int len)
342 * The following is based on documented timing signals
345 for (i = len; i; i--) {
347 *buffer++ = r_dtr(base);
350 return 1; /* All went well - we hope! */
353 static int imm_out(imm_struct *dev, char *buffer, int len)
355 unsigned short ppb = dev->base;
356 int r = imm_wait(dev);
360 * a) the SCSI bus is BUSY (device still listening)
361 * b) the device is listening
363 if ((r & 0x18) != 0x08) {
364 imm_fail(dev, DID_ERROR);
365 printk("IMM: returned SCSI status %2x\n", r);
374 if (dev->mode == IMM_EPP_32 && !(((long) buffer | len) & 0x03))
375 outsl(ppb + 4, buffer, len >> 2);
376 else if (dev->mode == IMM_EPP_16 && !(((long) buffer | len) & 0x01))
377 outsw(ppb + 4, buffer, len >> 1);
379 outsb(ppb + 4, buffer, len);
381 r = !(r_str(ppb) & 0x01);
388 /* 8 bit output, with a loop */
389 r = imm_byte_out(ppb, buffer, len);
393 printk("IMM: bug in imm_out()\n");
399 static int imm_in(imm_struct *dev, char *buffer, int len)
401 unsigned short ppb = dev->base;
402 int r = imm_wait(dev);
406 * a) the SCSI bus is BUSY (device still listening)
407 * b) the device is sending data
409 if ((r & 0x18) != 0x18) {
410 imm_fail(dev, DID_ERROR);
415 /* 4 bit input, with a loop */
416 r = imm_nibble_in(ppb, buffer, len);
421 /* 8 bit input, with a loop */
422 r = imm_byte_in(ppb, buffer, len);
431 if (dev->mode == IMM_EPP_32 && !(((long) buffer | len) & 0x03))
432 insw(ppb + 4, buffer, len >> 2);
433 else if (dev->mode == IMM_EPP_16 && !(((long) buffer | len) & 0x01))
434 insl(ppb + 4, buffer, len >> 1);
436 insb(ppb + 4, buffer, len);
438 r = !(r_str(ppb) & 0x01);
444 printk("IMM: bug in imm_ins()\n");
451 static int imm_cpp(unsigned short ppb, unsigned char b)
454 * Comments on udelay values refer to the
455 * Command Packet Protocol (CPP) timing diagram.
458 unsigned char s1, s2, s3;
460 udelay(2); /* 1 usec - infinite */
462 udelay(10); /* 7 usec - infinite */
464 udelay(10); /* 7 usec - infinite */
466 udelay(10); /* 7 usec - infinite */
468 udelay(10); /* 7 usec - infinite */
469 s1 = r_str(ppb) & 0xb8;
471 udelay(10); /* 7 usec - infinite */
472 s2 = r_str(ppb) & 0xb8;
474 udelay(10); /* 7 usec - infinite */
475 s3 = r_str(ppb) & 0x38;
478 * 0000 00aa Assign address aa to current device
479 * 0010 00aa Select device aa in EPP Winbond mode
480 * 0010 10aa Select device aa in EPP mode
481 * 0011 xxxx Deselect all devices
482 * 0110 00aa Test device aa
483 * 1101 00aa Select device aa in ECP mode
484 * 1110 00aa Select device aa in Compatible mode
487 udelay(2); /* 1 usec - infinite */
489 udelay(10); /* 7 usec - infinite */
491 udelay(2); /* 1 usec - infinite */
493 udelay(10); /* 7 usec - infinite */
495 udelay(10); /* 7 usec - infinite */
498 * The following table is electrical pin values.
499 * (BSY is inverted at the CTR register)
501 * BSY ACK POut SEL Fault
506 * L => Last device in chain
509 * Observered values for S1,S2,S3 are:
510 * Disconnect => f8/58/78
511 * Connect => f8/58/70
513 if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x30))
514 return 1; /* Connected */
515 if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x38))
516 return 0; /* Disconnected */
518 return -1; /* No device present */
521 static inline int imm_connect(imm_struct *dev, int flag)
523 unsigned short ppb = dev->base;
525 imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
526 imm_cpp(ppb, 0x30); /* Disconnect all devices */
528 if ((dev->mode == IMM_EPP_8) ||
529 (dev->mode == IMM_EPP_16) ||
530 (dev->mode == IMM_EPP_32))
531 return imm_cpp(ppb, 0x28); /* Select device 0 in EPP mode */
532 return imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
535 static void imm_disconnect(imm_struct *dev)
537 imm_cpp(dev->base, 0x30); /* Disconnect all devices */
540 static int imm_select(imm_struct *dev, int target)
543 unsigned short ppb = dev->base;
546 * Firstly we want to make sure there is nothing
547 * holding onto the SCSI bus.
554 } while ((r_str(ppb) & 0x08) && (k));
560 * Now assert the SCSI ID (HOST and TARGET) on the data bus
563 w_dtr(ppb, 0x80 | (1 << target));
567 * Deassert SELIN first followed by STROBE
573 * ACK should drop low while SELIN is deasserted.
574 * FAULT should drop low when the SCSI device latches the bus.
580 while (!(r_str(ppb) & 0x08) && (k));
583 * Place the interface back into a sane state (status mode)
589 static int imm_init(imm_struct *dev)
591 bool autodetect = dev->mode == IMM_AUTODETECT;
594 int modes = dev->dev->port->modes;
596 /* Mode detection works up the chain of speed
597 * This avoids a nasty if-then-else-if-... tree
599 dev->mode = IMM_NIBBLE;
601 if (modes & PARPORT_MODE_TRISTATE)
605 if (imm_connect(dev, 0) != 1)
607 imm_reset_pulse(dev->base);
608 mdelay(1); /* Delay to allow devices to settle */
610 mdelay(1); /* Another delay to allow devices to settle */
612 return device_check(dev, autodetect);
615 static inline int imm_send_command(struct scsi_cmnd *cmd)
617 imm_struct *dev = imm_dev(cmd->device->host);
620 /* NOTE: IMM uses byte pairs */
621 for (k = 0; k < cmd->cmd_len; k += 2)
622 if (!imm_out(dev, &cmd->cmnd[k], 2))
628 * The bulk flag enables some optimisations in the data transfer loops,
629 * it should be true for any command that transfers data in integral
630 * numbers of sectors.
632 * The driver appears to remain stable if we speed up the parallel port
633 * i/o in this function, but not elsewhere.
635 static int imm_completion(struct scsi_cmnd *const cmd)
640 * 1 Finished data transfer
642 struct scsi_pointer *scsi_pointer = imm_scsi_pointer(cmd);
643 imm_struct *dev = imm_dev(cmd->device->host);
644 unsigned short ppb = dev->base;
645 unsigned long start_jiffies = jiffies;
648 int fast, bulk, status;
651 bulk = ((v == READ_6) ||
652 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
655 * We only get here if the drive is ready to comunicate,
656 * hence no need for a full imm_wait.
659 r = (r_str(ppb) & 0xb8);
662 * while (device is not ready to send status byte)
665 while (r != (unsigned char) 0xb8) {
667 * If we have been running for more than a full timer tick
670 if (time_after(jiffies, start_jiffies + 1))
675 * a) Drive status is screwy (!ready && !present)
676 * b) Drive is requesting/sending more data than expected
678 if ((r & 0x88) != 0x88 || scsi_pointer->this_residual <= 0) {
679 imm_fail(dev, DID_ERROR);
680 return -1; /* ERROR_RETURN */
682 /* determine if we should use burst I/O */
684 fast = bulk && scsi_pointer->this_residual >=
685 IMM_BURST_SIZE ? IMM_BURST_SIZE : 2;
686 status = imm_out(dev, scsi_pointer->ptr, fast);
688 fast = bulk && scsi_pointer->this_residual >=
689 IMM_BURST_SIZE ? IMM_BURST_SIZE : 1;
690 status = imm_in(dev, scsi_pointer->ptr, fast);
693 scsi_pointer->ptr += fast;
694 scsi_pointer->this_residual -= fast;
697 imm_fail(dev, DID_BUS_BUSY);
698 return -1; /* ERROR_RETURN */
700 if (scsi_pointer->buffer && !scsi_pointer->this_residual) {
701 /* if scatter/gather, advance to the next segment */
702 if (scsi_pointer->buffers_residual--) {
703 scsi_pointer->buffer =
704 sg_next(scsi_pointer->buffer);
705 scsi_pointer->this_residual =
706 scsi_pointer->buffer->length;
707 scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);
710 * Make sure that we transfer even number of bytes
711 * otherwise it makes imm_byte_out() messy.
713 if (scsi_pointer->this_residual & 0x01)
714 scsi_pointer->this_residual++;
717 /* Now check to see if the drive is ready to comunicate */
719 r = (r_str(ppb) & 0xb8);
721 /* If not, drop back down to the scheduler and wait a timer tick */
725 return 1; /* FINISH_RETURN */
729 * Since the IMM itself doesn't generate interrupts, we use
730 * the scheduler's task queue to generate a stream of call-backs and
731 * complete the request when the drive is ready.
733 static void imm_interrupt(struct work_struct *work)
735 imm_struct *dev = container_of(work, imm_struct, imm_tq.work);
736 struct scsi_cmnd *cmd = dev->cur_cmd;
737 struct Scsi_Host *host = cmd->device->host;
740 if (imm_engine(dev, cmd)) {
741 schedule_delayed_work(&dev->imm_tq, 1);
744 /* Command must of completed hence it is safe to let go... */
746 switch ((cmd->result >> 16) & 0xff) {
750 printk("imm: no device at SCSI ID %i\n", cmd->device->id);
753 printk("imm: BUS BUSY - EPP timeout detected\n");
756 printk("imm: unknown timeout\n");
759 printk("imm: told to abort\n");
762 printk("imm: parity error (???)\n");
765 printk("imm: internal driver error\n");
768 printk("imm: told to reset device\n");
771 printk("imm: bad interrupt (???)\n");
774 printk("imm: bad return code (%02x)\n",
775 (cmd->result >> 16) & 0xff);
779 if (imm_scsi_pointer(cmd)->phase > 1)
784 spin_lock_irqsave(host->host_lock, flags);
787 spin_unlock_irqrestore(host->host_lock, flags);
791 static int imm_engine(imm_struct *dev, struct scsi_cmnd *const cmd)
793 struct scsi_pointer *scsi_pointer = imm_scsi_pointer(cmd);
794 unsigned short ppb = dev->base;
795 unsigned char l = 0, h = 0;
798 /* First check for any errors that may have occurred
799 * Here we check for internal errors
804 switch (scsi_pointer->phase) {
805 case 0: /* Phase 0 - Waiting for parport */
806 if (time_after(jiffies, dev->jstart + HZ)) {
808 * We waited more than a second
809 * for parport to call us
811 imm_fail(dev, DID_BUS_BUSY);
814 return 1; /* wait until imm_wakeup claims parport */
816 case 1: /* Phase 1 - Connected */
817 imm_connect(dev, CONNECT_EPP_MAYBE);
818 scsi_pointer->phase++;
821 case 2: /* Phase 2 - We are now talking to the scsi bus */
822 if (!imm_select(dev, scmd_id(cmd))) {
823 imm_fail(dev, DID_NO_CONNECT);
826 scsi_pointer->phase++;
829 case 3: /* Phase 3 - Ready to accept a command */
831 if (!(r_str(ppb) & 0x80))
834 if (!imm_send_command(cmd))
836 scsi_pointer->phase++;
839 case 4: /* Phase 4 - Setup scatter/gather buffers */
840 if (scsi_bufflen(cmd)) {
841 scsi_pointer->buffer = scsi_sglist(cmd);
842 scsi_pointer->this_residual = scsi_pointer->buffer->length;
843 scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);
845 scsi_pointer->buffer = NULL;
846 scsi_pointer->this_residual = 0;
847 scsi_pointer->ptr = NULL;
849 scsi_pointer->buffers_residual = scsi_sg_count(cmd) - 1;
850 scsi_pointer->phase++;
851 if (scsi_pointer->this_residual & 0x01)
852 scsi_pointer->this_residual++;
855 case 5: /* Phase 5 - Pre-Data transfer stage */
856 /* Spin lock for BUSY */
858 if (!(r_str(ppb) & 0x80))
861 /* Require negotiation for read requests */
862 x = (r_str(ppb) & 0xb8);
863 dev->rd = (x & 0x10) ? 1 : 0;
864 dev->dp = (x & 0x20) ? 0 : 1;
866 if ((dev->dp) && (dev->rd))
867 if (imm_negotiate(dev))
869 scsi_pointer->phase++;
872 case 6: /* Phase 6 - Data transfer stage */
873 /* Spin lock for BUSY */
875 if (!(r_str(ppb) & 0x80))
879 retv = imm_completion(cmd);
885 scsi_pointer->phase++;
888 case 7: /* Phase 7 - Post data transfer stage */
889 if ((dev->dp) && (dev->rd)) {
890 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) {
897 scsi_pointer->phase++;
900 case 8: /* Phase 8 - Read status/message */
901 /* Check for data overrun */
902 if (imm_wait(dev) != (unsigned char) 0xb8) {
903 imm_fail(dev, DID_ERROR);
906 if (imm_negotiate(dev))
908 if (imm_in(dev, &l, 1)) { /* read status byte */
909 /* Check for optional message byte */
910 if (imm_wait(dev) == (unsigned char) 0xb8)
912 cmd->result = (DID_OK << 16) | (l & STATUS_MASK);
914 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) {
920 return 0; /* Finished */
923 printk("imm: Invalid scsi phase\n");
928 static int imm_queuecommand_lck(struct scsi_cmnd *cmd)
930 imm_struct *dev = imm_dev(cmd->device->host);
933 printk("IMM: bug in imm_queuecommand\n");
937 dev->jstart = jiffies;
939 cmd->result = DID_ERROR << 16; /* default return code */
940 imm_scsi_pointer(cmd)->phase = 0; /* bus free */
942 schedule_delayed_work(&dev->imm_tq, 0);
949 static DEF_SCSI_QCMD(imm_queuecommand)
952 * Apparently the disk->capacity attribute is off by 1 sector
953 * for all disk drives. We add the one here, but it should really
954 * be done in sd.c. Even if it gets fixed there, this will still
957 static int imm_biosparam(struct scsi_device *sdev, struct block_device *dev,
958 sector_t capacity, int ip[])
962 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
966 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
971 static int imm_abort(struct scsi_cmnd *cmd)
973 imm_struct *dev = imm_dev(cmd->device->host);
975 * There is no method for aborting commands since Iomega
976 * have tied the SCSI_MESSAGE line high in the interface
979 switch (imm_scsi_pointer(cmd)->phase) {
980 case 0: /* Do not have access to parport */
981 case 1: /* Have not connected to interface */
982 dev->cur_cmd = NULL; /* Forget the problem */
984 default: /* SCSI command sent, can not abort */
989 static void imm_reset_pulse(unsigned int base)
1001 static int imm_reset(struct scsi_cmnd *cmd)
1003 imm_struct *dev = imm_dev(cmd->device->host);
1005 if (imm_scsi_pointer(cmd)->phase)
1006 imm_disconnect(dev);
1007 dev->cur_cmd = NULL; /* Forget the problem */
1009 imm_connect(dev, CONNECT_NORMAL);
1010 imm_reset_pulse(dev->base);
1011 mdelay(1); /* device settle delay */
1012 imm_disconnect(dev);
1013 mdelay(1); /* device settle delay */
1017 static int device_check(imm_struct *dev, bool autodetect)
1019 /* This routine looks for a device and then attempts to use EPP
1020 to send a command. If all goes as planned then EPP is available. */
1022 static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1023 int loop, old_mode, status, k, ppb = dev->base;
1026 old_mode = dev->mode;
1027 for (loop = 0; loop < 8; loop++) {
1028 /* Attempt to use EPP for Test Unit Ready */
1029 if (autodetect && (ppb & 0x0007) == 0x0000)
1030 dev->mode = IMM_EPP_8;
1033 imm_connect(dev, CONNECT_EPP_MAYBE);
1034 /* Select SCSI device */
1035 if (!imm_select(dev, loop)) {
1036 imm_disconnect(dev);
1039 printk("imm: Found device at ID %i, Attempting to use %s\n",
1040 loop, IMM_MODE_STRING[dev->mode]);
1042 /* Send SCSI command */
1045 for (l = 0; (l < 3) && (status); l++)
1046 status = imm_out(dev, &cmd[l << 1], 2);
1049 imm_disconnect(dev);
1050 imm_connect(dev, CONNECT_EPP_MAYBE);
1051 imm_reset_pulse(dev->base);
1053 imm_disconnect(dev);
1055 if (dev->mode != old_mode) {
1056 dev->mode = old_mode;
1059 printk("imm: Unable to establish communication\n");
1064 k = 1000000; /* 1 Second */
1069 } while (!(l & 0x80) && (k));
1074 imm_disconnect(dev);
1075 imm_connect(dev, CONNECT_EPP_MAYBE);
1076 imm_reset_pulse(dev->base);
1078 imm_disconnect(dev);
1080 if (dev->mode != old_mode) {
1081 dev->mode = old_mode;
1085 ("imm: Unable to establish communication\n");
1088 imm_disconnect(dev);
1090 ("imm: Communication established at 0x%x with ID %i using %s\n",
1091 ppb, loop, IMM_MODE_STRING[dev->mode]);
1092 imm_connect(dev, CONNECT_EPP_MAYBE);
1093 imm_reset_pulse(dev->base);
1095 imm_disconnect(dev);
1099 printk("imm: No devices found\n");
1104 * imm cannot deal with highmem, so this causes all IO pages for this host
1105 * to reside in low memory (hence mapped)
1107 static int imm_adjust_queue(struct scsi_device *device)
1109 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
1113 static const struct scsi_host_template imm_template = {
1114 .module = THIS_MODULE,
1116 .show_info = imm_show_info,
1117 .write_info = imm_write_info,
1118 .name = "Iomega VPI2 (imm) interface",
1119 .queuecommand = imm_queuecommand,
1120 .eh_abort_handler = imm_abort,
1121 .eh_host_reset_handler = imm_reset,
1122 .bios_param = imm_biosparam,
1124 .sg_tablesize = SG_ALL,
1126 .slave_alloc = imm_adjust_queue,
1127 .cmd_size = sizeof(struct scsi_pointer),
1130 /***************************************************************************
1131 * Parallel port probing routines *
1132 ***************************************************************************/
1134 static LIST_HEAD(imm_hosts);
1137 * Finds the first available device number that can be alloted to the
1138 * new imm device and returns the address of the previous node so that
1139 * we can add to the tail and have a list in the ascending order.
1142 static inline imm_struct *find_parent(void)
1144 imm_struct *dev, *par = NULL;
1145 unsigned int cnt = 0;
1147 if (list_empty(&imm_hosts))
1150 list_for_each_entry(dev, &imm_hosts, list) {
1151 if (dev->dev_no != cnt)
1160 static int __imm_attach(struct parport *pb)
1162 struct Scsi_Host *host;
1163 imm_struct *dev, *temp;
1164 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
1168 struct pardev_cb imm_cb;
1170 init_waitqueue_head(&waiting);
1172 dev = kzalloc(sizeof(imm_struct), GFP_KERNEL);
1178 dev->mode = mode < IMM_UNKNOWN ? mode : IMM_AUTODETECT;
1179 INIT_LIST_HEAD(&dev->list);
1181 temp = find_parent();
1183 dev->dev_no = temp->dev_no + 1;
1185 memset(&imm_cb, 0, sizeof(imm_cb));
1186 imm_cb.private = dev;
1187 imm_cb.wakeup = imm_wakeup;
1189 dev->dev = parport_register_dev_model(pb, "imm", &imm_cb, dev->dev_no);
1194 /* Claim the bus so it remembers what we do to the control
1195 * registers. [ CTR and ECP ]
1198 dev->waiting = &waiting;
1199 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1200 if (imm_pb_claim(dev))
1201 schedule_timeout(3 * HZ);
1203 printk(KERN_ERR "imm%d: failed to claim parport because "
1204 "a pardevice is owning the port for too long "
1205 "time!\n", pb->number);
1206 imm_pb_dismiss(dev);
1207 dev->waiting = NULL;
1208 finish_wait(&waiting, &wait);
1211 dev->waiting = NULL;
1212 finish_wait(&waiting, &wait);
1213 dev->base = dev->dev->port->base;
1214 dev->base_hi = dev->dev->port->base_hi;
1215 w_ctr(dev->base, 0x0c);
1217 /* Done configuration */
1219 err = imm_init(dev);
1221 imm_pb_release(dev);
1226 /* now the glue ... */
1227 if (dev->mode == IMM_NIBBLE || dev->mode == IMM_PS2)
1232 INIT_DELAYED_WORK(&dev->imm_tq, imm_interrupt);
1235 host = scsi_host_alloc(&imm_template, sizeof(imm_struct *));
1238 host->io_port = pb->base;
1239 host->n_io_port = ports;
1240 host->dma_channel = -1;
1241 host->unique_id = pb->number;
1242 *(imm_struct **)&host->hostdata = dev;
1245 list_add_tail(&dev->list, &imm_hosts);
1247 list_add_tail(&dev->list, &temp->list);
1248 err = scsi_add_host(host, NULL);
1251 scsi_scan_host(host);
1255 list_del_init(&dev->list);
1256 scsi_host_put(host);
1258 parport_unregister_device(dev->dev);
1264 static void imm_attach(struct parport *pb)
1269 static void imm_detach(struct parport *pb)
1272 list_for_each_entry(dev, &imm_hosts, list) {
1273 if (dev->dev->port == pb) {
1274 list_del_init(&dev->list);
1275 scsi_remove_host(dev->host);
1276 scsi_host_put(dev->host);
1277 parport_unregister_device(dev->dev);
1284 static struct parport_driver imm_driver = {
1286 .match_port = imm_attach,
1287 .detach = imm_detach,
1290 module_parport_driver(imm_driver);
1292 MODULE_LICENSE("GPL");