1 /* ppa.c -- low level driver for the IOMEGA PPA3
2 * parallel port SCSI host adapter.
4 * (The PPA3 is the embedded controller in the ZIP drive.)
6 * (c) 1995,1996 Grant R. Guenther, grant@torque.net,
7 * under the terms of the GNU General Public License.
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.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/jiffies.h>
22 #include <scsi/scsi.h>
23 #include <scsi/scsi_cmnd.h>
24 #include <scsi/scsi_device.h>
25 #include <scsi/scsi_host.h>
28 static void ppa_reset_pulse(unsigned int base);
31 struct pardevice *dev; /* Parport device entry */
32 int base; /* Actual port address */
33 int mode; /* Transfer mode */
34 struct scsi_cmnd *cur_cmd; /* Current queued command */
35 struct delayed_work ppa_tq; /* Polling interrupt stuff */
36 unsigned long jstart; /* Jiffies at start */
37 unsigned long recon_tmo; /* How many usecs to wait for reconnection (6th bit) */
38 unsigned int failed:1; /* Failure flag */
39 unsigned wanted:1; /* Parport sharing busy flag */
40 unsigned int dev_no; /* Device number */
41 wait_queue_head_t *waiting;
42 struct Scsi_Host *host;
43 struct list_head list;
48 static inline ppa_struct *ppa_dev(struct Scsi_Host *host)
50 return *(ppa_struct **)&host->hostdata;
53 static DEFINE_SPINLOCK(arbitration_lock);
55 static void got_it(ppa_struct *dev)
57 dev->base = dev->dev->port->base;
59 dev->cur_cmd->SCp.phase = 1;
61 wake_up(dev->waiting);
64 static void ppa_wakeup(void *ref)
66 ppa_struct *dev = (ppa_struct *) ref;
69 spin_lock_irqsave(&arbitration_lock, flags);
71 parport_claim(dev->dev);
75 spin_unlock_irqrestore(&arbitration_lock, flags);
79 static int ppa_pb_claim(ppa_struct *dev)
83 spin_lock_irqsave(&arbitration_lock, flags);
84 if (parport_claim(dev->dev) == 0) {
89 spin_unlock_irqrestore(&arbitration_lock, flags);
93 static void ppa_pb_dismiss(ppa_struct *dev)
97 spin_lock_irqsave(&arbitration_lock, flags);
100 spin_unlock_irqrestore(&arbitration_lock, flags);
102 parport_release(dev->dev);
105 static inline void ppa_pb_release(ppa_struct *dev)
107 parport_release(dev->dev);
111 * Start of Chipset kludges
114 /* This is to give the ppa driver a way to modify the timings (and other
115 * parameters) by writing to the /proc/scsi/ppa/0 file.
116 * Very simple method really... (To simple, no error checking :( )
117 * Reason: Kernel hackers HATE having to unload and reload modules for
119 * Also gives a method to use a script to obtain optimum timings (TODO)
122 static inline int ppa_write_info(struct Scsi_Host *host, char *buffer, int length)
124 ppa_struct *dev = ppa_dev(host);
127 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
128 x = simple_strtoul(buffer + 5, NULL, 0);
132 if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) {
133 x = simple_strtoul(buffer + 10, NULL, 0);
135 printk(KERN_INFO "ppa: recon_tmo set to %ld\n", x);
138 printk(KERN_WARNING "ppa /proc: invalid variable\n");
142 static int ppa_show_info(struct seq_file *m, struct Scsi_Host *host)
144 ppa_struct *dev = ppa_dev(host);
146 seq_printf(m, "Version : %s\n", PPA_VERSION);
147 seq_printf(m, "Parport : %s\n", dev->dev->port->name);
148 seq_printf(m, "Mode : %s\n", PPA_MODE_STRING[dev->mode]);
150 seq_printf(m, "recon_tmo : %lu\n", dev->recon_tmo);
155 static int device_check(ppa_struct *dev);
158 #define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
159 y, __func__, __LINE__); ppa_fail_func(x,y);
160 static inline void ppa_fail_func(ppa_struct *dev, int error_code)
162 static inline void ppa_fail(ppa_struct *dev, int error_code)
165 /* If we fail a device then we trash status / message bytes */
167 dev->cur_cmd->result = error_code << 16;
173 * Wait for the high bit to be set.
175 * In principle, this could be tied to an interrupt, but the adapter
176 * doesn't appear to be designed to support interrupts. We spin on
177 * the 0x80 ready bit.
179 static unsigned char ppa_wait(ppa_struct *dev)
182 unsigned short ppb = dev->base;
186 /* Wait for bit 6 and 7 - PJC */
187 for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) {
193 * return some status information.
194 * Semantics: 0xc0 = ZIP wants more data
195 * 0xd0 = ZIP wants to send more data
196 * 0xe0 = ZIP is expecting SCSI command data
197 * 0xf0 = end of transfer, ZIP is sending status
202 /* Counter expired - Time out occurred */
203 ppa_fail(dev, DID_TIME_OUT);
204 printk(KERN_WARNING "ppa timeout in ppa_wait\n");
205 return 0; /* command timed out */
209 * Clear EPP Timeout Bit
211 static inline void epp_reset(unsigned short ppb)
217 w_str(ppb, i & 0xfe);
221 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
223 static inline void ecp_sync(ppa_struct *dev)
225 int i, ppb_hi = dev->dev->port->base_hi;
230 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
231 for (i = 0; i < 100; i++) {
232 if (r_ecr(ppb_hi) & 0x01)
236 printk(KERN_WARNING "ppa: ECP sync failed as data still present in FIFO.\n");
240 static int ppa_byte_out(unsigned short base, const char *buffer, int len)
244 for (i = len; i; i--) {
245 w_dtr(base, *buffer++);
249 return 1; /* All went well - we hope! */
252 static int ppa_byte_in(unsigned short base, char *buffer, int len)
256 for (i = len; i; i--) {
257 *buffer++ = r_dtr(base);
261 return 1; /* All went well - we hope! */
264 static int ppa_nibble_in(unsigned short base, char *buffer, int len)
270 h = r_str(base) & 0xf0;
272 *buffer++ = h | ((r_str(base) & 0xf0) >> 4);
274 return 1; /* All went well - we hope! */
277 static int ppa_out(ppa_struct *dev, char *buffer, int len)
280 unsigned short ppb = dev->base;
284 if ((r & 0x50) != 0x40) {
285 ppa_fail(dev, DID_ERROR);
291 /* 8 bit output, with a loop */
292 r = ppa_byte_out(ppb, buffer, len);
300 #ifdef CONFIG_SCSI_IZIP_EPP16
301 if (!(((long) buffer | len) & 0x01))
302 outsw(ppb + 4, buffer, len >> 1);
304 if (!(((long) buffer | len) & 0x03))
305 outsl(ppb + 4, buffer, len >> 2);
308 outsb(ppb + 4, buffer, len);
310 r = !(r_str(ppb) & 0x01);
316 printk(KERN_ERR "PPA: bug in ppa_out()\n");
322 static int ppa_in(ppa_struct *dev, char *buffer, int len)
325 unsigned short ppb = dev->base;
329 if ((r & 0x50) != 0x50) {
330 ppa_fail(dev, DID_ERROR);
335 /* 4 bit input, with a loop */
336 r = ppa_nibble_in(ppb, buffer, len);
341 /* 8 bit input, with a loop */
343 r = ppa_byte_in(ppb, buffer, len);
353 #ifdef CONFIG_SCSI_IZIP_EPP16
354 if (!(((long) buffer | len) & 0x01))
355 insw(ppb + 4, buffer, len >> 1);
357 if (!(((long) buffer | len) & 0x03))
358 insl(ppb + 4, buffer, len >> 2);
361 insb(ppb + 4, buffer, len);
363 r = !(r_str(ppb) & 0x01);
369 printk(KERN_ERR "PPA: bug in ppa_ins()\n");
376 /* end of ppa_io.h */
377 static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
387 static void ppa_disconnect(ppa_struct *dev)
389 unsigned short ppb = dev->base;
392 ppa_d_pulse(ppb, 0x3c);
393 ppa_d_pulse(ppb, 0x20);
394 ppa_d_pulse(ppb, 0xf);
397 static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
406 static inline void ppa_connect(ppa_struct *dev, int flag)
408 unsigned short ppb = dev->base;
411 ppa_c_pulse(ppb, 0x3c);
412 ppa_c_pulse(ppb, 0x20);
413 if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode))
414 ppa_c_pulse(ppb, 0xcf);
416 ppa_c_pulse(ppb, 0x8f);
419 static int ppa_select(ppa_struct *dev, int target)
422 unsigned short ppb = dev->base;
425 * Bit 6 (0x40) is the device selected bit.
426 * First we must wait till the current device goes off line...
432 } while ((r_str(ppb) & 0x40) && (k));
436 w_dtr(ppb, (1 << target));
439 w_dtr(ppb, 0x80); /* This is NOT the initator */
447 while (!(r_str(ppb) & 0x40) && (k));
455 * This is based on a trace of what the Iomega DOS 'guest' driver does.
456 * I've tried several different kinds of parallel ports with guest and
457 * coded this to react in the same ways that it does.
459 * The return value from this function is just a hint about where the
460 * handshaking failed.
463 static int ppa_init(ppa_struct *dev)
466 unsigned short ppb = dev->base;
469 ppa_connect(dev, CONNECT_NORMAL);
471 retv = 2; /* Failed */
474 if ((r_str(ppb) & 0x08) == 0x08)
478 if ((r_str(ppb) & 0x08) == 0x00)
482 ppa_reset_pulse(ppb);
483 udelay(1000); /* Allow devices to settle down */
485 udelay(1000); /* Another delay to allow devices to settle */
490 return device_check(dev);
493 static inline int ppa_send_command(struct scsi_cmnd *cmd)
495 ppa_struct *dev = ppa_dev(cmd->device->host);
498 w_ctr(dev->base, 0x0c);
500 for (k = 0; k < cmd->cmd_len; k++)
501 if (!ppa_out(dev, &cmd->cmnd[k], 1))
507 * The bulk flag enables some optimisations in the data transfer loops,
508 * it should be true for any command that transfers data in integral
509 * numbers of sectors.
511 * The driver appears to remain stable if we speed up the parallel port
512 * i/o in this function, but not elsewhere.
514 static int ppa_completion(struct scsi_cmnd *cmd)
519 * 1 Finished data transfer
521 ppa_struct *dev = ppa_dev(cmd->device->host);
522 unsigned short ppb = dev->base;
523 unsigned long start_jiffies = jiffies;
526 int fast, bulk, status;
529 bulk = ((v == READ_6) ||
530 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
533 * We only get here if the drive is ready to comunicate,
534 * hence no need for a full ppa_wait.
536 r = (r_str(ppb) & 0xf0);
538 while (r != (unsigned char) 0xf0) {
540 * If we have been running for more than a full timer tick
543 if (time_after(jiffies, start_jiffies + 1))
546 if ((cmd->SCp.this_residual <= 0)) {
547 ppa_fail(dev, DID_ERROR);
548 return -1; /* ERROR_RETURN */
551 /* On some hardware we have SCSI disconnected (6th bit low)
552 * for about 100usecs. It is too expensive to wait a
553 * tick on every loop so we busy wait for no more than
554 * 500usecs to give the drive a chance first. We do not
555 * change things for "normal" hardware since generally
556 * the 6th bit is always high.
557 * This makes the CPU load higher on some hardware
558 * but otherwise we can not get more than 50K/secs
559 * on this problem hardware.
561 if ((r & 0xc0) != 0xc0) {
562 /* Wait for reconnection should be no more than
563 * jiffy/2 = 5ms = 5000 loops
565 unsigned long k = dev->recon_tmo;
566 for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0;
574 /* determine if we should use burst I/O */
575 fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
576 ? PPA_BURST_SIZE : 1;
578 if (r == (unsigned char) 0xc0)
579 status = ppa_out(dev, cmd->SCp.ptr, fast);
581 status = ppa_in(dev, cmd->SCp.ptr, fast);
583 cmd->SCp.ptr += fast;
584 cmd->SCp.this_residual -= fast;
587 ppa_fail(dev, DID_BUS_BUSY);
588 return -1; /* ERROR_RETURN */
590 if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
591 /* if scatter/gather, advance to the next segment */
592 if (cmd->SCp.buffers_residual--) {
593 cmd->SCp.buffer = sg_next(cmd->SCp.buffer);
594 cmd->SCp.this_residual =
595 cmd->SCp.buffer->length;
596 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
599 /* Now check to see if the drive is ready to comunicate */
600 r = (r_str(ppb) & 0xf0);
601 /* If not, drop back down to the scheduler and wait a timer tick */
605 return 1; /* FINISH_RETURN */
609 * Since the PPA itself doesn't generate interrupts, we use
610 * the scheduler's task queue to generate a stream of call-backs and
611 * complete the request when the drive is ready.
613 static void ppa_interrupt(struct work_struct *work)
615 ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work);
616 struct scsi_cmnd *cmd = dev->cur_cmd;
619 printk(KERN_ERR "PPA: bug in ppa_interrupt\n");
622 if (ppa_engine(dev, cmd)) {
623 schedule_delayed_work(&dev->ppa_tq, 1);
626 /* Command must of completed hence it is safe to let go... */
628 switch ((cmd->result >> 16) & 0xff) {
632 printk(KERN_DEBUG "ppa: no device at SCSI ID %i\n", cmd->device->target);
635 printk(KERN_DEBUG "ppa: BUS BUSY - EPP timeout detected\n");
638 printk(KERN_DEBUG "ppa: unknown timeout\n");
641 printk(KERN_DEBUG "ppa: told to abort\n");
644 printk(KERN_DEBUG "ppa: parity error (???)\n");
647 printk(KERN_DEBUG "ppa: internal driver error\n");
650 printk(KERN_DEBUG "ppa: told to reset device\n");
653 printk(KERN_WARNING "ppa: bad interrupt (???)\n");
656 printk(KERN_WARNING "ppa: bad return code (%02x)\n",
657 (cmd->result >> 16) & 0xff);
661 if (cmd->SCp.phase > 1)
671 static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd)
673 unsigned short ppb = dev->base;
674 unsigned char l = 0, h = 0;
677 /* First check for any errors that may of occurred
678 * Here we check for internal errors
683 switch (cmd->SCp.phase) {
684 case 0: /* Phase 0 - Waiting for parport */
685 if (time_after(jiffies, dev->jstart + HZ)) {
687 * We waited more than a second
688 * for parport to call us
690 ppa_fail(dev, DID_BUS_BUSY);
693 return 1; /* wait until ppa_wakeup claims parport */
694 case 1: /* Phase 1 - Connected */
695 { /* Perform a sanity check for cable unplugged */
696 int retv = 2; /* Failed */
698 ppa_connect(dev, CONNECT_EPP_MAYBE);
701 if ((r_str(ppb) & 0x08) == 0x08)
705 if ((r_str(ppb) & 0x08) == 0x00)
709 if (time_after(jiffies, dev->jstart + (1 * HZ))) {
710 printk(KERN_ERR "ppa: Parallel port cable is unplugged.\n");
711 ppa_fail(dev, DID_BUS_BUSY);
715 return 1; /* Try again in a jiffy */
722 case 2: /* Phase 2 - We are now talking to the scsi bus */
723 if (!ppa_select(dev, scmd_id(cmd))) {
724 ppa_fail(dev, DID_NO_CONNECT);
730 case 3: /* Phase 3 - Ready to accept a command */
732 if (!(r_str(ppb) & 0x80))
735 if (!ppa_send_command(cmd))
740 case 4: /* Phase 4 - Setup scatter/gather buffers */
741 if (scsi_bufflen(cmd)) {
742 cmd->SCp.buffer = scsi_sglist(cmd);
743 cmd->SCp.this_residual = cmd->SCp.buffer->length;
744 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
746 cmd->SCp.buffer = NULL;
747 cmd->SCp.this_residual = 0;
750 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
754 case 5: /* Phase 5 - Data transfer stage */
756 if (!(r_str(ppb) & 0x80))
759 retv = ppa_completion(cmd);
767 case 6: /* Phase 6 - Read status/message */
768 cmd->result = DID_OK << 16;
769 /* Check for data overrun */
770 if (ppa_wait(dev) != (unsigned char) 0xf0) {
771 ppa_fail(dev, DID_ERROR);
774 if (ppa_in(dev, &l, 1)) { /* read status byte */
775 /* Check for optional message byte */
776 if (ppa_wait(dev) == (unsigned char) 0xf0)
779 (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
781 return 0; /* Finished */
784 printk(KERN_ERR "ppa: Invalid scsi phase\n");
789 static int ppa_queuecommand_lck(struct scsi_cmnd *cmd,
790 void (*done) (struct scsi_cmnd *))
792 ppa_struct *dev = ppa_dev(cmd->device->host);
795 printk(KERN_ERR "PPA: bug in ppa_queuecommand\n");
799 dev->jstart = jiffies;
801 cmd->scsi_done = done;
802 cmd->result = DID_ERROR << 16; /* default return code */
803 cmd->SCp.phase = 0; /* bus free */
805 schedule_delayed_work(&dev->ppa_tq, 0);
812 static DEF_SCSI_QCMD(ppa_queuecommand)
815 * Apparently the disk->capacity attribute is off by 1 sector
816 * for all disk drives. We add the one here, but it should really
817 * be done in sd.c. Even if it gets fixed there, this will still
820 static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev,
821 sector_t capacity, int ip[])
825 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
829 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
836 static int ppa_abort(struct scsi_cmnd *cmd)
838 ppa_struct *dev = ppa_dev(cmd->device->host);
840 * There is no method for aborting commands since Iomega
841 * have tied the SCSI_MESSAGE line high in the interface
844 switch (cmd->SCp.phase) {
845 case 0: /* Do not have access to parport */
846 case 1: /* Have not connected to interface */
847 dev->cur_cmd = NULL; /* Forget the problem */
849 default: /* SCSI command sent, can not abort */
854 static void ppa_reset_pulse(unsigned int base)
862 static int ppa_reset(struct scsi_cmnd *cmd)
864 ppa_struct *dev = ppa_dev(cmd->device->host);
868 dev->cur_cmd = NULL; /* Forget the problem */
870 ppa_connect(dev, CONNECT_NORMAL);
871 ppa_reset_pulse(dev->base);
872 mdelay(1); /* device settle delay */
874 mdelay(1); /* device settle delay */
878 static int device_check(ppa_struct *dev)
880 /* This routine looks for a device and then attempts to use EPP
881 to send a command. If all goes as planned then EPP is available. */
883 static u8 cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
884 int loop, old_mode, status, k, ppb = dev->base;
887 old_mode = dev->mode;
888 for (loop = 0; loop < 8; loop++) {
889 /* Attempt to use EPP for Test Unit Ready */
890 if ((ppb & 0x0007) == 0x0000)
891 dev->mode = PPA_EPP_32;
894 ppa_connect(dev, CONNECT_EPP_MAYBE);
895 /* Select SCSI device */
896 if (!ppa_select(dev, loop)) {
900 printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n",
901 loop, PPA_MODE_STRING[dev->mode]);
903 /* Send SCSI command */
906 for (l = 0; (l < 6) && (status); l++)
907 status = ppa_out(dev, cmd, 1);
911 ppa_connect(dev, CONNECT_EPP_MAYBE);
919 if (dev->mode == PPA_EPP_32) {
920 dev->mode = old_mode;
926 k = 1000000; /* 1 Second */
931 } while (!(l & 0x80) && (k));
937 ppa_connect(dev, CONNECT_EPP_MAYBE);
938 ppa_reset_pulse(ppb);
942 if (dev->mode == PPA_EPP_32) {
943 dev->mode = old_mode;
949 printk(KERN_INFO "ppa: Communication established with ID %i using %s\n",
950 loop, PPA_MODE_STRING[dev->mode]);
951 ppa_connect(dev, CONNECT_EPP_MAYBE);
952 ppa_reset_pulse(ppb);
961 static int ppa_adjust_queue(struct scsi_device *device)
963 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
967 static struct scsi_host_template ppa_template = {
968 .module = THIS_MODULE,
970 .show_info = ppa_show_info,
971 .write_info = ppa_write_info,
972 .name = "Iomega VPI0 (ppa) interface",
973 .queuecommand = ppa_queuecommand,
974 .eh_abort_handler = ppa_abort,
975 .eh_host_reset_handler = ppa_reset,
976 .bios_param = ppa_biosparam,
978 .sg_tablesize = SG_ALL,
980 .slave_alloc = ppa_adjust_queue,
983 /***************************************************************************
984 * Parallel port probing routines *
985 ***************************************************************************/
987 static LIST_HEAD(ppa_hosts);
990 * Finds the first available device number that can be alloted to the
991 * new ppa device and returns the address of the previous node so that
992 * we can add to the tail and have a list in the ascending order.
995 static inline ppa_struct *find_parent(void)
997 ppa_struct *dev, *par = NULL;
998 unsigned int cnt = 0;
1000 if (list_empty(&ppa_hosts))
1003 list_for_each_entry(dev, &ppa_hosts, list) {
1004 if (dev->dev_no != cnt)
1013 static int __ppa_attach(struct parport *pb)
1015 struct Scsi_Host *host;
1016 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
1018 ppa_struct *dev, *temp;
1020 int modes, ppb, ppb_hi;
1022 struct pardev_cb ppa_cb;
1024 dev = kzalloc(sizeof(ppa_struct), GFP_KERNEL);
1028 dev->mode = PPA_AUTODETECT;
1029 dev->recon_tmo = PPA_RECON_TMO;
1030 init_waitqueue_head(&waiting);
1031 temp = find_parent();
1033 dev->dev_no = temp->dev_no + 1;
1035 memset(&ppa_cb, 0, sizeof(ppa_cb));
1036 ppa_cb.private = dev;
1037 ppa_cb.wakeup = ppa_wakeup;
1039 dev->dev = parport_register_dev_model(pb, "ppa", &ppa_cb, dev->dev_no);
1044 /* Claim the bus so it remembers what we do to the control
1045 * registers. [ CTR and ECP ]
1048 dev->waiting = &waiting;
1049 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1050 if (ppa_pb_claim(dev))
1051 schedule_timeout(3 * HZ);
1053 printk(KERN_ERR "ppa%d: failed to claim parport because "
1054 "a pardevice is owning the port for too long "
1055 "time!\n", pb->number);
1056 ppa_pb_dismiss(dev);
1057 dev->waiting = NULL;
1058 finish_wait(&waiting, &wait);
1061 dev->waiting = NULL;
1062 finish_wait(&waiting, &wait);
1063 ppb = dev->base = dev->dev->port->base;
1064 ppb_hi = dev->dev->port->base_hi;
1066 modes = dev->dev->port->modes;
1068 /* Mode detection works up the chain of speed
1069 * This avoids a nasty if-then-else-if-... tree
1071 dev->mode = PPA_NIBBLE;
1073 if (modes & PARPORT_MODE_TRISTATE)
1074 dev->mode = PPA_PS2;
1076 if (modes & PARPORT_MODE_ECP) {
1077 w_ecr(ppb_hi, 0x20);
1078 dev->mode = PPA_PS2;
1080 if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
1081 w_ecr(ppb_hi, 0x80);
1083 /* Done configuration */
1085 err = ppa_init(dev);
1086 ppa_pb_release(dev);
1091 /* now the glue ... */
1092 if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2)
1097 INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt);
1100 host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *));
1103 host->io_port = pb->base;
1104 host->n_io_port = ports;
1105 host->dma_channel = -1;
1106 host->unique_id = pb->number;
1107 *(ppa_struct **)&host->hostdata = dev;
1109 list_add_tail(&dev->list, &ppa_hosts);
1110 err = scsi_add_host(host, NULL);
1113 scsi_scan_host(host);
1116 list_del_init(&dev->list);
1117 scsi_host_put(host);
1119 parport_unregister_device(dev->dev);
1125 static void ppa_attach(struct parport *pb)
1130 static void ppa_detach(struct parport *pb)
1133 list_for_each_entry(dev, &ppa_hosts, list) {
1134 if (dev->dev->port == pb) {
1135 list_del_init(&dev->list);
1136 scsi_remove_host(dev->host);
1137 scsi_host_put(dev->host);
1138 parport_unregister_device(dev->dev);
1145 static struct parport_driver ppa_driver = {
1147 .match_port = ppa_attach,
1148 .detach = ppa_detach,
1152 static int __init ppa_driver_init(void)
1154 printk(KERN_INFO "ppa: Version %s\n", PPA_VERSION);
1155 return parport_register_driver(&ppa_driver);
1158 static void __exit ppa_driver_exit(void)
1160 parport_unregister_driver(&ppa_driver);
1163 module_init(ppa_driver_init);
1164 module_exit(ppa_driver_exit);
1165 MODULE_LICENSE("GPL");