2 * drivers/s390/cio/device.c
3 * bus driver for ccw devices
6 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
8 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
9 * Cornelia Huck (cohuck@de.ibm.com)
10 * Martin Schwidefsky (schwidefsky@de.ibm.com)
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/spinlock.h>
16 #include <linux/errno.h>
17 #include <linux/err.h>
18 #include <linux/slab.h>
19 #include <linux/list.h>
20 #include <linux/device.h>
21 #include <linux/workqueue.h>
23 #include <asm/ccwdev.h>
31 /******************* bus type handling ***********************/
33 /* The Linux driver model distinguishes between a bus type and
34 * the bus itself. Of course we only have one channel
35 * subsystem driver and one channel system per machine, but
36 * we still use the abstraction. T.R. says it's a good idea. */
38 ccw_bus_match (struct device * dev, struct device_driver * drv)
40 struct ccw_device *cdev = to_ccwdev(dev);
41 struct ccw_driver *cdrv = to_ccwdrv(drv);
42 const struct ccw_device_id *ids = cdrv->ids, *found;
47 found = ccw_device_id_match(ids, &cdev->id);
51 cdev->id.driver_info = found->driver_info;
57 * Hotplugging interface for ccw devices.
58 * Heavily modeled on pci and usb hotplug.
61 ccw_hotplug (struct device *dev, char **envp, int num_envp,
62 char *buffer, int buffer_size)
64 struct ccw_device *cdev = to_ccwdev(dev);
71 /* what we want to pass to /sbin/hotplug */
74 length += scnprintf(buffer, buffer_size - length, "CU_TYPE=%04X",
76 if ((buffer_size - length <= 0) || (i >= num_envp))
82 length += scnprintf(buffer, buffer_size - length, "CU_MODEL=%02X",
84 if ((buffer_size - length <= 0) || (i >= num_envp))
89 /* The next two can be zero, that's ok for us */
91 length += scnprintf(buffer, buffer_size - length, "DEV_TYPE=%04X",
93 if ((buffer_size - length <= 0) || (i >= num_envp))
99 length += scnprintf(buffer, buffer_size - length, "DEV_MODEL=%02X",
101 if ((buffer_size - length <= 0) || (i >= num_envp))
109 struct bus_type ccw_bus_type = {
111 .match = &ccw_bus_match,
112 .hotplug = &ccw_hotplug,
115 static int io_subchannel_probe (struct device *);
116 static int io_subchannel_remove (struct device *);
117 void io_subchannel_irq (struct device *);
118 static int io_subchannel_notify(struct device *, int);
119 static void io_subchannel_verify(struct device *);
120 static void io_subchannel_ioterm(struct device *);
121 static void io_subchannel_shutdown(struct device *);
123 struct css_driver io_subchannel_driver = {
124 .subchannel_type = SUBCHANNEL_TYPE_IO,
126 .name = "io_subchannel",
127 .bus = &css_bus_type,
128 .probe = &io_subchannel_probe,
129 .remove = &io_subchannel_remove,
130 .shutdown = &io_subchannel_shutdown,
132 .irq = io_subchannel_irq,
133 .notify = io_subchannel_notify,
134 .verify = io_subchannel_verify,
135 .termination = io_subchannel_ioterm,
138 struct workqueue_struct *ccw_device_work;
139 struct workqueue_struct *ccw_device_notify_work;
140 static wait_queue_head_t ccw_device_init_wq;
141 static atomic_t ccw_device_init_count;
144 init_ccw_bus_type (void)
148 init_waitqueue_head(&ccw_device_init_wq);
149 atomic_set(&ccw_device_init_count, 0);
151 ccw_device_work = create_singlethread_workqueue("cio");
152 if (!ccw_device_work)
153 return -ENOMEM; /* FIXME: better errno ? */
154 ccw_device_notify_work = create_singlethread_workqueue("cio_notify");
155 if (!ccw_device_notify_work) {
156 ret = -ENOMEM; /* FIXME: better errno ? */
159 slow_path_wq = create_singlethread_workqueue("kslowcrw");
161 ret = -ENOMEM; /* FIXME: better errno ? */
164 if ((ret = bus_register (&ccw_bus_type)))
167 if ((ret = driver_register(&io_subchannel_driver.drv)))
170 wait_event(ccw_device_init_wq,
171 atomic_read(&ccw_device_init_count) == 0);
172 flush_workqueue(ccw_device_work);
176 destroy_workqueue(ccw_device_work);
177 if (ccw_device_notify_work)
178 destroy_workqueue(ccw_device_notify_work);
180 destroy_workqueue(slow_path_wq);
185 cleanup_ccw_bus_type (void)
187 driver_unregister(&io_subchannel_driver.drv);
188 bus_unregister(&ccw_bus_type);
189 destroy_workqueue(ccw_device_notify_work);
190 destroy_workqueue(ccw_device_work);
193 subsys_initcall(init_ccw_bus_type);
194 module_exit(cleanup_ccw_bus_type);
196 /************************ device handling **************************/
199 * A ccw_device has some interfaces in sysfs in addition to the
201 * The following entries are designed to export the information which
202 * resided in 2.4 in /proc/subchannels. Subchannel and device number
203 * are obvious, so they don't have an entry :)
204 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
207 chpids_show (struct device * dev, char * buf)
209 struct subchannel *sch = to_subchannel(dev);
210 struct ssd_info *ssd = &sch->ssd_info;
214 for (chp = 0; chp < 8; chp++)
215 ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]);
217 ret += sprintf (buf+ret, "\n");
218 return min((ssize_t)PAGE_SIZE, ret);
222 pimpampom_show (struct device * dev, char * buf)
224 struct subchannel *sch = to_subchannel(dev);
225 struct pmcw *pmcw = &sch->schib.pmcw;
227 return sprintf (buf, "%02x %02x %02x\n",
228 pmcw->pim, pmcw->pam, pmcw->pom);
232 devtype_show (struct device *dev, char *buf)
234 struct ccw_device *cdev = to_ccwdev(dev);
235 struct ccw_device_id *id = &(cdev->id);
237 if (id->dev_type != 0)
238 return sprintf(buf, "%04x/%02x\n",
239 id->dev_type, id->dev_model);
241 return sprintf(buf, "n/a\n");
245 cutype_show (struct device *dev, char *buf)
247 struct ccw_device *cdev = to_ccwdev(dev);
248 struct ccw_device_id *id = &(cdev->id);
250 return sprintf(buf, "%04x/%02x\n",
251 id->cu_type, id->cu_model);
255 online_show (struct device *dev, char *buf)
257 struct ccw_device *cdev = to_ccwdev(dev);
259 return sprintf(buf, cdev->online ? "1\n" : "0\n");
263 ccw_device_remove_disconnected(struct ccw_device *cdev)
265 struct subchannel *sch;
267 * Forced offline in disconnected state means
268 * 'throw away device'.
270 sch = to_subchannel(cdev->dev.parent);
271 device_unregister(&sch->dev);
272 /* Reset intparm to zeroes. */
273 sch->schib.pmcw.intparm = 0;
275 put_device(&sch->dev);
279 ccw_device_set_offline(struct ccw_device *cdev)
285 if (!cdev->online || !cdev->drv)
288 if (cdev->drv->set_offline) {
289 ret = cdev->drv->set_offline(cdev);
294 spin_lock_irq(cdev->ccwlock);
295 ret = ccw_device_offline(cdev);
296 if (ret == -ENODEV) {
297 if (cdev->private->state != DEV_STATE_NOT_OPER) {
298 cdev->private->state = DEV_STATE_OFFLINE;
299 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
301 spin_unlock_irq(cdev->ccwlock);
304 spin_unlock_irq(cdev->ccwlock);
306 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
308 pr_debug("ccw_device_offline returned %d, device %s\n",
309 ret, cdev->dev.bus_id);
316 ccw_device_set_online(struct ccw_device *cdev)
322 if (cdev->online || !cdev->drv)
325 spin_lock_irq(cdev->ccwlock);
326 ret = ccw_device_online(cdev);
327 spin_unlock_irq(cdev->ccwlock);
329 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
331 pr_debug("ccw_device_online returned %d, device %s\n",
332 ret, cdev->dev.bus_id);
335 if (cdev->private->state != DEV_STATE_ONLINE)
337 if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) {
341 spin_lock_irq(cdev->ccwlock);
342 ret = ccw_device_offline(cdev);
343 spin_unlock_irq(cdev->ccwlock);
345 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
347 pr_debug("ccw_device_offline returned %d, device %s\n",
348 ret, cdev->dev.bus_id);
349 return (ret = 0) ? -ENODEV : ret;
353 online_store (struct device *dev, const char *buf, size_t count)
355 struct ccw_device *cdev = to_ccwdev(dev);
359 if (atomic_compare_and_swap(0, 1, &cdev->private->onoff))
362 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
363 atomic_set(&cdev->private->onoff, 0);
366 if (!strncmp(buf, "force\n", count)) {
371 i = simple_strtoul(buf, &tmp, 16);
374 /* Do device recognition, if needed. */
375 if (cdev->id.cu_type == 0) {
376 ret = ccw_device_recognition(cdev);
378 printk(KERN_WARNING"Couldn't start recognition "
379 "for device %s (ret=%d)\n",
380 cdev->dev.bus_id, ret);
383 wait_event(cdev->private->wait_q,
384 cdev->private->flags.recog_done);
386 if (cdev->drv && cdev->drv->set_online)
387 ccw_device_set_online(cdev);
389 if (cdev->private->state == DEV_STATE_DISCONNECTED)
390 ccw_device_remove_disconnected(cdev);
391 else if (cdev->drv && cdev->drv->set_offline)
392 ccw_device_set_offline(cdev);
394 if (force && cdev->private->state == DEV_STATE_BOXED) {
395 ret = ccw_device_stlck(cdev);
397 printk(KERN_WARNING"ccw_device_stlck for device %s "
398 "returned %d!\n", cdev->dev.bus_id, ret);
401 /* Do device recognition, if needed. */
402 if (cdev->id.cu_type == 0) {
403 cdev->private->state = DEV_STATE_NOT_OPER;
404 ret = ccw_device_recognition(cdev);
406 printk(KERN_WARNING"Couldn't start recognition "
407 "for device %s (ret=%d)\n",
408 cdev->dev.bus_id, ret);
411 wait_event(cdev->private->wait_q,
412 cdev->private->flags.recog_done);
414 if (cdev->drv && cdev->drv->set_online)
415 ccw_device_set_online(cdev);
419 module_put(cdev->drv->owner);
420 atomic_set(&cdev->private->onoff, 0);
425 available_show (struct device *dev, char *buf)
427 struct ccw_device *cdev = to_ccwdev(dev);
428 struct subchannel *sch;
430 switch (cdev->private->state) {
431 case DEV_STATE_BOXED:
432 return sprintf(buf, "boxed\n");
433 case DEV_STATE_DISCONNECTED:
434 case DEV_STATE_DISCONNECTED_SENSE_ID:
435 case DEV_STATE_NOT_OPER:
436 sch = to_subchannel(dev->parent);
438 return sprintf(buf, "no path\n");
440 return sprintf(buf, "no device\n");
442 /* All other states considered fine. */
443 return sprintf(buf, "good\n");
447 static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
448 static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
449 static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
450 static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
451 static DEVICE_ATTR(online, 0644, online_show, online_store);
452 extern struct device_attribute dev_attr_cmb_enable;
453 static DEVICE_ATTR(availability, 0444, available_show, NULL);
455 static struct attribute * subch_attrs[] = {
456 &dev_attr_chpids.attr,
457 &dev_attr_pimpampom.attr,
461 static struct attribute_group subch_attr_group = {
462 .attrs = subch_attrs,
466 subchannel_add_files (struct device *dev)
468 return sysfs_create_group(&dev->kobj, &subch_attr_group);
471 static struct attribute * ccwdev_attrs[] = {
472 &dev_attr_devtype.attr,
473 &dev_attr_cutype.attr,
474 &dev_attr_online.attr,
475 &dev_attr_cmb_enable.attr,
476 &dev_attr_availability.attr,
480 static struct attribute_group ccwdev_attr_group = {
481 .attrs = ccwdev_attrs,
485 device_add_files (struct device *dev)
487 return sysfs_create_group(&dev->kobj, &ccwdev_attr_group);
491 device_remove_files(struct device *dev)
493 sysfs_remove_group(&dev->kobj, &ccwdev_attr_group);
496 /* this is a simple abstraction for device_register that sets the
497 * correct bus type and adds the bus specific files */
499 ccw_device_register(struct ccw_device *cdev)
501 struct device *dev = &cdev->dev;
504 dev->bus = &ccw_bus_type;
506 if ((ret = device_add(dev)))
509 set_bit(1, &cdev->private->registered);
510 if ((ret = device_add_files(dev))) {
511 if (test_and_clear_bit(1, &cdev->private->registered))
517 static struct ccw_device *
518 get_disc_ccwdev_by_devno(unsigned int devno, struct ccw_device *sibling)
520 struct ccw_device *cdev;
521 struct list_head *entry;
524 if (!get_bus(&ccw_bus_type))
526 down_read(&ccw_bus_type.subsys.rwsem);
528 list_for_each(entry, &ccw_bus_type.devices.list) {
529 dev = get_device(container_of(entry,
530 struct device, bus_list));
533 cdev = to_ccwdev(dev);
534 if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
535 (cdev->private->devno == devno) &&
537 cdev->private->state = DEV_STATE_NOT_OPER;
543 up_read(&ccw_bus_type.subsys.rwsem);
544 put_bus(&ccw_bus_type);
550 ccw_device_add_changed(void *data)
553 struct ccw_device *cdev;
555 cdev = (struct ccw_device *)data;
556 if (device_add(&cdev->dev)) {
557 put_device(&cdev->dev);
560 set_bit(1, &cdev->private->registered);
561 if (device_add_files(&cdev->dev)) {
562 if (test_and_clear_bit(1, &cdev->private->registered))
563 device_unregister(&cdev->dev);
567 extern int css_get_ssd_info(struct subchannel *sch);
570 ccw_device_do_unreg_rereg(void *data)
572 struct ccw_device *cdev;
573 struct subchannel *sch;
576 cdev = (struct ccw_device *)data;
577 sch = to_subchannel(cdev->dev.parent);
578 if (cdev->private->devno != sch->schib.pmcw.dev) {
580 * The device number has changed. This is usually only when
581 * a device has been detached under VM and then re-appeared
582 * on another subchannel because of a different attachment
583 * order than before. Ideally, we should should just switch
584 * subchannels, but unfortunately, this is not possible with
585 * the current implementation.
586 * Instead, we search for the old subchannel for this device
587 * number and deregister so there are no collisions with the
588 * newly registered ccw_device.
589 * FIXME: Find another solution so the block layer doesn't
590 * get possibly sick...
592 struct ccw_device *other_cdev;
595 other_cdev = get_disc_ccwdev_by_devno(sch->schib.pmcw.dev,
598 struct subchannel *other_sch;
600 other_sch = to_subchannel(other_cdev->dev.parent);
601 if (get_device(&other_sch->dev)) {
602 stsch(other_sch->irq, &other_sch->schib);
603 if (other_sch->schib.pmcw.dnv) {
604 other_sch->schib.pmcw.intparm = 0;
605 cio_modify(other_sch);
607 device_unregister(&other_sch->dev);
610 /* Update ssd info here. */
611 css_get_ssd_info(sch);
612 cdev->private->devno = sch->schib.pmcw.dev;
615 device_remove_files(&cdev->dev);
616 if (test_and_clear_bit(1, &cdev->private->registered))
617 device_del(&cdev->dev);
619 snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.0.%04x",
620 sch->schib.pmcw.dev);
621 PREPARE_WORK(&cdev->private->kick_work,
622 ccw_device_add_changed, (void *)cdev);
623 queue_work(ccw_device_work, &cdev->private->kick_work);
627 ccw_device_release(struct device *dev)
629 struct ccw_device *cdev;
631 cdev = to_ccwdev(dev);
632 kfree(cdev->private);
637 * Register recognized device.
640 io_subchannel_register(void *data)
642 struct ccw_device *cdev;
643 struct subchannel *sch;
647 cdev = (struct ccw_device *) data;
648 sch = to_subchannel(cdev->dev.parent);
650 if (!list_empty(&sch->dev.children)) {
651 bus_rescan_devices(&ccw_bus_type);
654 /* make it known to the system */
655 ret = ccw_device_register(cdev);
657 printk (KERN_WARNING "%s: could not register %s\n",
658 __func__, cdev->dev.bus_id);
659 put_device(&cdev->dev);
660 spin_lock_irqsave(&sch->lock, flags);
661 sch->dev.driver_data = NULL;
662 spin_unlock_irqrestore(&sch->lock, flags);
663 kfree (cdev->private);
665 put_device(&sch->dev);
666 if (atomic_dec_and_test(&ccw_device_init_count))
667 wake_up(&ccw_device_init_wq);
671 ret = subchannel_add_files(cdev->dev.parent);
673 printk(KERN_WARNING "%s: could not add attributes to %s\n",
674 __func__, sch->dev.bus_id);
675 put_device(&cdev->dev);
677 cdev->private->flags.recog_done = 1;
678 put_device(&sch->dev);
679 wake_up(&cdev->private->wait_q);
680 if (atomic_dec_and_test(&ccw_device_init_count))
681 wake_up(&ccw_device_init_wq);
685 ccw_device_call_sch_unregister(void *data)
687 struct ccw_device *cdev = data;
688 struct subchannel *sch;
690 sch = to_subchannel(cdev->dev.parent);
691 device_unregister(&sch->dev);
692 /* Reset intparm to zeroes. */
693 sch->schib.pmcw.intparm = 0;
695 put_device(&cdev->dev);
696 put_device(&sch->dev);
700 * subchannel recognition done. Called from the state machine.
703 io_subchannel_recog_done(struct ccw_device *cdev)
705 struct subchannel *sch;
707 if (css_init_done == 0) {
708 cdev->private->flags.recog_done = 1;
711 switch (cdev->private->state) {
712 case DEV_STATE_NOT_OPER:
713 cdev->private->flags.recog_done = 1;
714 /* Remove device found not operational. */
715 if (!get_device(&cdev->dev))
717 sch = to_subchannel(cdev->dev.parent);
718 PREPARE_WORK(&cdev->private->kick_work,
719 ccw_device_call_sch_unregister, (void *) cdev);
720 queue_work(slow_path_wq, &cdev->private->kick_work);
721 if (atomic_dec_and_test(&ccw_device_init_count))
722 wake_up(&ccw_device_init_wq);
724 case DEV_STATE_BOXED:
725 /* Device did not respond in time. */
726 case DEV_STATE_OFFLINE:
728 * We can't register the device in interrupt context so
729 * we schedule a work item.
731 if (!get_device(&cdev->dev))
733 PREPARE_WORK(&cdev->private->kick_work,
734 io_subchannel_register, (void *) cdev);
735 queue_work(slow_path_wq, &cdev->private->kick_work);
741 io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
744 struct ccw_device_private *priv;
746 sch->dev.driver_data = cdev;
747 sch->driver = &io_subchannel_driver;
748 cdev->ccwlock = &sch->lock;
749 /* Init private data. */
750 priv = cdev->private;
751 priv->devno = sch->schib.pmcw.dev;
752 priv->irq = sch->irq;
753 priv->state = DEV_STATE_NOT_OPER;
754 INIT_LIST_HEAD(&priv->cmb_list);
755 init_waitqueue_head(&priv->wait_q);
756 init_timer(&priv->timer);
758 /* Set an initial name for the device. */
759 snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.0.%04x",
760 sch->schib.pmcw.dev);
762 /* Increase counter of devices currently in recognition. */
763 atomic_inc(&ccw_device_init_count);
765 /* Start async. device sensing. */
766 spin_lock_irq(&sch->lock);
767 rc = ccw_device_recognition(cdev);
768 spin_unlock_irq(&sch->lock);
770 if (atomic_dec_and_test(&ccw_device_init_count))
771 wake_up(&ccw_device_init_wq);
777 io_subchannel_probe (struct device *pdev)
779 struct subchannel *sch;
780 struct ccw_device *cdev;
784 sch = to_subchannel(pdev);
785 if (sch->dev.driver_data) {
787 * This subchannel already has an associated ccw_device.
788 * Register it and exit. This happens for all early
789 * device, e.g. the console.
791 cdev = sch->dev.driver_data;
792 device_initialize(&cdev->dev);
793 ccw_device_register(cdev);
794 subchannel_add_files(&sch->dev);
796 * Check if the device is already online. If it is
797 * the reference count needs to be corrected
798 * (see ccw_device_online and css_init_done for the
801 if (cdev->private->state != DEV_STATE_NOT_OPER &&
802 cdev->private->state != DEV_STATE_OFFLINE &&
803 cdev->private->state != DEV_STATE_BOXED)
804 get_device(&cdev->dev);
807 cdev = kmalloc (sizeof(*cdev), GFP_KERNEL);
810 memset(cdev, 0, sizeof(struct ccw_device));
811 cdev->private = kmalloc(sizeof(struct ccw_device_private),
812 GFP_KERNEL | GFP_DMA);
813 if (!cdev->private) {
817 memset(cdev->private, 0, sizeof(struct ccw_device_private));
818 atomic_set(&cdev->private->onoff, 0);
819 cdev->dev = (struct device) {
821 .release = ccw_device_release,
823 INIT_LIST_HEAD(&cdev->private->kick_work.entry);
824 /* Do first half of device_register. */
825 device_initialize(&cdev->dev);
827 if (!get_device(&sch->dev)) {
828 if (cdev->dev.release)
829 cdev->dev.release(&cdev->dev);
833 rc = io_subchannel_recog(cdev, to_subchannel(pdev));
835 spin_lock_irqsave(&sch->lock, flags);
836 sch->dev.driver_data = NULL;
837 spin_unlock_irqrestore(&sch->lock, flags);
838 if (cdev->dev.release)
839 cdev->dev.release(&cdev->dev);
846 ccw_device_unregister(void *data)
848 struct ccw_device *cdev;
850 cdev = (struct ccw_device *)data;
851 if (test_and_clear_bit(1, &cdev->private->registered))
852 device_unregister(&cdev->dev);
853 put_device(&cdev->dev);
857 io_subchannel_remove (struct device *dev)
859 struct ccw_device *cdev;
862 if (!dev->driver_data)
864 cdev = dev->driver_data;
865 /* Set ccw device to not operational and drop reference. */
866 spin_lock_irqsave(cdev->ccwlock, flags);
867 dev->driver_data = NULL;
868 cdev->private->state = DEV_STATE_NOT_OPER;
869 spin_unlock_irqrestore(cdev->ccwlock, flags);
871 * Put unregistration on workqueue to avoid livelocks on the css bus
874 if (get_device(&cdev->dev)) {
875 PREPARE_WORK(&cdev->private->kick_work,
876 ccw_device_unregister, (void *) cdev);
877 queue_work(ccw_device_work, &cdev->private->kick_work);
883 io_subchannel_notify(struct device *dev, int event)
885 struct ccw_device *cdev;
887 cdev = dev->driver_data;
894 return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
898 io_subchannel_verify(struct device *dev)
900 struct ccw_device *cdev;
902 cdev = dev->driver_data;
904 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
908 io_subchannel_ioterm(struct device *dev)
910 struct ccw_device *cdev;
912 cdev = dev->driver_data;
915 cdev->private->state = DEV_STATE_CLEAR_VERIFY;
917 cdev->handler(cdev, cdev->private->intparm,
922 io_subchannel_shutdown(struct device *dev)
924 struct subchannel *sch;
925 struct ccw_device *cdev;
928 sch = to_subchannel(dev);
929 cdev = dev->driver_data;
931 if (cio_is_console(sch->irq))
933 if (!sch->schib.pmcw.ena)
936 ret = cio_disable_subchannel(sch);
938 /* Subchannel is disabled, we're done. */
940 cdev->private->state = DEV_STATE_QUIESCE;
942 cdev->handler(cdev, cdev->private->intparm,
944 ret = ccw_device_cancel_halt_clear(cdev);
946 ccw_device_set_timeout(cdev, HZ/10);
947 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
949 cio_disable_subchannel(sch);
952 #ifdef CONFIG_CCW_CONSOLE
953 static struct ccw_device console_cdev;
954 static struct ccw_device_private console_private;
955 static int console_cdev_in_use;
958 ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch)
962 /* Initialize the ccw_device structure. */
963 cdev->dev = (struct device) {
966 /* Initialize the subchannel structure */
967 sch->dev.parent = &css_bus_device;
968 sch->dev.bus = &css_bus_type;
970 rc = io_subchannel_recog(cdev, sch);
974 /* Now wait for the async. recognition to come to an end. */
975 spin_lock_irq(cdev->ccwlock);
976 while (!dev_fsm_final_state(cdev))
979 if (cdev->private->state != DEV_STATE_OFFLINE)
981 ccw_device_online(cdev);
982 while (!dev_fsm_final_state(cdev))
984 if (cdev->private->state != DEV_STATE_ONLINE)
988 spin_unlock_irq(cdev->ccwlock);
993 ccw_device_probe_console(void)
995 struct subchannel *sch;
998 if (xchg(&console_cdev_in_use, 1) != 0)
1000 sch = cio_probe_console();
1002 console_cdev_in_use = 0;
1003 return (void *) sch;
1005 memset(&console_cdev, 0, sizeof(struct ccw_device));
1006 memset(&console_private, 0, sizeof(struct ccw_device_private));
1007 console_cdev.private = &console_private;
1008 ret = ccw_device_console_enable(&console_cdev, sch);
1010 cio_release_console();
1011 console_cdev_in_use = 0;
1012 return ERR_PTR(ret);
1014 console_cdev.online = 1;
1015 return &console_cdev;
1020 * get ccw_device matching the busid, but only if owned by cdrv
1023 get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id)
1025 struct device *d, *dev;
1026 struct device_driver *drv;
1028 drv = get_driver(&cdrv->driver);
1032 down_read(&drv->bus->subsys.rwsem);
1035 list_for_each_entry(d, &drv->devices, driver_list) {
1036 dev = get_device(d);
1038 if (dev && !strncmp(bus_id, dev->bus_id, BUS_ID_SIZE))
1045 up_read(&drv->bus->subsys.rwsem);
1048 return dev ? to_ccwdev(dev) : 0;
1051 /************************** device driver handling ************************/
1053 /* This is the implementation of the ccw_driver class. The probe, remove
1054 * and release methods are initially very similar to the device_driver
1055 * implementations, with the difference that they have ccw_device
1058 * A ccw driver also contains the information that is needed for
1062 ccw_device_probe (struct device *dev)
1064 struct ccw_device *cdev = to_ccwdev(dev);
1065 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1068 cdev->drv = cdrv; /* to let the driver call _set_online */
1070 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1081 ccw_device_remove (struct device *dev)
1083 struct ccw_device *cdev = to_ccwdev(dev);
1084 struct ccw_driver *cdrv = cdev->drv;
1087 pr_debug("removing device %s\n", cdev->dev.bus_id);
1092 spin_lock_irq(cdev->ccwlock);
1093 ret = ccw_device_offline(cdev);
1094 spin_unlock_irq(cdev->ccwlock);
1096 wait_event(cdev->private->wait_q,
1097 dev_fsm_final_state(cdev));
1099 //FIXME: we can't fail!
1100 pr_debug("ccw_device_offline returned %d, device %s\n",
1101 ret, cdev->dev.bus_id);
1103 ccw_device_set_timeout(cdev, 0);
1109 ccw_driver_register (struct ccw_driver *cdriver)
1111 struct device_driver *drv = &cdriver->driver;
1113 drv->bus = &ccw_bus_type;
1114 drv->name = cdriver->name;
1115 drv->probe = ccw_device_probe;
1116 drv->remove = ccw_device_remove;
1118 return driver_register(drv);
1122 ccw_driver_unregister (struct ccw_driver *cdriver)
1124 driver_unregister(&cdriver->driver);
1127 MODULE_LICENSE("GPL");
1128 EXPORT_SYMBOL(ccw_device_set_online);
1129 EXPORT_SYMBOL(ccw_device_set_offline);
1130 EXPORT_SYMBOL(ccw_driver_register);
1131 EXPORT_SYMBOL(ccw_driver_unregister);
1132 EXPORT_SYMBOL(get_ccwdev_by_busid);
1133 EXPORT_SYMBOL(ccw_bus_type);
1134 EXPORT_SYMBOL(ccw_device_work);
1135 EXPORT_SYMBOL(ccw_device_notify_work);