[linux-2.6-block.git] / drivers / s390 / cio / eadm_sch.c

/*
 * Driver for s390 eadm subchannels
 *
 * Copyright IBM Corp. 2012
 * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
 */

#include <linux/kernel_stat.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/list.h>

#include <asm/css_chars.h>
#include <asm/debug.h>
#include <asm/isc.h>
#include <asm/cio.h>
#include <asm/scsw.h>
#include <asm/eadm.h>

#include "eadm_sch.h"
#include "ioasm.h"
#include "cio.h"
#include "css.h"
#include "orb.h"

MODULE_DESCRIPTION("driver for s390 eadm subchannels");
MODULE_LICENSE("GPL");

#define EADM_TIMEOUT (7 * HZ)
static DEFINE_SPINLOCK(list_lock);
static LIST_HEAD(eadm_list);

static debug_info_t *eadm_debug;

#define EADM_LOG(imp, txt) do {					\
		debug_text_event(eadm_debug, imp, txt);		\
	} while (0)

static void EADM_LOG_HEX(int level, void *data, int length)
{
	if (!debug_level_enabled(eadm_debug, level))
		return;
	while (length > 0) {
		debug_event(eadm_debug, level, data, length);
		length -= eadm_debug->buf_size;
		data += eadm_debug->buf_size;
	}
}

static void orb_init(union orb *orb)
{
	memset(orb, 0, sizeof(union orb));
	orb->eadm.compat1 = 1;
	orb->eadm.compat2 = 1;
	orb->eadm.fmt = 1;
	orb->eadm.x = 1;
}

static int eadm_subchannel_start(struct subchannel *sch, struct aob *aob)
{
	union orb *orb = &get_eadm_private(sch)->orb;
	int cc;

	orb_init(orb);
	orb->eadm.aob = (u32)__pa(aob);
	orb->eadm.intparm = (u32)(addr_t)sch;
	orb->eadm.key = PAGE_DEFAULT_KEY >> 4;

	EADM_LOG(6, "start");
	EADM_LOG_HEX(6, &sch->schid, sizeof(sch->schid));

	cc = ssch(sch->schid, orb);
	switch (cc) {
	case 0:
		sch->schib.scsw.eadm.actl |= SCSW_ACTL_START_PEND;
		break;
	case 1:		/* status pending */
	case 2:		/* busy */
		return -EBUSY;
	case 3:		/* not operational */
		return -ENODEV;
	}
	return 0;
}

static int eadm_subchannel_clear(struct subchannel *sch)
{
	int cc;

	cc = csch(sch->schid);
	if (cc)
		return -ENODEV;

	sch->schib.scsw.eadm.actl |= SCSW_ACTL_CLEAR_PEND;
	return 0;
}

static void eadm_subchannel_timeout(unsigned long data)
{
	struct subchannel *sch = (struct subchannel *) data;

	spin_lock_irq(sch->lock);
	EADM_LOG(1, "timeout");
	EADM_LOG_HEX(1, &sch->schid, sizeof(sch->schid));
	if (eadm_subchannel_clear(sch))
		EADM_LOG(0, "clear failed");
	spin_unlock_irq(sch->lock);
}

static void eadm_subchannel_set_timeout(struct subchannel *sch, int expires)
{
	struct eadm_private *private = get_eadm_private(sch);

	if (expires == 0) {
		del_timer(&private->timer);
		return;
	}
	if (timer_pending(&private->timer)) {
		if (mod_timer(&private->timer, jiffies + expires))
			return;
	}
	private->timer.function = eadm_subchannel_timeout;
	private->timer.data = (unsigned long) sch;
	private->timer.expires = jiffies + expires;
	add_timer(&private->timer);
}

static void eadm_subchannel_irq(struct subchannel *sch)
{
	struct eadm_private *private = get_eadm_private(sch);
	struct eadm_scsw *scsw = &sch->schib.scsw.eadm;
	struct irb *irb = this_cpu_ptr(&cio_irb);
	int error = 0;

	EADM_LOG(6, "irq");
	EADM_LOG_HEX(6, irb, sizeof(*irb));

	inc_irq_stat(IRQIO_ADM);

	if ((scsw->stctl & (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))
	    && scsw->eswf == 1 && irb->esw.eadm.erw.r)
		error = -EIO;

	if (scsw->fctl & SCSW_FCTL_CLEAR_FUNC)
		error = -ETIMEDOUT;

	eadm_subchannel_set_timeout(sch, 0);

	if (private->state != EADM_BUSY) {
		EADM_LOG(1, "irq unsol");
		EADM_LOG_HEX(1, irb, sizeof(*irb));
		private->state = EADM_NOT_OPER;
		css_sched_sch_todo(sch, SCH_TODO_EVAL);
		return;
	}
	scm_irq_handler((struct aob *)(unsigned long)scsw->aob, error);
	private->state = EADM_IDLE;

	if (private->completion)
		complete(private->completion);
}

static struct subchannel *eadm_get_idle_sch(void)
{
	struct eadm_private *private;
	struct subchannel *sch;
	unsigned long flags;

	spin_lock_irqsave(&list_lock, flags);
	list_for_each_entry(private, &eadm_list, head) {
		sch = private->sch;
		spin_lock(sch->lock);
		if (private->state == EADM_IDLE) {
			private->state = EADM_BUSY;
			list_move_tail(&private->head, &eadm_list);
			spin_unlock(sch->lock);
			spin_unlock_irqrestore(&list_lock, flags);

			return sch;
		}
		spin_unlock(sch->lock);
	}
	spin_unlock_irqrestore(&list_lock, flags);

	return NULL;
}

int eadm_start_aob(struct aob *aob)
{
	struct eadm_private *private;
	struct subchannel *sch;
	unsigned long flags;
	int ret;

	sch = eadm_get_idle_sch();
	if (!sch)
		return -EBUSY;

	spin_lock_irqsave(sch->lock, flags);
	eadm_subchannel_set_timeout(sch, EADM_TIMEOUT);
	ret = eadm_subchannel_start(sch, aob);
	if (!ret)
		goto out_unlock;

	/* Handle start subchannel failure. */
	eadm_subchannel_set_timeout(sch, 0);
	private = get_eadm_private(sch);
	private->state = EADM_NOT_OPER;
	css_sched_sch_todo(sch, SCH_TODO_EVAL);

out_unlock:
	spin_unlock_irqrestore(sch->lock, flags);

	return ret;
}
EXPORT_SYMBOL_GPL(eadm_start_aob);

static int eadm_subchannel_probe(struct subchannel *sch)
{
	struct eadm_private *private;
	int ret;

	private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
	if (!private)
		return -ENOMEM;

	INIT_LIST_HEAD(&private->head);
	init_timer(&private->timer);

	spin_lock_irq(sch->lock);
	set_eadm_private(sch, private);
	private->state = EADM_IDLE;
	private->sch = sch;
	sch->isc = EADM_SCH_ISC;
	ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
	if (ret) {
		set_eadm_private(sch, NULL);
		spin_unlock_irq(sch->lock);
		kfree(private);
		goto out;
	}
	spin_unlock_irq(sch->lock);

	spin_lock_irq(&list_lock);
	list_add(&private->head, &eadm_list);
	spin_unlock_irq(&list_lock);

	if (dev_get_uevent_suppress(&sch->dev)) {
		dev_set_uevent_suppress(&sch->dev, 0);
		kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
	}
out:
	return ret;
}

static void eadm_quiesce(struct subchannel *sch)
{
	struct eadm_private *private = get_eadm_private(sch);
	DECLARE_COMPLETION_ONSTACK(completion);
	int ret;

	spin_lock_irq(sch->lock);
	if (private->state != EADM_BUSY)
		goto disable;

	if (eadm_subchannel_clear(sch))
		goto disable;

	private->completion = &completion;
	spin_unlock_irq(sch->lock);

	wait_for_completion_io(&completion);

	spin_lock_irq(sch->lock);
	private->completion = NULL;

disable:
	eadm_subchannel_set_timeout(sch, 0);
	do {
		ret = cio_disable_subchannel(sch);
	} while (ret == -EBUSY);

	spin_unlock_irq(sch->lock);
}

static int eadm_subchannel_remove(struct subchannel *sch)
{
	struct eadm_private *private = get_eadm_private(sch);

	spin_lock_irq(&list_lock);
	list_del(&private->head);
	spin_unlock_irq(&list_lock);

	eadm_quiesce(sch);

	spin_lock_irq(sch->lock);
	set_eadm_private(sch, NULL);
	spin_unlock_irq(sch->lock);

	kfree(private);

	return 0;
}

static void eadm_subchannel_shutdown(struct subchannel *sch)
{
	eadm_quiesce(sch);
}

static int eadm_subchannel_freeze(struct subchannel *sch)
{
	return cio_disable_subchannel(sch);
}

static int eadm_subchannel_restore(struct subchannel *sch)
{
	return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
}

/**
 * eadm_subchannel_sch_event - process subchannel event
 * @sch: subchannel
 * @process: non-zero if function is called in process context
 *
 * An unspecified event occurred for this subchannel. Adjust data according
 * to the current operational state of the subchannel. Return zero when the
 * event has been handled sufficiently or -EAGAIN when this function should
 * be called again in process context.
 */
static int eadm_subchannel_sch_event(struct subchannel *sch, int process)
{
	struct eadm_private *private;
	unsigned long flags;
	int ret = 0;

	spin_lock_irqsave(sch->lock, flags);
	if (!device_is_registered(&sch->dev))
		goto out_unlock;

	if (work_pending(&sch->todo_work))
		goto out_unlock;

	if (cio_update_schib(sch)) {
		css_sched_sch_todo(sch, SCH_TODO_UNREG);
		goto out_unlock;
	}
	private = get_eadm_private(sch);
	if (private->state == EADM_NOT_OPER)
		private->state = EADM_IDLE;

out_unlock:
	spin_unlock_irqrestore(sch->lock, flags);

	return ret;
}

static struct css_device_id eadm_subchannel_ids[] = {
	{ .match_flags = 0x1, .type = SUBCHANNEL_TYPE_ADM, },
	{ /* end of list */ },
};
MODULE_DEVICE_TABLE(css, eadm_subchannel_ids);

static struct css_driver eadm_subchannel_driver = {
	.drv = {
		.name = "eadm_subchannel",
		.owner = THIS_MODULE,
	},
	.subchannel_type = eadm_subchannel_ids,
	.irq = eadm_subchannel_irq,
	.probe = eadm_subchannel_probe,
	.remove = eadm_subchannel_remove,
	.shutdown = eadm_subchannel_shutdown,
	.sch_event = eadm_subchannel_sch_event,
	.freeze = eadm_subchannel_freeze,
	.thaw = eadm_subchannel_restore,
	.restore = eadm_subchannel_restore,
};

static int __init eadm_sch_init(void)
{
	int ret;

	if (!css_general_characteristics.eadm)
		return -ENXIO;

	eadm_debug = debug_register("eadm_log", 16, 1, 16);
	if (!eadm_debug)
		return -ENOMEM;

	debug_register_view(eadm_debug, &debug_hex_ascii_view);
	debug_set_level(eadm_debug, 2);

	isc_register(EADM_SCH_ISC);
	ret = css_driver_register(&eadm_subchannel_driver);
	if (ret)
		goto cleanup;

	return ret;

cleanup:
	isc_unregister(EADM_SCH_ISC);
	debug_unregister(eadm_debug);
	return ret;
}

static void __exit eadm_sch_exit(void)
{
	css_driver_unregister(&eadm_subchannel_driver);
	isc_unregister(EADM_SCH_ISC);
	debug_unregister(eadm_debug);
}
module_init(eadm_sch_init);
module_exit(eadm_sch_exit);
Commit	Line	Data
eadb86ab SO	1	/*
	2	* Driver for s390 eadm subchannels
	3	*
	4	* Copyright IBM Corp. 2012
	5	* Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
	6	*/
	7
2e73c2cf	8	#include <linux/kernel_stat.h>
6aa2677a	9	#include <linux/completion.h>
eadb86ab SO	10	#include <linux/workqueue.h>
	11	#include <linux/spinlock.h>
	12	#include <linux/device.h>
	13	#include <linux/module.h>
	14	#include <linux/timer.h>
	15	#include <linux/slab.h>
	16	#include <linux/list.h>
	17
	18	#include <asm/css_chars.h>
	19	#include <asm/debug.h>
	20	#include <asm/isc.h>
	21	#include <asm/cio.h>
	22	#include <asm/scsw.h>
	23	#include <asm/eadm.h>
	24
	25	#include "eadm_sch.h"
	26	#include "ioasm.h"
	27	#include "cio.h"
	28	#include "css.h"
	29	#include "orb.h"
	30
	31	MODULE_DESCRIPTION("driver for s390 eadm subchannels");
	32	MODULE_LICENSE("GPL");
	33
e2578b82	34	#define EADM_TIMEOUT (7 * HZ)
eadb86ab SO	35	static DEFINE_SPINLOCK(list_lock);
	36	static LIST_HEAD(eadm_list);
	37
	38	static debug_info_t *eadm_debug;
	39
	40	#define EADM_LOG(imp, txt) do { \
	41	debug_text_event(eadm_debug, imp, txt); \
	42	} while (0)
	43
	44	static void EADM_LOG_HEX(int level, void *data, int length)
	45	{
8e6a8285	46	if (!debug_level_enabled(eadm_debug, level))
eadb86ab SO	47	return;
	48	while (length > 0) {
	49	debug_event(eadm_debug, level, data, length);
	50	length -= eadm_debug->buf_size;
	51	data += eadm_debug->buf_size;
	52	}
	53	}
	54
	55	static void orb_init(union orb *orb)
	56	{
	57	memset(orb, 0, sizeof(union orb));
	58	orb->eadm.compat1 = 1;
	59	orb->eadm.compat2 = 1;
	60	orb->eadm.fmt = 1;
	61	orb->eadm.x = 1;
	62	}
	63
	64	static int eadm_subchannel_start(struct subchannel sch, struct aob aob)
	65	{
	66	union orb *orb = &get_eadm_private(sch)->orb;
	67	int cc;
	68
	69	orb_init(orb);
	70	orb->eadm.aob = (u32)__pa(aob);
	71	orb->eadm.intparm = (u32)(addr_t)sch;
	72	orb->eadm.key = PAGE_DEFAULT_KEY >> 4;
	73
	74	EADM_LOG(6, "start");
	75	EADM_LOG_HEX(6, &sch->schid, sizeof(sch->schid));
	76
	77	cc = ssch(sch->schid, orb);
	78	switch (cc) {
	79	case 0:
	80	sch->schib.scsw.eadm.actl \|= SCSW_ACTL_START_PEND;
	81	break;
	82	case 1: /* status pending */
	83	case 2: /* busy */
	84	return -EBUSY;
	85	case 3: /* not operational */
	86	return -ENODEV;
	87	}
	88	return 0;
	89	}
	90
	91	static int eadm_subchannel_clear(struct subchannel *sch)
	92	{
	93	int cc;
	94
	95	cc = csch(sch->schid);
	96	if (cc)
	97	return -ENODEV;
	98
	99	sch->schib.scsw.eadm.actl \|= SCSW_ACTL_CLEAR_PEND;
	100	return 0;
	101	}
	102
	103	static void eadm_subchannel_timeout(unsigned long data)
	104	{
	105	struct subchannel sch = (struct subchannel ) data;
	106
	107	spin_lock_irq(sch->lock);
	108	EADM_LOG(1, "timeout");
	109	EADM_LOG_HEX(1, &sch->schid, sizeof(sch->schid));
	110	if (eadm_subchannel_clear(sch))
111	EADM_LOG(0, "clear failed");
112	spin_unlock_irq(sch->lock);
113	}
114
115	static void eadm_subchannel_set_timeout(struct subchannel *sch, int expires)
116	{
117	struct eadm_private *private = get_eadm_private(sch);
118
119	if (expires == 0) {
120	del_timer(&private->timer);
121	return;
122	}
123	if (timer_pending(&private->timer)) {
124	if (mod_timer(&private->timer, jiffies + expires))
125	return;
126	}
127	private->timer.function = eadm_subchannel_timeout;
128	private->timer.data = (unsigned long) sch;
129	private->timer.expires = jiffies + expires;
130	add_timer(&private->timer);
131	}
132
133	static void eadm_subchannel_irq(struct subchannel *sch)
134	{
135	struct eadm_private *private = get_eadm_private(sch);
136	struct eadm_scsw *scsw = &sch->schib.scsw.eadm;
0bf7fcf1	137	struct irb *irb = this_cpu_ptr(&cio_irb);
eadb86ab SO	138	int error = 0;
	139
	140	EADM_LOG(6, "irq");
	141	EADM_LOG_HEX(6, irb, sizeof(*irb));
	142
420f42ec	143	inc_irq_stat(IRQIO_ADM);
2e73c2cf	144
eadb86ab SO	145	if ((scsw->stctl & (SCSW_STCTL_ALERT_STATUS \| SCSW_STCTL_STATUS_PEND))
	146	&& scsw->eswf == 1 && irb->esw.eadm.erw.r)
	147	error = -EIO;
	148
	149	if (scsw->fctl & SCSW_FCTL_CLEAR_FUNC)
	150	error = -ETIMEDOUT;
	151
	152	eadm_subchannel_set_timeout(sch, 0);
	153
	154	if (private->state != EADM_BUSY) {
	155	EADM_LOG(1, "irq unsol");
	156	EADM_LOG_HEX(1, irb, sizeof(*irb));
	157	private->state = EADM_NOT_OPER;
	158	css_sched_sch_todo(sch, SCH_TODO_EVAL);
	159	return;
	160	}
	161	scm_irq_handler((struct aob *)(unsigned long)scsw->aob, error);
	162	private->state = EADM_IDLE;
6aa2677a SO	163
	164	if (private->completion)
	165	complete(private->completion);
eadb86ab SO	166	}
	167
	168	static struct subchannel *eadm_get_idle_sch(void)
	169	{
	170	struct eadm_private *private;
	171	struct subchannel *sch;
	172	unsigned long flags;
	173
	174	spin_lock_irqsave(&list_lock, flags);
	175	list_for_each_entry(private, &eadm_list, head) {
	176	sch = private->sch;
	177	spin_lock(sch->lock);
	178	if (private->state == EADM_IDLE) {
	179	private->state = EADM_BUSY;
	180	list_move_tail(&private->head, &eadm_list);
	181	spin_unlock(sch->lock);
	182	spin_unlock_irqrestore(&list_lock, flags);
	183
	184	return sch;
	185	}
	186	spin_unlock(sch->lock);
	187	}
	188	spin_unlock_irqrestore(&list_lock, flags);
	189
	190	return NULL;
	191	}
	192
605c3698	193	int eadm_start_aob(struct aob *aob)
eadb86ab SO	194	{
	195	struct eadm_private *private;
	196	struct subchannel *sch;
	197	unsigned long flags;
	198	int ret;
	199
	200	sch = eadm_get_idle_sch();
	201	if (!sch)
	202	return -EBUSY;
	203
	204	spin_lock_irqsave(sch->lock, flags);
	205	eadm_subchannel_set_timeout(sch, EADM_TIMEOUT);
	206	ret = eadm_subchannel_start(sch, aob);
	207	if (!ret)
	208	goto out_unlock;
	209
	210	/* Handle start subchannel failure. */
	211	eadm_subchannel_set_timeout(sch, 0);
	212	private = get_eadm_private(sch);
	213	private->state = EADM_NOT_OPER;
	214	css_sched_sch_todo(sch, SCH_TODO_EVAL);
	215
	216	out_unlock:
	217	spin_unlock_irqrestore(sch->lock, flags);
	218
	219	return ret;
	220	}
605c3698	221	EXPORT_SYMBOL_GPL(eadm_start_aob);
eadb86ab SO	222
	223	static int eadm_subchannel_probe(struct subchannel *sch)
	224	{
	225	struct eadm_private *private;
	226	int ret;
	227
	228	private = kzalloc(sizeof(*private), GFP_KERNEL \| GFP_DMA);
	229	if (!private)
	230	return -ENOMEM;
	231
	232	INIT_LIST_HEAD(&private->head);
	233	init_timer(&private->timer);
	234
	235	spin_lock_irq(sch->lock);
	236	set_eadm_private(sch, private);
	237	private->state = EADM_IDLE;
	238	private->sch = sch;
	239	sch->isc = EADM_SCH_ISC;
	240	ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
	241	if (ret) {
	242	set_eadm_private(sch, NULL);
	243	spin_unlock_irq(sch->lock);
	244	kfree(private);
	245	goto out;
	246	}
	247	spin_unlock_irq(sch->lock);
	248
	249	spin_lock_irq(&list_lock);
	250	list_add(&private->head, &eadm_list);
	251	spin_unlock_irq(&list_lock);
	252
	253	if (dev_get_uevent_suppress(&sch->dev)) {
	254	dev_set_uevent_suppress(&sch->dev, 0);
	255	kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
	256	}
	257	out:
	258	return ret;
	259	}
	260
	261	static void eadm_quiesce(struct subchannel *sch)
	262	{
6aa2677a SO	263	struct eadm_private *private = get_eadm_private(sch);
6aa2677a SO	264	DECLARE_COMPLETION_ONSTACK(completion);
eadb86ab SO	265	int ret;
eadb86ab SO	266
6aa2677a SO	267	spin_lock_irq(sch->lock);
	268	if (private->state != EADM_BUSY)
	269	goto disable;
	270
	271	if (eadm_subchannel_clear(sch))
	272	goto disable;
	273
	274	private->completion = &completion;
	275	spin_unlock_irq(sch->lock);
	276
	277	wait_for_completion_io(&completion);
	278
	279	spin_lock_irq(sch->lock);
	280	private->completion = NULL;
	281
	282	disable:
	283	eadm_subchannel_set_timeout(sch, 0);
eadb86ab	284	do {
eadb86ab	285	ret = cio_disable_subchannel(sch);
eadb86ab	286	} while (ret == -EBUSY);
6aa2677a SO	287
6aa2677a SO	288	spin_unlock_irq(sch->lock);
eadb86ab SO	289	}
	290
	291	static int eadm_subchannel_remove(struct subchannel *sch)
	292	{
	293	struct eadm_private *private = get_eadm_private(sch);
	294
	295	spin_lock_irq(&list_lock);
	296	list_del(&private->head);
	297	spin_unlock_irq(&list_lock);
	298
	299	eadm_quiesce(sch);
	300
	301	spin_lock_irq(sch->lock);
	302	set_eadm_private(sch, NULL);
	303	spin_unlock_irq(sch->lock);
	304
	305	kfree(private);
	306
	307	return 0;
	308	}
	309
	310	static void eadm_subchannel_shutdown(struct subchannel *sch)
	311	{
	312	eadm_quiesce(sch);
	313	}
	314
	315	static int eadm_subchannel_freeze(struct subchannel *sch)
	316	{
	317	return cio_disable_subchannel(sch);
	318	}
	319
	320	static int eadm_subchannel_restore(struct subchannel *sch)
	321	{
	322	return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
	323	}
	324
	325	/**
	326	* eadm_subchannel_sch_event - process subchannel event
	327	* @sch: subchannel
	328	* @process: non-zero if function is called in process context
	329	*
	330	* An unspecified event occurred for this subchannel. Adjust data according
	331	* to the current operational state of the subchannel. Return zero when the
	332	* event has been handled sufficiently or -EAGAIN when this function should
	333	* be called again in process context.
	334	*/
	335	static int eadm_subchannel_sch_event(struct subchannel *sch, int process)
	336	{
	337	struct eadm_private *private;
	338	unsigned long flags;
	339	int ret = 0;
	340
	341	spin_lock_irqsave(sch->lock, flags);
	342	if (!device_is_registered(&sch->dev))
	343	goto out_unlock;
	344
	345	if (work_pending(&sch->todo_work))
	346	goto out_unlock;
	347
	348	if (cio_update_schib(sch)) {
	349	css_sched_sch_todo(sch, SCH_TODO_UNREG);
	350	goto out_unlock;
	351	}
	352	private = get_eadm_private(sch);
353	if (private->state == EADM_NOT_OPER)
354	private->state = EADM_IDLE;
355
356	out_unlock:
357	spin_unlock_irqrestore(sch->lock, flags);
358
359	return ret;
360	}
361
362	static struct css_device_id eadm_subchannel_ids[] = {
363	{ .match_flags = 0x1, .type = SUBCHANNEL_TYPE_ADM, },
364	{ /* end of list */ },
365	};
366	MODULE_DEVICE_TABLE(css, eadm_subchannel_ids);
367
368	static struct css_driver eadm_subchannel_driver = {
369	.drv = {
370	.name = "eadm_subchannel",
371	.owner = THIS_MODULE,
372	},
373	.subchannel_type = eadm_subchannel_ids,
374	.irq = eadm_subchannel_irq,
375	.probe = eadm_subchannel_probe,
376	.remove = eadm_subchannel_remove,
377	.shutdown = eadm_subchannel_shutdown,
378	.sch_event = eadm_subchannel_sch_event,
379	.freeze = eadm_subchannel_freeze,
380	.thaw = eadm_subchannel_restore,
381	.restore = eadm_subchannel_restore,
382	};
383
eadb86ab SO	384	static int __init eadm_sch_init(void)
	385	{
	386	int ret;
	387
	388	if (!css_general_characteristics.eadm)
	389	return -ENXIO;
	390
	391	eadm_debug = debug_register("eadm_log", 16, 1, 16);
	392	if (!eadm_debug)
	393	return -ENOMEM;
	394
	395	debug_register_view(eadm_debug, &debug_hex_ascii_view);
	396	debug_set_level(eadm_debug, 2);
	397
	398	isc_register(EADM_SCH_ISC);
	399	ret = css_driver_register(&eadm_subchannel_driver);
	400	if (ret)
	401	goto cleanup;
	402
eadb86ab SO	403	return ret;
	404
	405	cleanup:
	406	isc_unregister(EADM_SCH_ISC);
	407	debug_unregister(eadm_debug);
	408	return ret;
	409	}
	410
	411	static void __exit eadm_sch_exit(void)
	412	{
eadb86ab SO	413	css_driver_unregister(&eadm_subchannel_driver);
	414	isc_unregister(EADM_SCH_ISC);
	415	debug_unregister(eadm_debug);
	416	}
	417	module_init(eadm_sch_init);
	418	module_exit(eadm_sch_exit);