[deliverable/linux.git] / drivers / gpu / drm / omapdrm / omap_irq.c

/*
 * drivers/gpu/drm/omapdrm/omap_irq.c
 *
 * Copyright (C) 2012 Texas Instruments
 * Author: Rob Clark <rob.clark@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "omap_drv.h"

static DEFINE_SPINLOCK(list_lock);

static void omap_irq_error_handler(struct omap_drm_irq *irq,
		uint32_t irqstatus)
{
	DRM_ERROR("errors: %08x\n", irqstatus);
}

/* call with list_lock and dispc runtime held */
static void omap_irq_update(struct drm_device *dev)
{
	struct omap_drm_private *priv = dev->dev_private;
	struct omap_drm_irq *irq;
	uint32_t irqmask = priv->vblank_mask;

	BUG_ON(!spin_is_locked(&list_lock));

	list_for_each_entry(irq, &priv->irq_list, node)
		irqmask |= irq->irqmask;

	DBG("irqmask=%08x", irqmask);

	dispc_write_irqenable(irqmask);
	dispc_read_irqenable();        /* flush posted write */
}

void __omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq)
{
	struct omap_drm_private *priv = dev->dev_private;
	unsigned long flags;

	spin_lock_irqsave(&list_lock, flags);

	if (!WARN_ON(irq->registered)) {
		irq->registered = true;
		list_add(&irq->node, &priv->irq_list);
		omap_irq_update(dev);
	}

	spin_unlock_irqrestore(&list_lock, flags);
}

void omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq)
{
	dispc_runtime_get();

	__omap_irq_register(dev, irq);

	dispc_runtime_put();
}

void __omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq)
{
	unsigned long flags;

	spin_lock_irqsave(&list_lock, flags);

	if (!WARN_ON(!irq->registered)) {
		irq->registered = false;
		list_del(&irq->node);
		omap_irq_update(dev);
	}

	spin_unlock_irqrestore(&list_lock, flags);
}

void omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq)
{
	dispc_runtime_get();

	__omap_irq_unregister(dev, irq);

	dispc_runtime_put();
}

struct omap_irq_wait {
	struct omap_drm_irq irq;
	int count;
};

static DECLARE_WAIT_QUEUE_HEAD(wait_event);

static void wait_irq(struct omap_drm_irq *irq, uint32_t irqstatus)
{
	struct omap_irq_wait *wait =
			container_of(irq, struct omap_irq_wait, irq);
	wait->count--;
	wake_up_all(&wait_event);
}

struct omap_irq_wait * omap_irq_wait_init(struct drm_device *dev,
		uint32_t irqmask, int count)
{
	struct omap_irq_wait *wait = kzalloc(sizeof(*wait), GFP_KERNEL);
	wait->irq.irq = wait_irq;
	wait->irq.irqmask = irqmask;
	wait->count = count;
	omap_irq_register(dev, &wait->irq);
	return wait;
}

int omap_irq_wait(struct drm_device *dev, struct omap_irq_wait *wait,
		unsigned long timeout)
{
	int ret = wait_event_timeout(wait_event, (wait->count <= 0), timeout);
	omap_irq_unregister(dev, &wait->irq);
	kfree(wait);
	if (ret == 0)
		return -1;
	return 0;
}

/**
 * enable_vblank - enable vblank interrupt events
 * @dev: DRM device
 * @crtc: which irq to enable
 *
 * Enable vblank interrupts for @crtc.  If the device doesn't have
 * a hardware vblank counter, this routine should be a no-op, since
 * interrupts will have to stay on to keep the count accurate.
 *
 * RETURNS
 * Zero on success, appropriate errno if the given @crtc's vblank
 * interrupt cannot be enabled.
 */
int omap_irq_enable_vblank(struct drm_device *dev, int crtc_id)
{
	struct omap_drm_private *priv = dev->dev_private;
	struct drm_crtc *crtc = priv->crtcs[crtc_id];
	unsigned long flags;

	DBG("dev=%p, crtc=%d", dev, crtc_id);

	dispc_runtime_get();
	spin_lock_irqsave(&list_lock, flags);
	priv->vblank_mask |= pipe2vbl(crtc);
	omap_irq_update(dev);
	spin_unlock_irqrestore(&list_lock, flags);
	dispc_runtime_put();

	return 0;
}

/**
 * disable_vblank - disable vblank interrupt events
 * @dev: DRM device
 * @crtc: which irq to enable
 *
 * Disable vblank interrupts for @crtc.  If the device doesn't have
 * a hardware vblank counter, this routine should be a no-op, since
 * interrupts will have to stay on to keep the count accurate.
 */
void omap_irq_disable_vblank(struct drm_device *dev, int crtc_id)
{
	struct omap_drm_private *priv = dev->dev_private;
	struct drm_crtc *crtc = priv->crtcs[crtc_id];
	unsigned long flags;

	DBG("dev=%p, crtc=%d", dev, crtc_id);

	dispc_runtime_get();
	spin_lock_irqsave(&list_lock, flags);
	priv->vblank_mask &= ~pipe2vbl(crtc);
	omap_irq_update(dev);
	spin_unlock_irqrestore(&list_lock, flags);
	dispc_runtime_put();
}

irqreturn_t omap_irq_handler(int irq, void *arg)
{
	struct drm_device *dev = (struct drm_device *) arg;
	struct omap_drm_private *priv = dev->dev_private;
	struct omap_drm_irq *handler, *n;
	unsigned long flags;
	unsigned int id;
	u32 irqstatus;

	irqstatus = dispc_read_irqstatus();
	dispc_clear_irqstatus(irqstatus);
	dispc_read_irqstatus();        /* flush posted write */

	VERB("irqs: %08x", irqstatus);

	for (id = 0; id < priv->num_crtcs; id++) {
		struct drm_crtc *crtc = priv->crtcs[id];

		if (irqstatus & pipe2vbl(crtc))
			drm_handle_vblank(dev, id);
	}

	spin_lock_irqsave(&list_lock, flags);
	list_for_each_entry_safe(handler, n, &priv->irq_list, node) {
		if (handler->irqmask & irqstatus) {
			spin_unlock_irqrestore(&list_lock, flags);
			handler->irq(handler, handler->irqmask & irqstatus);
			spin_lock_irqsave(&list_lock, flags);
		}
	}
	spin_unlock_irqrestore(&list_lock, flags);

	return IRQ_HANDLED;
}

void omap_irq_preinstall(struct drm_device *dev)
{
	DBG("dev=%p", dev);
	dispc_runtime_get();
	dispc_clear_irqstatus(0xffffffff);
	dispc_runtime_put();
}

int omap_irq_postinstall(struct drm_device *dev)
{
	struct omap_drm_private *priv = dev->dev_private;
	struct omap_drm_irq *error_handler = &priv->error_handler;

	DBG("dev=%p", dev);

	INIT_LIST_HEAD(&priv->irq_list);

	error_handler->irq = omap_irq_error_handler;
	error_handler->irqmask = DISPC_IRQ_OCP_ERR;

	/* for now ignore DISPC_IRQ_SYNC_LOST_DIGIT.. really I think
	 * we just need to ignore it while enabling tv-out
	 */
	error_handler->irqmask &= ~DISPC_IRQ_SYNC_LOST_DIGIT;

	omap_irq_register(dev, error_handler);

	return 0;
}

void omap_irq_uninstall(struct drm_device *dev)
{
	DBG("dev=%p", dev);
	// TODO prolly need to call drm_irq_uninstall() somewhere too
}

/*
 * We need a special version, instead of just using drm_irq_install(),
 * because we need to register the irq via omapdss.  Once omapdss and
 * omapdrm are merged together we can assign the dispc hwmod data to
 * ourselves and drop these and just use drm_irq_{install,uninstall}()
 */

int omap_drm_irq_install(struct drm_device *dev)
{
	int ret;

	mutex_lock(&dev->struct_mutex);

	if (dev->irq_enabled) {
		mutex_unlock(&dev->struct_mutex);
		return -EBUSY;
	}
	dev->irq_enabled = true;
	mutex_unlock(&dev->struct_mutex);

	/* Before installing handler */
	if (dev->driver->irq_preinstall)
		dev->driver->irq_preinstall(dev);

	ret = dispc_request_irq(dev->driver->irq_handler, dev);

	if (ret < 0) {
		mutex_lock(&dev->struct_mutex);
		dev->irq_enabled = false;
		mutex_unlock(&dev->struct_mutex);
		return ret;
	}

	/* After installing handler */
	if (dev->driver->irq_postinstall)
		ret = dev->driver->irq_postinstall(dev);

	if (ret < 0) {
		mutex_lock(&dev->struct_mutex);
		dev->irq_enabled = false;
		mutex_unlock(&dev->struct_mutex);
		dispc_free_irq(dev);
	}

	return ret;
}

int omap_drm_irq_uninstall(struct drm_device *dev)
{
	unsigned long irqflags;
	bool irq_enabled;
	int i;

	mutex_lock(&dev->struct_mutex);
	irq_enabled = dev->irq_enabled;
	dev->irq_enabled = false;
	mutex_unlock(&dev->struct_mutex);

	/*
	 * Wake up any waiters so they don't hang.
	 */
	if (dev->num_crtcs) {
		spin_lock_irqsave(&dev->vbl_lock, irqflags);
		for (i = 0; i < dev->num_crtcs; i++) {
			wake_up(&dev->vblank[i].queue);
			dev->vblank[i].enabled = false;
			dev->vblank[i].last =
				dev->driver->get_vblank_counter(dev, i);
		}
		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
	}

	if (!irq_enabled)
		return -EINVAL;

	if (dev->driver->irq_uninstall)
		dev->driver->irq_uninstall(dev);

	dispc_free_irq(dev);

	return 0;
}
Commit	Line	Data
f5f9454c	1	/*
8bb0daff	2	* drivers/gpu/drm/omapdrm/omap_irq.c
f5f9454c RC	3	*
	4	* Copyright (C) 2012 Texas Instruments
	5	* Author: Rob Clark <rob.clark@linaro.org>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License version 2 as published by
	9	* the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but WITHOUT
	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	14	* more details.
	15	*
	16	* You should have received a copy of the GNU General Public License along with
	17	* this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include "omap_drv.h"
	21
	22	static DEFINE_SPINLOCK(list_lock);
	23
	24	static void omap_irq_error_handler(struct omap_drm_irq *irq,
	25	uint32_t irqstatus)
	26	{
	27	DRM_ERROR("errors: %08x\n", irqstatus);
	28	}
	29
	30	/* call with list_lock and dispc runtime held */
	31	static void omap_irq_update(struct drm_device *dev)
	32	{
	33	struct omap_drm_private *priv = dev->dev_private;
	34	struct omap_drm_irq *irq;
	35	uint32_t irqmask = priv->vblank_mask;
	36
	37	BUG_ON(!spin_is_locked(&list_lock));
	38
	39	list_for_each_entry(irq, &priv->irq_list, node)
	40	irqmask \|= irq->irqmask;
	41
	42	DBG("irqmask=%08x", irqmask);
	43
	44	dispc_write_irqenable(irqmask);
	45	dispc_read_irqenable(); /* flush posted write */
	46	}
	47
6da9f891	48	void __omap_irq_register(struct drm_device dev, struct omap_drm_irq irq)
f5f9454c RC	49	{
	50	struct omap_drm_private *priv = dev->dev_private;
	51	unsigned long flags;
	52
f5f9454c RC	53	spin_lock_irqsave(&list_lock, flags);
	54
	55	if (!WARN_ON(irq->registered)) {
	56	irq->registered = true;
	57	list_add(&irq->node, &priv->irq_list);
	58	omap_irq_update(dev);
	59	}
	60
	61	spin_unlock_irqrestore(&list_lock, flags);
6da9f891 TV	62	}
	63
	64	void omap_irq_register(struct drm_device dev, struct omap_drm_irq irq)
	65	{
	66	dispc_runtime_get();
	67
	68	__omap_irq_register(dev, irq);
	69
f5f9454c RC	70	dispc_runtime_put();
	71	}
	72
6da9f891	73	void __omap_irq_unregister(struct drm_device dev, struct omap_drm_irq irq)
f5f9454c RC	74	{
	75	unsigned long flags;
	76
f5f9454c RC	77	spin_lock_irqsave(&list_lock, flags);
	78
	79	if (!WARN_ON(!irq->registered)) {
	80	irq->registered = false;
	81	list_del(&irq->node);
	82	omap_irq_update(dev);
	83	}
	84
	85	spin_unlock_irqrestore(&list_lock, flags);
6da9f891 TV	86	}
	87
	88	void omap_irq_unregister(struct drm_device dev, struct omap_drm_irq irq)
	89	{
	90	dispc_runtime_get();
	91
	92	__omap_irq_unregister(dev, irq);
	93
f5f9454c RC	94	dispc_runtime_put();
	95	}
	96
	97	struct omap_irq_wait {
	98	struct omap_drm_irq irq;
	99	int count;
	100	};
	101
	102	static DECLARE_WAIT_QUEUE_HEAD(wait_event);
	103
	104	static void wait_irq(struct omap_drm_irq *irq, uint32_t irqstatus)
	105	{
	106	struct omap_irq_wait *wait =
	107	container_of(irq, struct omap_irq_wait, irq);
	108	wait->count--;
	109	wake_up_all(&wait_event);
	110	}
	111
	112	struct omap_irq_wait * omap_irq_wait_init(struct drm_device *dev,
	113	uint32_t irqmask, int count)
	114	{
	115	struct omap_irq_wait wait = kzalloc(sizeof(wait), GFP_KERNEL);
	116	wait->irq.irq = wait_irq;
	117	wait->irq.irqmask = irqmask;
	118	wait->count = count;
	119	omap_irq_register(dev, &wait->irq);
	120	return wait;
	121	}
	122
	123	int omap_irq_wait(struct drm_device dev, struct omap_irq_wait wait,
	124	unsigned long timeout)
	125	{
	126	int ret = wait_event_timeout(wait_event, (wait->count <= 0), timeout);
	127	omap_irq_unregister(dev, &wait->irq);
	128	kfree(wait);
	129	if (ret == 0)
	130	return -1;
	131	return 0;
	132	}
	133
	134	/**
	135	* enable_vblank - enable vblank interrupt events
	136	* @dev: DRM device
	137	* @crtc: which irq to enable
	138	*
	139	* Enable vblank interrupts for @crtc. If the device doesn't have
	140	* a hardware vblank counter, this routine should be a no-op, since
	141	* interrupts will have to stay on to keep the count accurate.
	142	*
	143	* RETURNS
	144	* Zero on success, appropriate errno if the given @crtc's vblank
	145	* interrupt cannot be enabled.
	146	*/
0d8f371f	147	int omap_irq_enable_vblank(struct drm_device *dev, int crtc_id)
f5f9454c RC	148	{
f5f9454c RC	149	struct omap_drm_private *priv = dev->dev_private;
0d8f371f	150	struct drm_crtc *crtc = priv->crtcs[crtc_id];
f5f9454c RC	151	unsigned long flags;
f5f9454c RC	152
0d8f371f	153	DBG("dev=%p, crtc=%d", dev, crtc_id);
f5f9454c RC	154
	155	dispc_runtime_get();
	156	spin_lock_irqsave(&list_lock, flags);
	157	priv->vblank_mask \|= pipe2vbl(crtc);
	158	omap_irq_update(dev);
	159	spin_unlock_irqrestore(&list_lock, flags);
	160	dispc_runtime_put();
	161
	162	return 0;
	163	}
	164
	165	/**
	166	* disable_vblank - disable vblank interrupt events
	167	* @dev: DRM device
	168	* @crtc: which irq to enable
	169	*
	170	* Disable vblank interrupts for @crtc. If the device doesn't have
	171	* a hardware vblank counter, this routine should be a no-op, since
	172	* interrupts will have to stay on to keep the count accurate.
	173	*/
0d8f371f	174	void omap_irq_disable_vblank(struct drm_device *dev, int crtc_id)
f5f9454c RC	175	{
f5f9454c RC	176	struct omap_drm_private *priv = dev->dev_private;
0d8f371f	177	struct drm_crtc *crtc = priv->crtcs[crtc_id];
f5f9454c RC	178	unsigned long flags;
f5f9454c RC	179
0d8f371f	180	DBG("dev=%p, crtc=%d", dev, crtc_id);
f5f9454c RC	181
	182	dispc_runtime_get();
	183	spin_lock_irqsave(&list_lock, flags);
	184	priv->vblank_mask &= ~pipe2vbl(crtc);
	185	omap_irq_update(dev);
	186	spin_unlock_irqrestore(&list_lock, flags);
	187	dispc_runtime_put();
	188	}
	189
e9f0d76f	190	irqreturn_t omap_irq_handler(int irq, void *arg)
f5f9454c RC	191	{
	192	struct drm_device dev = (struct drm_device ) arg;
	193	struct omap_drm_private *priv = dev->dev_private;
	194	struct omap_drm_irq handler, n;
	195	unsigned long flags;
	196	unsigned int id;
	197	u32 irqstatus;
	198
	199	irqstatus = dispc_read_irqstatus();
	200	dispc_clear_irqstatus(irqstatus);
	201	dispc_read_irqstatus(); /* flush posted write */
	202
	203	VERB("irqs: %08x", irqstatus);
	204
0d8f371f AT	205	for (id = 0; id < priv->num_crtcs; id++) {
	206	struct drm_crtc *crtc = priv->crtcs[id];
	207
	208	if (irqstatus & pipe2vbl(crtc))
f5f9454c	209	drm_handle_vblank(dev, id);
0d8f371f	210	}
f5f9454c RC	211
	212	spin_lock_irqsave(&list_lock, flags);
	213	list_for_each_entry_safe(handler, n, &priv->irq_list, node) {
	214	if (handler->irqmask & irqstatus) {
	215	spin_unlock_irqrestore(&list_lock, flags);
	216	handler->irq(handler, handler->irqmask & irqstatus);
	217	spin_lock_irqsave(&list_lock, flags);
	218	}
	219	}
	220	spin_unlock_irqrestore(&list_lock, flags);
	221
	222	return IRQ_HANDLED;
	223	}
	224
	225	void omap_irq_preinstall(struct drm_device *dev)
	226	{
	227	DBG("dev=%p", dev);
	228	dispc_runtime_get();
	229	dispc_clear_irqstatus(0xffffffff);
	230	dispc_runtime_put();
	231	}
	232
	233	int omap_irq_postinstall(struct drm_device *dev)
	234	{
	235	struct omap_drm_private *priv = dev->dev_private;
	236	struct omap_drm_irq *error_handler = &priv->error_handler;
	237
	238	DBG("dev=%p", dev);
	239
	240	INIT_LIST_HEAD(&priv->irq_list);
	241
	242	error_handler->irq = omap_irq_error_handler;
	243	error_handler->irqmask = DISPC_IRQ_OCP_ERR;
	244
	245	/* for now ignore DISPC_IRQ_SYNC_LOST_DIGIT.. really I think
	246	* we just need to ignore it while enabling tv-out
	247	*/
	248	error_handler->irqmask &= ~DISPC_IRQ_SYNC_LOST_DIGIT;
	249
	250	omap_irq_register(dev, error_handler);
	251
	252	return 0;
	253	}
	254
	255	void omap_irq_uninstall(struct drm_device *dev)
	256	{
	257	DBG("dev=%p", dev);
	258	// TODO prolly need to call drm_irq_uninstall() somewhere too
	259	}
	260
	261	/*
	262	* We need a special version, instead of just using drm_irq_install(),
	263	* because we need to register the irq via omapdss. Once omapdss and
	264	* omapdrm are merged together we can assign the dispc hwmod data to
	265	* ourselves and drop these and just use drm_irq_{install,uninstall}()
	266	*/
	267
	268	int omap_drm_irq_install(struct drm_device *dev)
	269	{
	270	int ret;
	271
	272	mutex_lock(&dev->struct_mutex);
	273
	274	if (dev->irq_enabled) {
275	mutex_unlock(&dev->struct_mutex);
276	return -EBUSY;
277	}
4423843c	278	dev->irq_enabled = true;
f5f9454c RC	279	mutex_unlock(&dev->struct_mutex);
	280
	281	/* Before installing handler */
	282	if (dev->driver->irq_preinstall)
	283	dev->driver->irq_preinstall(dev);
	284
	285	ret = dispc_request_irq(dev->driver->irq_handler, dev);
	286
	287	if (ret < 0) {
	288	mutex_lock(&dev->struct_mutex);
4423843c	289	dev->irq_enabled = false;
f5f9454c RC	290	mutex_unlock(&dev->struct_mutex);
	291	return ret;
	292	}
	293
	294	/* After installing handler */
	295	if (dev->driver->irq_postinstall)
	296	ret = dev->driver->irq_postinstall(dev);
	297
	298	if (ret < 0) {
	299	mutex_lock(&dev->struct_mutex);
4423843c	300	dev->irq_enabled = false;
f5f9454c RC	301	mutex_unlock(&dev->struct_mutex);
	302	dispc_free_irq(dev);
	303	}
	304
	305	return ret;
	306	}
	307
	308	int omap_drm_irq_uninstall(struct drm_device *dev)
	309	{
	310	unsigned long irqflags;
4423843c VS	311	bool irq_enabled;
4423843c VS	312	int i;
f5f9454c RC	313
	314	mutex_lock(&dev->struct_mutex);
	315	irq_enabled = dev->irq_enabled;
4423843c	316	dev->irq_enabled = false;
f5f9454c RC	317	mutex_unlock(&dev->struct_mutex);
	318
	319	/*
	320	* Wake up any waiters so they don't hang.
	321	*/
	322	if (dev->num_crtcs) {
	323	spin_lock_irqsave(&dev->vbl_lock, irqflags);
	324	for (i = 0; i < dev->num_crtcs; i++) {
57ed0f7b	325	wake_up(&dev->vblank[i].queue);
5380e929 VS	326	dev->vblank[i].enabled = false;
5380e929 VS	327	dev->vblank[i].last =
f5f9454c RC	328	dev->driver->get_vblank_counter(dev, i);
	329	}
	330	spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
	331	}
	332
	333	if (!irq_enabled)
	334	return -EINVAL;
	335
	336	if (dev->driver->irq_uninstall)
	337	dev->driver->irq_uninstall(dev);
	338
	339	dispc_free_irq(dev);
	340
	341	return 0;
	342	}