[net-next-2.6.git] / drivers / char / drm / i915_irq.c

/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
 */
/*
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"

#define USER_INT_FLAG (1<<1)
#define VSYNC_PIPEB_FLAG (1<<5)
#define VSYNC_PIPEA_FLAG (1<<7)

#define MAX_NOPID ((u32)~0)

irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
{
	drm_device_t *dev = (drm_device_t *) arg;
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	u16 temp;

	temp = I915_READ16(I915REG_INT_IDENTITY_R);

	temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG);

	DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);

	if (temp == 0)
		return IRQ_NONE;

	I915_WRITE16(I915REG_INT_IDENTITY_R, temp);

	dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);

	if (temp & USER_INT_FLAG)
		DRM_WAKEUP(&dev_priv->irq_queue);

	if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
		atomic_inc(&dev->vbl_received);
		DRM_WAKEUP(&dev->vbl_queue);
		drm_vbl_send_signals(dev);
	}

	return IRQ_HANDLED;
}

static int i915_emit_irq(drm_device_t * dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	u32 ret;
	RING_LOCALS;

	i915_kernel_lost_context(dev);

	DRM_DEBUG("%s\n", __FUNCTION__);

	ret = dev_priv->counter;

	BEGIN_LP_RING(2);
	OUT_RING(0);
	OUT_RING(GFX_OP_USER_INTERRUPT);
	ADVANCE_LP_RING();

	return ret;
}

static int i915_wait_irq(drm_device_t * dev, int irq_nr)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	int ret = 0;

	DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
		  READ_BREADCRUMB(dev_priv));

	if (READ_BREADCRUMB(dev_priv) >= irq_nr)
		return 0;

	dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;

	DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
		    READ_BREADCRUMB(dev_priv) >= irq_nr);

	if (ret == DRM_ERR(EBUSY)) {
		DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
			  __FUNCTION__,
			  READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
	}

	dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
	return ret;
}

int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	unsigned int cur_vblank;
	int ret = 0;

	if (!dev_priv) {
		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
		return DRM_ERR(EINVAL);
	}

	DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
		    (((cur_vblank = atomic_read(&dev->vbl_received))
			- *sequence) <= (1<<23)));
	
	*sequence = cur_vblank;

	return ret;
}


/* Needs the lock as it touches the ring.
 */
int i915_irq_emit(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_irq_emit_t emit;
	int result;

	LOCK_TEST_WITH_RETURN(dev, filp);

	if (!dev_priv) {
		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
		return DRM_ERR(EINVAL);
	}

	DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data,
				 sizeof(emit));

	result = i915_emit_irq(dev);

	if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
		DRM_ERROR("copy_to_user\n");
		return DRM_ERR(EFAULT);
	}

	return 0;
}

/* Doesn't need the hardware lock.
 */
int i915_irq_wait(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_irq_wait_t irqwait;

	if (!dev_priv) {
		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
		return DRM_ERR(EINVAL);
	}

	DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data,
				 sizeof(irqwait));

	return i915_wait_irq(dev, irqwait.irq_seq);
}

static int i915_enable_interrupt (drm_device_t *dev)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	u16 flag;

	flag = 0;
	if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
		flag |= VSYNC_PIPEA_FLAG;
	if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
		flag |= VSYNC_PIPEB_FLAG;
	if (dev_priv->vblank_pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
		DRM_ERROR("%s called with invalid pipe 0x%x\n",
			  __FUNCTION__, dev_priv->vblank_pipe);
		return DRM_ERR(EINVAL);
	}
	I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | flag);
	return 0;
}

/* Set the vblank monitor pipe
 */
int i915_vblank_pipe_set(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_vblank_pipe_t pipe;

	if (!dev_priv) {
		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
		return DRM_ERR(EINVAL);
	}

	DRM_COPY_FROM_USER_IOCTL(pipe, (drm_i915_vblank_pipe_t __user *) data,
				 sizeof(pipe));

	dev_priv->vblank_pipe = pipe.pipe;
	return i915_enable_interrupt (dev);
}

int i915_vblank_pipe_get(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_vblank_pipe_t pipe;
	u16 flag;

	if (!dev_priv) {
		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
		return DRM_ERR(EINVAL);
	}

	flag = I915_READ(I915REG_INT_ENABLE_R);
	pipe.pipe = 0;
	if (flag & VSYNC_PIPEA_FLAG)
		pipe.pipe |= DRM_I915_VBLANK_PIPE_A;
	if (flag & VSYNC_PIPEB_FLAG)
		pipe.pipe |= DRM_I915_VBLANK_PIPE_B;
	DRM_COPY_TO_USER_IOCTL((drm_i915_vblank_pipe_t __user *) data, pipe,
				 sizeof(pipe));
	return 0;
}

/* drm_dma.h hooks
*/
void i915_driver_irq_preinstall(drm_device_t * dev)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;

	I915_WRITE16(I915REG_HWSTAM, 0xfffe);
	I915_WRITE16(I915REG_INT_MASK_R, 0x0);
	I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
}

void i915_driver_irq_postinstall(drm_device_t * dev)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;

	i915_enable_interrupt(dev);
	DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
}

void i915_driver_irq_uninstall(drm_device_t * dev)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	u16 temp;

	if (!dev_priv)
		return;

	I915_WRITE16(I915REG_HWSTAM, 0xffff);
	I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
	I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);

	temp = I915_READ16(I915REG_INT_IDENTITY_R);
	I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
}
Commit	Line	Data
0d6aa60b	1	/* i915_irq.c -- IRQ support for the I915 -- linux-c --
1da177e4	2	*/
0d6aa60b	3	/*
1da177e4 LT	4	* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
1da177e4 LT	5	* All Rights Reserved.
bc54fd1a DA	6	*
	7	* Permission is hereby granted, free of charge, to any person obtaining a
	8	* copy of this software and associated documentation files (the
	9	* "Software"), to deal in the Software without restriction, including
	10	* without limitation the rights to use, copy, modify, merge, publish,
	11	* distribute, sub license, and/or sell copies of the Software, and to
	12	* permit persons to whom the Software is furnished to do so, subject to
	13	* the following conditions:
	14	*
	15	* The above copyright notice and this permission notice (including the
	16	* next paragraph) shall be included in all copies or substantial portions
	17	* of the Software.
	18	*
	19	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
	20	* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	21	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
	22	* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
	23	* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
	24	* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
	25	* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	26	*
0d6aa60b	27	*/
1da177e4 LT	28
	29	#include "drmP.h"
	30	#include "drm.h"
	31	#include "i915_drm.h"
	32	#include "i915_drv.h"
	33
0d6aa60b DA	34	#define USER_INT_FLAG (1<<1)
	35	#define VSYNC_PIPEB_FLAG (1<<5)
	36	#define VSYNC_PIPEA_FLAG (1<<7)
	37
1da177e4	38	#define MAX_NOPID ((u32)~0)
1da177e4 LT	39
	40	irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
	41	{
	42	drm_device_t dev = (drm_device_t ) arg;
	43	drm_i915_private_t dev_priv = (drm_i915_private_t ) dev->dev_private;
	44	u16 temp;
	45
	46	temp = I915_READ16(I915REG_INT_IDENTITY_R);
702880f2 DA	47
702880f2 DA	48	temp &= (USER_INT_FLAG \| VSYNC_PIPEA_FLAG \| VSYNC_PIPEB_FLAG);
1da177e4 LT	49
	50	DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
	51
	52	if (temp == 0)
	53	return IRQ_NONE;
	54
	55	I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
0d6aa60b	56
6e5fca53 DA	57	dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
6e5fca53 DA	58
0d6aa60b DA	59	if (temp & USER_INT_FLAG)
	60	DRM_WAKEUP(&dev_priv->irq_queue);
	61
702880f2	62	if (temp & (VSYNC_PIPEA_FLAG \| VSYNC_PIPEB_FLAG)) {
0d6aa60b DA	63	atomic_inc(&dev->vbl_received);
	64	DRM_WAKEUP(&dev->vbl_queue);
	65	drm_vbl_send_signals(dev);
	66	}
1da177e4 LT	67
	68	return IRQ_HANDLED;
	69	}
	70
c94f7029	71	static int i915_emit_irq(drm_device_t * dev)
1da177e4 LT	72	{
	73	drm_i915_private_t *dev_priv = dev->dev_private;
	74	u32 ret;
	75	RING_LOCALS;
	76
	77	i915_kernel_lost_context(dev);
	78
	79	DRM_DEBUG("%s\n", __FUNCTION__);
	80
	81	ret = dev_priv->counter;
	82
	83	BEGIN_LP_RING(2);
	84	OUT_RING(0);
	85	OUT_RING(GFX_OP_USER_INTERRUPT);
	86	ADVANCE_LP_RING();
	87
	88	return ret;
	89	}
	90
c94f7029	91	static int i915_wait_irq(drm_device_t * dev, int irq_nr)
1da177e4 LT	92	{
	93	drm_i915_private_t dev_priv = (drm_i915_private_t ) dev->dev_private;
	94	int ret = 0;
	95
	96	DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
	97	READ_BREADCRUMB(dev_priv));
	98
	99	if (READ_BREADCRUMB(dev_priv) >= irq_nr)
	100	return 0;
	101
	102	dev_priv->sarea_priv->perf_boxes \|= I915_BOX_WAIT;
	103
	104	DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
	105	READ_BREADCRUMB(dev_priv) >= irq_nr);
	106
	107	if (ret == DRM_ERR(EBUSY)) {
	108	DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
	109	__FUNCTION__,
	110	READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
	111	}
	112
	113	dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
	114	return ret;
	115	}
	116
0d6aa60b DA	117	int i915_driver_vblank_wait(drm_device_t dev, unsigned int sequence)
	118	{
	119	drm_i915_private_t *dev_priv = dev->dev_private;
	120	unsigned int cur_vblank;
	121	int ret = 0;
	122
	123	if (!dev_priv) {
	124	DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
	125	return DRM_ERR(EINVAL);
	126	}
	127
	128	DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
	129	(((cur_vblank = atomic_read(&dev->vbl_received))
	130	- *sequence) <= (1<<23)));
	131
	132	*sequence = cur_vblank;
	133
	134	return ret;
	135	}
	136
	137
1da177e4 LT	138	/* Needs the lock as it touches the ring.
	139	*/
	140	int i915_irq_emit(DRM_IOCTL_ARGS)
	141	{
	142	DRM_DEVICE;
	143	drm_i915_private_t *dev_priv = dev->dev_private;
	144	drm_i915_irq_emit_t emit;
	145	int result;
	146
	147	LOCK_TEST_WITH_RETURN(dev, filp);
	148
	149	if (!dev_priv) {
	150	DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
	151	return DRM_ERR(EINVAL);
	152	}
	153
	154	DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data,
	155	sizeof(emit));
	156
	157	result = i915_emit_irq(dev);
	158
	159	if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
	160	DRM_ERROR("copy_to_user\n");
	161	return DRM_ERR(EFAULT);
	162	}
	163
	164	return 0;
	165	}
	166
	167	/* Doesn't need the hardware lock.
	168	*/
	169	int i915_irq_wait(DRM_IOCTL_ARGS)
	170	{
	171	DRM_DEVICE;
	172	drm_i915_private_t *dev_priv = dev->dev_private;
	173	drm_i915_irq_wait_t irqwait;
	174
	175	if (!dev_priv) {
	176	DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
	177	return DRM_ERR(EINVAL);
	178	}
	179
	180	DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data,
	181	sizeof(irqwait));
	182
	183	return i915_wait_irq(dev, irqwait.irq_seq);
	184	}
	185
702880f2 DA	186	static int i915_enable_interrupt (drm_device_t *dev)
	187	{
	188	drm_i915_private_t dev_priv = (drm_i915_private_t ) dev->dev_private;
	189	u16 flag;
	190
	191	flag = 0;
	192	if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
	193	flag \|= VSYNC_PIPEA_FLAG;
	194	if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
	195	flag \|= VSYNC_PIPEB_FLAG;
	196	if (dev_priv->vblank_pipe & ~(DRM_I915_VBLANK_PIPE_A\|DRM_I915_VBLANK_PIPE_B)) {
	197	DRM_ERROR("%s called with invalid pipe 0x%x\n",
	198	__FUNCTION__, dev_priv->vblank_pipe);
	199	return DRM_ERR(EINVAL);
	200	}
	201	I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG \| flag);
	202	return 0;
	203	}
	204
	205	/* Set the vblank monitor pipe
	206	*/
	207	int i915_vblank_pipe_set(DRM_IOCTL_ARGS)
	208	{
	209	DRM_DEVICE;
	210	drm_i915_private_t *dev_priv = dev->dev_private;
	211	drm_i915_vblank_pipe_t pipe;
	212
	213	if (!dev_priv) {
	214	DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
	215	return DRM_ERR(EINVAL);
	216	}
	217
	218	DRM_COPY_FROM_USER_IOCTL(pipe, (drm_i915_vblank_pipe_t __user *) data,
	219	sizeof(pipe));
	220
	221	dev_priv->vblank_pipe = pipe.pipe;
	222	return i915_enable_interrupt (dev);
	223	}
	224
	225	int i915_vblank_pipe_get(DRM_IOCTL_ARGS)
	226	{
	227	DRM_DEVICE;
	228	drm_i915_private_t *dev_priv = dev->dev_private;
	229	drm_i915_vblank_pipe_t pipe;
	230	u16 flag;
	231
	232	if (!dev_priv) {
	233	DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
	234	return DRM_ERR(EINVAL);
	235	}
	236
	237	flag = I915_READ(I915REG_INT_ENABLE_R);
	238	pipe.pipe = 0;
	239	if (flag & VSYNC_PIPEA_FLAG)
	240	pipe.pipe \|= DRM_I915_VBLANK_PIPE_A;
	241	if (flag & VSYNC_PIPEB_FLAG)
	242	pipe.pipe \|= DRM_I915_VBLANK_PIPE_B;
	243	DRM_COPY_TO_USER_IOCTL((drm_i915_vblank_pipe_t __user *) data, pipe,
	244	sizeof(pipe));
	245	return 0;
	246	}
	247
1da177e4 LT	248	/* drm_dma.h hooks
	249	*/
	250	void i915_driver_irq_preinstall(drm_device_t * dev)
	251	{
	252	drm_i915_private_t dev_priv = (drm_i915_private_t ) dev->dev_private;
	253
	254	I915_WRITE16(I915REG_HWSTAM, 0xfffe);
	255	I915_WRITE16(I915REG_INT_MASK_R, 0x0);
	256	I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
	257	}
	258
	259	void i915_driver_irq_postinstall(drm_device_t * dev)
	260	{
	261	drm_i915_private_t dev_priv = (drm_i915_private_t ) dev->dev_private;
	262
702880f2	263	i915_enable_interrupt(dev);
1da177e4 LT	264	DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
	265	}
	266
	267	void i915_driver_irq_uninstall(drm_device_t * dev)
	268	{
	269	drm_i915_private_t dev_priv = (drm_i915_private_t ) dev->dev_private;
91e3738e DA	270	u16 temp;
91e3738e DA	271
1da177e4 LT	272	if (!dev_priv)
	273	return;
	274
	275	I915_WRITE16(I915REG_HWSTAM, 0xffff);
	276	I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
	277	I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
91e3738e DA	278
	279	temp = I915_READ16(I915REG_INT_IDENTITY_R);
	280	I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
1da177e4	281	}