[mirror_ubuntu-bionic-kernel.git] / drivers / media / video / bt8xx / bttv-vbi.c

/*

    bttv - Bt848 frame grabber driver
    vbi interface

    (c) 2002 Gerd Knorr <kraxel@bytesex.org>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/kdev_t.h>
#include <asm/io.h>
#include "bttvp.h"

/* Offset from line sync pulse leading edge (0H) to start of VBI capture,
   in fCLKx2 pixels.  According to the datasheet, VBI capture starts
   VBI_HDELAY fCLKx1 pixels from the tailing edgeof /HRESET, and /HRESET
   is 64 fCLKx1 pixels wide.  VBI_HDELAY is set to 0, so this should be
   (64 + 0) * 2 = 128 fCLKx2 pixels.  But it's not!  The datasheet is
   Just Plain Wrong.  The real value appears to be different for
   different revisions of the bt8x8 chips, and to be affected by the
   horizontal scaling factor.  Experimentally, the value is measured
   to be about 244.  */
#define VBI_OFFSET 244

#define VBI_DEFLINES 16
#define VBI_MAXLINES 32

static unsigned int vbibufs = 4;
static unsigned int vbi_debug = 0;

module_param(vbibufs,   int, 0444);
module_param(vbi_debug, int, 0644);
MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32, default 4");
MODULE_PARM_DESC(vbi_debug,"vbi code debug messages, default is 0 (no)");

#ifdef dprintk
# undef dprintk
#endif
#define dprintk(fmt, arg...)	if (vbi_debug) \
	printk(KERN_DEBUG "bttv%d/vbi: " fmt, btv->c.nr , ## arg)

/* ----------------------------------------------------------------------- */
/* vbi risc code + mm                                                      */

static int
vbi_buffer_risc(struct bttv *btv, struct bttv_buffer *buf, int lines)
{
	int bpl = 2048;

	bttv_risc_packed(btv, &buf->top, buf->vb.dma.sglist,
			 0, bpl-4, 4, lines);
	bttv_risc_packed(btv, &buf->bottom, buf->vb.dma.sglist,
			 lines * bpl, bpl-4, 4, lines);
	return 0;
}

static int vbi_buffer_setup(struct videobuf_queue *q,
			    unsigned int *count, unsigned int *size)
{
	struct bttv_fh *fh = q->priv_data;
	struct bttv *btv = fh->btv;

	if (0 == *count)
		*count = vbibufs;
	*size = fh->lines * 2 * 2048;
	dprintk("setup: lines=%d\n",fh->lines);
	return 0;
}

static int vbi_buffer_prepare(struct videobuf_queue *q,
			      struct videobuf_buffer *vb,
			      enum v4l2_field field)
{
	struct bttv_fh *fh = q->priv_data;
	struct bttv *btv = fh->btv;
	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
	int rc;

	buf->vb.size = fh->lines * 2 * 2048;
	if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
		return -EINVAL;

	if (STATE_NEEDS_INIT == buf->vb.state) {
		if (0 != (rc = videobuf_iolock(q, &buf->vb, NULL)))
			goto fail;
		if (0 != (rc = vbi_buffer_risc(btv,buf,fh->lines)))
			goto fail;
	}
	buf->vb.state = STATE_PREPARED;
	buf->vb.field = field;
	dprintk("buf prepare %p: top=%p bottom=%p field=%s\n",
		vb, &buf->top, &buf->bottom,
		v4l2_field_names[buf->vb.field]);
	return 0;

 fail:
	bttv_dma_free(q,btv,buf);
	return rc;
}

static void
vbi_buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
	struct bttv_fh *fh = q->priv_data;
	struct bttv *btv = fh->btv;
	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);

	dprintk("queue %p\n",vb);
	buf->vb.state = STATE_QUEUED;
	list_add_tail(&buf->vb.queue,&btv->vcapture);
	if (NULL == btv->cvbi) {
		fh->btv->loop_irq |= 4;
		bttv_set_dma(btv,0x0c);
	}
}

static void vbi_buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
	struct bttv_fh *fh = q->priv_data;
	struct bttv *btv = fh->btv;
	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);

	dprintk("free %p\n",vb);
	bttv_dma_free(&fh->cap,fh->btv,buf);
}

struct videobuf_queue_ops bttv_vbi_qops = {
	.buf_setup    = vbi_buffer_setup,
	.buf_prepare  = vbi_buffer_prepare,
	.buf_queue    = vbi_buffer_queue,
	.buf_release  = vbi_buffer_release,
};

/* ----------------------------------------------------------------------- */

void bttv_vbi_setlines(struct bttv_fh *fh, struct bttv *btv, int lines)
{
	int vdelay;

	if (lines < 1)
		lines = 1;
	if (lines > VBI_MAXLINES)
		lines = VBI_MAXLINES;
	fh->lines = lines;

	vdelay = btread(BT848_E_VDELAY_LO);
	if (vdelay < lines*2) {
		vdelay = lines*2;
		btwrite(vdelay,BT848_E_VDELAY_LO);
		btwrite(vdelay,BT848_O_VDELAY_LO);
	}
}

void bttv_vbi_try_fmt(struct bttv_fh *fh, struct v4l2_format *f)
{
	const struct bttv_tvnorm *tvnorm;
	s64 count0,count1,count;

	tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
	f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
	f->fmt.vbi.sampling_rate    = tvnorm->Fsc;
	f->fmt.vbi.samples_per_line = 2048;
	f->fmt.vbi.sample_format    = V4L2_PIX_FMT_GREY;
	f->fmt.vbi.offset           = VBI_OFFSET;
	f->fmt.vbi.flags            = 0;

	/* s64 to prevent overflow. */
	count0 = (s64) f->fmt.vbi.start[0] + f->fmt.vbi.count[0]
		- tvnorm->vbistart[0];
	count1 = (s64) f->fmt.vbi.start[1] + f->fmt.vbi.count[1]
		- tvnorm->vbistart[1];
	count  = clamp (max (count0, count1), (s64) 1, (s64) VBI_MAXLINES);

	f->fmt.vbi.start[0] = tvnorm->vbistart[0];
	f->fmt.vbi.start[1] = tvnorm->vbistart[1];
	f->fmt.vbi.count[0] = count;
	f->fmt.vbi.count[1] = count;

	f->fmt.vbi.reserved[0] = 0;
	f->fmt.vbi.reserved[1] = 0;
}

void bttv_vbi_get_fmt(struct bttv_fh *fh, struct v4l2_format *f)
{
	const struct bttv_tvnorm *tvnorm;

	tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
	memset(f,0,sizeof(*f));
	f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
	f->fmt.vbi.sampling_rate    = tvnorm->Fsc;
	f->fmt.vbi.samples_per_line = 2048;
	f->fmt.vbi.sample_format    = V4L2_PIX_FMT_GREY;
	f->fmt.vbi.offset           = VBI_OFFSET;
	f->fmt.vbi.start[0]         = tvnorm->vbistart[0];
	f->fmt.vbi.start[1]         = tvnorm->vbistart[1];
	f->fmt.vbi.count[0]         = fh->lines;
	f->fmt.vbi.count[1]         = fh->lines;
	f->fmt.vbi.flags            = 0;
}

/* ----------------------------------------------------------------------- */
/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2
	3	bttv - Bt848 frame grabber driver
	4	vbi interface
	5
	6	(c) 2002 Gerd Knorr <kraxel@bytesex.org>
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
	20	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/moduleparam.h>
	25	#include <linux/errno.h>
	26	#include <linux/fs.h>
	27	#include <linux/kernel.h>
	28	#include <linux/sched.h>
	29	#include <linux/interrupt.h>
	30	#include <linux/kdev_t.h>
	31	#include <asm/io.h>
	32	#include "bttvp.h"
	33
ddecbe11 TP	34	/* Offset from line sync pulse leading edge (0H) to start of VBI capture,
	35	in fCLKx2 pixels. According to the datasheet, VBI capture starts
	36	VBI_HDELAY fCLKx1 pixels from the tailing edgeof /HRESET, and /HRESET
	37	is 64 fCLKx1 pixels wide. VBI_HDELAY is set to 0, so this should be
	38	(64 + 0) * 2 = 128 fCLKx2 pixels. But it's not! The datasheet is
	39	Just Plain Wrong. The real value appears to be different for
	40	different revisions of the bt8x8 chips, and to be affected by the
	41	horizontal scaling factor. Experimentally, the value is measured
	42	to be about 244. */
	43	#define VBI_OFFSET 244
67f1570a	44
1da177e4 LT	45	#define VBI_DEFLINES 16
	46	#define VBI_MAXLINES 32
	47
	48	static unsigned int vbibufs = 4;
	49	static unsigned int vbi_debug = 0;
	50
	51	module_param(vbibufs, int, 0444);
	52	module_param(vbi_debug, int, 0644);
	53	MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32, default 4");
	54	MODULE_PARM_DESC(vbi_debug,"vbi code debug messages, default is 0 (no)");
	55
	56	#ifdef dprintk
	57	# undef dprintk
	58	#endif
	59	#define dprintk(fmt, arg...) if (vbi_debug) \
	60	printk(KERN_DEBUG "bttv%d/vbi: " fmt, btv->c.nr , ## arg)
	61
	62	/* ----------------------------------------------------------------------- */
	63	/* vbi risc code + mm */
	64
	65	static int
	66	vbi_buffer_risc(struct bttv btv, struct bttv_buffer buf, int lines)
	67	{
	68	int bpl = 2048;
	69
	70	bttv_risc_packed(btv, &buf->top, buf->vb.dma.sglist,
	71	0, bpl-4, 4, lines);
	72	bttv_risc_packed(btv, &buf->bottom, buf->vb.dma.sglist,
	73	lines * bpl, bpl-4, 4, lines);
	74	return 0;
	75	}
	76
	77	static int vbi_buffer_setup(struct videobuf_queue *q,
	78	unsigned int count, unsigned int size)
	79	{
	80	struct bttv_fh *fh = q->priv_data;
	81	struct bttv *btv = fh->btv;
	82
	83	if (0 == *count)
	84	*count = vbibufs;
	85	size = fh->lines 2 * 2048;
	86	dprintk("setup: lines=%d\n",fh->lines);
	87	return 0;
	88	}
	89
	90	static int vbi_buffer_prepare(struct videobuf_queue *q,
	91	struct videobuf_buffer *vb,
	92	enum v4l2_field field)
	93	{
	94	struct bttv_fh *fh = q->priv_data;
	95	struct bttv *btv = fh->btv;
	96	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
	97	int rc;
	98
	99	buf->vb.size = fh->lines * 2 * 2048;
	100	if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
	101	return -EINVAL;
	102
	103	if (STATE_NEEDS_INIT == buf->vb.state) {
c7b0ac05	104	if (0 != (rc = videobuf_iolock(q, &buf->vb, NULL)))
1da177e4 LT	105	goto fail;
	106	if (0 != (rc = vbi_buffer_risc(btv,buf,fh->lines)))
	107	goto fail;
	108	}
	109	buf->vb.state = STATE_PREPARED;
	110	buf->vb.field = field;
	111	dprintk("buf prepare %p: top=%p bottom=%p field=%s\n",
	112	vb, &buf->top, &buf->bottom,
	113	v4l2_field_names[buf->vb.field]);
	114	return 0;
	115
	116	fail:
c7b0ac05	117	bttv_dma_free(q,btv,buf);
1da177e4 LT	118	return rc;
	119	}
	120
	121	static void
	122	vbi_buffer_queue(struct videobuf_queue q, struct videobuf_buffer vb)
	123	{
	124	struct bttv_fh *fh = q->priv_data;
	125	struct bttv *btv = fh->btv;
	126	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
	127
	128	dprintk("queue %p\n",vb);
	129	buf->vb.state = STATE_QUEUED;
	130	list_add_tail(&buf->vb.queue,&btv->vcapture);
	131	if (NULL == btv->cvbi) {
	132	fh->btv->loop_irq \|= 4;
	133	bttv_set_dma(btv,0x0c);
	134	}
	135	}
	136
	137	static void vbi_buffer_release(struct videobuf_queue q, struct videobuf_buffer vb)
	138	{
	139	struct bttv_fh *fh = q->priv_data;
	140	struct bttv *btv = fh->btv;
	141	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
	142
	143	dprintk("free %p\n",vb);
c7b0ac05	144	bttv_dma_free(&fh->cap,fh->btv,buf);
1da177e4 LT	145	}
	146
	147	struct videobuf_queue_ops bttv_vbi_qops = {
	148	.buf_setup = vbi_buffer_setup,
	149	.buf_prepare = vbi_buffer_prepare,
	150	.buf_queue = vbi_buffer_queue,
	151	.buf_release = vbi_buffer_release,
	152	};
	153
	154	/* ----------------------------------------------------------------------- */
	155
	156	void bttv_vbi_setlines(struct bttv_fh fh, struct bttv btv, int lines)
	157	{
	158	int vdelay;
	159
	160	if (lines < 1)
	161	lines = 1;
	162	if (lines > VBI_MAXLINES)
	163	lines = VBI_MAXLINES;
	164	fh->lines = lines;
	165
	166	vdelay = btread(BT848_E_VDELAY_LO);
	167	if (vdelay < lines*2) {
	168	vdelay = lines*2;
	169	btwrite(vdelay,BT848_E_VDELAY_LO);
	170	btwrite(vdelay,BT848_O_VDELAY_LO);
	171	}
	172	}
	173
	174	void bttv_vbi_try_fmt(struct bttv_fh fh, struct v4l2_format f)
	175	{
	176	const struct bttv_tvnorm *tvnorm;
67f1570a	177	s64 count0,count1,count;
1da177e4 LT	178
	179	tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
	180	f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
	181	f->fmt.vbi.sampling_rate = tvnorm->Fsc;
	182	f->fmt.vbi.samples_per_line = 2048;
	183	f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
67f1570a	184	f->fmt.vbi.offset = VBI_OFFSET;
1da177e4	185	f->fmt.vbi.flags = 0;
1da177e4	186
67f1570a MS	187	/* s64 to prevent overflow. */
	188	count0 = (s64) f->fmt.vbi.start[0] + f->fmt.vbi.count[0]
	189	- tvnorm->vbistart[0];
	190	count1 = (s64) f->fmt.vbi.start[1] + f->fmt.vbi.count[1]
	191	- tvnorm->vbistart[1];
4ae5c2e5	192	count = clamp (max (count0, count1), (s64) 1, (s64) VBI_MAXLINES);
1da177e4	193
67f1570a MS	194	f->fmt.vbi.start[0] = tvnorm->vbistart[0];
67f1570a MS	195	f->fmt.vbi.start[1] = tvnorm->vbistart[1];
1da177e4 LT	196	f->fmt.vbi.count[0] = count;
1da177e4 LT	197	f->fmt.vbi.count[1] = count;
67f1570a MS	198
	199	f->fmt.vbi.reserved[0] = 0;
	200	f->fmt.vbi.reserved[1] = 0;
1da177e4 LT	201	}
	202
	203	void bttv_vbi_get_fmt(struct bttv_fh fh, struct v4l2_format f)
	204	{
	205	const struct bttv_tvnorm *tvnorm;
	206
	207	tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
	208	memset(f,0,sizeof(*f));
	209	f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
	210	f->fmt.vbi.sampling_rate = tvnorm->Fsc;
	211	f->fmt.vbi.samples_per_line = 2048;
	212	f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
67f1570a MS	213	f->fmt.vbi.offset = VBI_OFFSET;
	214	f->fmt.vbi.start[0] = tvnorm->vbistart[0];
	215	f->fmt.vbi.start[1] = tvnorm->vbistart[1];
1da177e4 LT	216	f->fmt.vbi.count[0] = fh->lines;
	217	f->fmt.vbi.count[1] = fh->lines;
	218	f->fmt.vbi.flags = 0;
1da177e4 LT	219	}
	220
	221	/* ----------------------------------------------------------------------- */
	222	/*
	223	* Local variables:
	224	* c-basic-offset: 8
	225	* End:
	226	*/