drivers/media/pci/saa7134/saa7134-vbi.c - linux - Git at Google

 /*
  *
  * device driver for philips saa7134 based TV cards
  * video4linux video interface
  *
  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
  *
  *  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 "saa7134.h"
 #include "saa7134-reg.h"

 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/kernel.h>

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

 static unsigned int vbi_debug;
 module_param(vbi_debug, int, 0644);
 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");

 static unsigned int vbibufs = 4;
 module_param(vbibufs, int, 0444);
 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");

 #define vbi_dbg(fmt, arg...) do { \
 	if (vbi_debug) \
 		printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \
 	} while (0)

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

 #define VBI_LINE_COUNT     17
 #define VBI_LINE_LENGTH  2048
 #define VBI_SCALE       0x200

 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
 		      int task)
 {
 	struct saa7134_tvnorm *norm = dev->tvnorm;

 	/* setup video scaler */
 	saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
 	saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
 	saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
 	saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
 	saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
 	saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
 	saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
 	saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);

 	saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
 	saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
 	saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
 	saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);

 	saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff);
 	saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
 	saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
 	saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8);

 	saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
 }

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

 static int buffer_activate(struct saa7134_dev *dev,
 			   struct saa7134_buf *buf,
 			   struct saa7134_buf *next)
 {
 	struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_queue->drv_priv;
 	unsigned long control, base;

 	vbi_dbg("buffer_activate [%p]\n", buf);
 	buf->top_seen = 0;

 	task_init(dev, buf, TASK_A);
 	task_init(dev, buf, TASK_B);
 	saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
 	saa_writeb(SAA7134_OFMT_DATA_B, 0x06);

 	/* DMA: setup channel 2+3 (= VBI Task A+B) */
 	base    = saa7134_buffer_base(buf);
 	control = SAA7134_RS_CONTROL_BURST_16 |
 		SAA7134_RS_CONTROL_ME |
 		(dmaq->pt.dma >> 12);
 	saa_writel(SAA7134_RS_BA1(2), base);
 	saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen);
 	saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
 	saa_writel(SAA7134_RS_CONTROL(2), control);
 	saa_writel(SAA7134_RS_BA1(3), base);
 	saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen);
 	saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
 	saa_writel(SAA7134_RS_CONTROL(3), control);

 	/* start DMA */
 	saa7134_set_dmabits(dev);
 	mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);

 	return 0;
 }

 static int buffer_prepare(struct vb2_buffer *vb2)
 {
 	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 	struct saa7134_dev *dev = dmaq->dev;
 	struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
 	struct sg_table *dma = vb2_dma_sg_plane_desc(&buf->vb2, 0);
 	unsigned int size;

 	if (dma->sgl->offset) {
 		pr_err("The buffer is not page-aligned\n");
 		return -EINVAL;
 	}
 	size = dev->vbi_hlen * dev->vbi_vlen * 2;
 	if (vb2_plane_size(vb2, 0) < size)
 		return -EINVAL;

 	vb2_set_plane_payload(vb2, 0, size);

 	return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
 				    saa7134_buffer_startpage(buf));
 }

 static int queue_setup(struct vb2_queue *q, const struct v4l2_format *fmt,
 			   unsigned int *nbuffers, unsigned int *nplanes,
 			   unsigned int sizes[], void *alloc_ctxs[])
 {
 	struct saa7134_dmaqueue *dmaq = q->drv_priv;
 	struct saa7134_dev *dev = dmaq->dev;
 	unsigned int size;

 	dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
 	if (dev->vbi_vlen > VBI_LINE_COUNT)
 		dev->vbi_vlen = VBI_LINE_COUNT;
 	dev->vbi_hlen = VBI_LINE_LENGTH;
 	size = dev->vbi_hlen * dev->vbi_vlen * 2;

 	*nbuffers = saa7134_buffer_count(size, *nbuffers);
 	*nplanes = 1;
 	sizes[0] = size;
 	alloc_ctxs[0] = dev->alloc_ctx;
 	return 0;
 }

 static int buffer_init(struct vb2_buffer *vb2)
 {
 	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 	struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);

 	dmaq->curr = NULL;
 	buf->activate = buffer_activate;
 	return 0;
 }

 struct vb2_ops saa7134_vbi_qops = {
 	.queue_setup	= queue_setup,
 	.buf_init	= buffer_init,
 	.buf_prepare	= buffer_prepare,
 	.buf_queue	= saa7134_vb2_buffer_queue,
 	.wait_prepare	= vb2_ops_wait_prepare,
 	.wait_finish	= vb2_ops_wait_finish,
 	.start_streaming = saa7134_vb2_start_streaming,
 	.stop_streaming = saa7134_vb2_stop_streaming,
 };

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

 int saa7134_vbi_init1(struct saa7134_dev *dev)
 {
 	INIT_LIST_HEAD(&dev->vbi_q.queue);
 	init_timer(&dev->vbi_q.timeout);
 	dev->vbi_q.timeout.function = saa7134_buffer_timeout;
 	dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
 	dev->vbi_q.dev              = dev;

 	if (vbibufs < 2)
 		vbibufs = 2;
 	if (vbibufs > VIDEO_MAX_FRAME)
 		vbibufs = VIDEO_MAX_FRAME;
 	return 0;
 }

 int saa7134_vbi_fini(struct saa7134_dev *dev)
 {
 	/* nothing */
 	return 0;
 }

 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
 {
 	spin_lock(&dev->slock);
 	if (dev->vbi_q.curr) {
 		/* make sure we have seen both fields */
 		if ((status & 0x10) == 0x00) {
 			dev->vbi_q.curr->top_seen = 1;
 			goto done;
 		}
 		if (!dev->vbi_q.curr->top_seen)
 			goto done;

 		saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
 	}
 	saa7134_buffer_next(dev, &dev->vbi_q);

  done:
 	spin_unlock(&dev->slock);
 }
	/*
	*
	* device driver for philips saa7134 based TV cards
	* video4linux video interface
	*
	* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
	*
	* 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 "saa7134.h"
	#include "saa7134-reg.h"

	#include <linux/init.h>
	#include <linux/list.h>
	#include <linux/module.h>
	#include <linux/kernel.h>

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

	static unsigned int vbi_debug;
	module_param(vbi_debug, int, 0644);
	MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");

	static unsigned int vbibufs = 4;
	module_param(vbibufs, int, 0444);
	MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");

	#define vbi_dbg(fmt, arg...) do { \
	if (vbi_debug) \
	printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \
	} while (0)

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

	#define VBI_LINE_COUNT 17
	#define VBI_LINE_LENGTH 2048
	#define VBI_SCALE 0x200

	static void task_init(struct saa7134_dev dev, struct saa7134_buf buf,
	int task)
	{
	struct saa7134_tvnorm *norm = dev->tvnorm;

	/* setup video scaler */
	saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start & 0xff);
	saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start >> 8);
	saa_writeb(SAA7134_VBI_H_STOP1(task), norm->h_stop & 0xff);
	saa_writeb(SAA7134_VBI_H_STOP2(task), norm->h_stop >> 8);
	saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 & 0xff);
	saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
	saa_writeb(SAA7134_VBI_V_STOP1(task), norm->vbi_v_stop_0 & 0xff);
	saa_writeb(SAA7134_VBI_V_STOP2(task), norm->vbi_v_stop_0 >> 8);

	saa_writeb(SAA7134_VBI_H_SCALE_INC1(task), VBI_SCALE & 0xff);
	saa_writeb(SAA7134_VBI_H_SCALE_INC2(task), VBI_SCALE >> 8);
	saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task), 0x00);
	saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);

	saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff);
	saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
	saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
	saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8);

	saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
	}

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

	static int buffer_activate(struct saa7134_dev *dev,
	struct saa7134_buf *buf,
	struct saa7134_buf *next)
	{
	struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_queue->drv_priv;
	unsigned long control, base;

	vbi_dbg("buffer_activate [%p]\n", buf);
	buf->top_seen = 0;

	task_init(dev, buf, TASK_A);
	task_init(dev, buf, TASK_B);
	saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
	saa_writeb(SAA7134_OFMT_DATA_B, 0x06);

	/* DMA: setup channel 2+3 (= VBI Task A+B) */
	base = saa7134_buffer_base(buf);
	control = SAA7134_RS_CONTROL_BURST_16 \|
	SAA7134_RS_CONTROL_ME \|
	(dmaq->pt.dma >> 12);
	saa_writel(SAA7134_RS_BA1(2), base);
	saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen);
	saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
	saa_writel(SAA7134_RS_CONTROL(2), control);
	saa_writel(SAA7134_RS_BA1(3), base);
	saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen);
	saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
	saa_writel(SAA7134_RS_CONTROL(3), control);

	/* start DMA */
	saa7134_set_dmabits(dev);
	mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);

	return 0;
	}

	static int buffer_prepare(struct vb2_buffer *vb2)
	{
	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
	struct saa7134_dev *dev = dmaq->dev;
	struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
	struct sg_table *dma = vb2_dma_sg_plane_desc(&buf->vb2, 0);
	unsigned int size;

	if (dma->sgl->offset) {
	pr_err("The buffer is not page-aligned\n");
	return -EINVAL;
	}
	size = dev->vbi_hlen * dev->vbi_vlen * 2;
	if (vb2_plane_size(vb2, 0) < size)
	return -EINVAL;

	vb2_set_plane_payload(vb2, 0, size);

	return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
	saa7134_buffer_startpage(buf));
	}

	static int queue_setup(struct vb2_queue q, const struct v4l2_format fmt,
	unsigned int nbuffers, unsigned int nplanes,
	unsigned int sizes[], void *alloc_ctxs[])
	{
	struct saa7134_dmaqueue *dmaq = q->drv_priv;
	struct saa7134_dev *dev = dmaq->dev;
	unsigned int size;

	dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
	if (dev->vbi_vlen > VBI_LINE_COUNT)
	dev->vbi_vlen = VBI_LINE_COUNT;
	dev->vbi_hlen = VBI_LINE_LENGTH;
	size = dev->vbi_hlen * dev->vbi_vlen * 2;

	nbuffers = saa7134_buffer_count(size, nbuffers);
	*nplanes = 1;
	sizes[0] = size;
	alloc_ctxs[0] = dev->alloc_ctx;
	return 0;
	}

	static int buffer_init(struct vb2_buffer *vb2)
	{
	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
	struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);

	dmaq->curr = NULL;
	buf->activate = buffer_activate;
	return 0;
	}

	struct vb2_ops saa7134_vbi_qops = {
	.queue_setup = queue_setup,
	.buf_init = buffer_init,
	.buf_prepare = buffer_prepare,
	.buf_queue = saa7134_vb2_buffer_queue,
	.wait_prepare = vb2_ops_wait_prepare,
	.wait_finish = vb2_ops_wait_finish,
	.start_streaming = saa7134_vb2_start_streaming,
	.stop_streaming = saa7134_vb2_stop_streaming,
	};

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

	int saa7134_vbi_init1(struct saa7134_dev *dev)
	{
	INIT_LIST_HEAD(&dev->vbi_q.queue);
	init_timer(&dev->vbi_q.timeout);
	dev->vbi_q.timeout.function = saa7134_buffer_timeout;
	dev->vbi_q.timeout.data = (unsigned long)(&dev->vbi_q);
	dev->vbi_q.dev = dev;

	if (vbibufs < 2)
	vbibufs = 2;
	if (vbibufs > VIDEO_MAX_FRAME)
	vbibufs = VIDEO_MAX_FRAME;
	return 0;
	}

	int saa7134_vbi_fini(struct saa7134_dev *dev)
	{
	/* nothing */
	return 0;
	}

	void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
	{
	spin_lock(&dev->slock);
	if (dev->vbi_q.curr) {
	/* make sure we have seen both fields */
	if ((status & 0x10) == 0x00) {
	dev->vbi_q.curr->top_seen = 1;
	goto done;
	}
	if (!dev->vbi_q.curr->top_seen)
	goto done;

	saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
	}
	saa7134_buffer_next(dev, &dev->vbi_q);

	done:
	spin_unlock(&dev->slock);
	}