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linux/drivers/media/pci/saa7134/saa7134-vbi.c
Hans Verkuil 2ada815fc4 [media] saa7134: convert to vb2 
Convert the saa7134 driver to vb2.

Note that while this uses the vb2-dma-sg version, the VB2_USERPTR mode is
disabled. The DMA hardware only supports DMAing full pages, and in the
USERPTR memory model the first and last scatter-gather buffer is almost
never a full page.

In practice this means that we can't use the VB2_USERPTR mode.

This has been tested with raw video, compressed video, VBI, radio, DVB and
video overlays.

Unfortunately, a vb2 conversion is one of those things you cannot split
up in smaller patches, it's all or nothing. This patch switches the whole
driver over to vb2, using the vb2 ioctl and fop helper functions.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
2014-05-23 14:16:20 -03:00

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/*
*
* 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 <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include "saa7134-reg.h"
#include "saa7134.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 dprintk(fmt, arg...) if (vbi_debug) \
printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
/* ------------------------------------------------------------------ */
#define VBI_LINE_COUNT 16
#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;
dprintk("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;
int ret;
size = dev->vbi_hlen * dev->vbi_vlen * 2;
if (vb2_plane_size(vb2, 0) < size)
return -EINVAL;
vb2_set_plane_payload(vb2, 0, size);
ret = dma_map_sg(&dev->pci->dev, dma->sgl, dma->nents, DMA_FROM_DEVICE);
if (!ret)
return -EIO;
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;
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;
}
static void buffer_finish(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);
dma_unmap_sg(&dev->pci->dev, dma->sgl, dma->nents, DMA_FROM_DEVICE);
}
struct vb2_ops saa7134_vbi_qops = {
.queue_setup = queue_setup,
.buf_init = buffer_init,
.buf_prepare = buffer_prepare,
.buf_finish = buffer_finish,
.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);
}
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