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linux/drivers/media/pci/saa7134/saa7134-vbi.c
Hans Verkuil d790b7eda9 [media] vb2-dma-sg: move dma_(un)map_sg here 
This moves dma_(un)map_sg to the get_userptr/put_userptr and alloc/put
memops of videobuf2-dma-sg.c and adds dma_sync_sg_for_device/cpu to the
prepare/finish memops.

Now that vb2-dma-sg will sync the buffers for you in the prepare/finish
memops we can drop that from the drivers that use dma-sg.

For the solo6x10 driver that was a bit more involved because it needs to
copy JPEG or MPEG headers to the buffer before returning it to userspace,
and that cannot be done in the old place since the buffer there is still
setup for DMA access, not for CPU access. However, the buf_finish
op is the ideal place to do this. By the time buf_finish is called
the buffer is available for CPU access, so copying to the buffer is fine.

[mchehab@osg.samsung.com: Fix a compilation breakage:
 drivers/media/v4l2-core/videobuf2-dma-sg.c:150:19: error: 'struct vb2_dma_sg_buf' has no member named 'dma_sgt']

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
2014-11-25 09:01:16 -02:00

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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 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;
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;
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);
}
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