mirror of https://gitee.com/openkylin/linux.git
256 lines
7.3 KiB
C
256 lines
7.3 KiB
C
/*
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*
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* device driver for philips saa7134 based TV cards
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* video4linux video interface
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*
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* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include "saa7134-reg.h"
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#include "saa7134.h"
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/* ------------------------------------------------------------------ */
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static unsigned int vbi_debug = 0;
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module_param(vbi_debug, int, 0644);
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MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
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static unsigned int vbibufs = 4;
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module_param(vbibufs, int, 0444);
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MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
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#define dprintk(fmt, arg...) if (vbi_debug) \
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printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
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/* ------------------------------------------------------------------ */
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#define VBI_LINE_COUNT 16
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#define VBI_LINE_LENGTH 2048
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#define VBI_SCALE 0x200
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static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
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int task)
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{
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struct saa7134_tvnorm *norm = dev->tvnorm;
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/* setup video scaler */
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saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start & 0xff);
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saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start >> 8);
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saa_writeb(SAA7134_VBI_H_STOP1(task), norm->h_stop & 0xff);
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saa_writeb(SAA7134_VBI_H_STOP2(task), norm->h_stop >> 8);
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saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 & 0xff);
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saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
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saa_writeb(SAA7134_VBI_V_STOP1(task), norm->vbi_v_stop_0 & 0xff);
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saa_writeb(SAA7134_VBI_V_STOP2(task), norm->vbi_v_stop_0 >> 8);
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saa_writeb(SAA7134_VBI_H_SCALE_INC1(task), VBI_SCALE & 0xff);
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saa_writeb(SAA7134_VBI_H_SCALE_INC2(task), VBI_SCALE >> 8);
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saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task), 0x00);
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saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
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saa_writeb(SAA7134_VBI_H_LEN1(task), buf->vb.width & 0xff);
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saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width >> 8);
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saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height & 0xff);
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saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height >> 8);
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saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
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}
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/* ------------------------------------------------------------------ */
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static int buffer_activate(struct saa7134_dev *dev,
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struct saa7134_buf *buf,
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struct saa7134_buf *next)
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{
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unsigned long control,base;
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dprintk("buffer_activate [%p]\n",buf);
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buf->vb.state = STATE_ACTIVE;
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buf->top_seen = 0;
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task_init(dev,buf,TASK_A);
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task_init(dev,buf,TASK_B);
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saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
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saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
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/* DMA: setup channel 2+3 (= VBI Task A+B) */
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base = saa7134_buffer_base(buf);
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control = SAA7134_RS_CONTROL_BURST_16 |
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SAA7134_RS_CONTROL_ME |
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(buf->pt->dma >> 12);
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saa_writel(SAA7134_RS_BA1(2),base);
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saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2);
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saa_writel(SAA7134_RS_PITCH(2),buf->vb.width);
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saa_writel(SAA7134_RS_CONTROL(2),control);
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saa_writel(SAA7134_RS_BA1(3),base);
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saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2);
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saa_writel(SAA7134_RS_PITCH(3),buf->vb.width);
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saa_writel(SAA7134_RS_CONTROL(3),control);
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/* start DMA */
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saa7134_set_dmabits(dev);
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mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT);
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return 0;
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}
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static int buffer_prepare(struct videobuf_queue *q,
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struct videobuf_buffer *vb,
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enum v4l2_field field)
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{
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struct saa7134_fh *fh = q->priv_data;
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struct saa7134_dev *dev = fh->dev;
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struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
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struct saa7134_tvnorm *norm = dev->tvnorm;
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unsigned int lines, llength, size;
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int err;
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lines = norm->vbi_v_stop_0 - norm->vbi_v_start_0 +1;
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if (lines > VBI_LINE_COUNT)
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lines = VBI_LINE_COUNT;
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llength = VBI_LINE_LENGTH;
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size = lines * llength * 2;
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if (0 != buf->vb.baddr && buf->vb.bsize < size)
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return -EINVAL;
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if (buf->vb.size != size)
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saa7134_dma_free(q,buf);
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if (STATE_NEEDS_INIT == buf->vb.state) {
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buf->vb.width = llength;
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buf->vb.height = lines;
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buf->vb.size = size;
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buf->pt = &fh->pt_vbi;
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err = videobuf_iolock(q,&buf->vb,NULL);
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if (err)
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goto oops;
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err = saa7134_pgtable_build(dev->pci,buf->pt,
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buf->vb.dma.sglist,
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buf->vb.dma.sglen,
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saa7134_buffer_startpage(buf));
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if (err)
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goto oops;
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}
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buf->vb.state = STATE_PREPARED;
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buf->activate = buffer_activate;
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buf->vb.field = field;
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return 0;
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oops:
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saa7134_dma_free(q,buf);
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return err;
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}
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static int
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buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
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{
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struct saa7134_fh *fh = q->priv_data;
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struct saa7134_dev *dev = fh->dev;
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int llength,lines;
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lines = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 +1;
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llength = VBI_LINE_LENGTH;
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*size = lines * llength * 2;
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if (0 == *count)
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*count = vbibufs;
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*count = saa7134_buffer_count(*size,*count);
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return 0;
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}
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static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
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{
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struct saa7134_fh *fh = q->priv_data;
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struct saa7134_dev *dev = fh->dev;
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struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
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saa7134_buffer_queue(dev,&dev->vbi_q,buf);
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}
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static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
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{
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struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
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saa7134_dma_free(q,buf);
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}
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struct videobuf_queue_ops saa7134_vbi_qops = {
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.buf_setup = buffer_setup,
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.buf_prepare = buffer_prepare,
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.buf_queue = buffer_queue,
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.buf_release = buffer_release,
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};
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/* ------------------------------------------------------------------ */
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int saa7134_vbi_init1(struct saa7134_dev *dev)
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{
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INIT_LIST_HEAD(&dev->vbi_q.queue);
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init_timer(&dev->vbi_q.timeout);
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dev->vbi_q.timeout.function = saa7134_buffer_timeout;
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dev->vbi_q.timeout.data = (unsigned long)(&dev->vbi_q);
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dev->vbi_q.dev = dev;
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if (vbibufs < 2)
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vbibufs = 2;
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if (vbibufs > VIDEO_MAX_FRAME)
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vbibufs = VIDEO_MAX_FRAME;
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return 0;
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}
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int saa7134_vbi_fini(struct saa7134_dev *dev)
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{
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/* nothing */
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return 0;
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}
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void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
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{
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spin_lock(&dev->slock);
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if (dev->vbi_q.curr) {
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dev->vbi_fieldcount++;
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/* make sure we have seen both fields */
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if ((status & 0x10) == 0x00) {
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dev->vbi_q.curr->top_seen = 1;
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goto done;
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}
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if (!dev->vbi_q.curr->top_seen)
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goto done;
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dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount;
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saa7134_buffer_finish(dev,&dev->vbi_q,STATE_DONE);
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}
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saa7134_buffer_next(dev,&dev->vbi_q);
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done:
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spin_unlock(&dev->slock);
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}
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/* ----------------------------------------------------------- */
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/*
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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