diff options
Diffstat (limited to 'drivers/media/video/saa7134/saa7134-vbi.c')
| -rw-r--r-- | drivers/media/video/saa7134/saa7134-vbi.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/drivers/media/video/saa7134/saa7134-vbi.c b/drivers/media/video/saa7134/saa7134-vbi.c new file mode 100644 index 00000000000..86954cc7c37 --- /dev/null +++ b/drivers/media/video/saa7134/saa7134-vbi.c @@ -0,0 +1,270 @@ +/* + * $Id: saa7134-vbi.c,v 1.6 2004/12/10 12:33:39 kraxel Exp $ + * + * 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/moduleparam.h> +#include <linux/kernel.h> +#include <linux/slab.h> + +#include "saa7134-reg.h" +#include "saa7134.h" + +/* ------------------------------------------------------------------ */ + +static unsigned int vbi_debug = 0; +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 & 0xff); + saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start >> 8); + saa_writeb(SAA7134_VBI_V_STOP1(task), norm->vbi_v_stop & 0xff); + saa_writeb(SAA7134_VBI_V_STOP2(task), norm->vbi_v_stop >> 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), buf->vb.width & 0xff); + saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width >> 8); + saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height & 0xff); + saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height >> 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) +{ + unsigned long control,base; + + dprintk("buffer_activate [%p]\n",buf); + buf->vb.state = STATE_ACTIVE; + 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 | + (buf->pt->dma >> 12); + saa_writel(SAA7134_RS_BA1(2),base); + saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2); + saa_writel(SAA7134_RS_PITCH(2),buf->vb.width); + saa_writel(SAA7134_RS_CONTROL(2),control); + saa_writel(SAA7134_RS_BA1(3),base); + saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2); + saa_writel(SAA7134_RS_PITCH(3),buf->vb.width); + saa_writel(SAA7134_RS_CONTROL(3),control); + + /* start DMA */ + saa7134_set_dmabits(dev); + mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT); + + return 0; +} + +static int buffer_prepare(struct videobuf_queue *q, + struct videobuf_buffer *vb, + enum v4l2_field field) +{ + struct saa7134_fh *fh = q->priv_data; + struct saa7134_dev *dev = fh->dev; + struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb); + struct saa7134_tvnorm *norm = dev->tvnorm; + unsigned int lines, llength, size; + int err; + + lines = norm->vbi_v_stop - norm->vbi_v_start +1; + if (lines > VBI_LINE_COUNT) + lines = VBI_LINE_COUNT; +#if 1 + llength = VBI_LINE_LENGTH; +#else + llength = (norm->h_stop - norm->h_start +1) * 2; + if (llength > VBI_LINE_LENGTH) + llength = VBI_LINE_LENGTH; +#endif + size = lines * llength * 2; + if (0 != buf->vb.baddr && buf->vb.bsize < size) + return -EINVAL; + + if (buf->vb.size != size) + saa7134_dma_free(dev,buf); + + if (STATE_NEEDS_INIT == buf->vb.state) { + buf->vb.width = llength; + buf->vb.height = lines; + buf->vb.size = size; + buf->pt = &fh->pt_vbi; + + err = videobuf_iolock(dev->pci,&buf->vb,NULL); + if (err) + goto oops; + err = saa7134_pgtable_build(dev->pci,buf->pt, + buf->vb.dma.sglist, + buf->vb.dma.sglen, + saa7134_buffer_startpage(buf)); + if (err) + goto oops; + } + buf->vb.state = STATE_PREPARED; + buf->activate = buffer_activate; + buf->vb.field = field; + return 0; + + oops: + saa7134_dma_free(dev,buf); + return err; +} + +static int +buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size) +{ + struct saa7134_fh *fh = q->priv_data; + struct saa7134_dev *dev = fh->dev; + int llength,lines; + + lines = dev->tvnorm->vbi_v_stop - dev->tvnorm->vbi_v_start +1; +#if 1 + llength = VBI_LINE_LENGTH; +#else + llength = (norm->h_stop - norm->h_start +1) * 2; + if (llength > VBI_LINE_LENGTH) + llength = VBI_LINE_LENGTH; +#endif + *size = lines * llength * 2; + if (0 == *count) + *count = vbibufs; + *count = saa7134_buffer_count(*size,*count); + return 0; +} + +static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb) +{ + struct saa7134_fh *fh = q->priv_data; + struct saa7134_dev *dev = fh->dev; + struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb); + + saa7134_buffer_queue(dev,&dev->vbi_q,buf); +} + +static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb) +{ + struct saa7134_fh *fh = q->priv_data; + struct saa7134_dev *dev = fh->dev; + struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb); + + saa7134_dma_free(dev,buf); +} + +struct videobuf_queue_ops saa7134_vbi_qops = { + .buf_setup = buffer_setup, + .buf_prepare = buffer_prepare, + .buf_queue = buffer_queue, + .buf_release = buffer_release, +}; + +/* ------------------------------------------------------------------ */ + +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) { + dev->vbi_fieldcount++; + /* 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; + + dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount; + saa7134_buffer_finish(dev,&dev->vbi_q,STATE_DONE); + } + saa7134_buffer_next(dev,&dev->vbi_q); + + done: + spin_unlock(&dev->slock); +} + +/* ----------------------------------------------------------- */ +/* + * Local variables: + * c-basic-offset: 8 + * End: + */ |