210 lines
6.1 KiB
C
210 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#include "saa7134.h"
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#include "saa7134-reg.h"
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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/kernel.h>
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/* ------------------------------------------------------------------ */
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static unsigned int vbi_debug;
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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 vbi_dbg(fmt, arg...) do { \
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if (vbi_debug) \
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printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \
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} while (0)
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/* ------------------------------------------------------------------ */
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#define VBI_LINE_COUNT 17
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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), dev->vbi_hlen & 0xff);
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saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
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saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
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saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 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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struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_buf.vb2_queue->drv_priv;
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unsigned long control, base;
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vbi_dbg("buffer_activate [%p]\n", buf);
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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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(dmaq->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 + dev->vbi_hlen * dev->vbi_vlen);
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saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
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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 + dev->vbi_hlen * dev->vbi_vlen);
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saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
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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(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);
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return 0;
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}
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static int buffer_prepare(struct vb2_buffer *vb2)
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{
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struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
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struct saa7134_dev *dev = dmaq->dev;
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struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
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struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
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struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0);
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unsigned int size;
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if (dma->sgl->offset) {
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pr_err("The buffer is not page-aligned\n");
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return -EINVAL;
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}
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size = dev->vbi_hlen * dev->vbi_vlen * 2;
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if (vb2_plane_size(vb2, 0) < size)
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return -EINVAL;
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vb2_set_plane_payload(vb2, 0, size);
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return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
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saa7134_buffer_startpage(buf));
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}
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static int queue_setup(struct vb2_queue *q,
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unsigned int *nbuffers, unsigned int *nplanes,
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unsigned int sizes[], struct device *alloc_devs[])
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{
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struct saa7134_dmaqueue *dmaq = q->drv_priv;
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struct saa7134_dev *dev = dmaq->dev;
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unsigned int size;
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dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
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if (dev->vbi_vlen > VBI_LINE_COUNT)
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dev->vbi_vlen = VBI_LINE_COUNT;
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dev->vbi_hlen = VBI_LINE_LENGTH;
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size = dev->vbi_hlen * dev->vbi_vlen * 2;
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*nbuffers = saa7134_buffer_count(size, *nbuffers);
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*nplanes = 1;
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sizes[0] = size;
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return 0;
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}
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static int buffer_init(struct vb2_buffer *vb2)
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{
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struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
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struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
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struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
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dmaq->curr = NULL;
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buf->activate = buffer_activate;
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return 0;
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}
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const struct vb2_ops saa7134_vbi_qops = {
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.queue_setup = queue_setup,
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.buf_init = buffer_init,
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.buf_prepare = buffer_prepare,
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.buf_queue = saa7134_vb2_buffer_queue,
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.wait_prepare = vb2_ops_wait_prepare,
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.wait_finish = vb2_ops_wait_finish,
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.start_streaming = saa7134_vb2_start_streaming,
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.stop_streaming = saa7134_vb2_stop_streaming,
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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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timer_setup(&dev->vbi_q.timeout, saa7134_buffer_timeout, 0);
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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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/* 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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saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_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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