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path: root/drivers/media/pci/saa7134/saa7134-vbi.c
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Diffstat (limited to 'drivers/media/pci/saa7134/saa7134-vbi.c')
-rw-r--r--drivers/media/pci/saa7134/saa7134-vbi.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/media/pci/saa7134/saa7134-vbi.c b/drivers/media/pci/saa7134/saa7134-vbi.c
new file mode 100644
index 000000000..3e7736904
--- /dev/null
+++ b/drivers/media/pci/saa7134/saa7134-vbi.c
@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * device driver for philips saa7134 based TV cards
+ * video4linux video interface
+ *
+ * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
+ */
+
+#include "saa7134.h"
+#include "saa7134-reg.h"
+
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/kernel.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 vbi_dbg(fmt, arg...) do { \
+ if (vbi_debug) \
+ printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \
+ } while (0)
+
+/* ------------------------------------------------------------------ */
+
+#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_buf.vb2_queue->drv_priv;
+ unsigned long control, base;
+
+ vbi_dbg("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 vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
+ struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
+ struct sg_table *dma = vb2_dma_sg_plane_desc(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,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[], struct device *alloc_devs[])
+{
+ 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 vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
+ struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
+
+ dmaq->curr = NULL;
+ buf->activate = buffer_activate;
+ return 0;
+}
+
+const 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);
+ timer_setup(&dev->vbi_q.timeout, saa7134_buffer_timeout, 0);
+ 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 */
+ del_timer_sync(&dev->vbi_q.timeout);
+ 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);
+}