saa7134-vbi.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *
  4 * device driver for philips saa7134 based TV cards
  5 * video4linux video interface
  6 *
  7 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
  8 */
  9
 10#include "saa7134.h"
 11#include "saa7134-reg.h"
 12
 13#include <linux/init.h>
 14#include <linux/list.h>
 15#include <linux/module.h>
 16#include <linux/kernel.h>
 17
 18/* ------------------------------------------------------------------ */
 19
 20static unsigned int vbi_debug;
 21module_param(vbi_debug, int, 0644);
 22MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
 23
 24static unsigned int vbibufs = 4;
 25module_param(vbibufs, int, 0444);
 26MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
 27
 28#define vbi_dbg(fmt, arg...) do { \
 29	if (vbi_debug) \
 30		printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \
 31	} while (0)
 32
 33/* ------------------------------------------------------------------ */
 34
 35#define VBI_LINE_COUNT     17
 36#define VBI_LINE_LENGTH  2048
 37#define VBI_SCALE       0x200
 38
 39static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
 40		      int task)
 41{
 42	struct saa7134_tvnorm *norm = dev->tvnorm;
 43
 44	/* setup video scaler */
 45	saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
 46	saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
 47	saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
 48	saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
 49	saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
 50	saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
 51	saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
 52	saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
 53
 54	saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
 55	saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
 56	saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
 57	saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
 58
 59	saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff);
 60	saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
 61	saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
 62	saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8);
 63
 64	saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
 65}
 66
 67/* ------------------------------------------------------------------ */
 68
 69static int buffer_activate(struct saa7134_dev *dev,
 70			   struct saa7134_buf *buf,
 71			   struct saa7134_buf *next)
 72{
 73	struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_buf.vb2_queue->drv_priv;
 74	unsigned long control, base;
 75
 76	vbi_dbg("buffer_activate [%p]\n", buf);
 77	buf->top_seen = 0;
 78
 79	task_init(dev, buf, TASK_A);
 80	task_init(dev, buf, TASK_B);
 81	saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
 82	saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
 83
 84	/* DMA: setup channel 2+3 (= VBI Task A+B) */
 85	base    = saa7134_buffer_base(buf);
 86	control = SAA7134_RS_CONTROL_BURST_16 |
 87		SAA7134_RS_CONTROL_ME |
 88		(dmaq->pt.dma >> 12);
 89	saa_writel(SAA7134_RS_BA1(2), base);
 90	saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen);
 91	saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
 92	saa_writel(SAA7134_RS_CONTROL(2), control);
 93	saa_writel(SAA7134_RS_BA1(3), base);
 94	saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen);
 95	saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
 96	saa_writel(SAA7134_RS_CONTROL(3), control);
 97
 98	/* start DMA */
 99	saa7134_set_dmabits(dev);
100	mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);
101
102	return 0;
103}
104
105static int buffer_prepare(struct vb2_buffer *vb2)
106{
107	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
108	struct saa7134_dev *dev = dmaq->dev;
109	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
110	struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
111	struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0);
112	unsigned int size;
113
114	if (dma->sgl->offset) {
115		pr_err("The buffer is not page-aligned\n");
116		return -EINVAL;
117	}
118	size = dev->vbi_hlen * dev->vbi_vlen * 2;
119	if (vb2_plane_size(vb2, 0) < size)
120		return -EINVAL;
121
122	vb2_set_plane_payload(vb2, 0, size);
123
124	return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
125				    saa7134_buffer_startpage(buf));
126}
127
128static int queue_setup(struct vb2_queue *q,
129			   unsigned int *nbuffers, unsigned int *nplanes,
130			   unsigned int sizes[], struct device *alloc_devs[])
131{
132	struct saa7134_dmaqueue *dmaq = q->drv_priv;
133	struct saa7134_dev *dev = dmaq->dev;
134	unsigned int size;
135
136	dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
137	if (dev->vbi_vlen > VBI_LINE_COUNT)
138		dev->vbi_vlen = VBI_LINE_COUNT;
139	dev->vbi_hlen = VBI_LINE_LENGTH;
140	size = dev->vbi_hlen * dev->vbi_vlen * 2;
141
142	*nbuffers = saa7134_buffer_count(size, *nbuffers);
143	*nplanes = 1;
144	sizes[0] = size;
145	return 0;
146}
147
148static int buffer_init(struct vb2_buffer *vb2)
149{
150	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
151	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
152	struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
153
154	dmaq->curr = NULL;
155	buf->activate = buffer_activate;
156	return 0;
157}
158
159const struct vb2_ops saa7134_vbi_qops = {
160	.queue_setup	= queue_setup,
161	.buf_init	= buffer_init,
162	.buf_prepare	= buffer_prepare,
163	.buf_queue	= saa7134_vb2_buffer_queue,
164	.start_streaming = saa7134_vb2_start_streaming,
165	.stop_streaming = saa7134_vb2_stop_streaming,
166};
167
168/* ------------------------------------------------------------------ */
169
170int saa7134_vbi_init1(struct saa7134_dev *dev)
171{
172	INIT_LIST_HEAD(&dev->vbi_q.queue);
173	timer_setup(&dev->vbi_q.timeout, saa7134_buffer_timeout, 0);
174	dev->vbi_q.dev              = dev;
175
176	if (vbibufs < 2)
177		vbibufs = 2;
178	if (vbibufs > VIDEO_MAX_FRAME)
179		vbibufs = VIDEO_MAX_FRAME;
180	return 0;
181}
182
183int saa7134_vbi_fini(struct saa7134_dev *dev)
184{
185	/* nothing */
186	timer_delete_sync(&dev->vbi_q.timeout);
187	return 0;
188}
189
190void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
191{
192	spin_lock(&dev->slock);
193	if (dev->vbi_q.curr) {
194		/* make sure we have seen both fields */
195		if ((status & 0x10) == 0x00) {
196			dev->vbi_q.curr->top_seen = 1;
197			goto done;
198		}
199		if (!dev->vbi_q.curr->top_seen)
200			goto done;
201
202		saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
203	}
204	saa7134_buffer_next(dev, &dev->vbi_q);
205
206 done:
207	spin_unlock(&dev->slock);
208}