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(timer: &dmaq->timeout, expires: 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(vb: vb2, plane_no: 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(vb: vb2, plane_no: 0) < size)
120 return -EINVAL;
121
122 vb2_set_plane_payload(vb: vb2, plane_no: 0, size);
123
124 return saa7134_pgtable_build(pci: dev->pci, pt: &dmaq->pt, list: dma->sgl, length: dma->nents,
125 startpage: 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, count: *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(list: &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(timer: &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(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, q: &dev->vbi_q, state: VB2_BUF_STATE_DONE);
203 }
204 saa7134_buffer_next(dev, q: &dev->vbi_q);
205
206 done:
207 spin_unlock(lock: &dev->slock);
208}
209

source code of linux/drivers/media/pci/saa7134/saa7134-vbi.c