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
20 static unsigned int vbi_debug;
21 module_param(vbi_debug, int, 0644);
22 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
23
24 static unsigned int vbibufs = 4;
25 module_param(vbibufs, int, 0444);
26 MODULE_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
task_init(struct saa7134_dev * dev,struct saa7134_buf * buf,int task)39 static 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
buffer_activate(struct saa7134_dev * dev,struct saa7134_buf * buf,struct saa7134_buf * next)69 static 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
buffer_prepare(struct vb2_buffer * vb2)105 static 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
queue_setup(struct vb2_queue * q,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])128 static 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
buffer_init(struct vb2_buffer * vb2)148 static 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
159 const 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 .wait_prepare = vb2_ops_wait_prepare,
165 .wait_finish = vb2_ops_wait_finish,
166 .start_streaming = saa7134_vb2_start_streaming,
167 .stop_streaming = saa7134_vb2_stop_streaming,
168 };
169
170 /* ------------------------------------------------------------------ */
171
saa7134_vbi_init1(struct saa7134_dev * dev)172 int saa7134_vbi_init1(struct saa7134_dev *dev)
173 {
174 INIT_LIST_HEAD(&dev->vbi_q.queue);
175 timer_setup(&dev->vbi_q.timeout, saa7134_buffer_timeout, 0);
176 dev->vbi_q.dev = dev;
177
178 if (vbibufs < 2)
179 vbibufs = 2;
180 if (vbibufs > VIDEO_MAX_FRAME)
181 vbibufs = VIDEO_MAX_FRAME;
182 return 0;
183 }
184
saa7134_vbi_fini(struct saa7134_dev * dev)185 int saa7134_vbi_fini(struct saa7134_dev *dev)
186 {
187 /* nothing */
188 del_timer_sync(&dev->vbi_q.timeout);
189 return 0;
190 }
191
saa7134_irq_vbi_done(struct saa7134_dev * dev,unsigned long status)192 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
193 {
194 spin_lock(&dev->slock);
195 if (dev->vbi_q.curr) {
196 /* make sure we have seen both fields */
197 if ((status & 0x10) == 0x00) {
198 dev->vbi_q.curr->top_seen = 1;
199 goto done;
200 }
201 if (!dev->vbi_q.curr->top_seen)
202 goto done;
203
204 saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
205 }
206 saa7134_buffer_next(dev, &dev->vbi_q);
207
208 done:
209 spin_unlock(&dev->slock);
210 }
211