1 /*
2  *
3  * device driver for philips saa7134 based TV cards
4  * video4linux video interface
5  *
6  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  */
18 
19 #include "saa7134.h"
20 #include "saa7134-reg.h"
21 
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 
27 /* ------------------------------------------------------------------ */
28 
29 static unsigned int vbi_debug;
30 module_param(vbi_debug, int, 0644);
31 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
32 
33 static unsigned int vbibufs = 4;
34 module_param(vbibufs, int, 0444);
35 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
36 
37 #define vbi_dbg(fmt, arg...) do { \
38 	if (vbi_debug) \
39 		printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \
40 	} while (0)
41 
42 /* ------------------------------------------------------------------ */
43 
44 #define VBI_LINE_COUNT     17
45 #define VBI_LINE_LENGTH  2048
46 #define VBI_SCALE       0x200
47 
48 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
49 		      int task)
50 {
51 	struct saa7134_tvnorm *norm = dev->tvnorm;
52 
53 	/* setup video scaler */
54 	saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
55 	saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
56 	saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
57 	saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
58 	saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
59 	saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
60 	saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
61 	saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
62 
63 	saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
64 	saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
65 	saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
66 	saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
67 
68 	saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff);
69 	saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
70 	saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
71 	saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8);
72 
73 	saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
74 }
75 
76 /* ------------------------------------------------------------------ */
77 
78 static int buffer_activate(struct saa7134_dev *dev,
79 			   struct saa7134_buf *buf,
80 			   struct saa7134_buf *next)
81 {
82 	struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_buf.vb2_queue->drv_priv;
83 	unsigned long control, base;
84 
85 	vbi_dbg("buffer_activate [%p]\n", buf);
86 	buf->top_seen = 0;
87 
88 	task_init(dev, buf, TASK_A);
89 	task_init(dev, buf, TASK_B);
90 	saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
91 	saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
92 
93 	/* DMA: setup channel 2+3 (= VBI Task A+B) */
94 	base    = saa7134_buffer_base(buf);
95 	control = SAA7134_RS_CONTROL_BURST_16 |
96 		SAA7134_RS_CONTROL_ME |
97 		(dmaq->pt.dma >> 12);
98 	saa_writel(SAA7134_RS_BA1(2), base);
99 	saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen);
100 	saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
101 	saa_writel(SAA7134_RS_CONTROL(2), control);
102 	saa_writel(SAA7134_RS_BA1(3), base);
103 	saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen);
104 	saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
105 	saa_writel(SAA7134_RS_CONTROL(3), control);
106 
107 	/* start DMA */
108 	saa7134_set_dmabits(dev);
109 	mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);
110 
111 	return 0;
112 }
113 
114 static int buffer_prepare(struct vb2_buffer *vb2)
115 {
116 	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
117 	struct saa7134_dev *dev = dmaq->dev;
118 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
119 	struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
120 	struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0);
121 	unsigned int size;
122 
123 	if (dma->sgl->offset) {
124 		pr_err("The buffer is not page-aligned\n");
125 		return -EINVAL;
126 	}
127 	size = dev->vbi_hlen * dev->vbi_vlen * 2;
128 	if (vb2_plane_size(vb2, 0) < size)
129 		return -EINVAL;
130 
131 	vb2_set_plane_payload(vb2, 0, size);
132 
133 	return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
134 				    saa7134_buffer_startpage(buf));
135 }
136 
137 static int queue_setup(struct vb2_queue *q,
138 			   unsigned int *nbuffers, unsigned int *nplanes,
139 			   unsigned int sizes[], struct device *alloc_devs[])
140 {
141 	struct saa7134_dmaqueue *dmaq = q->drv_priv;
142 	struct saa7134_dev *dev = dmaq->dev;
143 	unsigned int size;
144 
145 	dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
146 	if (dev->vbi_vlen > VBI_LINE_COUNT)
147 		dev->vbi_vlen = VBI_LINE_COUNT;
148 	dev->vbi_hlen = VBI_LINE_LENGTH;
149 	size = dev->vbi_hlen * dev->vbi_vlen * 2;
150 
151 	*nbuffers = saa7134_buffer_count(size, *nbuffers);
152 	*nplanes = 1;
153 	sizes[0] = size;
154 	return 0;
155 }
156 
157 static int buffer_init(struct vb2_buffer *vb2)
158 {
159 	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
160 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
161 	struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
162 
163 	dmaq->curr = NULL;
164 	buf->activate = buffer_activate;
165 	return 0;
166 }
167 
168 const struct vb2_ops saa7134_vbi_qops = {
169 	.queue_setup	= queue_setup,
170 	.buf_init	= buffer_init,
171 	.buf_prepare	= buffer_prepare,
172 	.buf_queue	= saa7134_vb2_buffer_queue,
173 	.wait_prepare	= vb2_ops_wait_prepare,
174 	.wait_finish	= vb2_ops_wait_finish,
175 	.start_streaming = saa7134_vb2_start_streaming,
176 	.stop_streaming = saa7134_vb2_stop_streaming,
177 };
178 
179 /* ------------------------------------------------------------------ */
180 
181 int saa7134_vbi_init1(struct saa7134_dev *dev)
182 {
183 	INIT_LIST_HEAD(&dev->vbi_q.queue);
184 	timer_setup(&dev->vbi_q.timeout, saa7134_buffer_timeout, 0);
185 	dev->vbi_q.dev              = dev;
186 
187 	if (vbibufs < 2)
188 		vbibufs = 2;
189 	if (vbibufs > VIDEO_MAX_FRAME)
190 		vbibufs = VIDEO_MAX_FRAME;
191 	return 0;
192 }
193 
194 int saa7134_vbi_fini(struct saa7134_dev *dev)
195 {
196 	/* nothing */
197 	return 0;
198 }
199 
200 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
201 {
202 	spin_lock(&dev->slock);
203 	if (dev->vbi_q.curr) {
204 		/* make sure we have seen both fields */
205 		if ((status & 0x10) == 0x00) {
206 			dev->vbi_q.curr->top_seen = 1;
207 			goto done;
208 		}
209 		if (!dev->vbi_q.curr->top_seen)
210 			goto done;
211 
212 		saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
213 	}
214 	saa7134_buffer_next(dev, &dev->vbi_q);
215 
216  done:
217 	spin_unlock(&dev->slock);
218 }
219