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  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22 
23 #include <linux/init.h>
24 #include <linux/list.h>
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 
28 #include "saa7134-reg.h"
29 #include "saa7134.h"
30 
31 /* ------------------------------------------------------------------ */
32 
33 static unsigned int vbi_debug;
34 module_param(vbi_debug, int, 0644);
35 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
36 
37 static unsigned int vbibufs = 4;
38 module_param(vbibufs, int, 0444);
39 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
40 
41 #define dprintk(fmt, arg...)	if (vbi_debug) \
42 	printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
43 
44 /* ------------------------------------------------------------------ */
45 
46 #define VBI_LINE_COUNT     17
47 #define VBI_LINE_LENGTH  2048
48 #define VBI_SCALE       0x200
49 
50 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
51 		      int task)
52 {
53 	struct saa7134_tvnorm *norm = dev->tvnorm;
54 
55 	/* setup video scaler */
56 	saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
57 	saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
58 	saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
59 	saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
60 	saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
61 	saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
62 	saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
63 	saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
64 
65 	saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
66 	saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
67 	saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
68 	saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
69 
70 	saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff);
71 	saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
72 	saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
73 	saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8);
74 
75 	saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
76 }
77 
78 /* ------------------------------------------------------------------ */
79 
80 static int buffer_activate(struct saa7134_dev *dev,
81 			   struct saa7134_buf *buf,
82 			   struct saa7134_buf *next)
83 {
84 	struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_queue->drv_priv;
85 	unsigned long control, base;
86 
87 	dprintk("buffer_activate [%p]\n", buf);
88 	buf->top_seen = 0;
89 
90 	task_init(dev, buf, TASK_A);
91 	task_init(dev, buf, TASK_B);
92 	saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
93 	saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
94 
95 	/* DMA: setup channel 2+3 (= VBI Task A+B) */
96 	base    = saa7134_buffer_base(buf);
97 	control = SAA7134_RS_CONTROL_BURST_16 |
98 		SAA7134_RS_CONTROL_ME |
99 		(dmaq->pt.dma >> 12);
100 	saa_writel(SAA7134_RS_BA1(2), base);
101 	saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen);
102 	saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
103 	saa_writel(SAA7134_RS_CONTROL(2), control);
104 	saa_writel(SAA7134_RS_BA1(3), base);
105 	saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen);
106 	saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
107 	saa_writel(SAA7134_RS_CONTROL(3), control);
108 
109 	/* start DMA */
110 	saa7134_set_dmabits(dev);
111 	mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);
112 
113 	return 0;
114 }
115 
116 static int buffer_prepare(struct vb2_buffer *vb2)
117 {
118 	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
119 	struct saa7134_dev *dev = dmaq->dev;
120 	struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
121 	struct sg_table *dma = vb2_dma_sg_plane_desc(&buf->vb2, 0);
122 	unsigned int size;
123 
124 	if (dma->sgl->offset) {
125 		pr_err("The buffer is not page-aligned\n");
126 		return -EINVAL;
127 	}
128 	size = dev->vbi_hlen * dev->vbi_vlen * 2;
129 	if (vb2_plane_size(vb2, 0) < size)
130 		return -EINVAL;
131 
132 	vb2_set_plane_payload(vb2, 0, size);
133 
134 	return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
135 				    saa7134_buffer_startpage(buf));
136 }
137 
138 static int queue_setup(struct vb2_queue *q, const struct v4l2_format *fmt,
139 			   unsigned int *nbuffers, unsigned int *nplanes,
140 			   unsigned int sizes[], void *alloc_ctxs[])
141 {
142 	struct saa7134_dmaqueue *dmaq = q->drv_priv;
143 	struct saa7134_dev *dev = dmaq->dev;
144 	unsigned int size;
145 
146 	dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
147 	if (dev->vbi_vlen > VBI_LINE_COUNT)
148 		dev->vbi_vlen = VBI_LINE_COUNT;
149 	dev->vbi_hlen = VBI_LINE_LENGTH;
150 	size = dev->vbi_hlen * dev->vbi_vlen * 2;
151 
152 	*nbuffers = saa7134_buffer_count(size, *nbuffers);
153 	*nplanes = 1;
154 	sizes[0] = size;
155 	alloc_ctxs[0] = dev->alloc_ctx;
156 	return 0;
157 }
158 
159 static int buffer_init(struct vb2_buffer *vb2)
160 {
161 	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
162 	struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
163 
164 	dmaq->curr = NULL;
165 	buf->activate = buffer_activate;
166 	return 0;
167 }
168 
169 struct vb2_ops saa7134_vbi_qops = {
170 	.queue_setup	= queue_setup,
171 	.buf_init	= buffer_init,
172 	.buf_prepare	= buffer_prepare,
173 	.buf_queue	= saa7134_vb2_buffer_queue,
174 	.wait_prepare	= vb2_ops_wait_prepare,
175 	.wait_finish	= vb2_ops_wait_finish,
176 	.start_streaming = saa7134_vb2_start_streaming,
177 	.stop_streaming = saa7134_vb2_stop_streaming,
178 };
179 
180 /* ------------------------------------------------------------------ */
181 
182 int saa7134_vbi_init1(struct saa7134_dev *dev)
183 {
184 	INIT_LIST_HEAD(&dev->vbi_q.queue);
185 	init_timer(&dev->vbi_q.timeout);
186 	dev->vbi_q.timeout.function = saa7134_buffer_timeout;
187 	dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
188 	dev->vbi_q.dev              = dev;
189 
190 	if (vbibufs < 2)
191 		vbibufs = 2;
192 	if (vbibufs > VIDEO_MAX_FRAME)
193 		vbibufs = VIDEO_MAX_FRAME;
194 	return 0;
195 }
196 
197 int saa7134_vbi_fini(struct saa7134_dev *dev)
198 {
199 	/* nothing */
200 	return 0;
201 }
202 
203 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
204 {
205 	spin_lock(&dev->slock);
206 	if (dev->vbi_q.curr) {
207 		/* make sure we have seen both fields */
208 		if ((status & 0x10) == 0x00) {
209 			dev->vbi_q.curr->top_seen = 1;
210 			goto done;
211 		}
212 		if (!dev->vbi_q.curr->top_seen)
213 			goto done;
214 
215 		saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
216 	}
217 	saa7134_buffer_next(dev, &dev->vbi_q);
218 
219  done:
220 	spin_unlock(&dev->slock);
221 }
222