Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[muen/linux.git] / drivers / media / pci / saa7134 / saa7134-vbi.c
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 }