4d36586ad752bd48159fcdfa6d2480eadb4844db
[sfrench/cifs-2.6.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  *  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 "saa7134.h"
24 #include "saa7134-reg.h"
25
26 #include <linux/init.h>
27 #include <linux/list.h>
28 #include <linux/module.h>
29 #include <linux/kernel.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 vbi_dbg(fmt, arg...) do { \
42         if (vbi_debug) \
43                 printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \
44         } while (0)
45
46 /* ------------------------------------------------------------------ */
47
48 #define VBI_LINE_COUNT     17
49 #define VBI_LINE_LENGTH  2048
50 #define VBI_SCALE       0x200
51
52 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
53                       int task)
54 {
55         struct saa7134_tvnorm *norm = dev->tvnorm;
56
57         /* setup video scaler */
58         saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
59         saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
60         saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
61         saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
62         saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
63         saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
64         saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
65         saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
66
67         saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
68         saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
69         saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
70         saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
71
72         saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff);
73         saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
74         saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
75         saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8);
76
77         saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
78 }
79
80 /* ------------------------------------------------------------------ */
81
82 static int buffer_activate(struct saa7134_dev *dev,
83                            struct saa7134_buf *buf,
84                            struct saa7134_buf *next)
85 {
86         struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_queue->drv_priv;
87         unsigned long control, base;
88
89         vbi_dbg("buffer_activate [%p]\n", buf);
90         buf->top_seen = 0;
91
92         task_init(dev, buf, TASK_A);
93         task_init(dev, buf, TASK_B);
94         saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
95         saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
96
97         /* DMA: setup channel 2+3 (= VBI Task A+B) */
98         base    = saa7134_buffer_base(buf);
99         control = SAA7134_RS_CONTROL_BURST_16 |
100                 SAA7134_RS_CONTROL_ME |
101                 (dmaq->pt.dma >> 12);
102         saa_writel(SAA7134_RS_BA1(2), base);
103         saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen);
104         saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
105         saa_writel(SAA7134_RS_CONTROL(2), control);
106         saa_writel(SAA7134_RS_BA1(3), base);
107         saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen);
108         saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
109         saa_writel(SAA7134_RS_CONTROL(3), control);
110
111         /* start DMA */
112         saa7134_set_dmabits(dev);
113         mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);
114
115         return 0;
116 }
117
118 static int buffer_prepare(struct vb2_buffer *vb2)
119 {
120         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
121         struct saa7134_dev *dev = dmaq->dev;
122         struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
123         struct sg_table *dma = vb2_dma_sg_plane_desc(&buf->vb2, 0);
124         unsigned int size;
125
126         if (dma->sgl->offset) {
127                 pr_err("The buffer is not page-aligned\n");
128                 return -EINVAL;
129         }
130         size = dev->vbi_hlen * dev->vbi_vlen * 2;
131         if (vb2_plane_size(vb2, 0) < size)
132                 return -EINVAL;
133
134         vb2_set_plane_payload(vb2, 0, size);
135
136         return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
137                                     saa7134_buffer_startpage(buf));
138 }
139
140 static int queue_setup(struct vb2_queue *q, const struct v4l2_format *fmt,
141                            unsigned int *nbuffers, unsigned int *nplanes,
142                            unsigned int sizes[], void *alloc_ctxs[])
143 {
144         struct saa7134_dmaqueue *dmaq = q->drv_priv;
145         struct saa7134_dev *dev = dmaq->dev;
146         unsigned int size;
147
148         dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
149         if (dev->vbi_vlen > VBI_LINE_COUNT)
150                 dev->vbi_vlen = VBI_LINE_COUNT;
151         dev->vbi_hlen = VBI_LINE_LENGTH;
152         size = dev->vbi_hlen * dev->vbi_vlen * 2;
153
154         *nbuffers = saa7134_buffer_count(size, *nbuffers);
155         *nplanes = 1;
156         sizes[0] = size;
157         alloc_ctxs[0] = dev->alloc_ctx;
158         return 0;
159 }
160
161 static int buffer_init(struct vb2_buffer *vb2)
162 {
163         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
164         struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
165
166         dmaq->curr = NULL;
167         buf->activate = buffer_activate;
168         return 0;
169 }
170
171 struct vb2_ops saa7134_vbi_qops = {
172         .queue_setup    = queue_setup,
173         .buf_init       = buffer_init,
174         .buf_prepare    = buffer_prepare,
175         .buf_queue      = saa7134_vb2_buffer_queue,
176         .wait_prepare   = vb2_ops_wait_prepare,
177         .wait_finish    = vb2_ops_wait_finish,
178         .start_streaming = saa7134_vb2_start_streaming,
179         .stop_streaming = saa7134_vb2_stop_streaming,
180 };
181
182 /* ------------------------------------------------------------------ */
183
184 int saa7134_vbi_init1(struct saa7134_dev *dev)
185 {
186         INIT_LIST_HEAD(&dev->vbi_q.queue);
187         init_timer(&dev->vbi_q.timeout);
188         dev->vbi_q.timeout.function = saa7134_buffer_timeout;
189         dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
190         dev->vbi_q.dev              = dev;
191
192         if (vbibufs < 2)
193                 vbibufs = 2;
194         if (vbibufs > VIDEO_MAX_FRAME)
195                 vbibufs = VIDEO_MAX_FRAME;
196         return 0;
197 }
198
199 int saa7134_vbi_fini(struct saa7134_dev *dev)
200 {
201         /* nothing */
202         return 0;
203 }
204
205 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
206 {
207         spin_lock(&dev->slock);
208         if (dev->vbi_q.curr) {
209                 /* make sure we have seen both fields */
210                 if ((status & 0x10) == 0x00) {
211                         dev->vbi_q.curr->top_seen = 1;
212                         goto done;
213                 }
214                 if (!dev->vbi_q.curr->top_seen)
215                         goto done;
216
217                 saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
218         }
219         saa7134_buffer_next(dev, &dev->vbi_q);
220
221  done:
222         spin_unlock(&dev->slock);
223 }