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 16 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), buf->vb.width & 0xff); 71 saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width >> 8); 72 saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height & 0xff); 73 saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height >> 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 unsigned long control,base; 85 86 dprintk("buffer_activate [%p]\n",buf); 87 buf->vb.state = VIDEOBUF_ACTIVE; 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 (buf->pt->dma >> 12); 100 saa_writel(SAA7134_RS_BA1(2),base); 101 saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2); 102 saa_writel(SAA7134_RS_PITCH(2),buf->vb.width); 103 saa_writel(SAA7134_RS_CONTROL(2),control); 104 saa_writel(SAA7134_RS_BA1(3),base); 105 saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2); 106 saa_writel(SAA7134_RS_PITCH(3),buf->vb.width); 107 saa_writel(SAA7134_RS_CONTROL(3),control); 108 109 /* start DMA */ 110 saa7134_set_dmabits(dev); 111 mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT); 112 113 return 0; 114 } 115 116 static int buffer_prepare(struct videobuf_queue *q, 117 struct videobuf_buffer *vb, 118 enum v4l2_field field) 119 { 120 struct saa7134_dev *dev = q->priv_data; 121 struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb); 122 struct saa7134_tvnorm *norm = dev->tvnorm; 123 unsigned int lines, llength, size; 124 int err; 125 126 lines = norm->vbi_v_stop_0 - norm->vbi_v_start_0 +1; 127 if (lines > VBI_LINE_COUNT) 128 lines = VBI_LINE_COUNT; 129 llength = VBI_LINE_LENGTH; 130 size = lines * llength * 2; 131 if (0 != buf->vb.baddr && buf->vb.bsize < size) 132 return -EINVAL; 133 134 if (buf->vb.size != size) 135 saa7134_dma_free(q,buf); 136 137 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) { 138 struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb); 139 140 buf->vb.width = llength; 141 buf->vb.height = lines; 142 buf->vb.size = size; 143 buf->pt = &dev->pt_vbi; 144 145 err = videobuf_iolock(q,&buf->vb,NULL); 146 if (err) 147 goto oops; 148 err = saa7134_pgtable_build(dev->pci,buf->pt, 149 dma->sglist, 150 dma->sglen, 151 saa7134_buffer_startpage(buf)); 152 if (err) 153 goto oops; 154 } 155 buf->vb.state = VIDEOBUF_PREPARED; 156 buf->activate = buffer_activate; 157 buf->vb.field = field; 158 return 0; 159 160 oops: 161 saa7134_dma_free(q,buf); 162 return err; 163 } 164 165 static int 166 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size) 167 { 168 struct saa7134_dev *dev = q->priv_data; 169 int llength,lines; 170 171 lines = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 +1; 172 llength = VBI_LINE_LENGTH; 173 *size = lines * llength * 2; 174 if (0 == *count) 175 *count = vbibufs; 176 *count = saa7134_buffer_count(*size,*count); 177 return 0; 178 } 179 180 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb) 181 { 182 struct saa7134_dev *dev = q->priv_data; 183 struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb); 184 185 saa7134_buffer_queue(dev,&dev->vbi_q,buf); 186 } 187 188 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb) 189 { 190 struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb); 191 192 saa7134_dma_free(q,buf); 193 } 194 195 struct videobuf_queue_ops saa7134_vbi_qops = { 196 .buf_setup = buffer_setup, 197 .buf_prepare = buffer_prepare, 198 .buf_queue = buffer_queue, 199 .buf_release = buffer_release, 200 }; 201 202 /* ------------------------------------------------------------------ */ 203 204 int saa7134_vbi_init1(struct saa7134_dev *dev) 205 { 206 INIT_LIST_HEAD(&dev->vbi_q.queue); 207 init_timer(&dev->vbi_q.timeout); 208 dev->vbi_q.timeout.function = saa7134_buffer_timeout; 209 dev->vbi_q.timeout.data = (unsigned long)(&dev->vbi_q); 210 dev->vbi_q.dev = dev; 211 212 if (vbibufs < 2) 213 vbibufs = 2; 214 if (vbibufs > VIDEO_MAX_FRAME) 215 vbibufs = VIDEO_MAX_FRAME; 216 return 0; 217 } 218 219 int saa7134_vbi_fini(struct saa7134_dev *dev) 220 { 221 /* nothing */ 222 return 0; 223 } 224 225 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status) 226 { 227 spin_lock(&dev->slock); 228 if (dev->vbi_q.curr) { 229 dev->vbi_fieldcount++; 230 /* make sure we have seen both fields */ 231 if ((status & 0x10) == 0x00) { 232 dev->vbi_q.curr->top_seen = 1; 233 goto done; 234 } 235 if (!dev->vbi_q.curr->top_seen) 236 goto done; 237 238 dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount; 239 saa7134_buffer_finish(dev,&dev->vbi_q,VIDEOBUF_DONE); 240 } 241 saa7134_buffer_next(dev,&dev->vbi_q); 242 243 done: 244 spin_unlock(&dev->slock); 245 } 246 247 /* ----------------------------------------------------------- */ 248 /* 249 * Local variables: 250 * c-basic-offset: 8 251 * End: 252 */ 253