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), 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 int ret; 124 125 if (dma->sgl->offset) { 126 pr_err("The buffer is not page-aligned\n"); 127 return -EINVAL; 128 } 129 size = dev->vbi_hlen * dev->vbi_vlen * 2; 130 if (vb2_plane_size(vb2, 0) < size) 131 return -EINVAL; 132 133 vb2_set_plane_payload(vb2, 0, size); 134 135 ret = dma_map_sg(&dev->pci->dev, dma->sgl, dma->nents, DMA_FROM_DEVICE); 136 if (!ret) 137 return -EIO; 138 return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents, 139 saa7134_buffer_startpage(buf)); 140 } 141 142 static int queue_setup(struct vb2_queue *q, const struct v4l2_format *fmt, 143 unsigned int *nbuffers, unsigned int *nplanes, 144 unsigned int sizes[], void *alloc_ctxs[]) 145 { 146 struct saa7134_dmaqueue *dmaq = q->drv_priv; 147 struct saa7134_dev *dev = dmaq->dev; 148 unsigned int size; 149 150 dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1; 151 if (dev->vbi_vlen > VBI_LINE_COUNT) 152 dev->vbi_vlen = VBI_LINE_COUNT; 153 dev->vbi_hlen = VBI_LINE_LENGTH; 154 size = dev->vbi_hlen * dev->vbi_vlen * 2; 155 156 *nbuffers = saa7134_buffer_count(size, *nbuffers); 157 *nplanes = 1; 158 sizes[0] = size; 159 return 0; 160 } 161 162 static int buffer_init(struct vb2_buffer *vb2) 163 { 164 struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv; 165 struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2); 166 167 dmaq->curr = NULL; 168 buf->activate = buffer_activate; 169 return 0; 170 } 171 172 static void buffer_finish(struct vb2_buffer *vb2) 173 { 174 struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv; 175 struct saa7134_dev *dev = dmaq->dev; 176 struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2); 177 struct sg_table *dma = vb2_dma_sg_plane_desc(&buf->vb2, 0); 178 179 dma_unmap_sg(&dev->pci->dev, dma->sgl, dma->nents, DMA_FROM_DEVICE); 180 } 181 182 struct vb2_ops saa7134_vbi_qops = { 183 .queue_setup = queue_setup, 184 .buf_init = buffer_init, 185 .buf_prepare = buffer_prepare, 186 .buf_finish = buffer_finish, 187 .buf_queue = saa7134_vb2_buffer_queue, 188 .wait_prepare = vb2_ops_wait_prepare, 189 .wait_finish = vb2_ops_wait_finish, 190 .start_streaming = saa7134_vb2_start_streaming, 191 .stop_streaming = saa7134_vb2_stop_streaming, 192 }; 193 194 /* ------------------------------------------------------------------ */ 195 196 int saa7134_vbi_init1(struct saa7134_dev *dev) 197 { 198 INIT_LIST_HEAD(&dev->vbi_q.queue); 199 init_timer(&dev->vbi_q.timeout); 200 dev->vbi_q.timeout.function = saa7134_buffer_timeout; 201 dev->vbi_q.timeout.data = (unsigned long)(&dev->vbi_q); 202 dev->vbi_q.dev = dev; 203 204 if (vbibufs < 2) 205 vbibufs = 2; 206 if (vbibufs > VIDEO_MAX_FRAME) 207 vbibufs = VIDEO_MAX_FRAME; 208 return 0; 209 } 210 211 int saa7134_vbi_fini(struct saa7134_dev *dev) 212 { 213 /* nothing */ 214 return 0; 215 } 216 217 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status) 218 { 219 spin_lock(&dev->slock); 220 if (dev->vbi_q.curr) { 221 /* make sure we have seen both fields */ 222 if ((status & 0x10) == 0x00) { 223 dev->vbi_q.curr->top_seen = 1; 224 goto done; 225 } 226 if (!dev->vbi_q.curr->top_seen) 227 goto done; 228 229 saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE); 230 } 231 saa7134_buffer_next(dev, &dev->vbi_q); 232 233 done: 234 spin_unlock(&dev->slock); 235 } 236