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_buf.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 vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2); 123 struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2); 124 struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0); 125 unsigned int size; 126 127 if (dma->sgl->offset) { 128 pr_err("The buffer is not page-aligned\n"); 129 return -EINVAL; 130 } 131 size = dev->vbi_hlen * dev->vbi_vlen * 2; 132 if (vb2_plane_size(vb2, 0) < size) 133 return -EINVAL; 134 135 vb2_set_plane_payload(vb2, 0, size); 136 137 return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents, 138 saa7134_buffer_startpage(buf)); 139 } 140 141 static int queue_setup(struct vb2_queue *q, 142 unsigned int *nbuffers, unsigned int *nplanes, 143 unsigned int sizes[], void *alloc_ctxs[]) 144 { 145 struct saa7134_dmaqueue *dmaq = q->drv_priv; 146 struct saa7134_dev *dev = dmaq->dev; 147 unsigned int size; 148 149 dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1; 150 if (dev->vbi_vlen > VBI_LINE_COUNT) 151 dev->vbi_vlen = VBI_LINE_COUNT; 152 dev->vbi_hlen = VBI_LINE_LENGTH; 153 size = dev->vbi_hlen * dev->vbi_vlen * 2; 154 155 *nbuffers = saa7134_buffer_count(size, *nbuffers); 156 *nplanes = 1; 157 sizes[0] = size; 158 alloc_ctxs[0] = dev->alloc_ctx; 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 vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2); 166 struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2); 167 168 dmaq->curr = NULL; 169 buf->activate = buffer_activate; 170 return 0; 171 } 172 173 struct vb2_ops saa7134_vbi_qops = { 174 .queue_setup = queue_setup, 175 .buf_init = buffer_init, 176 .buf_prepare = buffer_prepare, 177 .buf_queue = saa7134_vb2_buffer_queue, 178 .wait_prepare = vb2_ops_wait_prepare, 179 .wait_finish = vb2_ops_wait_finish, 180 .start_streaming = saa7134_vb2_start_streaming, 181 .stop_streaming = saa7134_vb2_stop_streaming, 182 }; 183 184 /* ------------------------------------------------------------------ */ 185 186 int saa7134_vbi_init1(struct saa7134_dev *dev) 187 { 188 INIT_LIST_HEAD(&dev->vbi_q.queue); 189 init_timer(&dev->vbi_q.timeout); 190 dev->vbi_q.timeout.function = saa7134_buffer_timeout; 191 dev->vbi_q.timeout.data = (unsigned long)(&dev->vbi_q); 192 dev->vbi_q.dev = dev; 193 194 if (vbibufs < 2) 195 vbibufs = 2; 196 if (vbibufs > VIDEO_MAX_FRAME) 197 vbibufs = VIDEO_MAX_FRAME; 198 return 0; 199 } 200 201 int saa7134_vbi_fini(struct saa7134_dev *dev) 202 { 203 /* nothing */ 204 return 0; 205 } 206 207 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status) 208 { 209 spin_lock(&dev->slock); 210 if (dev->vbi_q.curr) { 211 /* make sure we have seen both fields */ 212 if ((status & 0x10) == 0x00) { 213 dev->vbi_q.curr->top_seen = 1; 214 goto done; 215 } 216 if (!dev->vbi_q.curr->top_seen) 217 goto done; 218 219 saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE); 220 } 221 saa7134_buffer_next(dev, &dev->vbi_q); 222 223 done: 224 spin_unlock(&dev->slock); 225 } 226