1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * 4 * device driver for philips saa7134 based TV cards 5 * video4linux video interface 6 * 7 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs] 8 */ 9 10 #include "saa7134.h" 11 #include "saa7134-reg.h" 12 13 #include <linux/init.h> 14 #include <linux/list.h> 15 #include <linux/module.h> 16 #include <linux/kernel.h> 17 18 /* ------------------------------------------------------------------ */ 19 20 static unsigned int vbi_debug; 21 module_param(vbi_debug, int, 0644); 22 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]"); 23 24 static unsigned int vbibufs = 4; 25 module_param(vbibufs, int, 0444); 26 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32"); 27 28 #define vbi_dbg(fmt, arg...) do { \ 29 if (vbi_debug) \ 30 printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \ 31 } while (0) 32 33 /* ------------------------------------------------------------------ */ 34 35 #define VBI_LINE_COUNT 17 36 #define VBI_LINE_LENGTH 2048 37 #define VBI_SCALE 0x200 38 39 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf, 40 int task) 41 { 42 struct saa7134_tvnorm *norm = dev->tvnorm; 43 44 /* setup video scaler */ 45 saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start & 0xff); 46 saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start >> 8); 47 saa_writeb(SAA7134_VBI_H_STOP1(task), norm->h_stop & 0xff); 48 saa_writeb(SAA7134_VBI_H_STOP2(task), norm->h_stop >> 8); 49 saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 & 0xff); 50 saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8); 51 saa_writeb(SAA7134_VBI_V_STOP1(task), norm->vbi_v_stop_0 & 0xff); 52 saa_writeb(SAA7134_VBI_V_STOP2(task), norm->vbi_v_stop_0 >> 8); 53 54 saa_writeb(SAA7134_VBI_H_SCALE_INC1(task), VBI_SCALE & 0xff); 55 saa_writeb(SAA7134_VBI_H_SCALE_INC2(task), VBI_SCALE >> 8); 56 saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task), 0x00); 57 saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00); 58 59 saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff); 60 saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8); 61 saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff); 62 saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8); 63 64 saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00); 65 } 66 67 /* ------------------------------------------------------------------ */ 68 69 static int buffer_activate(struct saa7134_dev *dev, 70 struct saa7134_buf *buf, 71 struct saa7134_buf *next) 72 { 73 struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_buf.vb2_queue->drv_priv; 74 unsigned long control, base; 75 76 vbi_dbg("buffer_activate [%p]\n", buf); 77 buf->top_seen = 0; 78 79 task_init(dev, buf, TASK_A); 80 task_init(dev, buf, TASK_B); 81 saa_writeb(SAA7134_OFMT_DATA_A, 0x06); 82 saa_writeb(SAA7134_OFMT_DATA_B, 0x06); 83 84 /* DMA: setup channel 2+3 (= VBI Task A+B) */ 85 base = saa7134_buffer_base(buf); 86 control = SAA7134_RS_CONTROL_BURST_16 | 87 SAA7134_RS_CONTROL_ME | 88 (dmaq->pt.dma >> 12); 89 saa_writel(SAA7134_RS_BA1(2), base); 90 saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen); 91 saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen); 92 saa_writel(SAA7134_RS_CONTROL(2), control); 93 saa_writel(SAA7134_RS_BA1(3), base); 94 saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen); 95 saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen); 96 saa_writel(SAA7134_RS_CONTROL(3), control); 97 98 /* start DMA */ 99 saa7134_set_dmabits(dev); 100 mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT); 101 102 return 0; 103 } 104 105 static int buffer_prepare(struct vb2_buffer *vb2) 106 { 107 struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv; 108 struct saa7134_dev *dev = dmaq->dev; 109 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2); 110 struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2); 111 struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0); 112 unsigned int size; 113 114 if (dma->sgl->offset) { 115 pr_err("The buffer is not page-aligned\n"); 116 return -EINVAL; 117 } 118 size = dev->vbi_hlen * dev->vbi_vlen * 2; 119 if (vb2_plane_size(vb2, 0) < size) 120 return -EINVAL; 121 122 vb2_set_plane_payload(vb2, 0, size); 123 124 return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents, 125 saa7134_buffer_startpage(buf)); 126 } 127 128 static int queue_setup(struct vb2_queue *q, 129 unsigned int *nbuffers, unsigned int *nplanes, 130 unsigned int sizes[], struct device *alloc_devs[]) 131 { 132 struct saa7134_dmaqueue *dmaq = q->drv_priv; 133 struct saa7134_dev *dev = dmaq->dev; 134 unsigned int size; 135 136 dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1; 137 if (dev->vbi_vlen > VBI_LINE_COUNT) 138 dev->vbi_vlen = VBI_LINE_COUNT; 139 dev->vbi_hlen = VBI_LINE_LENGTH; 140 size = dev->vbi_hlen * dev->vbi_vlen * 2; 141 142 *nbuffers = saa7134_buffer_count(size, *nbuffers); 143 *nplanes = 1; 144 sizes[0] = size; 145 return 0; 146 } 147 148 static int buffer_init(struct vb2_buffer *vb2) 149 { 150 struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv; 151 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2); 152 struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2); 153 154 dmaq->curr = NULL; 155 buf->activate = buffer_activate; 156 return 0; 157 } 158 159 const struct vb2_ops saa7134_vbi_qops = { 160 .queue_setup = queue_setup, 161 .buf_init = buffer_init, 162 .buf_prepare = buffer_prepare, 163 .buf_queue = saa7134_vb2_buffer_queue, 164 .wait_prepare = vb2_ops_wait_prepare, 165 .wait_finish = vb2_ops_wait_finish, 166 .start_streaming = saa7134_vb2_start_streaming, 167 .stop_streaming = saa7134_vb2_stop_streaming, 168 }; 169 170 /* ------------------------------------------------------------------ */ 171 172 int saa7134_vbi_init1(struct saa7134_dev *dev) 173 { 174 INIT_LIST_HEAD(&dev->vbi_q.queue); 175 timer_setup(&dev->vbi_q.timeout, saa7134_buffer_timeout, 0); 176 dev->vbi_q.dev = dev; 177 178 if (vbibufs < 2) 179 vbibufs = 2; 180 if (vbibufs > VIDEO_MAX_FRAME) 181 vbibufs = VIDEO_MAX_FRAME; 182 return 0; 183 } 184 185 int saa7134_vbi_fini(struct saa7134_dev *dev) 186 { 187 /* nothing */ 188 del_timer_sync(&dev->vbi_q.timeout); 189 return 0; 190 } 191 192 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status) 193 { 194 spin_lock(&dev->slock); 195 if (dev->vbi_q.curr) { 196 /* make sure we have seen both fields */ 197 if ((status & 0x10) == 0x00) { 198 dev->vbi_q.curr->top_seen = 1; 199 goto done; 200 } 201 if (!dev->vbi_q.curr->top_seen) 202 goto done; 203 204 saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE); 205 } 206 saa7134_buffer_next(dev, &dev->vbi_q); 207 208 done: 209 spin_unlock(&dev->slock); 210 } 211