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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 *4 * device driver for philips saa7134 based TV cards5 * video4linux video interface6 *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 20static unsigned int vbi_debug;21module_param(vbi_debug, int, 0644);22MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");23 24static unsigned int vbibufs = 4;25module_param(vbibufs, int, 0444);26MODULE_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 1736#define VBI_LINE_LENGTH 204837#define VBI_SCALE 0x20038 39static 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 69static 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 105static 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 128static 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 148static 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 159const 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 172int 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 185int saa7134_vbi_fini(struct saa7134_dev *dev)186{187 /* nothing */188 del_timer_sync(&dev->vbi_q.timeout);189 return 0;190}191 192void 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