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 	return 0;
189 }
190 
191 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
192 {
193 	spin_lock(&dev->slock);
194 	if (dev->vbi_q.curr) {
195 		/* make sure we have seen both fields */
196 		if ((status & 0x10) == 0x00) {
197 			dev->vbi_q.curr->top_seen = 1;
198 			goto done;
199 		}
200 		if (!dev->vbi_q.curr->top_seen)
201 			goto done;
202 
203 		saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
204 	}
205 	saa7134_buffer_next(dev, &dev->vbi_q);
206 
207  done:
208 	spin_unlock(&dev->slock);
209 }
210