xref: /openbmc/linux/drivers/media/pci/cx88/cx88-vbi.c (revision 6f219760)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  */
4 
5 #include "cx88.h"
6 
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/init.h>
10 
11 static unsigned int vbi_debug;
12 module_param(vbi_debug, int, 0644);
13 MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");
14 
15 #define dprintk(level, fmt, arg...) do {			\
16 	if (vbi_debug >= level)					\
17 		printk(KERN_DEBUG pr_fmt("%s: vbi:" fmt),	\
18 			__func__, ##arg);			\
19 } while (0)
20 
21 /* ------------------------------------------------------------------ */
22 
cx8800_vbi_fmt(struct file * file,void * priv,struct v4l2_format * f)23 int cx8800_vbi_fmt(struct file *file, void *priv,
24 		   struct v4l2_format *f)
25 {
26 	struct cx8800_dev *dev = video_drvdata(file);
27 
28 	f->fmt.vbi.samples_per_line = VBI_LINE_LENGTH;
29 	f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
30 	f->fmt.vbi.offset = 244;
31 
32 	if (dev->core->tvnorm & V4L2_STD_525_60) {
33 		/* ntsc */
34 		f->fmt.vbi.sampling_rate = 28636363;
35 		f->fmt.vbi.start[0] = 10;
36 		f->fmt.vbi.start[1] = 273;
37 		f->fmt.vbi.count[0] = VBI_LINE_NTSC_COUNT;
38 		f->fmt.vbi.count[1] = VBI_LINE_NTSC_COUNT;
39 
40 	} else if (dev->core->tvnorm & V4L2_STD_625_50) {
41 		/* pal */
42 		f->fmt.vbi.sampling_rate = 35468950;
43 		f->fmt.vbi.start[0] = V4L2_VBI_ITU_625_F1_START + 5;
44 		f->fmt.vbi.start[1] = V4L2_VBI_ITU_625_F2_START + 5;
45 		f->fmt.vbi.count[0] = VBI_LINE_PAL_COUNT;
46 		f->fmt.vbi.count[1] = VBI_LINE_PAL_COUNT;
47 	}
48 	return 0;
49 }
50 
cx8800_start_vbi_dma(struct cx8800_dev * dev,struct cx88_dmaqueue * q,struct cx88_buffer * buf)51 static int cx8800_start_vbi_dma(struct cx8800_dev    *dev,
52 				struct cx88_dmaqueue *q,
53 				struct cx88_buffer   *buf)
54 {
55 	struct cx88_core *core = dev->core;
56 
57 	/* setup fifo + format */
58 	cx88_sram_channel_setup(dev->core, &cx88_sram_channels[SRAM_CH24],
59 				VBI_LINE_LENGTH, buf->risc.dma);
60 
61 	cx_write(MO_VBOS_CONTROL, (1 << 18) |  /* comb filter delay fixup */
62 				  (1 << 15) |  /* enable vbi capture */
63 				  (1 << 11));
64 
65 	/* reset counter */
66 	cx_write(MO_VBI_GPCNTRL, GP_COUNT_CONTROL_RESET);
67 	q->count = 0;
68 
69 	/* enable irqs */
70 	cx_set(MO_PCI_INTMSK, core->pci_irqmask | PCI_INT_VIDINT);
71 	cx_set(MO_VID_INTMSK, 0x0f0088);
72 
73 	/* enable capture */
74 	cx_set(VID_CAPTURE_CONTROL, 0x18);
75 
76 	/* start dma */
77 	cx_set(MO_DEV_CNTRL2, (1 << 5));
78 	cx_set(MO_VID_DMACNTRL, 0x88);
79 
80 	return 0;
81 }
82 
cx8800_stop_vbi_dma(struct cx8800_dev * dev)83 void cx8800_stop_vbi_dma(struct cx8800_dev *dev)
84 {
85 	struct cx88_core *core = dev->core;
86 
87 	/* stop dma */
88 	cx_clear(MO_VID_DMACNTRL, 0x88);
89 
90 	/* disable capture */
91 	cx_clear(VID_CAPTURE_CONTROL, 0x18);
92 
93 	/* disable irqs */
94 	cx_clear(MO_PCI_INTMSK, PCI_INT_VIDINT);
95 	cx_clear(MO_VID_INTMSK, 0x0f0088);
96 }
97 
cx8800_restart_vbi_queue(struct cx8800_dev * dev,struct cx88_dmaqueue * q)98 int cx8800_restart_vbi_queue(struct cx8800_dev    *dev,
99 			     struct cx88_dmaqueue *q)
100 {
101 	struct cx88_buffer *buf;
102 
103 	if (list_empty(&q->active))
104 		return 0;
105 
106 	buf = list_entry(q->active.next, struct cx88_buffer, list);
107 	dprintk(2, "restart_queue [%p/%d]: restart dma\n",
108 		buf, buf->vb.vb2_buf.index);
109 	cx8800_start_vbi_dma(dev, q, buf);
110 	return 0;
111 }
112 
113 /* ------------------------------------------------------------------ */
114 
queue_setup(struct vb2_queue * q,unsigned int * num_buffers,unsigned int * num_planes,unsigned int sizes[],struct device * alloc_devs[])115 static int queue_setup(struct vb2_queue *q,
116 		       unsigned int *num_buffers, unsigned int *num_planes,
117 		       unsigned int sizes[], struct device *alloc_devs[])
118 {
119 	struct cx8800_dev *dev = q->drv_priv;
120 
121 	*num_planes = 1;
122 	if (dev->core->tvnorm & V4L2_STD_525_60)
123 		sizes[0] = VBI_LINE_NTSC_COUNT * VBI_LINE_LENGTH * 2;
124 	else
125 		sizes[0] = VBI_LINE_PAL_COUNT * VBI_LINE_LENGTH * 2;
126 	return 0;
127 }
128 
buffer_prepare(struct vb2_buffer * vb)129 static int buffer_prepare(struct vb2_buffer *vb)
130 {
131 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
132 	struct cx8800_dev *dev = vb->vb2_queue->drv_priv;
133 	struct cx88_buffer *buf = container_of(vbuf, struct cx88_buffer, vb);
134 	struct sg_table *sgt = vb2_dma_sg_plane_desc(vb, 0);
135 	unsigned int lines;
136 	unsigned int size;
137 
138 	if (dev->core->tvnorm & V4L2_STD_525_60)
139 		lines = VBI_LINE_NTSC_COUNT;
140 	else
141 		lines = VBI_LINE_PAL_COUNT;
142 	size = lines * VBI_LINE_LENGTH * 2;
143 	if (vb2_plane_size(vb, 0) < size)
144 		return -EINVAL;
145 	vb2_set_plane_payload(vb, 0, size);
146 
147 	return cx88_risc_buffer(dev->pci, &buf->risc, sgt->sgl,
148 				0, VBI_LINE_LENGTH * lines,
149 				VBI_LINE_LENGTH, 0,
150 				lines);
151 }
152 
buffer_finish(struct vb2_buffer * vb)153 static void buffer_finish(struct vb2_buffer *vb)
154 {
155 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
156 	struct cx8800_dev *dev = vb->vb2_queue->drv_priv;
157 	struct cx88_buffer *buf = container_of(vbuf, struct cx88_buffer, vb);
158 	struct cx88_riscmem *risc = &buf->risc;
159 
160 	if (risc->cpu)
161 		dma_free_coherent(&dev->pci->dev, risc->size, risc->cpu,
162 				  risc->dma);
163 	memset(risc, 0, sizeof(*risc));
164 }
165 
buffer_queue(struct vb2_buffer * vb)166 static void buffer_queue(struct vb2_buffer *vb)
167 {
168 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
169 	struct cx8800_dev *dev = vb->vb2_queue->drv_priv;
170 	struct cx88_buffer    *buf = container_of(vbuf, struct cx88_buffer, vb);
171 	struct cx88_buffer    *prev;
172 	struct cx88_dmaqueue  *q    = &dev->vbiq;
173 
174 	/* add jump to start */
175 	buf->risc.cpu[1] = cpu_to_le32(buf->risc.dma + 8);
176 	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_CNT_INC);
177 	buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma + 8);
178 
179 	if (list_empty(&q->active)) {
180 		list_add_tail(&buf->list, &q->active);
181 		dprintk(2, "[%p/%d] vbi_queue - first active\n",
182 			buf, buf->vb.vb2_buf.index);
183 
184 	} else {
185 		buf->risc.cpu[0] |= cpu_to_le32(RISC_IRQ1);
186 		prev = list_entry(q->active.prev, struct cx88_buffer, list);
187 		list_add_tail(&buf->list, &q->active);
188 		prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
189 		dprintk(2, "[%p/%d] buffer_queue - append to active\n",
190 			buf, buf->vb.vb2_buf.index);
191 	}
192 }
193 
start_streaming(struct vb2_queue * q,unsigned int count)194 static int start_streaming(struct vb2_queue *q, unsigned int count)
195 {
196 	struct cx8800_dev *dev = q->drv_priv;
197 	struct cx88_dmaqueue *dmaq = &dev->vbiq;
198 	struct cx88_buffer *buf = list_entry(dmaq->active.next,
199 			struct cx88_buffer, list);
200 
201 	cx8800_start_vbi_dma(dev, dmaq, buf);
202 	return 0;
203 }
204 
stop_streaming(struct vb2_queue * q)205 static void stop_streaming(struct vb2_queue *q)
206 {
207 	struct cx8800_dev *dev = q->drv_priv;
208 	struct cx88_core *core = dev->core;
209 	struct cx88_dmaqueue *dmaq = &dev->vbiq;
210 	unsigned long flags;
211 
212 	cx_clear(MO_VID_DMACNTRL, 0x11);
213 	cx_clear(VID_CAPTURE_CONTROL, 0x06);
214 	cx8800_stop_vbi_dma(dev);
215 	spin_lock_irqsave(&dev->slock, flags);
216 	while (!list_empty(&dmaq->active)) {
217 		struct cx88_buffer *buf = list_entry(dmaq->active.next,
218 			struct cx88_buffer, list);
219 
220 		list_del(&buf->list);
221 		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
222 	}
223 	spin_unlock_irqrestore(&dev->slock, flags);
224 }
225 
226 const struct vb2_ops cx8800_vbi_qops = {
227 	.queue_setup    = queue_setup,
228 	.buf_prepare  = buffer_prepare,
229 	.buf_finish = buffer_finish,
230 	.buf_queue    = buffer_queue,
231 	.wait_prepare = vb2_ops_wait_prepare,
232 	.wait_finish = vb2_ops_wait_finish,
233 	.start_streaming = start_streaming,
234 	.stop_streaming = stop_streaming,
235 };
236