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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Driver for the Conexant CX23885 PCIe bridge
4 *
5 * Copyright (c) 2007 Steven Toth <stoth@linuxtv.org>
6 */
7
8#include "cx23885.h"
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/moduleparam.h>
13#include <linux/init.h>
14
15static unsigned int vbibufs = 4;
16module_param(vbibufs, int, 0644);
17MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32");
18
19static unsigned int vbi_debug;
20module_param(vbi_debug, int, 0644);
21MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");
22
23#define dprintk(level, fmt, arg...)\
24 do { if (vbi_debug >= level)\
25 printk(KERN_DEBUG pr_fmt("%s: vbi:" fmt), \
26 __func__, ##arg); \
27 } while (0)
28
29/* ------------------------------------------------------------------ */
30
31#define VBI_LINE_LENGTH 1440
32#define VBI_NTSC_LINE_COUNT 12
33#define VBI_PAL_LINE_COUNT 18
34
35
36int cx23885_vbi_fmt(struct file *file, void *priv,
37 struct v4l2_format *f)
38{
39 struct cx23885_dev *dev = video_drvdata(file);
40
41 f->fmt.vbi.sampling_rate = 27000000;
42 f->fmt.vbi.samples_per_line = VBI_LINE_LENGTH;
43 f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
44 f->fmt.vbi.offset = 0;
45 f->fmt.vbi.flags = 0;
46 if (dev->tvnorm & V4L2_STD_525_60) {
47 /* ntsc */
48 f->fmt.vbi.start[0] = V4L2_VBI_ITU_525_F1_START + 9;
49 f->fmt.vbi.start[1] = V4L2_VBI_ITU_525_F2_START + 9;
50 f->fmt.vbi.count[0] = VBI_NTSC_LINE_COUNT;
51 f->fmt.vbi.count[1] = VBI_NTSC_LINE_COUNT;
52 } else if (dev->tvnorm & V4L2_STD_625_50) {
53 /* pal */
54 f->fmt.vbi.start[0] = V4L2_VBI_ITU_625_F1_START + 5;
55 f->fmt.vbi.start[1] = V4L2_VBI_ITU_625_F2_START + 5;
56 f->fmt.vbi.count[0] = VBI_PAL_LINE_COUNT;
57 f->fmt.vbi.count[1] = VBI_PAL_LINE_COUNT;
58 }
59
60 return 0;
61}
62
63/* We're given the Video Interrupt status register.
64 * The cx23885_video_irq() func has already validated
65 * the potential error bits, we just need to
66 * deal with vbi payload and return indication if
67 * we actually processed any payload.
68 */
69int cx23885_vbi_irq(struct cx23885_dev *dev, u32 status)
70{
71 u32 count;
72 int handled = 0;
73
74 if (status & VID_BC_MSK_VBI_RISCI1) {
75 dprintk(1, "%s() VID_BC_MSK_VBI_RISCI1\n", __func__);
76 spin_lock(&dev->slock);
77 count = cx_read(VBI_A_GPCNT);
78 cx23885_video_wakeup(dev, &dev->vbiq, count);
79 spin_unlock(&dev->slock);
80 handled++;
81 }
82
83 return handled;
84}
85
86static int cx23885_start_vbi_dma(struct cx23885_dev *dev,
87 struct cx23885_dmaqueue *q,
88 struct cx23885_buffer *buf)
89{
90 dprintk(1, "%s()\n", __func__);
91
92 /* setup fifo + format */
93 cx23885_sram_channel_setup(dev, &dev->sram_channels[SRAM_CH02],
94 VBI_LINE_LENGTH, buf->risc.dma);
95
96 /* reset counter */
97 cx_write(VID_A_VBI_CTRL, 3);
98 cx_write(VBI_A_GPCNT_CTL, 3);
99 q->count = 0;
100
101 /* enable irq */
102 cx23885_irq_add_enable(dev, 0x01);
103 cx_set(VID_A_INT_MSK, 0x000022);
104
105 /* start dma */
106 cx_set(DEV_CNTRL2, (1<<5));
107 cx_set(VID_A_DMA_CTL, 0x22); /* FIFO and RISC enable */
108
109 return 0;
110}
111
112/* ------------------------------------------------------------------ */
113
114static int queue_setup(struct vb2_queue *q,
115 unsigned int *num_buffers, unsigned int *num_planes,
116 unsigned int sizes[], struct device *alloc_devs[])
117{
118 struct cx23885_dev *dev = q->drv_priv;
119 unsigned lines = VBI_PAL_LINE_COUNT;
120
121 if (dev->tvnorm & V4L2_STD_525_60)
122 lines = VBI_NTSC_LINE_COUNT;
123 *num_planes = 1;
124 sizes[0] = lines * VBI_LINE_LENGTH * 2;
125 return 0;
126}
127
128static int buffer_prepare(struct vb2_buffer *vb)
129{
130 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
131 struct cx23885_dev *dev = vb->vb2_queue->drv_priv;
132 struct cx23885_buffer *buf = container_of(vbuf,
133 struct cx23885_buffer, vb);
134 struct sg_table *sgt = vb2_dma_sg_plane_desc(vb, 0);
135 unsigned lines = VBI_PAL_LINE_COUNT;
136
137 if (dev->tvnorm & V4L2_STD_525_60)
138 lines = VBI_NTSC_LINE_COUNT;
139
140 if (vb2_plane_size(vb, 0) < lines * VBI_LINE_LENGTH * 2)
141 return -EINVAL;
142 vb2_set_plane_payload(vb, 0, lines * VBI_LINE_LENGTH * 2);
143
144 cx23885_risc_vbibuffer(dev->pci, &buf->risc,
145 sgt->sgl,
146 0, VBI_LINE_LENGTH * lines,
147 VBI_LINE_LENGTH, 0,
148 lines);
149 return 0;
150}
151
152static void buffer_finish(struct vb2_buffer *vb)
153{
154 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
155 struct cx23885_buffer *buf = container_of(vbuf,
156 struct cx23885_buffer, vb);
157
158 cx23885_free_buffer(vb->vb2_queue->drv_priv, buf);
159}
160
161/*
162 * The risc program for each buffer works as follows: it starts with a simple
163 * 'JUMP to addr + 12', which is effectively a NOP. Then the code to DMA the
164 * buffer follows and at the end we have a JUMP back to the start + 12 (skipping
165 * the initial JUMP).
166 *
167 * This is the risc program of the first buffer to be queued if the active list
168 * is empty and it just keeps DMAing this buffer without generating any
169 * interrupts.
170 *
171 * If a new buffer is added then the initial JUMP in the code for that buffer
172 * will generate an interrupt which signals that the previous buffer has been
173 * DMAed successfully and that it can be returned to userspace.
174 *
175 * It also sets the final jump of the previous buffer to the start of the new
176 * buffer, thus chaining the new buffer into the DMA chain. This is a single
177 * atomic u32 write, so there is no race condition.
178 *
179 * The end-result of all this that you only get an interrupt when a buffer
180 * is ready, so the control flow is very easy.
181 */
182static void buffer_queue(struct vb2_buffer *vb)
183{
184 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
185 struct cx23885_dev *dev = vb->vb2_queue->drv_priv;
186 struct cx23885_buffer *buf = container_of(vbuf,
187 struct cx23885_buffer, vb);
188 struct cx23885_buffer *prev;
189 struct cx23885_dmaqueue *q = &dev->vbiq;
190 unsigned long flags;
191
192 buf->risc.cpu[1] = cpu_to_le32(buf->risc.dma + 12);
193 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_CNT_INC);
194 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma + 12);
195 buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
196
197 if (list_empty(&q->active)) {
198 spin_lock_irqsave(&dev->slock, flags);
199 list_add_tail(&buf->queue, &q->active);
200 spin_unlock_irqrestore(&dev->slock, flags);
201 dprintk(2, "[%p/%d] vbi_queue - first active\n",
202 buf, buf->vb.vb2_buf.index);
203
204 } else {
205 buf->risc.cpu[0] |= cpu_to_le32(RISC_IRQ1);
206 prev = list_entry(q->active.prev, struct cx23885_buffer,
207 queue);
208 spin_lock_irqsave(&dev->slock, flags);
209 list_add_tail(&buf->queue, &q->active);
210 spin_unlock_irqrestore(&dev->slock, flags);
211 prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
212 dprintk(2, "[%p/%d] buffer_queue - append to active\n",
213 buf, buf->vb.vb2_buf.index);
214 }
215}
216
217static int cx23885_start_streaming(struct vb2_queue *q, unsigned int count)
218{
219 struct cx23885_dev *dev = q->drv_priv;
220 struct cx23885_dmaqueue *dmaq = &dev->vbiq;
221 struct cx23885_buffer *buf = list_entry(dmaq->active.next,
222 struct cx23885_buffer, queue);
223
224 cx23885_start_vbi_dma(dev, dmaq, buf);
225 return 0;
226}
227
228static void cx23885_stop_streaming(struct vb2_queue *q)
229{
230 struct cx23885_dev *dev = q->drv_priv;
231 struct cx23885_dmaqueue *dmaq = &dev->vbiq;
232 unsigned long flags;
233
234 cx_clear(VID_A_DMA_CTL, 0x22); /* FIFO and RISC enable */
235 spin_lock_irqsave(&dev->slock, flags);
236 while (!list_empty(&dmaq->active)) {
237 struct cx23885_buffer *buf = list_entry(dmaq->active.next,
238 struct cx23885_buffer, queue);
239
240 list_del(&buf->queue);
241 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
242 }
243 spin_unlock_irqrestore(&dev->slock, flags);
244}
245
246
247const struct vb2_ops cx23885_vbi_qops = {
248 .queue_setup = queue_setup,
249 .buf_prepare = buffer_prepare,
250 .buf_finish = buffer_finish,
251 .buf_queue = buffer_queue,
252 .wait_prepare = vb2_ops_wait_prepare,
253 .wait_finish = vb2_ops_wait_finish,
254 .start_streaming = cx23885_start_streaming,
255 .stop_streaming = cx23885_stop_streaming,
256};
1/*
2 * Driver for the Conexant CX23885 PCIe bridge
3 *
4 * Copyright (c) 2007 Steven Toth <stoth@linuxtv.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 *
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/moduleparam.h>
25#include <linux/init.h>
26
27#include "cx23885.h"
28
29static unsigned int vbibufs = 4;
30module_param(vbibufs, int, 0644);
31MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32");
32
33static unsigned int vbi_debug;
34module_param(vbi_debug, int, 0644);
35MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");
36
37#define dprintk(level, fmt, arg...)\
38 do { if (vbi_debug >= level)\
39 printk(KERN_DEBUG "%s/0: " fmt, dev->name, ## arg);\
40 } while (0)
41
42/* ------------------------------------------------------------------ */
43
44#define VBI_LINE_LENGTH 1440
45#define NTSC_VBI_START_LINE 10 /* line 10 - 21 */
46#define NTSC_VBI_END_LINE 21
47#define NTSC_VBI_LINES (NTSC_VBI_END_LINE - NTSC_VBI_START_LINE + 1)
48
49
50int cx23885_vbi_fmt(struct file *file, void *priv,
51 struct v4l2_format *f)
52{
53 struct cx23885_fh *fh = priv;
54 struct cx23885_dev *dev = fh->dev;
55
56 if (dev->tvnorm & V4L2_STD_525_60) {
57 /* ntsc */
58 f->fmt.vbi.samples_per_line = VBI_LINE_LENGTH;
59 f->fmt.vbi.sampling_rate = 27000000;
60 f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
61 f->fmt.vbi.offset = 0;
62 f->fmt.vbi.flags = 0;
63 f->fmt.vbi.start[0] = 10;
64 f->fmt.vbi.count[0] = 17;
65 f->fmt.vbi.start[1] = 263 + 10 + 1;
66 f->fmt.vbi.count[1] = 17;
67 } else if (dev->tvnorm & V4L2_STD_625_50) {
68 /* pal */
69 f->fmt.vbi.sampling_rate = 35468950;
70 f->fmt.vbi.start[0] = 7 - 1;
71 f->fmt.vbi.start[1] = 319 - 1;
72 }
73
74 return 0;
75}
76
77/* We're given the Video Interrupt status register.
78 * The cx23885_video_irq() func has already validated
79 * the potential error bits, we just need to
80 * deal with vbi payload and return indication if
81 * we actually processed any payload.
82 */
83int cx23885_vbi_irq(struct cx23885_dev *dev, u32 status)
84{
85 u32 count;
86 int handled = 0;
87
88 if (status & VID_BC_MSK_VBI_RISCI1) {
89 dprintk(1, "%s() VID_BC_MSK_VBI_RISCI1\n", __func__);
90 spin_lock(&dev->slock);
91 count = cx_read(VID_A_GPCNT);
92 cx23885_video_wakeup(dev, &dev->vbiq, count);
93 spin_unlock(&dev->slock);
94 handled++;
95 }
96
97 if (status & VID_BC_MSK_VBI_RISCI2) {
98 dprintk(1, "%s() VID_BC_MSK_VBI_RISCI2\n", __func__);
99 dprintk(2, "stopper vbi\n");
100 spin_lock(&dev->slock);
101 cx23885_restart_vbi_queue(dev, &dev->vbiq);
102 spin_unlock(&dev->slock);
103 handled++;
104 }
105
106 return handled;
107}
108
109static int cx23885_start_vbi_dma(struct cx23885_dev *dev,
110 struct cx23885_dmaqueue *q,
111 struct cx23885_buffer *buf)
112{
113 dprintk(1, "%s()\n", __func__);
114
115 /* setup fifo + format */
116 cx23885_sram_channel_setup(dev, &dev->sram_channels[SRAM_CH02],
117 buf->vb.width, buf->risc.dma);
118
119 /* reset counter */
120 cx_write(VID_A_GPCNT_CTL, 3);
121 cx_write(VID_A_VBI_CTRL, 3);
122 cx_write(VBI_A_GPCNT_CTL, 3);
123 q->count = 1;
124
125 /* enable irq */
126 cx23885_irq_add_enable(dev, 0x01);
127 cx_set(VID_A_INT_MSK, 0x000022);
128
129 /* start dma */
130 cx_set(DEV_CNTRL2, (1<<5));
131 cx_set(VID_A_DMA_CTL, 0x22); /* FIFO and RISC enable */
132
133 return 0;
134}
135
136
137int cx23885_restart_vbi_queue(struct cx23885_dev *dev,
138 struct cx23885_dmaqueue *q)
139{
140 struct cx23885_buffer *buf;
141 struct list_head *item;
142
143 if (list_empty(&q->active))
144 return 0;
145
146 buf = list_entry(q->active.next, struct cx23885_buffer, vb.queue);
147 dprintk(2, "restart_queue [%p/%d]: restart dma\n",
148 buf, buf->vb.i);
149 cx23885_start_vbi_dma(dev, q, buf);
150 list_for_each(item, &q->active) {
151 buf = list_entry(item, struct cx23885_buffer, vb.queue);
152 buf->count = q->count++;
153 }
154 mod_timer(&q->timeout, jiffies + (BUFFER_TIMEOUT / 30));
155 return 0;
156}
157
158void cx23885_vbi_timeout(unsigned long data)
159{
160 struct cx23885_dev *dev = (struct cx23885_dev *)data;
161 struct cx23885_dmaqueue *q = &dev->vbiq;
162 struct cx23885_buffer *buf;
163 unsigned long flags;
164
165 /* Stop the VBI engine */
166 cx_clear(VID_A_DMA_CTL, 0x22);
167
168 spin_lock_irqsave(&dev->slock, flags);
169 while (!list_empty(&q->active)) {
170 buf = list_entry(q->active.next, struct cx23885_buffer,
171 vb.queue);
172 list_del(&buf->vb.queue);
173 buf->vb.state = VIDEOBUF_ERROR;
174 wake_up(&buf->vb.done);
175 printk("%s/0: [%p/%d] timeout - dma=0x%08lx\n", dev->name,
176 buf, buf->vb.i, (unsigned long)buf->risc.dma);
177 }
178 cx23885_restart_vbi_queue(dev, q);
179 spin_unlock_irqrestore(&dev->slock, flags);
180}
181
182/* ------------------------------------------------------------------ */
183#define VBI_LINE_LENGTH 1440
184#define VBI_LINE_COUNT 17
185
186static int
187vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
188{
189 *size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
190 if (0 == *count)
191 *count = vbibufs;
192 if (*count < 2)
193 *count = 2;
194 if (*count > 32)
195 *count = 32;
196 return 0;
197}
198
199static int
200vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
201 enum v4l2_field field)
202{
203 struct cx23885_fh *fh = q->priv_data;
204 struct cx23885_dev *dev = fh->dev;
205 struct cx23885_buffer *buf = container_of(vb,
206 struct cx23885_buffer, vb);
207 struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
208 unsigned int size;
209 int rc;
210
211 size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
212 if (0 != buf->vb.baddr && buf->vb.bsize < size)
213 return -EINVAL;
214
215 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
216 buf->vb.width = VBI_LINE_LENGTH;
217 buf->vb.height = VBI_LINE_COUNT;
218 buf->vb.size = size;
219 buf->vb.field = V4L2_FIELD_SEQ_TB;
220
221 rc = videobuf_iolock(q, &buf->vb, NULL);
222 if (0 != rc)
223 goto fail;
224 cx23885_risc_vbibuffer(dev->pci, &buf->risc,
225 dma->sglist,
226 0, buf->vb.width * buf->vb.height,
227 buf->vb.width, 0,
228 buf->vb.height);
229 }
230 buf->vb.state = VIDEOBUF_PREPARED;
231 return 0;
232
233 fail:
234 cx23885_free_buffer(q, buf);
235 return rc;
236}
237
238static void
239vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
240{
241 struct cx23885_buffer *buf =
242 container_of(vb, struct cx23885_buffer, vb);
243 struct cx23885_buffer *prev;
244 struct cx23885_fh *fh = vq->priv_data;
245 struct cx23885_dev *dev = fh->dev;
246 struct cx23885_dmaqueue *q = &dev->vbiq;
247
248 /* add jump to stopper */
249 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
250 buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
251 buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
252
253 if (list_empty(&q->active)) {
254 list_add_tail(&buf->vb.queue, &q->active);
255 cx23885_start_vbi_dma(dev, q, buf);
256 buf->vb.state = VIDEOBUF_ACTIVE;
257 buf->count = q->count++;
258 mod_timer(&q->timeout, jiffies + (BUFFER_TIMEOUT / 30));
259 dprintk(2, "[%p/%d] vbi_queue - first active\n",
260 buf, buf->vb.i);
261
262 } else {
263 prev = list_entry(q->active.prev, struct cx23885_buffer,
264 vb.queue);
265 list_add_tail(&buf->vb.queue, &q->active);
266 buf->vb.state = VIDEOBUF_ACTIVE;
267 buf->count = q->count++;
268 prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
269 prev->risc.jmp[2] = cpu_to_le32(0); /* Bits 63-32 */
270 dprintk(2, "[%p/%d] buffer_queue - append to active\n",
271 buf, buf->vb.i);
272 }
273}
274
275static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
276{
277 struct cx23885_buffer *buf =
278 container_of(vb, struct cx23885_buffer, vb);
279
280 cx23885_free_buffer(q, buf);
281}
282
283struct videobuf_queue_ops cx23885_vbi_qops = {
284 .buf_setup = vbi_setup,
285 .buf_prepare = vbi_prepare,
286 .buf_queue = vbi_queue,
287 .buf_release = vbi_release,
288};
289
290/* ------------------------------------------------------------------ */
291/*
292 * Local variables:
293 * c-basic-offset: 8
294 * End:
295 */