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9#include <linux/device.h>
10#include <linux/interrupt.h>
11#include <linux/list.h>
12#include <linux/mutex.h>
13#include <linux/spinlock.h>
14#include <media/videobuf2-dma-contig.h>
15#include <media/videobuf2-v4l2.h>
16
17#include "sun4i_csi.h"
18
19struct sun4i_csi_buffer {
20 struct vb2_v4l2_buffer vb;
21 struct list_head list;
22};
23
24static inline struct sun4i_csi_buffer *
25vb2_v4l2_to_csi_buffer(const struct vb2_v4l2_buffer *p)
26{
27 return container_of(p, struct sun4i_csi_buffer, vb);
28}
29
30static inline struct sun4i_csi_buffer *
31vb2_to_csi_buffer(const struct vb2_buffer *p)
32{
33 return vb2_v4l2_to_csi_buffer(to_vb2_v4l2_buffer(p));
34}
35
36static void sun4i_csi_capture_start(struct sun4i_csi *csi)
37{
38 writel(CSI_CPT_CTRL_VIDEO_START, csi->regs + CSI_CPT_CTRL_REG);
39}
40
41static void sun4i_csi_capture_stop(struct sun4i_csi *csi)
42{
43 writel(0, csi->regs + CSI_CPT_CTRL_REG);
44}
45
46static int sun4i_csi_queue_setup(struct vb2_queue *vq,
47 unsigned int *nbuffers,
48 unsigned int *nplanes,
49 unsigned int sizes[],
50 struct device *alloc_devs[])
51{
52 struct sun4i_csi *csi = vb2_get_drv_priv(vq);
53 unsigned int num_planes = csi->fmt.num_planes;
54 unsigned int i;
55
56 if (*nplanes) {
57 if (*nplanes != num_planes)
58 return -EINVAL;
59
60 for (i = 0; i < num_planes; i++)
61 if (sizes[i] < csi->fmt.plane_fmt[i].sizeimage)
62 return -EINVAL;
63 return 0;
64 }
65
66 *nplanes = num_planes;
67 for (i = 0; i < num_planes; i++)
68 sizes[i] = csi->fmt.plane_fmt[i].sizeimage;
69
70 return 0;
71};
72
73static int sun4i_csi_buffer_prepare(struct vb2_buffer *vb)
74{
75 struct sun4i_csi *csi = vb2_get_drv_priv(vb->vb2_queue);
76 unsigned int i;
77
78 for (i = 0; i < csi->fmt.num_planes; i++) {
79 unsigned long size = csi->fmt.plane_fmt[i].sizeimage;
80
81 if (vb2_plane_size(vb, i) < size) {
82 dev_err(csi->dev, "buffer too small (%lu < %lu)\n",
83 vb2_plane_size(vb, i), size);
84 return -EINVAL;
85 }
86
87 vb2_set_plane_payload(vb, i, size);
88 }
89
90 return 0;
91}
92
93static int sun4i_csi_setup_scratch_buffer(struct sun4i_csi *csi,
94 unsigned int slot)
95{
96 dma_addr_t addr = csi->scratch.paddr;
97 unsigned int plane;
98
99 dev_dbg(csi->dev,
100 "No more available buffer, using the scratch buffer\n");
101
102 for (plane = 0; plane < csi->fmt.num_planes; plane++) {
103 writel(addr, csi->regs + CSI_BUF_ADDR_REG(plane, slot));
104 addr += csi->fmt.plane_fmt[plane].sizeimage;
105 }
106
107 csi->current_buf[slot] = NULL;
108 return 0;
109}
110
111static int sun4i_csi_buffer_fill_slot(struct sun4i_csi *csi, unsigned int slot)
112{
113 struct sun4i_csi_buffer *c_buf;
114 struct vb2_v4l2_buffer *v_buf;
115 unsigned int plane;
116
117
118
119
120
121 if (WARN_ON(csi->current_buf[slot]))
122 return -EINVAL;
123
124 if (list_empty(&csi->buf_list))
125 return sun4i_csi_setup_scratch_buffer(csi, slot);
126
127 c_buf = list_first_entry(&csi->buf_list, struct sun4i_csi_buffer, list);
128 list_del_init(&c_buf->list);
129
130 v_buf = &c_buf->vb;
131 csi->current_buf[slot] = v_buf;
132
133 for (plane = 0; plane < csi->fmt.num_planes; plane++) {
134 dma_addr_t buf_addr;
135
136 buf_addr = vb2_dma_contig_plane_dma_addr(&v_buf->vb2_buf,
137 plane);
138 writel(buf_addr, csi->regs + CSI_BUF_ADDR_REG(plane, slot));
139 }
140
141 return 0;
142}
143
144static int sun4i_csi_buffer_fill_all(struct sun4i_csi *csi)
145{
146 unsigned int slot;
147 int ret;
148
149 for (slot = 0; slot < CSI_MAX_BUFFER; slot++) {
150 ret = sun4i_csi_buffer_fill_slot(csi, slot);
151 if (ret)
152 return ret;
153 }
154
155 return 0;
156}
157
158static void sun4i_csi_buffer_mark_done(struct sun4i_csi *csi,
159 unsigned int slot,
160 unsigned int sequence)
161{
162 struct vb2_v4l2_buffer *v_buf;
163
164 if (!csi->current_buf[slot]) {
165 dev_dbg(csi->dev, "Scratch buffer was used, ignoring..\n");
166 return;
167 }
168
169 v_buf = csi->current_buf[slot];
170 v_buf->field = csi->fmt.field;
171 v_buf->sequence = sequence;
172 v_buf->vb2_buf.timestamp = ktime_get_ns();
173 vb2_buffer_done(&v_buf->vb2_buf, VB2_BUF_STATE_DONE);
174
175 csi->current_buf[slot] = NULL;
176}
177
178static int sun4i_csi_buffer_flip(struct sun4i_csi *csi, unsigned int sequence)
179{
180 u32 reg = readl(csi->regs + CSI_BUF_CTRL_REG);
181 unsigned int next;
182
183
184 next = !(reg & CSI_BUF_CTRL_DBS);
185
186
187 sun4i_csi_buffer_mark_done(csi, next, sequence);
188
189
190 return sun4i_csi_buffer_fill_slot(csi, next);
191}
192
193static void sun4i_csi_buffer_queue(struct vb2_buffer *vb)
194{
195 struct sun4i_csi *csi = vb2_get_drv_priv(vb->vb2_queue);
196 struct sun4i_csi_buffer *buf = vb2_to_csi_buffer(vb);
197 unsigned long flags;
198
199 spin_lock_irqsave(&csi->qlock, flags);
200 list_add_tail(&buf->list, &csi->buf_list);
201 spin_unlock_irqrestore(&csi->qlock, flags);
202}
203
204static void return_all_buffers(struct sun4i_csi *csi,
205 enum vb2_buffer_state state)
206{
207 struct sun4i_csi_buffer *buf, *node;
208 unsigned int slot;
209
210 list_for_each_entry_safe(buf, node, &csi->buf_list, list) {
211 vb2_buffer_done(&buf->vb.vb2_buf, state);
212 list_del(&buf->list);
213 }
214
215 for (slot = 0; slot < CSI_MAX_BUFFER; slot++) {
216 struct vb2_v4l2_buffer *v_buf = csi->current_buf[slot];
217
218 if (!v_buf)
219 continue;
220
221 vb2_buffer_done(&v_buf->vb2_buf, state);
222 csi->current_buf[slot] = NULL;
223 }
224}
225
226static int sun4i_csi_start_streaming(struct vb2_queue *vq, unsigned int count)
227{
228 struct sun4i_csi *csi = vb2_get_drv_priv(vq);
229 struct v4l2_fwnode_bus_parallel *bus = &csi->bus;
230 const struct sun4i_csi_format *csi_fmt;
231 unsigned long hsync_pol, pclk_pol, vsync_pol;
232 unsigned long flags;
233 unsigned int i;
234 int ret;
235
236 csi_fmt = sun4i_csi_find_format(&csi->fmt.pixelformat, NULL);
237 if (!csi_fmt)
238 return -EINVAL;
239
240 dev_dbg(csi->dev, "Starting capture\n");
241
242 csi->sequence = 0;
243
244
245
246
247
248
249
250
251
252
253
254
255 csi->scratch.size = 0;
256 for (i = 0; i < csi->fmt.num_planes; i++)
257 csi->scratch.size += csi->fmt.plane_fmt[i].sizeimage;
258
259 csi->scratch.vaddr = dma_alloc_coherent(csi->dev,
260 csi->scratch.size,
261 &csi->scratch.paddr,
262 GFP_KERNEL);
263 if (!csi->scratch.vaddr) {
264 dev_err(csi->dev, "Failed to allocate scratch buffer\n");
265 ret = -ENOMEM;
266 goto err_clear_dma_queue;
267 }
268
269 ret = media_pipeline_start(&csi->vdev.entity, &csi->vdev.pipe);
270 if (ret < 0)
271 goto err_free_scratch_buffer;
272
273 spin_lock_irqsave(&csi->qlock, flags);
274
275
276 writel(CSI_WIN_CTRL_W_ACTIVE(csi->fmt.width * 2),
277 csi->regs + CSI_WIN_CTRL_W_REG);
278 writel(CSI_WIN_CTRL_H_ACTIVE(csi->fmt.height),
279 csi->regs + CSI_WIN_CTRL_H_REG);
280
281 hsync_pol = !!(bus->flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH);
282 pclk_pol = !!(bus->flags & V4L2_MBUS_DATA_ACTIVE_HIGH);
283 vsync_pol = !!(bus->flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH);
284 writel(CSI_CFG_INPUT_FMT(csi_fmt->input) |
285 CSI_CFG_OUTPUT_FMT(csi_fmt->output) |
286 CSI_CFG_VSYNC_POL(vsync_pol) |
287 CSI_CFG_HSYNC_POL(hsync_pol) |
288 CSI_CFG_PCLK_POL(pclk_pol),
289 csi->regs + CSI_CFG_REG);
290
291
292 writel(csi->fmt.plane_fmt[0].bytesperline,
293 csi->regs + CSI_BUF_LEN_REG);
294
295
296 ret = sun4i_csi_buffer_fill_all(csi);
297 if (ret) {
298 spin_unlock_irqrestore(&csi->qlock, flags);
299 goto err_disable_pipeline;
300 }
301
302
303 writel(CSI_BUF_CTRL_DBE, csi->regs + CSI_BUF_CTRL_REG);
304
305
306 writel(CSI_INT_FRM_DONE, csi->regs + 0x34);
307
308
309 writel(CSI_INT_FRM_DONE, csi->regs + CSI_INT_EN_REG);
310
311 sun4i_csi_capture_start(csi);
312
313 spin_unlock_irqrestore(&csi->qlock, flags);
314
315 ret = v4l2_subdev_call(csi->src_subdev, video, s_stream, 1);
316 if (ret < 0 && ret != -ENOIOCTLCMD)
317 goto err_disable_device;
318
319 return 0;
320
321err_disable_device:
322 sun4i_csi_capture_stop(csi);
323
324err_disable_pipeline:
325 media_pipeline_stop(&csi->vdev.entity);
326
327err_free_scratch_buffer:
328 dma_free_coherent(csi->dev, csi->scratch.size, csi->scratch.vaddr,
329 csi->scratch.paddr);
330
331err_clear_dma_queue:
332 spin_lock_irqsave(&csi->qlock, flags);
333 return_all_buffers(csi, VB2_BUF_STATE_QUEUED);
334 spin_unlock_irqrestore(&csi->qlock, flags);
335
336 return ret;
337}
338
339static void sun4i_csi_stop_streaming(struct vb2_queue *vq)
340{
341 struct sun4i_csi *csi = vb2_get_drv_priv(vq);
342 unsigned long flags;
343
344 dev_dbg(csi->dev, "Stopping capture\n");
345
346 v4l2_subdev_call(csi->src_subdev, video, s_stream, 0);
347 sun4i_csi_capture_stop(csi);
348
349
350 spin_lock_irqsave(&csi->qlock, flags);
351 return_all_buffers(csi, VB2_BUF_STATE_ERROR);
352 spin_unlock_irqrestore(&csi->qlock, flags);
353
354 media_pipeline_stop(&csi->vdev.entity);
355
356 dma_free_coherent(csi->dev, csi->scratch.size, csi->scratch.vaddr,
357 csi->scratch.paddr);
358}
359
360static const struct vb2_ops sun4i_csi_qops = {
361 .queue_setup = sun4i_csi_queue_setup,
362 .buf_prepare = sun4i_csi_buffer_prepare,
363 .buf_queue = sun4i_csi_buffer_queue,
364 .start_streaming = sun4i_csi_start_streaming,
365 .stop_streaming = sun4i_csi_stop_streaming,
366 .wait_prepare = vb2_ops_wait_prepare,
367 .wait_finish = vb2_ops_wait_finish,
368};
369
370static irqreturn_t sun4i_csi_irq(int irq, void *data)
371{
372 struct sun4i_csi *csi = data;
373 u32 reg;
374
375 reg = readl(csi->regs + CSI_INT_STA_REG);
376
377
378 writel(reg, csi->regs + CSI_INT_STA_REG);
379
380 if (!(reg & CSI_INT_FRM_DONE))
381 return IRQ_HANDLED;
382
383 spin_lock(&csi->qlock);
384 if (sun4i_csi_buffer_flip(csi, csi->sequence++)) {
385 dev_warn(csi->dev, "%s: Flip failed\n", __func__);
386 sun4i_csi_capture_stop(csi);
387 }
388 spin_unlock(&csi->qlock);
389
390 return IRQ_HANDLED;
391}
392
393int sun4i_csi_dma_register(struct sun4i_csi *csi, int irq)
394{
395 struct vb2_queue *q = &csi->queue;
396 int ret;
397 int i;
398
399 spin_lock_init(&csi->qlock);
400 mutex_init(&csi->lock);
401
402 INIT_LIST_HEAD(&csi->buf_list);
403 for (i = 0; i < CSI_MAX_BUFFER; i++)
404 csi->current_buf[i] = NULL;
405
406 q->min_buffers_needed = 3;
407 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
408 q->io_modes = VB2_MMAP;
409 q->lock = &csi->lock;
410 q->drv_priv = csi;
411 q->buf_struct_size = sizeof(struct sun4i_csi_buffer);
412 q->ops = &sun4i_csi_qops;
413 q->mem_ops = &vb2_dma_contig_memops;
414 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
415 q->dev = csi->dev;
416
417 ret = vb2_queue_init(q);
418 if (ret < 0) {
419 dev_err(csi->dev, "failed to initialize VB2 queue\n");
420 goto err_free_mutex;
421 }
422
423 ret = v4l2_device_register(csi->dev, &csi->v4l);
424 if (ret) {
425 dev_err(csi->dev, "Couldn't register the v4l2 device\n");
426 goto err_free_queue;
427 }
428
429 ret = devm_request_irq(csi->dev, irq, sun4i_csi_irq, 0,
430 dev_name(csi->dev), csi);
431 if (ret) {
432 dev_err(csi->dev, "Couldn't register our interrupt\n");
433 goto err_unregister_device;
434 }
435
436 return 0;
437
438err_unregister_device:
439 v4l2_device_unregister(&csi->v4l);
440
441err_free_queue:
442 vb2_queue_release(q);
443
444err_free_mutex:
445 mutex_destroy(&csi->lock);
446 return ret;
447}
448
449void sun4i_csi_dma_unregister(struct sun4i_csi *csi)
450{
451 v4l2_device_unregister(&csi->v4l);
452 vb2_queue_release(&csi->queue);
453 mutex_destroy(&csi->lock);
454}
455
