1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * R-Car Gen3 Digital Radio Interface (DRIF) driver
4 *
5 * Copyright (C) 2017 Renesas Electronics Corporation
6 */
7
8 /*
9 * The R-Car DRIF is a receive only MSIOF like controller with an
10 * external master device driving the SCK. It receives data into a FIFO,
11 * then this driver uses the SYS-DMAC engine to move the data from
12 * the device to memory.
13 *
14 * Each DRIF channel DRIFx (as per datasheet) contains two internal
15 * channels DRIFx0 & DRIFx1 within itself with each having its own resources
16 * like module clk, register set, irq and dma. These internal channels share
17 * common CLK & SYNC from master. The two data pins D0 & D1 shall be
18 * considered to represent the two internal channels. This internal split
19 * is not visible to the master device.
20 *
21 * Depending on the master device, a DRIF channel can use
22 * (1) both internal channels (D0 & D1) to receive data in parallel (or)
23 * (2) one internal channel (D0 or D1) to receive data
24 *
25 * The primary design goal of this controller is to act as a Digital Radio
26 * Interface that receives digital samples from a tuner device. Hence the
27 * driver exposes the device as a V4L2 SDR device. In order to qualify as
28 * a V4L2 SDR device, it should possess a tuner interface as mandated by the
29 * framework. This driver expects a tuner driver (sub-device) to bind
30 * asynchronously with this device and the combined drivers shall expose
31 * a V4L2 compliant SDR device. The DRIF driver is independent of the
32 * tuner vendor.
33 *
34 * The DRIF h/w can support I2S mode and Frame start synchronization pulse mode.
35 * This driver is tested for I2S mode only because of the availability of
36 * suitable master devices. Hence, not all configurable options of DRIF h/w
37 * like lsb/msb first, syncdl, dtdl etc. are exposed via DT and I2S defaults
38 * are used. These can be exposed later if needed after testing.
39 */
40 #include <linux/bitops.h>
41 #include <linux/clk.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/dmaengine.h>
44 #include <linux/ioctl.h>
45 #include <linux/iopoll.h>
46 #include <linux/module.h>
47 #include <linux/of.h>
48 #include <linux/of_graph.h>
49 #include <linux/of_platform.h>
50 #include <linux/platform_device.h>
51 #include <linux/sched.h>
52 #include <media/v4l2-async.h>
53 #include <media/v4l2-ctrls.h>
54 #include <media/v4l2-device.h>
55 #include <media/v4l2-event.h>
56 #include <media/v4l2-fh.h>
57 #include <media/v4l2-ioctl.h>
58 #include <media/videobuf2-v4l2.h>
59 #include <media/videobuf2-vmalloc.h>
60
61 /* DRIF register offsets */
62 #define RCAR_DRIF_SITMDR1 0x00
63 #define RCAR_DRIF_SITMDR2 0x04
64 #define RCAR_DRIF_SITMDR3 0x08
65 #define RCAR_DRIF_SIRMDR1 0x10
66 #define RCAR_DRIF_SIRMDR2 0x14
67 #define RCAR_DRIF_SIRMDR3 0x18
68 #define RCAR_DRIF_SICTR 0x28
69 #define RCAR_DRIF_SIFCTR 0x30
70 #define RCAR_DRIF_SISTR 0x40
71 #define RCAR_DRIF_SIIER 0x44
72 #define RCAR_DRIF_SIRFDR 0x60
73
74 #define RCAR_DRIF_RFOVF BIT(3) /* Receive FIFO overflow */
75 #define RCAR_DRIF_RFUDF BIT(4) /* Receive FIFO underflow */
76 #define RCAR_DRIF_RFSERR BIT(5) /* Receive frame sync error */
77 #define RCAR_DRIF_REOF BIT(7) /* Frame reception end */
78 #define RCAR_DRIF_RDREQ BIT(12) /* Receive data xfer req */
79 #define RCAR_DRIF_RFFUL BIT(13) /* Receive FIFO full */
80
81 /* SIRMDR1 */
82 #define RCAR_DRIF_SIRMDR1_SYNCMD_FRAME (0 << 28)
83 #define RCAR_DRIF_SIRMDR1_SYNCMD_LR (3 << 28)
84
85 #define RCAR_DRIF_SIRMDR1_SYNCAC_POL_HIGH (0 << 25)
86 #define RCAR_DRIF_SIRMDR1_SYNCAC_POL_LOW (1 << 25)
87
88 #define RCAR_DRIF_SIRMDR1_MSB_FIRST (0 << 24)
89 #define RCAR_DRIF_SIRMDR1_LSB_FIRST (1 << 24)
90
91 #define RCAR_DRIF_SIRMDR1_DTDL_0 (0 << 20)
92 #define RCAR_DRIF_SIRMDR1_DTDL_1 (1 << 20)
93 #define RCAR_DRIF_SIRMDR1_DTDL_2 (2 << 20)
94 #define RCAR_DRIF_SIRMDR1_DTDL_0PT5 (5 << 20)
95 #define RCAR_DRIF_SIRMDR1_DTDL_1PT5 (6 << 20)
96
97 #define RCAR_DRIF_SIRMDR1_SYNCDL_0 (0 << 20)
98 #define RCAR_DRIF_SIRMDR1_SYNCDL_1 (1 << 20)
99 #define RCAR_DRIF_SIRMDR1_SYNCDL_2 (2 << 20)
100 #define RCAR_DRIF_SIRMDR1_SYNCDL_3 (3 << 20)
101 #define RCAR_DRIF_SIRMDR1_SYNCDL_0PT5 (5 << 20)
102 #define RCAR_DRIF_SIRMDR1_SYNCDL_1PT5 (6 << 20)
103
104 #define RCAR_DRIF_MDR_GRPCNT(n) (((n) - 1) << 30)
105 #define RCAR_DRIF_MDR_BITLEN(n) (((n) - 1) << 24)
106 #define RCAR_DRIF_MDR_WDCNT(n) (((n) - 1) << 16)
107
108 /* Hidden Transmit register that controls CLK & SYNC */
109 #define RCAR_DRIF_SITMDR1_PCON BIT(30)
110
111 #define RCAR_DRIF_SICTR_RX_RISING_EDGE BIT(26)
112 #define RCAR_DRIF_SICTR_RX_EN BIT(8)
113 #define RCAR_DRIF_SICTR_RESET BIT(0)
114
115 /* Constants */
116 #define RCAR_DRIF_NUM_HWBUFS 32
117 #define RCAR_DRIF_MAX_DEVS 4
118 #define RCAR_DRIF_DEFAULT_NUM_HWBUFS 16
119 #define RCAR_DRIF_DEFAULT_HWBUF_SIZE (4 * PAGE_SIZE)
120 #define RCAR_DRIF_MAX_CHANNEL 2
121 #define RCAR_SDR_BUFFER_SIZE SZ_64K
122
123 /* Internal buffer status flags */
124 #define RCAR_DRIF_BUF_DONE BIT(0) /* DMA completed */
125 #define RCAR_DRIF_BUF_OVERFLOW BIT(1) /* Overflow detected */
126
127 #define to_rcar_drif_buf_pair(sdr, ch_num, idx) \
128 (&((sdr)->ch[!(ch_num)]->buf[(idx)]))
129
130 #define for_each_rcar_drif_channel(ch, ch_mask) \
131 for_each_set_bit(ch, ch_mask, RCAR_DRIF_MAX_CHANNEL)
132
133 /* Debug */
134 #define rdrif_dbg(sdr, fmt, arg...) \
135 dev_dbg(sdr->v4l2_dev.dev, fmt, ## arg)
136
137 #define rdrif_err(sdr, fmt, arg...) \
138 dev_err(sdr->v4l2_dev.dev, fmt, ## arg)
139
140 /* Stream formats */
141 struct rcar_drif_format {
142 u32 pixelformat;
143 u32 buffersize;
144 u32 bitlen;
145 u32 wdcnt;
146 u32 num_ch;
147 };
148
149 /* Format descriptions for capture */
150 static const struct rcar_drif_format formats[] = {
151 {
152 .pixelformat = V4L2_SDR_FMT_PCU16BE,
153 .buffersize = RCAR_SDR_BUFFER_SIZE,
154 .bitlen = 16,
155 .wdcnt = 1,
156 .num_ch = 2,
157 },
158 {
159 .pixelformat = V4L2_SDR_FMT_PCU18BE,
160 .buffersize = RCAR_SDR_BUFFER_SIZE,
161 .bitlen = 18,
162 .wdcnt = 1,
163 .num_ch = 2,
164 },
165 {
166 .pixelformat = V4L2_SDR_FMT_PCU20BE,
167 .buffersize = RCAR_SDR_BUFFER_SIZE,
168 .bitlen = 20,
169 .wdcnt = 1,
170 .num_ch = 2,
171 },
172 };
173
174 /* Buffer for a received frame from one or both internal channels */
175 struct rcar_drif_frame_buf {
176 /* Common v4l buffer stuff -- must be first */
177 struct vb2_v4l2_buffer vb;
178 struct list_head list;
179 };
180
181 /* OF graph endpoint's V4L2 async data */
182 struct rcar_drif_graph_ep {
183 struct v4l2_subdev *subdev; /* Async matched subdev */
184 };
185
186 /* DMA buffer */
187 struct rcar_drif_hwbuf {
188 void *addr; /* CPU-side address */
189 unsigned int status; /* Buffer status flags */
190 };
191
192 /* Internal channel */
193 struct rcar_drif {
194 struct rcar_drif_sdr *sdr; /* Group device */
195 struct platform_device *pdev; /* Channel's pdev */
196 void __iomem *base; /* Base register address */
197 resource_size_t start; /* I/O resource offset */
198 struct dma_chan *dmach; /* Reserved DMA channel */
199 struct clk *clk; /* Module clock */
200 struct rcar_drif_hwbuf buf[RCAR_DRIF_NUM_HWBUFS]; /* H/W bufs */
201 dma_addr_t dma_handle; /* Handle for all bufs */
202 unsigned int num; /* Channel number */
203 bool acting_sdr; /* Channel acting as SDR device */
204 };
205
206 /* DRIF V4L2 SDR */
207 struct rcar_drif_sdr {
208 struct device *dev; /* Platform device */
209 struct video_device *vdev; /* V4L2 SDR device */
210 struct v4l2_device v4l2_dev; /* V4L2 device */
211
212 /* Videobuf2 queue and queued buffers list */
213 struct vb2_queue vb_queue;
214 struct list_head queued_bufs;
215 spinlock_t queued_bufs_lock; /* Protects queued_bufs */
216 spinlock_t dma_lock; /* To serialize DMA cb of channels */
217
218 struct mutex v4l2_mutex; /* To serialize ioctls */
219 struct mutex vb_queue_mutex; /* To serialize streaming ioctls */
220 struct v4l2_ctrl_handler ctrl_hdl; /* SDR control handler */
221 struct v4l2_async_notifier notifier; /* For subdev (tuner) */
222 struct rcar_drif_graph_ep ep; /* Endpoint V4L2 async data */
223
224 /* Current V4L2 SDR format ptr */
225 const struct rcar_drif_format *fmt;
226
227 /* Device tree SYNC properties */
228 u32 mdr1;
229
230 /* Internals */
231 struct rcar_drif *ch[RCAR_DRIF_MAX_CHANNEL]; /* DRIFx0,1 */
232 unsigned long hw_ch_mask; /* Enabled channels per DT */
233 unsigned long cur_ch_mask; /* Used channels for an SDR FMT */
234 u32 num_hw_ch; /* Num of DT enabled channels */
235 u32 num_cur_ch; /* Num of used channels */
236 u32 hwbuf_size; /* Each DMA buffer size */
237 u32 produced; /* Buffers produced by sdr dev */
238 };
239
240 /* Register access functions */
rcar_drif_write(struct rcar_drif * ch,u32 offset,u32 data)241 static void rcar_drif_write(struct rcar_drif *ch, u32 offset, u32 data)
242 {
243 writel(data, ch->base + offset);
244 }
245
rcar_drif_read(struct rcar_drif * ch,u32 offset)246 static u32 rcar_drif_read(struct rcar_drif *ch, u32 offset)
247 {
248 return readl(ch->base + offset);
249 }
250
251 /* Release DMA channels */
rcar_drif_release_dmachannels(struct rcar_drif_sdr * sdr)252 static void rcar_drif_release_dmachannels(struct rcar_drif_sdr *sdr)
253 {
254 unsigned int i;
255
256 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask)
257 if (sdr->ch[i]->dmach) {
258 dma_release_channel(sdr->ch[i]->dmach);
259 sdr->ch[i]->dmach = NULL;
260 }
261 }
262
263 /* Allocate DMA channels */
rcar_drif_alloc_dmachannels(struct rcar_drif_sdr * sdr)264 static int rcar_drif_alloc_dmachannels(struct rcar_drif_sdr *sdr)
265 {
266 struct dma_slave_config dma_cfg;
267 unsigned int i;
268 int ret;
269
270 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
271 struct rcar_drif *ch = sdr->ch[i];
272
273 ch->dmach = dma_request_chan(&ch->pdev->dev, "rx");
274 if (IS_ERR(ch->dmach)) {
275 ret = PTR_ERR(ch->dmach);
276 if (ret != -EPROBE_DEFER)
277 rdrif_err(sdr,
278 "ch%u: dma channel req failed: %pe\n",
279 i, ch->dmach);
280 ch->dmach = NULL;
281 goto dmach_error;
282 }
283
284 /* Configure slave */
285 memset(&dma_cfg, 0, sizeof(dma_cfg));
286 dma_cfg.src_addr = (phys_addr_t)(ch->start + RCAR_DRIF_SIRFDR);
287 dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
288 ret = dmaengine_slave_config(ch->dmach, &dma_cfg);
289 if (ret) {
290 rdrif_err(sdr, "ch%u: dma slave config failed\n", i);
291 goto dmach_error;
292 }
293 }
294 return 0;
295
296 dmach_error:
297 rcar_drif_release_dmachannels(sdr);
298 return ret;
299 }
300
301 /* Release queued vb2 buffers */
rcar_drif_release_queued_bufs(struct rcar_drif_sdr * sdr,enum vb2_buffer_state state)302 static void rcar_drif_release_queued_bufs(struct rcar_drif_sdr *sdr,
303 enum vb2_buffer_state state)
304 {
305 struct rcar_drif_frame_buf *fbuf, *tmp;
306 unsigned long flags;
307
308 spin_lock_irqsave(&sdr->queued_bufs_lock, flags);
309 list_for_each_entry_safe(fbuf, tmp, &sdr->queued_bufs, list) {
310 list_del(&fbuf->list);
311 vb2_buffer_done(&fbuf->vb.vb2_buf, state);
312 }
313 spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
314 }
315
316 /* Set MDR defaults */
rcar_drif_set_mdr1(struct rcar_drif_sdr * sdr)317 static inline void rcar_drif_set_mdr1(struct rcar_drif_sdr *sdr)
318 {
319 unsigned int i;
320
321 /* Set defaults for enabled internal channels */
322 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
323 /* Refer MSIOF section in manual for this register setting */
324 rcar_drif_write(sdr->ch[i], RCAR_DRIF_SITMDR1,
325 RCAR_DRIF_SITMDR1_PCON);
326
327 /* Setup MDR1 value */
328 rcar_drif_write(sdr->ch[i], RCAR_DRIF_SIRMDR1, sdr->mdr1);
329
330 rdrif_dbg(sdr, "ch%u: mdr1 = 0x%08x",
331 i, rcar_drif_read(sdr->ch[i], RCAR_DRIF_SIRMDR1));
332 }
333 }
334
335 /* Set DRIF receive format */
rcar_drif_set_format(struct rcar_drif_sdr * sdr)336 static int rcar_drif_set_format(struct rcar_drif_sdr *sdr)
337 {
338 unsigned int i;
339
340 rdrif_dbg(sdr, "setfmt: bitlen %u wdcnt %u num_ch %u\n",
341 sdr->fmt->bitlen, sdr->fmt->wdcnt, sdr->fmt->num_ch);
342
343 /* Sanity check */
344 if (sdr->fmt->num_ch > sdr->num_cur_ch) {
345 rdrif_err(sdr, "fmt num_ch %u cur_ch %u mismatch\n",
346 sdr->fmt->num_ch, sdr->num_cur_ch);
347 return -EINVAL;
348 }
349
350 /* Setup group, bitlen & wdcnt */
351 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
352 u32 mdr;
353
354 /* Two groups */
355 mdr = RCAR_DRIF_MDR_GRPCNT(2) |
356 RCAR_DRIF_MDR_BITLEN(sdr->fmt->bitlen) |
357 RCAR_DRIF_MDR_WDCNT(sdr->fmt->wdcnt);
358 rcar_drif_write(sdr->ch[i], RCAR_DRIF_SIRMDR2, mdr);
359
360 mdr = RCAR_DRIF_MDR_BITLEN(sdr->fmt->bitlen) |
361 RCAR_DRIF_MDR_WDCNT(sdr->fmt->wdcnt);
362 rcar_drif_write(sdr->ch[i], RCAR_DRIF_SIRMDR3, mdr);
363
364 rdrif_dbg(sdr, "ch%u: new mdr[2,3] = 0x%08x, 0x%08x\n",
365 i, rcar_drif_read(sdr->ch[i], RCAR_DRIF_SIRMDR2),
366 rcar_drif_read(sdr->ch[i], RCAR_DRIF_SIRMDR3));
367 }
368 return 0;
369 }
370
371 /* Release DMA buffers */
rcar_drif_release_buf(struct rcar_drif_sdr * sdr)372 static void rcar_drif_release_buf(struct rcar_drif_sdr *sdr)
373 {
374 unsigned int i;
375
376 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
377 struct rcar_drif *ch = sdr->ch[i];
378
379 /* First entry contains the dma buf ptr */
380 if (ch->buf[0].addr) {
381 dma_free_coherent(&ch->pdev->dev,
382 sdr->hwbuf_size * RCAR_DRIF_NUM_HWBUFS,
383 ch->buf[0].addr, ch->dma_handle);
384 ch->buf[0].addr = NULL;
385 }
386 }
387 }
388
389 /* Request DMA buffers */
rcar_drif_request_buf(struct rcar_drif_sdr * sdr)390 static int rcar_drif_request_buf(struct rcar_drif_sdr *sdr)
391 {
392 int ret = -ENOMEM;
393 unsigned int i, j;
394 void *addr;
395
396 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
397 struct rcar_drif *ch = sdr->ch[i];
398
399 /* Allocate DMA buffers */
400 addr = dma_alloc_coherent(&ch->pdev->dev,
401 sdr->hwbuf_size * RCAR_DRIF_NUM_HWBUFS,
402 &ch->dma_handle, GFP_KERNEL);
403 if (!addr) {
404 rdrif_err(sdr,
405 "ch%u: dma alloc failed. num hwbufs %u size %u\n",
406 i, RCAR_DRIF_NUM_HWBUFS, sdr->hwbuf_size);
407 goto error;
408 }
409
410 /* Split the chunk and populate bufctxt */
411 for (j = 0; j < RCAR_DRIF_NUM_HWBUFS; j++) {
412 ch->buf[j].addr = addr + (j * sdr->hwbuf_size);
413 ch->buf[j].status = 0;
414 }
415 }
416 return 0;
417 error:
418 return ret;
419 }
420
421 /* Setup vb_queue minimum buffer requirements */
rcar_drif_queue_setup(struct vb2_queue * vq,unsigned int * num_buffers,unsigned int * num_planes,unsigned int sizes[],struct device * alloc_devs[])422 static int rcar_drif_queue_setup(struct vb2_queue *vq,
423 unsigned int *num_buffers, unsigned int *num_planes,
424 unsigned int sizes[], struct device *alloc_devs[])
425 {
426 struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
427 unsigned int q_num_bufs = vb2_get_num_buffers(vq);
428
429 /* Need at least 16 buffers */
430 if (q_num_bufs + *num_buffers < 16)
431 *num_buffers = 16 - q_num_bufs;
432
433 *num_planes = 1;
434 sizes[0] = PAGE_ALIGN(sdr->fmt->buffersize);
435 rdrif_dbg(sdr, "num_bufs %d sizes[0] %d\n", *num_buffers, sizes[0]);
436
437 return 0;
438 }
439
440 /* Enqueue buffer */
rcar_drif_buf_queue(struct vb2_buffer * vb)441 static void rcar_drif_buf_queue(struct vb2_buffer *vb)
442 {
443 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
444 struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vb->vb2_queue);
445 struct rcar_drif_frame_buf *fbuf =
446 container_of(vbuf, struct rcar_drif_frame_buf, vb);
447 unsigned long flags;
448
449 rdrif_dbg(sdr, "buf_queue idx %u\n", vb->index);
450 spin_lock_irqsave(&sdr->queued_bufs_lock, flags);
451 list_add_tail(&fbuf->list, &sdr->queued_bufs);
452 spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
453 }
454
455 /* Get a frame buf from list */
456 static struct rcar_drif_frame_buf *
rcar_drif_get_fbuf(struct rcar_drif_sdr * sdr)457 rcar_drif_get_fbuf(struct rcar_drif_sdr *sdr)
458 {
459 struct rcar_drif_frame_buf *fbuf;
460 unsigned long flags;
461
462 spin_lock_irqsave(&sdr->queued_bufs_lock, flags);
463 fbuf = list_first_entry_or_null(&sdr->queued_bufs, struct
464 rcar_drif_frame_buf, list);
465 if (!fbuf) {
466 /*
467 * App is late in enqueing buffers. Samples lost & there will
468 * be a gap in sequence number when app recovers
469 */
470 rdrif_dbg(sdr, "\napp late: prod %u\n", sdr->produced);
471 spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
472 return NULL;
473 }
474 list_del(&fbuf->list);
475 spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
476
477 return fbuf;
478 }
479
480 /* Helpers to set/clear buf pair status */
rcar_drif_bufs_done(struct rcar_drif_hwbuf ** buf)481 static inline bool rcar_drif_bufs_done(struct rcar_drif_hwbuf **buf)
482 {
483 return (buf[0]->status & buf[1]->status & RCAR_DRIF_BUF_DONE);
484 }
485
rcar_drif_bufs_overflow(struct rcar_drif_hwbuf ** buf)486 static inline bool rcar_drif_bufs_overflow(struct rcar_drif_hwbuf **buf)
487 {
488 return ((buf[0]->status | buf[1]->status) & RCAR_DRIF_BUF_OVERFLOW);
489 }
490
rcar_drif_bufs_clear(struct rcar_drif_hwbuf ** buf,unsigned int bit)491 static inline void rcar_drif_bufs_clear(struct rcar_drif_hwbuf **buf,
492 unsigned int bit)
493 {
494 unsigned int i;
495
496 for (i = 0; i < RCAR_DRIF_MAX_CHANNEL; i++)
497 buf[i]->status &= ~bit;
498 }
499
500 /* Channel DMA complete */
rcar_drif_channel_complete(struct rcar_drif * ch,u32 idx)501 static void rcar_drif_channel_complete(struct rcar_drif *ch, u32 idx)
502 {
503 u32 str;
504
505 ch->buf[idx].status |= RCAR_DRIF_BUF_DONE;
506
507 /* Check for DRIF errors */
508 str = rcar_drif_read(ch, RCAR_DRIF_SISTR);
509 if (unlikely(str & RCAR_DRIF_RFOVF)) {
510 /* Writing the same clears it */
511 rcar_drif_write(ch, RCAR_DRIF_SISTR, str);
512
513 /* Overflow: some samples are lost */
514 ch->buf[idx].status |= RCAR_DRIF_BUF_OVERFLOW;
515 }
516 }
517
518 /* DMA callback for each stage */
rcar_drif_dma_complete(void * dma_async_param)519 static void rcar_drif_dma_complete(void *dma_async_param)
520 {
521 struct rcar_drif *ch = dma_async_param;
522 struct rcar_drif_sdr *sdr = ch->sdr;
523 struct rcar_drif_hwbuf *buf[RCAR_DRIF_MAX_CHANNEL];
524 struct rcar_drif_frame_buf *fbuf;
525 bool overflow = false;
526 u32 idx, produced;
527 unsigned int i;
528
529 spin_lock(&sdr->dma_lock);
530
531 /* DMA can be terminated while the callback was waiting on lock */
532 if (!vb2_is_streaming(&sdr->vb_queue)) {
533 spin_unlock(&sdr->dma_lock);
534 return;
535 }
536
537 idx = sdr->produced % RCAR_DRIF_NUM_HWBUFS;
538 rcar_drif_channel_complete(ch, idx);
539
540 if (sdr->num_cur_ch == RCAR_DRIF_MAX_CHANNEL) {
541 buf[0] = ch->num ? to_rcar_drif_buf_pair(sdr, ch->num, idx) :
542 &ch->buf[idx];
543 buf[1] = ch->num ? &ch->buf[idx] :
544 to_rcar_drif_buf_pair(sdr, ch->num, idx);
545
546 /* Check if both DMA buffers are done */
547 if (!rcar_drif_bufs_done(buf)) {
548 spin_unlock(&sdr->dma_lock);
549 return;
550 }
551
552 /* Clear buf done status */
553 rcar_drif_bufs_clear(buf, RCAR_DRIF_BUF_DONE);
554
555 if (rcar_drif_bufs_overflow(buf)) {
556 overflow = true;
557 /* Clear the flag in status */
558 rcar_drif_bufs_clear(buf, RCAR_DRIF_BUF_OVERFLOW);
559 }
560 } else {
561 buf[0] = &ch->buf[idx];
562 if (buf[0]->status & RCAR_DRIF_BUF_OVERFLOW) {
563 overflow = true;
564 /* Clear the flag in status */
565 buf[0]->status &= ~RCAR_DRIF_BUF_OVERFLOW;
566 }
567 }
568
569 /* Buffer produced for consumption */
570 produced = sdr->produced++;
571 spin_unlock(&sdr->dma_lock);
572
573 rdrif_dbg(sdr, "ch%u: prod %u\n", ch->num, produced);
574
575 /* Get fbuf */
576 fbuf = rcar_drif_get_fbuf(sdr);
577 if (!fbuf)
578 return;
579
580 for (i = 0; i < RCAR_DRIF_MAX_CHANNEL; i++)
581 memcpy(vb2_plane_vaddr(&fbuf->vb.vb2_buf, 0) +
582 i * sdr->hwbuf_size, buf[i]->addr, sdr->hwbuf_size);
583
584 fbuf->vb.field = V4L2_FIELD_NONE;
585 fbuf->vb.sequence = produced;
586 fbuf->vb.vb2_buf.timestamp = ktime_get_ns();
587 vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0, sdr->fmt->buffersize);
588
589 /* Set error state on overflow */
590 vb2_buffer_done(&fbuf->vb.vb2_buf,
591 overflow ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
592 }
593
rcar_drif_qbuf(struct rcar_drif * ch)594 static int rcar_drif_qbuf(struct rcar_drif *ch)
595 {
596 struct rcar_drif_sdr *sdr = ch->sdr;
597 dma_addr_t addr = ch->dma_handle;
598 struct dma_async_tx_descriptor *rxd;
599 dma_cookie_t cookie;
600 int ret = -EIO;
601
602 /* Setup cyclic DMA with given buffers */
603 rxd = dmaengine_prep_dma_cyclic(ch->dmach, addr,
604 sdr->hwbuf_size * RCAR_DRIF_NUM_HWBUFS,
605 sdr->hwbuf_size, DMA_DEV_TO_MEM,
606 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
607 if (!rxd) {
608 rdrif_err(sdr, "ch%u: prep dma cyclic failed\n", ch->num);
609 return ret;
610 }
611
612 /* Submit descriptor */
613 rxd->callback = rcar_drif_dma_complete;
614 rxd->callback_param = ch;
615 cookie = dmaengine_submit(rxd);
616 if (dma_submit_error(cookie)) {
617 rdrif_err(sdr, "ch%u: dma submit failed\n", ch->num);
618 return ret;
619 }
620
621 dma_async_issue_pending(ch->dmach);
622 return 0;
623 }
624
625 /* Enable reception */
rcar_drif_enable_rx(struct rcar_drif_sdr * sdr)626 static int rcar_drif_enable_rx(struct rcar_drif_sdr *sdr)
627 {
628 unsigned int i;
629 u32 ctr;
630 int ret = -EINVAL;
631
632 /*
633 * When both internal channels are enabled, they can be synchronized
634 * only by the master
635 */
636
637 /* Enable receive */
638 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
639 ctr = rcar_drif_read(sdr->ch[i], RCAR_DRIF_SICTR);
640 ctr |= (RCAR_DRIF_SICTR_RX_RISING_EDGE |
641 RCAR_DRIF_SICTR_RX_EN);
642 rcar_drif_write(sdr->ch[i], RCAR_DRIF_SICTR, ctr);
643 }
644
645 /* Check receive enabled */
646 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
647 ret = readl_poll_timeout(sdr->ch[i]->base + RCAR_DRIF_SICTR,
648 ctr, ctr & RCAR_DRIF_SICTR_RX_EN, 7, 100000);
649 if (ret) {
650 rdrif_err(sdr, "ch%u: rx en failed. ctr 0x%08x\n", i,
651 rcar_drif_read(sdr->ch[i], RCAR_DRIF_SICTR));
652 break;
653 }
654 }
655 return ret;
656 }
657
658 /* Disable reception */
rcar_drif_disable_rx(struct rcar_drif_sdr * sdr)659 static void rcar_drif_disable_rx(struct rcar_drif_sdr *sdr)
660 {
661 unsigned int i;
662 u32 ctr;
663 int ret;
664
665 /* Disable receive */
666 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
667 ctr = rcar_drif_read(sdr->ch[i], RCAR_DRIF_SICTR);
668 ctr &= ~RCAR_DRIF_SICTR_RX_EN;
669 rcar_drif_write(sdr->ch[i], RCAR_DRIF_SICTR, ctr);
670 }
671
672 /* Check receive disabled */
673 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
674 ret = readl_poll_timeout(sdr->ch[i]->base + RCAR_DRIF_SICTR,
675 ctr, !(ctr & RCAR_DRIF_SICTR_RX_EN), 7, 100000);
676 if (ret)
677 dev_warn(&sdr->vdev->dev,
678 "ch%u: failed to disable rx. ctr 0x%08x\n",
679 i, rcar_drif_read(sdr->ch[i], RCAR_DRIF_SICTR));
680 }
681 }
682
683 /* Stop channel */
rcar_drif_stop_channel(struct rcar_drif * ch)684 static void rcar_drif_stop_channel(struct rcar_drif *ch)
685 {
686 /* Disable DMA receive interrupt */
687 rcar_drif_write(ch, RCAR_DRIF_SIIER, 0x00000000);
688
689 /* Terminate all DMA transfers */
690 dmaengine_terminate_sync(ch->dmach);
691 }
692
693 /* Stop receive operation */
rcar_drif_stop(struct rcar_drif_sdr * sdr)694 static void rcar_drif_stop(struct rcar_drif_sdr *sdr)
695 {
696 unsigned int i;
697
698 /* Disable Rx */
699 rcar_drif_disable_rx(sdr);
700
701 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask)
702 rcar_drif_stop_channel(sdr->ch[i]);
703 }
704
705 /* Start channel */
rcar_drif_start_channel(struct rcar_drif * ch)706 static int rcar_drif_start_channel(struct rcar_drif *ch)
707 {
708 struct rcar_drif_sdr *sdr = ch->sdr;
709 u32 ctr, str;
710 int ret;
711
712 /* Reset receive */
713 rcar_drif_write(ch, RCAR_DRIF_SICTR, RCAR_DRIF_SICTR_RESET);
714 ret = readl_poll_timeout(ch->base + RCAR_DRIF_SICTR, ctr,
715 !(ctr & RCAR_DRIF_SICTR_RESET), 7, 100000);
716 if (ret) {
717 rdrif_err(sdr, "ch%u: failed to reset rx. ctr 0x%08x\n",
718 ch->num, rcar_drif_read(ch, RCAR_DRIF_SICTR));
719 return ret;
720 }
721
722 /* Queue buffers for DMA */
723 ret = rcar_drif_qbuf(ch);
724 if (ret)
725 return ret;
726
727 /* Clear status register flags */
728 str = RCAR_DRIF_RFFUL | RCAR_DRIF_REOF | RCAR_DRIF_RFSERR |
729 RCAR_DRIF_RFUDF | RCAR_DRIF_RFOVF;
730 rcar_drif_write(ch, RCAR_DRIF_SISTR, str);
731
732 /* Enable DMA receive interrupt */
733 rcar_drif_write(ch, RCAR_DRIF_SIIER, 0x00009000);
734
735 return ret;
736 }
737
738 /* Start receive operation */
rcar_drif_start(struct rcar_drif_sdr * sdr)739 static int rcar_drif_start(struct rcar_drif_sdr *sdr)
740 {
741 unsigned long enabled = 0;
742 unsigned int i;
743 int ret;
744
745 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
746 ret = rcar_drif_start_channel(sdr->ch[i]);
747 if (ret)
748 goto start_error;
749 enabled |= BIT(i);
750 }
751
752 ret = rcar_drif_enable_rx(sdr);
753 if (ret)
754 goto enable_error;
755
756 sdr->produced = 0;
757 return ret;
758
759 enable_error:
760 rcar_drif_disable_rx(sdr);
761 start_error:
762 for_each_rcar_drif_channel(i, &enabled)
763 rcar_drif_stop_channel(sdr->ch[i]);
764
765 return ret;
766 }
767
768 /* Start streaming */
rcar_drif_start_streaming(struct vb2_queue * vq,unsigned int count)769 static int rcar_drif_start_streaming(struct vb2_queue *vq, unsigned int count)
770 {
771 struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
772 unsigned long enabled = 0;
773 unsigned int i;
774 int ret;
775
776 mutex_lock(&sdr->v4l2_mutex);
777
778 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
779 ret = clk_prepare_enable(sdr->ch[i]->clk);
780 if (ret)
781 goto error;
782 enabled |= BIT(i);
783 }
784
785 /* Set default MDRx settings */
786 rcar_drif_set_mdr1(sdr);
787
788 /* Set new format */
789 ret = rcar_drif_set_format(sdr);
790 if (ret)
791 goto error;
792
793 if (sdr->num_cur_ch == RCAR_DRIF_MAX_CHANNEL)
794 sdr->hwbuf_size = sdr->fmt->buffersize / RCAR_DRIF_MAX_CHANNEL;
795 else
796 sdr->hwbuf_size = sdr->fmt->buffersize;
797
798 rdrif_dbg(sdr, "num hwbufs %u, hwbuf_size %u\n",
799 RCAR_DRIF_NUM_HWBUFS, sdr->hwbuf_size);
800
801 /* Alloc DMA channel */
802 ret = rcar_drif_alloc_dmachannels(sdr);
803 if (ret)
804 goto error;
805
806 /* Request buffers */
807 ret = rcar_drif_request_buf(sdr);
808 if (ret)
809 goto error;
810
811 /* Start Rx */
812 ret = rcar_drif_start(sdr);
813 if (ret)
814 goto error;
815
816 mutex_unlock(&sdr->v4l2_mutex);
817
818 return ret;
819
820 error:
821 rcar_drif_release_queued_bufs(sdr, VB2_BUF_STATE_QUEUED);
822 rcar_drif_release_buf(sdr);
823 rcar_drif_release_dmachannels(sdr);
824 for_each_rcar_drif_channel(i, &enabled)
825 clk_disable_unprepare(sdr->ch[i]->clk);
826
827 mutex_unlock(&sdr->v4l2_mutex);
828
829 return ret;
830 }
831
832 /* Stop streaming */
rcar_drif_stop_streaming(struct vb2_queue * vq)833 static void rcar_drif_stop_streaming(struct vb2_queue *vq)
834 {
835 struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
836 unsigned int i;
837
838 mutex_lock(&sdr->v4l2_mutex);
839
840 /* Stop hardware streaming */
841 rcar_drif_stop(sdr);
842
843 /* Return all queued buffers to vb2 */
844 rcar_drif_release_queued_bufs(sdr, VB2_BUF_STATE_ERROR);
845
846 /* Release buf */
847 rcar_drif_release_buf(sdr);
848
849 /* Release DMA channel resources */
850 rcar_drif_release_dmachannels(sdr);
851
852 for_each_rcar_drif_channel(i, &sdr->cur_ch_mask)
853 clk_disable_unprepare(sdr->ch[i]->clk);
854
855 mutex_unlock(&sdr->v4l2_mutex);
856 }
857
858 /* Vb2 ops */
859 static const struct vb2_ops rcar_drif_vb2_ops = {
860 .queue_setup = rcar_drif_queue_setup,
861 .buf_queue = rcar_drif_buf_queue,
862 .start_streaming = rcar_drif_start_streaming,
863 .stop_streaming = rcar_drif_stop_streaming,
864 .wait_prepare = vb2_ops_wait_prepare,
865 .wait_finish = vb2_ops_wait_finish,
866 };
867
rcar_drif_querycap(struct file * file,void * fh,struct v4l2_capability * cap)868 static int rcar_drif_querycap(struct file *file, void *fh,
869 struct v4l2_capability *cap)
870 {
871 struct rcar_drif_sdr *sdr = video_drvdata(file);
872
873 strscpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
874 strscpy(cap->card, sdr->vdev->name, sizeof(cap->card));
875 strscpy(cap->bus_info, "platform:R-Car DRIF", sizeof(cap->bus_info));
876
877 return 0;
878 }
879
rcar_drif_set_default_format(struct rcar_drif_sdr * sdr)880 static int rcar_drif_set_default_format(struct rcar_drif_sdr *sdr)
881 {
882 unsigned int i;
883
884 for (i = 0; i < ARRAY_SIZE(formats); i++) {
885 /* Matching fmt based on required channels is set as default */
886 if (sdr->num_hw_ch == formats[i].num_ch) {
887 sdr->fmt = &formats[i];
888 sdr->cur_ch_mask = sdr->hw_ch_mask;
889 sdr->num_cur_ch = sdr->num_hw_ch;
890 dev_dbg(sdr->dev, "default fmt[%u]: mask %lu num %u\n",
891 i, sdr->cur_ch_mask, sdr->num_cur_ch);
892 return 0;
893 }
894 }
895 return -EINVAL;
896 }
897
rcar_drif_enum_fmt_sdr_cap(struct file * file,void * priv,struct v4l2_fmtdesc * f)898 static int rcar_drif_enum_fmt_sdr_cap(struct file *file, void *priv,
899 struct v4l2_fmtdesc *f)
900 {
901 if (f->index >= ARRAY_SIZE(formats))
902 return -EINVAL;
903
904 f->pixelformat = formats[f->index].pixelformat;
905
906 return 0;
907 }
908
rcar_drif_g_fmt_sdr_cap(struct file * file,void * priv,struct v4l2_format * f)909 static int rcar_drif_g_fmt_sdr_cap(struct file *file, void *priv,
910 struct v4l2_format *f)
911 {
912 struct rcar_drif_sdr *sdr = video_drvdata(file);
913
914 f->fmt.sdr.pixelformat = sdr->fmt->pixelformat;
915 f->fmt.sdr.buffersize = sdr->fmt->buffersize;
916
917 return 0;
918 }
919
rcar_drif_s_fmt_sdr_cap(struct file * file,void * priv,struct v4l2_format * f)920 static int rcar_drif_s_fmt_sdr_cap(struct file *file, void *priv,
921 struct v4l2_format *f)
922 {
923 struct rcar_drif_sdr *sdr = video_drvdata(file);
924 struct vb2_queue *q = &sdr->vb_queue;
925 unsigned int i;
926
927 if (vb2_is_busy(q))
928 return -EBUSY;
929
930 for (i = 0; i < ARRAY_SIZE(formats); i++) {
931 if (formats[i].pixelformat == f->fmt.sdr.pixelformat)
932 break;
933 }
934
935 if (i == ARRAY_SIZE(formats))
936 i = 0; /* Set the 1st format as default on no match */
937
938 sdr->fmt = &formats[i];
939 f->fmt.sdr.pixelformat = sdr->fmt->pixelformat;
940 f->fmt.sdr.buffersize = formats[i].buffersize;
941 memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
942
943 /*
944 * If a format demands one channel only out of two
945 * enabled channels, pick the 0th channel.
946 */
947 if (formats[i].num_ch < sdr->num_hw_ch) {
948 sdr->cur_ch_mask = BIT(0);
949 sdr->num_cur_ch = formats[i].num_ch;
950 } else {
951 sdr->cur_ch_mask = sdr->hw_ch_mask;
952 sdr->num_cur_ch = sdr->num_hw_ch;
953 }
954
955 rdrif_dbg(sdr, "cur: idx %u mask %lu num %u\n",
956 i, sdr->cur_ch_mask, sdr->num_cur_ch);
957
958 return 0;
959 }
960
rcar_drif_try_fmt_sdr_cap(struct file * file,void * priv,struct v4l2_format * f)961 static int rcar_drif_try_fmt_sdr_cap(struct file *file, void *priv,
962 struct v4l2_format *f)
963 {
964 unsigned int i;
965
966 for (i = 0; i < ARRAY_SIZE(formats); i++) {
967 if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
968 f->fmt.sdr.buffersize = formats[i].buffersize;
969 return 0;
970 }
971 }
972
973 f->fmt.sdr.pixelformat = formats[0].pixelformat;
974 f->fmt.sdr.buffersize = formats[0].buffersize;
975 memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
976
977 return 0;
978 }
979
980 /* Tuner subdev ioctls */
rcar_drif_enum_freq_bands(struct file * file,void * priv,struct v4l2_frequency_band * band)981 static int rcar_drif_enum_freq_bands(struct file *file, void *priv,
982 struct v4l2_frequency_band *band)
983 {
984 struct rcar_drif_sdr *sdr = video_drvdata(file);
985
986 return v4l2_subdev_call(sdr->ep.subdev, tuner, enum_freq_bands, band);
987 }
988
rcar_drif_g_frequency(struct file * file,void * priv,struct v4l2_frequency * f)989 static int rcar_drif_g_frequency(struct file *file, void *priv,
990 struct v4l2_frequency *f)
991 {
992 struct rcar_drif_sdr *sdr = video_drvdata(file);
993
994 return v4l2_subdev_call(sdr->ep.subdev, tuner, g_frequency, f);
995 }
996
rcar_drif_s_frequency(struct file * file,void * priv,const struct v4l2_frequency * f)997 static int rcar_drif_s_frequency(struct file *file, void *priv,
998 const struct v4l2_frequency *f)
999 {
1000 struct rcar_drif_sdr *sdr = video_drvdata(file);
1001
1002 return v4l2_subdev_call(sdr->ep.subdev, tuner, s_frequency, f);
1003 }
1004
rcar_drif_g_tuner(struct file * file,void * priv,struct v4l2_tuner * vt)1005 static int rcar_drif_g_tuner(struct file *file, void *priv,
1006 struct v4l2_tuner *vt)
1007 {
1008 struct rcar_drif_sdr *sdr = video_drvdata(file);
1009
1010 return v4l2_subdev_call(sdr->ep.subdev, tuner, g_tuner, vt);
1011 }
1012
rcar_drif_s_tuner(struct file * file,void * priv,const struct v4l2_tuner * vt)1013 static int rcar_drif_s_tuner(struct file *file, void *priv,
1014 const struct v4l2_tuner *vt)
1015 {
1016 struct rcar_drif_sdr *sdr = video_drvdata(file);
1017
1018 return v4l2_subdev_call(sdr->ep.subdev, tuner, s_tuner, vt);
1019 }
1020
1021 static const struct v4l2_ioctl_ops rcar_drif_ioctl_ops = {
1022 .vidioc_querycap = rcar_drif_querycap,
1023
1024 .vidioc_enum_fmt_sdr_cap = rcar_drif_enum_fmt_sdr_cap,
1025 .vidioc_g_fmt_sdr_cap = rcar_drif_g_fmt_sdr_cap,
1026 .vidioc_s_fmt_sdr_cap = rcar_drif_s_fmt_sdr_cap,
1027 .vidioc_try_fmt_sdr_cap = rcar_drif_try_fmt_sdr_cap,
1028
1029 .vidioc_reqbufs = vb2_ioctl_reqbufs,
1030 .vidioc_create_bufs = vb2_ioctl_create_bufs,
1031 .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
1032 .vidioc_querybuf = vb2_ioctl_querybuf,
1033 .vidioc_qbuf = vb2_ioctl_qbuf,
1034 .vidioc_dqbuf = vb2_ioctl_dqbuf,
1035
1036 .vidioc_streamon = vb2_ioctl_streamon,
1037 .vidioc_streamoff = vb2_ioctl_streamoff,
1038
1039 .vidioc_s_frequency = rcar_drif_s_frequency,
1040 .vidioc_g_frequency = rcar_drif_g_frequency,
1041 .vidioc_s_tuner = rcar_drif_s_tuner,
1042 .vidioc_g_tuner = rcar_drif_g_tuner,
1043 .vidioc_enum_freq_bands = rcar_drif_enum_freq_bands,
1044 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1045 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1046 .vidioc_log_status = v4l2_ctrl_log_status,
1047 };
1048
1049 static const struct v4l2_file_operations rcar_drif_fops = {
1050 .owner = THIS_MODULE,
1051 .open = v4l2_fh_open,
1052 .release = vb2_fop_release,
1053 .read = vb2_fop_read,
1054 .poll = vb2_fop_poll,
1055 .mmap = vb2_fop_mmap,
1056 .unlocked_ioctl = video_ioctl2,
1057 };
1058
rcar_drif_sdr_register(struct rcar_drif_sdr * sdr)1059 static int rcar_drif_sdr_register(struct rcar_drif_sdr *sdr)
1060 {
1061 int ret;
1062
1063 /* Init video_device structure */
1064 sdr->vdev = video_device_alloc();
1065 if (!sdr->vdev)
1066 return -ENOMEM;
1067
1068 snprintf(sdr->vdev->name, sizeof(sdr->vdev->name), "R-Car DRIF");
1069 sdr->vdev->fops = &rcar_drif_fops;
1070 sdr->vdev->ioctl_ops = &rcar_drif_ioctl_ops;
1071 sdr->vdev->release = video_device_release;
1072 sdr->vdev->lock = &sdr->v4l2_mutex;
1073 sdr->vdev->queue = &sdr->vb_queue;
1074 sdr->vdev->queue->lock = &sdr->vb_queue_mutex;
1075 sdr->vdev->ctrl_handler = &sdr->ctrl_hdl;
1076 sdr->vdev->v4l2_dev = &sdr->v4l2_dev;
1077 sdr->vdev->device_caps = V4L2_CAP_SDR_CAPTURE | V4L2_CAP_TUNER |
1078 V4L2_CAP_STREAMING | V4L2_CAP_READWRITE;
1079 video_set_drvdata(sdr->vdev, sdr);
1080
1081 /* Register V4L2 SDR device */
1082 ret = video_register_device(sdr->vdev, VFL_TYPE_SDR, -1);
1083 if (ret) {
1084 video_device_release(sdr->vdev);
1085 sdr->vdev = NULL;
1086 dev_err(sdr->dev, "failed video_register_device (%d)\n", ret);
1087 }
1088
1089 return ret;
1090 }
1091
rcar_drif_sdr_unregister(struct rcar_drif_sdr * sdr)1092 static void rcar_drif_sdr_unregister(struct rcar_drif_sdr *sdr)
1093 {
1094 video_unregister_device(sdr->vdev);
1095 sdr->vdev = NULL;
1096 }
1097
1098 /* Sub-device bound callback */
rcar_drif_notify_bound(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)1099 static int rcar_drif_notify_bound(struct v4l2_async_notifier *notifier,
1100 struct v4l2_subdev *subdev,
1101 struct v4l2_async_connection *asd)
1102 {
1103 struct rcar_drif_sdr *sdr =
1104 container_of(notifier, struct rcar_drif_sdr, notifier);
1105
1106 v4l2_set_subdev_hostdata(subdev, sdr);
1107 sdr->ep.subdev = subdev;
1108 rdrif_dbg(sdr, "bound asd %s\n", subdev->name);
1109
1110 return 0;
1111 }
1112
1113 /* Sub-device unbind callback */
rcar_drif_notify_unbind(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)1114 static void rcar_drif_notify_unbind(struct v4l2_async_notifier *notifier,
1115 struct v4l2_subdev *subdev,
1116 struct v4l2_async_connection *asd)
1117 {
1118 struct rcar_drif_sdr *sdr =
1119 container_of(notifier, struct rcar_drif_sdr, notifier);
1120
1121 if (sdr->ep.subdev != subdev) {
1122 rdrif_err(sdr, "subdev %s is not bound\n", subdev->name);
1123 return;
1124 }
1125
1126 /* Free ctrl handler if initialized */
1127 v4l2_ctrl_handler_free(&sdr->ctrl_hdl);
1128 sdr->v4l2_dev.ctrl_handler = NULL;
1129 sdr->ep.subdev = NULL;
1130
1131 rcar_drif_sdr_unregister(sdr);
1132 rdrif_dbg(sdr, "unbind asd %s\n", subdev->name);
1133 }
1134
1135 /* Sub-device registered notification callback */
rcar_drif_notify_complete(struct v4l2_async_notifier * notifier)1136 static int rcar_drif_notify_complete(struct v4l2_async_notifier *notifier)
1137 {
1138 struct rcar_drif_sdr *sdr =
1139 container_of(notifier, struct rcar_drif_sdr, notifier);
1140 int ret;
1141
1142 /*
1143 * The subdev tested at this point uses 4 controls. Using 10 as a worst
1144 * case scenario hint. When less controls are needed there will be some
1145 * unused memory and when more controls are needed the framework uses
1146 * hash to manage controls within this number.
1147 */
1148 ret = v4l2_ctrl_handler_init(&sdr->ctrl_hdl, 10);
1149 if (ret)
1150 return -ENOMEM;
1151
1152 sdr->v4l2_dev.ctrl_handler = &sdr->ctrl_hdl;
1153 ret = v4l2_device_register_subdev_nodes(&sdr->v4l2_dev);
1154 if (ret) {
1155 rdrif_err(sdr, "failed: register subdev nodes ret %d\n", ret);
1156 goto error;
1157 }
1158
1159 ret = v4l2_ctrl_add_handler(&sdr->ctrl_hdl,
1160 sdr->ep.subdev->ctrl_handler, NULL, true);
1161 if (ret) {
1162 rdrif_err(sdr, "failed: ctrl add hdlr ret %d\n", ret);
1163 goto error;
1164 }
1165
1166 ret = rcar_drif_sdr_register(sdr);
1167 if (ret)
1168 goto error;
1169
1170 return ret;
1171
1172 error:
1173 v4l2_ctrl_handler_free(&sdr->ctrl_hdl);
1174
1175 return ret;
1176 }
1177
1178 static const struct v4l2_async_notifier_operations rcar_drif_notify_ops = {
1179 .bound = rcar_drif_notify_bound,
1180 .unbind = rcar_drif_notify_unbind,
1181 .complete = rcar_drif_notify_complete,
1182 };
1183
1184 /* Read endpoint properties */
rcar_drif_get_ep_properties(struct rcar_drif_sdr * sdr,struct fwnode_handle * fwnode)1185 static void rcar_drif_get_ep_properties(struct rcar_drif_sdr *sdr,
1186 struct fwnode_handle *fwnode)
1187 {
1188 u32 val;
1189
1190 /* Set the I2S defaults for SIRMDR1*/
1191 sdr->mdr1 = RCAR_DRIF_SIRMDR1_SYNCMD_LR | RCAR_DRIF_SIRMDR1_MSB_FIRST |
1192 RCAR_DRIF_SIRMDR1_DTDL_1 | RCAR_DRIF_SIRMDR1_SYNCDL_0;
1193
1194 /* Parse sync polarity from endpoint */
1195 if (!fwnode_property_read_u32(fwnode, "sync-active", &val))
1196 sdr->mdr1 |= val ? RCAR_DRIF_SIRMDR1_SYNCAC_POL_HIGH :
1197 RCAR_DRIF_SIRMDR1_SYNCAC_POL_LOW;
1198 else
1199 sdr->mdr1 |= RCAR_DRIF_SIRMDR1_SYNCAC_POL_HIGH; /* default */
1200
1201 dev_dbg(sdr->dev, "mdr1 0x%08x\n", sdr->mdr1);
1202 }
1203
1204 /* Parse sub-devs (tuner) to find a matching device */
rcar_drif_parse_subdevs(struct rcar_drif_sdr * sdr)1205 static int rcar_drif_parse_subdevs(struct rcar_drif_sdr *sdr)
1206 {
1207 struct v4l2_async_notifier *notifier = &sdr->notifier;
1208 struct fwnode_handle *fwnode, *ep;
1209 struct v4l2_async_connection *asd;
1210
1211 v4l2_async_nf_init(&sdr->notifier, &sdr->v4l2_dev);
1212
1213 ep = fwnode_graph_get_next_endpoint(of_fwnode_handle(sdr->dev->of_node),
1214 NULL);
1215 if (!ep)
1216 return 0;
1217
1218 /* Get the endpoint properties */
1219 rcar_drif_get_ep_properties(sdr, ep);
1220
1221 fwnode = fwnode_graph_get_remote_port_parent(ep);
1222 fwnode_handle_put(ep);
1223 if (!fwnode) {
1224 dev_warn(sdr->dev, "bad remote port parent\n");
1225 return -EINVAL;
1226 }
1227
1228 asd = v4l2_async_nf_add_fwnode(notifier, fwnode,
1229 struct v4l2_async_connection);
1230 fwnode_handle_put(fwnode);
1231 if (IS_ERR(asd))
1232 return PTR_ERR(asd);
1233
1234 return 0;
1235 }
1236
1237 /* Check if the given device is the primary bond */
rcar_drif_primary_bond(struct platform_device * pdev)1238 static bool rcar_drif_primary_bond(struct platform_device *pdev)
1239 {
1240 return of_property_read_bool(pdev->dev.of_node, "renesas,primary-bond");
1241 }
1242
1243 /* Check if both devices of the bond are enabled */
rcar_drif_bond_enabled(struct platform_device * p)1244 static struct device_node *rcar_drif_bond_enabled(struct platform_device *p)
1245 {
1246 struct device_node *np;
1247
1248 np = of_parse_phandle(p->dev.of_node, "renesas,bonding", 0);
1249 if (np && of_device_is_available(np))
1250 return np;
1251
1252 return NULL;
1253 }
1254
1255 /* Check if the bonded device is probed */
rcar_drif_bond_available(struct rcar_drif_sdr * sdr,struct device_node * np)1256 static int rcar_drif_bond_available(struct rcar_drif_sdr *sdr,
1257 struct device_node *np)
1258 {
1259 struct platform_device *pdev;
1260 struct rcar_drif *ch;
1261 int ret = 0;
1262
1263 pdev = of_find_device_by_node(np);
1264 if (!pdev) {
1265 dev_err(sdr->dev, "failed to get bonded device from node\n");
1266 return -ENODEV;
1267 }
1268
1269 device_lock(&pdev->dev);
1270 ch = platform_get_drvdata(pdev);
1271 if (ch) {
1272 /* Update sdr data in the bonded device */
1273 ch->sdr = sdr;
1274
1275 /* Update sdr with bonded device data */
1276 sdr->ch[ch->num] = ch;
1277 sdr->hw_ch_mask |= BIT(ch->num);
1278 } else {
1279 /* Defer */
1280 dev_info(sdr->dev, "defer probe\n");
1281 ret = -EPROBE_DEFER;
1282 }
1283 device_unlock(&pdev->dev);
1284
1285 put_device(&pdev->dev);
1286
1287 return ret;
1288 }
1289
1290 /* V4L2 SDR device probe */
rcar_drif_sdr_probe(struct rcar_drif_sdr * sdr)1291 static int rcar_drif_sdr_probe(struct rcar_drif_sdr *sdr)
1292 {
1293 int ret;
1294
1295 /* Validate any supported format for enabled channels */
1296 ret = rcar_drif_set_default_format(sdr);
1297 if (ret) {
1298 dev_err(sdr->dev, "failed to set default format\n");
1299 return ret;
1300 }
1301
1302 /* Set defaults */
1303 sdr->hwbuf_size = RCAR_DRIF_DEFAULT_HWBUF_SIZE;
1304
1305 mutex_init(&sdr->v4l2_mutex);
1306 mutex_init(&sdr->vb_queue_mutex);
1307 spin_lock_init(&sdr->queued_bufs_lock);
1308 spin_lock_init(&sdr->dma_lock);
1309 INIT_LIST_HEAD(&sdr->queued_bufs);
1310
1311 /* Init videobuf2 queue structure */
1312 sdr->vb_queue.type = V4L2_BUF_TYPE_SDR_CAPTURE;
1313 sdr->vb_queue.io_modes = VB2_READ | VB2_MMAP | VB2_DMABUF;
1314 sdr->vb_queue.drv_priv = sdr;
1315 sdr->vb_queue.buf_struct_size = sizeof(struct rcar_drif_frame_buf);
1316 sdr->vb_queue.ops = &rcar_drif_vb2_ops;
1317 sdr->vb_queue.mem_ops = &vb2_vmalloc_memops;
1318 sdr->vb_queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1319
1320 /* Init videobuf2 queue */
1321 ret = vb2_queue_init(&sdr->vb_queue);
1322 if (ret) {
1323 dev_err(sdr->dev, "failed: vb2_queue_init ret %d\n", ret);
1324 return ret;
1325 }
1326
1327 /* Register the v4l2_device */
1328 ret = v4l2_device_register(sdr->dev, &sdr->v4l2_dev);
1329 if (ret) {
1330 dev_err(sdr->dev, "failed: v4l2_device_register ret %d\n", ret);
1331 return ret;
1332 }
1333
1334 /*
1335 * Parse subdevs after v4l2_device_register because if the subdev
1336 * is already probed, bound and complete will be called immediately
1337 */
1338 ret = rcar_drif_parse_subdevs(sdr);
1339 if (ret)
1340 goto error;
1341
1342 sdr->notifier.ops = &rcar_drif_notify_ops;
1343
1344 /* Register notifier */
1345 ret = v4l2_async_nf_register(&sdr->notifier);
1346 if (ret < 0) {
1347 dev_err(sdr->dev, "failed: notifier register ret %d\n", ret);
1348 goto cleanup;
1349 }
1350
1351 return ret;
1352
1353 cleanup:
1354 v4l2_async_nf_cleanup(&sdr->notifier);
1355 error:
1356 v4l2_device_unregister(&sdr->v4l2_dev);
1357
1358 return ret;
1359 }
1360
1361 /* V4L2 SDR device remove */
rcar_drif_sdr_remove(struct rcar_drif_sdr * sdr)1362 static void rcar_drif_sdr_remove(struct rcar_drif_sdr *sdr)
1363 {
1364 v4l2_async_nf_unregister(&sdr->notifier);
1365 v4l2_async_nf_cleanup(&sdr->notifier);
1366 v4l2_device_unregister(&sdr->v4l2_dev);
1367 }
1368
1369 /* DRIF channel probe */
rcar_drif_probe(struct platform_device * pdev)1370 static int rcar_drif_probe(struct platform_device *pdev)
1371 {
1372 struct rcar_drif_sdr *sdr;
1373 struct device_node *np;
1374 struct rcar_drif *ch;
1375 struct resource *res;
1376 int ret;
1377
1378 /* Reserve memory for enabled channel */
1379 ch = devm_kzalloc(&pdev->dev, sizeof(*ch), GFP_KERNEL);
1380 if (!ch)
1381 return -ENOMEM;
1382
1383 ch->pdev = pdev;
1384
1385 /* Module clock */
1386 ch->clk = devm_clk_get(&pdev->dev, "fck");
1387 if (IS_ERR(ch->clk)) {
1388 ret = PTR_ERR(ch->clk);
1389 dev_err(&pdev->dev, "clk get failed (%d)\n", ret);
1390 return ret;
1391 }
1392
1393 /* Register map */
1394 ch->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1395 if (IS_ERR(ch->base))
1396 return PTR_ERR(ch->base);
1397
1398 ch->start = res->start;
1399 platform_set_drvdata(pdev, ch);
1400
1401 /* Check if both channels of the bond are enabled */
1402 np = rcar_drif_bond_enabled(pdev);
1403 if (np) {
1404 /* Check if current channel acting as primary-bond */
1405 if (!rcar_drif_primary_bond(pdev)) {
1406 ch->num = 1; /* Primary bond is channel 0 always */
1407 of_node_put(np);
1408 return 0;
1409 }
1410 }
1411
1412 /* Reserve memory for SDR structure */
1413 sdr = devm_kzalloc(&pdev->dev, sizeof(*sdr), GFP_KERNEL);
1414 if (!sdr) {
1415 of_node_put(np);
1416 return -ENOMEM;
1417 }
1418 ch->sdr = sdr;
1419 sdr->dev = &pdev->dev;
1420
1421 /* Establish links between SDR and channel(s) */
1422 sdr->ch[ch->num] = ch;
1423 sdr->hw_ch_mask = BIT(ch->num);
1424 if (np) {
1425 /* Check if bonded device is ready */
1426 ret = rcar_drif_bond_available(sdr, np);
1427 of_node_put(np);
1428 if (ret)
1429 return ret;
1430 }
1431 sdr->num_hw_ch = hweight_long(sdr->hw_ch_mask);
1432
1433 return rcar_drif_sdr_probe(sdr);
1434 }
1435
1436 /* DRIF channel remove */
rcar_drif_remove(struct platform_device * pdev)1437 static void rcar_drif_remove(struct platform_device *pdev)
1438 {
1439 struct rcar_drif *ch = platform_get_drvdata(pdev);
1440 struct rcar_drif_sdr *sdr = ch->sdr;
1441
1442 /* Channel 0 will be the SDR instance */
1443 if (ch->num)
1444 return;
1445
1446 /* SDR instance */
1447 rcar_drif_sdr_remove(sdr);
1448 }
1449
1450 /* FIXME: Implement suspend/resume support */
rcar_drif_suspend(struct device * dev)1451 static int __maybe_unused rcar_drif_suspend(struct device *dev)
1452 {
1453 return 0;
1454 }
1455
rcar_drif_resume(struct device * dev)1456 static int __maybe_unused rcar_drif_resume(struct device *dev)
1457 {
1458 return 0;
1459 }
1460
1461 static SIMPLE_DEV_PM_OPS(rcar_drif_pm_ops, rcar_drif_suspend,
1462 rcar_drif_resume);
1463
1464 static const struct of_device_id rcar_drif_of_table[] = {
1465 { .compatible = "renesas,rcar-gen3-drif" },
1466 { }
1467 };
1468 MODULE_DEVICE_TABLE(of, rcar_drif_of_table);
1469
1470 #define RCAR_DRIF_DRV_NAME "rcar_drif"
1471 static struct platform_driver rcar_drif_driver = {
1472 .driver = {
1473 .name = RCAR_DRIF_DRV_NAME,
1474 .of_match_table = rcar_drif_of_table,
1475 .pm = &rcar_drif_pm_ops,
1476 },
1477 .probe = rcar_drif_probe,
1478 .remove_new = rcar_drif_remove,
1479 };
1480
1481 module_platform_driver(rcar_drif_driver);
1482
1483 MODULE_DESCRIPTION("Renesas R-Car Gen3 DRIF driver");
1484 MODULE_ALIAS("platform:" RCAR_DRIF_DRV_NAME);
1485 MODULE_LICENSE("GPL");
1486 MODULE_AUTHOR("Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>");
1487