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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / media / platform / exynos4-is / mipi-csis.c
blobcba46a65633836d5632c61107e7e8dbecdf1b39b
1 /*
2 * Samsung S5P/EXYNOS SoC series MIPI-CSI receiver driver
3 *
4 * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
5 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/clk.h>
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/errno.h>
16 #include <linux/interrupt.h>
17 #include <linux/io.h>
18 #include <linux/irq.h>
19 #include <linux/kernel.h>
20 #include <linux/memory.h>
21 #include <linux/module.h>
22 #include <linux/of.h>
23 #include <linux/of_graph.h>
24 #include <linux/phy/phy.h>
25 #include <linux/platform_device.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/regulator/consumer.h>
28 #include <linux/sizes.h>
29 #include <linux/slab.h>
30 #include <linux/spinlock.h>
31 #include <linux/videodev2.h>
32 #include <media/drv-intf/exynos-fimc.h>
33 #include <media/v4l2-fwnode.h>
34 #include <media/v4l2-subdev.h>
35
36 #include "mipi-csis.h"
37
38 static int debug;
39 module_param(debug, int, 0644);
40 MODULE_PARM_DESC(debug, "Debug level (0-2)");
41
42 /* Register map definition */
43
44 /* CSIS global control */
45 #define S5PCSIS_CTRL 0x00
46 #define S5PCSIS_CTRL_DPDN_DEFAULT (0 << 31)
47 #define S5PCSIS_CTRL_DPDN_SWAP (1 << 31)
48 #define S5PCSIS_CTRL_ALIGN_32BIT (1 << 20)
49 #define S5PCSIS_CTRL_UPDATE_SHADOW (1 << 16)
50 #define S5PCSIS_CTRL_WCLK_EXTCLK (1 << 8)
51 #define S5PCSIS_CTRL_RESET (1 << 4)
52 #define S5PCSIS_CTRL_ENABLE (1 << 0)
53
54 /* D-PHY control */
55 #define S5PCSIS_DPHYCTRL 0x04
56 #define S5PCSIS_DPHYCTRL_HSS_MASK (0x1f << 27)
57 #define S5PCSIS_DPHYCTRL_ENABLE (0x1f << 0)
58
59 #define S5PCSIS_CONFIG 0x08
60 #define S5PCSIS_CFG_FMT_YCBCR422_8BIT (0x1e << 2)
61 #define S5PCSIS_CFG_FMT_RAW8 (0x2a << 2)
62 #define S5PCSIS_CFG_FMT_RAW10 (0x2b << 2)
63 #define S5PCSIS_CFG_FMT_RAW12 (0x2c << 2)
64 /* User defined formats, x = 1...4 */
65 #define S5PCSIS_CFG_FMT_USER(x) ((0x30 + x - 1) << 2)
66 #define S5PCSIS_CFG_FMT_MASK (0x3f << 2)
67 #define S5PCSIS_CFG_NR_LANE_MASK 3
68
69 /* Interrupt mask */
70 #define S5PCSIS_INTMSK 0x10
71 #define S5PCSIS_INTMSK_EVEN_BEFORE (1 << 31)
72 #define S5PCSIS_INTMSK_EVEN_AFTER (1 << 30)
73 #define S5PCSIS_INTMSK_ODD_BEFORE (1 << 29)
74 #define S5PCSIS_INTMSK_ODD_AFTER (1 << 28)
75 #define S5PCSIS_INTMSK_FRAME_START (1 << 27)
76 #define S5PCSIS_INTMSK_FRAME_END (1 << 26)
77 #define S5PCSIS_INTMSK_ERR_SOT_HS (1 << 12)
78 #define S5PCSIS_INTMSK_ERR_LOST_FS (1 << 5)
79 #define S5PCSIS_INTMSK_ERR_LOST_FE (1 << 4)
80 #define S5PCSIS_INTMSK_ERR_OVER (1 << 3)
81 #define S5PCSIS_INTMSK_ERR_ECC (1 << 2)
82 #define S5PCSIS_INTMSK_ERR_CRC (1 << 1)
83 #define S5PCSIS_INTMSK_ERR_UNKNOWN (1 << 0)
84 #define S5PCSIS_INTMSK_EXYNOS4_EN_ALL 0xf000103f
85 #define S5PCSIS_INTMSK_EXYNOS5_EN_ALL 0xfc00103f
86
87 /* Interrupt source */
88 #define S5PCSIS_INTSRC 0x14
89 #define S5PCSIS_INTSRC_EVEN_BEFORE (1 << 31)
90 #define S5PCSIS_INTSRC_EVEN_AFTER (1 << 30)
91 #define S5PCSIS_INTSRC_EVEN (0x3 << 30)
92 #define S5PCSIS_INTSRC_ODD_BEFORE (1 << 29)
93 #define S5PCSIS_INTSRC_ODD_AFTER (1 << 28)
94 #define S5PCSIS_INTSRC_ODD (0x3 << 28)
95 #define S5PCSIS_INTSRC_NON_IMAGE_DATA (0xf << 28)
96 #define S5PCSIS_INTSRC_FRAME_START (1 << 27)
97 #define S5PCSIS_INTSRC_FRAME_END (1 << 26)
98 #define S5PCSIS_INTSRC_ERR_SOT_HS (0xf << 12)
99 #define S5PCSIS_INTSRC_ERR_LOST_FS (1 << 5)
100 #define S5PCSIS_INTSRC_ERR_LOST_FE (1 << 4)
101 #define S5PCSIS_INTSRC_ERR_OVER (1 << 3)
102 #define S5PCSIS_INTSRC_ERR_ECC (1 << 2)
103 #define S5PCSIS_INTSRC_ERR_CRC (1 << 1)
104 #define S5PCSIS_INTSRC_ERR_UNKNOWN (1 << 0)
105 #define S5PCSIS_INTSRC_ERRORS 0xf03f
106
107 /* Pixel resolution */
108 #define S5PCSIS_RESOL 0x2c
109 #define CSIS_MAX_PIX_WIDTH 0xffff
110 #define CSIS_MAX_PIX_HEIGHT 0xffff
111
112 /* Non-image packet data buffers */
113 #define S5PCSIS_PKTDATA_ODD 0x2000
114 #define S5PCSIS_PKTDATA_EVEN 0x3000
115 #define S5PCSIS_PKTDATA_SIZE SZ_4K
116
117 enum {
118 CSIS_CLK_MUX,
119 CSIS_CLK_GATE,
120 };
121
122 static char *csi_clock_name[] = {
123 [CSIS_CLK_MUX] = "sclk_csis",
124 [CSIS_CLK_GATE] = "csis",
125 };
126 #define NUM_CSIS_CLOCKS ARRAY_SIZE(csi_clock_name)
127 #define DEFAULT_SCLK_CSIS_FREQ 166000000UL
128
129 static const char * const csis_supply_name[] = {
130 "vddcore", /* CSIS Core (1.0V, 1.1V or 1.2V) suppply */
131 "vddio", /* CSIS I/O and PLL (1.8V) supply */
132 };
133 #define CSIS_NUM_SUPPLIES ARRAY_SIZE(csis_supply_name)
134
135 enum {
136 ST_POWERED = 1,
137 ST_STREAMING = 2,
138 ST_SUSPENDED = 4,
139 };
140
141 struct s5pcsis_event {
142 u32 mask;
143 const char * const name;
144 unsigned int counter;
145 };
146
147 static const struct s5pcsis_event s5pcsis_events[] = {
148 /* Errors */
149 { S5PCSIS_INTSRC_ERR_SOT_HS, "SOT Error" },
150 { S5PCSIS_INTSRC_ERR_LOST_FS, "Lost Frame Start Error" },
151 { S5PCSIS_INTSRC_ERR_LOST_FE, "Lost Frame End Error" },
152 { S5PCSIS_INTSRC_ERR_OVER, "FIFO Overflow Error" },
153 { S5PCSIS_INTSRC_ERR_ECC, "ECC Error" },
154 { S5PCSIS_INTSRC_ERR_CRC, "CRC Error" },
155 { S5PCSIS_INTSRC_ERR_UNKNOWN, "Unknown Error" },
156 /* Non-image data receive events */
157 { S5PCSIS_INTSRC_EVEN_BEFORE, "Non-image data before even frame" },
158 { S5PCSIS_INTSRC_EVEN_AFTER, "Non-image data after even frame" },
159 { S5PCSIS_INTSRC_ODD_BEFORE, "Non-image data before odd frame" },
160 { S5PCSIS_INTSRC_ODD_AFTER, "Non-image data after odd frame" },
161 /* Frame start/end */
162 { S5PCSIS_INTSRC_FRAME_START, "Frame Start" },
163 { S5PCSIS_INTSRC_FRAME_END, "Frame End" },
164 };
165 #define S5PCSIS_NUM_EVENTS ARRAY_SIZE(s5pcsis_events)
166
167 struct csis_pktbuf {
168 u32 *data;
169 unsigned int len;
170 };
171
172 struct csis_drvdata {
173 /* Mask of all used interrupts in S5PCSIS_INTMSK register */
174 u32 interrupt_mask;
175 };
176
177 /**
178 * struct csis_state - the driver's internal state data structure
179 * @lock: mutex serializing the subdev and power management operations,
180 * protecting @format and @flags members
181 * @pads: CSIS pads array
182 * @sd: v4l2_subdev associated with CSIS device instance
183 * @index: the hardware instance index
184 * @pdev: CSIS platform device
185 * @phy: pointer to the CSIS generic PHY
186 * @regs: mmaped I/O registers memory
187 * @supplies: CSIS regulator supplies
188 * @clock: CSIS clocks
189 * @irq: requested s5p-mipi-csis irq number
190 * @interrupt_mask: interrupt mask of the all used interrupts
191 * @flags: the state variable for power and streaming control
192 * @clk_frequency: device bus clock frequency
193 * @hs_settle: HS-RX settle time
194 * @num_lanes: number of MIPI-CSI data lanes used
195 * @max_num_lanes: maximum number of MIPI-CSI data lanes supported
196 * @wclk_ext: CSI wrapper clock: 0 - bus clock, 1 - external SCLK_CAM
197 * @csis_fmt: current CSIS pixel format
198 * @format: common media bus format for the source and sink pad
199 * @slock: spinlock protecting structure members below
200 * @pkt_buf: the frame embedded (non-image) data buffer
201 * @events: MIPI-CSIS event (error) counters
202 */
203 struct csis_state {
204 struct mutex lock;
205 struct media_pad pads[CSIS_PADS_NUM];
206 struct v4l2_subdev sd;
207 u8 index;
208 struct platform_device *pdev;
209 struct phy *phy;
210 void __iomem *regs;
211 struct regulator_bulk_data supplies[CSIS_NUM_SUPPLIES];
212 struct clk *clock[NUM_CSIS_CLOCKS];
213 int irq;
214 u32 interrupt_mask;
215 u32 flags;
216
217 u32 clk_frequency;
218 u32 hs_settle;
219 u32 num_lanes;
220 u32 max_num_lanes;
221 u8 wclk_ext;
222
223 const struct csis_pix_format *csis_fmt;
224 struct v4l2_mbus_framefmt format;
225
226 spinlock_t slock;
227 struct csis_pktbuf pkt_buf;
228 struct s5pcsis_event events[S5PCSIS_NUM_EVENTS];
229 };
230
231 /**
232 * struct csis_pix_format - CSIS pixel format description
233 * @pix_width_alignment: horizontal pixel alignment, width will be
234 * multiple of 2^pix_width_alignment
235 * @code: corresponding media bus code
236 * @fmt_reg: S5PCSIS_CONFIG register value
237 * @data_alignment: MIPI-CSI data alignment in bits
238 */
239 struct csis_pix_format {
240 unsigned int pix_width_alignment;
241 u32 code;
242 u32 fmt_reg;
243 u8 data_alignment;
244 };
245
246 static const struct csis_pix_format s5pcsis_formats[] = {
247 {
248 .code = MEDIA_BUS_FMT_VYUY8_2X8,
249 .fmt_reg = S5PCSIS_CFG_FMT_YCBCR422_8BIT,
250 .data_alignment = 32,
251 }, {
252 .code = MEDIA_BUS_FMT_JPEG_1X8,
253 .fmt_reg = S5PCSIS_CFG_FMT_USER(1),
254 .data_alignment = 32,
255 }, {
256 .code = MEDIA_BUS_FMT_S5C_UYVY_JPEG_1X8,
257 .fmt_reg = S5PCSIS_CFG_FMT_USER(1),
258 .data_alignment = 32,
259 }, {
260 .code = MEDIA_BUS_FMT_SGRBG8_1X8,
261 .fmt_reg = S5PCSIS_CFG_FMT_RAW8,
262 .data_alignment = 24,
263 }, {
264 .code = MEDIA_BUS_FMT_SGRBG10_1X10,
265 .fmt_reg = S5PCSIS_CFG_FMT_RAW10,
266 .data_alignment = 24,
267 }, {
268 .code = MEDIA_BUS_FMT_SGRBG12_1X12,
269 .fmt_reg = S5PCSIS_CFG_FMT_RAW12,
270 .data_alignment = 24,
271 }
272 };
273
274 #define s5pcsis_write(__csis, __r, __v) writel(__v, __csis->regs + __r)
275 #define s5pcsis_read(__csis, __r) readl(__csis->regs + __r)
276
277 static struct csis_state *sd_to_csis_state(struct v4l2_subdev *sdev)
278 {
279 return container_of(sdev, struct csis_state, sd);
280 }
281
282 static const struct csis_pix_format *find_csis_format(
283 struct v4l2_mbus_framefmt *mf)
284 {
285 int i;
286
287 for (i = 0; i < ARRAY_SIZE(s5pcsis_formats); i++)
288 if (mf->code == s5pcsis_formats[i].code)
289 return &s5pcsis_formats[i];
290 return NULL;
291 }
292
293 static void s5pcsis_enable_interrupts(struct csis_state *state, bool on)
294 {
295 u32 val = s5pcsis_read(state, S5PCSIS_INTMSK);
296 if (on)
297 val |= state->interrupt_mask;
298 else
299 val &= ~state->interrupt_mask;
300 s5pcsis_write(state, S5PCSIS_INTMSK, val);
301 }
302
303 static void s5pcsis_reset(struct csis_state *state)
304 {
305 u32 val = s5pcsis_read(state, S5PCSIS_CTRL);
306
307 s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_RESET);
308 udelay(10);
309 }
310
311 static void s5pcsis_system_enable(struct csis_state *state, int on)
312 {
313 u32 val, mask;
314
315 val = s5pcsis_read(state, S5PCSIS_CTRL);
316 if (on)
317 val |= S5PCSIS_CTRL_ENABLE;
318 else
319 val &= ~S5PCSIS_CTRL_ENABLE;
320 s5pcsis_write(state, S5PCSIS_CTRL, val);
321
322 val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
323 val &= ~S5PCSIS_DPHYCTRL_ENABLE;
324 if (on) {
325 mask = (1 << (state->num_lanes + 1)) - 1;
326 val |= (mask & S5PCSIS_DPHYCTRL_ENABLE);
327 }
328 s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
329 }
330
331 /* Called with the state.lock mutex held */
332 static void __s5pcsis_set_format(struct csis_state *state)
333 {
334 struct v4l2_mbus_framefmt *mf = &state->format;
335 u32 val;
336
337 v4l2_dbg(1, debug, &state->sd, "fmt: %#x, %d x %d\n",
338 mf->code, mf->width, mf->height);
339
340 /* Color format */
341 val = s5pcsis_read(state, S5PCSIS_CONFIG);
342 val = (val & ~S5PCSIS_CFG_FMT_MASK) | state->csis_fmt->fmt_reg;
343 s5pcsis_write(state, S5PCSIS_CONFIG, val);
344
345 /* Pixel resolution */
346 val = (mf->width << 16) | mf->height;
347 s5pcsis_write(state, S5PCSIS_RESOL, val);
348 }
349
350 static void s5pcsis_set_hsync_settle(struct csis_state *state, int settle)
351 {
352 u32 val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
353
354 val = (val & ~S5PCSIS_DPHYCTRL_HSS_MASK) | (settle << 27);
355 s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
356 }
357
358 static void s5pcsis_set_params(struct csis_state *state)
359 {
360 u32 val;
361
362 val = s5pcsis_read(state, S5PCSIS_CONFIG);
363 val = (val & ~S5PCSIS_CFG_NR_LANE_MASK) | (state->num_lanes - 1);
364 s5pcsis_write(state, S5PCSIS_CONFIG, val);
365
366 __s5pcsis_set_format(state);
367 s5pcsis_set_hsync_settle(state, state->hs_settle);
368
369 val = s5pcsis_read(state, S5PCSIS_CTRL);
370 if (state->csis_fmt->data_alignment == 32)
371 val |= S5PCSIS_CTRL_ALIGN_32BIT;
372 else /* 24-bits */
373 val &= ~S5PCSIS_CTRL_ALIGN_32BIT;
374
375 val &= ~S5PCSIS_CTRL_WCLK_EXTCLK;
376 if (state->wclk_ext)
377 val |= S5PCSIS_CTRL_WCLK_EXTCLK;
378 s5pcsis_write(state, S5PCSIS_CTRL, val);
379
380 /* Update the shadow register. */
381 val = s5pcsis_read(state, S5PCSIS_CTRL);
382 s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_UPDATE_SHADOW);
383 }
384
385 static void s5pcsis_clk_put(struct csis_state *state)
386 {
387 int i;
388
389 for (i = 0; i < NUM_CSIS_CLOCKS; i++) {
390 if (IS_ERR(state->clock[i]))
391 continue;
392 clk_unprepare(state->clock[i]);
393 clk_put(state->clock[i]);
394 state->clock[i] = ERR_PTR(-EINVAL);
395 }
396 }
397
398 static int s5pcsis_clk_get(struct csis_state *state)
399 {
400 struct device *dev = &state->pdev->dev;
401 int i, ret;
402
403 for (i = 0; i < NUM_CSIS_CLOCKS; i++)
404 state->clock[i] = ERR_PTR(-EINVAL);
405
406 for (i = 0; i < NUM_CSIS_CLOCKS; i++) {
407 state->clock[i] = clk_get(dev, csi_clock_name[i]);
408 if (IS_ERR(state->clock[i])) {
409 ret = PTR_ERR(state->clock[i]);
410 goto err;
411 }
412 ret = clk_prepare(state->clock[i]);
413 if (ret < 0) {
414 clk_put(state->clock[i]);
415 state->clock[i] = ERR_PTR(-EINVAL);
416 goto err;
417 }
418 }
419 return 0;
420 err:
421 s5pcsis_clk_put(state);
422 dev_err(dev, "failed to get clock: %s\n", csi_clock_name[i]);
423 return ret;
424 }
425
426 static void dump_regs(struct csis_state *state, const char *label)
427 {
428 struct {
429 u32 offset;
430 const char * const name;
431 } registers[] = {
432 { 0x00, "CTRL" },
433 { 0x04, "DPHYCTRL" },
434 { 0x08, "CONFIG" },
435 { 0x0c, "DPHYSTS" },
436 { 0x10, "INTMSK" },
437 { 0x2c, "RESOL" },
438 { 0x38, "SDW_CONFIG" },
439 };
440 u32 i;
441
442 v4l2_info(&state->sd, "--- %s ---\n", label);
443
444 for (i = 0; i < ARRAY_SIZE(registers); i++) {
445 u32 cfg = s5pcsis_read(state, registers[i].offset);
446 v4l2_info(&state->sd, "%10s: 0x%08x\n", registers[i].name, cfg);
447 }
448 }
449
450 static void s5pcsis_start_stream(struct csis_state *state)
451 {
452 s5pcsis_reset(state);
453 s5pcsis_set_params(state);
454 s5pcsis_system_enable(state, true);
455 s5pcsis_enable_interrupts(state, true);
456 }
457
458 static void s5pcsis_stop_stream(struct csis_state *state)
459 {
460 s5pcsis_enable_interrupts(state, false);
461 s5pcsis_system_enable(state, false);
462 }
463
464 static void s5pcsis_clear_counters(struct csis_state *state)
465 {
466 unsigned long flags;
467 int i;
468
469 spin_lock_irqsave(&state->slock, flags);
470 for (i = 0; i < S5PCSIS_NUM_EVENTS; i++)
471 state->events[i].counter = 0;
472 spin_unlock_irqrestore(&state->slock, flags);
473 }
474
475 static void s5pcsis_log_counters(struct csis_state *state, bool non_errors)
476 {
477 int i = non_errors ? S5PCSIS_NUM_EVENTS : S5PCSIS_NUM_EVENTS - 4;
478 unsigned long flags;
479
480 spin_lock_irqsave(&state->slock, flags);
481
482 for (i--; i >= 0; i--) {
483 if (state->events[i].counter > 0 || debug)
484 v4l2_info(&state->sd, "%s events: %d\n",
485 state->events[i].name,
486 state->events[i].counter);
487 }
488 spin_unlock_irqrestore(&state->slock, flags);
489 }
490
491 /*
492 * V4L2 subdev operations
493 */
494 static int s5pcsis_s_power(struct v4l2_subdev *sd, int on)
495 {
496 struct csis_state *state = sd_to_csis_state(sd);
497 struct device *dev = &state->pdev->dev;
498
499 if (on)
500 return pm_runtime_get_sync(dev);
501
502 return pm_runtime_put_sync(dev);
503 }
504
505 static int s5pcsis_s_stream(struct v4l2_subdev *sd, int enable)
506 {
507 struct csis_state *state = sd_to_csis_state(sd);
508 int ret = 0;
509
510 v4l2_dbg(1, debug, sd, "%s: %d, state: 0x%x\n",
511 __func__, enable, state->flags);
512
513 if (enable) {
514 s5pcsis_clear_counters(state);
515 ret = pm_runtime_get_sync(&state->pdev->dev);
516 if (ret && ret != 1)
517 return ret;
518 }
519
520 mutex_lock(&state->lock);
521 if (enable) {
522 if (state->flags & ST_SUSPENDED) {
523 ret = -EBUSY;
524 goto unlock;
525 }
526 s5pcsis_start_stream(state);
527 state->flags |= ST_STREAMING;
528 } else {
529 s5pcsis_stop_stream(state);
530 state->flags &= ~ST_STREAMING;
531 if (debug > 0)
532 s5pcsis_log_counters(state, true);
533 }
534 unlock:
535 mutex_unlock(&state->lock);
536 if (!enable)
537 pm_runtime_put(&state->pdev->dev);
538
539 return ret == 1 ? 0 : ret;
540 }
541
542 static int s5pcsis_enum_mbus_code(struct v4l2_subdev *sd,
543 struct v4l2_subdev_pad_config *cfg,
544 struct v4l2_subdev_mbus_code_enum *code)
545 {
546 if (code->index >= ARRAY_SIZE(s5pcsis_formats))
547 return -EINVAL;
548
549 code->code = s5pcsis_formats[code->index].code;
550 return 0;
551 }
552
553 static struct csis_pix_format const *s5pcsis_try_format(
554 struct v4l2_mbus_framefmt *mf)
555 {
556 struct csis_pix_format const *csis_fmt;
557
558 csis_fmt = find_csis_format(mf);
559 if (csis_fmt == NULL)
560 csis_fmt = &s5pcsis_formats[0];
561
562 mf->code = csis_fmt->code;
563 v4l_bound_align_image(&mf->width, 1, CSIS_MAX_PIX_WIDTH,
564 csis_fmt->pix_width_alignment,
565 &mf->height, 1, CSIS_MAX_PIX_HEIGHT, 1,
566 0);
567 return csis_fmt;
568 }
569
570 static struct v4l2_mbus_framefmt *__s5pcsis_get_format(
571 struct csis_state *state, struct v4l2_subdev_pad_config *cfg,
572 enum v4l2_subdev_format_whence which)
573 {
574 if (which == V4L2_SUBDEV_FORMAT_TRY)
575 return cfg ? v4l2_subdev_get_try_format(&state->sd, cfg, 0) : NULL;
576
577 return &state->format;
578 }
579
580 static int s5pcsis_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
581 struct v4l2_subdev_format *fmt)
582 {
583 struct csis_state *state = sd_to_csis_state(sd);
584 struct csis_pix_format const *csis_fmt;
585 struct v4l2_mbus_framefmt *mf;
586
587 mf = __s5pcsis_get_format(state, cfg, fmt->which);
588
589 if (fmt->pad == CSIS_PAD_SOURCE) {
590 if (mf) {
591 mutex_lock(&state->lock);
592 fmt->format = *mf;
593 mutex_unlock(&state->lock);
594 }
595 return 0;
596 }
597 csis_fmt = s5pcsis_try_format(&fmt->format);
598 if (mf) {
599 mutex_lock(&state->lock);
600 *mf = fmt->format;
601 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
602 state->csis_fmt = csis_fmt;
603 mutex_unlock(&state->lock);
604 }
605 return 0;
606 }
607
608 static int s5pcsis_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
609 struct v4l2_subdev_format *fmt)
610 {
611 struct csis_state *state = sd_to_csis_state(sd);
612 struct v4l2_mbus_framefmt *mf;
613
614 mf = __s5pcsis_get_format(state, cfg, fmt->which);
615 if (!mf)
616 return -EINVAL;
617
618 mutex_lock(&state->lock);
619 fmt->format = *mf;
620 mutex_unlock(&state->lock);
621 return 0;
622 }
623
624 static int s5pcsis_s_rx_buffer(struct v4l2_subdev *sd, void *buf,
625 unsigned int *size)
626 {
627 struct csis_state *state = sd_to_csis_state(sd);
628 unsigned long flags;
629
630 *size = min_t(unsigned int, *size, S5PCSIS_PKTDATA_SIZE);
631
632 spin_lock_irqsave(&state->slock, flags);
633 state->pkt_buf.data = buf;
634 state->pkt_buf.len = *size;
635 spin_unlock_irqrestore(&state->slock, flags);
636
637 return 0;
638 }
639
640 static int s5pcsis_log_status(struct v4l2_subdev *sd)
641 {
642 struct csis_state *state = sd_to_csis_state(sd);
643
644 mutex_lock(&state->lock);
645 s5pcsis_log_counters(state, true);
646 if (debug && (state->flags & ST_POWERED))
647 dump_regs(state, __func__);
648 mutex_unlock(&state->lock);
649 return 0;
650 }
651
652 static const struct v4l2_subdev_core_ops s5pcsis_core_ops = {
653 .s_power = s5pcsis_s_power,
654 .log_status = s5pcsis_log_status,
655 };
656
657 static const struct v4l2_subdev_pad_ops s5pcsis_pad_ops = {
658 .enum_mbus_code = s5pcsis_enum_mbus_code,
659 .get_fmt = s5pcsis_get_fmt,
660 .set_fmt = s5pcsis_set_fmt,
661 };
662
663 static const struct v4l2_subdev_video_ops s5pcsis_video_ops = {
664 .s_rx_buffer = s5pcsis_s_rx_buffer,
665 .s_stream = s5pcsis_s_stream,
666 };
667
668 static const struct v4l2_subdev_ops s5pcsis_subdev_ops = {
669 .core = &s5pcsis_core_ops,
670 .pad = &s5pcsis_pad_ops,
671 .video = &s5pcsis_video_ops,
672 };
673
674 static irqreturn_t s5pcsis_irq_handler(int irq, void *dev_id)
675 {
676 struct csis_state *state = dev_id;
677 struct csis_pktbuf *pktbuf = &state->pkt_buf;
678 unsigned long flags;
679 u32 status;
680
681 status = s5pcsis_read(state, S5PCSIS_INTSRC);
682 spin_lock_irqsave(&state->slock, flags);
683
684 if ((status & S5PCSIS_INTSRC_NON_IMAGE_DATA) && pktbuf->data) {
685 u32 offset;
686
687 if (status & S5PCSIS_INTSRC_EVEN)
688 offset = S5PCSIS_PKTDATA_EVEN;
689 else
690 offset = S5PCSIS_PKTDATA_ODD;
691
692 memcpy(pktbuf->data, (u8 __force *)state->regs + offset,
693 pktbuf->len);
694 pktbuf->data = NULL;
695 rmb();
696 }
697
698 /* Update the event/error counters */
699 if ((status & S5PCSIS_INTSRC_ERRORS) || debug) {
700 int i;
701 for (i = 0; i < S5PCSIS_NUM_EVENTS; i++) {
702 if (!(status & state->events[i].mask))
703 continue;
704 state->events[i].counter++;
705 v4l2_dbg(2, debug, &state->sd, "%s: %d\n",
706 state->events[i].name,
707 state->events[i].counter);
708 }
709 v4l2_dbg(2, debug, &state->sd, "status: %08x\n", status);
710 }
711 spin_unlock_irqrestore(&state->slock, flags);
712
713 s5pcsis_write(state, S5PCSIS_INTSRC, status);
714 return IRQ_HANDLED;
715 }
716
717 static int s5pcsis_parse_dt(struct platform_device *pdev,
718 struct csis_state *state)
719 {
720 struct device_node *node = pdev->dev.of_node;
721 struct v4l2_fwnode_endpoint endpoint;
722 int ret;
723
724 if (of_property_read_u32(node, "clock-frequency",
725 &state->clk_frequency))
726 state->clk_frequency = DEFAULT_SCLK_CSIS_FREQ;
727 if (of_property_read_u32(node, "bus-width",
728 &state->max_num_lanes))
729 return -EINVAL;
730
731 node = of_graph_get_next_endpoint(node, NULL);
732 if (!node) {
733 dev_err(&pdev->dev, "No port node at %pOF\n",
734 pdev->dev.of_node);
735 return -EINVAL;
736 }
737 /* Get port node and validate MIPI-CSI channel id. */
738 ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(node), &endpoint);
739 if (ret)
740 goto err;
741
742 state->index = endpoint.base.port - FIMC_INPUT_MIPI_CSI2_0;
743 if (state->index >= CSIS_MAX_ENTITIES) {
744 ret = -ENXIO;
745 goto err;
746 }
747
748 /* Get MIPI CSI-2 bus configration from the endpoint node. */
749 of_property_read_u32(node, "samsung,csis-hs-settle",
750 &state->hs_settle);
751 state->wclk_ext = of_property_read_bool(node,
752 "samsung,csis-wclk");
753
754 state->num_lanes = endpoint.bus.mipi_csi2.num_data_lanes;
755
756 err:
757 of_node_put(node);
758 return ret;
759 }
760
761 static int s5pcsis_pm_resume(struct device *dev, bool runtime);
762 static const struct of_device_id s5pcsis_of_match[];
763
764 static int s5pcsis_probe(struct platform_device *pdev)
765 {
766 const struct of_device_id *of_id;
767 const struct csis_drvdata *drv_data;
768 struct device *dev = &pdev->dev;
769 struct resource *mem_res;
770 struct csis_state *state;
771 int ret = -ENOMEM;
772 int i;
773
774 state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
775 if (!state)
776 return -ENOMEM;
777
778 mutex_init(&state->lock);
779 spin_lock_init(&state->slock);
780 state->pdev = pdev;
781
782 of_id = of_match_node(s5pcsis_of_match, dev->of_node);
783 if (WARN_ON(of_id == NULL))
784 return -EINVAL;
785
786 drv_data = of_id->data;
787 state->interrupt_mask = drv_data->interrupt_mask;
788
789 ret = s5pcsis_parse_dt(pdev, state);
790 if (ret < 0)
791 return ret;
792
793 if (state->num_lanes == 0 || state->num_lanes > state->max_num_lanes) {
794 dev_err(dev, "Unsupported number of data lanes: %d (max. %d)\n",
795 state->num_lanes, state->max_num_lanes);
796 return -EINVAL;
797 }
798
799 state->phy = devm_phy_get(dev, "csis");
800 if (IS_ERR(state->phy))
801 return PTR_ERR(state->phy);
802
803 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
804 state->regs = devm_ioremap_resource(dev, mem_res);
805 if (IS_ERR(state->regs))
806 return PTR_ERR(state->regs);
807
808 state->irq = platform_get_irq(pdev, 0);
809 if (state->irq < 0) {
810 dev_err(dev, "Failed to get irq\n");
811 return state->irq;
812 }
813
814 for (i = 0; i < CSIS_NUM_SUPPLIES; i++)
815 state->supplies[i].supply = csis_supply_name[i];
816
817 ret = devm_regulator_bulk_get(dev, CSIS_NUM_SUPPLIES,
818 state->supplies);
819 if (ret)
820 return ret;
821
822 ret = s5pcsis_clk_get(state);
823 if (ret < 0)
824 return ret;
825
826 if (state->clk_frequency)
827 ret = clk_set_rate(state->clock[CSIS_CLK_MUX],
828 state->clk_frequency);
829 else
830 dev_WARN(dev, "No clock frequency specified!\n");
831 if (ret < 0)
832 goto e_clkput;
833
834 ret = clk_enable(state->clock[CSIS_CLK_MUX]);
835 if (ret < 0)
836 goto e_clkput;
837
838 ret = devm_request_irq(dev, state->irq, s5pcsis_irq_handler,
839 0, dev_name(dev), state);
840 if (ret) {
841 dev_err(dev, "Interrupt request failed\n");
842 goto e_clkdis;
843 }
844
845 v4l2_subdev_init(&state->sd, &s5pcsis_subdev_ops);
846 state->sd.owner = THIS_MODULE;
847 snprintf(state->sd.name, sizeof(state->sd.name), "%s.%d",
848 CSIS_SUBDEV_NAME, state->index);
849 state->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
850 state->csis_fmt = &s5pcsis_formats[0];
851
852 state->format.code = s5pcsis_formats[0].code;
853 state->format.width = S5PCSIS_DEF_PIX_WIDTH;
854 state->format.height = S5PCSIS_DEF_PIX_HEIGHT;
855
856 state->sd.entity.function = MEDIA_ENT_F_IO_V4L;
857 state->pads[CSIS_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
858 state->pads[CSIS_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
859 ret = media_entity_pads_init(&state->sd.entity,
860 CSIS_PADS_NUM, state->pads);
861 if (ret < 0)
862 goto e_clkdis;
863
864 /* This allows to retrieve the platform device id by the host driver */
865 v4l2_set_subdevdata(&state->sd, pdev);
866
867 /* .. and a pointer to the subdev. */
868 platform_set_drvdata(pdev, &state->sd);
869 memcpy(state->events, s5pcsis_events, sizeof(state->events));
870
871 pm_runtime_enable(dev);
872 if (!pm_runtime_enabled(dev)) {
873 ret = s5pcsis_pm_resume(dev, true);
874 if (ret < 0)
875 goto e_m_ent;
876 }
877
878 dev_info(&pdev->dev, "lanes: %d, hs_settle: %d, wclk: %d, freq: %u\n",
879 state->num_lanes, state->hs_settle, state->wclk_ext,
880 state->clk_frequency);
881 return 0;
882
883 e_m_ent:
884 media_entity_cleanup(&state->sd.entity);
885 e_clkdis:
886 clk_disable(state->clock[CSIS_CLK_MUX]);
887 e_clkput:
888 s5pcsis_clk_put(state);
889 return ret;
890 }
891
892 static int s5pcsis_pm_suspend(struct device *dev, bool runtime)
893 {
894 struct platform_device *pdev = to_platform_device(dev);
895 struct v4l2_subdev *sd = platform_get_drvdata(pdev);
896 struct csis_state *state = sd_to_csis_state(sd);
897 int ret = 0;
898
899 v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
900 __func__, state->flags);
901
902 mutex_lock(&state->lock);
903 if (state->flags & ST_POWERED) {
904 s5pcsis_stop_stream(state);
905 ret = phy_power_off(state->phy);
906 if (ret)
907 goto unlock;
908 ret = regulator_bulk_disable(CSIS_NUM_SUPPLIES,
909 state->supplies);
910 if (ret)
911 goto unlock;
912 clk_disable(state->clock[CSIS_CLK_GATE]);
913 state->flags &= ~ST_POWERED;
914 if (!runtime)
915 state->flags |= ST_SUSPENDED;
916 }
917 unlock:
918 mutex_unlock(&state->lock);
919 return ret ? -EAGAIN : 0;
920 }
921
922 static int s5pcsis_pm_resume(struct device *dev, bool runtime)
923 {
924 struct platform_device *pdev = to_platform_device(dev);
925 struct v4l2_subdev *sd = platform_get_drvdata(pdev);
926 struct csis_state *state = sd_to_csis_state(sd);
927 int ret = 0;
928
929 v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
930 __func__, state->flags);
931
932 mutex_lock(&state->lock);
933 if (!runtime && !(state->flags & ST_SUSPENDED))
934 goto unlock;
935
936 if (!(state->flags & ST_POWERED)) {
937 ret = regulator_bulk_enable(CSIS_NUM_SUPPLIES,
938 state->supplies);
939 if (ret)
940 goto unlock;
941 ret = phy_power_on(state->phy);
942 if (!ret) {
943 state->flags |= ST_POWERED;
944 } else {
945 regulator_bulk_disable(CSIS_NUM_SUPPLIES,
946 state->supplies);
947 goto unlock;
948 }
949 clk_enable(state->clock[CSIS_CLK_GATE]);
950 }
951 if (state->flags & ST_STREAMING)
952 s5pcsis_start_stream(state);
953
954 state->flags &= ~ST_SUSPENDED;
955 unlock:
956 mutex_unlock(&state->lock);
957 return ret ? -EAGAIN : 0;
958 }
959
960 #ifdef CONFIG_PM_SLEEP
961 static int s5pcsis_suspend(struct device *dev)
962 {
963 return s5pcsis_pm_suspend(dev, false);
964 }
965
966 static int s5pcsis_resume(struct device *dev)
967 {
968 return s5pcsis_pm_resume(dev, false);
969 }
970 #endif
971
972 #ifdef CONFIG_PM
973 static int s5pcsis_runtime_suspend(struct device *dev)
974 {
975 return s5pcsis_pm_suspend(dev, true);
976 }
977
978 static int s5pcsis_runtime_resume(struct device *dev)
979 {
980 return s5pcsis_pm_resume(dev, true);
981 }
982 #endif
983
984 static int s5pcsis_remove(struct platform_device *pdev)
985 {
986 struct v4l2_subdev *sd = platform_get_drvdata(pdev);
987 struct csis_state *state = sd_to_csis_state(sd);
988
989 pm_runtime_disable(&pdev->dev);
990 s5pcsis_pm_suspend(&pdev->dev, true);
991 clk_disable(state->clock[CSIS_CLK_MUX]);
992 pm_runtime_set_suspended(&pdev->dev);
993 s5pcsis_clk_put(state);
994
995 media_entity_cleanup(&state->sd.entity);
996
997 return 0;
998 }
999
1000 static const struct dev_pm_ops s5pcsis_pm_ops = {
1001 SET_RUNTIME_PM_OPS(s5pcsis_runtime_suspend, s5pcsis_runtime_resume,
1002 NULL)
1003 SET_SYSTEM_SLEEP_PM_OPS(s5pcsis_suspend, s5pcsis_resume)
1004 };
1005
1006 static const struct csis_drvdata exynos4_csis_drvdata = {
1007 .interrupt_mask = S5PCSIS_INTMSK_EXYNOS4_EN_ALL,
1008 };
1009
1010 static const struct csis_drvdata exynos5_csis_drvdata = {
1011 .interrupt_mask = S5PCSIS_INTMSK_EXYNOS5_EN_ALL,
1012 };
1013
1014 static const struct of_device_id s5pcsis_of_match[] = {
1015 {
1016 .compatible = "samsung,s5pv210-csis",
1017 .data = &exynos4_csis_drvdata,
1018 }, {
1019 .compatible = "samsung,exynos4210-csis",
1020 .data = &exynos4_csis_drvdata,
1021 }, {
1022 .compatible = "samsung,exynos5250-csis",
1023 .data = &exynos5_csis_drvdata,
1024 },
1025 { /* sentinel */ },
1026 };
1027 MODULE_DEVICE_TABLE(of, s5pcsis_of_match);
1028
1029 static struct platform_driver s5pcsis_driver = {
1030 .probe = s5pcsis_probe,
1031 .remove = s5pcsis_remove,
1032 .driver = {
1033 .of_match_table = s5pcsis_of_match,
1034 .name = CSIS_DRIVER_NAME,
1035 .pm = &s5pcsis_pm_ops,
1036 },
1037 };
1038
1039 module_platform_driver(s5pcsis_driver);
1040
1041 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1042 MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC MIPI-CSI2 receiver driver");
1043 MODULE_LICENSE("GPL");
CRIS linux kernel tree