summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/exynos/exynos_drm_mic.c
blob: a0def0be6d650de02fad25fc3cf3248d89b8fce0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
/*
 * Copyright (C) 2015 Samsung Electronics Co.Ltd
 * Authors:
 *	Hyungwon Hwang <human.hwang@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundationr
 */

#include <linux/platform_device.h>
#include <video/of_videomode.h>
#include <linux/of_address.h>
#include <video/videomode.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/clk.h>
#include <linux/component.h>
#include <drm/drmP.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>

/* Sysreg registers for MIC */
#define DSD_CFG_MUX	0x1004
#define MIC0_RGB_MUX	(1 << 0)
#define MIC0_I80_MUX	(1 << 1)
#define MIC0_ON_MUX	(1 << 5)

/* MIC registers */
#define MIC_OP				0x0
#define MIC_IP_VER			0x0004
#define MIC_V_TIMING_0			0x0008
#define MIC_V_TIMING_1			0x000C
#define MIC_IMG_SIZE			0x0010
#define MIC_INPUT_TIMING_0		0x0014
#define MIC_INPUT_TIMING_1		0x0018
#define MIC_2D_OUTPUT_TIMING_0		0x001C
#define MIC_2D_OUTPUT_TIMING_1		0x0020
#define MIC_2D_OUTPUT_TIMING_2		0x0024
#define MIC_3D_OUTPUT_TIMING_0		0x0028
#define MIC_3D_OUTPUT_TIMING_1		0x002C
#define MIC_3D_OUTPUT_TIMING_2		0x0030
#define MIC_CORE_PARA_0			0x0034
#define MIC_CORE_PARA_1			0x0038
#define MIC_CTC_CTRL			0x0040
#define MIC_RD_DATA			0x0044

#define MIC_UPD_REG			(1 << 31)
#define MIC_ON_REG			(1 << 30)
#define MIC_TD_ON_REG			(1 << 29)
#define MIC_BS_CHG_OUT			(1 << 16)
#define MIC_VIDEO_TYPE(x)		(((x) & 0xf) << 12)
#define MIC_PSR_EN			(1 << 5)
#define MIC_SW_RST			(1 << 4)
#define MIC_ALL_RST			(1 << 3)
#define MIC_CORE_VER_CONTROL		(1 << 2)
#define MIC_MODE_SEL_COMMAND_MODE	(1 << 1)
#define MIC_MODE_SEL_MASK		(1 << 1)
#define MIC_CORE_EN			(1 << 0)

#define MIC_V_PULSE_WIDTH(x)		(((x) & 0x3fff) << 16)
#define MIC_V_PERIOD_LINE(x)		((x) & 0x3fff)

#define MIC_VBP_SIZE(x)			(((x) & 0x3fff) << 16)
#define MIC_VFP_SIZE(x)			((x) & 0x3fff)

#define MIC_IMG_V_SIZE(x)		(((x) & 0x3fff) << 16)
#define MIC_IMG_H_SIZE(x)		((x) & 0x3fff)

#define MIC_H_PULSE_WIDTH_IN(x)		(((x) & 0x3fff) << 16)
#define MIC_H_PERIOD_PIXEL_IN(x)	((x) & 0x3fff)

#define MIC_HBP_SIZE_IN(x)		(((x) & 0x3fff) << 16)
#define MIC_HFP_SIZE_IN(x)		((x) & 0x3fff)

#define MIC_H_PULSE_WIDTH_2D(x)		(((x) & 0x3fff) << 16)
#define MIC_H_PERIOD_PIXEL_2D(x)	((x) & 0x3fff)

#define MIC_HBP_SIZE_2D(x)		(((x) & 0x3fff) << 16)
#define MIC_HFP_SIZE_2D(x)		((x) & 0x3fff)

#define MIC_BS_SIZE_2D(x)	((x) & 0x3fff)

enum {
	ENDPOINT_DECON_NODE,
	ENDPOINT_DSI_NODE,
	NUM_ENDPOINTS
};

static char *clk_names[] = { "pclk_mic0", "sclk_rgb_vclk_to_mic0" };
#define NUM_CLKS		ARRAY_SIZE(clk_names)
static DEFINE_MUTEX(mic_mutex);

struct exynos_mic {
	struct device *dev;
	void __iomem *reg;
	struct regmap *sysreg;
	struct clk *clks[NUM_CLKS];

	bool i80_mode;
	struct videomode vm;
	struct drm_encoder *encoder;
	struct drm_bridge bridge;

	bool enabled;
};

static void mic_set_path(struct exynos_mic *mic, bool enable)
{
	int ret;
	unsigned int val;

	ret = regmap_read(mic->sysreg, DSD_CFG_MUX, &val);
	if (ret) {
		DRM_ERROR("mic: Failed to read system register\n");
		return;
	}

	if (enable) {
		if (mic->i80_mode)
			val |= MIC0_I80_MUX;
		else
			val |= MIC0_RGB_MUX;

		val |=  MIC0_ON_MUX;
	} else
		val &= ~(MIC0_RGB_MUX | MIC0_I80_MUX | MIC0_ON_MUX);

	ret = regmap_write(mic->sysreg, DSD_CFG_MUX, val);
	if (ret)
		DRM_ERROR("mic: Failed to read system register\n");
}

static int mic_sw_reset(struct exynos_mic *mic)
{
	unsigned int retry = 100;
	int ret;

	writel(MIC_SW_RST, mic->reg + MIC_OP);

	while (retry-- > 0) {
		ret = readl(mic->reg + MIC_OP);
		if (!(ret & MIC_SW_RST))
			return 0;

		udelay(10);
	}

	return -ETIMEDOUT;
}

static void mic_set_porch_timing(struct exynos_mic *mic)
{
	struct videomode vm = mic->vm;
	u32 reg;

	reg = MIC_V_PULSE_WIDTH(vm.vsync_len) +
		MIC_V_PERIOD_LINE(vm.vsync_len + vm.vactive +
				vm.vback_porch + vm.vfront_porch);
	writel(reg, mic->reg + MIC_V_TIMING_0);

	reg = MIC_VBP_SIZE(vm.vback_porch) +
		MIC_VFP_SIZE(vm.vfront_porch);
	writel(reg, mic->reg + MIC_V_TIMING_1);

	reg = MIC_V_PULSE_WIDTH(vm.hsync_len) +
		MIC_V_PERIOD_LINE(vm.hsync_len + vm.hactive +
				vm.hback_porch + vm.hfront_porch);
	writel(reg, mic->reg + MIC_INPUT_TIMING_0);

	reg = MIC_VBP_SIZE(vm.hback_porch) +
		MIC_VFP_SIZE(vm.hfront_porch);
	writel(reg, mic->reg + MIC_INPUT_TIMING_1);
}

static void mic_set_img_size(struct exynos_mic *mic)
{
	struct videomode *vm = &mic->vm;
	u32 reg;

	reg = MIC_IMG_H_SIZE(vm->hactive) +
		MIC_IMG_V_SIZE(vm->vactive);

	writel(reg, mic->reg + MIC_IMG_SIZE);
}

static void mic_set_output_timing(struct exynos_mic *mic)
{
	struct videomode vm = mic->vm;
	u32 reg, bs_size_2d;

	DRM_DEBUG("w: %u, h: %u\n", vm.hactive, vm.vactive);
	bs_size_2d = ((vm.hactive >> 2) << 1) + (vm.vactive % 4);
	reg = MIC_BS_SIZE_2D(bs_size_2d);
	writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_2);

	if (!mic->i80_mode) {
		reg = MIC_H_PULSE_WIDTH_2D(vm.hsync_len) +
			MIC_H_PERIOD_PIXEL_2D(vm.hsync_len + bs_size_2d +
					vm.hback_porch + vm.hfront_porch);
		writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_0);

		reg = MIC_HBP_SIZE_2D(vm.hback_porch) +
			MIC_H_PERIOD_PIXEL_2D(vm.hfront_porch);
		writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_1);
	}
}

static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
{
	u32 reg = readl(mic->reg + MIC_OP);

	if (enable) {
		reg &= ~(MIC_MODE_SEL_MASK | MIC_CORE_VER_CONTROL | MIC_PSR_EN);
		reg |= (MIC_CORE_EN | MIC_BS_CHG_OUT | MIC_ON_REG);

		reg  &= ~MIC_MODE_SEL_COMMAND_MODE;
		if (mic->i80_mode)
			reg |= MIC_MODE_SEL_COMMAND_MODE;
	} else {
		reg &= ~MIC_CORE_EN;
	}

	reg |= MIC_UPD_REG;
	writel(reg, mic->reg + MIC_OP);
}

static struct device_node *get_remote_node(struct device_node *from, int reg)
{
	struct device_node *endpoint = NULL, *remote_node = NULL;

	endpoint = of_graph_get_endpoint_by_regs(from, reg, -1);
	if (!endpoint) {
		DRM_ERROR("mic: Failed to find remote port from %s",
				from->full_name);
		goto exit;
	}

	remote_node = of_graph_get_remote_port_parent(endpoint);
	if (!remote_node) {
		DRM_ERROR("mic: Failed to find remote port parent from %s",
							from->full_name);
		goto exit;
	}

exit:
	of_node_put(endpoint);
	return remote_node;
}

static int parse_dt(struct exynos_mic *mic)
{
	int ret = 0, i, j;
	struct device_node *remote_node;
	struct device_node *nodes[3];

	/*
	 * The order of endpoints does matter.
	 * The first node must be for decon and the second one must be for dsi.
	 */
	for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) {
		remote_node = get_remote_node(mic->dev->of_node, i);
		if (!remote_node) {
			ret = -EPIPE;
			goto exit;
		}
		nodes[j++] = remote_node;

		switch (i) {
		case ENDPOINT_DECON_NODE:
			/* decon node */
			if (of_get_child_by_name(remote_node,
						"i80-if-timings"))
				mic->i80_mode = 1;

			break;
		case ENDPOINT_DSI_NODE:
			/* panel node */
			remote_node = get_remote_node(remote_node, 1);
			if (!remote_node) {
				ret = -EPIPE;
				goto exit;
			}
			nodes[j++] = remote_node;

			ret = of_get_videomode(remote_node,
							&mic->vm, 0);
			if (ret) {
				DRM_ERROR("mic: failed to get videomode");
				goto exit;
			}

			break;
		default:
			DRM_ERROR("mic: Unknown endpoint from MIC");
			break;
		}
	}

exit:
	while (--j > -1)
		of_node_put(nodes[j]);

	return ret;
}

static void mic_disable(struct drm_bridge *bridge) { }

static void mic_post_disable(struct drm_bridge *bridge)
{
	struct exynos_mic *mic = bridge->driver_private;
	int i;

	mutex_lock(&mic_mutex);
	if (!mic->enabled)
		goto already_disabled;

	mic_set_path(mic, 0);

	for (i = NUM_CLKS - 1; i > -1; i--)
		clk_disable_unprepare(mic->clks[i]);

	mic->enabled = 0;

already_disabled:
	mutex_unlock(&mic_mutex);
}

static void mic_pre_enable(struct drm_bridge *bridge)
{
	struct exynos_mic *mic = bridge->driver_private;
	int ret, i;

	mutex_lock(&mic_mutex);
	if (mic->enabled)
		goto already_enabled;

	for (i = 0; i < NUM_CLKS; i++) {
		ret = clk_prepare_enable(mic->clks[i]);
		if (ret < 0) {
			DRM_ERROR("Failed to enable clock (%s)\n",
							clk_names[i]);
			goto turn_off_clks;
		}
	}

	mic_set_path(mic, 1);

	ret = mic_sw_reset(mic);
	if (ret) {
		DRM_ERROR("Failed to reset\n");
		goto turn_off_clks;
	}

	if (!mic->i80_mode)
		mic_set_porch_timing(mic);
	mic_set_img_size(mic);
	mic_set_output_timing(mic);
	mic_set_reg_on(mic, 1);
	mic->enabled = 1;
	mutex_unlock(&mic_mutex);

	return;

turn_off_clks:
	while (--i > -1)
		clk_disable_unprepare(mic->clks[i]);
already_enabled:
	mutex_unlock(&mic_mutex);
}

static void mic_enable(struct drm_bridge *bridge) { }

static const struct drm_bridge_funcs mic_bridge_funcs = {
	.disable = mic_disable,
	.post_disable = mic_post_disable,
	.pre_enable = mic_pre_enable,
	.enable = mic_enable,
};

static int exynos_mic_bind(struct device *dev, struct device *master,
			   void *data)
{
	struct exynos_mic *mic = dev_get_drvdata(dev);
	int ret;

	mic->bridge.funcs = &mic_bridge_funcs;
	mic->bridge.of_node = dev->of_node;
	mic->bridge.driver_private = mic;
	ret = drm_bridge_add(&mic->bridge);
	if (ret)
		DRM_ERROR("mic: Failed to add MIC to the global bridge list\n");

	return ret;
}

static void exynos_mic_unbind(struct device *dev, struct device *master,
			      void *data)
{
	struct exynos_mic *mic = dev_get_drvdata(dev);
	int i;

	mutex_lock(&mic_mutex);
	if (!mic->enabled)
		goto already_disabled;

	for (i = NUM_CLKS - 1; i > -1; i--)
		clk_disable_unprepare(mic->clks[i]);

already_disabled:
	mutex_unlock(&mic_mutex);

	drm_bridge_remove(&mic->bridge);
}

static const struct component_ops exynos_mic_component_ops = {
	.bind	= exynos_mic_bind,
	.unbind	= exynos_mic_unbind,
};

static int exynos_mic_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct exynos_mic *mic;
	struct resource res;
	int ret, i;

	mic = devm_kzalloc(dev, sizeof(*mic), GFP_KERNEL);
	if (!mic) {
		DRM_ERROR("mic: Failed to allocate memory for MIC object\n");
		ret = -ENOMEM;
		goto err;
	}

	mic->dev = dev;

	ret = parse_dt(mic);
	if (ret)
		goto err;

	ret = of_address_to_resource(dev->of_node, 0, &res);
	if (ret) {
		DRM_ERROR("mic: Failed to get mem region for MIC\n");
		goto err;
	}
	mic->reg = devm_ioremap(dev, res.start, resource_size(&res));
	if (!mic->reg) {
		DRM_ERROR("mic: Failed to remap for MIC\n");
		ret = -ENOMEM;
		goto err;
	}

	mic->sysreg = syscon_regmap_lookup_by_phandle(dev->of_node,
							"samsung,disp-syscon");
	if (IS_ERR(mic->sysreg)) {
		DRM_ERROR("mic: Failed to get system register.\n");
		ret = PTR_ERR(mic->sysreg);
		goto err;
	}

	for (i = 0; i < NUM_CLKS; i++) {
		mic->clks[i] = devm_clk_get(dev, clk_names[i]);
		if (IS_ERR(mic->clks[i])) {
			DRM_ERROR("mic: Failed to get clock (%s)\n",
								clk_names[i]);
			ret = PTR_ERR(mic->clks[i]);
			goto err;
		}
	}

	platform_set_drvdata(pdev, mic);

	DRM_DEBUG_KMS("MIC has been probed\n");
	return component_add(dev, &exynos_mic_component_ops);

err:
	return ret;
}

static int exynos_mic_remove(struct platform_device *pdev)
{
	component_del(&pdev->dev, &exynos_mic_component_ops);
	return 0;
}

static const struct of_device_id exynos_mic_of_match[] = {
	{ .compatible = "samsung,exynos5433-mic" },
	{ }
};
MODULE_DEVICE_TABLE(of, exynos_mic_of_match);

struct platform_driver mic_driver = {
	.probe		= exynos_mic_probe,
	.remove		= exynos_mic_remove,
	.driver		= {
		.name	= "exynos-mic",
		.owner	= THIS_MODULE,
		.of_match_table = exynos_mic_of_match,
	},
};