1 /*
2  * Copyright (C) 2015 Samsung Electronics Co.Ltd
3  * Authors:
4  *	Hyungwon Hwang <human.hwang@samsung.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundationr
9  */
10 
11 #include <linux/platform_device.h>
12 #include <video/of_videomode.h>
13 #include <linux/of_address.h>
14 #include <video/videomode.h>
15 #include <linux/module.h>
16 #include <linux/delay.h>
17 #include <linux/mutex.h>
18 #include <linux/of.h>
19 #include <linux/of_graph.h>
20 #include <linux/clk.h>
21 #include <linux/component.h>
22 #include <linux/pm_runtime.h>
23 #include <drm/drmP.h>
24 #include <drm/drm_encoder.h>
25 #include <linux/mfd/syscon.h>
26 #include <linux/regmap.h>
27 
28 #include "exynos_drm_drv.h"
29 
30 /* Sysreg registers for MIC */
31 #define DSD_CFG_MUX	0x1004
32 #define MIC0_RGB_MUX	(1 << 0)
33 #define MIC0_I80_MUX	(1 << 1)
34 #define MIC0_ON_MUX	(1 << 5)
35 
36 /* MIC registers */
37 #define MIC_OP				0x0
38 #define MIC_IP_VER			0x0004
39 #define MIC_V_TIMING_0			0x0008
40 #define MIC_V_TIMING_1			0x000C
41 #define MIC_IMG_SIZE			0x0010
42 #define MIC_INPUT_TIMING_0		0x0014
43 #define MIC_INPUT_TIMING_1		0x0018
44 #define MIC_2D_OUTPUT_TIMING_0		0x001C
45 #define MIC_2D_OUTPUT_TIMING_1		0x0020
46 #define MIC_2D_OUTPUT_TIMING_2		0x0024
47 #define MIC_3D_OUTPUT_TIMING_0		0x0028
48 #define MIC_3D_OUTPUT_TIMING_1		0x002C
49 #define MIC_3D_OUTPUT_TIMING_2		0x0030
50 #define MIC_CORE_PARA_0			0x0034
51 #define MIC_CORE_PARA_1			0x0038
52 #define MIC_CTC_CTRL			0x0040
53 #define MIC_RD_DATA			0x0044
54 
55 #define MIC_UPD_REG			(1 << 31)
56 #define MIC_ON_REG			(1 << 30)
57 #define MIC_TD_ON_REG			(1 << 29)
58 #define MIC_BS_CHG_OUT			(1 << 16)
59 #define MIC_VIDEO_TYPE(x)		(((x) & 0xf) << 12)
60 #define MIC_PSR_EN			(1 << 5)
61 #define MIC_SW_RST			(1 << 4)
62 #define MIC_ALL_RST			(1 << 3)
63 #define MIC_CORE_VER_CONTROL		(1 << 2)
64 #define MIC_MODE_SEL_COMMAND_MODE	(1 << 1)
65 #define MIC_MODE_SEL_MASK		(1 << 1)
66 #define MIC_CORE_EN			(1 << 0)
67 
68 #define MIC_V_PULSE_WIDTH(x)		(((x) & 0x3fff) << 16)
69 #define MIC_V_PERIOD_LINE(x)		((x) & 0x3fff)
70 
71 #define MIC_VBP_SIZE(x)			(((x) & 0x3fff) << 16)
72 #define MIC_VFP_SIZE(x)			((x) & 0x3fff)
73 
74 #define MIC_IMG_V_SIZE(x)		(((x) & 0x3fff) << 16)
75 #define MIC_IMG_H_SIZE(x)		((x) & 0x3fff)
76 
77 #define MIC_H_PULSE_WIDTH_IN(x)		(((x) & 0x3fff) << 16)
78 #define MIC_H_PERIOD_PIXEL_IN(x)	((x) & 0x3fff)
79 
80 #define MIC_HBP_SIZE_IN(x)		(((x) & 0x3fff) << 16)
81 #define MIC_HFP_SIZE_IN(x)		((x) & 0x3fff)
82 
83 #define MIC_H_PULSE_WIDTH_2D(x)		(((x) & 0x3fff) << 16)
84 #define MIC_H_PERIOD_PIXEL_2D(x)	((x) & 0x3fff)
85 
86 #define MIC_HBP_SIZE_2D(x)		(((x) & 0x3fff) << 16)
87 #define MIC_HFP_SIZE_2D(x)		((x) & 0x3fff)
88 
89 #define MIC_BS_SIZE_2D(x)	((x) & 0x3fff)
90 
91 static char *clk_names[] = { "pclk_mic0", "sclk_rgb_vclk_to_mic0" };
92 #define NUM_CLKS		ARRAY_SIZE(clk_names)
93 static DEFINE_MUTEX(mic_mutex);
94 
95 struct exynos_mic {
96 	struct device *dev;
97 	void __iomem *reg;
98 	struct regmap *sysreg;
99 	struct clk *clks[NUM_CLKS];
100 
101 	bool i80_mode;
102 	struct videomode vm;
103 	struct drm_encoder *encoder;
104 	struct drm_bridge bridge;
105 
106 	bool enabled;
107 };
108 
109 static void mic_set_path(struct exynos_mic *mic, bool enable)
110 {
111 	int ret;
112 	unsigned int val;
113 
114 	ret = regmap_read(mic->sysreg, DSD_CFG_MUX, &val);
115 	if (ret) {
116 		DRM_DEV_ERROR(mic->dev,
117 			      "mic: Failed to read system register\n");
118 		return;
119 	}
120 
121 	if (enable) {
122 		if (mic->i80_mode)
123 			val |= MIC0_I80_MUX;
124 		else
125 			val |= MIC0_RGB_MUX;
126 
127 		val |=  MIC0_ON_MUX;
128 	} else
129 		val &= ~(MIC0_RGB_MUX | MIC0_I80_MUX | MIC0_ON_MUX);
130 
131 	ret = regmap_write(mic->sysreg, DSD_CFG_MUX, val);
132 	if (ret)
133 		DRM_DEV_ERROR(mic->dev,
134 			      "mic: Failed to read system register\n");
135 }
136 
137 static int mic_sw_reset(struct exynos_mic *mic)
138 {
139 	unsigned int retry = 100;
140 	int ret;
141 
142 	writel(MIC_SW_RST, mic->reg + MIC_OP);
143 
144 	while (retry-- > 0) {
145 		ret = readl(mic->reg + MIC_OP);
146 		if (!(ret & MIC_SW_RST))
147 			return 0;
148 
149 		udelay(10);
150 	}
151 
152 	return -ETIMEDOUT;
153 }
154 
155 static void mic_set_porch_timing(struct exynos_mic *mic)
156 {
157 	struct videomode vm = mic->vm;
158 	u32 reg;
159 
160 	reg = MIC_V_PULSE_WIDTH(vm.vsync_len) +
161 		MIC_V_PERIOD_LINE(vm.vsync_len + vm.vactive +
162 				vm.vback_porch + vm.vfront_porch);
163 	writel(reg, mic->reg + MIC_V_TIMING_0);
164 
165 	reg = MIC_VBP_SIZE(vm.vback_porch) +
166 		MIC_VFP_SIZE(vm.vfront_porch);
167 	writel(reg, mic->reg + MIC_V_TIMING_1);
168 
169 	reg = MIC_V_PULSE_WIDTH(vm.hsync_len) +
170 		MIC_V_PERIOD_LINE(vm.hsync_len + vm.hactive +
171 				vm.hback_porch + vm.hfront_porch);
172 	writel(reg, mic->reg + MIC_INPUT_TIMING_0);
173 
174 	reg = MIC_VBP_SIZE(vm.hback_porch) +
175 		MIC_VFP_SIZE(vm.hfront_porch);
176 	writel(reg, mic->reg + MIC_INPUT_TIMING_1);
177 }
178 
179 static void mic_set_img_size(struct exynos_mic *mic)
180 {
181 	struct videomode *vm = &mic->vm;
182 	u32 reg;
183 
184 	reg = MIC_IMG_H_SIZE(vm->hactive) +
185 		MIC_IMG_V_SIZE(vm->vactive);
186 
187 	writel(reg, mic->reg + MIC_IMG_SIZE);
188 }
189 
190 static void mic_set_output_timing(struct exynos_mic *mic)
191 {
192 	struct videomode vm = mic->vm;
193 	u32 reg, bs_size_2d;
194 
195 	DRM_DEV_DEBUG(mic->dev, "w: %u, h: %u\n", vm.hactive, vm.vactive);
196 	bs_size_2d = ((vm.hactive >> 2) << 1) + (vm.vactive % 4);
197 	reg = MIC_BS_SIZE_2D(bs_size_2d);
198 	writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_2);
199 
200 	if (!mic->i80_mode) {
201 		reg = MIC_H_PULSE_WIDTH_2D(vm.hsync_len) +
202 			MIC_H_PERIOD_PIXEL_2D(vm.hsync_len + bs_size_2d +
203 					vm.hback_porch + vm.hfront_porch);
204 		writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_0);
205 
206 		reg = MIC_HBP_SIZE_2D(vm.hback_porch) +
207 			MIC_H_PERIOD_PIXEL_2D(vm.hfront_porch);
208 		writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_1);
209 	}
210 }
211 
212 static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
213 {
214 	u32 reg = readl(mic->reg + MIC_OP);
215 
216 	if (enable) {
217 		reg &= ~(MIC_MODE_SEL_MASK | MIC_CORE_VER_CONTROL | MIC_PSR_EN);
218 		reg |= (MIC_CORE_EN | MIC_BS_CHG_OUT | MIC_ON_REG);
219 
220 		reg  &= ~MIC_MODE_SEL_COMMAND_MODE;
221 		if (mic->i80_mode)
222 			reg |= MIC_MODE_SEL_COMMAND_MODE;
223 	} else {
224 		reg &= ~MIC_CORE_EN;
225 	}
226 
227 	reg |= MIC_UPD_REG;
228 	writel(reg, mic->reg + MIC_OP);
229 }
230 
231 static void mic_disable(struct drm_bridge *bridge) { }
232 
233 static void mic_post_disable(struct drm_bridge *bridge)
234 {
235 	struct exynos_mic *mic = bridge->driver_private;
236 
237 	mutex_lock(&mic_mutex);
238 	if (!mic->enabled)
239 		goto already_disabled;
240 
241 	mic_set_path(mic, 0);
242 
243 	pm_runtime_put(mic->dev);
244 	mic->enabled = 0;
245 
246 already_disabled:
247 	mutex_unlock(&mic_mutex);
248 }
249 
250 static void mic_mode_set(struct drm_bridge *bridge,
251 			 const struct drm_display_mode *mode,
252 			 const struct drm_display_mode *adjusted_mode)
253 {
254 	struct exynos_mic *mic = bridge->driver_private;
255 
256 	mutex_lock(&mic_mutex);
257 	drm_display_mode_to_videomode(mode, &mic->vm);
258 	mic->i80_mode = to_exynos_crtc(bridge->encoder->crtc)->i80_mode;
259 	mutex_unlock(&mic_mutex);
260 }
261 
262 static void mic_pre_enable(struct drm_bridge *bridge)
263 {
264 	struct exynos_mic *mic = bridge->driver_private;
265 	int ret;
266 
267 	mutex_lock(&mic_mutex);
268 	if (mic->enabled)
269 		goto unlock;
270 
271 	ret = pm_runtime_get_sync(mic->dev);
272 	if (ret < 0)
273 		goto unlock;
274 
275 	mic_set_path(mic, 1);
276 
277 	ret = mic_sw_reset(mic);
278 	if (ret) {
279 		DRM_DEV_ERROR(mic->dev, "Failed to reset\n");
280 		goto turn_off;
281 	}
282 
283 	if (!mic->i80_mode)
284 		mic_set_porch_timing(mic);
285 	mic_set_img_size(mic);
286 	mic_set_output_timing(mic);
287 	mic_set_reg_on(mic, 1);
288 	mic->enabled = 1;
289 	mutex_unlock(&mic_mutex);
290 
291 	return;
292 
293 turn_off:
294 	pm_runtime_put(mic->dev);
295 unlock:
296 	mutex_unlock(&mic_mutex);
297 }
298 
299 static void mic_enable(struct drm_bridge *bridge) { }
300 
301 static const struct drm_bridge_funcs mic_bridge_funcs = {
302 	.disable = mic_disable,
303 	.post_disable = mic_post_disable,
304 	.mode_set = mic_mode_set,
305 	.pre_enable = mic_pre_enable,
306 	.enable = mic_enable,
307 };
308 
309 static int exynos_mic_bind(struct device *dev, struct device *master,
310 			   void *data)
311 {
312 	struct exynos_mic *mic = dev_get_drvdata(dev);
313 
314 	mic->bridge.driver_private = mic;
315 
316 	return 0;
317 }
318 
319 static void exynos_mic_unbind(struct device *dev, struct device *master,
320 			      void *data)
321 {
322 	struct exynos_mic *mic = dev_get_drvdata(dev);
323 
324 	mutex_lock(&mic_mutex);
325 	if (!mic->enabled)
326 		goto already_disabled;
327 
328 	pm_runtime_put(mic->dev);
329 
330 already_disabled:
331 	mutex_unlock(&mic_mutex);
332 }
333 
334 static const struct component_ops exynos_mic_component_ops = {
335 	.bind	= exynos_mic_bind,
336 	.unbind	= exynos_mic_unbind,
337 };
338 
339 #ifdef CONFIG_PM
340 static int exynos_mic_suspend(struct device *dev)
341 {
342 	struct exynos_mic *mic = dev_get_drvdata(dev);
343 	int i;
344 
345 	for (i = NUM_CLKS - 1; i > -1; i--)
346 		clk_disable_unprepare(mic->clks[i]);
347 
348 	return 0;
349 }
350 
351 static int exynos_mic_resume(struct device *dev)
352 {
353 	struct exynos_mic *mic = dev_get_drvdata(dev);
354 	int ret, i;
355 
356 	for (i = 0; i < NUM_CLKS; i++) {
357 		ret = clk_prepare_enable(mic->clks[i]);
358 		if (ret < 0) {
359 			DRM_DEV_ERROR(dev, "Failed to enable clock (%s)\n",
360 				      clk_names[i]);
361 			while (--i > -1)
362 				clk_disable_unprepare(mic->clks[i]);
363 			return ret;
364 		}
365 	}
366 	return 0;
367 }
368 #endif
369 
370 static const struct dev_pm_ops exynos_mic_pm_ops = {
371 	SET_RUNTIME_PM_OPS(exynos_mic_suspend, exynos_mic_resume, NULL)
372 	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
373 				pm_runtime_force_resume)
374 };
375 
376 static int exynos_mic_probe(struct platform_device *pdev)
377 {
378 	struct device *dev = &pdev->dev;
379 	struct exynos_mic *mic;
380 	struct resource res;
381 	int ret, i;
382 
383 	mic = devm_kzalloc(dev, sizeof(*mic), GFP_KERNEL);
384 	if (!mic) {
385 		DRM_DEV_ERROR(dev,
386 			      "mic: Failed to allocate memory for MIC object\n");
387 		ret = -ENOMEM;
388 		goto err;
389 	}
390 
391 	mic->dev = dev;
392 
393 	ret = of_address_to_resource(dev->of_node, 0, &res);
394 	if (ret) {
395 		DRM_DEV_ERROR(dev, "mic: Failed to get mem region for MIC\n");
396 		goto err;
397 	}
398 	mic->reg = devm_ioremap(dev, res.start, resource_size(&res));
399 	if (!mic->reg) {
400 		DRM_DEV_ERROR(dev, "mic: Failed to remap for MIC\n");
401 		ret = -ENOMEM;
402 		goto err;
403 	}
404 
405 	mic->sysreg = syscon_regmap_lookup_by_phandle(dev->of_node,
406 							"samsung,disp-syscon");
407 	if (IS_ERR(mic->sysreg)) {
408 		DRM_DEV_ERROR(dev, "mic: Failed to get system register.\n");
409 		ret = PTR_ERR(mic->sysreg);
410 		goto err;
411 	}
412 
413 	for (i = 0; i < NUM_CLKS; i++) {
414 		mic->clks[i] = devm_clk_get(dev, clk_names[i]);
415 		if (IS_ERR(mic->clks[i])) {
416 			DRM_DEV_ERROR(dev, "mic: Failed to get clock (%s)\n",
417 				      clk_names[i]);
418 			ret = PTR_ERR(mic->clks[i]);
419 			goto err;
420 		}
421 	}
422 
423 	platform_set_drvdata(pdev, mic);
424 
425 	mic->bridge.funcs = &mic_bridge_funcs;
426 	mic->bridge.of_node = dev->of_node;
427 
428 	drm_bridge_add(&mic->bridge);
429 
430 	pm_runtime_enable(dev);
431 
432 	ret = component_add(dev, &exynos_mic_component_ops);
433 	if (ret)
434 		goto err_pm;
435 
436 	DRM_DEV_DEBUG_KMS(dev, "MIC has been probed\n");
437 
438 	return 0;
439 
440 err_pm:
441 	pm_runtime_disable(dev);
442 err:
443 	return ret;
444 }
445 
446 static int exynos_mic_remove(struct platform_device *pdev)
447 {
448 	struct exynos_mic *mic = platform_get_drvdata(pdev);
449 
450 	component_del(&pdev->dev, &exynos_mic_component_ops);
451 	pm_runtime_disable(&pdev->dev);
452 
453 	drm_bridge_remove(&mic->bridge);
454 
455 	return 0;
456 }
457 
458 static const struct of_device_id exynos_mic_of_match[] = {
459 	{ .compatible = "samsung,exynos5433-mic" },
460 	{ }
461 };
462 MODULE_DEVICE_TABLE(of, exynos_mic_of_match);
463 
464 struct platform_driver mic_driver = {
465 	.probe		= exynos_mic_probe,
466 	.remove		= exynos_mic_remove,
467 	.driver		= {
468 		.name	= "exynos-mic",
469 		.pm	= &exynos_mic_pm_ops,
470 		.owner	= THIS_MODULE,
471 		.of_match_table = exynos_mic_of_match,
472 	},
473 };
474