1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2015 Samsung Electronics Co.Ltd
4  * Authors:
5  *	Hyungwon Hwang <human.hwang@samsung.com>
6  */
7 
8 #include <linux/clk.h>
9 #include <linux/component.h>
10 #include <linux/delay.h>
11 #include <linux/mfd/syscon.h>
12 #include <linux/module.h>
13 #include <linux/mutex.h>
14 #include <linux/of.h>
15 #include <linux/of_address.h>
16 #include <linux/of_graph.h>
17 #include <linux/platform_device.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/regmap.h>
20 
21 #include <video/of_videomode.h>
22 #include <video/videomode.h>
23 
24 #include <drm/drm_bridge.h>
25 #include <drm/drm_encoder.h>
26 #include <drm/drm_print.h>
27 
28 #include "exynos_drm_drv.h"
29 #include "exynos_drm_crtc.h"
30 
31 /* Sysreg registers for MIC */
32 #define DSD_CFG_MUX	0x1004
33 #define MIC0_RGB_MUX	(1 << 0)
34 #define MIC0_I80_MUX	(1 << 1)
35 #define MIC0_ON_MUX	(1 << 5)
36 
37 /* MIC registers */
38 #define MIC_OP				0x0
39 #define MIC_IP_VER			0x0004
40 #define MIC_V_TIMING_0			0x0008
41 #define MIC_V_TIMING_1			0x000C
42 #define MIC_IMG_SIZE			0x0010
43 #define MIC_INPUT_TIMING_0		0x0014
44 #define MIC_INPUT_TIMING_1		0x0018
45 #define MIC_2D_OUTPUT_TIMING_0		0x001C
46 #define MIC_2D_OUTPUT_TIMING_1		0x0020
47 #define MIC_2D_OUTPUT_TIMING_2		0x0024
48 #define MIC_3D_OUTPUT_TIMING_0		0x0028
49 #define MIC_3D_OUTPUT_TIMING_1		0x002C
50 #define MIC_3D_OUTPUT_TIMING_2		0x0030
51 #define MIC_CORE_PARA_0			0x0034
52 #define MIC_CORE_PARA_1			0x0038
53 #define MIC_CTC_CTRL			0x0040
54 #define MIC_RD_DATA			0x0044
55 
56 #define MIC_UPD_REG			(1 << 31)
57 #define MIC_ON_REG			(1 << 30)
58 #define MIC_TD_ON_REG			(1 << 29)
59 #define MIC_BS_CHG_OUT			(1 << 16)
60 #define MIC_VIDEO_TYPE(x)		(((x) & 0xf) << 12)
61 #define MIC_PSR_EN			(1 << 5)
62 #define MIC_SW_RST			(1 << 4)
63 #define MIC_ALL_RST			(1 << 3)
64 #define MIC_CORE_VER_CONTROL		(1 << 2)
65 #define MIC_MODE_SEL_COMMAND_MODE	(1 << 1)
66 #define MIC_MODE_SEL_MASK		(1 << 1)
67 #define MIC_CORE_EN			(1 << 0)
68 
69 #define MIC_V_PULSE_WIDTH(x)		(((x) & 0x3fff) << 16)
70 #define MIC_V_PERIOD_LINE(x)		((x) & 0x3fff)
71 
72 #define MIC_VBP_SIZE(x)			(((x) & 0x3fff) << 16)
73 #define MIC_VFP_SIZE(x)			((x) & 0x3fff)
74 
75 #define MIC_IMG_V_SIZE(x)		(((x) & 0x3fff) << 16)
76 #define MIC_IMG_H_SIZE(x)		((x) & 0x3fff)
77 
78 #define MIC_H_PULSE_WIDTH_IN(x)		(((x) & 0x3fff) << 16)
79 #define MIC_H_PERIOD_PIXEL_IN(x)	((x) & 0x3fff)
80 
81 #define MIC_HBP_SIZE_IN(x)		(((x) & 0x3fff) << 16)
82 #define MIC_HFP_SIZE_IN(x)		((x) & 0x3fff)
83 
84 #define MIC_H_PULSE_WIDTH_2D(x)		(((x) & 0x3fff) << 16)
85 #define MIC_H_PERIOD_PIXEL_2D(x)	((x) & 0x3fff)
86 
87 #define MIC_HBP_SIZE_2D(x)		(((x) & 0x3fff) << 16)
88 #define MIC_HFP_SIZE_2D(x)		((x) & 0x3fff)
89 
90 #define MIC_BS_SIZE_2D(x)	((x) & 0x3fff)
91 
92 static const char *const clk_names[] = { "pclk_mic0", "sclk_rgb_vclk_to_mic0" };
93 #define NUM_CLKS		ARRAY_SIZE(clk_names)
94 static DEFINE_MUTEX(mic_mutex);
95 
96 struct exynos_mic {
97 	struct device *dev;
98 	void __iomem *reg;
99 	struct regmap *sysreg;
100 	struct clk *clks[NUM_CLKS];
101 
102 	bool i80_mode;
103 	struct videomode vm;
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_post_disable(struct drm_bridge *bridge)
232 {
233 	struct exynos_mic *mic = bridge->driver_private;
234 
235 	mutex_lock(&mic_mutex);
236 	if (!mic->enabled)
237 		goto already_disabled;
238 
239 	mic_set_path(mic, 0);
240 
241 	pm_runtime_put(mic->dev);
242 	mic->enabled = 0;
243 
244 already_disabled:
245 	mutex_unlock(&mic_mutex);
246 }
247 
248 static void mic_mode_set(struct drm_bridge *bridge,
249 			 const struct drm_display_mode *mode,
250 			 const struct drm_display_mode *adjusted_mode)
251 {
252 	struct exynos_mic *mic = bridge->driver_private;
253 
254 	mutex_lock(&mic_mutex);
255 	drm_display_mode_to_videomode(mode, &mic->vm);
256 	mic->i80_mode = to_exynos_crtc(bridge->encoder->crtc)->i80_mode;
257 	mutex_unlock(&mic_mutex);
258 }
259 
260 static void mic_pre_enable(struct drm_bridge *bridge)
261 {
262 	struct exynos_mic *mic = bridge->driver_private;
263 	int ret;
264 
265 	mutex_lock(&mic_mutex);
266 	if (mic->enabled)
267 		goto unlock;
268 
269 	ret = pm_runtime_resume_and_get(mic->dev);
270 	if (ret < 0)
271 		goto unlock;
272 
273 	mic_set_path(mic, 1);
274 
275 	ret = mic_sw_reset(mic);
276 	if (ret) {
277 		DRM_DEV_ERROR(mic->dev, "Failed to reset\n");
278 		goto turn_off;
279 	}
280 
281 	if (!mic->i80_mode)
282 		mic_set_porch_timing(mic);
283 	mic_set_img_size(mic);
284 	mic_set_output_timing(mic);
285 	mic_set_reg_on(mic, 1);
286 	mic->enabled = 1;
287 	mutex_unlock(&mic_mutex);
288 
289 	return;
290 
291 turn_off:
292 	pm_runtime_put(mic->dev);
293 unlock:
294 	mutex_unlock(&mic_mutex);
295 }
296 
297 static const struct drm_bridge_funcs mic_bridge_funcs = {
298 	.post_disable = mic_post_disable,
299 	.mode_set = mic_mode_set,
300 	.pre_enable = mic_pre_enable,
301 };
302 
303 static int exynos_mic_bind(struct device *dev, struct device *master,
304 			   void *data)
305 {
306 	struct exynos_mic *mic = dev_get_drvdata(dev);
307 	struct drm_device *drm_dev = data;
308 	struct exynos_drm_crtc *crtc = exynos_drm_crtc_get_by_type(drm_dev,
309 						       EXYNOS_DISPLAY_TYPE_LCD);
310 	struct drm_encoder *e, *encoder = NULL;
311 
312 	drm_for_each_encoder(e, drm_dev)
313 		if (e->possible_crtcs == drm_crtc_mask(&crtc->base))
314 			encoder = e;
315 	if (!encoder)
316 		return -ENODEV;
317 
318 	mic->bridge.driver_private = mic;
319 
320 	return drm_bridge_attach(encoder, &mic->bridge, NULL, 0);
321 }
322 
323 static void exynos_mic_unbind(struct device *dev, struct device *master,
324 			      void *data)
325 {
326 	struct exynos_mic *mic = dev_get_drvdata(dev);
327 
328 	mutex_lock(&mic_mutex);
329 	if (!mic->enabled)
330 		goto already_disabled;
331 
332 	pm_runtime_put(mic->dev);
333 
334 already_disabled:
335 	mutex_unlock(&mic_mutex);
336 }
337 
338 static const struct component_ops exynos_mic_component_ops = {
339 	.bind	= exynos_mic_bind,
340 	.unbind	= exynos_mic_unbind,
341 };
342 
343 static int exynos_mic_suspend(struct device *dev)
344 {
345 	struct exynos_mic *mic = dev_get_drvdata(dev);
346 	int i;
347 
348 	for (i = NUM_CLKS - 1; i > -1; i--)
349 		clk_disable_unprepare(mic->clks[i]);
350 
351 	return 0;
352 }
353 
354 static int exynos_mic_resume(struct device *dev)
355 {
356 	struct exynos_mic *mic = dev_get_drvdata(dev);
357 	int ret, i;
358 
359 	for (i = 0; i < NUM_CLKS; i++) {
360 		ret = clk_prepare_enable(mic->clks[i]);
361 		if (ret < 0) {
362 			DRM_DEV_ERROR(dev, "Failed to enable clock (%s)\n",
363 				      clk_names[i]);
364 			while (--i > -1)
365 				clk_disable_unprepare(mic->clks[i]);
366 			return ret;
367 		}
368 	}
369 	return 0;
370 }
371 
372 static DEFINE_RUNTIME_DEV_PM_OPS(exynos_mic_pm_ops, exynos_mic_suspend,
373 				 exynos_mic_resume, NULL);
374 
375 static int exynos_mic_probe(struct platform_device *pdev)
376 {
377 	struct device *dev = &pdev->dev;
378 	struct exynos_mic *mic;
379 	struct resource res;
380 	int ret, i;
381 
382 	mic = devm_kzalloc(dev, sizeof(*mic), GFP_KERNEL);
383 	if (!mic) {
384 		DRM_DEV_ERROR(dev,
385 			      "mic: Failed to allocate memory for MIC object\n");
386 		ret = -ENOMEM;
387 		goto err;
388 	}
389 
390 	mic->dev = dev;
391 
392 	ret = of_address_to_resource(dev->of_node, 0, &res);
393 	if (ret) {
394 		DRM_DEV_ERROR(dev, "mic: Failed to get mem region for MIC\n");
395 		goto err;
396 	}
397 	mic->reg = devm_ioremap(dev, res.start, resource_size(&res));
398 	if (!mic->reg) {
399 		DRM_DEV_ERROR(dev, "mic: Failed to remap for MIC\n");
400 		ret = -ENOMEM;
401 		goto err;
402 	}
403 
404 	mic->sysreg = syscon_regmap_lookup_by_phandle(dev->of_node,
405 							"samsung,disp-syscon");
406 	if (IS_ERR(mic->sysreg)) {
407 		DRM_DEV_ERROR(dev, "mic: Failed to get system register.\n");
408 		ret = PTR_ERR(mic->sysreg);
409 		goto err;
410 	}
411 
412 	for (i = 0; i < NUM_CLKS; i++) {
413 		mic->clks[i] = devm_clk_get(dev, clk_names[i]);
414 		if (IS_ERR(mic->clks[i])) {
415 			DRM_DEV_ERROR(dev, "mic: Failed to get clock (%s)\n",
416 				      clk_names[i]);
417 			ret = PTR_ERR(mic->clks[i]);
418 			goto err;
419 		}
420 	}
421 
422 	platform_set_drvdata(pdev, mic);
423 
424 	mic->bridge.funcs = &mic_bridge_funcs;
425 	mic->bridge.of_node = dev->of_node;
426 
427 	drm_bridge_add(&mic->bridge);
428 
429 	pm_runtime_enable(dev);
430 
431 	ret = component_add(dev, &exynos_mic_component_ops);
432 	if (ret)
433 		goto err_pm;
434 
435 	DRM_DEV_DEBUG_KMS(dev, "MIC has been probed\n");
436 
437 	return 0;
438 
439 err_pm:
440 	pm_runtime_disable(dev);
441 err:
442 	return ret;
443 }
444 
445 static int exynos_mic_remove(struct platform_device *pdev)
446 {
447 	struct exynos_mic *mic = platform_get_drvdata(pdev);
448 
449 	component_del(&pdev->dev, &exynos_mic_component_ops);
450 	pm_runtime_disable(&pdev->dev);
451 
452 	drm_bridge_remove(&mic->bridge);
453 
454 	return 0;
455 }
456 
457 static const struct of_device_id exynos_mic_of_match[] = {
458 	{ .compatible = "samsung,exynos5433-mic" },
459 	{ }
460 };
461 MODULE_DEVICE_TABLE(of, exynos_mic_of_match);
462 
463 struct platform_driver mic_driver = {
464 	.probe		= exynos_mic_probe,
465 	.remove		= exynos_mic_remove,
466 	.driver		= {
467 		.name	= "exynos-mic",
468 		.pm	= pm_ptr(&exynos_mic_pm_ops),
469 		.owner	= THIS_MODULE,
470 		.of_match_table = exynos_mic_of_match,
471 	},
472 };
473