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
92static const char *const clk_names[] = { "pclk_mic0", "sclk_rgb_vclk_to_mic0" };
93#define NUM_CLKS ARRAY_SIZE(clk_names)
94static DEFINE_MUTEX(mic_mutex);
95
96struct 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
109static void mic_set_path(struct exynos_mic *mic, bool enable)
110{
111 int ret;
112 unsigned int val;
113
114 ret = regmap_read(map: mic->sysreg, DSD_CFG_MUX, val: &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(map: 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
137static int mic_sw_reset(struct exynos_mic *mic)
138{
139 unsigned int retry = 100;
140 int ret;
141
142 writel(MIC_SW_RST, addr: mic->reg + MIC_OP);
143
144 while (retry-- > 0) {
145 ret = readl(addr: mic->reg + MIC_OP);
146 if (!(ret & MIC_SW_RST))
147 return 0;
148
149 udelay(10);
150 }
151
152 return -ETIMEDOUT;
153}
154
155static 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(val: reg, addr: mic->reg + MIC_V_TIMING_0);
164
165 reg = MIC_VBP_SIZE(vm.vback_porch) +
166 MIC_VFP_SIZE(vm.vfront_porch);
167 writel(val: reg, addr: 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(val: reg, addr: mic->reg + MIC_INPUT_TIMING_0);
173
174 reg = MIC_VBP_SIZE(vm.hback_porch) +
175 MIC_VFP_SIZE(vm.hfront_porch);
176 writel(val: reg, addr: mic->reg + MIC_INPUT_TIMING_1);
177}
178
179static 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(val: reg, addr: mic->reg + MIC_IMG_SIZE);
188}
189
190static 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(val: reg, addr: 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(val: reg, addr: 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(val: reg, addr: mic->reg + MIC_2D_OUTPUT_TIMING_1);
209 }
210}
211
212static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
213{
214 u32 reg = readl(addr: 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(val: reg, addr: mic->reg + MIC_OP);
229}
230
231static 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, enable: 0);
240
241 pm_runtime_put(dev: mic->dev);
242 mic->enabled = 0;
243
244already_disabled:
245 mutex_unlock(lock: &mic_mutex);
246}
247
248static 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(dmode: mode, vm: &mic->vm);
256 mic->i80_mode = to_exynos_crtc(bridge->encoder->crtc)->i80_mode;
257 mutex_unlock(lock: &mic_mutex);
258}
259
260static 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(dev: mic->dev);
270 if (ret < 0)
271 goto unlock;
272
273 mic_set_path(mic, enable: 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, enable: 1);
286 mic->enabled = 1;
287 mutex_unlock(lock: &mic_mutex);
288
289 return;
290
291turn_off:
292 pm_runtime_put(dev: mic->dev);
293unlock:
294 mutex_unlock(lock: &mic_mutex);
295}
296
297static 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
303static 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 out_type: 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: &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, bridge: &mic->bridge, NULL, flags: 0);
321}
322
323static 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(dev: mic->dev);
333
334already_disabled:
335 mutex_unlock(lock: &mic_mutex);
336}
337
338static const struct component_ops exynos_mic_component_ops = {
339 .bind = exynos_mic_bind,
340 .unbind = exynos_mic_unbind,
341};
342
343static 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(clk: mic->clks[i]);
350
351 return 0;
352}
353
354static 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(clk: 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(clk: mic->clks[i]);
366 return ret;
367 }
368 }
369 return 0;
370}
371
372static DEFINE_RUNTIME_DEV_PM_OPS(exynos_mic_pm_ops, exynos_mic_suspend,
373 exynos_mic_resume, NULL);
374
375static 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, size: 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: dev->of_node, index: 0, r: &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, offset: res.start, size: resource_size(res: &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(np: dev->of_node,
405 property: "samsung,disp-syscon");
406 if (IS_ERR(ptr: mic->sysreg)) {
407 DRM_DEV_ERROR(dev, "mic: Failed to get system register.\n");
408 ret = PTR_ERR(ptr: mic->sysreg);
409 goto err;
410 }
411
412 for (i = 0; i < NUM_CLKS; i++) {
413 mic->clks[i] = devm_clk_get(dev, id: clk_names[i]);
414 if (IS_ERR(ptr: mic->clks[i])) {
415 DRM_DEV_ERROR(dev, "mic: Failed to get clock (%s)\n",
416 clk_names[i]);
417 ret = PTR_ERR(ptr: mic->clks[i]);
418 goto err;
419 }
420 }
421
422 platform_set_drvdata(pdev, data: mic);
423
424 mic->bridge.funcs = &mic_bridge_funcs;
425 mic->bridge.of_node = dev->of_node;
426
427 drm_bridge_add(bridge: &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
439err_pm:
440 pm_runtime_disable(dev);
441err:
442 return ret;
443}
444
445static void 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(dev: &pdev->dev);
451
452 drm_bridge_remove(bridge: &mic->bridge);
453}
454
455static const struct of_device_id exynos_mic_of_match[] = {
456 { .compatible = "samsung,exynos5433-mic" },
457 { }
458};
459MODULE_DEVICE_TABLE(of, exynos_mic_of_match);
460
461struct platform_driver mic_driver = {
462 .probe = exynos_mic_probe,
463 .remove_new = exynos_mic_remove,
464 .driver = {
465 .name = "exynos-mic",
466 .pm = pm_ptr(&exynos_mic_pm_ops),
467 .owner = THIS_MODULE,
468 .of_match_table = exynos_mic_of_match,
469 },
470};
471

source code of linux/drivers/gpu/drm/exynos/exynos_drm_mic.c