Loading...
Note: File does not exist in v3.1.
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 <drm/drmP.h>
23#include <linux/mfd/syscon.h>
24#include <linux/regmap.h>
25
26/* Sysreg registers for MIC */
27#define DSD_CFG_MUX 0x1004
28#define MIC0_RGB_MUX (1 << 0)
29#define MIC0_I80_MUX (1 << 1)
30#define MIC0_ON_MUX (1 << 5)
31
32/* MIC registers */
33#define MIC_OP 0x0
34#define MIC_IP_VER 0x0004
35#define MIC_V_TIMING_0 0x0008
36#define MIC_V_TIMING_1 0x000C
37#define MIC_IMG_SIZE 0x0010
38#define MIC_INPUT_TIMING_0 0x0014
39#define MIC_INPUT_TIMING_1 0x0018
40#define MIC_2D_OUTPUT_TIMING_0 0x001C
41#define MIC_2D_OUTPUT_TIMING_1 0x0020
42#define MIC_2D_OUTPUT_TIMING_2 0x0024
43#define MIC_3D_OUTPUT_TIMING_0 0x0028
44#define MIC_3D_OUTPUT_TIMING_1 0x002C
45#define MIC_3D_OUTPUT_TIMING_2 0x0030
46#define MIC_CORE_PARA_0 0x0034
47#define MIC_CORE_PARA_1 0x0038
48#define MIC_CTC_CTRL 0x0040
49#define MIC_RD_DATA 0x0044
50
51#define MIC_UPD_REG (1 << 31)
52#define MIC_ON_REG (1 << 30)
53#define MIC_TD_ON_REG (1 << 29)
54#define MIC_BS_CHG_OUT (1 << 16)
55#define MIC_VIDEO_TYPE(x) (((x) & 0xf) << 12)
56#define MIC_PSR_EN (1 << 5)
57#define MIC_SW_RST (1 << 4)
58#define MIC_ALL_RST (1 << 3)
59#define MIC_CORE_VER_CONTROL (1 << 2)
60#define MIC_MODE_SEL_COMMAND_MODE (1 << 1)
61#define MIC_MODE_SEL_MASK (1 << 1)
62#define MIC_CORE_EN (1 << 0)
63
64#define MIC_V_PULSE_WIDTH(x) (((x) & 0x3fff) << 16)
65#define MIC_V_PERIOD_LINE(x) ((x) & 0x3fff)
66
67#define MIC_VBP_SIZE(x) (((x) & 0x3fff) << 16)
68#define MIC_VFP_SIZE(x) ((x) & 0x3fff)
69
70#define MIC_IMG_V_SIZE(x) (((x) & 0x3fff) << 16)
71#define MIC_IMG_H_SIZE(x) ((x) & 0x3fff)
72
73#define MIC_H_PULSE_WIDTH_IN(x) (((x) & 0x3fff) << 16)
74#define MIC_H_PERIOD_PIXEL_IN(x) ((x) & 0x3fff)
75
76#define MIC_HBP_SIZE_IN(x) (((x) & 0x3fff) << 16)
77#define MIC_HFP_SIZE_IN(x) ((x) & 0x3fff)
78
79#define MIC_H_PULSE_WIDTH_2D(x) (((x) & 0x3fff) << 16)
80#define MIC_H_PERIOD_PIXEL_2D(x) ((x) & 0x3fff)
81
82#define MIC_HBP_SIZE_2D(x) (((x) & 0x3fff) << 16)
83#define MIC_HFP_SIZE_2D(x) ((x) & 0x3fff)
84
85#define MIC_BS_SIZE_2D(x) ((x) & 0x3fff)
86
87enum {
88 ENDPOINT_DECON_NODE,
89 ENDPOINT_DSI_NODE,
90 NUM_ENDPOINTS
91};
92
93static char *clk_names[] = { "pclk_mic0", "sclk_rgb_vclk_to_mic0" };
94#define NUM_CLKS ARRAY_SIZE(clk_names)
95static DEFINE_MUTEX(mic_mutex);
96
97struct exynos_mic {
98 struct device *dev;
99 void __iomem *reg;
100 struct regmap *sysreg;
101 struct clk *clks[NUM_CLKS];
102
103 bool i80_mode;
104 struct videomode vm;
105 struct drm_encoder *encoder;
106 struct drm_bridge bridge;
107
108 bool enabled;
109};
110
111static void mic_set_path(struct exynos_mic *mic, bool enable)
112{
113 int ret;
114 unsigned int val;
115
116 ret = regmap_read(mic->sysreg, DSD_CFG_MUX, &val);
117 if (ret) {
118 DRM_ERROR("mic: Failed to read system register\n");
119 return;
120 }
121
122 if (enable) {
123 if (mic->i80_mode)
124 val |= MIC0_I80_MUX;
125 else
126 val |= MIC0_RGB_MUX;
127
128 val |= MIC0_ON_MUX;
129 } else
130 val &= ~(MIC0_RGB_MUX | MIC0_I80_MUX | MIC0_ON_MUX);
131
132 ret = regmap_write(mic->sysreg, DSD_CFG_MUX, val);
133 if (ret)
134 DRM_ERROR("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, 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
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(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
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(reg, 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_DEBUG("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
212static 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
231static struct device_node *get_remote_node(struct device_node *from, int reg)
232{
233 struct device_node *endpoint = NULL, *remote_node = NULL;
234
235 endpoint = of_graph_get_endpoint_by_regs(from, reg, -1);
236 if (!endpoint) {
237 DRM_ERROR("mic: Failed to find remote port from %s",
238 from->full_name);
239 goto exit;
240 }
241
242 remote_node = of_graph_get_remote_port_parent(endpoint);
243 if (!remote_node) {
244 DRM_ERROR("mic: Failed to find remote port parent from %s",
245 from->full_name);
246 goto exit;
247 }
248
249exit:
250 of_node_put(endpoint);
251 return remote_node;
252}
253
254static int parse_dt(struct exynos_mic *mic)
255{
256 int ret = 0, i, j;
257 struct device_node *remote_node;
258 struct device_node *nodes[3];
259
260 /*
261 * The order of endpoints does matter.
262 * The first node must be for decon and the second one must be for dsi.
263 */
264 for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) {
265 remote_node = get_remote_node(mic->dev->of_node, i);
266 if (!remote_node) {
267 ret = -EPIPE;
268 goto exit;
269 }
270 nodes[j++] = remote_node;
271
272 switch (i) {
273 case ENDPOINT_DECON_NODE:
274 /* decon node */
275 if (of_get_child_by_name(remote_node,
276 "i80-if-timings"))
277 mic->i80_mode = 1;
278
279 break;
280 case ENDPOINT_DSI_NODE:
281 /* panel node */
282 remote_node = get_remote_node(remote_node, 1);
283 if (!remote_node) {
284 ret = -EPIPE;
285 goto exit;
286 }
287 nodes[j++] = remote_node;
288
289 ret = of_get_videomode(remote_node,
290 &mic->vm, 0);
291 if (ret) {
292 DRM_ERROR("mic: failed to get videomode");
293 goto exit;
294 }
295
296 break;
297 default:
298 DRM_ERROR("mic: Unknown endpoint from MIC");
299 break;
300 }
301 }
302
303exit:
304 while (--j > -1)
305 of_node_put(nodes[j]);
306
307 return ret;
308}
309
310static void mic_disable(struct drm_bridge *bridge) { }
311
312static void mic_post_disable(struct drm_bridge *bridge)
313{
314 struct exynos_mic *mic = bridge->driver_private;
315 int i;
316
317 mutex_lock(&mic_mutex);
318 if (!mic->enabled)
319 goto already_disabled;
320
321 mic_set_path(mic, 0);
322
323 for (i = NUM_CLKS - 1; i > -1; i--)
324 clk_disable_unprepare(mic->clks[i]);
325
326 mic->enabled = 0;
327
328already_disabled:
329 mutex_unlock(&mic_mutex);
330}
331
332static void mic_pre_enable(struct drm_bridge *bridge)
333{
334 struct exynos_mic *mic = bridge->driver_private;
335 int ret, i;
336
337 mutex_lock(&mic_mutex);
338 if (mic->enabled)
339 goto already_enabled;
340
341 for (i = 0; i < NUM_CLKS; i++) {
342 ret = clk_prepare_enable(mic->clks[i]);
343 if (ret < 0) {
344 DRM_ERROR("Failed to enable clock (%s)\n",
345 clk_names[i]);
346 goto turn_off_clks;
347 }
348 }
349
350 mic_set_path(mic, 1);
351
352 ret = mic_sw_reset(mic);
353 if (ret) {
354 DRM_ERROR("Failed to reset\n");
355 goto turn_off_clks;
356 }
357
358 if (!mic->i80_mode)
359 mic_set_porch_timing(mic);
360 mic_set_img_size(mic);
361 mic_set_output_timing(mic);
362 mic_set_reg_on(mic, 1);
363 mic->enabled = 1;
364 mutex_unlock(&mic_mutex);
365
366 return;
367
368turn_off_clks:
369 while (--i > -1)
370 clk_disable_unprepare(mic->clks[i]);
371already_enabled:
372 mutex_unlock(&mic_mutex);
373}
374
375static void mic_enable(struct drm_bridge *bridge) { }
376
377static const struct drm_bridge_funcs mic_bridge_funcs = {
378 .disable = mic_disable,
379 .post_disable = mic_post_disable,
380 .pre_enable = mic_pre_enable,
381 .enable = mic_enable,
382};
383
384static int exynos_mic_bind(struct device *dev, struct device *master,
385 void *data)
386{
387 struct exynos_mic *mic = dev_get_drvdata(dev);
388 int ret;
389
390 mic->bridge.funcs = &mic_bridge_funcs;
391 mic->bridge.of_node = dev->of_node;
392 mic->bridge.driver_private = mic;
393 ret = drm_bridge_add(&mic->bridge);
394 if (ret)
395 DRM_ERROR("mic: Failed to add MIC to the global bridge list\n");
396
397 return ret;
398}
399
400static void exynos_mic_unbind(struct device *dev, struct device *master,
401 void *data)
402{
403 struct exynos_mic *mic = dev_get_drvdata(dev);
404 int i;
405
406 mutex_lock(&mic_mutex);
407 if (!mic->enabled)
408 goto already_disabled;
409
410 for (i = NUM_CLKS - 1; i > -1; i--)
411 clk_disable_unprepare(mic->clks[i]);
412
413already_disabled:
414 mutex_unlock(&mic_mutex);
415
416 drm_bridge_remove(&mic->bridge);
417}
418
419static const struct component_ops exynos_mic_component_ops = {
420 .bind = exynos_mic_bind,
421 .unbind = exynos_mic_unbind,
422};
423
424static int exynos_mic_probe(struct platform_device *pdev)
425{
426 struct device *dev = &pdev->dev;
427 struct exynos_mic *mic;
428 struct resource res;
429 int ret, i;
430
431 mic = devm_kzalloc(dev, sizeof(*mic), GFP_KERNEL);
432 if (!mic) {
433 DRM_ERROR("mic: Failed to allocate memory for MIC object\n");
434 ret = -ENOMEM;
435 goto err;
436 }
437
438 mic->dev = dev;
439
440 ret = parse_dt(mic);
441 if (ret)
442 goto err;
443
444 ret = of_address_to_resource(dev->of_node, 0, &res);
445 if (ret) {
446 DRM_ERROR("mic: Failed to get mem region for MIC\n");
447 goto err;
448 }
449 mic->reg = devm_ioremap(dev, res.start, resource_size(&res));
450 if (!mic->reg) {
451 DRM_ERROR("mic: Failed to remap for MIC\n");
452 ret = -ENOMEM;
453 goto err;
454 }
455
456 mic->sysreg = syscon_regmap_lookup_by_phandle(dev->of_node,
457 "samsung,disp-syscon");
458 if (IS_ERR(mic->sysreg)) {
459 DRM_ERROR("mic: Failed to get system register.\n");
460 ret = PTR_ERR(mic->sysreg);
461 goto err;
462 }
463
464 for (i = 0; i < NUM_CLKS; i++) {
465 mic->clks[i] = devm_clk_get(dev, clk_names[i]);
466 if (IS_ERR(mic->clks[i])) {
467 DRM_ERROR("mic: Failed to get clock (%s)\n",
468 clk_names[i]);
469 ret = PTR_ERR(mic->clks[i]);
470 goto err;
471 }
472 }
473
474 platform_set_drvdata(pdev, mic);
475
476 DRM_DEBUG_KMS("MIC has been probed\n");
477 return component_add(dev, &exynos_mic_component_ops);
478
479err:
480 return ret;
481}
482
483static int exynos_mic_remove(struct platform_device *pdev)
484{
485 component_del(&pdev->dev, &exynos_mic_component_ops);
486 return 0;
487}
488
489static const struct of_device_id exynos_mic_of_match[] = {
490 { .compatible = "samsung,exynos5433-mic" },
491 { }
492};
493MODULE_DEVICE_TABLE(of, exynos_mic_of_match);
494
495struct platform_driver mic_driver = {
496 .probe = exynos_mic_probe,
497 .remove = exynos_mic_remove,
498 .driver = {
499 .name = "exynos-mic",
500 .owner = THIS_MODULE,
501 .of_match_table = exynos_mic_of_match,
502 },
503};