1/*
  2 * Samsung SoC DP (Display Port) interface driver.
  3 *
  4 * Copyright (C) 2012 Samsung Electronics Co., Ltd.
  5 * Author: Jingoo Han <jg1.han@samsung.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify it
  8 * under the terms of the GNU General Public License as published by the
  9 * Free Software Foundation; either version 2 of the License, or (at your
 10 * option) any later version.
 11 */
 12
 13#include <linux/module.h>
 14#include <linux/platform_device.h>
 15#include <linux/err.h>
 16#include <linux/clk.h>
 17#include <linux/of_graph.h>
 18#include <linux/component.h>
 19#include <video/of_display_timing.h>
 20#include <video/of_videomode.h>
 21#include <video/videomode.h>
 22
 23#include <drm/drmP.h>
 24#include <drm/drm_crtc.h>
 25#include <drm/drm_crtc_helper.h>
 26#include <drm/drm_panel.h>
 27
 28#include <drm/bridge/analogix_dp.h>
 29#include <drm/exynos_drm.h>
 30
 31#include "exynos_drm_crtc.h"
 32
 33#define to_dp(nm)	container_of(nm, struct exynos_dp_device, nm)
 34
 35struct exynos_dp_device {
 36	struct drm_encoder         encoder;
 37	struct drm_connector       *connector;
 38	struct drm_bridge          *ptn_bridge;
 39	struct drm_device          *drm_dev;
 40	struct device              *dev;
 41
 42	struct videomode           vm;
 43	struct analogix_dp_plat_data plat_data;
 44};
 45
 46static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
 47				bool enable)
 48{
 49	struct exynos_dp_device *dp = to_dp(plat_data);
 50	struct drm_encoder *encoder = &dp->encoder;
 51
 52	if (!encoder->crtc)
 53		return -EPERM;
 54
 55	exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);
 56
 57	return 0;
 58}
 59
 60static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
 61{
 62	return exynos_dp_crtc_clock_enable(plat_data, true);
 63}
 64
 65static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
 66{
 67	return exynos_dp_crtc_clock_enable(plat_data, false);
 68}
 69
 70static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
 71			       struct drm_connector *connector)
 72{
 73	struct exynos_dp_device *dp = to_dp(plat_data);
 74	struct drm_display_mode *mode;
 75	int num_modes = 0;
 76
 77	if (dp->plat_data.panel)
 78		return num_modes;
 79
 80	mode = drm_mode_create(connector->dev);
 81	if (!mode) {
 82		DRM_ERROR("failed to create a new display mode.\n");
 83		return num_modes;
 84	}
 85
 86	drm_display_mode_from_videomode(&dp->vm, mode);
 87	connector->display_info.width_mm = mode->width_mm;
 88	connector->display_info.height_mm = mode->height_mm;
 89
 90	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 91	drm_mode_set_name(mode);
 92	drm_mode_probed_add(connector, mode);
 93
 94	return num_modes + 1;
 95}
 96
 97static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
 98				   struct drm_bridge *bridge,
 99				   struct drm_connector *connector)
100{
101	struct exynos_dp_device *dp = to_dp(plat_data);
102	struct drm_encoder *encoder = &dp->encoder;
103	int ret;
104
105	drm_connector_register(connector);
106	dp->connector = connector;
107
108	/* Pre-empt DP connector creation if there's a bridge */
109	if (dp->ptn_bridge) {
110		bridge->next = dp->ptn_bridge;
111		dp->ptn_bridge->encoder = encoder;
112		ret = drm_bridge_attach(encoder->dev, dp->ptn_bridge);
113		if (ret) {
114			DRM_ERROR("Failed to attach bridge to drm\n");
115			bridge->next = NULL;
116			return ret;
117		}
118	}
119
120	return 0;
121}
122
123static void exynos_dp_mode_set(struct drm_encoder *encoder,
124			       struct drm_display_mode *mode,
125			       struct drm_display_mode *adjusted_mode)
126{
127}
128
129static void exynos_dp_nop(struct drm_encoder *encoder)
130{
131	/* do nothing */
132}
133
134static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
135	.mode_set = exynos_dp_mode_set,
136	.enable = exynos_dp_nop,
137	.disable = exynos_dp_nop,
138};
139
140static const struct drm_encoder_funcs exynos_dp_encoder_funcs = {
141	.destroy = drm_encoder_cleanup,
142};
143
144static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
145{
146	int ret;
147
148	ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
149	if (ret) {
150		DRM_ERROR("failed: of_get_videomode() : %d\n", ret);
151		return ret;
152	}
153	return 0;
154}
155
156static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
157{
158	struct exynos_dp_device *dp = dev_get_drvdata(dev);
159	struct drm_encoder *encoder = &dp->encoder;
160	struct drm_device *drm_dev = data;
161	int pipe, ret;
162
163	/*
164	 * Just like the probe function said, we don't need the
165	 * device drvrate anymore, we should leave the charge to
166	 * analogix dp driver, set the device drvdata to NULL.
167	 */
168	dev_set_drvdata(dev, NULL);
169
170	dp->dev = dev;
171	dp->drm_dev = drm_dev;
172
173	dp->plat_data.dev_type = EXYNOS_DP;
174	dp->plat_data.power_on = exynos_dp_poweron;
175	dp->plat_data.power_off = exynos_dp_poweroff;
176	dp->plat_data.attach = exynos_dp_bridge_attach;
177	dp->plat_data.get_modes = exynos_dp_get_modes;
178
179	if (!dp->plat_data.panel && !dp->ptn_bridge) {
180		ret = exynos_dp_dt_parse_panel(dp);
181		if (ret)
182			return ret;
183	}
184
185	pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
186						  EXYNOS_DISPLAY_TYPE_LCD);
187	if (pipe < 0)
188		return pipe;
189
190	encoder->possible_crtcs = 1 << pipe;
191
192	DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
193
194	drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs,
195			 DRM_MODE_ENCODER_TMDS, NULL);
196
197	drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
198
199	dp->plat_data.encoder = encoder;
200
201	return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
202}
203
204static void exynos_dp_unbind(struct device *dev, struct device *master,
205			     void *data)
206{
207	return analogix_dp_unbind(dev, master, data);
208}
209
210static const struct component_ops exynos_dp_ops = {
211	.bind	= exynos_dp_bind,
212	.unbind	= exynos_dp_unbind,
213};
214
215static int exynos_dp_probe(struct platform_device *pdev)
216{
217	struct device *dev = &pdev->dev;
218	struct device_node *np = NULL, *endpoint = NULL;
219	struct exynos_dp_device *dp;
220
221	dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
222			  GFP_KERNEL);
223	if (!dp)
224		return -ENOMEM;
225
226	/*
227	 * We just use the drvdata until driver run into component
228	 * add function, and then we would set drvdata to null, so
229	 * that analogix dp driver would take charge of the drvdata.
230	 */
231	platform_set_drvdata(pdev, dp);
232
233	/* This is for the backward compatibility. */
234	np = of_parse_phandle(dev->of_node, "panel", 0);
235	if (np) {
236		dp->plat_data.panel = of_drm_find_panel(np);
237		of_node_put(np);
238		if (!dp->plat_data.panel)
239			return -EPROBE_DEFER;
240		goto out;
241	}
242
243	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
244	if (endpoint) {
245		np = of_graph_get_remote_port_parent(endpoint);
246		if (np) {
247			/* The remote port can be either a panel or a bridge */
248			dp->plat_data.panel = of_drm_find_panel(np);
249			if (!dp->plat_data.panel) {
250				dp->ptn_bridge = of_drm_find_bridge(np);
251				if (!dp->ptn_bridge) {
252					of_node_put(np);
253					return -EPROBE_DEFER;
254				}
255			}
256			of_node_put(np);
257		} else {
258			DRM_ERROR("no remote endpoint device node found.\n");
259			return -EINVAL;
260		}
261	} else {
262		DRM_ERROR("no port endpoint subnode found.\n");
263		return -EINVAL;
264	}
265
266out:
267	return component_add(&pdev->dev, &exynos_dp_ops);
268}
269
270static int exynos_dp_remove(struct platform_device *pdev)
271{
272	component_del(&pdev->dev, &exynos_dp_ops);
273
274	return 0;
275}
276
277#ifdef CONFIG_PM
278static int exynos_dp_suspend(struct device *dev)
279{
280	return analogix_dp_suspend(dev);
281}
282
283static int exynos_dp_resume(struct device *dev)
284{
285	return analogix_dp_resume(dev);
286}
287#endif
288
289static const struct dev_pm_ops exynos_dp_pm_ops = {
290	SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
291};
292
293static const struct of_device_id exynos_dp_match[] = {
294	{ .compatible = "samsung,exynos5-dp" },
295	{},
296};
297MODULE_DEVICE_TABLE(of, exynos_dp_match);
298
299struct platform_driver dp_driver = {
300	.probe		= exynos_dp_probe,
301	.remove		= exynos_dp_remove,
302	.driver		= {
303		.name	= "exynos-dp",
304		.owner	= THIS_MODULE,
305		.pm	= &exynos_dp_pm_ops,
306		.of_match_table = exynos_dp_match,
307	},
308};
309
310MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
311MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
312MODULE_LICENSE("GPL v2");