1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Hisilicon Kirin SoCs drm master driver
4  *
5  * Copyright (c) 2016 Linaro Limited.
6  * Copyright (c) 2014-2016 Hisilicon Limited.
7  *
8  * Author:
9  *	Xinliang Liu <z.liuxinliang@hisilicon.com>
10  *	Xinliang Liu <xinliang.liu@linaro.org>
11  *	Xinwei Kong <kong.kongxinwei@hisilicon.com>
12  */
13 
14 #include <linux/of_platform.h>
15 #include <linux/component.h>
16 #include <linux/module.h>
17 #include <linux/of_graph.h>
18 #include <linux/platform_device.h>
19 
20 #include <drm/drm_atomic_helper.h>
21 #include <drm/drm_drv.h>
22 #include <drm/drm_fb_cma_helper.h>
23 #include <drm/drm_fb_helper.h>
24 #include <drm/drm_gem_cma_helper.h>
25 #include <drm/drm_gem_framebuffer_helper.h>
26 #include <drm/drm_of.h>
27 #include <drm/drm_probe_helper.h>
28 #include <drm/drm_vblank.h>
29 
30 #include "kirin_drm_drv.h"
31 
32 #define KIRIN_MAX_PLANE	2
33 
34 struct kirin_drm_private {
35 	struct kirin_crtc crtc;
36 	struct kirin_plane planes[KIRIN_MAX_PLANE];
37 	void *hw_ctx;
38 };
39 
40 static int kirin_drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
41 			       struct drm_plane *plane,
42 			       const struct kirin_drm_data *driver_data)
43 {
44 	struct device_node *port;
45 	int ret;
46 
47 	/* set crtc port so that
48 	 * drm_of_find_possible_crtcs call works
49 	 */
50 	port = of_get_child_by_name(dev->dev->of_node, "port");
51 	if (!port) {
52 		DRM_ERROR("no port node found in %pOF\n", dev->dev->of_node);
53 		return -EINVAL;
54 	}
55 	of_node_put(port);
56 	crtc->port = port;
57 
58 	ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
59 					driver_data->crtc_funcs, NULL);
60 	if (ret) {
61 		DRM_ERROR("failed to init crtc.\n");
62 		return ret;
63 	}
64 
65 	drm_crtc_helper_add(crtc, driver_data->crtc_helper_funcs);
66 
67 	return 0;
68 }
69 
70 static int kirin_drm_plane_init(struct drm_device *dev, struct drm_plane *plane,
71 				enum drm_plane_type type,
72 				const struct kirin_drm_data *data)
73 {
74 	int ret = 0;
75 
76 	ret = drm_universal_plane_init(dev, plane, 1, data->plane_funcs,
77 				       data->channel_formats,
78 				       data->channel_formats_cnt,
79 				       NULL, type, NULL);
80 	if (ret) {
81 		DRM_ERROR("fail to init plane, ch=%d\n", 0);
82 		return ret;
83 	}
84 
85 	drm_plane_helper_add(plane, data->plane_helper_funcs);
86 
87 	return 0;
88 }
89 
90 static void kirin_drm_private_cleanup(struct drm_device *dev)
91 {
92 	struct kirin_drm_private *kirin_priv = dev->dev_private;
93 	struct kirin_drm_data *data;
94 
95 	data = (struct kirin_drm_data *)of_device_get_match_data(dev->dev);
96 	if (data->cleanup_hw_ctx)
97 		data->cleanup_hw_ctx(kirin_priv->hw_ctx);
98 
99 	devm_kfree(dev->dev, kirin_priv);
100 	dev->dev_private = NULL;
101 }
102 
103 static int kirin_drm_private_init(struct drm_device *dev,
104 				  const struct kirin_drm_data *driver_data)
105 {
106 	struct platform_device *pdev = to_platform_device(dev->dev);
107 	struct kirin_drm_private *kirin_priv;
108 	struct drm_plane *prim_plane;
109 	enum drm_plane_type type;
110 	void *ctx;
111 	int ret;
112 	u32 ch;
113 
114 	kirin_priv = devm_kzalloc(dev->dev, sizeof(*kirin_priv), GFP_KERNEL);
115 	if (!kirin_priv) {
116 		DRM_ERROR("failed to alloc kirin_drm_private\n");
117 		return -ENOMEM;
118 	}
119 
120 	ctx = driver_data->alloc_hw_ctx(pdev, &kirin_priv->crtc.base);
121 	if (IS_ERR(ctx)) {
122 		DRM_ERROR("failed to initialize kirin_priv hw ctx\n");
123 		return -EINVAL;
124 	}
125 	kirin_priv->hw_ctx = ctx;
126 
127 	/*
128 	 * plane init
129 	 * TODO: Now only support primary plane, overlay planes
130 	 * need to do.
131 	 */
132 	for (ch = 0; ch < driver_data->num_planes; ch++) {
133 		if (ch == driver_data->prim_plane)
134 			type = DRM_PLANE_TYPE_PRIMARY;
135 		else
136 			type = DRM_PLANE_TYPE_OVERLAY;
137 		ret = kirin_drm_plane_init(dev, &kirin_priv->planes[ch].base,
138 					   type, driver_data);
139 		if (ret)
140 			return ret;
141 		kirin_priv->planes[ch].ch = ch;
142 		kirin_priv->planes[ch].hw_ctx = ctx;
143 	}
144 
145 	/* crtc init */
146 	prim_plane = &kirin_priv->planes[driver_data->prim_plane].base;
147 	ret = kirin_drm_crtc_init(dev, &kirin_priv->crtc.base,
148 				  prim_plane, driver_data);
149 	if (ret)
150 		return ret;
151 	kirin_priv->crtc.hw_ctx = ctx;
152 	dev->dev_private = kirin_priv;
153 
154 	return 0;
155 }
156 
157 static int kirin_drm_kms_init(struct drm_device *dev,
158 			      const struct kirin_drm_data *driver_data)
159 {
160 	int ret;
161 
162 	/* dev->mode_config initialization */
163 	drm_mode_config_init(dev);
164 	dev->mode_config.min_width = 0;
165 	dev->mode_config.min_height = 0;
166 	dev->mode_config.max_width = driver_data->config_max_width;
167 	dev->mode_config.max_height = driver_data->config_max_width;
168 	dev->mode_config.funcs = driver_data->mode_config_funcs;
169 
170 	/* display controller init */
171 	ret = kirin_drm_private_init(dev, driver_data);
172 	if (ret)
173 		goto err_mode_config_cleanup;
174 
175 	/* bind and init sub drivers */
176 	ret = component_bind_all(dev->dev, dev);
177 	if (ret) {
178 		DRM_ERROR("failed to bind all component.\n");
179 		goto err_private_cleanup;
180 	}
181 
182 	/* vblank init */
183 	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
184 	if (ret) {
185 		DRM_ERROR("failed to initialize vblank.\n");
186 		goto err_unbind_all;
187 	}
188 	/* with irq_enabled = true, we can use the vblank feature. */
189 	dev->irq_enabled = true;
190 
191 	/* reset all the states of crtc/plane/encoder/connector */
192 	drm_mode_config_reset(dev);
193 
194 	/* init kms poll for handling hpd */
195 	drm_kms_helper_poll_init(dev);
196 
197 	return 0;
198 
199 err_unbind_all:
200 	component_unbind_all(dev->dev, dev);
201 err_private_cleanup:
202 	kirin_drm_private_cleanup(dev);
203 err_mode_config_cleanup:
204 	drm_mode_config_cleanup(dev);
205 	return ret;
206 }
207 
208 static int compare_of(struct device *dev, void *data)
209 {
210 	return dev->of_node == data;
211 }
212 
213 static int kirin_drm_kms_cleanup(struct drm_device *dev)
214 {
215 	drm_kms_helper_poll_fini(dev);
216 	kirin_drm_private_cleanup(dev);
217 	drm_mode_config_cleanup(dev);
218 
219 	return 0;
220 }
221 
222 static int kirin_drm_connectors_register(struct drm_device *dev)
223 {
224 	struct drm_connector *connector;
225 	struct drm_connector *failed_connector;
226 	struct drm_connector_list_iter conn_iter;
227 	int ret;
228 
229 	mutex_lock(&dev->mode_config.mutex);
230 	drm_connector_list_iter_begin(dev, &conn_iter);
231 	drm_for_each_connector_iter(connector, &conn_iter) {
232 		ret = drm_connector_register(connector);
233 		if (ret) {
234 			failed_connector = connector;
235 			goto err;
236 		}
237 	}
238 	drm_connector_list_iter_end(&conn_iter);
239 	mutex_unlock(&dev->mode_config.mutex);
240 
241 	return 0;
242 
243 err:
244 	drm_connector_list_iter_begin(dev, &conn_iter);
245 	drm_for_each_connector_iter(connector, &conn_iter) {
246 		if (failed_connector == connector)
247 			break;
248 		drm_connector_unregister(connector);
249 	}
250 	drm_connector_list_iter_end(&conn_iter);
251 	mutex_unlock(&dev->mode_config.mutex);
252 
253 	return ret;
254 }
255 
256 static int kirin_drm_bind(struct device *dev)
257 {
258 	struct kirin_drm_data *driver_data;
259 	struct drm_device *drm_dev;
260 	int ret;
261 
262 	driver_data = (struct kirin_drm_data *)of_device_get_match_data(dev);
263 	if (!driver_data)
264 		return -EINVAL;
265 
266 	drm_dev = drm_dev_alloc(driver_data->driver, dev);
267 	if (IS_ERR(drm_dev))
268 		return PTR_ERR(drm_dev);
269 	dev_set_drvdata(dev, drm_dev);
270 
271 	/* display controller init */
272 	ret = kirin_drm_kms_init(drm_dev, driver_data);
273 	if (ret)
274 		goto err_drm_dev_put;
275 
276 	ret = drm_dev_register(drm_dev, 0);
277 	if (ret)
278 		goto err_kms_cleanup;
279 
280 	drm_fbdev_generic_setup(drm_dev, 32);
281 
282 	/* connectors should be registered after drm device register */
283 	if (driver_data->register_connects) {
284 		ret = kirin_drm_connectors_register(drm_dev);
285 		if (ret)
286 			goto err_drm_dev_unregister;
287 	}
288 
289 	return 0;
290 
291 err_drm_dev_unregister:
292 	drm_dev_unregister(drm_dev);
293 err_kms_cleanup:
294 	kirin_drm_kms_cleanup(drm_dev);
295 err_drm_dev_put:
296 	drm_dev_put(drm_dev);
297 
298 	return ret;
299 }
300 
301 static void kirin_drm_unbind(struct device *dev)
302 {
303 	struct drm_device *drm_dev = dev_get_drvdata(dev);
304 
305 	drm_dev_unregister(drm_dev);
306 	kirin_drm_kms_cleanup(drm_dev);
307 	drm_dev_put(drm_dev);
308 }
309 
310 static const struct component_master_ops kirin_drm_ops = {
311 	.bind = kirin_drm_bind,
312 	.unbind = kirin_drm_unbind,
313 };
314 
315 static int kirin_drm_platform_probe(struct platform_device *pdev)
316 {
317 	struct device *dev = &pdev->dev;
318 	struct device_node *np = dev->of_node;
319 	struct component_match *match = NULL;
320 	struct device_node *remote;
321 
322 	remote = of_graph_get_remote_node(np, 0, 0);
323 	if (!remote)
324 		return -ENODEV;
325 
326 	drm_of_component_match_add(dev, &match, compare_of, remote);
327 	of_node_put(remote);
328 
329 	return component_master_add_with_match(dev, &kirin_drm_ops, match);
330 }
331 
332 static int kirin_drm_platform_remove(struct platform_device *pdev)
333 {
334 	component_master_del(&pdev->dev, &kirin_drm_ops);
335 	return 0;
336 }
337 
338 static const struct of_device_id kirin_drm_dt_ids[] = {
339 	{ .compatible = "hisilicon,hi6220-ade",
340 	  .data = &ade_driver_data,
341 	},
342 	{ /* end node */ },
343 };
344 MODULE_DEVICE_TABLE(of, kirin_drm_dt_ids);
345 
346 static struct platform_driver kirin_drm_platform_driver = {
347 	.probe = kirin_drm_platform_probe,
348 	.remove = kirin_drm_platform_remove,
349 	.driver = {
350 		.name = "kirin-drm",
351 		.of_match_table = kirin_drm_dt_ids,
352 	},
353 };
354 
355 module_platform_driver(kirin_drm_platform_driver);
356 
357 MODULE_AUTHOR("Xinliang Liu <xinliang.liu@linaro.org>");
358 MODULE_AUTHOR("Xinliang Liu <z.liuxinliang@hisilicon.com>");
359 MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
360 MODULE_DESCRIPTION("hisilicon Kirin SoCs' DRM master driver");
361 MODULE_LICENSE("GPL v2");
362