1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2012 Russell King
4  */
5 
6 #include <linux/clk.h>
7 #include <linux/component.h>
8 #include <linux/module.h>
9 #include <linux/of_graph.h>
10 #include <linux/platform_device.h>
11 
12 #include <drm/drm_atomic_helper.h>
13 #include <drm/drm_drv.h>
14 #include <drm/drm_ioctl.h>
15 #include <drm/drm_managed.h>
16 #include <drm/drm_prime.h>
17 #include <drm/drm_probe_helper.h>
18 #include <drm/drm_fb_helper.h>
19 #include <drm/drm_of.h>
20 #include <drm/drm_vblank.h>
21 
22 #include "armada_crtc.h"
23 #include "armada_drm.h"
24 #include "armada_gem.h"
25 #include "armada_fb.h"
26 #include "armada_hw.h"
27 #include <drm/armada_drm.h>
28 #include "armada_ioctlP.h"
29 
30 static struct drm_ioctl_desc armada_ioctls[] = {
31 	DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0),
32 	DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
33 	DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
34 };
35 
36 DEFINE_DRM_GEM_FOPS(armada_drm_fops);
37 
38 static struct drm_driver armada_drm_driver = {
39 	.lastclose		= drm_fb_helper_lastclose,
40 	.gem_free_object_unlocked = armada_gem_free_object,
41 	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
42 	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
43 	.gem_prime_export	= armada_gem_prime_export,
44 	.gem_prime_import	= armada_gem_prime_import,
45 	.dumb_create		= armada_gem_dumb_create,
46 	.gem_vm_ops		= &armada_gem_vm_ops,
47 	.major			= 1,
48 	.minor			= 0,
49 	.name			= "armada-drm",
50 	.desc			= "Armada SoC DRM",
51 	.date			= "20120730",
52 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
53 	.ioctls			= armada_ioctls,
54 	.fops			= &armada_drm_fops,
55 };
56 
57 static const struct drm_mode_config_funcs armada_drm_mode_config_funcs = {
58 	.fb_create		= armada_fb_create,
59 	.output_poll_changed	= drm_fb_helper_output_poll_changed,
60 	.atomic_check		= drm_atomic_helper_check,
61 	.atomic_commit		= drm_atomic_helper_commit,
62 };
63 
64 static int armada_drm_bind(struct device *dev)
65 {
66 	struct armada_private *priv;
67 	struct resource *mem = NULL;
68 	int ret, n;
69 
70 	for (n = 0; ; n++) {
71 		struct resource *r = platform_get_resource(to_platform_device(dev),
72 							   IORESOURCE_MEM, n);
73 		if (!r)
74 			break;
75 
76 		/* Resources above 64K are graphics memory */
77 		if (resource_size(r) > SZ_64K)
78 			mem = r;
79 		else
80 			return -EINVAL;
81 	}
82 
83 	if (!mem)
84 		return -ENXIO;
85 
86 	if (!devm_request_mem_region(dev, mem->start, resource_size(mem),
87 				     "armada-drm"))
88 		return -EBUSY;
89 
90 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
91 	if (!priv)
92 		return -ENOMEM;
93 
94 	/*
95 	 * The drm_device structure must be at the start of
96 	 * armada_private for drm_dev_put() to work correctly.
97 	 */
98 	BUILD_BUG_ON(offsetof(struct armada_private, drm) != 0);
99 
100 	ret = drm_dev_init(&priv->drm, &armada_drm_driver, dev);
101 	if (ret) {
102 		dev_err(dev, "[" DRM_NAME ":%s] drm_dev_init failed: %d\n",
103 			__func__, ret);
104 		kfree(priv);
105 		return ret;
106 	}
107 	drmm_add_final_kfree(&priv->drm, priv);
108 
109 	/* Remove early framebuffers */
110 	ret = drm_fb_helper_remove_conflicting_framebuffers(NULL,
111 							    "armada-drm-fb",
112 							    false);
113 	if (ret) {
114 		dev_err(dev, "[" DRM_NAME ":%s] can't kick out simple-fb: %d\n",
115 			__func__, ret);
116 		kfree(priv);
117 		return ret;
118 	}
119 
120 	priv->drm.dev_private = priv;
121 
122 	dev_set_drvdata(dev, &priv->drm);
123 
124 	/* Mode setting support */
125 	drm_mode_config_init(&priv->drm);
126 	priv->drm.mode_config.min_width = 320;
127 	priv->drm.mode_config.min_height = 200;
128 
129 	/*
130 	 * With vscale enabled, the maximum width is 1920 due to the
131 	 * 1920 by 3 lines RAM
132 	 */
133 	priv->drm.mode_config.max_width = 1920;
134 	priv->drm.mode_config.max_height = 2048;
135 
136 	priv->drm.mode_config.preferred_depth = 24;
137 	priv->drm.mode_config.funcs = &armada_drm_mode_config_funcs;
138 	drm_mm_init(&priv->linear, mem->start, resource_size(mem));
139 	mutex_init(&priv->linear_lock);
140 
141 	ret = component_bind_all(dev, &priv->drm);
142 	if (ret)
143 		goto err_kms;
144 
145 	ret = drm_vblank_init(&priv->drm, priv->drm.mode_config.num_crtc);
146 	if (ret)
147 		goto err_comp;
148 
149 	priv->drm.irq_enabled = true;
150 
151 	drm_mode_config_reset(&priv->drm);
152 
153 	ret = armada_fbdev_init(&priv->drm);
154 	if (ret)
155 		goto err_comp;
156 
157 	drm_kms_helper_poll_init(&priv->drm);
158 
159 	ret = drm_dev_register(&priv->drm, 0);
160 	if (ret)
161 		goto err_poll;
162 
163 #ifdef CONFIG_DEBUG_FS
164 	armada_drm_debugfs_init(priv->drm.primary);
165 #endif
166 
167 	return 0;
168 
169  err_poll:
170 	drm_kms_helper_poll_fini(&priv->drm);
171 	armada_fbdev_fini(&priv->drm);
172  err_comp:
173 	component_unbind_all(dev, &priv->drm);
174  err_kms:
175 	drm_mode_config_cleanup(&priv->drm);
176 	drm_mm_takedown(&priv->linear);
177 	drm_dev_put(&priv->drm);
178 	return ret;
179 }
180 
181 static void armada_drm_unbind(struct device *dev)
182 {
183 	struct drm_device *drm = dev_get_drvdata(dev);
184 	struct armada_private *priv = drm->dev_private;
185 
186 	drm_kms_helper_poll_fini(&priv->drm);
187 	armada_fbdev_fini(&priv->drm);
188 
189 	drm_dev_unregister(&priv->drm);
190 
191 	drm_atomic_helper_shutdown(&priv->drm);
192 
193 	component_unbind_all(dev, &priv->drm);
194 
195 	drm_mode_config_cleanup(&priv->drm);
196 	drm_mm_takedown(&priv->linear);
197 
198 	drm_dev_put(&priv->drm);
199 }
200 
201 static int compare_of(struct device *dev, void *data)
202 {
203 	return dev->of_node == data;
204 }
205 
206 static int compare_dev_name(struct device *dev, void *data)
207 {
208 	const char *name = data;
209 	return !strcmp(dev_name(dev), name);
210 }
211 
212 static void armada_add_endpoints(struct device *dev,
213 	struct component_match **match, struct device_node *dev_node)
214 {
215 	struct device_node *ep, *remote;
216 
217 	for_each_endpoint_of_node(dev_node, ep) {
218 		remote = of_graph_get_remote_port_parent(ep);
219 		if (remote && of_device_is_available(remote))
220 			drm_of_component_match_add(dev, match, compare_of,
221 						   remote);
222 		of_node_put(remote);
223 	}
224 }
225 
226 static const struct component_master_ops armada_master_ops = {
227 	.bind = armada_drm_bind,
228 	.unbind = armada_drm_unbind,
229 };
230 
231 static int armada_drm_probe(struct platform_device *pdev)
232 {
233 	struct component_match *match = NULL;
234 	struct device *dev = &pdev->dev;
235 	int ret;
236 
237 	ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
238 	if (ret != -EINVAL)
239 		return ret;
240 
241 	if (dev->platform_data) {
242 		char **devices = dev->platform_data;
243 		struct device *d;
244 		int i;
245 
246 		for (i = 0; devices[i]; i++)
247 			component_match_add(dev, &match, compare_dev_name,
248 					    devices[i]);
249 
250 		if (i == 0) {
251 			dev_err(dev, "missing 'ports' property\n");
252 			return -ENODEV;
253 		}
254 
255 		for (i = 0; devices[i]; i++) {
256 			d = bus_find_device_by_name(&platform_bus_type, NULL,
257 						    devices[i]);
258 			if (d && d->of_node)
259 				armada_add_endpoints(dev, &match, d->of_node);
260 			put_device(d);
261 		}
262 	}
263 
264 	return component_master_add_with_match(&pdev->dev, &armada_master_ops,
265 					       match);
266 }
267 
268 static int armada_drm_remove(struct platform_device *pdev)
269 {
270 	component_master_del(&pdev->dev, &armada_master_ops);
271 	return 0;
272 }
273 
274 static const struct platform_device_id armada_drm_platform_ids[] = {
275 	{
276 		.name		= "armada-drm",
277 	}, {
278 		.name		= "armada-510-drm",
279 	},
280 	{ },
281 };
282 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
283 
284 static struct platform_driver armada_drm_platform_driver = {
285 	.probe	= armada_drm_probe,
286 	.remove	= armada_drm_remove,
287 	.driver	= {
288 		.name	= "armada-drm",
289 	},
290 	.id_table = armada_drm_platform_ids,
291 };
292 
293 static int __init armada_drm_init(void)
294 {
295 	int ret;
296 
297 	armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
298 
299 	ret = platform_driver_register(&armada_lcd_platform_driver);
300 	if (ret)
301 		return ret;
302 	ret = platform_driver_register(&armada_drm_platform_driver);
303 	if (ret)
304 		platform_driver_unregister(&armada_lcd_platform_driver);
305 	return ret;
306 }
307 module_init(armada_drm_init);
308 
309 static void __exit armada_drm_exit(void)
310 {
311 	platform_driver_unregister(&armada_drm_platform_driver);
312 	platform_driver_unregister(&armada_lcd_platform_driver);
313 }
314 module_exit(armada_drm_exit);
315 
316 MODULE_AUTHOR("Russell King <rmk+kernel@armlinux.org.uk>");
317 MODULE_DESCRIPTION("Armada DRM Driver");
318 MODULE_LICENSE("GPL");
319 MODULE_ALIAS("platform:armada-drm");
320