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