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.h>
10 #include <linux/of_graph.h>
11 #include <linux/platform_device.h>
12 
13 #include <drm/drm_aperture.h>
14 #include <drm/drm_atomic_helper.h>
15 #include <drm/drm_drv.h>
16 #include <drm/drm_ioctl.h>
17 #include <drm/drm_managed.h>
18 #include <drm/drm_prime.h>
19 #include <drm/drm_probe_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 	.gem_prime_import	= armada_gem_prime_import,
41 	.dumb_create		= armada_gem_dumb_create,
42 	.major			= 1,
43 	.minor			= 0,
44 	.name			= "armada-drm",
45 	.desc			= "Armada SoC DRM",
46 	.date			= "20120730",
47 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
48 	.ioctls			= armada_ioctls,
49 	.num_ioctls = ARRAY_SIZE(armada_ioctls),
50 	.fops			= &armada_drm_fops,
51 };
52 
53 static const struct drm_mode_config_funcs armada_drm_mode_config_funcs = {
54 	.fb_create		= armada_fb_create,
55 	.atomic_check		= drm_atomic_helper_check,
56 	.atomic_commit		= drm_atomic_helper_commit,
57 };
58 
59 static int armada_drm_bind(struct device *dev)
60 {
61 	struct armada_private *priv;
62 	struct resource *mem = NULL;
63 	int ret, n;
64 
65 	for (n = 0; ; n++) {
66 		struct resource *r = platform_get_resource(to_platform_device(dev),
67 							   IORESOURCE_MEM, n);
68 		if (!r)
69 			break;
70 
71 		/* Resources above 64K are graphics memory */
72 		if (resource_size(r) > SZ_64K)
73 			mem = r;
74 		else
75 			return -EINVAL;
76 	}
77 
78 	if (!mem)
79 		return -ENXIO;
80 
81 	if (!devm_request_mem_region(dev, mem->start, resource_size(mem),
82 				     "armada-drm"))
83 		return -EBUSY;
84 
85 	priv = devm_drm_dev_alloc(dev, &armada_drm_driver,
86 				  struct armada_private, drm);
87 	if (IS_ERR(priv)) {
88 		dev_err(dev, "[" DRM_NAME ":%s] devm_drm_dev_alloc failed: %li\n",
89 			__func__, PTR_ERR(priv));
90 		return PTR_ERR(priv);
91 	}
92 
93 	/* Remove early framebuffers */
94 	ret = drm_aperture_remove_framebuffers(&armada_drm_driver);
95 	if (ret) {
96 		dev_err(dev, "[" DRM_NAME ":%s] can't kick out simple-fb: %d\n",
97 			__func__, ret);
98 		return ret;
99 	}
100 
101 	dev_set_drvdata(dev, &priv->drm);
102 
103 	/* Mode setting support */
104 	drm_mode_config_init(&priv->drm);
105 	priv->drm.mode_config.min_width = 320;
106 	priv->drm.mode_config.min_height = 200;
107 
108 	/*
109 	 * With vscale enabled, the maximum width is 1920 due to the
110 	 * 1920 by 3 lines RAM
111 	 */
112 	priv->drm.mode_config.max_width = 1920;
113 	priv->drm.mode_config.max_height = 2048;
114 
115 	priv->drm.mode_config.preferred_depth = 24;
116 	priv->drm.mode_config.funcs = &armada_drm_mode_config_funcs;
117 	drm_mm_init(&priv->linear, mem->start, resource_size(mem));
118 	mutex_init(&priv->linear_lock);
119 
120 	ret = component_bind_all(dev, &priv->drm);
121 	if (ret)
122 		goto err_kms;
123 
124 	ret = drm_vblank_init(&priv->drm, priv->drm.mode_config.num_crtc);
125 	if (ret)
126 		goto err_comp;
127 
128 	drm_mode_config_reset(&priv->drm);
129 
130 	drm_kms_helper_poll_init(&priv->drm);
131 
132 	ret = drm_dev_register(&priv->drm, 0);
133 	if (ret)
134 		goto err_poll;
135 
136 #ifdef CONFIG_DEBUG_FS
137 	armada_drm_debugfs_init(priv->drm.primary);
138 #endif
139 
140 	armada_fbdev_setup(&priv->drm);
141 
142 	return 0;
143 
144  err_poll:
145 	drm_kms_helper_poll_fini(&priv->drm);
146  err_comp:
147 	component_unbind_all(dev, &priv->drm);
148  err_kms:
149 	drm_mode_config_cleanup(&priv->drm);
150 	drm_mm_takedown(&priv->linear);
151 	return ret;
152 }
153 
154 static void armada_drm_unbind(struct device *dev)
155 {
156 	struct drm_device *drm = dev_get_drvdata(dev);
157 	struct armada_private *priv = drm_to_armada_dev(drm);
158 
159 	drm_kms_helper_poll_fini(&priv->drm);
160 
161 	drm_dev_unregister(&priv->drm);
162 
163 	drm_atomic_helper_shutdown(&priv->drm);
164 
165 	component_unbind_all(dev, &priv->drm);
166 
167 	drm_mode_config_cleanup(&priv->drm);
168 	drm_mm_takedown(&priv->linear);
169 }
170 
171 static void armada_add_endpoints(struct device *dev,
172 	struct component_match **match, struct device_node *dev_node)
173 {
174 	struct device_node *ep, *remote;
175 
176 	for_each_endpoint_of_node(dev_node, ep) {
177 		remote = of_graph_get_remote_port_parent(ep);
178 		if (remote && of_device_is_available(remote))
179 			drm_of_component_match_add(dev, match, component_compare_of,
180 						   remote);
181 		of_node_put(remote);
182 	}
183 }
184 
185 static const struct component_master_ops armada_master_ops = {
186 	.bind = armada_drm_bind,
187 	.unbind = armada_drm_unbind,
188 };
189 
190 static int armada_drm_probe(struct platform_device *pdev)
191 {
192 	struct component_match *match = NULL;
193 	struct device *dev = &pdev->dev;
194 	int ret;
195 
196 	ret = drm_of_component_probe(dev, component_compare_dev_name, &armada_master_ops);
197 	if (ret != -EINVAL)
198 		return ret;
199 
200 	if (dev->platform_data) {
201 		char **devices = dev->platform_data;
202 		struct device *d;
203 		int i;
204 
205 		for (i = 0; devices[i]; i++)
206 			component_match_add(dev, &match, component_compare_dev_name,
207 					    devices[i]);
208 
209 		if (i == 0) {
210 			dev_err(dev, "missing 'ports' property\n");
211 			return -ENODEV;
212 		}
213 
214 		for (i = 0; devices[i]; i++) {
215 			d = bus_find_device_by_name(&platform_bus_type, NULL,
216 						    devices[i]);
217 			if (d && d->of_node)
218 				armada_add_endpoints(dev, &match, d->of_node);
219 			put_device(d);
220 		}
221 	}
222 
223 	return component_master_add_with_match(&pdev->dev, &armada_master_ops,
224 					       match);
225 }
226 
227 static int armada_drm_remove(struct platform_device *pdev)
228 {
229 	component_master_del(&pdev->dev, &armada_master_ops);
230 	return 0;
231 }
232 
233 static const struct platform_device_id armada_drm_platform_ids[] = {
234 	{
235 		.name		= "armada-drm",
236 	}, {
237 		.name		= "armada-510-drm",
238 	},
239 	{ },
240 };
241 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
242 
243 static struct platform_driver armada_drm_platform_driver = {
244 	.probe	= armada_drm_probe,
245 	.remove	= armada_drm_remove,
246 	.driver	= {
247 		.name	= "armada-drm",
248 	},
249 	.id_table = armada_drm_platform_ids,
250 };
251 
252 static int __init armada_drm_init(void)
253 {
254 	int ret;
255 
256 	if (drm_firmware_drivers_only())
257 		return -ENODEV;
258 
259 	ret = platform_driver_register(&armada_lcd_platform_driver);
260 	if (ret)
261 		return ret;
262 	ret = platform_driver_register(&armada_drm_platform_driver);
263 	if (ret)
264 		platform_driver_unregister(&armada_lcd_platform_driver);
265 	return ret;
266 }
267 module_init(armada_drm_init);
268 
269 static void __exit armada_drm_exit(void)
270 {
271 	platform_driver_unregister(&armada_drm_platform_driver);
272 	platform_driver_unregister(&armada_lcd_platform_driver);
273 }
274 module_exit(armada_drm_exit);
275 
276 MODULE_AUTHOR("Russell King <rmk+kernel@armlinux.org.uk>");
277 MODULE_DESCRIPTION("Armada DRM Driver");
278 MODULE_LICENSE("GPL");
279 MODULE_ALIAS("platform:armada-drm");
280