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