armada_drv.c

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