1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) STMicroelectronics SA 2014
  4 * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
  5 */
  6
  7#include <linux/component.h>
  8#include <linux/dma-mapping.h>
  9#include <linux/kernel.h>
 10#include <linux/module.h>
 11#include <linux/of_platform.h>
 12
 13#include <drm/drm_atomic.h>
 14#include <drm/drm_atomic_helper.h>
 15#include <drm/drm_debugfs.h>
 16#include <drm/drm_drv.h>
 17#include <drm/drm_fbdev_generic.h>
 18#include <drm/drm_gem_dma_helper.h>
 19#include <drm/drm_gem_framebuffer_helper.h>
 20#include <drm/drm_of.h>
 21#include <drm/drm_probe_helper.h>
 22
 23#include "sti_drv.h"
 24#include "sti_plane.h"
 25
 26#define DRIVER_NAME	"sti"
 27#define DRIVER_DESC	"STMicroelectronics SoC DRM"
 28#define DRIVER_DATE	"20140601"
 29#define DRIVER_MAJOR	1
 30#define DRIVER_MINOR	0
 31
 32#define STI_MAX_FB_HEIGHT	4096
 33#define STI_MAX_FB_WIDTH	4096
 34
 35static int sti_drm_fps_get(void *data, u64 *val)
 36{
 37	struct drm_device *drm_dev = data;
 38	struct drm_plane *p;
 39	unsigned int i = 0;
 40
 41	*val = 0;
 42	list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
 43		struct sti_plane *plane = to_sti_plane(p);
 44
 45		*val |= plane->fps_info.output << i;
 46		i++;
 47	}
 48
 49	return 0;
 50}
 51
 52static int sti_drm_fps_set(void *data, u64 val)
 53{
 54	struct drm_device *drm_dev = data;
 55	struct drm_plane *p;
 56	unsigned int i = 0;
 57
 58	list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
 59		struct sti_plane *plane = to_sti_plane(p);
 60
 61		memset(&plane->fps_info, 0, sizeof(plane->fps_info));
 62		plane->fps_info.output = (val >> i) & 1;
 63
 64		i++;
 65	}
 66
 67	return 0;
 68}
 69
 70DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops,
 71			sti_drm_fps_get, sti_drm_fps_set, "%llu\n");
 72
 73static int sti_drm_fps_dbg_show(struct seq_file *s, void *data)
 74{
 75	struct drm_info_node *node = s->private;
 76	struct drm_device *dev = node->minor->dev;
 77	struct drm_plane *p;
 78
 79	list_for_each_entry(p, &dev->mode_config.plane_list, head) {
 80		struct sti_plane *plane = to_sti_plane(p);
 81
 82		seq_printf(s, "%s%s\n",
 83			   plane->fps_info.fps_str,
 84			   plane->fps_info.fips_str);
 85	}
 86
 87	return 0;
 88}
 89
 90static struct drm_info_list sti_drm_dbg_list[] = {
 91	{"fps_get", sti_drm_fps_dbg_show, 0},
 92};
 93
 94static void sti_drm_dbg_init(struct drm_minor *minor)
 95{
 96	drm_debugfs_create_files(sti_drm_dbg_list,
 97				 ARRAY_SIZE(sti_drm_dbg_list),
 98				 minor->debugfs_root, minor);
 99
100	debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root,
101			    minor->dev, &sti_drm_fps_fops);
102
103	DRM_INFO("%s: debugfs installed\n", DRIVER_NAME);
104}
105
106static const struct drm_mode_config_funcs sti_mode_config_funcs = {
107	.fb_create = drm_gem_fb_create,
108	.atomic_check = drm_atomic_helper_check,
109	.atomic_commit = drm_atomic_helper_commit,
110};
111
112static void sti_mode_config_init(struct drm_device *dev)
113{
114	dev->mode_config.min_width = 0;
115	dev->mode_config.min_height = 0;
116
117	/*
118	 * set max width and height as default value.
119	 * this value would be used to check framebuffer size limitation
120	 * at drm_mode_addfb().
121	 */
122	dev->mode_config.max_width = STI_MAX_FB_WIDTH;
123	dev->mode_config.max_height = STI_MAX_FB_HEIGHT;
124
125	dev->mode_config.funcs = &sti_mode_config_funcs;
126
127	dev->mode_config.normalize_zpos = true;
128}
129
130DEFINE_DRM_GEM_DMA_FOPS(sti_driver_fops);
131
132static const struct drm_driver sti_driver = {
133	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
134	.fops = &sti_driver_fops,
135	DRM_GEM_DMA_DRIVER_OPS,
136
137	.debugfs_init = sti_drm_dbg_init,
138
139	.name = DRIVER_NAME,
140	.desc = DRIVER_DESC,
141	.date = DRIVER_DATE,
142	.major = DRIVER_MAJOR,
143	.minor = DRIVER_MINOR,
144};
145
146static int sti_init(struct drm_device *ddev)
147{
148	struct sti_private *private;
149
150	private = kzalloc(sizeof(*private), GFP_KERNEL);
151	if (!private)
152		return -ENOMEM;
153
154	ddev->dev_private = (void *)private;
155	dev_set_drvdata(ddev->dev, ddev);
156	private->drm_dev = ddev;
157
158	drm_mode_config_init(ddev);
159
160	sti_mode_config_init(ddev);
161
162	drm_kms_helper_poll_init(ddev);
163
164	return 0;
165}
166
167static void sti_cleanup(struct drm_device *ddev)
168{
169	struct sti_private *private = ddev->dev_private;
170
171	drm_kms_helper_poll_fini(ddev);
172	drm_atomic_helper_shutdown(ddev);
173	drm_mode_config_cleanup(ddev);
174	component_unbind_all(ddev->dev, ddev);
175	kfree(private);
176	ddev->dev_private = NULL;
177}
178
179static int sti_bind(struct device *dev)
180{
181	struct drm_device *ddev;
182	int ret;
183
184	ddev = drm_dev_alloc(&sti_driver, dev);
185	if (IS_ERR(ddev))
186		return PTR_ERR(ddev);
187
188	ret = sti_init(ddev);
189	if (ret)
190		goto err_drm_dev_put;
191
192	ret = component_bind_all(ddev->dev, ddev);
193	if (ret)
194		goto err_cleanup;
195
196	ret = drm_dev_register(ddev, 0);
197	if (ret)
198		goto err_cleanup;
199
200	drm_mode_config_reset(ddev);
201
202	drm_fbdev_generic_setup(ddev, 32);
203
204	return 0;
205
206err_cleanup:
207	sti_cleanup(ddev);
208err_drm_dev_put:
209	drm_dev_put(ddev);
210	return ret;
211}
212
213static void sti_unbind(struct device *dev)
214{
215	struct drm_device *ddev = dev_get_drvdata(dev);
216
217	drm_dev_unregister(ddev);
218	sti_cleanup(ddev);
219	drm_dev_put(ddev);
220}
221
222static const struct component_master_ops sti_ops = {
223	.bind = sti_bind,
224	.unbind = sti_unbind,
225};
226
227static int sti_platform_probe(struct platform_device *pdev)
228{
229	struct device *dev = &pdev->dev;
230	struct device_node *node = dev->of_node;
231	struct device_node *child_np;
232	struct component_match *match = NULL;
233
234	dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
235
236	devm_of_platform_populate(dev);
237
238	child_np = of_get_next_available_child(node, NULL);
239
240	while (child_np) {
241		drm_of_component_match_add(dev, &match, component_compare_of,
242					   child_np);
243		child_np = of_get_next_available_child(node, child_np);
244	}
245
246	return component_master_add_with_match(dev, &sti_ops, match);
247}
248
249static int sti_platform_remove(struct platform_device *pdev)
250{
251	component_master_del(&pdev->dev, &sti_ops);
252
253	return 0;
254}
255
256static const struct of_device_id sti_dt_ids[] = {
257	{ .compatible = "st,sti-display-subsystem", },
258	{ /* end node */ },
259};
260MODULE_DEVICE_TABLE(of, sti_dt_ids);
261
262static struct platform_driver sti_platform_driver = {
263	.probe = sti_platform_probe,
264	.remove = sti_platform_remove,
265	.driver = {
266		.name = DRIVER_NAME,
267		.of_match_table = sti_dt_ids,
268	},
269};
270
271static struct platform_driver * const drivers[] = {
272	&sti_tvout_driver,
273	&sti_hqvdp_driver,
274	&sti_hdmi_driver,
275	&sti_hda_driver,
276	&sti_dvo_driver,
277	&sti_vtg_driver,
278	&sti_compositor_driver,
279	&sti_platform_driver,
280};
281
282static int sti_drm_init(void)
283{
284	if (drm_firmware_drivers_only())
285		return -ENODEV;
286
287	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
288}
289module_init(sti_drm_init);
290
291static void sti_drm_exit(void)
292{
293	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
294}
295module_exit(sti_drm_exit);
296
297MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
298MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
299MODULE_LICENSE("GPL");