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/debugfs.h>
  9#include <linux/dma-mapping.h>
 10#include <linux/kernel.h>
 11#include <linux/module.h>
 12#include <linux/of.h>
 13#include <linux/of_platform.h>
 14#include <linux/platform_device.h>
 15
 16#include <drm/drm_atomic.h>
 17#include <drm/drm_atomic_helper.h>
 18#include <drm/drm_client_setup.h>
 19#include <drm/drm_debugfs.h>
 20#include <drm/drm_drv.h>
 21#include <drm/drm_fbdev_dma.h>
 22#include <drm/drm_gem_dma_helper.h>
 23#include <drm/drm_gem_framebuffer_helper.h>
 24#include <drm/drm_of.h>
 25#include <drm/drm_probe_helper.h>
 26
 27#include "sti_drv.h"
 28#include "sti_plane.h"
 29
 30#define DRIVER_NAME	"sti"
 31#define DRIVER_DESC	"STMicroelectronics SoC DRM"
 32#define DRIVER_DATE	"20140601"
 33#define DRIVER_MAJOR	1
 34#define DRIVER_MINOR	0
 35
 36#define STI_MAX_FB_HEIGHT	4096
 37#define STI_MAX_FB_WIDTH	4096
 38
 39static int sti_drm_fps_get(void *data, u64 *val)
 40{
 41	struct drm_device *drm_dev = data;
 42	struct drm_plane *p;
 43	unsigned int i = 0;
 44
 45	*val = 0;
 46	list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
 47		struct sti_plane *plane = to_sti_plane(p);
 48
 49		*val |= plane->fps_info.output << i;
 50		i++;
 51	}
 52
 53	return 0;
 54}
 55
 56static int sti_drm_fps_set(void *data, u64 val)
 57{
 58	struct drm_device *drm_dev = data;
 59	struct drm_plane *p;
 60	unsigned int i = 0;
 61
 62	list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
 63		struct sti_plane *plane = to_sti_plane(p);
 64
 65		memset(&plane->fps_info, 0, sizeof(plane->fps_info));
 66		plane->fps_info.output = (val >> i) & 1;
 67
 68		i++;
 69	}
 70
 71	return 0;
 72}
 73
 74DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops,
 75			sti_drm_fps_get, sti_drm_fps_set, "%llu\n");
 76
 77static int sti_drm_fps_dbg_show(struct seq_file *s, void *data)
 78{
 79	struct drm_info_node *node = s->private;
 80	struct drm_device *dev = node->minor->dev;
 81	struct drm_plane *p;
 82
 83	list_for_each_entry(p, &dev->mode_config.plane_list, head) {
 84		struct sti_plane *plane = to_sti_plane(p);
 85
 86		seq_printf(s, "%s%s\n",
 87			   plane->fps_info.fps_str,
 88			   plane->fps_info.fips_str);
 89	}
 90
 91	return 0;
 92}
 93
 94static struct drm_info_list sti_drm_dbg_list[] = {
 95	{"fps_get", sti_drm_fps_dbg_show, 0},
 96};
 97
 98static void sti_drm_dbg_init(struct drm_minor *minor)
 99{
100	drm_debugfs_create_files(sti_drm_dbg_list,
101				 ARRAY_SIZE(sti_drm_dbg_list),
102				 minor->debugfs_root, minor);
103
104	debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root,
105			    minor->dev, &sti_drm_fps_fops);
106
107	DRM_INFO("%s: debugfs installed\n", DRIVER_NAME);
108}
109
110static const struct drm_mode_config_funcs sti_mode_config_funcs = {
111	.fb_create = drm_gem_fb_create,
112	.atomic_check = drm_atomic_helper_check,
113	.atomic_commit = drm_atomic_helper_commit,
114};
115
116static void sti_mode_config_init(struct drm_device *dev)
117{
118	dev->mode_config.min_width = 0;
119	dev->mode_config.min_height = 0;
120
121	/*
122	 * set max width and height as default value.
123	 * this value would be used to check framebuffer size limitation
124	 * at drm_mode_addfb().
125	 */
126	dev->mode_config.max_width = STI_MAX_FB_WIDTH;
127	dev->mode_config.max_height = STI_MAX_FB_HEIGHT;
128
129	dev->mode_config.funcs = &sti_mode_config_funcs;
130
131	dev->mode_config.normalize_zpos = true;
132}
133
134DEFINE_DRM_GEM_DMA_FOPS(sti_driver_fops);
135
136static const struct drm_driver sti_driver = {
137	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
138	.fops = &sti_driver_fops,
139	DRM_GEM_DMA_DRIVER_OPS,
140	DRM_FBDEV_DMA_DRIVER_OPS,
141
142	.debugfs_init = sti_drm_dbg_init,
143
144	.name = DRIVER_NAME,
145	.desc = DRIVER_DESC,
146	.date = DRIVER_DATE,
147	.major = DRIVER_MAJOR,
148	.minor = DRIVER_MINOR,
149};
150
151static int sti_init(struct drm_device *ddev)
152{
153	struct sti_private *private;
154
155	private = kzalloc(sizeof(*private), GFP_KERNEL);
156	if (!private)
157		return -ENOMEM;
158
159	ddev->dev_private = (void *)private;
160	dev_set_drvdata(ddev->dev, ddev);
161	private->drm_dev = ddev;
162
163	drm_mode_config_init(ddev);
164
165	sti_mode_config_init(ddev);
166
167	drm_kms_helper_poll_init(ddev);
168
169	return 0;
170}
171
172static void sti_cleanup(struct drm_device *ddev)
173{
174	struct sti_private *private = ddev->dev_private;
175
176	drm_kms_helper_poll_fini(ddev);
177	drm_atomic_helper_shutdown(ddev);
178	drm_mode_config_cleanup(ddev);
179	component_unbind_all(ddev->dev, ddev);
180	dev_set_drvdata(ddev->dev, NULL);
181	kfree(private);
182	ddev->dev_private = NULL;
183}
184
185static int sti_bind(struct device *dev)
186{
187	struct drm_device *ddev;
188	int ret;
189
190	ddev = drm_dev_alloc(&sti_driver, dev);
191	if (IS_ERR(ddev))
192		return PTR_ERR(ddev);
193
194	ret = sti_init(ddev);
195	if (ret)
196		goto err_drm_dev_put;
197
198	ret = component_bind_all(ddev->dev, ddev);
199	if (ret)
200		goto err_cleanup;
201
202	ret = drm_dev_register(ddev, 0);
203	if (ret)
204		goto err_cleanup;
205
206	drm_mode_config_reset(ddev);
207
208	drm_client_setup(ddev, NULL);
209
210	return 0;
211
212err_cleanup:
213	sti_cleanup(ddev);
214err_drm_dev_put:
215	drm_dev_put(ddev);
216	return ret;
217}
218
219static void sti_unbind(struct device *dev)
220{
221	struct drm_device *ddev = dev_get_drvdata(dev);
222
223	drm_dev_unregister(ddev);
224	sti_cleanup(ddev);
225	drm_dev_put(ddev);
226}
227
228static const struct component_master_ops sti_ops = {
229	.bind = sti_bind,
230	.unbind = sti_unbind,
231};
232
233static int sti_platform_probe(struct platform_device *pdev)
234{
235	struct device *dev = &pdev->dev;
236	struct device_node *node = dev->of_node;
237	struct device_node *child_np;
238	struct component_match *match = NULL;
239
240	dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
241
242	devm_of_platform_populate(dev);
243
244	child_np = of_get_next_available_child(node, NULL);
245
246	while (child_np) {
247		drm_of_component_match_add(dev, &match, component_compare_of,
248					   child_np);
249		child_np = of_get_next_available_child(node, child_np);
250	}
251
252	return component_master_add_with_match(dev, &sti_ops, match);
253}
254
255static void sti_platform_remove(struct platform_device *pdev)
256{
257	component_master_del(&pdev->dev, &sti_ops);
258}
259
260static void sti_platform_shutdown(struct platform_device *pdev)
261{
262	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
263}
264
265static const struct of_device_id sti_dt_ids[] = {
266	{ .compatible = "st,sti-display-subsystem", },
267	{ /* end node */ },
268};
269MODULE_DEVICE_TABLE(of, sti_dt_ids);
270
271static struct platform_driver sti_platform_driver = {
272	.probe = sti_platform_probe,
273	.remove = sti_platform_remove,
274	.shutdown = sti_platform_shutdown,
275	.driver = {
276		.name = DRIVER_NAME,
277		.of_match_table = sti_dt_ids,
278	},
279};
280
281static struct platform_driver * const drivers[] = {
282	&sti_tvout_driver,
283	&sti_hqvdp_driver,
284	&sti_hdmi_driver,
285	&sti_hda_driver,
286	&sti_dvo_driver,
287	&sti_vtg_driver,
288	&sti_compositor_driver,
289	&sti_platform_driver,
290};
291
292static int sti_drm_init(void)
293{
294	if (drm_firmware_drivers_only())
295		return -ENODEV;
296
297	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
298}
299module_init(sti_drm_init);
300
301static void sti_drm_exit(void)
302{
303	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
304}
305module_exit(sti_drm_exit);
306
307MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
308MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
309MODULE_LICENSE("GPL");