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