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_fb_cma_helper.h>
 18#include <drm/drm_fb_helper.h>
 19#include <drm/drm_gem_cma_helper.h>
 20#include <drm/drm_gem_framebuffer_helper.h>
 21#include <drm/drm_of.h>
 22#include <drm/drm_probe_helper.h>
 23
 24#include "sti_crtc.h"
 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 int sti_drm_dbg_init(struct drm_minor *minor)
 97{
 98	int ret;
 99
100	ret = drm_debugfs_create_files(sti_drm_dbg_list,
101				       ARRAY_SIZE(sti_drm_dbg_list),
102				       minor->debugfs_root, minor);
103	if (ret)
104		goto err;
105
106	debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root,
107			    minor->dev, &sti_drm_fps_fops);
108
109	DRM_INFO("%s: debugfs installed\n", DRIVER_NAME);
110	return 0;
111err:
112	DRM_ERROR("%s: cannot install debugfs\n", DRIVER_NAME);
113	return ret;
114}
115
116static const struct drm_mode_config_funcs sti_mode_config_funcs = {
117	.fb_create = drm_gem_fb_create,
118	.atomic_check = drm_atomic_helper_check,
119	.atomic_commit = drm_atomic_helper_commit,
120};
121
122static void sti_mode_config_init(struct drm_device *dev)
123{
124	dev->mode_config.min_width = 0;
125	dev->mode_config.min_height = 0;
126
127	/*
128	 * set max width and height as default value.
129	 * this value would be used to check framebuffer size limitation
130	 * at drm_mode_addfb().
131	 */
132	dev->mode_config.max_width = STI_MAX_FB_WIDTH;
133	dev->mode_config.max_height = STI_MAX_FB_HEIGHT;
134
135	dev->mode_config.funcs = &sti_mode_config_funcs;
136
137	dev->mode_config.normalize_zpos = true;
138}
139
140DEFINE_DRM_GEM_CMA_FOPS(sti_driver_fops);
141
142static struct drm_driver sti_driver = {
143	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
144	.gem_free_object_unlocked = drm_gem_cma_free_object,
145	.gem_vm_ops = &drm_gem_cma_vm_ops,
146	.dumb_create = drm_gem_cma_dumb_create,
147	.fops = &sti_driver_fops,
148
149	.enable_vblank = sti_crtc_enable_vblank,
150	.disable_vblank = sti_crtc_disable_vblank,
151
152	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
153	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
154	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
155	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
156	.gem_prime_vmap = drm_gem_cma_prime_vmap,
157	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
158	.gem_prime_mmap = drm_gem_cma_prime_mmap,
159
160	.debugfs_init = sti_drm_dbg_init,
161
162	.name = DRIVER_NAME,
163	.desc = DRIVER_DESC,
164	.date = DRIVER_DATE,
165	.major = DRIVER_MAJOR,
166	.minor = DRIVER_MINOR,
167};
168
169static int compare_of(struct device *dev, void *data)
170{
171	return dev->of_node == data;
172}
173
174static int sti_init(struct drm_device *ddev)
175{
176	struct sti_private *private;
177
178	private = kzalloc(sizeof(*private), GFP_KERNEL);
179	if (!private)
180		return -ENOMEM;
181
182	ddev->dev_private = (void *)private;
183	dev_set_drvdata(ddev->dev, ddev);
184	private->drm_dev = ddev;
185
186	drm_mode_config_init(ddev);
187
188	sti_mode_config_init(ddev);
189
190	drm_kms_helper_poll_init(ddev);
191
192	return 0;
193}
194
195static void sti_cleanup(struct drm_device *ddev)
196{
197	struct sti_private *private = ddev->dev_private;
198
199	drm_kms_helper_poll_fini(ddev);
200	drm_atomic_helper_shutdown(ddev);
201	drm_mode_config_cleanup(ddev);
202	component_unbind_all(ddev->dev, ddev);
203	kfree(private);
204	ddev->dev_private = NULL;
205}
206
207static int sti_bind(struct device *dev)
208{
209	struct drm_device *ddev;
210	int ret;
211
212	ddev = drm_dev_alloc(&sti_driver, dev);
213	if (IS_ERR(ddev))
214		return PTR_ERR(ddev);
215
216	ret = sti_init(ddev);
217	if (ret)
218		goto err_drm_dev_put;
219
220	ret = component_bind_all(ddev->dev, ddev);
221	if (ret)
222		goto err_cleanup;
223
224	ret = drm_dev_register(ddev, 0);
225	if (ret)
226		goto err_cleanup;
227
228	drm_mode_config_reset(ddev);
229
230	drm_fbdev_generic_setup(ddev, 32);
231
232	return 0;
233
234err_cleanup:
235	sti_cleanup(ddev);
236err_drm_dev_put:
237	drm_dev_put(ddev);
238	return ret;
239}
240
241static void sti_unbind(struct device *dev)
242{
243	struct drm_device *ddev = dev_get_drvdata(dev);
244
245	drm_dev_unregister(ddev);
246	sti_cleanup(ddev);
247	drm_dev_put(ddev);
248}
249
250static const struct component_master_ops sti_ops = {
251	.bind = sti_bind,
252	.unbind = sti_unbind,
253};
254
255static int sti_platform_probe(struct platform_device *pdev)
256{
257	struct device *dev = &pdev->dev;
258	struct device_node *node = dev->of_node;
259	struct device_node *child_np;
260	struct component_match *match = NULL;
261
262	dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
263
264	devm_of_platform_populate(dev);
265
266	child_np = of_get_next_available_child(node, NULL);
267
268	while (child_np) {
269		drm_of_component_match_add(dev, &match, compare_of,
270					   child_np);
271		child_np = of_get_next_available_child(node, child_np);
272	}
273
274	return component_master_add_with_match(dev, &sti_ops, match);
275}
276
277static int sti_platform_remove(struct platform_device *pdev)
278{
279	component_master_del(&pdev->dev, &sti_ops);
280
281	return 0;
282}
283
284static const struct of_device_id sti_dt_ids[] = {
285	{ .compatible = "st,sti-display-subsystem", },
286	{ /* end node */ },
287};
288MODULE_DEVICE_TABLE(of, sti_dt_ids);
289
290static struct platform_driver sti_platform_driver = {
291	.probe = sti_platform_probe,
292	.remove = sti_platform_remove,
293	.driver = {
294		.name = DRIVER_NAME,
295		.of_match_table = sti_dt_ids,
296	},
297};
298
299static struct platform_driver * const drivers[] = {
300	&sti_tvout_driver,
301	&sti_hqvdp_driver,
302	&sti_hdmi_driver,
303	&sti_hda_driver,
304	&sti_dvo_driver,
305	&sti_vtg_driver,
306	&sti_compositor_driver,
307	&sti_platform_driver,
308};
309
310static int sti_drm_init(void)
311{
312	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
313}
314module_init(sti_drm_init);
315
316static void sti_drm_exit(void)
317{
318	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
319}
320module_exit(sti_drm_exit);
321
322MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
323MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
324MODULE_LICENSE("GPL");