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_drv.h"
25 #include "sti_plane.h"
26
27 #define DRIVER_NAME "sti"
28 #define DRIVER_DESC "STMicroelectronics SoC DRM"
29 #define DRIVER_DATE "20140601"
30 #define DRIVER_MAJOR 1
31 #define DRIVER_MINOR 0
32
33 #define STI_MAX_FB_HEIGHT 4096
34 #define STI_MAX_FB_WIDTH 4096
35
sti_drm_fps_get(void * data,u64 * val)36 static int sti_drm_fps_get(void *data, u64 *val)
37 {
38 struct drm_device *drm_dev = data;
39 struct drm_plane *p;
40 unsigned int i = 0;
41
42 *val = 0;
43 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
44 struct sti_plane *plane = to_sti_plane(p);
45
46 *val |= plane->fps_info.output << i;
47 i++;
48 }
49
50 return 0;
51 }
52
sti_drm_fps_set(void * data,u64 val)53 static int sti_drm_fps_set(void *data, u64 val)
54 {
55 struct drm_device *drm_dev = data;
56 struct drm_plane *p;
57 unsigned int i = 0;
58
59 list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
60 struct sti_plane *plane = to_sti_plane(p);
61
62 memset(&plane->fps_info, 0, sizeof(plane->fps_info));
63 plane->fps_info.output = (val >> i) & 1;
64
65 i++;
66 }
67
68 return 0;
69 }
70
71 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops,
72 sti_drm_fps_get, sti_drm_fps_set, "%llu\n");
73
sti_drm_fps_dbg_show(struct seq_file * s,void * data)74 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data)
75 {
76 struct drm_info_node *node = s->private;
77 struct drm_device *dev = node->minor->dev;
78 struct drm_plane *p;
79
80 list_for_each_entry(p, &dev->mode_config.plane_list, head) {
81 struct sti_plane *plane = to_sti_plane(p);
82
83 seq_printf(s, "%s%s\n",
84 plane->fps_info.fps_str,
85 plane->fps_info.fips_str);
86 }
87
88 return 0;
89 }
90
91 static struct drm_info_list sti_drm_dbg_list[] = {
92 {"fps_get", sti_drm_fps_dbg_show, 0},
93 };
94
sti_drm_dbg_init(struct drm_minor * minor)95 static void sti_drm_dbg_init(struct drm_minor *minor)
96 {
97 drm_debugfs_create_files(sti_drm_dbg_list,
98 ARRAY_SIZE(sti_drm_dbg_list),
99 minor->debugfs_root, minor);
100
101 debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root,
102 minor->dev, &sti_drm_fps_fops);
103
104 DRM_INFO("%s: debugfs installed\n", DRIVER_NAME);
105 }
106
107 static const struct drm_mode_config_funcs sti_mode_config_funcs = {
108 .fb_create = drm_gem_fb_create,
109 .atomic_check = drm_atomic_helper_check,
110 .atomic_commit = drm_atomic_helper_commit,
111 };
112
sti_mode_config_init(struct drm_device * dev)113 static void sti_mode_config_init(struct drm_device *dev)
114 {
115 dev->mode_config.min_width = 0;
116 dev->mode_config.min_height = 0;
117
118 /*
119 * set max width and height as default value.
120 * this value would be used to check framebuffer size limitation
121 * at drm_mode_addfb().
122 */
123 dev->mode_config.max_width = STI_MAX_FB_WIDTH;
124 dev->mode_config.max_height = STI_MAX_FB_HEIGHT;
125
126 dev->mode_config.funcs = &sti_mode_config_funcs;
127
128 dev->mode_config.normalize_zpos = true;
129 }
130
131 DEFINE_DRM_GEM_CMA_FOPS(sti_driver_fops);
132
133 static const struct drm_driver sti_driver = {
134 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
135 .fops = &sti_driver_fops,
136 DRM_GEM_CMA_DRIVER_OPS,
137
138 .debugfs_init = sti_drm_dbg_init,
139
140 .name = DRIVER_NAME,
141 .desc = DRIVER_DESC,
142 .date = DRIVER_DATE,
143 .major = DRIVER_MAJOR,
144 .minor = DRIVER_MINOR,
145 };
146
compare_of(struct device * dev,void * data)147 static int compare_of(struct device *dev, void *data)
148 {
149 return dev->of_node == data;
150 }
151
sti_init(struct drm_device * ddev)152 static int sti_init(struct drm_device *ddev)
153 {
154 struct sti_private *private;
155
156 private = kzalloc(sizeof(*private), GFP_KERNEL);
157 if (!private)
158 return -ENOMEM;
159
160 ddev->dev_private = (void *)private;
161 dev_set_drvdata(ddev->dev, ddev);
162 private->drm_dev = ddev;
163
164 drm_mode_config_init(ddev);
165
166 sti_mode_config_init(ddev);
167
168 drm_kms_helper_poll_init(ddev);
169
170 return 0;
171 }
172
sti_cleanup(struct drm_device * ddev)173 static void sti_cleanup(struct drm_device *ddev)
174 {
175 struct sti_private *private = ddev->dev_private;
176
177 drm_kms_helper_poll_fini(ddev);
178 drm_atomic_helper_shutdown(ddev);
179 drm_mode_config_cleanup(ddev);
180 component_unbind_all(ddev->dev, ddev);
181 kfree(private);
182 ddev->dev_private = NULL;
183 }
184
sti_bind(struct device * dev)185 static 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_fbdev_generic_setup(ddev, 32);
209
210 return 0;
211
212 err_cleanup:
213 sti_cleanup(ddev);
214 err_drm_dev_put:
215 drm_dev_put(ddev);
216 return ret;
217 }
218
sti_unbind(struct device * dev)219 static 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
228 static const struct component_master_ops sti_ops = {
229 .bind = sti_bind,
230 .unbind = sti_unbind,
231 };
232
sti_platform_probe(struct platform_device * pdev)233 static 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, 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
sti_platform_remove(struct platform_device * pdev)255 static int sti_platform_remove(struct platform_device *pdev)
256 {
257 component_master_del(&pdev->dev, &sti_ops);
258
259 return 0;
260 }
261
262 static const struct of_device_id sti_dt_ids[] = {
263 { .compatible = "st,sti-display-subsystem", },
264 { /* end node */ },
265 };
266 MODULE_DEVICE_TABLE(of, sti_dt_ids);
267
268 static struct platform_driver sti_platform_driver = {
269 .probe = sti_platform_probe,
270 .remove = sti_platform_remove,
271 .driver = {
272 .name = DRIVER_NAME,
273 .of_match_table = sti_dt_ids,
274 },
275 };
276
277 static struct platform_driver * const drivers[] = {
278 &sti_tvout_driver,
279 &sti_hqvdp_driver,
280 &sti_hdmi_driver,
281 &sti_hda_driver,
282 &sti_dvo_driver,
283 &sti_vtg_driver,
284 &sti_compositor_driver,
285 &sti_platform_driver,
286 };
287
sti_drm_init(void)288 static int sti_drm_init(void)
289 {
290 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
291 }
292 module_init(sti_drm_init);
293
sti_drm_exit(void)294 static void sti_drm_exit(void)
295 {
296 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
297 }
298 module_exit(sti_drm_exit);
299
300 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
301 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
302 MODULE_LICENSE("GPL");
303