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
sti_drm_fps_get(void * data,u64 * val)37 static 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
sti_drm_fps_set(void * data,u64 val)54 static 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
72 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops,
73 sti_drm_fps_get, sti_drm_fps_set, "%llu\n");
74
sti_drm_fps_dbg_show(struct seq_file * s,void * data)75 static 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
92 static struct drm_info_list sti_drm_dbg_list[] = {
93 {"fps_get", sti_drm_fps_dbg_show, 0},
94 };
95
sti_drm_dbg_init(struct drm_minor * minor)96 static 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
108 static 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
sti_mode_config_init(struct drm_device * dev)114 static 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
132 DEFINE_DRM_GEM_DMA_FOPS(sti_driver_fops);
133
134 static 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
sti_init(struct drm_device * ddev)148 static 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
sti_cleanup(struct drm_device * ddev)169 static 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 kfree(private);
178 ddev->dev_private = NULL;
179 }
180
sti_bind(struct device * dev)181 static int sti_bind(struct device *dev)
182 {
183 struct drm_device *ddev;
184 int ret;
185
186 ddev = drm_dev_alloc(&sti_driver, dev);
187 if (IS_ERR(ddev))
188 return PTR_ERR(ddev);
189
190 ret = sti_init(ddev);
191 if (ret)
192 goto err_drm_dev_put;
193
194 ret = component_bind_all(ddev->dev, ddev);
195 if (ret)
196 goto err_cleanup;
197
198 ret = drm_dev_register(ddev, 0);
199 if (ret)
200 goto err_cleanup;
201
202 drm_mode_config_reset(ddev);
203
204 drm_fbdev_dma_setup(ddev, 32);
205
206 return 0;
207
208 err_cleanup:
209 sti_cleanup(ddev);
210 err_drm_dev_put:
211 drm_dev_put(ddev);
212 return ret;
213 }
214
sti_unbind(struct device * dev)215 static void sti_unbind(struct device *dev)
216 {
217 struct drm_device *ddev = dev_get_drvdata(dev);
218
219 drm_dev_unregister(ddev);
220 sti_cleanup(ddev);
221 drm_dev_put(ddev);
222 }
223
224 static const struct component_master_ops sti_ops = {
225 .bind = sti_bind,
226 .unbind = sti_unbind,
227 };
228
sti_platform_probe(struct platform_device * pdev)229 static int sti_platform_probe(struct platform_device *pdev)
230 {
231 struct device *dev = &pdev->dev;
232 struct device_node *node = dev->of_node;
233 struct device_node *child_np;
234 struct component_match *match = NULL;
235
236 dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
237
238 devm_of_platform_populate(dev);
239
240 child_np = of_get_next_available_child(node, NULL);
241
242 while (child_np) {
243 drm_of_component_match_add(dev, &match, component_compare_of,
244 child_np);
245 child_np = of_get_next_available_child(node, child_np);
246 }
247
248 return component_master_add_with_match(dev, &sti_ops, match);
249 }
250
sti_platform_remove(struct platform_device * pdev)251 static void sti_platform_remove(struct platform_device *pdev)
252 {
253 component_master_del(&pdev->dev, &sti_ops);
254 }
255
256 static const struct of_device_id sti_dt_ids[] = {
257 { .compatible = "st,sti-display-subsystem", },
258 { /* end node */ },
259 };
260 MODULE_DEVICE_TABLE(of, sti_dt_ids);
261
262 static struct platform_driver sti_platform_driver = {
263 .probe = sti_platform_probe,
264 .remove_new = sti_platform_remove,
265 .driver = {
266 .name = DRIVER_NAME,
267 .of_match_table = sti_dt_ids,
268 },
269 };
270
271 static 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
sti_drm_init(void)282 static 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 }
289 module_init(sti_drm_init);
290
sti_drm_exit(void)291 static void sti_drm_exit(void)
292 {
293 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
294 }
295 module_exit(sti_drm_exit);
296
297 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
298 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
299 MODULE_LICENSE("GPL");
300