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 dev_set_drvdata(ddev->dev, NULL);
178 kfree(private);
179 ddev->dev_private = NULL;
180 }
181
sti_bind(struct device * dev)182 static 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
209 err_cleanup:
210 sti_cleanup(ddev);
211 err_drm_dev_put:
212 drm_dev_put(ddev);
213 return ret;
214 }
215
sti_unbind(struct device * dev)216 static 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
225 static const struct component_master_ops sti_ops = {
226 .bind = sti_bind,
227 .unbind = sti_unbind,
228 };
229
sti_platform_probe(struct platform_device * pdev)230 static 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
sti_platform_remove(struct platform_device * pdev)252 static void sti_platform_remove(struct platform_device *pdev)
253 {
254 component_master_del(&pdev->dev, &sti_ops);
255 }
256
sti_platform_shutdown(struct platform_device * pdev)257 static void sti_platform_shutdown(struct platform_device *pdev)
258 {
259 drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
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_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
278 static 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
sti_drm_init(void)289 static 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 }
296 module_init(sti_drm_init);
297
sti_drm_exit(void)298 static void sti_drm_exit(void)
299 {
300 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
301 }
302 module_exit(sti_drm_exit);
303
304 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
305 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
306 MODULE_LICENSE("GPL");
307