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