1 /*
2 * Copyright (C) STMicroelectronics SA 2014
3 * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
4 * License terms: GNU General Public License (GPL), version 2
5 */
6
7 #include <drm/drmP.h>
8
9 #include <linux/component.h>
10 #include <linux/debugfs.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/of_platform.h>
14
15 #include <drm/drm_crtc_helper.h>
16 #include <drm/drm_gem_cma_helper.h>
17 #include <drm/drm_fb_cma_helper.h>
18
19 #include "sti_drm_drv.h"
20 #include "sti_drm_crtc.h"
21
22 #define DRIVER_NAME "sti"
23 #define DRIVER_DESC "STMicroelectronics SoC DRM"
24 #define DRIVER_DATE "20140601"
25 #define DRIVER_MAJOR 1
26 #define DRIVER_MINOR 0
27
28 #define STI_MAX_FB_HEIGHT 4096
29 #define STI_MAX_FB_WIDTH 4096
30
31 static struct drm_mode_config_funcs sti_drm_mode_config_funcs = {
32 .fb_create = drm_fb_cma_create,
33 };
34
sti_drm_mode_config_init(struct drm_device * dev)35 static void sti_drm_mode_config_init(struct drm_device *dev)
36 {
37 dev->mode_config.min_width = 0;
38 dev->mode_config.min_height = 0;
39
40 /*
41 * set max width and height as default value.
42 * this value would be used to check framebuffer size limitation
43 * at drm_mode_addfb().
44 */
45 dev->mode_config.max_width = STI_MAX_FB_HEIGHT;
46 dev->mode_config.max_height = STI_MAX_FB_WIDTH;
47
48 dev->mode_config.funcs = &sti_drm_mode_config_funcs;
49 }
50
sti_drm_load(struct drm_device * dev,unsigned long flags)51 static int sti_drm_load(struct drm_device *dev, unsigned long flags)
52 {
53 struct sti_drm_private *private;
54 int ret;
55
56 private = kzalloc(sizeof(struct sti_drm_private), GFP_KERNEL);
57 if (!private) {
58 DRM_ERROR("Failed to allocate private\n");
59 return -ENOMEM;
60 }
61 dev->dev_private = (void *)private;
62 private->drm_dev = dev;
63
64 drm_mode_config_init(dev);
65 drm_kms_helper_poll_init(dev);
66
67 sti_drm_mode_config_init(dev);
68
69 ret = component_bind_all(dev->dev, dev);
70 if (ret)
71 return ret;
72
73 drm_helper_disable_unused_functions(dev);
74
75 #ifdef CONFIG_DRM_STI_FBDEV
76 drm_fbdev_cma_init(dev, 32,
77 dev->mode_config.num_crtc,
78 dev->mode_config.num_connector);
79 #endif
80 return 0;
81 }
82
83 static const struct file_operations sti_drm_driver_fops = {
84 .owner = THIS_MODULE,
85 .open = drm_open,
86 .mmap = drm_gem_cma_mmap,
87 .poll = drm_poll,
88 .read = drm_read,
89 .unlocked_ioctl = drm_ioctl,
90 #ifdef CONFIG_COMPAT
91 .compat_ioctl = drm_compat_ioctl,
92 #endif
93 .release = drm_release,
94 };
95
sti_drm_gem_prime_export(struct drm_device * dev,struct drm_gem_object * obj,int flags)96 static struct dma_buf *sti_drm_gem_prime_export(struct drm_device *dev,
97 struct drm_gem_object *obj,
98 int flags)
99 {
100 /* we want to be able to write in mmapped buffer */
101 flags |= O_RDWR;
102 return drm_gem_prime_export(dev, obj, flags);
103 }
104
105 static struct drm_driver sti_drm_driver = {
106 .driver_features = DRIVER_HAVE_IRQ | DRIVER_MODESET |
107 DRIVER_GEM | DRIVER_PRIME,
108 .load = sti_drm_load,
109 .gem_free_object = drm_gem_cma_free_object,
110 .gem_vm_ops = &drm_gem_cma_vm_ops,
111 .dumb_create = drm_gem_cma_dumb_create,
112 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
113 .dumb_destroy = drm_gem_dumb_destroy,
114 .fops = &sti_drm_driver_fops,
115
116 .get_vblank_counter = drm_vblank_count,
117 .enable_vblank = sti_drm_crtc_enable_vblank,
118 .disable_vblank = sti_drm_crtc_disable_vblank,
119
120 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
121 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
122 .gem_prime_export = sti_drm_gem_prime_export,
123 .gem_prime_import = drm_gem_prime_import,
124 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
125 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
126 .gem_prime_vmap = drm_gem_cma_prime_vmap,
127 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
128 .gem_prime_mmap = drm_gem_cma_prime_mmap,
129
130 .name = DRIVER_NAME,
131 .desc = DRIVER_DESC,
132 .date = DRIVER_DATE,
133 .major = DRIVER_MAJOR,
134 .minor = DRIVER_MINOR,
135 };
136
compare_of(struct device * dev,void * data)137 static int compare_of(struct device *dev, void *data)
138 {
139 return dev->of_node == data;
140 }
141
sti_drm_bind(struct device * dev)142 static int sti_drm_bind(struct device *dev)
143 {
144 return drm_platform_init(&sti_drm_driver, to_platform_device(dev));
145 }
146
sti_drm_unbind(struct device * dev)147 static void sti_drm_unbind(struct device *dev)
148 {
149 drm_put_dev(dev_get_drvdata(dev));
150 }
151
152 static const struct component_master_ops sti_drm_ops = {
153 .bind = sti_drm_bind,
154 .unbind = sti_drm_unbind,
155 };
156
sti_drm_master_probe(struct platform_device * pdev)157 static int sti_drm_master_probe(struct platform_device *pdev)
158 {
159 struct device *dev = &pdev->dev;
160 struct device_node *node = dev->parent->of_node;
161 struct device_node *child_np;
162 struct component_match *match = NULL;
163
164 dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
165
166 child_np = of_get_next_available_child(node, NULL);
167
168 while (child_np) {
169 component_match_add(dev, &match, compare_of, child_np);
170 of_node_put(child_np);
171 child_np = of_get_next_available_child(node, child_np);
172 }
173
174 return component_master_add_with_match(dev, &sti_drm_ops, match);
175 }
176
sti_drm_master_remove(struct platform_device * pdev)177 static int sti_drm_master_remove(struct platform_device *pdev)
178 {
179 component_master_del(&pdev->dev, &sti_drm_ops);
180 return 0;
181 }
182
183 static struct platform_driver sti_drm_master_driver = {
184 .probe = sti_drm_master_probe,
185 .remove = sti_drm_master_remove,
186 .driver = {
187 .owner = THIS_MODULE,
188 .name = DRIVER_NAME "__master",
189 },
190 };
191
sti_drm_platform_probe(struct platform_device * pdev)192 static int sti_drm_platform_probe(struct platform_device *pdev)
193 {
194 struct device *dev = &pdev->dev;
195 struct device_node *node = dev->of_node;
196 struct platform_device *master;
197
198 of_platform_populate(node, NULL, NULL, dev);
199
200 platform_driver_register(&sti_drm_master_driver);
201 master = platform_device_register_resndata(dev,
202 DRIVER_NAME "__master", -1,
203 NULL, 0, NULL, 0);
204 if (IS_ERR(master))
205 return PTR_ERR(master);
206
207 platform_set_drvdata(pdev, master);
208 return 0;
209 }
210
sti_drm_platform_remove(struct platform_device * pdev)211 static int sti_drm_platform_remove(struct platform_device *pdev)
212 {
213 struct platform_device *master = platform_get_drvdata(pdev);
214
215 of_platform_depopulate(&pdev->dev);
216 platform_device_unregister(master);
217 platform_driver_unregister(&sti_drm_master_driver);
218 return 0;
219 }
220
221 static const struct of_device_id sti_drm_dt_ids[] = {
222 { .compatible = "st,sti-display-subsystem", },
223 { /* end node */ },
224 };
225 MODULE_DEVICE_TABLE(of, sti_drm_dt_ids);
226
227 static struct platform_driver sti_drm_platform_driver = {
228 .probe = sti_drm_platform_probe,
229 .remove = sti_drm_platform_remove,
230 .driver = {
231 .owner = THIS_MODULE,
232 .name = DRIVER_NAME,
233 .of_match_table = sti_drm_dt_ids,
234 },
235 };
236
237 module_platform_driver(sti_drm_platform_driver);
238
239 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
240 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
241 MODULE_LICENSE("GPL");
242