1 /*
2 * Copyright 2016 Linaro Ltd.
3 * Copyright 2016 ZTE Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 */
10
11 #include <linux/clk.h>
12 #include <linux/component.h>
13 #include <linux/list.h>
14 #include <linux/module.h>
15 #include <linux/of_graph.h>
16 #include <linux/of_platform.h>
17 #include <linux/spinlock.h>
18
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_crtc.h>
21 #include <drm/drm_crtc_helper.h>
22 #include <drm/drm_fb_cma_helper.h>
23 #include <drm/drm_fb_helper.h>
24 #include <drm/drm_gem_cma_helper.h>
25 #include <drm/drm_of.h>
26 #include <drm/drmP.h>
27
28 #include "zx_drm_drv.h"
29 #include "zx_vou.h"
30
31 struct zx_drm_private {
32 struct drm_fbdev_cma *fbdev;
33 };
34
zx_drm_fb_output_poll_changed(struct drm_device * drm)35 static void zx_drm_fb_output_poll_changed(struct drm_device *drm)
36 {
37 struct zx_drm_private *priv = drm->dev_private;
38
39 drm_fbdev_cma_hotplug_event(priv->fbdev);
40 }
41
42 static const struct drm_mode_config_funcs zx_drm_mode_config_funcs = {
43 .fb_create = drm_fb_cma_create,
44 .output_poll_changed = zx_drm_fb_output_poll_changed,
45 .atomic_check = drm_atomic_helper_check,
46 .atomic_commit = drm_atomic_helper_commit,
47 };
48
zx_drm_lastclose(struct drm_device * drm)49 static void zx_drm_lastclose(struct drm_device *drm)
50 {
51 struct zx_drm_private *priv = drm->dev_private;
52
53 drm_fbdev_cma_restore_mode(priv->fbdev);
54 }
55
56 DEFINE_DRM_GEM_CMA_FOPS(zx_drm_fops);
57
58 static struct drm_driver zx_drm_driver = {
59 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
60 DRIVER_ATOMIC,
61 .lastclose = zx_drm_lastclose,
62 .gem_free_object_unlocked = drm_gem_cma_free_object,
63 .gem_vm_ops = &drm_gem_cma_vm_ops,
64 .dumb_create = drm_gem_cma_dumb_create,
65 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
66 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
67 .gem_prime_export = drm_gem_prime_export,
68 .gem_prime_import = drm_gem_prime_import,
69 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
70 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
71 .gem_prime_vmap = drm_gem_cma_prime_vmap,
72 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
73 .gem_prime_mmap = drm_gem_cma_prime_mmap,
74 .fops = &zx_drm_fops,
75 .name = "zx-vou",
76 .desc = "ZTE VOU Controller DRM",
77 .date = "20160811",
78 .major = 1,
79 .minor = 0,
80 };
81
zx_drm_bind(struct device * dev)82 static int zx_drm_bind(struct device *dev)
83 {
84 struct drm_device *drm;
85 struct zx_drm_private *priv;
86 int ret;
87
88 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
89 if (!priv)
90 return -ENOMEM;
91
92 drm = drm_dev_alloc(&zx_drm_driver, dev);
93 if (IS_ERR(drm))
94 return PTR_ERR(drm);
95
96 drm->dev_private = priv;
97 dev_set_drvdata(dev, drm);
98
99 drm_mode_config_init(drm);
100 drm->mode_config.min_width = 16;
101 drm->mode_config.min_height = 16;
102 drm->mode_config.max_width = 4096;
103 drm->mode_config.max_height = 4096;
104 drm->mode_config.funcs = &zx_drm_mode_config_funcs;
105
106 ret = component_bind_all(dev, drm);
107 if (ret) {
108 DRM_DEV_ERROR(dev, "failed to bind all components: %d\n", ret);
109 goto out_unregister;
110 }
111
112 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
113 if (ret < 0) {
114 DRM_DEV_ERROR(dev, "failed to init vblank: %d\n", ret);
115 goto out_unbind;
116 }
117
118 /*
119 * We will manage irq handler on our own. In this case, irq_enabled
120 * need to be true for using vblank core support.
121 */
122 drm->irq_enabled = true;
123
124 drm_mode_config_reset(drm);
125 drm_kms_helper_poll_init(drm);
126
127 priv->fbdev = drm_fbdev_cma_init(drm, 32,
128 drm->mode_config.num_connector);
129 if (IS_ERR(priv->fbdev)) {
130 ret = PTR_ERR(priv->fbdev);
131 DRM_DEV_ERROR(dev, "failed to init cma fbdev: %d\n", ret);
132 priv->fbdev = NULL;
133 goto out_poll_fini;
134 }
135
136 ret = drm_dev_register(drm, 0);
137 if (ret)
138 goto out_fbdev_fini;
139
140 return 0;
141
142 out_fbdev_fini:
143 if (priv->fbdev) {
144 drm_fbdev_cma_fini(priv->fbdev);
145 priv->fbdev = NULL;
146 }
147 out_poll_fini:
148 drm_kms_helper_poll_fini(drm);
149 drm_mode_config_cleanup(drm);
150 out_unbind:
151 component_unbind_all(dev, drm);
152 out_unregister:
153 dev_set_drvdata(dev, NULL);
154 drm->dev_private = NULL;
155 drm_dev_unref(drm);
156 return ret;
157 }
158
zx_drm_unbind(struct device * dev)159 static void zx_drm_unbind(struct device *dev)
160 {
161 struct drm_device *drm = dev_get_drvdata(dev);
162 struct zx_drm_private *priv = drm->dev_private;
163
164 drm_dev_unregister(drm);
165 if (priv->fbdev) {
166 drm_fbdev_cma_fini(priv->fbdev);
167 priv->fbdev = NULL;
168 }
169 drm_kms_helper_poll_fini(drm);
170 drm_mode_config_cleanup(drm);
171 component_unbind_all(dev, drm);
172 dev_set_drvdata(dev, NULL);
173 drm->dev_private = NULL;
174 drm_dev_unref(drm);
175 }
176
177 static const struct component_master_ops zx_drm_master_ops = {
178 .bind = zx_drm_bind,
179 .unbind = zx_drm_unbind,
180 };
181
compare_of(struct device * dev,void * data)182 static int compare_of(struct device *dev, void *data)
183 {
184 return dev->of_node == data;
185 }
186
zx_drm_probe(struct platform_device * pdev)187 static int zx_drm_probe(struct platform_device *pdev)
188 {
189 struct device *dev = &pdev->dev;
190 struct device_node *parent = dev->of_node;
191 struct device_node *child;
192 struct component_match *match = NULL;
193 int ret;
194
195 ret = devm_of_platform_populate(dev);
196 if (ret)
197 return ret;
198
199 for_each_available_child_of_node(parent, child) {
200 component_match_add(dev, &match, compare_of, child);
201 of_node_put(child);
202 }
203
204 return component_master_add_with_match(dev, &zx_drm_master_ops, match);
205 }
206
zx_drm_remove(struct platform_device * pdev)207 static int zx_drm_remove(struct platform_device *pdev)
208 {
209 component_master_del(&pdev->dev, &zx_drm_master_ops);
210 return 0;
211 }
212
213 static const struct of_device_id zx_drm_of_match[] = {
214 { .compatible = "zte,zx296718-vou", },
215 { /* end */ },
216 };
217 MODULE_DEVICE_TABLE(of, zx_drm_of_match);
218
219 static struct platform_driver zx_drm_platform_driver = {
220 .probe = zx_drm_probe,
221 .remove = zx_drm_remove,
222 .driver = {
223 .name = "zx-drm",
224 .of_match_table = zx_drm_of_match,
225 },
226 };
227
228 static struct platform_driver *drivers[] = {
229 &zx_crtc_driver,
230 &zx_hdmi_driver,
231 &zx_tvenc_driver,
232 &zx_vga_driver,
233 &zx_drm_platform_driver,
234 };
235
zx_drm_init(void)236 static int zx_drm_init(void)
237 {
238 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
239 }
240 module_init(zx_drm_init);
241
zx_drm_exit(void)242 static void zx_drm_exit(void)
243 {
244 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
245 }
246 module_exit(zx_drm_exit);
247
248 MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
249 MODULE_DESCRIPTION("ZTE ZX VOU DRM driver");
250 MODULE_LICENSE("GPL v2");
251