tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * ARC PGU DRM driver.
3 *
4 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17#include <linux/clk.h>
18#include <drm/drm_crtc_helper.h>
19#include <drm/drm_fb_cma_helper.h>
20#include <drm/drm_gem_cma_helper.h>
21#include <drm/drm_atomic_helper.h>
22#include <linux/of_reserved_mem.h>
23
24#include "arcpgu.h"
25#include "arcpgu_regs.h"
26
27static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
28{
29 struct arcpgu_drm_private *arcpgu = dev->dev_private;
30
31 if (arcpgu->fbdev)
32 drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
33}
34
35static int arcpgu_atomic_commit(struct drm_device *dev,
36 struct drm_atomic_state *state, bool async)
37{
38 return drm_atomic_helper_commit(dev, state, false);
39}
40
41static struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
42 .fb_create = drm_fb_cma_create,
43 .output_poll_changed = arcpgu_fb_output_poll_changed,
44 .atomic_check = drm_atomic_helper_check,
45 .atomic_commit = arcpgu_atomic_commit,
46};
47
48static void arcpgu_setup_mode_config(struct drm_device *drm)
49{
50 drm_mode_config_init(drm);
51 drm->mode_config.min_width = 0;
52 drm->mode_config.min_height = 0;
53 drm->mode_config.max_width = 1920;
54 drm->mode_config.max_height = 1080;
55 drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
56}
57
58int arcpgu_gem_mmap(struct file *filp, struct vm_area_struct *vma)
59{
60 int ret;
61
62 ret = drm_gem_mmap(filp, vma);
63 if (ret)
64 return ret;
65
66 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
67 return 0;
68}
69
70static const struct file_operations arcpgu_drm_ops = {
71 .owner = THIS_MODULE,
72 .open = drm_open,
73 .release = drm_release,
74 .unlocked_ioctl = drm_ioctl,
75#ifdef CONFIG_COMPAT
76 .compat_ioctl = drm_compat_ioctl,
77#endif
78 .poll = drm_poll,
79 .read = drm_read,
80 .llseek = no_llseek,
81 .mmap = arcpgu_gem_mmap,
82};
83
84static void arcpgu_preclose(struct drm_device *drm, struct drm_file *file)
85{
86 struct arcpgu_drm_private *arcpgu = drm->dev_private;
87 struct drm_pending_vblank_event *e, *t;
88 unsigned long flags;
89
90 spin_lock_irqsave(&drm->event_lock, flags);
91 list_for_each_entry_safe(e, t, &arcpgu->event_list, base.link) {
92 if (e->base.file_priv != file)
93 continue;
94 list_del(&e->base.link);
95 e->base.destroy(&e->base);
96 }
97 spin_unlock_irqrestore(&drm->event_lock, flags);
98}
99
100static void arcpgu_lastclose(struct drm_device *drm)
101{
102 struct arcpgu_drm_private *arcpgu = drm->dev_private;
103
104 drm_fbdev_cma_restore_mode(arcpgu->fbdev);
105}
106
107static int arcpgu_load(struct drm_device *drm)
108{
109 struct platform_device *pdev = to_platform_device(drm->dev);
110 struct arcpgu_drm_private *arcpgu;
111 struct device_node *encoder_node;
112 struct resource *res;
113 int ret;
114
115 arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
116 if (arcpgu == NULL)
117 return -ENOMEM;
118
119 drm->dev_private = arcpgu;
120
121 arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
122 if (IS_ERR(arcpgu->clk))
123 return PTR_ERR(arcpgu->clk);
124
125 INIT_LIST_HEAD(&arcpgu->event_list);
126
127 arcpgu_setup_mode_config(drm);
128
129 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
130 arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
131 if (IS_ERR(arcpgu->regs)) {
132 dev_err(drm->dev, "Could not remap IO mem\n");
133 return PTR_ERR(arcpgu->regs);
134 }
135
136 dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
137 arc_pgu_read(arcpgu, ARCPGU_REG_ID));
138
139 /* Get the optional framebuffer memory resource */
140 ret = of_reserved_mem_device_init(drm->dev);
141 if (ret && ret != -ENODEV)
142 return ret;
143
144 if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
145 return -ENODEV;
146
147 if (arc_pgu_setup_crtc(drm) < 0)
148 return -ENODEV;
149
150 /* find the encoder node and initialize it */
151 encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
152 if (!encoder_node) {
153 dev_err(drm->dev, "failed to get an encoder slave node\n");
154 return -ENODEV;
155 }
156
157 ret = arcpgu_drm_hdmi_init(drm, encoder_node);
158 if (ret < 0)
159 return ret;
160
161 drm_mode_config_reset(drm);
162 drm_kms_helper_poll_init(drm);
163
164 arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
165 drm->mode_config.num_crtc,
166 drm->mode_config.num_connector);
167 if (IS_ERR(arcpgu->fbdev)) {
168 ret = PTR_ERR(arcpgu->fbdev);
169 arcpgu->fbdev = NULL;
170 return -ENODEV;
171 }
172
173 platform_set_drvdata(pdev, arcpgu);
174 return 0;
175}
176
177int arcpgu_unload(struct drm_device *drm)
178{
179 struct arcpgu_drm_private *arcpgu = drm->dev_private;
180
181 if (arcpgu->fbdev) {
182 drm_fbdev_cma_fini(arcpgu->fbdev);
183 arcpgu->fbdev = NULL;
184 }
185 drm_kms_helper_poll_fini(drm);
186 drm_vblank_cleanup(drm);
187 drm_mode_config_cleanup(drm);
188
189 return 0;
190}
191
192static struct drm_driver arcpgu_drm_driver = {
193 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
194 DRIVER_ATOMIC,
195 .preclose = arcpgu_preclose,
196 .lastclose = arcpgu_lastclose,
197 .name = "drm-arcpgu",
198 .desc = "ARC PGU Controller",
199 .date = "20160219",
200 .major = 1,
201 .minor = 0,
202 .patchlevel = 0,
203 .fops = &arcpgu_drm_ops,
204 .dumb_create = drm_gem_cma_dumb_create,
205 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
206 .dumb_destroy = drm_gem_dumb_destroy,
207 .get_vblank_counter = drm_vblank_no_hw_counter,
208 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
209 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
210 .gem_free_object = drm_gem_cma_free_object,
211 .gem_vm_ops = &drm_gem_cma_vm_ops,
212 .gem_prime_export = drm_gem_prime_export,
213 .gem_prime_import = drm_gem_prime_import,
214 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
215 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
216 .gem_prime_vmap = drm_gem_cma_prime_vmap,
217 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
218 .gem_prime_mmap = drm_gem_cma_prime_mmap,
219};
220
221static int arcpgu_probe(struct platform_device *pdev)
222{
223 struct drm_device *drm;
224 int ret;
225
226 drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
227 if (!drm)
228 return -ENOMEM;
229
230 ret = arcpgu_load(drm);
231 if (ret)
232 goto err_unref;
233
234 ret = drm_dev_register(drm, 0);
235 if (ret)
236 goto err_unload;
237
238 ret = drm_connector_register_all(drm);
239 if (ret)
240 goto err_unregister;
241
242 return 0;
243
244err_unregister:
245 drm_dev_unregister(drm);
246
247err_unload:
248 arcpgu_unload(drm);
249
250err_unref:
251 drm_dev_unref(drm);
252
253 return ret;
254}
255
256static int arcpgu_remove(struct platform_device *pdev)
257{
258 struct drm_device *drm = platform_get_drvdata(pdev);
259
260 drm_connector_unregister_all(drm);
261 drm_dev_unregister(drm);
262 arcpgu_unload(drm);
263 drm_dev_unref(drm);
264
265 return 0;
266}
267
268static const struct of_device_id arcpgu_of_table[] = {
269 {.compatible = "snps,arcpgu"},
270 {}
271};
272
273MODULE_DEVICE_TABLE(of, arcpgu_of_table);
274
275static struct platform_driver arcpgu_platform_driver = {
276 .probe = arcpgu_probe,
277 .remove = arcpgu_remove,
278 .driver = {
279 .name = "arcpgu",
280 .of_match_table = arcpgu_of_table,
281 },
282};
283
284module_platform_driver(arcpgu_platform_driver);
285
286MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
287MODULE_DESCRIPTION("ARC PGU DRM driver");
288MODULE_LICENSE("GPL");