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_gem_framebuffer_helper.h>
22#include <drm/drm_atomic_helper.h>
23#include <linux/of_reserved_mem.h>
24
25#include "arcpgu.h"
26#include "arcpgu_regs.h"
27
28static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
29{
30 struct arcpgu_drm_private *arcpgu = dev->dev_private;
31
32 drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
33}
34
35static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
36 .fb_create = drm_gem_fb_create,
37 .output_poll_changed = arcpgu_fb_output_poll_changed,
38 .atomic_check = drm_atomic_helper_check,
39 .atomic_commit = drm_atomic_helper_commit,
40};
41
42static void arcpgu_setup_mode_config(struct drm_device *drm)
43{
44 drm_mode_config_init(drm);
45 drm->mode_config.min_width = 0;
46 drm->mode_config.min_height = 0;
47 drm->mode_config.max_width = 1920;
48 drm->mode_config.max_height = 1080;
49 drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
50}
51
52DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
53
54static void arcpgu_lastclose(struct drm_device *drm)
55{
56 struct arcpgu_drm_private *arcpgu = drm->dev_private;
57
58 drm_fbdev_cma_restore_mode(arcpgu->fbdev);
59}
60
61static int arcpgu_load(struct drm_device *drm)
62{
63 struct platform_device *pdev = to_platform_device(drm->dev);
64 struct arcpgu_drm_private *arcpgu;
65 struct device_node *encoder_node;
66 struct resource *res;
67 int ret;
68
69 arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
70 if (arcpgu == NULL)
71 return -ENOMEM;
72
73 drm->dev_private = arcpgu;
74
75 arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
76 if (IS_ERR(arcpgu->clk))
77 return PTR_ERR(arcpgu->clk);
78
79 arcpgu_setup_mode_config(drm);
80
81 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
82 arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
83 if (IS_ERR(arcpgu->regs))
84 return PTR_ERR(arcpgu->regs);
85
86 dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
87 arc_pgu_read(arcpgu, ARCPGU_REG_ID));
88
89 /* Get the optional framebuffer memory resource */
90 ret = of_reserved_mem_device_init(drm->dev);
91 if (ret && ret != -ENODEV)
92 return ret;
93
94 if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
95 return -ENODEV;
96
97 if (arc_pgu_setup_crtc(drm) < 0)
98 return -ENODEV;
99
100 /* find the encoder node and initialize it */
101 encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
102 if (encoder_node) {
103 ret = arcpgu_drm_hdmi_init(drm, encoder_node);
104 of_node_put(encoder_node);
105 if (ret < 0)
106 return ret;
107 } else {
108 ret = arcpgu_drm_sim_init(drm, NULL);
109 if (ret < 0)
110 return ret;
111 }
112
113 drm_mode_config_reset(drm);
114 drm_kms_helper_poll_init(drm);
115
116 arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
117 drm->mode_config.num_connector);
118 if (IS_ERR(arcpgu->fbdev)) {
119 ret = PTR_ERR(arcpgu->fbdev);
120 arcpgu->fbdev = NULL;
121 return -ENODEV;
122 }
123
124 platform_set_drvdata(pdev, drm);
125 return 0;
126}
127
128static int arcpgu_unload(struct drm_device *drm)
129{
130 struct arcpgu_drm_private *arcpgu = drm->dev_private;
131
132 if (arcpgu->fbdev) {
133 drm_fbdev_cma_fini(arcpgu->fbdev);
134 arcpgu->fbdev = NULL;
135 }
136 drm_kms_helper_poll_fini(drm);
137 drm_mode_config_cleanup(drm);
138
139 return 0;
140}
141
142#ifdef CONFIG_DEBUG_FS
143static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
144{
145 struct drm_info_node *node = (struct drm_info_node *)m->private;
146 struct drm_device *drm = node->minor->dev;
147 struct arcpgu_drm_private *arcpgu = drm->dev_private;
148 unsigned long clkrate = clk_get_rate(arcpgu->clk);
149 unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;
150
151 seq_printf(m, "hw : %lu\n", clkrate);
152 seq_printf(m, "mode: %lu\n", mode_clock);
153 return 0;
154}
155
156static struct drm_info_list arcpgu_debugfs_list[] = {
157 { "clocks", arcpgu_show_pxlclock, 0 },
158 { "fb", drm_fb_cma_debugfs_show, 0 },
159};
160
161static int arcpgu_debugfs_init(struct drm_minor *minor)
162{
163 return drm_debugfs_create_files(arcpgu_debugfs_list,
164 ARRAY_SIZE(arcpgu_debugfs_list), minor->debugfs_root, minor);
165}
166#endif
167
168static struct drm_driver arcpgu_drm_driver = {
169 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
170 DRIVER_ATOMIC,
171 .lastclose = arcpgu_lastclose,
172 .name = "arcpgu",
173 .desc = "ARC PGU Controller",
174 .date = "20160219",
175 .major = 1,
176 .minor = 0,
177 .patchlevel = 0,
178 .fops = &arcpgu_drm_ops,
179 .dumb_create = drm_gem_cma_dumb_create,
180 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
181 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
182 .gem_free_object_unlocked = drm_gem_cma_free_object,
183 .gem_vm_ops = &drm_gem_cma_vm_ops,
184 .gem_prime_export = drm_gem_prime_export,
185 .gem_prime_import = drm_gem_prime_import,
186 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
187 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
188 .gem_prime_vmap = drm_gem_cma_prime_vmap,
189 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
190 .gem_prime_mmap = drm_gem_cma_prime_mmap,
191#ifdef CONFIG_DEBUG_FS
192 .debugfs_init = arcpgu_debugfs_init,
193#endif
194};
195
196static int arcpgu_probe(struct platform_device *pdev)
197{
198 struct drm_device *drm;
199 int ret;
200
201 drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
202 if (IS_ERR(drm))
203 return PTR_ERR(drm);
204
205 ret = arcpgu_load(drm);
206 if (ret)
207 goto err_unref;
208
209 ret = drm_dev_register(drm, 0);
210 if (ret)
211 goto err_unload;
212
213 return 0;
214
215err_unload:
216 arcpgu_unload(drm);
217
218err_unref:
219 drm_dev_unref(drm);
220
221 return ret;
222}
223
224static int arcpgu_remove(struct platform_device *pdev)
225{
226 struct drm_device *drm = platform_get_drvdata(pdev);
227
228 drm_dev_unregister(drm);
229 arcpgu_unload(drm);
230 drm_dev_unref(drm);
231
232 return 0;
233}
234
235static const struct of_device_id arcpgu_of_table[] = {
236 {.compatible = "snps,arcpgu"},
237 {}
238};
239
240MODULE_DEVICE_TABLE(of, arcpgu_of_table);
241
242static struct platform_driver arcpgu_platform_driver = {
243 .probe = arcpgu_probe,
244 .remove = arcpgu_remove,
245 .driver = {
246 .name = "arcpgu",
247 .of_match_table = arcpgu_of_table,
248 },
249};
250
251module_platform_driver(arcpgu_platform_driver);
252
253MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
254MODULE_DESCRIPTION("ARC PGU DRM driver");
255MODULE_LICENSE("GPL");