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