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