tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ARC PGU DRM driver.
4 *
5 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
6 */
7
8#include <linux/clk.h>
9#include <drm/drm_atomic_helper.h>
10#include <drm/drm_debugfs.h>
11#include <drm/drm_device.h>
12#include <drm/drm_drv.h>
13#include <drm/drm_fb_cma_helper.h>
14#include <drm/drm_fb_helper.h>
15#include <drm/drm_gem_cma_helper.h>
16#include <drm/drm_gem_framebuffer_helper.h>
17#include <drm/drm_probe_helper.h>
18#include <linux/dma-mapping.h>
19#include <linux/module.h>
20#include <linux/of_reserved_mem.h>
21#include <linux/platform_device.h>
22
23#include "arcpgu.h"
24#include "arcpgu_regs.h"
25
26static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
27 .fb_create = drm_gem_fb_create,
28 .atomic_check = drm_atomic_helper_check,
29 .atomic_commit = drm_atomic_helper_commit,
30};
31
32static void arcpgu_setup_mode_config(struct drm_device *drm)
33{
34 drm_mode_config_init(drm);
35 drm->mode_config.min_width = 0;
36 drm->mode_config.min_height = 0;
37 drm->mode_config.max_width = 1920;
38 drm->mode_config.max_height = 1080;
39 drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
40}
41
42DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
43
44static int arcpgu_load(struct drm_device *drm)
45{
46 struct platform_device *pdev = to_platform_device(drm->dev);
47 struct arcpgu_drm_private *arcpgu;
48 struct device_node *encoder_node;
49 struct resource *res;
50 int ret;
51
52 arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
53 if (arcpgu == NULL)
54 return -ENOMEM;
55
56 drm->dev_private = arcpgu;
57
58 arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
59 if (IS_ERR(arcpgu->clk))
60 return PTR_ERR(arcpgu->clk);
61
62 arcpgu_setup_mode_config(drm);
63
64 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
65 arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
66 if (IS_ERR(arcpgu->regs))
67 return PTR_ERR(arcpgu->regs);
68
69 dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
70 arc_pgu_read(arcpgu, ARCPGU_REG_ID));
71
72 /* Get the optional framebuffer memory resource */
73 ret = of_reserved_mem_device_init(drm->dev);
74 if (ret && ret != -ENODEV)
75 return ret;
76
77 if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
78 return -ENODEV;
79
80 if (arc_pgu_setup_crtc(drm) < 0)
81 return -ENODEV;
82
83 /* find the encoder node and initialize it */
84 encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
85 if (encoder_node) {
86 ret = arcpgu_drm_hdmi_init(drm, encoder_node);
87 of_node_put(encoder_node);
88 if (ret < 0)
89 return ret;
90 } else {
91 ret = arcpgu_drm_sim_init(drm, NULL);
92 if (ret < 0)
93 return ret;
94 }
95
96 drm_mode_config_reset(drm);
97 drm_kms_helper_poll_init(drm);
98
99 platform_set_drvdata(pdev, drm);
100 return 0;
101}
102
103static int arcpgu_unload(struct drm_device *drm)
104{
105 drm_kms_helper_poll_fini(drm);
106 drm_atomic_helper_shutdown(drm);
107 drm_mode_config_cleanup(drm);
108
109 return 0;
110}
111
112#ifdef CONFIG_DEBUG_FS
113static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
114{
115 struct drm_info_node *node = (struct drm_info_node *)m->private;
116 struct drm_device *drm = node->minor->dev;
117 struct arcpgu_drm_private *arcpgu = drm->dev_private;
118 unsigned long clkrate = clk_get_rate(arcpgu->clk);
119 unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;
120
121 seq_printf(m, "hw : %lu\n", clkrate);
122 seq_printf(m, "mode: %lu\n", mode_clock);
123 return 0;
124}
125
126static struct drm_info_list arcpgu_debugfs_list[] = {
127 { "clocks", arcpgu_show_pxlclock, 0 },
128};
129
130static int arcpgu_debugfs_init(struct drm_minor *minor)
131{
132 return drm_debugfs_create_files(arcpgu_debugfs_list,
133 ARRAY_SIZE(arcpgu_debugfs_list), minor->debugfs_root, minor);
134}
135#endif
136
137static struct drm_driver arcpgu_drm_driver = {
138 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
139 DRIVER_ATOMIC,
140 .name = "arcpgu",
141 .desc = "ARC PGU Controller",
142 .date = "20160219",
143 .major = 1,
144 .minor = 0,
145 .patchlevel = 0,
146 .fops = &arcpgu_drm_ops,
147 .dumb_create = drm_gem_cma_dumb_create,
148 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
149 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
150 .gem_free_object_unlocked = drm_gem_cma_free_object,
151 .gem_print_info = drm_gem_cma_print_info,
152 .gem_vm_ops = &drm_gem_cma_vm_ops,
153 .gem_prime_export = drm_gem_prime_export,
154 .gem_prime_import = drm_gem_prime_import,
155 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
156 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
157 .gem_prime_vmap = drm_gem_cma_prime_vmap,
158 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
159 .gem_prime_mmap = drm_gem_cma_prime_mmap,
160#ifdef CONFIG_DEBUG_FS
161 .debugfs_init = arcpgu_debugfs_init,
162#endif
163};
164
165static int arcpgu_probe(struct platform_device *pdev)
166{
167 struct drm_device *drm;
168 int ret;
169
170 drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
171 if (IS_ERR(drm))
172 return PTR_ERR(drm);
173
174 ret = arcpgu_load(drm);
175 if (ret)
176 goto err_unref;
177
178 ret = drm_dev_register(drm, 0);
179 if (ret)
180 goto err_unload;
181
182 drm_fbdev_generic_setup(drm, 16);
183
184 return 0;
185
186err_unload:
187 arcpgu_unload(drm);
188
189err_unref:
190 drm_dev_put(drm);
191
192 return ret;
193}
194
195static int arcpgu_remove(struct platform_device *pdev)
196{
197 struct drm_device *drm = platform_get_drvdata(pdev);
198
199 drm_dev_unregister(drm);
200 arcpgu_unload(drm);
201 drm_dev_put(drm);
202
203 return 0;
204}
205
206static const struct of_device_id arcpgu_of_table[] = {
207 {.compatible = "snps,arcpgu"},
208 {}
209};
210
211MODULE_DEVICE_TABLE(of, arcpgu_of_table);
212
213static struct platform_driver arcpgu_platform_driver = {
214 .probe = arcpgu_probe,
215 .remove = arcpgu_remove,
216 .driver = {
217 .name = "arcpgu",
218 .of_match_table = arcpgu_of_table,
219 },
220};
221
222module_platform_driver(arcpgu_platform_driver);
223
224MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
225MODULE_DESCRIPTION("ARC PGU DRM driver");
226MODULE_LICENSE("GPL");