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_of.h>
18 #include <drm/drm_probe_helper.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/module.h>
21 #include <linux/of_reserved_mem.h>
22 #include <linux/platform_device.h>
23
24 #include "arcpgu.h"
25 #include "arcpgu_regs.h"
26
27 static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
28 .fb_create = drm_gem_fb_create,
29 .atomic_check = drm_atomic_helper_check,
30 .atomic_commit = drm_atomic_helper_commit,
31 };
32
arcpgu_setup_mode_config(struct drm_device * drm)33 static void arcpgu_setup_mode_config(struct drm_device *drm)
34 {
35 drm_mode_config_init(drm);
36 drm->mode_config.min_width = 0;
37 drm->mode_config.min_height = 0;
38 drm->mode_config.max_width = 1920;
39 drm->mode_config.max_height = 1080;
40 drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
41 }
42
43 DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
44
arcpgu_load(struct drm_device * drm)45 static int arcpgu_load(struct drm_device *drm)
46 {
47 struct platform_device *pdev = to_platform_device(drm->dev);
48 struct arcpgu_drm_private *arcpgu;
49 struct device_node *encoder_node = NULL, *endpoint_node = NULL;
50 struct resource *res;
51 int ret;
52
53 arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
54 if (arcpgu == NULL)
55 return -ENOMEM;
56
57 drm->dev_private = arcpgu;
58
59 arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
60 if (IS_ERR(arcpgu->clk))
61 return PTR_ERR(arcpgu->clk);
62
63 arcpgu_setup_mode_config(drm);
64
65 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
66 arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
67 if (IS_ERR(arcpgu->regs))
68 return PTR_ERR(arcpgu->regs);
69
70 dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
71 arc_pgu_read(arcpgu, ARCPGU_REG_ID));
72
73 /* Get the optional framebuffer memory resource */
74 ret = of_reserved_mem_device_init(drm->dev);
75 if (ret && ret != -ENODEV)
76 return ret;
77
78 if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
79 return -ENODEV;
80
81 if (arc_pgu_setup_crtc(drm) < 0)
82 return -ENODEV;
83
84 /*
85 * There is only one output port inside each device. It is linked with
86 * encoder endpoint.
87 */
88 endpoint_node = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
89 if (endpoint_node) {
90 encoder_node = of_graph_get_remote_port_parent(endpoint_node);
91 of_node_put(endpoint_node);
92 }
93
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 dev_info(drm->dev, "no encoder found. Assumed virtual LCD on simulation platform\n");
101 ret = arcpgu_drm_sim_init(drm, NULL);
102 if (ret < 0)
103 return ret;
104 }
105
106 drm_mode_config_reset(drm);
107 drm_kms_helper_poll_init(drm);
108
109 platform_set_drvdata(pdev, drm);
110 return 0;
111 }
112
arcpgu_unload(struct drm_device * drm)113 static int arcpgu_unload(struct drm_device *drm)
114 {
115 drm_kms_helper_poll_fini(drm);
116 drm_atomic_helper_shutdown(drm);
117 drm_mode_config_cleanup(drm);
118
119 return 0;
120 }
121
122 #ifdef CONFIG_DEBUG_FS
arcpgu_show_pxlclock(struct seq_file * m,void * arg)123 static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
124 {
125 struct drm_info_node *node = (struct drm_info_node *)m->private;
126 struct drm_device *drm = node->minor->dev;
127 struct arcpgu_drm_private *arcpgu = drm->dev_private;
128 unsigned long clkrate = clk_get_rate(arcpgu->clk);
129 unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;
130
131 seq_printf(m, "hw : %lu\n", clkrate);
132 seq_printf(m, "mode: %lu\n", mode_clock);
133 return 0;
134 }
135
136 static struct drm_info_list arcpgu_debugfs_list[] = {
137 { "clocks", arcpgu_show_pxlclock, 0 },
138 };
139
arcpgu_debugfs_init(struct drm_minor * minor)140 static void arcpgu_debugfs_init(struct drm_minor *minor)
141 {
142 drm_debugfs_create_files(arcpgu_debugfs_list,
143 ARRAY_SIZE(arcpgu_debugfs_list),
144 minor->debugfs_root, minor);
145 }
146 #endif
147
148 static struct drm_driver arcpgu_drm_driver = {
149 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
150 .name = "arcpgu",
151 .desc = "ARC PGU Controller",
152 .date = "20160219",
153 .major = 1,
154 .minor = 0,
155 .patchlevel = 0,
156 .fops = &arcpgu_drm_ops,
157 DRM_GEM_CMA_DRIVER_OPS,
158 #ifdef CONFIG_DEBUG_FS
159 .debugfs_init = arcpgu_debugfs_init,
160 #endif
161 };
162
arcpgu_probe(struct platform_device * pdev)163 static int arcpgu_probe(struct platform_device *pdev)
164 {
165 struct drm_device *drm;
166 int ret;
167
168 drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
169 if (IS_ERR(drm))
170 return PTR_ERR(drm);
171
172 ret = arcpgu_load(drm);
173 if (ret)
174 goto err_unref;
175
176 ret = drm_dev_register(drm, 0);
177 if (ret)
178 goto err_unload;
179
180 drm_fbdev_generic_setup(drm, 16);
181
182 return 0;
183
184 err_unload:
185 arcpgu_unload(drm);
186
187 err_unref:
188 drm_dev_put(drm);
189
190 return ret;
191 }
192
arcpgu_remove(struct platform_device * pdev)193 static int arcpgu_remove(struct platform_device *pdev)
194 {
195 struct drm_device *drm = platform_get_drvdata(pdev);
196
197 drm_dev_unregister(drm);
198 arcpgu_unload(drm);
199 drm_dev_put(drm);
200
201 return 0;
202 }
203
204 static const struct of_device_id arcpgu_of_table[] = {
205 {.compatible = "snps,arcpgu"},
206 {}
207 };
208
209 MODULE_DEVICE_TABLE(of, arcpgu_of_table);
210
211 static struct platform_driver arcpgu_platform_driver = {
212 .probe = arcpgu_probe,
213 .remove = arcpgu_remove,
214 .driver = {
215 .name = "arcpgu",
216 .of_match_table = arcpgu_of_table,
217 },
218 };
219
220 module_platform_driver(arcpgu_platform_driver);
221
222 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
223 MODULE_DESCRIPTION("ARC PGU DRM driver");
224 MODULE_LICENSE("GPL");
225