4 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
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.
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.
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>
25 #include "arcpgu_regs.h"
27 static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
29 struct arcpgu_drm_private *arcpgu = dev->dev_private;
31 drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
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,
41 static void arcpgu_setup_mode_config(struct drm_device *drm)
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;
51 DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
53 static void arcpgu_lastclose(struct drm_device *drm)
55 struct arcpgu_drm_private *arcpgu = drm->dev_private;
57 drm_fbdev_cma_restore_mode(arcpgu->fbdev);
60 static int arcpgu_load(struct drm_device *drm)
62 struct platform_device *pdev = to_platform_device(drm->dev);
63 struct arcpgu_drm_private *arcpgu;
64 struct device_node *encoder_node;
68 arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
72 drm->dev_private = arcpgu;
74 arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
75 if (IS_ERR(arcpgu->clk))
76 return PTR_ERR(arcpgu->clk);
78 arcpgu_setup_mode_config(drm);
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);
85 dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
86 arc_pgu_read(arcpgu, ARCPGU_REG_ID));
88 /* Get the optional framebuffer memory resource */
89 ret = of_reserved_mem_device_init(drm->dev);
90 if (ret && ret != -ENODEV)
93 if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
96 if (arc_pgu_setup_crtc(drm) < 0)
99 /* find the encoder node and initialize it */
100 encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
102 ret = arcpgu_drm_hdmi_init(drm, encoder_node);
103 of_node_put(encoder_node);
107 ret = arcpgu_drm_sim_init(drm, NULL);
112 drm_mode_config_reset(drm);
113 drm_kms_helper_poll_init(drm);
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;
123 platform_set_drvdata(pdev, drm);
127 static int arcpgu_unload(struct drm_device *drm)
129 struct arcpgu_drm_private *arcpgu = drm->dev_private;
132 drm_fbdev_cma_fini(arcpgu->fbdev);
133 arcpgu->fbdev = NULL;
135 drm_kms_helper_poll_fini(drm);
136 drm_mode_config_cleanup(drm);
141 #ifdef CONFIG_DEBUG_FS
142 static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
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;
150 seq_printf(m, "hw : %lu\n", clkrate);
151 seq_printf(m, "mode: %lu\n", mode_clock);
155 static struct drm_info_list arcpgu_debugfs_list[] = {
156 { "clocks", arcpgu_show_pxlclock, 0 },
157 { "fb", drm_fb_cma_debugfs_show, 0 },
160 static int arcpgu_debugfs_init(struct drm_minor *minor)
162 return drm_debugfs_create_files(arcpgu_debugfs_list,
163 ARRAY_SIZE(arcpgu_debugfs_list), minor->debugfs_root, minor);
167 static struct drm_driver arcpgu_drm_driver = {
168 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
170 .lastclose = arcpgu_lastclose,
172 .desc = "ARC PGU Controller",
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,
195 static int arcpgu_probe(struct platform_device *pdev)
197 struct drm_device *drm;
200 drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
204 ret = arcpgu_load(drm);
208 ret = drm_dev_register(drm, 0);
223 static int arcpgu_remove(struct platform_device *pdev)
225 struct drm_device *drm = platform_get_drvdata(pdev);
227 drm_dev_unregister(drm);
234 static const struct of_device_id arcpgu_of_table[] = {
235 {.compatible = "snps,arcpgu"},
239 MODULE_DEVICE_TABLE(of, arcpgu_of_table);
241 static struct platform_driver arcpgu_platform_driver = {
242 .probe = arcpgu_probe,
243 .remove = arcpgu_remove,
246 .of_match_table = arcpgu_of_table,
250 module_platform_driver(arcpgu_platform_driver);
252 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
253 MODULE_DESCRIPTION("ARC PGU DRM driver");
254 MODULE_LICENSE("GPL");