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_ATOMIC,
139	.name = "arcpgu",
140	.desc = "ARC PGU Controller",
141	.date = "20160219",
142	.major = 1,
143	.minor = 0,
144	.patchlevel = 0,
145	.fops = &arcpgu_drm_ops,
146	.dumb_create = drm_gem_cma_dumb_create,
147	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
148	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
149	.gem_free_object_unlocked = drm_gem_cma_free_object,
150	.gem_print_info = drm_gem_cma_print_info,
151	.gem_vm_ops = &drm_gem_cma_vm_ops,
152	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
153	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
154	.gem_prime_vmap = drm_gem_cma_prime_vmap,
155	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
156	.gem_prime_mmap = drm_gem_cma_prime_mmap,
157#ifdef CONFIG_DEBUG_FS
158	.debugfs_init = arcpgu_debugfs_init,
159#endif
160};
161
162static int arcpgu_probe(struct platform_device *pdev)
163{
164	struct drm_device *drm;
165	int ret;
166
167	drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
168	if (IS_ERR(drm))
169		return PTR_ERR(drm);
170
171	ret = arcpgu_load(drm);
172	if (ret)
173		goto err_unref;
174
175	ret = drm_dev_register(drm, 0);
176	if (ret)
177		goto err_unload;
178
179	drm_fbdev_generic_setup(drm, 16);
180
181	return 0;
182
183err_unload:
184	arcpgu_unload(drm);
185
186err_unref:
187	drm_dev_put(drm);
188
189	return ret;
190}
191
192static int arcpgu_remove(struct platform_device *pdev)
193{
194	struct drm_device *drm = platform_get_drvdata(pdev);
195
196	drm_dev_unregister(drm);
197	arcpgu_unload(drm);
198	drm_dev_put(drm);
199
200	return 0;
201}
202
203static const struct of_device_id arcpgu_of_table[] = {
204	{.compatible = "snps,arcpgu"},
205	{}
206};
207
208MODULE_DEVICE_TABLE(of, arcpgu_of_table);
209
210static struct platform_driver arcpgu_platform_driver = {
211	.probe = arcpgu_probe,
212	.remove = arcpgu_remove,
213	.driver = {
214		   .name = "arcpgu",
215		   .of_match_table = arcpgu_of_table,
216		   },
217};
218
219module_platform_driver(arcpgu_platform_driver);
220
221MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
222MODULE_DESCRIPTION("ARC PGU DRM driver");
223MODULE_LICENSE("GPL");