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
 27static 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
 33static 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
 43DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
 44
 45static 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
113static 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
123static 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
136static struct drm_info_list arcpgu_debugfs_list[] = {
137	{ "clocks", arcpgu_show_pxlclock, 0 },
138};
139
140static 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
148static 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
163static 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
184err_unload:
185	arcpgu_unload(drm);
186
187err_unref:
188	drm_dev_put(drm);
189
190	return ret;
191}
192
193static 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
204static const struct of_device_id arcpgu_of_table[] = {
205	{.compatible = "snps,arcpgu"},
206	{}
207};
208
209MODULE_DEVICE_TABLE(of, arcpgu_of_table);
210
211static 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
220module_platform_driver(arcpgu_platform_driver);
221
222MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
223MODULE_DESCRIPTION("ARC PGU DRM driver");
224MODULE_LICENSE("GPL");