1/*
  2 * ARC PGU DRM driver.
  3 *
  4 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
  5 *
  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.
  9 *
 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.
 14 *
 15 */
 16
 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>
 23
 24#include "arcpgu.h"
 25#include "arcpgu_regs.h"
 26
 27static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
 28{
 29	struct arcpgu_drm_private *arcpgu = dev->dev_private;
 30
 31	drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
 32}
 33
 34static 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,
 39};
 40
 41static void arcpgu_setup_mode_config(struct drm_device *drm)
 42{
 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;
 49}
 50
 51static int arcpgu_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 52{
 53	int ret;
 54
 55	ret = drm_gem_mmap(filp, vma);
 56	if (ret)
 57		return ret;
 58
 59	vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
 60	return 0;
 61}
 62
 63static const struct file_operations arcpgu_drm_ops = {
 64	.owner = THIS_MODULE,
 65	.open = drm_open,
 66	.release = drm_release,
 67	.unlocked_ioctl = drm_ioctl,
 68	.compat_ioctl = drm_compat_ioctl,
 69	.poll = drm_poll,
 70	.read = drm_read,
 71	.llseek = no_llseek,
 72	.mmap = arcpgu_gem_mmap,
 73};
 74
 75static void arcpgu_lastclose(struct drm_device *drm)
 76{
 77	struct arcpgu_drm_private *arcpgu = drm->dev_private;
 78
 79	drm_fbdev_cma_restore_mode(arcpgu->fbdev);
 80}
 81
 82static int arcpgu_load(struct drm_device *drm)
 83{
 84	struct platform_device *pdev = to_platform_device(drm->dev);
 85	struct arcpgu_drm_private *arcpgu;
 86	struct device_node *encoder_node;
 87	struct resource *res;
 88	int ret;
 89
 90	arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
 91	if (arcpgu == NULL)
 92		return -ENOMEM;
 93
 94	drm->dev_private = arcpgu;
 95
 96	arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
 97	if (IS_ERR(arcpgu->clk))
 98		return PTR_ERR(arcpgu->clk);
 99
100	arcpgu_setup_mode_config(drm);
101
102	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
103	arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
104	if (IS_ERR(arcpgu->regs))
105		return PTR_ERR(arcpgu->regs);
106
107	dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
108		 arc_pgu_read(arcpgu, ARCPGU_REG_ID));
109
110	/* Get the optional framebuffer memory resource */
111	ret = of_reserved_mem_device_init(drm->dev);
112	if (ret && ret != -ENODEV)
113		return ret;
114
115	if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
116		return -ENODEV;
117
118	if (arc_pgu_setup_crtc(drm) < 0)
119		return -ENODEV;
120
121	/* find the encoder node and initialize it */
122	encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
123	if (encoder_node) {
124		ret = arcpgu_drm_hdmi_init(drm, encoder_node);
125		of_node_put(encoder_node);
126		if (ret < 0)
127			return ret;
128	} else {
129		ret = arcpgu_drm_sim_init(drm, NULL);
130		if (ret < 0)
131			return ret;
132	}
133
134	drm_mode_config_reset(drm);
135	drm_kms_helper_poll_init(drm);
136
137	arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
138					      drm->mode_config.num_crtc,
139					      drm->mode_config.num_connector);
140	if (IS_ERR(arcpgu->fbdev)) {
141		ret = PTR_ERR(arcpgu->fbdev);
142		arcpgu->fbdev = NULL;
143		return -ENODEV;
144	}
145
146	platform_set_drvdata(pdev, arcpgu);
147	return 0;
148}
149
150static int arcpgu_unload(struct drm_device *drm)
151{
152	struct arcpgu_drm_private *arcpgu = drm->dev_private;
153
154	if (arcpgu->fbdev) {
155		drm_fbdev_cma_fini(arcpgu->fbdev);
156		arcpgu->fbdev = NULL;
157	}
158	drm_kms_helper_poll_fini(drm);
159	drm_vblank_cleanup(drm);
160	drm_mode_config_cleanup(drm);
161
162	return 0;
163}
164
165static struct drm_driver arcpgu_drm_driver = {
166	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
167			   DRIVER_ATOMIC,
168	.lastclose = arcpgu_lastclose,
169	.name = "drm-arcpgu",
170	.desc = "ARC PGU Controller",
171	.date = "20160219",
172	.major = 1,
173	.minor = 0,
174	.patchlevel = 0,
175	.fops = &arcpgu_drm_ops,
176	.dumb_create = drm_gem_cma_dumb_create,
177	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
178	.dumb_destroy = drm_gem_dumb_destroy,
179	.get_vblank_counter = drm_vblank_no_hw_counter,
180	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
181	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
182	.gem_free_object_unlocked = drm_gem_cma_free_object,
183	.gem_vm_ops = &drm_gem_cma_vm_ops,
184	.gem_prime_export = drm_gem_prime_export,
185	.gem_prime_import = drm_gem_prime_import,
186	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
187	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
188	.gem_prime_vmap = drm_gem_cma_prime_vmap,
189	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
190	.gem_prime_mmap = drm_gem_cma_prime_mmap,
191};
192
193static int arcpgu_probe(struct platform_device *pdev)
194{
195	struct drm_device *drm;
196	int ret;
197
198	drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
199	if (IS_ERR(drm))
200		return PTR_ERR(drm);
201
202	ret = arcpgu_load(drm);
203	if (ret)
204		goto err_unref;
205
206	ret = drm_dev_register(drm, 0);
207	if (ret)
208		goto err_unload;
209
210	return 0;
211
212err_unload:
213	arcpgu_unload(drm);
214
215err_unref:
216	drm_dev_unref(drm);
217
218	return ret;
219}
220
221static int arcpgu_remove(struct platform_device *pdev)
222{
223	struct drm_device *drm = platform_get_drvdata(pdev);
224
225	drm_dev_unregister(drm);
226	arcpgu_unload(drm);
227	drm_dev_unref(drm);
228
229	return 0;
230}
231
232static const struct of_device_id arcpgu_of_table[] = {
233	{.compatible = "snps,arcpgu"},
234	{}
235};
236
237MODULE_DEVICE_TABLE(of, arcpgu_of_table);
238
239static struct platform_driver arcpgu_platform_driver = {
240	.probe = arcpgu_probe,
241	.remove = arcpgu_remove,
242	.driver = {
243		   .name = "arcpgu",
244		   .of_match_table = arcpgu_of_table,
245		   },
246};
247
248module_platform_driver(arcpgu_platform_driver);
249
250MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
251MODULE_DESCRIPTION("ARC PGU DRM driver");
252MODULE_LICENSE("GPL");