1/*
2 * rcar_du_drv.c  --  R-Car Display Unit DRM driver
3 *
4 * Copyright (C) 2013-2014 Renesas Electronics Corporation
5 *
6 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#include <linux/clk.h>
15#include <linux/io.h>
16#include <linux/mm.h>
17#include <linux/module.h>
18#include <linux/of_device.h>
19#include <linux/platform_device.h>
20#include <linux/pm.h>
21#include <linux/slab.h>
22#include <linux/wait.h>
23
24#include <drm/drmP.h>
25#include <drm/drm_crtc_helper.h>
26#include <drm/drm_fb_cma_helper.h>
27#include <drm/drm_gem_cma_helper.h>
28
29#include "rcar_du_crtc.h"
30#include "rcar_du_drv.h"
31#include "rcar_du_kms.h"
32#include "rcar_du_regs.h"
33
34/* -----------------------------------------------------------------------------
35 * Device Information
36 */
37
38static const struct rcar_du_device_info rcar_du_r8a7779_info = {
39	.features = 0,
40	.num_crtcs = 2,
41	.routes = {
42		/* R8A7779 has two RGB outputs and one (currently unsupported)
43		 * TCON output.
44		 */
45		[RCAR_DU_OUTPUT_DPAD0] = {
46			.possible_crtcs = BIT(0),
47			.encoder_type = DRM_MODE_ENCODER_NONE,
48			.port = 0,
49		},
50		[RCAR_DU_OUTPUT_DPAD1] = {
51			.possible_crtcs = BIT(1) | BIT(0),
52			.encoder_type = DRM_MODE_ENCODER_NONE,
53			.port = 1,
54		},
55	},
56	.num_lvds = 0,
57};
58
59static const struct rcar_du_device_info rcar_du_r8a7790_info = {
60	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
61		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
62	.quirks = RCAR_DU_QUIRK_ALIGN_128B | RCAR_DU_QUIRK_LVDS_LANES,
63	.num_crtcs = 3,
64	.routes = {
65		/* R8A7790 has one RGB output, two LVDS outputs and one
66		 * (currently unsupported) TCON output.
67		 */
68		[RCAR_DU_OUTPUT_DPAD0] = {
69			.possible_crtcs = BIT(2) | BIT(1) | BIT(0),
70			.encoder_type = DRM_MODE_ENCODER_NONE,
71			.port = 0,
72		},
73		[RCAR_DU_OUTPUT_LVDS0] = {
74			.possible_crtcs = BIT(0),
75			.encoder_type = DRM_MODE_ENCODER_LVDS,
76			.port = 1,
77		},
78		[RCAR_DU_OUTPUT_LVDS1] = {
79			.possible_crtcs = BIT(2) | BIT(1),
80			.encoder_type = DRM_MODE_ENCODER_LVDS,
81			.port = 2,
82		},
83	},
84	.num_lvds = 2,
85};
86
87static const struct rcar_du_device_info rcar_du_r8a7791_info = {
88	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
89		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
90	.num_crtcs = 2,
91	.routes = {
92		/* R8A7791 has one RGB output, one LVDS output and one
93		 * (currently unsupported) TCON output.
94		 */
95		[RCAR_DU_OUTPUT_DPAD0] = {
96			.possible_crtcs = BIT(1),
97			.encoder_type = DRM_MODE_ENCODER_NONE,
98			.port = 0,
99		},
100		[RCAR_DU_OUTPUT_LVDS0] = {
101			.possible_crtcs = BIT(0),
102			.encoder_type = DRM_MODE_ENCODER_LVDS,
103			.port = 1,
104		},
105	},
106	.num_lvds = 1,
107};
108
109static const struct platform_device_id rcar_du_id_table[] = {
110	{ "rcar-du-r8a7779", (kernel_ulong_t)&rcar_du_r8a7779_info },
111	{ "rcar-du-r8a7790", (kernel_ulong_t)&rcar_du_r8a7790_info },
112	{ "rcar-du-r8a7791", (kernel_ulong_t)&rcar_du_r8a7791_info },
113	{ }
114};
115
116MODULE_DEVICE_TABLE(platform, rcar_du_id_table);
117
118static const struct of_device_id rcar_du_of_table[] = {
119	{ .compatible = "renesas,du-r8a7779", .data = &rcar_du_r8a7779_info },
120	{ .compatible = "renesas,du-r8a7790", .data = &rcar_du_r8a7790_info },
121	{ .compatible = "renesas,du-r8a7791", .data = &rcar_du_r8a7791_info },
122	{ }
123};
124
125MODULE_DEVICE_TABLE(of, rcar_du_of_table);
126
127/* -----------------------------------------------------------------------------
128 * DRM operations
129 */
130
131static int rcar_du_unload(struct drm_device *dev)
132{
133	struct rcar_du_device *rcdu = dev->dev_private;
134
135	if (rcdu->fbdev)
136		drm_fbdev_cma_fini(rcdu->fbdev);
137
138	drm_kms_helper_poll_fini(dev);
139	drm_mode_config_cleanup(dev);
140	drm_vblank_cleanup(dev);
141
142	dev->irq_enabled = 0;
143	dev->dev_private = NULL;
144
145	return 0;
146}
147
148static int rcar_du_load(struct drm_device *dev, unsigned long flags)
149{
150	struct platform_device *pdev = dev->platformdev;
151	struct device_node *np = pdev->dev.of_node;
152	struct rcar_du_device *rcdu;
153	struct resource *mem;
154	int ret;
155
156	if (np == NULL) {
157		dev_err(dev->dev, "no platform data\n");
158		return -ENODEV;
159	}
160
161	rcdu = devm_kzalloc(&pdev->dev, sizeof(*rcdu), GFP_KERNEL);
162	if (rcdu == NULL) {
163		dev_err(dev->dev, "failed to allocate private data\n");
164		return -ENOMEM;
165	}
166
167	init_waitqueue_head(&rcdu->commit.wait);
168
169	rcdu->dev = &pdev->dev;
170	rcdu->info = np ? of_match_device(rcar_du_of_table, rcdu->dev)->data
171		   : (void *)platform_get_device_id(pdev)->driver_data;
172	rcdu->ddev = dev;
173	dev->dev_private = rcdu;
174
175	/* I/O resources */
176	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
177	rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem);
178	if (IS_ERR(rcdu->mmio))
179		return PTR_ERR(rcdu->mmio);
180
181	/* Initialize vertical blanking interrupts handling. Start with vblank
182	 * disabled for all CRTCs.
183	 */
184	ret = drm_vblank_init(dev, (1 << rcdu->info->num_crtcs) - 1);
185	if (ret < 0) {
186		dev_err(&pdev->dev, "failed to initialize vblank\n");
187		goto done;
188	}
189
190	/* DRM/KMS objects */
191	ret = rcar_du_modeset_init(rcdu);
192	if (ret < 0) {
193		dev_err(&pdev->dev, "failed to initialize DRM/KMS\n");
194		goto done;
195	}
196
197	dev->irq_enabled = 1;
198
199	platform_set_drvdata(pdev, rcdu);
200
201done:
202	if (ret)
203		rcar_du_unload(dev);
204
205	return ret;
206}
207
208static void rcar_du_preclose(struct drm_device *dev, struct drm_file *file)
209{
210	struct rcar_du_device *rcdu = dev->dev_private;
211	unsigned int i;
212
213	for (i = 0; i < rcdu->num_crtcs; ++i)
214		rcar_du_crtc_cancel_page_flip(&rcdu->crtcs[i], file);
215}
216
217static void rcar_du_lastclose(struct drm_device *dev)
218{
219	struct rcar_du_device *rcdu = dev->dev_private;
220
221	drm_fbdev_cma_restore_mode(rcdu->fbdev);
222}
223
224static int rcar_du_enable_vblank(struct drm_device *dev, int crtc)
225{
226	struct rcar_du_device *rcdu = dev->dev_private;
227
228	rcar_du_crtc_enable_vblank(&rcdu->crtcs[crtc], true);
229
230	return 0;
231}
232
233static void rcar_du_disable_vblank(struct drm_device *dev, int crtc)
234{
235	struct rcar_du_device *rcdu = dev->dev_private;
236
237	rcar_du_crtc_enable_vblank(&rcdu->crtcs[crtc], false);
238}
239
240static const struct file_operations rcar_du_fops = {
241	.owner		= THIS_MODULE,
242	.open		= drm_open,
243	.release	= drm_release,
244	.unlocked_ioctl	= drm_ioctl,
245#ifdef CONFIG_COMPAT
246	.compat_ioctl	= drm_compat_ioctl,
247#endif
248	.poll		= drm_poll,
249	.read		= drm_read,
250	.llseek		= no_llseek,
251	.mmap		= drm_gem_cma_mmap,
252};
253
254static struct drm_driver rcar_du_driver = {
255	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME
256				| DRIVER_ATOMIC,
257	.load			= rcar_du_load,
258	.unload			= rcar_du_unload,
259	.preclose		= rcar_du_preclose,
260	.lastclose		= rcar_du_lastclose,
261	.set_busid		= drm_platform_set_busid,
262	.get_vblank_counter	= drm_vblank_count,
263	.enable_vblank		= rcar_du_enable_vblank,
264	.disable_vblank		= rcar_du_disable_vblank,
265	.gem_free_object	= drm_gem_cma_free_object,
266	.gem_vm_ops		= &drm_gem_cma_vm_ops,
267	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
268	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
269	.gem_prime_import	= drm_gem_prime_import,
270	.gem_prime_export	= drm_gem_prime_export,
271	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
272	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
273	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
274	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
275	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
276	.dumb_create		= rcar_du_dumb_create,
277	.dumb_map_offset	= drm_gem_cma_dumb_map_offset,
278	.dumb_destroy		= drm_gem_dumb_destroy,
279	.fops			= &rcar_du_fops,
280	.name			= "rcar-du",
281	.desc			= "Renesas R-Car Display Unit",
282	.date			= "20130110",
283	.major			= 1,
284	.minor			= 0,
285};
286
287/* -----------------------------------------------------------------------------
288 * Power management
289 */
290
291#ifdef CONFIG_PM_SLEEP
292static int rcar_du_pm_suspend(struct device *dev)
293{
294	struct rcar_du_device *rcdu = dev_get_drvdata(dev);
295
296	drm_kms_helper_poll_disable(rcdu->ddev);
297	/* TODO Suspend the CRTC */
298
299	return 0;
300}
301
302static int rcar_du_pm_resume(struct device *dev)
303{
304	struct rcar_du_device *rcdu = dev_get_drvdata(dev);
305
306	/* TODO Resume the CRTC */
307
308	drm_kms_helper_poll_enable(rcdu->ddev);
309	return 0;
310}
311#endif
312
313static const struct dev_pm_ops rcar_du_pm_ops = {
314	SET_SYSTEM_SLEEP_PM_OPS(rcar_du_pm_suspend, rcar_du_pm_resume)
315};
316
317/* -----------------------------------------------------------------------------
318 * Platform driver
319 */
320
321static int rcar_du_probe(struct platform_device *pdev)
322{
323	return drm_platform_init(&rcar_du_driver, pdev);
324}
325
326static int rcar_du_remove(struct platform_device *pdev)
327{
328	struct rcar_du_device *rcdu = platform_get_drvdata(pdev);
329
330	drm_put_dev(rcdu->ddev);
331
332	return 0;
333}
334
335static struct platform_driver rcar_du_platform_driver = {
336	.probe		= rcar_du_probe,
337	.remove		= rcar_du_remove,
338	.driver		= {
339		.name	= "rcar-du",
340		.pm	= &rcar_du_pm_ops,
341		.of_match_table = rcar_du_of_table,
342	},
343	.id_table	= rcar_du_id_table,
344};
345
346module_platform_driver(rcar_du_platform_driver);
347
348MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
349MODULE_DESCRIPTION("Renesas R-Car Display Unit DRM Driver");
350MODULE_LICENSE("GPL");
351