1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * shmob_drm_drv.c  --  SH Mobile DRM driver
4 *
5 * Copyright (C) 2012 Renesas Electronics Corporation
6 *
7 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
8 */
9
10#include <linux/clk.h>
11#include <linux/io.h>
12#include <linux/mm.h>
13#include <linux/module.h>
14#include <linux/platform_device.h>
15#include <linux/pm.h>
16#include <linux/slab.h>
17
18#include <drm/drm_crtc_helper.h>
19#include <drm/drm_drv.h>
20#include <drm/drm_gem_cma_helper.h>
21#include <drm/drm_irq.h>
22#include <drm/drm_probe_helper.h>
23#include <drm/drm_vblank.h>
24
25#include "shmob_drm_drv.h"
26#include "shmob_drm_kms.h"
27#include "shmob_drm_plane.h"
28#include "shmob_drm_regs.h"
29
30/* -----------------------------------------------------------------------------
31 * Hardware initialization
32 */
33
34static int shmob_drm_init_interface(struct shmob_drm_device *sdev)
35{
36	static const u32 ldmt1r[] = {
37		[SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
38		[SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
39		[SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
40		[SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
41		[SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
42		[SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
43		[SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
44		[SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
45		[SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
46		[SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
47		[SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
48		[SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
49		[SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
50		[SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
51		[SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
52		[SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
53		[SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
54		[SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
55		[SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
56	};
57
58	if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
59		dev_err(sdev->dev, "invalid interface type %u\n",
60			sdev->pdata->iface.interface);
61		return -EINVAL;
62	}
63
64	sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
65	return 0;
66}
67
68static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
69					    enum shmob_drm_clk_source clksrc)
70{
71	struct clk *clk;
72	char *clkname;
73
74	switch (clksrc) {
75	case SHMOB_DRM_CLK_BUS:
76		clkname = "bus_clk";
77		sdev->lddckr = LDDCKR_ICKSEL_BUS;
78		break;
79	case SHMOB_DRM_CLK_PERIPHERAL:
80		clkname = "peripheral_clk";
81		sdev->lddckr = LDDCKR_ICKSEL_MIPI;
82		break;
83	case SHMOB_DRM_CLK_EXTERNAL:
84		clkname = NULL;
85		sdev->lddckr = LDDCKR_ICKSEL_HDMI;
86		break;
87	default:
88		return -EINVAL;
89	}
90
91	clk = devm_clk_get(sdev->dev, clkname);
92	if (IS_ERR(clk)) {
93		dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
94		return PTR_ERR(clk);
95	}
96
97	sdev->clock = clk;
98	return 0;
99}
100
101/* -----------------------------------------------------------------------------
102 * DRM operations
103 */
104
105static irqreturn_t shmob_drm_irq(int irq, void *arg)
106{
107	struct drm_device *dev = arg;
108	struct shmob_drm_device *sdev = dev->dev_private;
109	unsigned long flags;
110	u32 status;
111
112	/* Acknowledge interrupts. Putting interrupt enable and interrupt flag
113	 * bits in the same register is really brain-dead design and requires
114	 * taking a spinlock.
115	 */
116	spin_lock_irqsave(&sdev->irq_lock, flags);
117	status = lcdc_read(sdev, LDINTR);
118	lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
119	spin_unlock_irqrestore(&sdev->irq_lock, flags);
120
121	if (status & LDINTR_VES) {
122		drm_handle_vblank(dev, 0);
123		shmob_drm_crtc_finish_page_flip(&sdev->crtc);
124	}
125
126	return IRQ_HANDLED;
127}
128
129DEFINE_DRM_GEM_CMA_FOPS(shmob_drm_fops);
130
131static struct drm_driver shmob_drm_driver = {
132	.driver_features	= DRIVER_GEM | DRIVER_MODESET,
133	.irq_handler		= shmob_drm_irq,
134	DRM_GEM_CMA_DRIVER_OPS,
135	.fops			= &shmob_drm_fops,
136	.name			= "shmob-drm",
137	.desc			= "Renesas SH Mobile DRM",
138	.date			= "20120424",
139	.major			= 1,
140	.minor			= 0,
141};
142
143/* -----------------------------------------------------------------------------
144 * Power management
145 */
146
147#ifdef CONFIG_PM_SLEEP
148static int shmob_drm_pm_suspend(struct device *dev)
149{
150	struct shmob_drm_device *sdev = dev_get_drvdata(dev);
151
152	drm_kms_helper_poll_disable(sdev->ddev);
153	shmob_drm_crtc_suspend(&sdev->crtc);
154
155	return 0;
156}
157
158static int shmob_drm_pm_resume(struct device *dev)
159{
160	struct shmob_drm_device *sdev = dev_get_drvdata(dev);
161
162	drm_modeset_lock_all(sdev->ddev);
163	shmob_drm_crtc_resume(&sdev->crtc);
164	drm_modeset_unlock_all(sdev->ddev);
165
166	drm_kms_helper_poll_enable(sdev->ddev);
167	return 0;
168}
169#endif
170
171static const struct dev_pm_ops shmob_drm_pm_ops = {
172	SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
173};
174
175/* -----------------------------------------------------------------------------
176 * Platform driver
177 */
178
179static int shmob_drm_remove(struct platform_device *pdev)
180{
181	struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
182	struct drm_device *ddev = sdev->ddev;
183
184	drm_dev_unregister(ddev);
185	drm_kms_helper_poll_fini(ddev);
186	drm_irq_uninstall(ddev);
187	drm_dev_put(ddev);
188
189	return 0;
190}
191
192static int shmob_drm_probe(struct platform_device *pdev)
193{
194	struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
195	struct shmob_drm_device *sdev;
196	struct drm_device *ddev;
197	struct resource *res;
198	unsigned int i;
199	int ret;
200
201	if (pdata == NULL) {
202		dev_err(&pdev->dev, "no platform data\n");
203		return -EINVAL;
204	}
205
206	/*
207	 * Allocate and initialize the driver private data, I/O resources and
208	 * clocks.
209	 */
210	sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
211	if (sdev == NULL)
212		return -ENOMEM;
213
214	sdev->dev = &pdev->dev;
215	sdev->pdata = pdata;
216	spin_lock_init(&sdev->irq_lock);
217
218	platform_set_drvdata(pdev, sdev);
219
220	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
221	sdev->mmio = devm_ioremap_resource(&pdev->dev, res);
222	if (IS_ERR(sdev->mmio))
223		return PTR_ERR(sdev->mmio);
224
225	ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
226	if (ret < 0)
227		return ret;
228
229	ret = shmob_drm_init_interface(sdev);
230	if (ret < 0)
231		return ret;
232
233	/* Allocate and initialize the DRM device. */
234	ddev = drm_dev_alloc(&shmob_drm_driver, &pdev->dev);
235	if (IS_ERR(ddev))
236		return PTR_ERR(ddev);
237
238	sdev->ddev = ddev;
239	ddev->dev_private = sdev;
240
241	ret = shmob_drm_modeset_init(sdev);
242	if (ret < 0) {
243		dev_err(&pdev->dev, "failed to initialize mode setting\n");
244		goto err_free_drm_dev;
245	}
246
247	for (i = 0; i < 4; ++i) {
248		ret = shmob_drm_plane_create(sdev, i);
249		if (ret < 0) {
250			dev_err(&pdev->dev, "failed to create plane %u\n", i);
251			goto err_modeset_cleanup;
252		}
253	}
254
255	ret = drm_vblank_init(ddev, 1);
256	if (ret < 0) {
257		dev_err(&pdev->dev, "failed to initialize vblank\n");
258		goto err_modeset_cleanup;
259	}
260
261	ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
262	if (ret < 0) {
263		dev_err(&pdev->dev, "failed to install IRQ handler\n");
264		goto err_modeset_cleanup;
265	}
266
267	/*
268	 * Register the DRM device with the core and the connectors with
269	 * sysfs.
270	 */
271	ret = drm_dev_register(ddev, 0);
272	if (ret < 0)
273		goto err_irq_uninstall;
274
275	return 0;
276
277err_irq_uninstall:
278	drm_irq_uninstall(ddev);
279err_modeset_cleanup:
280	drm_kms_helper_poll_fini(ddev);
281err_free_drm_dev:
282	drm_dev_put(ddev);
283
284	return ret;
285}
286
287static struct platform_driver shmob_drm_platform_driver = {
288	.probe		= shmob_drm_probe,
289	.remove		= shmob_drm_remove,
290	.driver		= {
291		.name	= "shmob-drm",
292		.pm	= &shmob_drm_pm_ops,
293	},
294};
295
296module_platform_driver(shmob_drm_platform_driver);
297
298MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
299MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
300MODULE_LICENSE("GPL");
301