summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/pl111/pl111_drv.c
blob: 581c452cede1df08822a8e0f5932062c3c52c6cc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
/*
 * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
 *
 * Parts of this file were based on sources as follows:
 *
 * Copyright (c) 2006-2008 Intel Corporation
 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
 * Copyright (C) 2011 Texas Instruments
 *
 * This program is free software and is provided to you under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation, and any use by you of this program is subject to the terms of
 * such GNU licence.
 *
 */

/**
 * DOC: ARM PrimeCell PL111 CLCD Driver
 *
 * The PL111 is a simple LCD controller that can support TFT and STN
 * displays.  This driver exposes a standard KMS interface for them.
 *
 * This driver uses the same Device Tree binding as the fbdev CLCD
 * driver.  While the fbdev driver supports panels that may be
 * connected to the CLCD internally to the CLCD driver, in DRM the
 * panels get split out to drivers/gpu/drm/panels/.  This means that,
 * in converting from using fbdev to using DRM, you also need to write
 * a panel driver (which may be as simple as an entry in
 * panel-simple.c).
 *
 * The driver currently doesn't expose the cursor.  The DRM API for
 * cursors requires support for 64x64 ARGB8888 cursor images, while
 * the hardware can only support 64x64 monochrome with masking
 * cursors.  While one could imagine trying to hack something together
 * to look at the ARGB8888 and program reasonable in monochrome, we
 * just don't expose the cursor at all instead, and leave cursor
 * support to the X11 software cursor layer.
 *
 * TODO:
 *
 * - Fix race between setting plane base address and getting IRQ for
 *   vsync firing the pageflip completion.
 *
 * - Expose the correct set of formats we can support based on the
 *   "arm,pl11x,tft-r0g0b0-pads" DT property.
 *
 * - Use the "max-memory-bandwidth" DT property to filter the
 *   supported formats.
 *
 * - Read back hardware state at boot to skip reprogramming the
 *   hardware when doing a no-op modeset.
 *
 * - Use the CLKSEL bit to support switching between the two external
 *   clock parents.
 */

#include <linux/amba/bus.h>
#include <linux/amba/clcd-regs.h>
#include <linux/version.h>
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_fb_cma_helper.h>

#include "pl111_drm.h"

#define DRIVER_DESC      "DRM module for PL111"

static const struct drm_mode_config_funcs mode_config_funcs = {
	.fb_create = drm_gem_fb_create,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
};

static int pl111_modeset_init(struct drm_device *dev)
{
	struct drm_mode_config *mode_config;
	struct pl111_drm_dev_private *priv = dev->dev_private;
	int ret = 0;

	drm_mode_config_init(dev);
	mode_config = &dev->mode_config;
	mode_config->funcs = &mode_config_funcs;
	mode_config->min_width = 1;
	mode_config->max_width = 1024;
	mode_config->min_height = 1;
	mode_config->max_height = 768;

	ret = pl111_connector_init(dev);
	if (ret) {
		dev_err(dev->dev, "Failed to create pl111_drm_connector\n");
		goto out_config;
	}

	/* Don't actually attach if we didn't find a drm_panel
	 * attached to us.  This will allow a kernel to include both
	 * the fbdev pl111 driver and this one, and choose between
	 * them based on which subsystem has support for the panel.
	 */
	if (!priv->connector.panel) {
		dev_info(dev->dev,
			 "Disabling due to lack of DRM panel device.\n");
		ret = -ENODEV;
		goto out_config;
	}

	ret = pl111_display_init(dev);
	if (ret != 0) {
		dev_err(dev->dev, "Failed to init display\n");
		goto out_config;
	}

	ret = drm_vblank_init(dev, 1);
	if (ret != 0) {
		dev_err(dev->dev, "Failed to init vblank\n");
		goto out_config;
	}

	drm_mode_config_reset(dev);

	priv->fbdev = drm_fbdev_cma_init(dev, 32,
					 dev->mode_config.num_connector);

	drm_kms_helper_poll_init(dev);

	goto finish;

out_config:
	drm_mode_config_cleanup(dev);
finish:
	return ret;
}

DEFINE_DRM_GEM_CMA_FOPS(drm_fops);

static void pl111_lastclose(struct drm_device *dev)
{
	struct pl111_drm_dev_private *priv = dev->dev_private;

	drm_fbdev_cma_restore_mode(priv->fbdev);
}

static struct drm_driver pl111_drm_driver = {
	.driver_features =
		DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
	.lastclose = pl111_lastclose,
	.ioctls = NULL,
	.fops = &drm_fops,
	.name = "pl111",
	.desc = DRIVER_DESC,
	.date = "20170317",
	.major = 1,
	.minor = 0,
	.patchlevel = 0,
	.dumb_create = drm_gem_cma_dumb_create,
	.gem_free_object_unlocked = drm_gem_cma_free_object,
	.gem_vm_ops = &drm_gem_cma_vm_ops,

	.enable_vblank = pl111_enable_vblank,
	.disable_vblank = pl111_disable_vblank,

	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
	.gem_prime_import = drm_gem_prime_import,
	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
	.gem_prime_export = drm_gem_prime_export,
	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,

#if defined(CONFIG_DEBUG_FS)
	.debugfs_init = pl111_debugfs_init,
#endif
};

static int pl111_amba_probe(struct amba_device *amba_dev,
			    const struct amba_id *id)
{
	struct device *dev = &amba_dev->dev;
	struct pl111_drm_dev_private *priv;
	struct drm_device *drm;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	drm = drm_dev_alloc(&pl111_drm_driver, dev);
	if (IS_ERR(drm))
		return PTR_ERR(drm);
	amba_set_drvdata(amba_dev, drm);
	priv->drm = drm;
	drm->dev_private = priv;

	priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
	if (IS_ERR(priv->regs)) {
		dev_err(dev, "%s failed mmio\n", __func__);
		return PTR_ERR(priv->regs);
	}

	/* turn off interrupts before requesting the irq */
	writel(0, priv->regs + CLCD_PL111_IENB);

	ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
			       "pl111", priv);
	if (ret != 0) {
		dev_err(dev, "%s failed irq %d\n", __func__, ret);
		return ret;
	}

	ret = pl111_modeset_init(drm);
	if (ret != 0)
		goto dev_unref;

	ret = drm_dev_register(drm, 0);
	if (ret < 0)
		goto dev_unref;

	return 0;

dev_unref:
	drm_dev_unref(drm);
	return ret;
}

static int pl111_amba_remove(struct amba_device *amba_dev)
{
	struct drm_device *drm = amba_get_drvdata(amba_dev);
	struct pl111_drm_dev_private *priv = drm->dev_private;

	drm_dev_unregister(drm);
	if (priv->fbdev)
		drm_fbdev_cma_fini(priv->fbdev);
	drm_mode_config_cleanup(drm);
	drm_dev_unref(drm);

	return 0;
}

static struct amba_id pl111_id_table[] = {
	{
		.id = 0x00041111,
		.mask = 0x000fffff,
	},
	{0, 0},
};

static struct amba_driver pl111_amba_driver __maybe_unused = {
	.drv = {
		.name = "drm-clcd-pl111",
	},
	.probe = pl111_amba_probe,
	.remove = pl111_amba_remove,
	.id_table = pl111_id_table,
};

#ifdef CONFIG_ARM_AMBA
module_amba_driver(pl111_amba_driver);
#endif

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("ARM Ltd.");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud