summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/armada/armada_fbdev.c
blob: 3943e89cc06c826b768009222aef337cbbc7e2af (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 Russell King
 *  Written from the i915 driver.
 */

#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/kernel.h>
#include <linux/module.h>

#include <drm/drm_crtc_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>

#include "armada_crtc.h"
#include "armada_drm.h"
#include "armada_fb.h"
#include "armada_gem.h"

static void armada_fbdev_fb_destroy(struct fb_info *info)
{
	struct drm_fb_helper *fbh = info->par;

	drm_fb_helper_fini(fbh);

	fbh->fb->funcs->destroy(fbh->fb);

	drm_client_release(&fbh->client);
	drm_fb_helper_unprepare(fbh);
	kfree(fbh);
}

static const struct fb_ops armada_fb_ops = {
	.owner		= THIS_MODULE,
	FB_DEFAULT_IO_OPS,
	DRM_FB_HELPER_DEFAULT_OPS,
	.fb_destroy	= armada_fbdev_fb_destroy,
};

static int armada_fbdev_create(struct drm_fb_helper *fbh,
	struct drm_fb_helper_surface_size *sizes)
{
	struct drm_device *dev = fbh->dev;
	struct drm_mode_fb_cmd2 mode;
	struct armada_framebuffer *dfb;
	struct armada_gem_object *obj;
	struct fb_info *info;
	int size, ret;
	void *ptr;

	memset(&mode, 0, sizeof(mode));
	mode.width = sizes->surface_width;
	mode.height = sizes->surface_height;
	mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
	mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
					sizes->surface_depth);

	size = mode.pitches[0] * mode.height;
	obj = armada_gem_alloc_private_object(dev, size);
	if (!obj) {
		DRM_ERROR("failed to allocate fb memory\n");
		return -ENOMEM;
	}

	ret = armada_gem_linear_back(dev, obj);
	if (ret) {
		drm_gem_object_put(&obj->obj);
		return ret;
	}

	ptr = armada_gem_map_object(dev, obj);
	if (!ptr) {
		drm_gem_object_put(&obj->obj);
		return -ENOMEM;
	}

	dfb = armada_framebuffer_create(dev, &mode, obj);

	/*
	 * A reference is now held by the framebuffer object if
	 * successful, otherwise this drops the ref for the error path.
	 */
	drm_gem_object_put(&obj->obj);

	if (IS_ERR(dfb))
		return PTR_ERR(dfb);

	info = drm_fb_helper_alloc_info(fbh);
	if (IS_ERR(info)) {
		ret = PTR_ERR(info);
		goto err_fballoc;
	}

	info->fbops = &armada_fb_ops;
	info->fix.smem_start = obj->phys_addr;
	info->fix.smem_len = obj->obj.size;
	info->screen_size = obj->obj.size;
	info->screen_base = ptr;
	fbh->fb = &dfb->fb;

	drm_fb_helper_fill_info(info, fbh, sizes);

	DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
		dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
		(unsigned long long)obj->phys_addr);

	return 0;

 err_fballoc:
	dfb->fb.funcs->destroy(&dfb->fb);
	return ret;
}

static int armada_fb_probe(struct drm_fb_helper *fbh,
	struct drm_fb_helper_surface_size *sizes)
{
	int ret = 0;

	if (!fbh->fb) {
		ret = armada_fbdev_create(fbh, sizes);
		if (ret == 0)
			ret = 1;
	}
	return ret;
}

static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
	.fb_probe	= armada_fb_probe,
};

/*
 * Fbdev client and struct drm_client_funcs
 */

static void armada_fbdev_client_unregister(struct drm_client_dev *client)
{
	struct drm_fb_helper *fbh = drm_fb_helper_from_client(client);

	if (fbh->info) {
		drm_fb_helper_unregister_info(fbh);
	} else {
		drm_client_release(&fbh->client);
		drm_fb_helper_unprepare(fbh);
		kfree(fbh);
	}
}

static int armada_fbdev_client_restore(struct drm_client_dev *client)
{
	drm_fb_helper_lastclose(client->dev);

	return 0;
}

static int armada_fbdev_client_hotplug(struct drm_client_dev *client)
{
	struct drm_fb_helper *fbh = drm_fb_helper_from_client(client);
	struct drm_device *dev = client->dev;
	int ret;

	if (dev->fb_helper)
		return drm_fb_helper_hotplug_event(dev->fb_helper);

	ret = drm_fb_helper_init(dev, fbh);
	if (ret)
		goto err_drm_err;

	if (!drm_drv_uses_atomic_modeset(dev))
		drm_helper_disable_unused_functions(dev);

	ret = drm_fb_helper_initial_config(fbh);
	if (ret)
		goto err_drm_fb_helper_fini;

	return 0;

err_drm_fb_helper_fini:
	drm_fb_helper_fini(fbh);
err_drm_err:
	drm_err(dev, "armada: Failed to setup fbdev emulation (ret=%d)\n", ret);
	return ret;
}

static const struct drm_client_funcs armada_fbdev_client_funcs = {
	.owner		= THIS_MODULE,
	.unregister	= armada_fbdev_client_unregister,
	.restore	= armada_fbdev_client_restore,
	.hotplug	= armada_fbdev_client_hotplug,
};

void armada_fbdev_setup(struct drm_device *dev)
{
	struct drm_fb_helper *fbh;
	int ret;

	drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
	drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");

	fbh = kzalloc(sizeof(*fbh), GFP_KERNEL);
	if (!fbh)
		return;
	drm_fb_helper_prepare(dev, fbh, 32, &armada_fb_helper_funcs);

	ret = drm_client_init(dev, &fbh->client, "fbdev", &armada_fbdev_client_funcs);
	if (ret) {
		drm_err(dev, "Failed to register client: %d\n", ret);
		goto err_drm_client_init;
	}

	ret = armada_fbdev_client_hotplug(&fbh->client);
	if (ret)
		drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);

	drm_client_register(&fbh->client);

	return;

err_drm_client_init:
	drm_fb_helper_unprepare(fbh);
	kfree(fbh);
	return;
}