summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/cirrus/cirrus_main.c
blob: 99c1983f99d228b77ce9c498236ad68b348440e2 (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
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
/*
 * Copyright 2012 Red Hat
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License version 2. See the file COPYING in the main
 * directory of this archive for more details.
 *
 * Authors: Matthew Garrett
 *          Dave Airlie
 */
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>

#include "cirrus_drv.h"


static void cirrus_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
	struct cirrus_framebuffer *cirrus_fb = to_cirrus_framebuffer(fb);
	if (cirrus_fb->obj)
		drm_gem_object_unreference_unlocked(cirrus_fb->obj);
	drm_framebuffer_cleanup(fb);
	kfree(fb);
}

static const struct drm_framebuffer_funcs cirrus_fb_funcs = {
	.destroy = cirrus_user_framebuffer_destroy,
};

int cirrus_framebuffer_init(struct drm_device *dev,
			    struct cirrus_framebuffer *gfb,
			    struct drm_mode_fb_cmd2 *mode_cmd,
			    struct drm_gem_object *obj)
{
	int ret;

	drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
	gfb->obj = obj;
	ret = drm_framebuffer_init(dev, &gfb->base, &cirrus_fb_funcs);
	if (ret) {
		DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
		return ret;
	}
	return 0;
}

static struct drm_framebuffer *
cirrus_user_framebuffer_create(struct drm_device *dev,
			       struct drm_file *filp,
			       struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_gem_object *obj;
	struct cirrus_framebuffer *cirrus_fb;
	int ret;
	u32 bpp, depth;

	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
	/* cirrus can't handle > 24bpp framebuffers at all */
	if (bpp > 24)
		return ERR_PTR(-EINVAL);

	obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
	if (obj == NULL)
		return ERR_PTR(-ENOENT);

	cirrus_fb = kzalloc(sizeof(*cirrus_fb), GFP_KERNEL);
	if (!cirrus_fb) {
		drm_gem_object_unreference_unlocked(obj);
		return ERR_PTR(-ENOMEM);
	}

	ret = cirrus_framebuffer_init(dev, cirrus_fb, mode_cmd, obj);
	if (ret) {
		drm_gem_object_unreference_unlocked(obj);
		kfree(cirrus_fb);
		return ERR_PTR(ret);
	}
	return &cirrus_fb->base;
}

static const struct drm_mode_config_funcs cirrus_mode_funcs = {
	.fb_create = cirrus_user_framebuffer_create,
};

/* Unmap the framebuffer from the core and release the memory */
static void cirrus_vram_fini(struct cirrus_device *cdev)
{
	iounmap(cdev->rmmio);
	cdev->rmmio = NULL;
	if (cdev->mc.vram_base)
		release_mem_region(cdev->mc.vram_base, cdev->mc.vram_size);
}

/* Map the framebuffer from the card and configure the core */
static int cirrus_vram_init(struct cirrus_device *cdev)
{
	/* BAR 0 is VRAM */
	cdev->mc.vram_base = pci_resource_start(cdev->dev->pdev, 0);
	/* We have 4MB of VRAM */
	cdev->mc.vram_size = 4 * 1024 * 1024;

	if (!request_mem_region(cdev->mc.vram_base, cdev->mc.vram_size,
				"cirrusdrmfb_vram")) {
		DRM_ERROR("can't reserve VRAM\n");
		return -ENXIO;
	}

	return 0;
}

/*
 * Our emulated hardware has two sets of memory. One is video RAM and can
 * simply be used as a linear framebuffer - the other provides mmio access
 * to the display registers. The latter can also be accessed via IO port
 * access, but we map the range and use mmio to program them instead
 */

int cirrus_device_init(struct cirrus_device *cdev,
		       struct drm_device *ddev,
		       struct pci_dev *pdev, uint32_t flags)
{
	int ret;

	cdev->dev = ddev;
	cdev->flags = flags;

	/* Hardcode the number of CRTCs to 1 */
	cdev->num_crtc = 1;

	/* BAR 0 is the framebuffer, BAR 1 contains registers */
	cdev->rmmio_base = pci_resource_start(cdev->dev->pdev, 1);
	cdev->rmmio_size = pci_resource_len(cdev->dev->pdev, 1);

	if (!request_mem_region(cdev->rmmio_base, cdev->rmmio_size,
				"cirrusdrmfb_mmio")) {
		DRM_ERROR("can't reserve mmio registers\n");
		return -ENOMEM;
	}

	cdev->rmmio = ioremap(cdev->rmmio_base, cdev->rmmio_size);

	if (cdev->rmmio == NULL)
		return -ENOMEM;

	ret = cirrus_vram_init(cdev);
	if (ret) {
		release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
		return ret;
	}

	return 0;
}

void cirrus_device_fini(struct cirrus_device *cdev)
{
	release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
	cirrus_vram_fini(cdev);
}

/*
 * Functions here will be called by the core once it's bound the driver to
 * a PCI device
 */

int cirrus_driver_load(struct drm_device *dev, unsigned long flags)
{
	struct cirrus_device *cdev;
	int r;

	cdev = kzalloc(sizeof(struct cirrus_device), GFP_KERNEL);
	if (cdev == NULL)
		return -ENOMEM;
	dev->dev_private = (void *)cdev;

	r = cirrus_device_init(cdev, dev, dev->pdev, flags);
	if (r) {
		dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
		goto out;
	}

	r = cirrus_mm_init(cdev);
	if (r)
		dev_err(&dev->pdev->dev, "fatal err on mm init\n");

	r = cirrus_modeset_init(cdev);
	if (r)
		dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);

	dev->mode_config.funcs = (void *)&cirrus_mode_funcs;
out:
	if (r)
		cirrus_driver_unload(dev);
	return r;
}

int cirrus_driver_unload(struct drm_device *dev)
{
	struct cirrus_device *cdev = dev->dev_private;

	if (cdev == NULL)
		return 0;
	cirrus_modeset_fini(cdev);
	cirrus_mm_fini(cdev);
	cirrus_device_fini(cdev);
	kfree(cdev);
	dev->dev_private = NULL;
	return 0;
}

int cirrus_gem_create(struct drm_device *dev,
		   u32 size, bool iskernel,
		   struct drm_gem_object **obj)
{
	struct cirrus_bo *cirrusbo;
	int ret;

	*obj = NULL;

	size = roundup(size, PAGE_SIZE);
	if (size == 0)
		return -EINVAL;

	ret = cirrus_bo_create(dev, size, 0, 0, &cirrusbo);
	if (ret) {
		if (ret != -ERESTARTSYS)
			DRM_ERROR("failed to allocate GEM object\n");
		return ret;
	}
	*obj = &cirrusbo->gem;
	return 0;
}

int cirrus_dumb_create(struct drm_file *file,
		    struct drm_device *dev,
		    struct drm_mode_create_dumb *args)
{
	int ret;
	struct drm_gem_object *gobj;
	u32 handle;

	args->pitch = args->width * ((args->bpp + 7) / 8);
	args->size = args->pitch * args->height;

	ret = cirrus_gem_create(dev, args->size, false,
			     &gobj);
	if (ret)
		return ret;

	ret = drm_gem_handle_create(file, gobj, &handle);
	drm_gem_object_unreference_unlocked(gobj);
	if (ret)
		return ret;

	args->handle = handle;
	return 0;
}

static void cirrus_bo_unref(struct cirrus_bo **bo)
{
	struct ttm_buffer_object *tbo;

	if ((*bo) == NULL)
		return;

	tbo = &((*bo)->bo);
	ttm_bo_unref(&tbo);
	*bo = NULL;
}

void cirrus_gem_free_object(struct drm_gem_object *obj)
{
	struct cirrus_bo *cirrus_bo = gem_to_cirrus_bo(obj);

	cirrus_bo_unref(&cirrus_bo);
}


static inline u64 cirrus_bo_mmap_offset(struct cirrus_bo *bo)
{
	return drm_vma_node_offset_addr(&bo->bo.vma_node);
}

int
cirrus_dumb_mmap_offset(struct drm_file *file,
		     struct drm_device *dev,
		     uint32_t handle,
		     uint64_t *offset)
{
	struct drm_gem_object *obj;
	int ret;
	struct cirrus_bo *bo;

	mutex_lock(&dev->struct_mutex);
	obj = drm_gem_object_lookup(dev, file, handle);
	if (obj == NULL) {
		ret = -ENOENT;
		goto out_unlock;
	}

	bo = gem_to_cirrus_bo(obj);
	*offset = cirrus_bo_mmap_offset(bo);

	drm_gem_object_unreference(obj);
	ret = 0;
out_unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;

}