tegra_ion.c revision f71373c06c48660fb9a52e3393f86dac3e9ffd84 
1/*
2 * drivers/gpu/tegra/tegra_ion.c
3 *
4 * Copyright (C) 2011 Google, Inc.
5 *
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 */
16
17#include <linux/err.h>
18#include <linux/platform_device.h>
19#include <linux/slab.h>
20#include "../ion.h"
21#include "../ion_priv.h"
22
23static struct ion_device *idev;
24static int num_heaps;
25static struct ion_heap **heaps;
26
27static int tegra_ion_probe(struct platform_device *pdev)
28{
29	struct ion_platform_data *pdata = pdev->dev.platform_data;
30	int err;
31	int i;
32
33	num_heaps = pdata->nr;
34
35	heaps = devm_kzalloc(&pdev->dev,
36			     sizeof(struct ion_heap *) * pdata->nr,
37			     GFP_KERNEL);
38
39	idev = ion_device_create(NULL);
40	if (IS_ERR_OR_NULL(idev))
41		return PTR_ERR(idev);
42
43	/* create the heaps as specified in the board file */
44	for (i = 0; i < num_heaps; i++) {
45		struct ion_platform_heap *heap_data = &pdata->heaps[i];
46
47		heaps[i] = ion_heap_create(heap_data);
48		if (IS_ERR_OR_NULL(heaps[i])) {
49			err = PTR_ERR(heaps[i]);
50			goto err;
51		}
52		ion_device_add_heap(idev, heaps[i]);
53	}
54	platform_set_drvdata(pdev, idev);
55	return 0;
56err:
57	for (i = 0; i < num_heaps; i++) {
58		if (heaps[i])
59			ion_heap_destroy(heaps[i]);
60	}
61	return err;
62}
63
64static int tegra_ion_remove(struct platform_device *pdev)
65{
66	struct ion_device *idev = platform_get_drvdata(pdev);
67	int i;
68
69	ion_device_destroy(idev);
70	for (i = 0; i < num_heaps; i++)
71		ion_heap_destroy(heaps[i]);
72	return 0;
73}
74
75static struct platform_driver ion_driver = {
76	.probe = tegra_ion_probe,
77	.remove = tegra_ion_remove,
78	.driver = { .name = "ion-tegra" }
79};
80
81module_platform_driver(ion_driver);
82
83