xref: /openbmc/linux/arch/arm/mach-omap2/omap-iommu.c (revision f7018c21)
1 /*
2  * omap iommu: omap device registration
3  *
4  * Copyright (C) 2008-2009 Nokia Corporation
5  *
6  * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12 
13 #include <linux/of.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/err.h>
17 #include <linux/slab.h>
18 
19 #include <linux/platform_data/iommu-omap.h>
20 #include "soc.h"
21 #include "omap_hwmod.h"
22 #include "omap_device.h"
23 
24 static int __init omap_iommu_dev_init(struct omap_hwmod *oh, void *unused)
25 {
26 	struct platform_device *pdev;
27 	struct iommu_platform_data *pdata;
28 	struct omap_mmu_dev_attr *a = (struct omap_mmu_dev_attr *)oh->dev_attr;
29 	static int i;
30 
31 	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
32 	if (!pdata)
33 		return -ENOMEM;
34 
35 	pdata->name = oh->name;
36 	pdata->nr_tlb_entries = a->nr_tlb_entries;
37 	pdata->da_start = a->da_start;
38 	pdata->da_end = a->da_end;
39 
40 	if (oh->rst_lines_cnt == 1) {
41 		pdata->reset_name = oh->rst_lines->name;
42 		pdata->assert_reset = omap_device_assert_hardreset;
43 		pdata->deassert_reset = omap_device_deassert_hardreset;
44 	}
45 
46 	pdev = omap_device_build("omap-iommu", i, oh, pdata, sizeof(*pdata));
47 
48 	kfree(pdata);
49 
50 	if (IS_ERR(pdev)) {
51 		pr_err("%s: device build err: %ld\n", __func__, PTR_ERR(pdev));
52 		return PTR_ERR(pdev);
53 	}
54 
55 	i++;
56 
57 	return 0;
58 }
59 
60 static int __init omap_iommu_init(void)
61 {
62 	/* If dtb is there, the devices will be created dynamically */
63 	if (of_have_populated_dt())
64 		return -ENODEV;
65 
66 	return omap_hwmod_for_each_by_class("mmu", omap_iommu_dev_init, NULL);
67 }
68 /* must be ready before omap3isp is probed */
69 omap_subsys_initcall(omap_iommu_init);
70 
71 static void __exit omap_iommu_exit(void)
72 {
73 	/* Do nothing */
74 }
75 module_exit(omap_iommu_exit);
76 
77 MODULE_AUTHOR("Hiroshi DOYU");
78 MODULE_DESCRIPTION("omap iommu: omap device registration");
79 MODULE_LICENSE("GPL v2");
80