arch/arm/mach-omap2/omap-iommu.c

   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
  38         if (oh->rst_lines_cnt == 1) {
  39                 pdata->reset_name = oh->rst_lines->name;
  40                 pdata->assert_reset = omap_device_assert_hardreset;
  41                 pdata->deassert_reset = omap_device_deassert_hardreset;
  42         }
  43
  44         pdev = omap_device_build("omap-iommu", i, oh, pdata, sizeof(*pdata));
  45
  46         kfree(pdata);
  47
  48         if (IS_ERR(pdev)) {
  49                 pr_err("%s: device build err: %ld\n", __func__, PTR_ERR(pdev));
  50                 return PTR_ERR(pdev);
  51         }
  52
  53         i++;
  54
  55         return 0;
  56 }
  57
  58 static int __init omap_iommu_init(void)
  59 {
  60         /* If dtb is there, the devices will be created dynamically */
  61         if (of_have_populated_dt())
  62                 return -ENODEV;
  63
  64         return omap_hwmod_for_each_by_class("mmu", omap_iommu_dev_init, NULL);
  65 }
  66 /* must be ready before omap3isp is probed */
  67 omap_subsys_initcall(omap_iommu_init);
  68
  69 static void __exit omap_iommu_exit(void)
  70 {
  71         /* Do nothing */
  72 }
  73 module_exit(omap_iommu_exit);
  74
  75 MODULE_AUTHOR("Hiroshi DOYU");
  76 MODULE_DESCRIPTION("omap iommu: omap device registration");
  77 MODULE_LICENSE("GPL v2");