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/platform_device.h>
  15 #include <linux/err.h>
  16 #include <linux/slab.h>
  17
  18 #include <linux/platform_data/iommu-omap.h>
  19 #include "soc.h"
  20 #include "omap_hwmod.h"
  21 #include "omap_device.h"
  22
  23 static int __init omap_iommu_dev_init(struct omap_hwmod *oh, void *unused)
  24 {
  25         struct platform_device *pdev;
  26         struct iommu_platform_data *pdata;
  27         struct omap_mmu_dev_attr *a = (struct omap_mmu_dev_attr *)oh->dev_attr;
  28         static int i;
  29
  30         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
  31         if (!pdata)
  32                 return -ENOMEM;
  33
  34         pdata->name = oh->name;
  35         pdata->nr_tlb_entries = a->nr_tlb_entries;
  36
  37         if (oh->rst_lines_cnt == 1) {
  38                 pdata->reset_name = oh->rst_lines->name;
  39                 pdata->assert_reset = omap_device_assert_hardreset;
  40                 pdata->deassert_reset = omap_device_deassert_hardreset;
  41         }
  42
  43         pdev = omap_device_build("omap-iommu", i, oh, pdata, sizeof(*pdata));
  44
  45         kfree(pdata);
  46
  47         if (IS_ERR(pdev)) {
  48                 pr_err("%s: device build err: %ld\n", __func__, PTR_ERR(pdev));
  49                 return PTR_ERR(pdev);
  50         }
  51
  52         i++;
  53
  54         return 0;
  55 }
  56
  57 static int __init omap_iommu_init(void)
  58 {
  59         /* If dtb is there, the devices will be created dynamically */
  60         if (of_have_populated_dt())
  61                 return -ENODEV;
  62
  63         return omap_hwmod_for_each_by_class("mmu", omap_iommu_dev_init, NULL);
  64 }
  65 omap_subsys_initcall(omap_iommu_init);
  66 /* must be ready before omap3isp is probed */