arch/arm/mach-omap2/hwspinlock.c

   1 /*
   2  * OMAP hardware spinlock device initialization
   3  *
   4  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Contact: Simon Que <sque@ti.com>
   7  *          Hari Kanigeri <h-kanigeri2@ti.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/err.h>
  22 #include <linux/hwspinlock.h>
  23
  24 #include "soc.h"
  25 #include "omap_hwmod.h"
  26 #include "omap_device.h"
  27
  28 static struct hwspinlock_pdata omap_hwspinlock_pdata __initdata = {
  29         .base_id = 0,
  30 };
  31
  32 static int __init hwspinlocks_init(void)
  33 {
  34         int retval = 0;
  35         struct omap_hwmod *oh;
  36         struct platform_device *pdev;
  37         const char *oh_name = "spinlock";
  38         const char *dev_name = "omap_hwspinlock";
  39
  40         /*
  41          * Hwmod lookup will fail in case our platform doesn't support the
  42          * hardware spinlock module, so it is safe to run this initcall
  43          * on all omaps
  44          */
  45         oh = omap_hwmod_lookup(oh_name);
  46         if (oh == NULL)
  47                 return -EINVAL;
  48
  49         pdev = omap_device_build(dev_name, 0, oh, &omap_hwspinlock_pdata,
  50                                 sizeof(struct hwspinlock_pdata));
  51         if (IS_ERR(pdev)) {
  52                 pr_err("Can't build omap_device for %s:%s\n", dev_name,
  53                                                                 oh_name);
  54                 retval = PTR_ERR(pdev);
  55         }
  56
  57         return retval;
  58 }
  59 /* early board code might need to reserve specific hwspinlock instances */
  60 omap_postcore_initcall(hwspinlocks_init);