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 <plat/omap_hwmod.h>
  25 #include <plat/omap_device.h>
  26
  27 static struct hwspinlock_pdata omap_hwspinlock_pdata __initdata = {
  28         .base_id = 0,
  29 };
  30
  31 int __init hwspinlocks_init(void)
  32 {
  33         int retval = 0;
  34         struct omap_hwmod *oh;
  35         struct platform_device *pdev;
  36         const char *oh_name = "spinlock";
  37         const char *dev_name = "omap_hwspinlock";
  38
  39         /*
  40          * Hwmod lookup will fail in case our platform doesn't support the
  41          * hardware spinlock module, so it is safe to run this initcall
  42          * on all omaps
  43          */
  44         oh = omap_hwmod_lookup(oh_name);
  45         if (oh == NULL)
  46                 return -EINVAL;
  47
  48         pdev = omap_device_build(dev_name, 0, oh, &omap_hwspinlock_pdata,
  49                                 sizeof(struct hwspinlock_pdata),
  50                                 NULL, 0, false);
  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 postcore_initcall(hwspinlocks_init);