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
  23 #include <plat/omap_hwmod.h>
  24 #include <plat/omap_device.h>
  25
  26 struct omap_device_pm_latency omap_spinlock_latency[] = {
  27         {
  28                 .deactivate_func = omap_device_idle_hwmods,
  29                 .activate_func   = omap_device_enable_hwmods,
  30                 .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
  31         }
  32 };
  33
  34 int __init hwspinlocks_init(void)
  35 {
  36         int retval = 0;
  37         struct omap_hwmod *oh;
  38         struct omap_device *od;
  39         const char *oh_name = "spinlock";
  40         const char *dev_name = "omap_hwspinlock";
  41
  42         /*
  43          * Hwmod lookup will fail in case our platform doesn't support the
  44          * hardware spinlock module, so it is safe to run this initcall
  45          * on all omaps
  46          */
  47         oh = omap_hwmod_lookup(oh_name);
  48         if (oh == NULL)
  49                 return -EINVAL;
  50
  51         od = omap_device_build(dev_name, 0, oh, NULL, 0,
  52                                 omap_spinlock_latency,
  53                                 ARRAY_SIZE(omap_spinlock_latency), false);
  54         if (IS_ERR(od)) {
  55                 pr_err("Can't build omap_device for %s:%s\n", dev_name,
  56                                                                 oh_name);
  57                 retval = PTR_ERR(od);
  58         }
  59
  60         return retval;
  61 }
  62 /* early board code might need to reserve specific hwspinlock instances */
  63 postcore_initcall(hwspinlocks_init);