/*
   * Copyright (C) 2013 Google, Inc.
   *
   * This software is licensed under the terms of the GNU General Public
   * License version 2, as published by the Free Software Foundation, and
   * may be copied, distributed, and modified under those terms.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   */
  
  #include <asm/fiq_glue.h>
  #include <linux/platform_device.h>
  #include <linux/trusty/smcall.h>
  #include <linux/trusty/trusty.h>
  
  #include "trusty-fiq.h"
  
  #define _STRINGIFY(x) #x
  #define STRINGIFY(x) _STRINGIFY(x)
  
  static void __naked trusty_fiq_return(void)
  {
  	asm volatile(
  		".arch_extension sec
  "
  		"mov	r12, r0
  "
  		"ldr	r0, =" STRINGIFY(SMC_FC_FIQ_EXIT) "
  "
  		"smc	#0");
  }
  
  int trusty_fiq_arch_probe(struct platform_device *pdev)
  {
  	return fiq_glue_set_return_handler(trusty_fiq_return);
  }
  
  void trusty_fiq_arch_remove(struct platform_device *pdev)
  {
  	fiq_glue_clear_return_handler(trusty_fiq_return);
  }