/*
   * Copyright (C) 2012 ARM Ltd.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * 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.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  #ifndef __CLKSOURCE_ARM_ARCH_TIMER_H
  #define __CLKSOURCE_ARM_ARCH_TIMER_H

  #include <linux/timecounter.h>

  #include <linux/types.h>
  
  #define ARCH_TIMER_CTRL_ENABLE		(1 << 0)
  #define ARCH_TIMER_CTRL_IT_MASK		(1 << 1)
  #define ARCH_TIMER_CTRL_IT_STAT		(1 << 2)

  #define CNTHCTL_EL1PCTEN		(1 << 0)
  #define CNTHCTL_EL1PCEN			(1 << 1)
  #define CNTHCTL_EVNTEN			(1 << 2)
  #define CNTHCTL_EVNTDIR			(1 << 3)
  #define CNTHCTL_EVNTI			(0xF << 4)

  enum arch_timer_reg {
  	ARCH_TIMER_REG_CTRL,
  	ARCH_TIMER_REG_TVAL,
  };

  
  #define ARCH_TIMER_PHYS_ACCESS		0
  #define ARCH_TIMER_VIRT_ACCESS		1

  #define ARCH_TIMER_MEM_PHYS_ACCESS	2
  #define ARCH_TIMER_MEM_VIRT_ACCESS	3

  #define ARCH_TIMER_USR_PCT_ACCESS_EN	(1 << 0) /* physical counter */
  #define ARCH_TIMER_USR_VCT_ACCESS_EN	(1 << 1) /* virtual counter */
  #define ARCH_TIMER_VIRT_EVT_EN		(1 << 2)
  #define ARCH_TIMER_EVT_TRIGGER_SHIFT	(4)
  #define ARCH_TIMER_EVT_TRIGGER_MASK	(0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
  #define ARCH_TIMER_USR_VT_ACCESS_EN	(1 << 8) /* virtual timer registers */
  #define ARCH_TIMER_USR_PT_ACCESS_EN	(1 << 9) /* physical timer registers */

  #define ARCH_TIMER_EVT_STREAM_FREQ	10000	/* 100us */

  struct arch_timer_kvm_info {
  	struct timecounter timecounter;

  	int virtual_irq;

  };

  #ifdef CONFIG_ARM_ARCH_TIMER

  extern u32 arch_timer_get_rate(void);

  extern u64 (*arch_timer_read_counter)(void);

  extern struct arch_timer_kvm_info *arch_timer_get_kvm_info(void);

  
  #else

  static inline u32 arch_timer_get_rate(void)
  {
  	return 0;
  }
  
  static inline u64 arch_timer_read_counter(void)
  {
  	return 0;
  }

  #endif
  
  #endif