/*
   * High-Speed Bus Matrix helper functions
   *
   * Copyright (C) 2008 Atmel Corporation
   *
   * 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.
   */
  #include <linux/clk.h>
  #include <linux/io.h>
  
  #include <mach/chip.h>
  #include <mach/hmatrix.h>
  
  static inline void __hmatrix_write_reg(unsigned long offset, u32 value)
  {
  	__raw_writel(value, (void __iomem __force *)(HMATRIX_BASE + offset));
  }
  
  static inline u32 __hmatrix_read_reg(unsigned long offset)
  {
  	return __raw_readl((void __iomem __force *)(HMATRIX_BASE + offset));
  }
  
  /**
   * hmatrix_write_reg - write HMATRIX configuration register
   * @offset: register offset
   * @value: value to be written to the register at @offset
   */
  void hmatrix_write_reg(unsigned long offset, u32 value)
  {
  	clk_enable(&at32_hmatrix_clk);
  	__hmatrix_write_reg(offset, value);
  	__hmatrix_read_reg(offset);
  	clk_disable(&at32_hmatrix_clk);
  }
  
  /**
   * hmatrix_read_reg - read HMATRIX configuration register
   * @offset: register offset
   *
   * Returns the value of the register at @offset.
   */
  u32 hmatrix_read_reg(unsigned long offset)
  {
  	u32 value;
  
  	clk_enable(&at32_hmatrix_clk);
  	value = __hmatrix_read_reg(offset);
  	clk_disable(&at32_hmatrix_clk);
  
  	return value;
  }
  
  /**
   * hmatrix_sfr_set_bits - set bits in a slave's Special Function Register
   * @slave_id: operate on the SFR belonging to this slave
   * @mask: mask of bits to be set in the SFR
   */
  void hmatrix_sfr_set_bits(unsigned int slave_id, u32 mask)
  {
  	u32 value;
  
  	clk_enable(&at32_hmatrix_clk);
  	value = __hmatrix_read_reg(HMATRIX_SFR(slave_id));
  	value |= mask;
  	__hmatrix_write_reg(HMATRIX_SFR(slave_id), value);
  	__hmatrix_read_reg(HMATRIX_SFR(slave_id));
  	clk_disable(&at32_hmatrix_clk);
  }
  
  /**
   * hmatrix_sfr_set_bits - clear bits in a slave's Special Function Register
   * @slave_id: operate on the SFR belonging to this slave
   * @mask: mask of bits to be cleared in the SFR
   */
  void hmatrix_sfr_clear_bits(unsigned int slave_id, u32 mask)
  {
  	u32 value;
  
  	clk_enable(&at32_hmatrix_clk);
  	value = __hmatrix_read_reg(HMATRIX_SFR(slave_id));
  	value &= ~mask;
  	__hmatrix_write_reg(HMATRIX_SFR(slave_id), value);
  	__hmatrix_read_reg(HMATRIX_SFR(slave_id));
  	clk_disable(&at32_hmatrix_clk);
  }