text: /*
   * arch/sh/kernel/cpu/sh3/clock-sh3.c
   *
   * Generic SH-3 support for the clock framework
   *
   *  Copyright (C) 2005  Paul Mundt
   *
   * FRQCR parsing hacked out of arch/sh/kernel/time.c
   *
   *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
   *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
   *  Copyright (C) 2002, 2003, 2004  Paul Mundt
   *  Copyright (C) 2002  M. R. Brown  <mrbrown@linux-sh.org>
   *
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file "COPYING" in the main directory of this archive
   * for more details.
   */
  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <asm/clock.h>
  #include <asm/freq.h>
  #include <asm/io.h>
  
  static int stc_multipliers[] = { 1, 2, 3, 4, 6, 1, 1, 1 };
  static int ifc_divisors[]    = { 1, 2, 3, 4, 1, 1, 1, 1 };
  static int pfc_divisors[]    = { 1, 2, 3, 4, 6, 1, 1, 1 };
  
  static void master_clk_init(struct clk *clk)
  {
  	int frqcr = __raw_readw(FRQCR);
  	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
  
  	clk->rate *= pfc_divisors[idx];
  }
  
  static struct clk_ops sh3_master_clk_ops = {
  	.init		= master_clk_init,
  };
  
  static unsigned long module_clk_recalc(struct clk *clk)
  {
  	int frqcr = __raw_readw(FRQCR);
  	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
  
  	return clk->parent->rate / pfc_divisors[idx];
  }
  
  static struct clk_ops sh3_module_clk_ops = {
  	.recalc		= module_clk_recalc,
  };
  
  static unsigned long bus_clk_recalc(struct clk *clk)
  {
  	int frqcr = __raw_readw(FRQCR);
  	int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4);
  
  	return clk->parent->rate / stc_multipliers[idx];
  }
  
  static struct clk_ops sh3_bus_clk_ops = {
  	.recalc		= bus_clk_recalc,
  };
  
  static unsigned long cpu_clk_recalc(struct clk *clk)
  {
  	int frqcr = __raw_readw(FRQCR);
  	int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
  
  	return clk->parent->rate / ifc_divisors[idx];
  }
  
  static struct clk_ops sh3_cpu_clk_ops = {
  	.recalc		= cpu_clk_recalc,
  };
  
  static struct clk_ops *sh3_clk_ops[] = {
  	&sh3_master_clk_ops,
  	&sh3_module_clk_ops,
  	&sh3_bus_clk_ops,
  	&sh3_cpu_clk_ops,
  };
  
  void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
  {
  	if (idx < ARRAY_SIZE(sh3_clk_ops))
  		*ops = sh3_clk_ops[idx];
  }
  
  