text: /*
   * arch/sh/kernel/cpu/sh3/clock-sh7709.c
   *
   * SH7709 support for the clock framework
   *
   *  Copyright (C) 2005  Andriy Skulysh
   *
   * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.c
   *  Copyright (C) 2005  Paul Mundt
   *
   * 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, 4, 8, 3, 6, 1, 1 };
  static int ifc_divisors[]    = { 1, 2, 4, 1, 3, 1, 1, 1 };
  static int pfc_divisors[]    = { 1, 2, 4, 1, 3, 6, 1, 1 };
  
  static void set_bus_parent(struct clk *clk)
  {
  	struct clk *bus_clk = clk_get(NULL, "bus_clk");
  	clk->parent = bus_clk;
  	clk_put(bus_clk);
  }
  
  static void master_clk_init(struct clk *clk)
  {
  	int frqcr = ctrl_inw(FRQCR);
  	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
  
  	clk->rate *= pfc_divisors[idx];
  }
  
  static struct clk_ops sh7709_master_clk_ops = {
  	.init		= master_clk_init,
  };
  
  static void module_clk_recalc(struct clk *clk)
  {
  	int frqcr = ctrl_inw(FRQCR);
  	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
  
  	clk->rate = clk->parent->rate / pfc_divisors[idx];
  }
  
  static struct clk_ops sh7709_module_clk_ops = {
  #ifdef CLOCK_MODE_0_1_2_7
  	.init		= set_bus_parent,
  #endif
  	.recalc		= module_clk_recalc,
  };
  
  static void bus_clk_recalc(struct clk *clk)
  {
  	int frqcr = ctrl_inw(FRQCR);
  	int idx = (frqcr & 0x0080) ?
  		((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1;
  
  	clk->rate = clk->parent->rate * stc_multipliers[idx];
  }
  
  static struct clk_ops sh7709_bus_clk_ops = {
  	.recalc		= bus_clk_recalc,
  };
  
  static void cpu_clk_recalc(struct clk *clk)
  {
  	int frqcr = ctrl_inw(FRQCR);
  	int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
  
  	clk->rate = clk->parent->rate / ifc_divisors[idx];
  }
  
  static struct clk_ops sh7709_cpu_clk_ops = {
  	.init		= set_bus_parent,
  	.recalc		= cpu_clk_recalc,
  };
  
  static struct clk_ops *sh7709_clk_ops[] = {
  	&sh7709_master_clk_ops,
  	&sh7709_module_clk_ops,
  	&sh7709_bus_clk_ops,
  	&sh7709_cpu_clk_ops,
  };
  
  void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
  {
  	if (idx < ARRAY_SIZE(sh7709_clk_ops))
  		*ops = sh7709_clk_ops[idx];
  }
  