release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sh/kernel/cpu/sh4a/clock-sh7770.c

   1 /*
   2  * arch/sh/kernel/cpu/sh4a/clock-sh7770.c
   3  *
   4  * SH7770 support for the clock framework
   5  *
   6  *  Copyright (C) 2005  Paul Mundt
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file "COPYING" in the main directory of this archive
  10  * for more details.
  11  */
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <asm/clock.h>
  15 #include <asm/freq.h>
  16 #include <asm/io.h>
  17
  18 static int ifc_divisors[] = { 1, 1, 1, 1, 1, 1, 1, 1 };
  19 static int bfc_divisors[] = { 1, 1, 1, 1, 1, 8,12, 1 };
  20 static int pfc_divisors[] = { 1, 8, 1,10,12,16, 1, 1 };
  21
  22 static void master_clk_init(struct clk *clk)
  23 {
  24         clk->rate *= pfc_divisors[(__raw_readl(FRQCR) >> 28) & 0x000f];
  25 }
  26
  27 static struct clk_ops sh7770_master_clk_ops = {
  28         .init           = master_clk_init,
  29 };
  30
  31 static unsigned long module_clk_recalc(struct clk *clk)
  32 {
  33         int idx = ((__raw_readl(FRQCR) >> 28) & 0x000f);
  34         return clk->parent->rate / pfc_divisors[idx];
  35 }
  36
  37 static struct clk_ops sh7770_module_clk_ops = {
  38         .recalc         = module_clk_recalc,
  39 };
  40
  41 static unsigned long bus_clk_recalc(struct clk *clk)
  42 {
  43         int idx = (__raw_readl(FRQCR) & 0x000f);
  44         return clk->parent->rate / bfc_divisors[idx];
  45 }
  46
  47 static struct clk_ops sh7770_bus_clk_ops = {
  48         .recalc         = bus_clk_recalc,
  49 };
  50
  51 static unsigned long cpu_clk_recalc(struct clk *clk)
  52 {
  53         int idx = ((__raw_readl(FRQCR) >> 24) & 0x000f);
  54         return clk->parent->rate / ifc_divisors[idx];
  55 }
  56
  57 static struct clk_ops sh7770_cpu_clk_ops = {
  58         .recalc         = cpu_clk_recalc,
  59 };
  60
  61 static struct clk_ops *sh7770_clk_ops[] = {
  62         &sh7770_master_clk_ops,
  63         &sh7770_module_clk_ops,
  64         &sh7770_bus_clk_ops,
  65         &sh7770_cpu_clk_ops,
  66 };
  67
  68 void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
  69 {
  70         if (idx < ARRAY_SIZE(sh7770_clk_ops))
  71                 *ops = sh7770_clk_ops[idx];
  72 }