LXR linux/arch/sh/kernel/cpu/sh3/clock-sh7712.c

   1/*
   2 * arch/sh/kernel/cpu/sh3/clock-sh7712.c
   3 *
   4 * SH7712 support for the clock framework
   5 *
   6 *  Copyright (C) 2007  Andrew Murray <amurray@mpc-data.co.uk>
   7 *
   8 * Based on arch/sh/kernel/cpu/sh3/clock-sh3.c
   9 *  Copyright (C) 2005  Paul Mundt
  10 *
  11 * This file is subject to the terms and conditions of the GNU General Public
  12 * License.  See the file "COPYING" in the main directory of this archive
  13 * for more details.
  14 */
  15#include <linux/init.h>
  16#include <linux/kernel.h>
  17#include <asm/clock.h>
  18#include <asm/freq.h>
  19#include <asm/io.h>
  20
  21static int multipliers[] = { 1, 2, 3 };
  22static int divisors[]    = { 1, 2, 3, 4, 6 };
  23
  24static void master_clk_init(struct clk *clk)
  25{
  26        int frqcr = __raw_readw(FRQCR);
  27        int idx = (frqcr & 0x0300) >> 8;
  28
  29        clk->rate *= multipliers[idx];
  30}
  31
  32static struct sh_clk_ops sh7712_master_clk_ops = {
  33        .init           = master_clk_init,
  34};
  35
  36static unsigned long module_clk_recalc(struct clk *clk)
  37{
  38        int frqcr = __raw_readw(FRQCR);
  39        int idx = frqcr & 0x0007;
  40
  41        return clk->parent->rate / divisors[idx];
  42}
  43
  44static struct sh_clk_ops sh7712_module_clk_ops = {
  45        .recalc         = module_clk_recalc,
  46};
  47
  48static unsigned long cpu_clk_recalc(struct clk *clk)
  49{
  50        int frqcr = __raw_readw(FRQCR);
  51        int idx = (frqcr & 0x0030) >> 4;
  52
  53        return clk->parent->rate / divisors[idx];
  54}
  55
  56static struct sh_clk_ops sh7712_cpu_clk_ops = {
  57        .recalc         = cpu_clk_recalc,
  58};
  59
  60static struct sh_clk_ops *sh7712_clk_ops[] = {
  61        &sh7712_master_clk_ops,
  62        &sh7712_module_clk_ops,
  63        &sh7712_cpu_clk_ops,
  64};
  65
  66void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
  67{
  68        if (idx < ARRAY_SIZE(sh7712_clk_ops))
  69                *ops = sh7712_clk_ops[idx];
  70}
  71
  72