LXR linux/arch/sh/kernel/cpu/sh2/clock-sh7619.c

   1/*
   2 * arch/sh/kernel/cpu/sh2/clock-sh7619.c
   3 *
   4 * SH7619 support for the clock framework
   5 *
   6 *  Copyright (C) 2006  Yoshinori Sato
   7 *
   8 * Based on clock-sh4.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 const int pll1rate[] = {1,2};
  22static const int pfc_divisors[] = {1,2,0,4};
  23
  24#if (CONFIG_SH_CLK_MD == 1) || (CONFIG_SH_CLK_MD == 2)
  25#define PLL2 (4)
  26#elif (CONFIG_SH_CLK_MD == 5) || (CONFIG_SH_CLK_MD == 6)
  27#define PLL2 (2)
  28#else
  29#error "Illigal Clock Mode!"
  30#endif
  31
  32static void master_clk_init(struct clk *clk)
  33{
  34        clk->rate *= PLL2 * pll1rate[(ctrl_inw(FREQCR) >> 8) & 7];
  35}
  36
  37static struct clk_ops sh7619_master_clk_ops = {
  38        .init           = master_clk_init,
  39};
  40
  41static unsigned long module_clk_recalc(struct clk *clk)
  42{
  43        int idx = (ctrl_inw(FREQCR) & 0x0007);
  44        return clk->parent->rate / pfc_divisors[idx];
  45}
  46
  47static struct clk_ops sh7619_module_clk_ops = {
  48        .recalc         = module_clk_recalc,
  49};
  50
  51static unsigned long bus_clk_recalc(struct clk *clk)
  52{
  53        return clk->parent->rate / pll1rate[(ctrl_inw(FREQCR) >> 8) & 7];
  54}
  55
  56static struct clk_ops sh7619_bus_clk_ops = {
  57        .recalc         = bus_clk_recalc,
  58};
  59
  60static struct clk_ops sh7619_cpu_clk_ops = {
  61        .recalc         = followparent_recalc,
  62};
  63
  64static struct clk_ops *sh7619_clk_ops[] = {
  65        &sh7619_master_clk_ops,
  66        &sh7619_module_clk_ops,
  67        &sh7619_bus_clk_ops,
  68        &sh7619_cpu_clk_ops,
  69};
  70
  71void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
  72{
  73        if (idx < ARRAY_SIZE(sh7619_clk_ops))
  74                *ops = sh7619_clk_ops[idx];
  75}
  76