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/*
* 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 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 sh7709_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 sh7709_module_clk_ops = {
.recalc = module_clk_recalc,
};
static unsigned long bus_clk_recalc(struct clk *clk)
{
int frqcr = __raw_readw(FRQCR);
int idx = (frqcr & 0x0080) ?
((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1;
return clk->parent->rate * stc_multipliers[idx];
}
static struct clk_ops sh7709_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 sh7709_cpu_clk_ops = {
.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];
}
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