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/*
* arch/sh/kernel/cpu/sh2a/clock-sh7201.c
*
* SH7201 support for the clock framework
*
* Copyright (C) 2008 Peter Griffin <pgriffin@mpc-data.co.uk>
*
* Based on clock-sh4.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 const int pll1rate[]={1,2,3,4,6,8};
static const int pfc_divisors[]={1,2,3,4,6,8,12};
#define ifc_divisors pfc_divisors
static unsigned int pll2_mult;
static void master_clk_init(struct clk *clk)
{
clk->rate = 10000000 * pll2_mult *
pll1rate[(__raw_readw(FREQCR) >> 8) & 0x0007];
}
static struct sh_clk_ops sh7201_master_clk_ops = {
.init = master_clk_init,
};
static unsigned long module_clk_recalc(struct clk *clk)
{
int idx = (__raw_readw(FREQCR) & 0x0007);
return clk->parent->rate / pfc_divisors[idx];
}
static struct sh_clk_ops sh7201_module_clk_ops = {
.recalc = module_clk_recalc,
};
static unsigned long bus_clk_recalc(struct clk *clk)
{
int idx = (__raw_readw(FREQCR) & 0x0007);
return clk->parent->rate / pfc_divisors[idx];
}
static struct sh_clk_ops sh7201_bus_clk_ops = {
.recalc = bus_clk_recalc,
};
static unsigned long cpu_clk_recalc(struct clk *clk)
{
int idx = ((__raw_readw(FREQCR) >> 4) & 0x0007);
return clk->parent->rate / ifc_divisors[idx];
}
static struct sh_clk_ops sh7201_cpu_clk_ops = {
.recalc = cpu_clk_recalc,
};
static struct sh_clk_ops *sh7201_clk_ops[] = {
&sh7201_master_clk_ops,
&sh7201_module_clk_ops,
&sh7201_bus_clk_ops,
&sh7201_cpu_clk_ops,
};
void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
{
if (test_mode_pin(MODE_PIN1 | MODE_PIN0))
pll2_mult = 1;
else if (test_mode_pin(MODE_PIN1))
pll2_mult = 2;
else
pll2_mult = 4;
if (idx < ARRAY_SIZE(sh7201_clk_ops))
*ops = sh7201_clk_ops[idx];
}
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