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/*
* arch/sh/kernel/cpu/sh4a/clock-sh7763.c
*
* SH7763 support for the clock framework
*
* Copyright (C) 2005 Paul Mundt
* Copyright (C) 2007 Yoshihiro Shimoda
*
* 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 <linux/io.h>
#include <linux/clkdev.h>
#include <asm/clock.h>
#include <asm/freq.h>
#include <asm/io.h>
static int bfc_divisors[] = { 1, 1, 1, 8, 1, 1, 1, 1 };
static int p0fc_divisors[] = { 1, 1, 1, 8, 1, 1, 1, 1 };
static int cfc_divisors[] = { 1, 1, 4, 1, 1, 1, 1, 1 };
static void master_clk_init(struct clk *clk)
{
clk->rate *= p0fc_divisors[(__raw_readl(FRQCR) >> 4) & 0x07];
}
static struct sh_clk_ops sh7763_master_clk_ops = {
.init = master_clk_init,
};
static unsigned long module_clk_recalc(struct clk *clk)
{
int idx = ((__raw_readl(FRQCR) >> 4) & 0x07);
return clk->parent->rate / p0fc_divisors[idx];
}
static struct sh_clk_ops sh7763_module_clk_ops = {
.recalc = module_clk_recalc,
};
static unsigned long bus_clk_recalc(struct clk *clk)
{
int idx = ((__raw_readl(FRQCR) >> 16) & 0x07);
return clk->parent->rate / bfc_divisors[idx];
}
static struct sh_clk_ops sh7763_bus_clk_ops = {
.recalc = bus_clk_recalc,
};
static struct sh_clk_ops sh7763_cpu_clk_ops = {
.recalc = followparent_recalc,
};
static struct sh_clk_ops *sh7763_clk_ops[] = {
&sh7763_master_clk_ops,
&sh7763_module_clk_ops,
&sh7763_bus_clk_ops,
&sh7763_cpu_clk_ops,
};
void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
{
if (idx < ARRAY_SIZE(sh7763_clk_ops))
*ops = sh7763_clk_ops[idx];
}
static unsigned long shyway_clk_recalc(struct clk *clk)
{
int idx = ((__raw_readl(FRQCR) >> 20) & 0x07);
return clk->parent->rate / cfc_divisors[idx];
}
static struct sh_clk_ops sh7763_shyway_clk_ops = {
.recalc = shyway_clk_recalc,
};
static struct clk sh7763_shyway_clk = {
.flags = CLK_ENABLE_ON_INIT,
.ops = &sh7763_shyway_clk_ops,
};
/*
* Additional SH7763-specific on-chip clocks that aren't already part of the
* clock framework
*/
static struct clk *sh7763_onchip_clocks[] = {
&sh7763_shyway_clk,
};
static struct clk_lookup lookups[] = {
/* main clocks */
CLKDEV_CON_ID("shyway_clk", &sh7763_shyway_clk),
};
int __init arch_clk_init(void)
{
struct clk *clk;
int i, ret = 0;
cpg_clk_init();
clk = clk_get(NULL, "master_clk");
for (i = 0; i < ARRAY_SIZE(sh7763_onchip_clocks); i++) {
struct clk *clkp = sh7763_onchip_clocks[i];
clkp->parent = clk;
ret |= clk_register(clkp);
}
clk_put(clk);
clkdev_add_table(lookups, ARRAY_SIZE(lookups));
return ret;
}
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