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/*
* arch/sh/kernel/cpu/sh4a/clock-sh7786.c
*
* SH7786 support for the clock framework
*
* Copyright (C) 2008, 2009 Renesas Solutions Corp.
* Kuninori Morimoto <morimoto.kuninori@renesas.com>
*
* Based on SH7785
* Copyright (C) 2007 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 ifc_divisors[] = { 1, 2, 4, 1 };
static int sfc_divisors[] = { 1, 1, 4, 1 };
static int bfc_divisors[] = { 1, 1, 1, 1, 1, 12, 16, 1,
24, 32, 1, 1, 1, 1, 1, 1 };
static int mfc_divisors[] = { 1, 1, 4, 1 };
static int pfc_divisors[] = { 1, 1, 1, 1, 1, 1, 16, 1,
24, 32, 1, 48, 1, 1, 1, 1 };
static void master_clk_init(struct clk *clk)
{
clk->rate *= pfc_divisors[ctrl_inl(FRQMR1) & 0x000f];
}
static struct clk_ops sh7786_master_clk_ops = {
.init = master_clk_init,
};
static unsigned long module_clk_recalc(struct clk *clk)
{
int idx = (ctrl_inl(FRQMR1) & 0x000f);
return clk->parent->rate / pfc_divisors[idx];
}
static struct clk_ops sh7786_module_clk_ops = {
.recalc = module_clk_recalc,
};
static unsigned long bus_clk_recalc(struct clk *clk)
{
int idx = ((ctrl_inl(FRQMR1) >> 16) & 0x000f);
return clk->parent->rate / bfc_divisors[idx];
}
static struct clk_ops sh7786_bus_clk_ops = {
.recalc = bus_clk_recalc,
};
static unsigned long cpu_clk_recalc(struct clk *clk)
{
int idx = ((ctrl_inl(FRQMR1) >> 28) & 0x0003);
return clk->parent->rate / ifc_divisors[idx];
}
static struct clk_ops sh7786_cpu_clk_ops = {
.recalc = cpu_clk_recalc,
};
static struct clk_ops *sh7786_clk_ops[] = {
&sh7786_master_clk_ops,
&sh7786_module_clk_ops,
&sh7786_bus_clk_ops,
&sh7786_cpu_clk_ops,
};
void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
{
if (idx < ARRAY_SIZE(sh7786_clk_ops))
*ops = sh7786_clk_ops[idx];
}
static unsigned long shyway_clk_recalc(struct clk *clk)
{
int idx = ((ctrl_inl(FRQMR1) >> 20) & 0x0003);
return clk->parent->rate / sfc_divisors[idx];
}
static struct clk_ops sh7786_shyway_clk_ops = {
.recalc = shyway_clk_recalc,
};
static struct clk sh7786_shyway_clk = {
.name = "shyway_clk",
.flags = CLK_ENABLE_ON_INIT,
.ops = &sh7786_shyway_clk_ops,
};
static unsigned long ddr_clk_recalc(struct clk *clk)
{
int idx = ((ctrl_inl(FRQMR1) >> 12) & 0x0003);
return clk->parent->rate / mfc_divisors[idx];
}
static struct clk_ops sh7786_ddr_clk_ops = {
.recalc = ddr_clk_recalc,
};
static struct clk sh7786_ddr_clk = {
.name = "ddr_clk",
.flags = CLK_ENABLE_ON_INIT,
.ops = &sh7786_ddr_clk_ops,
};
/*
* Additional SH7786-specific on-chip clocks that aren't already part of the
* clock framework
*/
static struct clk *sh7786_onchip_clocks[] = {
&sh7786_shyway_clk,
&sh7786_ddr_clk,
};
static int __init sh7786_clk_init(void)
{
struct clk *clk = clk_get(NULL, "master_clk");
int i, ret = 0;
for (i = 0; i < ARRAY_SIZE(sh7786_onchip_clocks); i++) {
struct clk *clkp = sh7786_onchip_clocks[i];
clkp->parent = clk;
ret |= clk_register(clkp);
}
clk_put(clk);
return ret;
}
arch_initcall(sh7786_clk_init);
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