72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/*
|
|
* arch/sh/kernel/cpu/sh3/clock-sh7712.c
|
|
*
|
|
* SH7712 support for the clock framework
|
|
*
|
|
* Copyright (C) 2007 Andrew Murray <amurray@mpc-data.co.uk>
|
|
*
|
|
* Based on arch/sh/kernel/cpu/sh3/clock-sh3.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 multipliers[] = { 1, 2, 3 };
|
|
static int divisors[] = { 1, 2, 3, 4, 6 };
|
|
|
|
static void master_clk_init(struct clk *clk)
|
|
{
|
|
int frqcr = ctrl_inw(FRQCR);
|
|
int idx = (frqcr & 0x0300) >> 8;
|
|
|
|
clk->rate *= multipliers[idx];
|
|
}
|
|
|
|
static struct clk_ops sh7712_master_clk_ops = {
|
|
.init = master_clk_init,
|
|
};
|
|
|
|
static unsigned long module_clk_recalc(struct clk *clk)
|
|
{
|
|
int frqcr = ctrl_inw(FRQCR);
|
|
int idx = frqcr & 0x0007;
|
|
|
|
return clk->parent->rate / divisors[idx];
|
|
}
|
|
|
|
static struct clk_ops sh7712_module_clk_ops = {
|
|
.recalc = module_clk_recalc,
|
|
};
|
|
|
|
static unsigned long cpu_clk_recalc(struct clk *clk)
|
|
{
|
|
int frqcr = ctrl_inw(FRQCR);
|
|
int idx = (frqcr & 0x0030) >> 4;
|
|
|
|
return clk->parent->rate / divisors[idx];
|
|
}
|
|
|
|
static struct clk_ops sh7712_cpu_clk_ops = {
|
|
.recalc = cpu_clk_recalc,
|
|
};
|
|
|
|
static struct clk_ops *sh7712_clk_ops[] = {
|
|
&sh7712_master_clk_ops,
|
|
&sh7712_module_clk_ops,
|
|
&sh7712_cpu_clk_ops,
|
|
};
|
|
|
|
void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
|
|
{
|
|
if (idx < ARRAY_SIZE(sh7712_clk_ops))
|
|
*ops = sh7712_clk_ops[idx];
|
|
}
|
|
|