// SPDX-License-Identifier: GPL-2.0
/*
* arch / sh / kernel / cpu / sh3 / clock - sh7705 . c
*
* SH7705 support for the clock framework
*
* Copyright ( C ) 2005 Paul Mundt
*
* FRQCR parsing hacked out of arch / sh / kernel / time . c
*
* Copyright ( C ) 1999 Tetsuya Okada & Niibe Yutaka
* Copyright ( C ) 2000 Philipp Rumpf < prumpf @ tux . org >
* Copyright ( C ) 2002 , 2003 , 2004 Paul Mundt
* Copyright ( C ) 2002 M . R . Brown < mrbrown @ linux - sh . org >
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <asm /clock.h>
#include <asm /freq.h>
#include <asm /io.h>
/*
* SH7705 uses the same divisors as the generic SH - 3 case , it ' s just the
* FRQCR layout that is a bit different . .
*/
static int stc_multipliers[] = { 1 , 2 , 3 , 4 , 6 , 1 , 1 , 1 };
static int ifc_divisors[] = { 1 , 2 , 3 , 4 , 1 , 1 , 1 , 1 };
static int pfc_divisors[] = { 1 , 2 , 3 , 4 , 6 , 1 , 1 , 1 };
static void master_clk_init(struct clk *clk)
{
clk->rate *= pfc_divisors[__raw_readw(FRQCR) & 0 x0003];
}
static struct sh_clk_ops sh7705_master_clk_ops = {
.init = master_clk_init,
};
static unsigned long module_clk_recalc(struct clk *clk)
{
int idx = __raw_readw(FRQCR) & 0 x0003;
return clk->parent->rate / pfc_divisors[idx];
}
static struct sh_clk_ops sh7705_module_clk_ops = {
.recalc = module_clk_recalc,
};
static unsigned long bus_clk_recalc(struct clk *clk)
{
int idx = (__raw_readw(FRQCR) & 0 x0300) >> 8 ;
return clk->parent->rate / stc_multipliers[idx];
}
static struct sh_clk_ops sh7705_bus_clk_ops = {
.recalc = bus_clk_recalc,
};
static unsigned long cpu_clk_recalc(struct clk *clk)
{
int idx = (__raw_readw(FRQCR) & 0 x0030) >> 4 ;
return clk->parent->rate / ifc_divisors[idx];
}
static struct sh_clk_ops sh7705_cpu_clk_ops = {
.recalc = cpu_clk_recalc,
};
static struct sh_clk_ops *sh7705_clk_ops[] = {
&sh7705_master_clk_ops,
&sh7705_module_clk_ops,
&sh7705_bus_clk_ops,
&sh7705_cpu_clk_ops,
};
void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
{
if (idx < ARRAY_SIZE(sh7705_clk_ops))
*ops = sh7705_clk_ops[idx];
}
Messung V0.5 in Prozent C=97 H=87 G=91
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-10-03)
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