linux/arch/sh/kernel/cpu/sh2a/clock-sh7203.c
Paul Mundt a02cb230bb sh: clkfwk: Add a followparent_recalc() helper.
This adds a followparent_recalc() helper for clocks that just follow the
parent's rate. Switch over the few CPUs that use this scheme for some of
their clocks.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-12 03:50:44 +09:00

85 lines
1.9 KiB
C

/*
* arch/sh/kernel/cpu/sh2a/clock-sh7203.c
*
* SH7203 support for the clock framework
*
* Copyright (C) 2007 Kieran Bingham (MPC-Data Ltd)
*
* Based on clock-sh7263.c
* Copyright (C) 2006 Yoshinori Sato
*
* 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[]={8,12,16,0};
static const int pfc_divisors[]={1,2,3,4,6,8,12};
#define ifc_divisors pfc_divisors
#if (CONFIG_SH_CLK_MD == 0)
#define PLL2 (1)
#elif (CONFIG_SH_CLK_MD == 1)
#define PLL2 (2)
#elif (CONFIG_SH_CLK_MD == 2)
#define PLL2 (4)
#elif (CONFIG_SH_CLK_MD == 3)
#define PLL2 (4)
#else
#error "Illegal Clock Mode!"
#endif
static void master_clk_init(struct clk *clk)
{
clk->rate *= pll1rate[(ctrl_inw(FREQCR) >> 8) & 0x0003] * PLL2 ;
}
static struct clk_ops sh7203_master_clk_ops = {
.init = master_clk_init,
};
static unsigned long module_clk_recalc(struct clk *clk)
{
int idx = (ctrl_inw(FREQCR) & 0x0007);
return clk->parent->rate / pfc_divisors[idx];
}
static struct clk_ops sh7203_module_clk_ops = {
.recalc = module_clk_recalc,
};
static unsigned long bus_clk_recalc(struct clk *clk)
{
int idx = (ctrl_inw(FREQCR) & 0x0007);
return clk->parent->rate / pfc_divisors[idx-2];
}
static struct clk_ops sh7203_bus_clk_ops = {
.recalc = bus_clk_recalc,
};
static struct clk_ops sh7203_cpu_clk_ops = {
.recalc = followparent_recalc,
};
static struct clk_ops *sh7203_clk_ops[] = {
&sh7203_master_clk_ops,
&sh7203_module_clk_ops,
&sh7203_bus_clk_ops,
&sh7203_cpu_clk_ops,
};
void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
{
if (idx < ARRAY_SIZE(sh7203_clk_ops))
*ops = sh7203_clk_ops[idx];
}