80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/*
|
|
* arch/sh/kernel/cpu/sh5/clock-sh5.c
|
|
*
|
|
* SH-5 support for the clock framework
|
|
*
|
|
* Copyright (C) 2008 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/io.h>
|
|
|
|
static int ifc_table[] = { 2, 4, 6, 8, 10, 12, 16, 24 };
|
|
|
|
/* Clock, Power and Reset Controller */
|
|
#define CPRC_BLOCK_OFF 0x01010000
|
|
#define CPRC_BASE (PHYS_PERIPHERAL_BLOCK + CPRC_BLOCK_OFF)
|
|
|
|
static unsigned long cprc_base;
|
|
|
|
static void master_clk_init(struct clk *clk)
|
|
{
|
|
int idx = (ctrl_inl(cprc_base + 0x00) >> 6) & 0x0007;
|
|
clk->rate *= ifc_table[idx];
|
|
}
|
|
|
|
static struct clk_ops sh5_master_clk_ops = {
|
|
.init = master_clk_init,
|
|
};
|
|
|
|
static void module_clk_recalc(struct clk *clk)
|
|
{
|
|
int idx = (ctrl_inw(cprc_base) >> 12) & 0x0007;
|
|
clk->rate = clk->parent->rate / ifc_table[idx];
|
|
}
|
|
|
|
static struct clk_ops sh5_module_clk_ops = {
|
|
.recalc = module_clk_recalc,
|
|
};
|
|
|
|
static void bus_clk_recalc(struct clk *clk)
|
|
{
|
|
int idx = (ctrl_inw(cprc_base) >> 3) & 0x0007;
|
|
clk->rate = clk->parent->rate / ifc_table[idx];
|
|
}
|
|
|
|
static struct clk_ops sh5_bus_clk_ops = {
|
|
.recalc = bus_clk_recalc,
|
|
};
|
|
|
|
static void cpu_clk_recalc(struct clk *clk)
|
|
{
|
|
int idx = (ctrl_inw(cprc_base) & 0x0007);
|
|
clk->rate = clk->parent->rate / ifc_table[idx];
|
|
}
|
|
|
|
static struct clk_ops sh5_cpu_clk_ops = {
|
|
.recalc = cpu_clk_recalc,
|
|
};
|
|
|
|
static struct clk_ops *sh5_clk_ops[] = {
|
|
&sh5_master_clk_ops,
|
|
&sh5_module_clk_ops,
|
|
&sh5_bus_clk_ops,
|
|
&sh5_cpu_clk_ops,
|
|
};
|
|
|
|
void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
|
|
{
|
|
cprc_base = onchip_remap(CPRC_BASE, 1024, "CPRC");
|
|
BUG_ON(!cprc_base);
|
|
|
|
if (idx < ARRAY_SIZE(sh5_clk_ops))
|
|
*ops = sh5_clk_ops[idx];
|
|
}
|