74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/*
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* arch/sh/kernel/cpu/sh4a/clock-sh7770.c
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*
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* SH7770 support for the clock framework
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*
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* Copyright (C) 2005 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <asm/clock.h>
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#include <asm/freq.h>
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#include <asm/io.h>
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static int ifc_divisors[] = { 1, 1, 1, 1, 1, 1, 1, 1 };
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static int bfc_divisors[] = { 1, 1, 1, 1, 1, 8,12, 1 };
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static int pfc_divisors[] = { 1, 8, 1,10,12,16, 1, 1 };
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static void master_clk_init(struct clk *clk)
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{
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clk->rate *= pfc_divisors[(ctrl_inl(FRQCR) >> 28) & 0x000f];
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}
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static struct clk_ops sh7770_master_clk_ops = {
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.init = master_clk_init,
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};
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static void module_clk_recalc(struct clk *clk)
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{
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int idx = ((ctrl_inl(FRQCR) >> 28) & 0x000f);
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clk->rate = clk->parent->rate / pfc_divisors[idx];
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}
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static struct clk_ops sh7770_module_clk_ops = {
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.recalc = module_clk_recalc,
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};
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static void bus_clk_recalc(struct clk *clk)
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{
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int idx = (ctrl_inl(FRQCR) & 0x000f);
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clk->rate = clk->parent->rate / bfc_divisors[idx];
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}
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static struct clk_ops sh7770_bus_clk_ops = {
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.recalc = bus_clk_recalc,
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};
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static void cpu_clk_recalc(struct clk *clk)
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{
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int idx = ((ctrl_inl(FRQCR) >> 24) & 0x000f);
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clk->rate = clk->parent->rate / ifc_divisors[idx];
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}
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static struct clk_ops sh7770_cpu_clk_ops = {
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.recalc = cpu_clk_recalc,
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};
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static struct clk_ops *sh7770_clk_ops[] = {
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&sh7770_master_clk_ops,
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&sh7770_module_clk_ops,
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&sh7770_bus_clk_ops,
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&sh7770_cpu_clk_ops,
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};
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void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
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{
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if (idx < ARRAY_SIZE(sh7770_clk_ops))
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*ops = sh7770_clk_ops[idx];
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}
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