86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
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/*
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* arch/sh/kernel/cpu/sh2a/clock-sh7201.c
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*
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* SH7201 support for the clock framework
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*
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* Copyright (C) 2008 Peter Griffin <pgriffin@mpc-data.co.uk>
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*
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* Based on clock-sh4.c
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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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const static int pll1rate[]={1,2,3,4,6,8};
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const static int pfc_divisors[]={1,2,3,4,6,8,12};
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#define ifc_divisors pfc_divisors
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#if (CONFIG_SH_CLK_MD == 0)
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#define PLL2 (4)
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#elif (CONFIG_SH_CLK_MD == 2)
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#define PLL2 (2)
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#elif (CONFIG_SH_CLK_MD == 3)
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#define PLL2 (1)
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#else
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#error "Illegal Clock Mode!"
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#endif
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static void master_clk_init(struct clk *clk)
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{
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clk->rate = 10000000 * PLL2 * pll1rate[(ctrl_inw(FREQCR) >> 8) & 0x0007];
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}
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static struct clk_ops sh7201_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_inw(FREQCR) & 0x0007);
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clk->rate = clk->parent->rate / pfc_divisors[idx];
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}
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static struct clk_ops sh7201_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_inw(FREQCR) & 0x0007);
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clk->rate = clk->parent->rate / pfc_divisors[idx];
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}
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static struct clk_ops sh7201_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_inw(FREQCR) >> 4) & 0x0007);
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clk->rate = clk->parent->rate / ifc_divisors[idx];
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}
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static struct clk_ops sh7201_cpu_clk_ops = {
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.recalc = cpu_clk_recalc,
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};
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static struct clk_ops *sh7201_clk_ops[] = {
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&sh7201_master_clk_ops,
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&sh7201_module_clk_ops,
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&sh7201_bus_clk_ops,
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&sh7201_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(sh7201_clk_ops))
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*ops = sh7201_clk_ops[idx];
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}
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