90 строки
2.1 KiB
C
90 строки
2.1 KiB
C
/*
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* arch/sh/kernel/cpu/sh3/clock-sh3.c
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*
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* Generic SH-3 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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* FRQCR parsing hacked out of arch/sh/kernel/time.c
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*
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* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
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* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
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* Copyright (C) 2002, 2003, 2004 Paul Mundt
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* Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org>
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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 stc_multipliers[] = { 1, 2, 3, 4, 6, 1, 1, 1 };
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static int ifc_divisors[] = { 1, 2, 3, 4, 1, 1, 1, 1 };
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static int pfc_divisors[] = { 1, 2, 3, 4, 6, 1, 1, 1 };
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static void master_clk_init(struct clk *clk)
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{
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int frqcr = ctrl_inw(FRQCR);
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int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
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clk->rate *= pfc_divisors[idx];
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}
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static struct clk_ops sh3_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 frqcr = ctrl_inw(FRQCR);
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int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
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clk->rate = clk->parent->rate / pfc_divisors[idx];
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}
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static struct clk_ops sh3_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 frqcr = ctrl_inw(FRQCR);
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int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4);
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clk->rate = clk->parent->rate / stc_multipliers[idx];
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}
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static struct clk_ops sh3_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 frqcr = ctrl_inw(FRQCR);
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int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
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clk->rate = clk->parent->rate / ifc_divisors[idx];
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}
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static struct clk_ops sh3_cpu_clk_ops = {
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.recalc = cpu_clk_recalc,
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};
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static struct clk_ops *sh3_clk_ops[] = {
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&sh3_master_clk_ops,
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&sh3_module_clk_ops,
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&sh3_bus_clk_ops,
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&sh3_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(sh3_clk_ops))
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*ops = sh3_clk_ops[idx];
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}
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