36ddf31b68
This adds a relatively simplistic clock framework for sh. The initial goal behind this is to clean up the arch/sh/kernel/time.c mess and to get the CPU subtype-specific frequency setting and calculation code moved somewhere more sensible. This only deals with the core clocks at the moment, though it's trivial for other drivers to define their own clocks as desired. Signed-off-by: Paul Mundt <lethal@linux-sh.org> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/*
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* arch/sh/kernel/cpu/sh4/clock-sh73180.c
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*
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* SH73180 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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/*
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* SH73180 uses a common set of divisors, so this is quite simple..
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*/
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static int divisors[] = { 1, 2, 3, 4, 6, 8, 12, 16 };
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static void master_clk_init(struct clk *clk)
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{
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clk->rate *= divisors[ctrl_inl(FRQCR) & 0x0007];
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}
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static struct clk_ops sh73180_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) & 0x0007);
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clk->rate = clk->parent->rate / divisors[idx];
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}
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static struct clk_ops sh73180_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) >> 12) & 0x0007;
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clk->rate = clk->parent->rate / divisors[idx];
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}
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static struct clk_ops sh73180_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) >> 20) & 0x0007;
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clk->rate = clk->parent->rate / divisors[idx];
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}
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static struct clk_ops sh73180_cpu_clk_ops = {
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.recalc = cpu_clk_recalc,
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};
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static struct clk_ops *sh73180_clk_ops[] = {
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&sh73180_master_clk_ops,
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&sh73180_module_clk_ops,
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&sh73180_bus_clk_ops,
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&sh73180_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(sh73180_clk_ops))
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*ops = sh73180_clk_ops[idx];
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}
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