forked from Minki/linux
a02cb230bb
This adds a followparent_recalc() helper for clocks that just follow the parent's rate. Switch over the few CPUs that use this scheme for some of their clocks. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* arch/sh/kernel/cpu/sh2a/clock-sh7203.c
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*
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* SH7203 support for the clock framework
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*
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* Copyright (C) 2007 Kieran Bingham (MPC-Data Ltd)
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*
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* Based on clock-sh7263.c
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* Copyright (C) 2006 Yoshinori Sato
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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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static const int pll1rate[]={8,12,16,0};
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static const 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 (1)
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#elif (CONFIG_SH_CLK_MD == 1)
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#define PLL2 (2)
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#elif (CONFIG_SH_CLK_MD == 2)
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#define PLL2 (4)
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#elif (CONFIG_SH_CLK_MD == 3)
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#define PLL2 (4)
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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 *= pll1rate[(ctrl_inw(FREQCR) >> 8) & 0x0003] * PLL2 ;
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}
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static struct clk_ops sh7203_master_clk_ops = {
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.init = master_clk_init,
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};
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static unsigned long module_clk_recalc(struct clk *clk)
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{
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int idx = (ctrl_inw(FREQCR) & 0x0007);
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return clk->parent->rate / pfc_divisors[idx];
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}
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static struct clk_ops sh7203_module_clk_ops = {
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.recalc = module_clk_recalc,
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};
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static unsigned long bus_clk_recalc(struct clk *clk)
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{
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int idx = (ctrl_inw(FREQCR) & 0x0007);
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return clk->parent->rate / pfc_divisors[idx-2];
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}
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static struct clk_ops sh7203_bus_clk_ops = {
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.recalc = bus_clk_recalc,
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};
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static struct clk_ops sh7203_cpu_clk_ops = {
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.recalc = followparent_recalc,
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};
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static struct clk_ops *sh7203_clk_ops[] = {
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&sh7203_master_clk_ops,
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&sh7203_module_clk_ops,
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&sh7203_bus_clk_ops,
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&sh7203_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(sh7203_clk_ops))
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*ops = sh7203_clk_ops[idx];
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}
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