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Paul Mundt
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Jan 28, 2008
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--- | ||
refs/heads/master: ff1b7506051014cc38036401b89e426bf3d6a608 | ||
refs/heads/master: 6d01f51086cf6c475470cdae67d2f45e5fb57833 |
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/* | ||
* arch/sh/kernel/cpu/sh2a/clock-sh7203.c | ||
* | ||
* SH7203 support for the clock framework | ||
* | ||
* Copyright (C) 2007 Kieran Bingham (MPC-Data Ltd) | ||
* | ||
* Based on clock-sh7263.c | ||
* Copyright (C) 2006 Yoshinori Sato | ||
* | ||
* Based on clock-sh4.c | ||
* Copyright (C) 2005 Paul Mundt | ||
* | ||
* This file is subject to the terms and conditions of the GNU General Public | ||
* License. See the file "COPYING" in the main directory of this archive | ||
* for more details. | ||
*/ | ||
#include <linux/init.h> | ||
#include <linux/kernel.h> | ||
#include <asm/clock.h> | ||
#include <asm/freq.h> | ||
#include <asm/io.h> | ||
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const static int pll1rate[]={8,12,16,0}; | ||
const static int pfc_divisors[]={1,2,3,4,6,8,12}; | ||
#define ifc_divisors pfc_divisors | ||
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#if (CONFIG_SH_CLK_MD == 0) | ||
#define PLL2 (1) | ||
#elif (CONFIG_SH_CLK_MD == 1) | ||
#define PLL2 (2) | ||
#elif (CONFIG_SH_CLK_MD == 2) | ||
#define PLL2 (4) | ||
#elif (CONFIG_SH_CLK_MD == 3) | ||
#define PLL2 (4) | ||
#else | ||
#error "Illegal Clock Mode!" | ||
#endif | ||
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static void master_clk_init(struct clk *clk) | ||
{ | ||
clk->rate *= pll1rate[(ctrl_inw(FREQCR) >> 8) & 0x0003] * PLL2 ; | ||
} | ||
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static struct clk_ops sh7203_master_clk_ops = { | ||
.init = master_clk_init, | ||
}; | ||
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static void module_clk_recalc(struct clk *clk) | ||
{ | ||
int idx = (ctrl_inw(FREQCR) & 0x0007); | ||
clk->rate = clk->parent->rate / pfc_divisors[idx]; | ||
} | ||
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static struct clk_ops sh7203_module_clk_ops = { | ||
.recalc = module_clk_recalc, | ||
}; | ||
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static void bus_clk_recalc(struct clk *clk) | ||
{ | ||
int idx = (ctrl_inw(FREQCR) & 0x0007); | ||
clk->rate = clk->parent->rate / pfc_divisors[idx-2]; | ||
} | ||
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static struct clk_ops sh7203_bus_clk_ops = { | ||
.recalc = bus_clk_recalc, | ||
}; | ||
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static void cpu_clk_recalc(struct clk *clk) | ||
{ | ||
clk->rate = clk->parent->rate; | ||
} | ||
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static struct clk_ops sh7203_cpu_clk_ops = { | ||
.recalc = cpu_clk_recalc, | ||
}; | ||
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static struct clk_ops *sh7203_clk_ops[] = { | ||
&sh7203_master_clk_ops, | ||
&sh7203_module_clk_ops, | ||
&sh7203_bus_clk_ops, | ||
&sh7203_cpu_clk_ops, | ||
}; | ||
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void __init arch_init_clk_ops(struct clk_ops **ops, int idx) | ||
{ | ||
if (idx < ARRAY_SIZE(sh7203_clk_ops)) | ||
*ops = sh7203_clk_ops[idx]; | ||
} |
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