mirror of https://gitee.com/openkylin/linux.git
115 lines
2.1 KiB
C
115 lines
2.1 KiB
C
/* arch/arm/mach-lh7a40x/clocks.c
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*
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* Copyright (C) 2004 Marc Singer
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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*/
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#include <linux/cpufreq.h>
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#include <mach/hardware.h>
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#include <mach/clocks.h>
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#include <linux/err.h>
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struct module;
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struct clk {
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struct list_head node;
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unsigned long rate;
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struct module *owner;
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const char *name;
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};
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/* ----- */
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#define MAINDIV1(c) (((c) >> 7) & 0x0f)
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#define MAINDIV2(c) (((c) >> 11) & 0x1f)
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#define PS(c) (((c) >> 18) & 0x03)
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#define PREDIV(c) (((c) >> 2) & 0x1f)
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#define HCLKDIV(c) (((c) >> 0) & 0x02)
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#define PCLKDIV(c) (((c) >> 16) & 0x03)
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unsigned int cpufreq_get (unsigned int cpu) /* in kHz */
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{
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return fclkfreq_get ()/1000;
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}
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EXPORT_SYMBOL(cpufreq_get);
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unsigned int fclkfreq_get (void)
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{
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unsigned int clkset = CSC_CLKSET;
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unsigned int gclk
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= XTAL_IN
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/ (1 << PS(clkset))
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* (MAINDIV1(clkset) + 2)
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/ (PREDIV(clkset) + 2)
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* (MAINDIV2(clkset) + 2)
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;
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return gclk;
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}
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unsigned int hclkfreq_get (void)
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{
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unsigned int clkset = CSC_CLKSET;
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unsigned int hclk = fclkfreq_get () / (HCLKDIV(clkset) + 1);
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return hclk;
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}
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unsigned int pclkfreq_get (void)
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{
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unsigned int clkset = CSC_CLKSET;
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int pclkdiv = PCLKDIV(clkset);
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unsigned int pclk;
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if (pclkdiv == 0x3)
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pclkdiv = 0x2;
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pclk = hclkfreq_get () / (1 << pclkdiv);
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return pclk;
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}
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/* ----- */
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struct clk *clk_get (struct device *dev, const char *id)
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{
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return dev && strcmp(dev_name(dev), "cldc-lh7a40x") == 0
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? NULL : ERR_PTR(-ENOENT);
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}
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EXPORT_SYMBOL(clk_get);
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void clk_put (struct clk *clk)
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{
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}
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EXPORT_SYMBOL(clk_put);
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int clk_enable (struct clk *clk)
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{
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return 0;
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}
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EXPORT_SYMBOL(clk_enable);
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void clk_disable (struct clk *clk)
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{
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}
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EXPORT_SYMBOL(clk_disable);
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unsigned long clk_get_rate (struct clk *clk)
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{
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return 0;
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}
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EXPORT_SYMBOL(clk_get_rate);
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long clk_round_rate (struct clk *clk, unsigned long rate)
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{
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return rate;
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}
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EXPORT_SYMBOL(clk_round_rate);
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int clk_set_rate (struct clk *clk, unsigned long rate)
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{
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return -EIO;
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}
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EXPORT_SYMBOL(clk_set_rate);
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