arch/arm/mach-versatile/clock.c

   1 /*
   2  *  linux/arch/arm/mach-versatile/clock.c
   3  *
   4  *  Copyright (C) 2004 ARM Limited.
   5  *  Written by Deep Blue Solutions Limited.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/device.h>
  14 #include <linux/list.h>
  15 #include <linux/errno.h>
  16 #include <linux/err.h>
  17 #include <linux/string.h>
  18 #include <linux/clk.h>
  19 #include <linux/mutex.h>
  20
  21 #include <asm/clkdev.h>
  22 #include <asm/hardware/icst307.h>
  23
  24 #include "clock.h"
  25
  26 int clk_enable(struct clk *clk)
  27 {
  28         return 0;
  29 }
  30 EXPORT_SYMBOL(clk_enable);
  31
  32 void clk_disable(struct clk *clk)
  33 {
  34 }
  35 EXPORT_SYMBOL(clk_disable);
  36
  37 unsigned long clk_get_rate(struct clk *clk)
  38 {
  39         return clk->rate;
  40 }
  41 EXPORT_SYMBOL(clk_get_rate);
  42
  43 long clk_round_rate(struct clk *clk, unsigned long rate)
  44 {
  45         struct icst307_vco vco;
  46         vco = icst307_khz_to_vco(clk->params, rate / 1000);
  47         return icst307_khz(clk->params, vco) * 1000;
  48 }
  49 EXPORT_SYMBOL(clk_round_rate);
  50
  51 int clk_set_rate(struct clk *clk, unsigned long rate)
  52 {
  53         int ret = -EIO;
  54
  55         if (clk->setvco) {
  56                 struct icst307_vco vco;
  57
  58                 vco = icst307_khz_to_vco(clk->params, rate / 1000);
  59                 clk->rate = icst307_khz(clk->params, vco) * 1000;
  60                 clk->setvco(clk, vco);
  61                 ret = 0;
  62         }
  63         return ret;
  64 }
  65 EXPORT_SYMBOL(clk_set_rate);