arch/arm/mach-realview/clock.c

   1 /*
   2  *  linux/arch/arm/mach-realview/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/hardware/icst307.h>
  22
  23 #include "clock.h"
  24
  25 int clk_enable(struct clk *clk)
  26 {
  27         return 0;
  28 }
  29 EXPORT_SYMBOL(clk_enable);
  30
  31 void clk_disable(struct clk *clk)
  32 {
  33 }
  34 EXPORT_SYMBOL(clk_disable);
  35
  36 unsigned long clk_get_rate(struct clk *clk)
  37 {
  38         return clk->rate;
  39 }
  40 EXPORT_SYMBOL(clk_get_rate);
  41
  42 long clk_round_rate(struct clk *clk, unsigned long rate)
  43 {
  44         struct icst307_vco vco;
  45         vco = icst307_khz_to_vco(clk->params, rate / 1000);
  46         return icst307_khz(clk->params, vco) * 1000;
  47 }
  48 EXPORT_SYMBOL(clk_round_rate);
  49
  50 int clk_set_rate(struct clk *clk, unsigned long rate)
  51 {
  52         int ret = -EIO;
  53
  54         if (clk->setvco) {
  55                 struct icst307_vco vco;
  56
  57                 vco = icst307_khz_to_vco(clk->params, rate / 1000);
  58                 clk->rate = icst307_khz(clk->params, vco) * 1000;
  59                 clk->setvco(clk, vco);
  60                 ret = 0;
  61         }
  62         return ret;
  63 }
  64 EXPORT_SYMBOL(clk_set_rate);