arch/arm/mach-lh7a40x/clocks.c

   1 /* arch/arm/mach-lh7a40x/clocks.c
   2  *
   3  *  Copyright (C) 2004 Marc Singer
   4  *
   5  *  This program is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU General Public License
   7  *  version 2 as published by the Free Software Foundation.
   8  *
   9  */
  10
  11 #include <linux/cpufreq.h>
  12 #include <mach/hardware.h>
  13 #include <mach/clocks.h>
  14 #include <linux/err.h>
  15
  16 struct module;
  17
  18 struct clk {
  19         struct list_head node;
  20         unsigned long rate;
  21         struct module *owner;
  22         const char *name;
  23 };
  24
  25 /* ----- */
  26
  27 #define MAINDIV1(c)     (((c) >>  7) & 0x0f)
  28 #define MAINDIV2(c)     (((c) >> 11) & 0x1f)
  29 #define PS(c)           (((c) >> 18) & 0x03)
  30 #define PREDIV(c)       (((c) >>  2) & 0x1f)
  31 #define HCLKDIV(c)      (((c) >>  0) & 0x02)
  32 #define PCLKDIV(c)      (((c) >> 16) & 0x03)
  33
  34 unsigned int cpufreq_get (unsigned int cpu) /* in kHz */
  35 {
  36         return fclkfreq_get ()/1000;
  37 }
  38 EXPORT_SYMBOL(cpufreq_get);
  39
  40 unsigned int fclkfreq_get (void)
  41 {
  42         unsigned int clkset = CSC_CLKSET;
  43         unsigned int gclk
  44                 = XTAL_IN
  45                 / (1 << PS(clkset))
  46                 * (MAINDIV1(clkset) + 2)
  47                 / (PREDIV(clkset)   + 2)
  48                 * (MAINDIV2(clkset) + 2)
  49                 ;
  50         return gclk;
  51 }
  52
  53 unsigned int hclkfreq_get (void)
  54 {
  55         unsigned int clkset = CSC_CLKSET;
  56         unsigned int hclk = fclkfreq_get () / (HCLKDIV(clkset) + 1);
  57
  58         return hclk;
  59 }
  60
  61 unsigned int pclkfreq_get (void)
  62 {
  63         unsigned int clkset = CSC_CLKSET;
  64         int pclkdiv = PCLKDIV(clkset);
  65         unsigned int pclk;
  66         if (pclkdiv == 0x3)
  67                 pclkdiv = 0x2;
  68         pclk = hclkfreq_get () / (1 << pclkdiv);
  69
  70         return pclk;
  71 }
  72
  73 /* ----- */
  74
  75 struct clk *clk_get (struct device *dev, const char *id)
  76 {
  77         return dev && strcmp(dev_name(dev), "cldc-lh7a40x") == 0
  78                  ? NULL : ERR_PTR(-ENOENT);
  79 }
  80 EXPORT_SYMBOL(clk_get);
  81
  82 void clk_put (struct clk *clk)
  83 {
  84 }
  85 EXPORT_SYMBOL(clk_put);
  86
  87 int clk_enable (struct clk *clk)
  88 {
  89         return 0;
  90 }
  91 EXPORT_SYMBOL(clk_enable);
  92
  93 void clk_disable (struct clk *clk)
  94 {
  95 }
  96 EXPORT_SYMBOL(clk_disable);
  97
  98 unsigned long clk_get_rate (struct clk *clk)
  99 {
 100         return 0;
 101 }
 102 EXPORT_SYMBOL(clk_get_rate);
 103
 104 long clk_round_rate (struct clk *clk, unsigned long rate)
 105 {
 106         return rate;
 107 }
 108 EXPORT_SYMBOL(clk_round_rate);
 109
 110 int clk_set_rate (struct clk *clk, unsigned long rate)
 111 {
 112         return -EIO;
 113 }
 114 EXPORT_SYMBOL(clk_set_rate);