arch/arm/mach-w90x900/clock.c

   1 /*
   2  * linux/arch/arm/mach-w90x900/clock.c
   3  *
   4  * Copyright (c) 2008 Nuvoton technology corporation
   5  *
   6  * Wan ZongShun <mcuos.com@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/list.h>
  16 #include <linux/errno.h>
  17 #include <linux/err.h>
  18 #include <linux/string.h>
  19 #include <linux/clk.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/io.h>
  23
  24 #include <mach/hardware.h>
  25
  26 #include "clock.h"
  27
  28 #define SUBCLK 0x24
  29
  30 static DEFINE_SPINLOCK(clocks_lock);
  31
  32 int clk_enable(struct clk *clk)
  33 {
  34         unsigned long flags;
  35
  36         spin_lock_irqsave(&clocks_lock, flags);
  37         if (clk->enabled++ == 0)
  38                 (clk->enable)(clk, 1);
  39         spin_unlock_irqrestore(&clocks_lock, flags);
  40
  41         return 0;
  42 }
  43 EXPORT_SYMBOL(clk_enable);
  44
  45 void clk_disable(struct clk *clk)
  46 {
  47         unsigned long flags;
  48
  49         WARN_ON(clk->enabled == 0);
  50
  51         spin_lock_irqsave(&clocks_lock, flags);
  52         if (--clk->enabled == 0)
  53                 (clk->enable)(clk, 0);
  54         spin_unlock_irqrestore(&clocks_lock, flags);
  55 }
  56 EXPORT_SYMBOL(clk_disable);
  57
  58 unsigned long clk_get_rate(struct clk *clk)
  59 {
  60         return 15000000;
  61 }
  62 EXPORT_SYMBOL(clk_get_rate);
  63
  64 void nuc900_clk_enable(struct clk *clk, int enable)
  65 {
  66         unsigned int clocks = clk->cken;
  67         unsigned long clken;
  68
  69         clken = __raw_readl(W90X900_VA_CLKPWR);
  70
  71         if (enable)
  72                 clken |= clocks;
  73         else
  74                 clken &= ~clocks;
  75
  76         __raw_writel(clken, W90X900_VA_CLKPWR);
  77 }
  78
  79 void nuc900_subclk_enable(struct clk *clk, int enable)
  80 {
  81         unsigned int clocks = clk->cken;
  82         unsigned long clken;
  83
  84         clken = __raw_readl(W90X900_VA_CLKPWR + SUBCLK);
  85
  86         if (enable)
  87                 clken |= clocks;
  88         else
  89                 clken &= ~clocks;
  90
  91         __raw_writel(clken, W90X900_VA_CLKPWR + SUBCLK);
  92 }
  93
  94
  95 void clks_register(struct clk_lookup *clks, size_t num)
  96 {
  97         int i;
  98
  99         for (i = 0; i < num; i++)
 100                 clkdev_add(&clks[i]);
 101 }