arch/arm/mach-w90x900/clock.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/arch/arm/mach-w90x900/clock.c
   4  *
   5  * Copyright (c) 2008 Nuvoton technology corporation
   6  *
   7  * Wan ZongShun <mcuos.com@gmail.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/list.h>
  13 #include <linux/errno.h>
  14 #include <linux/err.h>
  15 #include <linux/string.h>
  16 #include <linux/clk.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/io.h>
  20
  21 #include <mach/hardware.h>
  22
  23 #include "clock.h"
  24
  25 #define SUBCLK 0x24
  26
  27 static DEFINE_SPINLOCK(clocks_lock);
  28
  29 int clk_enable(struct clk *clk)
  30 {
  31         unsigned long flags;
  32
  33         spin_lock_irqsave(&clocks_lock, flags);
  34         if (clk->enabled++ == 0)
  35                 (clk->enable)(clk, 1);
  36         spin_unlock_irqrestore(&clocks_lock, flags);
  37
  38         return 0;
  39 }
  40 EXPORT_SYMBOL(clk_enable);
  41
  42 void clk_disable(struct clk *clk)
  43 {
  44         unsigned long flags;
  45
  46         if (!clk)
  47                 return;
  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 /* dummy functions, should not be called */
  95 long clk_round_rate(struct clk *clk, unsigned long rate)
  96 {
  97         WARN_ON(clk);
  98         return 0;
  99 }
 100 EXPORT_SYMBOL(clk_round_rate);
 101
 102 int clk_set_rate(struct clk *clk, unsigned long rate)
 103 {
 104         WARN_ON(clk);
 105         return 0;
 106 }
 107 EXPORT_SYMBOL(clk_set_rate);
 108
 109 int clk_set_parent(struct clk *clk, struct clk *parent)
 110 {
 111         WARN_ON(clk);
 112         return 0;
 113 }
 114 EXPORT_SYMBOL(clk_set_parent);
 115
 116 struct clk *clk_get_parent(struct clk *clk)
 117 {
 118         WARN_ON(clk);
 119         return NULL;
 120 }
 121 EXPORT_SYMBOL(clk_get_parent);