LXR linux/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
  27static DEFINE_SPINLOCK(clocks_lock);
  28
  29int 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}
  40EXPORT_SYMBOL(clk_enable);
  41
  42void 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}
  56EXPORT_SYMBOL(clk_disable);
  57
  58unsigned long clk_get_rate(struct clk *clk)
  59{
  60        return 15000000;
  61}
  62EXPORT_SYMBOL(clk_get_rate);
  63
  64void 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
  79void 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 */
  95long clk_round_rate(struct clk *clk, unsigned long rate)
  96{
  97        WARN_ON(clk);
  98        return 0;
  99}
 100EXPORT_SYMBOL(clk_round_rate);
 101
 102int clk_set_rate(struct clk *clk, unsigned long rate)
 103{
 104        WARN_ON(clk);
 105        return 0;
 106}
 107EXPORT_SYMBOL(clk_set_rate);
 108
 109int clk_set_parent(struct clk *clk, struct clk *parent)
 110{
 111        WARN_ON(clk);
 112        return 0;
 113}
 114EXPORT_SYMBOL(clk_set_parent);
 115
 116struct clk *clk_get_parent(struct clk *clk)
 117{
 118        WARN_ON(clk);
 119        return NULL;
 120}
 121EXPORT_SYMBOL(clk_get_parent);
 122