bd7fefe1f0
w90x900 still provides its own variant of the clk API rather than using the generic COMMON_CLK API. This generally works, but it causes some link errors with drivers using the clk_set_rate, clk_get_parent, clk_set_parent or clk_round_rate functions when a platform lacks those interfaces. This adds empty stub implementations for each of them, and I don't even try to do something useful here but instead just print a WARN() message to make it obvious what is going on if they ever end up being called. The drivers that call these won't be used on these platforms (otherwise we'd get a link error today), so the added code is harmless bloat and will warn about accidental use. A while ago there was a proposal to change w90x900 to use the common-clk implementation, which would be the way it should be handled properly. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
125 lines
2.3 KiB
C
125 lines
2.3 KiB
C
/*
|
|
* linux/arch/arm/mach-w90x900/clock.c
|
|
*
|
|
* Copyright (c) 2008 Nuvoton technology corporation
|
|
*
|
|
* Wan ZongShun <mcuos.com@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/err.h>
|
|
#include <linux/string.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <mach/hardware.h>
|
|
|
|
#include "clock.h"
|
|
|
|
#define SUBCLK 0x24
|
|
|
|
static DEFINE_SPINLOCK(clocks_lock);
|
|
|
|
int clk_enable(struct clk *clk)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&clocks_lock, flags);
|
|
if (clk->enabled++ == 0)
|
|
(clk->enable)(clk, 1);
|
|
spin_unlock_irqrestore(&clocks_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(clk_enable);
|
|
|
|
void clk_disable(struct clk *clk)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (!clk)
|
|
return;
|
|
|
|
WARN_ON(clk->enabled == 0);
|
|
|
|
spin_lock_irqsave(&clocks_lock, flags);
|
|
if (--clk->enabled == 0)
|
|
(clk->enable)(clk, 0);
|
|
spin_unlock_irqrestore(&clocks_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(clk_disable);
|
|
|
|
unsigned long clk_get_rate(struct clk *clk)
|
|
{
|
|
return 15000000;
|
|
}
|
|
EXPORT_SYMBOL(clk_get_rate);
|
|
|
|
void nuc900_clk_enable(struct clk *clk, int enable)
|
|
{
|
|
unsigned int clocks = clk->cken;
|
|
unsigned long clken;
|
|
|
|
clken = __raw_readl(W90X900_VA_CLKPWR);
|
|
|
|
if (enable)
|
|
clken |= clocks;
|
|
else
|
|
clken &= ~clocks;
|
|
|
|
__raw_writel(clken, W90X900_VA_CLKPWR);
|
|
}
|
|
|
|
void nuc900_subclk_enable(struct clk *clk, int enable)
|
|
{
|
|
unsigned int clocks = clk->cken;
|
|
unsigned long clken;
|
|
|
|
clken = __raw_readl(W90X900_VA_CLKPWR + SUBCLK);
|
|
|
|
if (enable)
|
|
clken |= clocks;
|
|
else
|
|
clken &= ~clocks;
|
|
|
|
__raw_writel(clken, W90X900_VA_CLKPWR + SUBCLK);
|
|
}
|
|
|
|
/* dummy functions, should not be called */
|
|
long clk_round_rate(struct clk *clk, unsigned long rate)
|
|
{
|
|
WARN_ON(clk);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(clk_round_rate);
|
|
|
|
int clk_set_rate(struct clk *clk, unsigned long rate)
|
|
{
|
|
WARN_ON(clk);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(clk_set_rate);
|
|
|
|
int clk_set_parent(struct clk *clk, struct clk *parent)
|
|
{
|
|
WARN_ON(clk);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(clk_set_parent);
|
|
|
|
struct clk *clk_get_parent(struct clk *clk)
|
|
{
|
|
WARN_ON(clk);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(clk_get_parent);
|