linux/arch/arm/mach-w90x900/clksel.c
wanzongshun 35c9221acb ARM: 5682/1: Add cpu.c and dev.c and modify some files of w90p910 platform
Add the cpu.c and dev.c and modify w90p910 platform
to apply to use the common API(provided by cpu.c and dev.c)
at the same time, I renamed all w90x900 to nuc900 in every
c file of w90x900 platform and touchscreen's driver name.

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-09-02 11:22:23 +01:00

91 lines
1.9 KiB
C

/*
* linux/arch/arm/mach-w90x900/clksel.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;version 2 of the License.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/clk.h>
#include <linux/mutex.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/regs-clock.h>
#define PLL0 0x00
#define PLL1 0x01
#define OTHER 0x02
#define EXT 0x03
#define MSOFFSET 0x0C
#define ATAOFFSET 0x0a
#define LCDOFFSET 0x06
#define AUDOFFSET 0x04
#define CPUOFFSET 0x00
static DEFINE_MUTEX(clksel_sem);
static void clock_source_select(const char *dev_id, unsigned int clkval)
{
unsigned int clksel, offset;
clksel = __raw_readl(REG_CLKSEL);
if (strcmp(dev_id, "nuc900-ms") == 0)
offset = MSOFFSET;
else if (strcmp(dev_id, "nuc900-atapi") == 0)
offset = ATAOFFSET;
else if (strcmp(dev_id, "nuc900-lcd") == 0)
offset = LCDOFFSET;
else if (strcmp(dev_id, "nuc900-audio") == 0)
offset = AUDOFFSET;
else
offset = CPUOFFSET;
clksel &= ~(0x03 << offset);
clksel |= (clkval << offset);
__raw_writel(clksel, REG_CLKSEL);
}
void nuc900_clock_source(struct device *dev, unsigned char *src)
{
unsigned int clkval;
const char *dev_id;
BUG_ON(!src);
clkval = 0;
mutex_lock(&clksel_sem);
if (dev)
dev_id = dev_name(dev);
else
dev_id = "cpufreq";
if (strcmp(src, "pll0") == 0)
clkval = PLL0;
else if (strcmp(src, "pll1") == 0)
clkval = PLL1;
else if (strcmp(src, "ext") == 0)
clkval = EXT;
else if (strcmp(src, "oth") == 0)
clkval = OTHER;
clock_source_select(dev_id, clkval);
mutex_unlock(&clksel_sem);
}
EXPORT_SYMBOL(nuc900_clock_source);