mirror of
https://github.com/torvalds/linux
synced 2024-10-10 13:24:04 +00:00
b886d83c5b
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 315 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531190115.503150771@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* linux/arch/arm/mach-w90x900/clksel.c
|
|
*
|
|
* Copyright (c) 2008 Nuvoton technology corporation
|
|
*
|
|
* Wan ZongShun <mcuos.com@gmail.com>
|
|
*/
|
|
|
|
#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-ac97") == 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);
|
|
|