92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
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/*
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* linux/arch/arm/mach-w90x900/clksel.c
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*
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* Copyright (c) 2008 Nuvoton technology corporation
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*
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* Wan ZongShun <mcuos.com@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation;version 2 of the License.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <linux/clk.h>
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#include <linux/mutex.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <mach/regs-clock.h>
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#define PLL0 0x00
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#define PLL1 0x01
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#define OTHER 0x02
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#define EXT 0x03
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#define MSOFFSET 0x0C
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#define ATAOFFSET 0x0a
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#define LCDOFFSET 0x06
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#define AUDOFFSET 0x04
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#define CPUOFFSET 0x00
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static DEFINE_MUTEX(clksel_sem);
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static void clock_source_select(const char *dev_id, unsigned int clkval)
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{
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unsigned int clksel, offset;
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clksel = __raw_readl(REG_CLKSEL);
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if (strcmp(dev_id, "nuc900-ms") == 0)
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offset = MSOFFSET;
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else if (strcmp(dev_id, "nuc900-atapi") == 0)
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offset = ATAOFFSET;
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else if (strcmp(dev_id, "nuc900-lcd") == 0)
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offset = LCDOFFSET;
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else if (strcmp(dev_id, "nuc900-audio") == 0)
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offset = AUDOFFSET;
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else
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offset = CPUOFFSET;
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clksel &= ~(0x03 << offset);
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clksel |= (clkval << offset);
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__raw_writel(clksel, REG_CLKSEL);
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}
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void nuc900_clock_source(struct device *dev, unsigned char *src)
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{
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unsigned int clkval;
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const char *dev_id;
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BUG_ON(!src);
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clkval = 0;
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mutex_lock(&clksel_sem);
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if (dev)
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dev_id = dev_name(dev);
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else
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dev_id = "cpufreq";
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if (strcmp(src, "pll0") == 0)
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clkval = PLL0;
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else if (strcmp(src, "pll1") == 0)
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clkval = PLL1;
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else if (strcmp(src, "ext") == 0)
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clkval = EXT;
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else if (strcmp(src, "oth") == 0)
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clkval = OTHER;
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clock_source_select(dev_id, clkval);
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mutex_unlock(&clksel_sem);
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}
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EXPORT_SYMBOL(nuc900_clock_source);
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