/* *  linux/arch/arm/mach-pxa/pxa25x.c * *  Author:	Nicolas Pitre *  Created:	Jun 15, 2001 *  Copyright:	MontaVista Software Inc. * * Code specific to PXA21x/25x/26x variants. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Since this file should be linked before any other machine specific file, * the __initcall() here will be executed first.  This serves as default * initialization stuff for PXA machines which can be overridden later if * need be. */#include <linux/module.h>#include <linux/kernel.h>#include <linux/init.h>#include <linux/pm.h>#include <asm/hardware.h>#include <asm/arch/pxa-regs.h>#include "generic.h"/* * Various clock factors driven by the CCCR register. *//* Crystal Frequency to Memory Frequency Multiplier (L) */static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };/* Memory Frequency to Run Mode Frequency Multiplier (M) */static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };/* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) *//* Note: we store the value N * 2 here. */static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };/* Crystal clock */#define BASE_CLK	3686400/* * Get the clock frequency as reflected by CCCR and the turbo flag. * We assume these values have been applied via a fcs. * If info is not 0 we also display the current settings. */unsigned int get_clk_frequency_khz(int info){	unsigned long cccr, turbo;	unsigned int l, L, m, M, n2, N;	cccr = CCCR;	asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );	l  =  L_clk_mult[(cccr >> 0) & 0x1f];	m  =  M_clk_mult[(cccr >> 5) & 0x03];	n2 = N2_clk_mult[(cccr >> 7) & 0x07];	L = l * BASE_CLK;	M = m * L;	N = n2 * M / 2;	if(info)	{		L += 5000;		printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",			L / 1000000, (L % 1000000) / 10000, l );		M += 5000;		printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",			M / 1000000, (M % 1000000) / 10000, m );		N += 5000;		printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",			N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,			(turbo & 1) ? "" : "in" );	}	return (turbo & 1) ? (N/1000) : (M/1000);}EXPORT_SYMBOL(get_clk_frequency_khz);/* * Return the current memory clock frequency in units of 10kHz */unsigned int get_memclk_frequency_10khz(void){	return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;}EXPORT_SYMBOL(get_memclk_frequency_10khz);/* * Return the current LCD clock frequency in units of 10kHz */unsigned int get_lcdclk_frequency_10khz(void){	return get_memclk_frequency_10khz();}EXPORT_SYMBOL(get_lcdclk_frequency_10khz);