/* * 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/config.h> #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); #ifdef CONFIG_PM int pxa_cpu_pm_prepare(suspend_state_t state) { switch (state) { case PM_SUSPEND_MEM: break; default: return -EINVAL; } return 0; } void pxa_cpu_pm_enter(suspend_state_t state) { extern void pxa_cpu_suspend(unsigned int); extern void pxa_cpu_resume(void); CKEN = 0; switch (state) { case PM_SUSPEND_MEM: /* set resume return address */ PSPR = virt_to_phys(pxa_cpu_resume); pxa_cpu_suspend(PWRMODE_SLEEP); break; } } #endif