1 /* 2 * linux/arch/arm/mach-pxa/pxa25x.c 3 * 4 * Author: Nicolas Pitre 5 * Created: Jun 15, 2001 6 * Copyright: MontaVista Software Inc. 7 * 8 * Code specific to PXA21x/25x/26x variants. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 * 14 * Since this file should be linked before any other machine specific file, 15 * the __initcall() here will be executed first. This serves as default 16 * initialization stuff for PXA machines which can be overridden later if 17 * need be. 18 */ 19 #include <linux/config.h> 20 #include <linux/module.h> 21 #include <linux/kernel.h> 22 #include <linux/init.h> 23 #include <linux/pm.h> 24 25 #include <asm/hardware.h> 26 #include <asm/arch/pxa-regs.h> 27 28 #include "generic.h" 29 30 /* 31 * Various clock factors driven by the CCCR register. 32 */ 33 34 /* Crystal Frequency to Memory Frequency Multiplier (L) */ 35 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, }; 36 37 /* Memory Frequency to Run Mode Frequency Multiplier (M) */ 38 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 }; 39 40 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */ 41 /* Note: we store the value N * 2 here. */ 42 static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 }; 43 44 /* Crystal clock */ 45 #define BASE_CLK 3686400 46 47 /* 48 * Get the clock frequency as reflected by CCCR and the turbo flag. 49 * We assume these values have been applied via a fcs. 50 * If info is not 0 we also display the current settings. 51 */ 52 unsigned int get_clk_frequency_khz(int info) 53 { 54 unsigned long cccr, turbo; 55 unsigned int l, L, m, M, n2, N; 56 57 cccr = CCCR; 58 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) ); 59 60 l = L_clk_mult[(cccr >> 0) & 0x1f]; 61 m = M_clk_mult[(cccr >> 5) & 0x03]; 62 n2 = N2_clk_mult[(cccr >> 7) & 0x07]; 63 64 L = l * BASE_CLK; 65 M = m * L; 66 N = n2 * M / 2; 67 68 if(info) 69 { 70 L += 5000; 71 printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n", 72 L / 1000000, (L % 1000000) / 10000, l ); 73 M += 5000; 74 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n", 75 M / 1000000, (M % 1000000) / 10000, m ); 76 N += 5000; 77 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n", 78 N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5, 79 (turbo & 1) ? "" : "in" ); 80 } 81 82 return (turbo & 1) ? (N/1000) : (M/1000); 83 } 84 85 EXPORT_SYMBOL(get_clk_frequency_khz); 86 87 /* 88 * Return the current memory clock frequency in units of 10kHz 89 */ 90 unsigned int get_memclk_frequency_10khz(void) 91 { 92 return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000; 93 } 94 95 EXPORT_SYMBOL(get_memclk_frequency_10khz); 96 97 /* 98 * Return the current LCD clock frequency in units of 10kHz 99 */ 100 unsigned int get_lcdclk_frequency_10khz(void) 101 { 102 return get_memclk_frequency_10khz(); 103 } 104 105 EXPORT_SYMBOL(get_lcdclk_frequency_10khz); 106 107 #ifdef CONFIG_PM 108 109 int pxa_cpu_pm_prepare(suspend_state_t state) 110 { 111 switch (state) { 112 case PM_SUSPEND_MEM: 113 break; 114 default: 115 return -EINVAL; 116 } 117 118 return 0; 119 } 120 121 void pxa_cpu_pm_enter(suspend_state_t state) 122 { 123 extern void pxa_cpu_suspend(unsigned int); 124 extern void pxa_cpu_resume(void); 125 126 CKEN = 0; 127 128 switch (state) { 129 case PM_SUSPEND_MEM: 130 /* set resume return address */ 131 PSPR = virt_to_phys(pxa_cpu_resume); 132 pxa_cpu_suspend(PWRMODE_SLEEP); 133 break; 134 } 135 } 136 137 #endif 138