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/module.h> 20 #include <linux/kernel.h> 21 #include <linux/init.h> 22 #include <linux/pm.h> 23 24 #include <asm/hardware.h> 25 #include <asm/arch/irqs.h> 26 #include <asm/arch/pxa-regs.h> 27 #include <asm/arch/pm.h> 28 29 #include "generic.h" 30 31 /* 32 * Various clock factors driven by the CCCR register. 33 */ 34 35 /* Crystal Frequency to Memory Frequency Multiplier (L) */ 36 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, }; 37 38 /* Memory Frequency to Run Mode Frequency Multiplier (M) */ 39 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 }; 40 41 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */ 42 /* Note: we store the value N * 2 here. */ 43 static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 }; 44 45 /* Crystal clock */ 46 #define BASE_CLK 3686400 47 48 /* 49 * Get the clock frequency as reflected by CCCR and the turbo flag. 50 * We assume these values have been applied via a fcs. 51 * If info is not 0 we also display the current settings. 52 */ 53 unsigned int get_clk_frequency_khz(int info) 54 { 55 unsigned long cccr, turbo; 56 unsigned int l, L, m, M, n2, N; 57 58 cccr = CCCR; 59 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) ); 60 61 l = L_clk_mult[(cccr >> 0) & 0x1f]; 62 m = M_clk_mult[(cccr >> 5) & 0x03]; 63 n2 = N2_clk_mult[(cccr >> 7) & 0x07]; 64 65 L = l * BASE_CLK; 66 M = m * L; 67 N = n2 * M / 2; 68 69 if(info) 70 { 71 L += 5000; 72 printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n", 73 L / 1000000, (L % 1000000) / 10000, l ); 74 M += 5000; 75 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n", 76 M / 1000000, (M % 1000000) / 10000, m ); 77 N += 5000; 78 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n", 79 N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5, 80 (turbo & 1) ? "" : "in" ); 81 } 82 83 return (turbo & 1) ? (N/1000) : (M/1000); 84 } 85 86 EXPORT_SYMBOL(get_clk_frequency_khz); 87 88 /* 89 * Return the current memory clock frequency in units of 10kHz 90 */ 91 unsigned int get_memclk_frequency_10khz(void) 92 { 93 return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000; 94 } 95 96 EXPORT_SYMBOL(get_memclk_frequency_10khz); 97 98 /* 99 * Return the current LCD clock frequency in units of 10kHz 100 */ 101 unsigned int get_lcdclk_frequency_10khz(void) 102 { 103 return get_memclk_frequency_10khz(); 104 } 105 106 EXPORT_SYMBOL(get_lcdclk_frequency_10khz); 107 108 #ifdef CONFIG_PM 109 110 void pxa_cpu_pm_enter(suspend_state_t state) 111 { 112 extern void pxa_cpu_suspend(unsigned int); 113 extern void pxa_cpu_resume(void); 114 115 CKEN = 0; 116 117 switch (state) { 118 case PM_SUSPEND_MEM: 119 /* set resume return address */ 120 PSPR = virt_to_phys(pxa_cpu_resume); 121 pxa_cpu_suspend(PWRMODE_SLEEP); 122 break; 123 } 124 } 125 126 static struct pm_ops pxa25x_pm_ops = { 127 .enter = pxa_pm_enter, 128 .valid = pm_valid_only_mem, 129 }; 130 #endif 131 132 void __init pxa25x_init_irq(void) 133 { 134 pxa_init_irq_low(); 135 pxa_init_irq_gpio(85); 136 } 137 138 static int __init pxa25x_init(void) 139 { 140 if (cpu_is_pxa21x() || cpu_is_pxa25x()) { 141 #ifdef CONFIG_PM 142 pm_set_ops(&pxa25x_pm_ops); 143 #endif 144 } 145 return 0; 146 } 147 148 subsys_initcall(pxa25x_init); 149