arch/arm/mach-pxa/pxa25x.c

   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);