2 * linux/arch/arm/mach-pxa/pxa25x.c
4 * Author: Nicolas Pitre
5 * Created: Jun 15, 2001
6 * Copyright: MontaVista Software Inc.
8 * Code specific to PXA21x/25x/26x variants.
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.
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
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/init.h>
24 #include <asm/hardware.h>
25 #include <asm/arch/irqs.h>
26 #include <asm/arch/pxa-regs.h>
27 #include <asm/arch/pm.h>
32 * Various clock factors driven by the CCCR register.
35 /* Crystal Frequency to Memory Frequency Multiplier (L) */
36 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
38 /* Memory Frequency to Run Mode Frequency Multiplier (M) */
39 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
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 };
46 #define BASE_CLK 3686400
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.
53 unsigned int get_clk_frequency_khz(int info)
55 unsigned long cccr, turbo;
56 unsigned int l, L, m, M, n2, N;
59 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
61 l = L_clk_mult[(cccr >> 0) & 0x1f];
62 m = M_clk_mult[(cccr >> 5) & 0x03];
63 n2 = N2_clk_mult[(cccr >> 7) & 0x07];
72 printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
73 L / 1000000, (L % 1000000) / 10000, l );
75 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
76 M / 1000000, (M % 1000000) / 10000, m );
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" );
83 return (turbo & 1) ? (N/1000) : (M/1000);
86 EXPORT_SYMBOL(get_clk_frequency_khz);
89 * Return the current memory clock frequency in units of 10kHz
91 unsigned int get_memclk_frequency_10khz(void)
93 return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
96 EXPORT_SYMBOL(get_memclk_frequency_10khz);
99 * Return the current LCD clock frequency in units of 10kHz
101 unsigned int get_lcdclk_frequency_10khz(void)
103 return get_memclk_frequency_10khz();
106 EXPORT_SYMBOL(get_lcdclk_frequency_10khz);
110 void pxa_cpu_pm_enter(suspend_state_t state)
112 extern void pxa_cpu_suspend(unsigned int);
113 extern void pxa_cpu_resume(void);
119 /* set resume return address */
120 PSPR = virt_to_phys(pxa_cpu_resume);
121 pxa_cpu_suspend(PWRMODE_SLEEP);
126 static struct pm_ops pxa25x_pm_ops = {
127 .enter = pxa_pm_enter,
128 .valid = pm_valid_only_mem,
132 void __init pxa25x_init_irq(void)
135 pxa_init_irq_gpio(85);
138 static int __init pxa25x_init(void)
140 if (cpu_is_pxa21x() || cpu_is_pxa25x()) {
142 pm_set_ops(&pxa25x_pm_ops);
148 subsys_initcall(pxa25x_init);