2 * linux/arch/arm/mach-pxa/pxa27x.c
4 * Author: Nicolas Pitre
5 * Created: Nov 05, 2002
6 * Copyright: MontaVista Software Inc.
8 * Code specific to PXA27x aka Bulverde.
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 #include <linux/config.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
20 #include <asm/hardware.h>
24 /* Crystal clock: 13MHz */
25 #define BASE_CLK 13000000
28 * Get the clock frequency as reflected by CCSR and the turbo flag.
29 * We assume these values have been applied via a fcs.
30 * If info is not 0 we also display the current settings.
32 unsigned int get_clk_frequency_khz( int info)
34 unsigned long ccsr, clkcfg;
35 unsigned int l, L, m, M, n2, N, S;
39 cccr_a = CCCR & (1 << 25);
41 /* Read clkcfg register: it has turbo, b, half-turbo (and f) */
42 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
43 t = clkcfg & (1 << 1);
44 ht = clkcfg & (1 << 2);
45 b = clkcfg & (1 << 3);
49 m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
53 M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
57 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
58 L / 1000000, (L % 1000000) / 10000, l );
59 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
60 N / 1000000, (N % 1000000)/10000, n2 / 2, (n2 % 2)*5,
62 printk( KERN_INFO "Memory clock: %d.%02dMHz (/%d)\n",
63 M / 1000000, (M % 1000000) / 10000, m );
64 printk( KERN_INFO "System bus clock: %d.%02dMHz \n",
65 S / 1000000, (S % 1000000) / 10000 );
68 return (t) ? (N/1000) : (L/1000);
72 * Return the current mem clock frequency in units of 10kHz as
73 * reflected by CCCR[A], B, and L
75 unsigned int get_memclk_frequency_10khz(void)
77 unsigned long ccsr, clkcfg;
78 unsigned int l, L, m, M;
82 cccr_a = CCCR & (1 << 25);
84 /* Read clkcfg register: it has turbo, b, half-turbo (and f) */
85 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
86 b = clkcfg & (1 << 3);
89 m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
92 M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
98 * Return the current LCD clock frequency in units of 10kHz as
100 unsigned int get_lcdclk_frequency_10khz(void)
103 unsigned int l, L, k, K;
108 k = (l <= 7) ? 1 : (l <= 16) ? 2 : 4;
116 EXPORT_SYMBOL(get_clk_frequency_khz);
117 EXPORT_SYMBOL(get_memclk_frequency_10khz);
118 EXPORT_SYMBOL(get_lcdclk_frequency_10khz);