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 <asm/arch/pxa-regs.h>
18 #include <linux/init.h>
21 #include <asm/hardware.h>
25 /* Crystal clock: 13MHz */
26 #define BASE_CLK 13000000
29 * Get the clock frequency as reflected by CCSR and the turbo flag.
30 * We assume these values have been applied via a fcs.
31 * If info is not 0 we also display the current settings.
33 unsigned int get_clk_frequency_khz( int info)
35 unsigned long ccsr, clkcfg;
36 unsigned int l, L, m, M, n2, N, S;
40 cccr_a = CCCR & (1 << 25);
42 /* Read clkcfg register: it has turbo, b, half-turbo (and f) */
43 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
44 t = clkcfg & (1 << 1);
45 ht = clkcfg & (1 << 2);
46 b = clkcfg & (1 << 3);
50 m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
54 M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
58 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
59 L / 1000000, (L % 1000000) / 10000, l );
60 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
61 N / 1000000, (N % 1000000)/10000, n2 / 2, (n2 % 2)*5,
63 printk( KERN_INFO "Memory clock: %d.%02dMHz (/%d)\n",
64 M / 1000000, (M % 1000000) / 10000, m );
65 printk( KERN_INFO "System bus clock: %d.%02dMHz \n",
66 S / 1000000, (S % 1000000) / 10000 );
69 return (t) ? (N/1000) : (L/1000);
73 * Return the current mem clock frequency in units of 10kHz as
74 * reflected by CCCR[A], B, and L
76 unsigned int get_memclk_frequency_10khz(void)
78 unsigned long ccsr, clkcfg;
79 unsigned int l, L, m, M;
83 cccr_a = CCCR & (1 << 25);
85 /* Read clkcfg register: it has turbo, b, half-turbo (and f) */
86 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
87 b = clkcfg & (1 << 3);
90 m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
93 M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
99 * Return the current LCD clock frequency in units of 10kHz as
101 unsigned int get_lcdclk_frequency_10khz(void)
104 unsigned int l, L, k, K;
109 k = (l <= 7) ? 1 : (l <= 16) ? 2 : 4;
117 EXPORT_SYMBOL(get_clk_frequency_khz);
118 EXPORT_SYMBOL(get_memclk_frequency_10khz);
119 EXPORT_SYMBOL(get_lcdclk_frequency_10khz);