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>
22 #include <linux/platform_device.h>
25 #include <asm/hardware.h>
26 #include <asm/arch/irqs.h>
27 #include <asm/arch/pxa-regs.h>
28 #include <asm/arch/pm.h>
29 #include <asm/arch/dma.h>
35 * Various clock factors driven by the CCCR register.
38 /* Crystal Frequency to Memory Frequency Multiplier (L) */
39 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
41 /* Memory Frequency to Run Mode Frequency Multiplier (M) */
42 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
44 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
45 /* Note: we store the value N * 2 here. */
46 static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
49 #define BASE_CLK 3686400
52 * Get the clock frequency as reflected by CCCR and the turbo flag.
53 * We assume these values have been applied via a fcs.
54 * If info is not 0 we also display the current settings.
56 unsigned int get_clk_frequency_khz(int info)
58 unsigned long cccr, turbo;
59 unsigned int l, L, m, M, n2, N;
62 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
64 l = L_clk_mult[(cccr >> 0) & 0x1f];
65 m = M_clk_mult[(cccr >> 5) & 0x03];
66 n2 = N2_clk_mult[(cccr >> 7) & 0x07];
75 printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
76 L / 1000000, (L % 1000000) / 10000, l );
78 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
79 M / 1000000, (M % 1000000) / 10000, m );
81 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
82 N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
83 (turbo & 1) ? "" : "in" );
86 return (turbo & 1) ? (N/1000) : (M/1000);
89 EXPORT_SYMBOL(get_clk_frequency_khz);
92 * Return the current memory clock frequency in units of 10kHz
94 unsigned int get_memclk_frequency_10khz(void)
96 return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
99 EXPORT_SYMBOL(get_memclk_frequency_10khz);
102 * Return the current LCD clock frequency in units of 10kHz
104 unsigned int get_lcdclk_frequency_10khz(void)
106 return get_memclk_frequency_10khz();
109 EXPORT_SYMBOL(get_lcdclk_frequency_10khz);
113 void pxa_cpu_pm_enter(suspend_state_t state)
115 extern void pxa_cpu_suspend(unsigned int);
116 extern void pxa_cpu_resume(void);
122 /* set resume return address */
123 PSPR = virt_to_phys(pxa_cpu_resume);
124 pxa_cpu_suspend(PWRMODE_SLEEP);
129 static struct pm_ops pxa25x_pm_ops = {
130 .enter = pxa_pm_enter,
131 .valid = pm_valid_only_mem,
135 void __init pxa25x_init_irq(void)
138 pxa_init_irq_gpio(85);
141 static struct platform_device *pxa25x_devices[] __initdata = {
154 static int __init pxa25x_init(void)
158 if (cpu_is_pxa21x() || cpu_is_pxa25x()) {
159 if ((ret = pxa_init_dma(16)))
162 pm_set_ops(&pxa25x_pm_ops);
164 ret = platform_add_devices(pxa25x_devices,
165 ARRAY_SIZE(pxa25x_devices));
167 /* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
169 ret = platform_device_register(&hwuart_device);
174 subsys_initcall(pxa25x_init);