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/pxa-regs.h>
26
27#include "generic.h"
28
29/*
30 * Various clock factors driven by the CCCR register.
31 */
32
33/* Crystal Frequency to Memory Frequency Multiplier (L) */
34static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
35
36/* Memory Frequency to Run Mode Frequency Multiplier (M) */
37static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
38
39/* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
40/* Note: we store the value N * 2 here. */
41static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
42
43/* Crystal clock */
44#define BASE_CLK	3686400
45
46/*
47 * Get the clock frequency as reflected by CCCR and the turbo flag.
48 * We assume these values have been applied via a fcs.
49 * If info is not 0 we also display the current settings.
50 */
51unsigned int get_clk_frequency_khz(int info)
52{
53	unsigned long cccr, turbo;
54	unsigned int l, L, m, M, n2, N;
55
56	cccr = CCCR;
57	asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
58
59	l  =  L_clk_mult[(cccr >> 0) & 0x1f];
60	m  =  M_clk_mult[(cccr >> 5) & 0x03];
61	n2 = N2_clk_mult[(cccr >> 7) & 0x07];
62
63	L = l * BASE_CLK;
64	M = m * L;
65	N = n2 * M / 2;
66
67	if(info)
68	{
69		L += 5000;
70		printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
71			L / 1000000, (L % 1000000) / 10000, l );
72		M += 5000;
73		printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
74			M / 1000000, (M % 1000000) / 10000, m );
75		N += 5000;
76		printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
77			N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
78			(turbo & 1) ? "" : "in" );
79	}
80
81	return (turbo & 1) ? (N/1000) : (M/1000);
82}
83
84EXPORT_SYMBOL(get_clk_frequency_khz);
85
86/*
87 * Return the current memory clock frequency in units of 10kHz
88 */
89unsigned int get_memclk_frequency_10khz(void)
90{
91	return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
92}
93
94EXPORT_SYMBOL(get_memclk_frequency_10khz);
95
96/*
97 * Return the current LCD clock frequency in units of 10kHz
98 */
99unsigned int get_lcdclk_frequency_10khz(void)
100{
101	return get_memclk_frequency_10khz();
102}
103
104EXPORT_SYMBOL(get_lcdclk_frequency_10khz);
105
106#ifdef CONFIG_PM
107
108int pxa_cpu_pm_prepare(suspend_state_t state)
109{
110	switch (state) {
111	case PM_SUSPEND_MEM:
112		break;
113	default:
114		return -EINVAL;
115	}
116
117	return 0;
118}
119
120void pxa_cpu_pm_enter(suspend_state_t state)
121{
122	extern void pxa_cpu_suspend(unsigned int);
123	extern void pxa_cpu_resume(void);
124
125	CKEN = 0;
126
127	switch (state) {
128	case PM_SUSPEND_MEM:
129		/* set resume return address */
130		PSPR = virt_to_phys(pxa_cpu_resume);
131		pxa_cpu_suspend(PWRMODE_SLEEP);
132		break;
133	}
134}
135
136#endif
137