1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/*
* linux/arch/arm/mach-pxa/pxa25x.c
*
* Author: Nicolas Pitre
* Created: Jun 15, 2001
* Copyright: MontaVista Software Inc.
*
* Code specific to PXA21x/25x/26x variants.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Since this file should be linked before any other machine specific file,
* the __initcall() here will be executed first. This serves as default
* initialization stuff for PXA machines which can be overridden later if
* need be.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <asm/hardware.h>
#include <asm/arch/pxa-regs.h>
#include "generic.h"
/*
* Various clock factors driven by the CCCR register.
*/
/* Crystal Frequency to Memory Frequency Multiplier (L) */
static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
/* Memory Frequency to Run Mode Frequency Multiplier (M) */
static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
/* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
/* Note: we store the value N * 2 here. */
static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
/* Crystal clock */
#define BASE_CLK 3686400
/*
* Get the clock frequency as reflected by CCCR and the turbo flag.
* We assume these values have been applied via a fcs.
* If info is not 0 we also display the current settings.
*/
unsigned int get_clk_frequency_khz(int info)
{
unsigned long cccr, turbo;
unsigned int l, L, m, M, n2, N;
cccr = CCCR;
asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
l = L_clk_mult[(cccr >> 0) & 0x1f];
m = M_clk_mult[(cccr >> 5) & 0x03];
n2 = N2_clk_mult[(cccr >> 7) & 0x07];
L = l * BASE_CLK;
M = m * L;
N = n2 * M / 2;
if(info)
{
L += 5000;
printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
L / 1000000, (L % 1000000) / 10000, l );
M += 5000;
printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
M / 1000000, (M % 1000000) / 10000, m );
N += 5000;
printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
(turbo & 1) ? "" : "in" );
}
return (turbo & 1) ? (N/1000) : (M/1000);
}
EXPORT_SYMBOL(get_clk_frequency_khz);
/*
* Return the current memory clock frequency in units of 10kHz
*/
unsigned int get_memclk_frequency_10khz(void)
{
return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
}
EXPORT_SYMBOL(get_memclk_frequency_10khz);
/*
* Return the current LCD clock frequency in units of 10kHz
*/
unsigned int get_lcdclk_frequency_10khz(void)
{
return get_memclk_frequency_10khz();
}
EXPORT_SYMBOL(get_lcdclk_frequency_10khz);
#ifdef CONFIG_PM
int pxa_cpu_pm_prepare(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_MEM:
break;
default:
return -EINVAL;
}
return 0;
}
void pxa_cpu_pm_enter(suspend_state_t state)
{
extern void pxa_cpu_suspend(unsigned int);
extern void pxa_cpu_resume(void);
CKEN = 0;
switch (state) {
case PM_SUSPEND_MEM:
/* set resume return address */
PSPR = virt_to_phys(pxa_cpu_resume);
pxa_cpu_suspend(3);
break;
}
}
#endif
|
