Commit | Line | Data |
---|---|---|
1da177e4 LT |
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) */ | |
34 | static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, }; | |
35 | ||
36 | /* Memory Frequency to Run Mode Frequency Multiplier (M) */ | |
37 | static 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. */ | |
41 | static 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 | */ | |
51 | unsigned 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 | ||
84 | EXPORT_SYMBOL(get_clk_frequency_khz); | |
85 | ||
86 | /* | |
87 | * Return the current memory clock frequency in units of 10kHz | |
88 | */ | |
89 | unsigned int get_memclk_frequency_10khz(void) | |
90 | { | |
91 | return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000; | |
92 | } | |
93 | ||
94 | EXPORT_SYMBOL(get_memclk_frequency_10khz); | |
95 | ||
96 | /* | |
97 | * Return the current LCD clock frequency in units of 10kHz | |
98 | */ | |
99 | unsigned int get_lcdclk_frequency_10khz(void) | |
100 | { | |
101 | return get_memclk_frequency_10khz(); | |
102 | } | |
103 | ||
104 | EXPORT_SYMBOL(get_lcdclk_frequency_10khz); | |
8775420d TP |
105 | |
106 | ||
107 | int pxa_cpu_pm_prepare(suspend_state_t state) | |
108 | { | |
109 | switch (state) { | |
110 | case PM_SUSPEND_MEM: | |
111 | break; | |
112 | default: | |
113 | return -EINVAL; | |
114 | } | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | void pxa_cpu_pm_enter(suspend_state_t state) | |
120 | { | |
121 | extern void pxa_cpu_suspend(unsigned int); | |
122 | extern void pxa_cpu_resume(void); | |
123 | ||
124 | CKEN = 0; | |
125 | ||
126 | switch (state) { | |
127 | case PM_SUSPEND_MEM: | |
128 | /* set resume return address */ | |
129 | PSPR = virt_to_phys(pxa_cpu_resume); | |
130 | pxa_cpu_suspend(3); | |
131 | break; | |
132 | } | |
133 | } |