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[linux-2.6] / arch / arm / mach-pxa / generic.c
1 /*
2  *  linux/arch/arm/mach-pxa/generic.c
3  *
4  *  Author:     Nicolas Pitre
5  *  Created:    Jun 15, 2001
6  *  Copyright:  MontaVista Software Inc.
7  *
8  * Code common to all PXA machines.
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
23 #include <asm/hardware.h>
24 #include <asm/system.h>
25 #include <asm/pgtable.h>
26 #include <asm/mach/map.h>
27
28 #include <asm/arch/pxa-regs.h>
29
30 #include "generic.h"
31
32 /*
33  * Get the clock frequency as reflected by CCCR and the turbo flag.
34  * We assume these values have been applied via a fcs.
35  * If info is not 0 we also display the current settings.
36  */
37 unsigned int get_clk_frequency_khz(int info)
38 {
39         if (cpu_is_pxa21x() || cpu_is_pxa25x())
40                 return pxa25x_get_clk_frequency_khz(info);
41         else if (cpu_is_pxa27x())
42                 return pxa27x_get_clk_frequency_khz(info);
43         else
44                 return pxa3xx_get_clk_frequency_khz(info);
45 }
46 EXPORT_SYMBOL(get_clk_frequency_khz);
47
48 /*
49  * Return the current memory clock frequency in units of 10kHz
50  */
51 unsigned int get_memclk_frequency_10khz(void)
52 {
53         if (cpu_is_pxa21x() || cpu_is_pxa25x())
54                 return pxa25x_get_memclk_frequency_10khz();
55         else if (cpu_is_pxa27x())
56                 return pxa27x_get_memclk_frequency_10khz();
57         else
58                 return pxa3xx_get_memclk_frequency_10khz();
59 }
60 EXPORT_SYMBOL(get_memclk_frequency_10khz);
61
62 /*
63  * Routine to safely enable or disable a clock in the CKEN
64  */
65 void __pxa_set_cken(int clock, int enable)
66 {
67         unsigned long flags;
68         local_irq_save(flags);
69
70         if (enable)
71                 CKEN |= (1 << clock);
72         else
73                 CKEN &= ~(1 << clock);
74
75         local_irq_restore(flags);
76 }
77 EXPORT_SYMBOL(__pxa_set_cken);
78
79 /*
80  * Intel PXA2xx internal register mapping.
81  *
82  * Note 1: not all PXA2xx variants implement all those addresses.
83  *
84  * Note 2: virtual 0xfffe0000-0xffffffff is reserved for the vector table
85  *         and cache flush area.
86  */
87 static struct map_desc standard_io_desc[] __initdata = {
88         {       /* Devs */
89                 .virtual        =  0xf2000000,
90                 .pfn            = __phys_to_pfn(0x40000000),
91                 .length         = 0x02000000,
92                 .type           = MT_DEVICE
93         }, {    /* LCD */
94                 .virtual        =  0xf4000000,
95                 .pfn            = __phys_to_pfn(0x44000000),
96                 .length         = 0x00100000,
97                 .type           = MT_DEVICE
98         }, {    /* Mem Ctl */
99                 .virtual        =  0xf6000000,
100                 .pfn            = __phys_to_pfn(0x48000000),
101                 .length         = 0x00200000,
102                 .type           = MT_DEVICE
103         }, {    /* USB host */
104                 .virtual        =  0xf8000000,
105                 .pfn            = __phys_to_pfn(0x4c000000),
106                 .length         = 0x00100000,
107                 .type           = MT_DEVICE
108         }, {    /* Camera */
109                 .virtual        =  0xfa000000,
110                 .pfn            = __phys_to_pfn(0x50000000),
111                 .length         = 0x00100000,
112                 .type           = MT_DEVICE
113         }, {    /* IMem ctl */
114                 .virtual        =  0xfe000000,
115                 .pfn            = __phys_to_pfn(0x58000000),
116                 .length         = 0x00100000,
117                 .type           = MT_DEVICE
118         }, {    /* UNCACHED_PHYS_0 */
119                 .virtual        = 0xff000000,
120                 .pfn            = __phys_to_pfn(0x00000000),
121                 .length         = 0x00100000,
122                 .type           = MT_DEVICE
123         }
124 };
125
126 void __init pxa_map_io(void)
127 {
128         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
129         get_clk_frequency_khz(1);
130 }