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 <mach/hardware.h>
24 #include <asm/system.h>
25 #include <asm/pgtable.h>
26 #include <asm/mach/map.h>
27 #include <asm/mach-types.h>
28
29 #include <mach/reset.h>
30 #include <mach/gpio.h>
31 #include <mach/pxa2xx-gpio.h>
32
33 #include "generic.h"
34
35 void clear_reset_status(unsigned int mask)
36 {
37 if (cpu_is_pxa2xx())
38 pxa2xx_clear_reset_status(mask);
39
40 if (cpu_is_pxa3xx())
41 pxa3xx_clear_reset_status(mask);
42 }
43
44 unsigned long get_clock_tick_rate(void)
45 {
46 unsigned long clock_tick_rate;
47
48 if (cpu_is_pxa25x())
49 clock_tick_rate = 3686400;
50 else if (machine_is_mainstone())
51 clock_tick_rate = 3249600;
52 else
53 clock_tick_rate = 3250000;
54
55 return clock_tick_rate;
56 }
57 EXPORT_SYMBOL(get_clock_tick_rate);
58
59 /*
60 * Get the clock frequency as reflected by CCCR and the turbo flag.
61 * We assume these values have been applied via a fcs.
62 * If info is not 0 we also display the current settings.
63 */
64 unsigned int get_clk_frequency_khz(int info)
65 {
66 if (cpu_is_pxa25x())
67 return pxa25x_get_clk_frequency_khz(info);
68 else if (cpu_is_pxa27x())
69 return pxa27x_get_clk_frequency_khz(info);
70 else
71 return pxa3xx_get_clk_frequency_khz(info);
72 }
73 EXPORT_SYMBOL(get_clk_frequency_khz);
74
75 /*
76 * Return the current memory clock frequency in units of 10kHz
77 */
78 unsigned int get_memclk_frequency_10khz(void)
79 {
80 if (cpu_is_pxa25x())
81 return pxa25x_get_memclk_frequency_10khz();
82 else if (cpu_is_pxa27x())
83 return pxa27x_get_memclk_frequency_10khz();
84 else
85 return pxa3xx_get_memclk_frequency_10khz();
86 }
87 EXPORT_SYMBOL(get_memclk_frequency_10khz);
88
89 /*
90 * Intel PXA2xx internal register mapping.
91 *
92 * Note 1: not all PXA2xx variants implement all those addresses.
93 *
94 * Note 2: virtual 0xfffe0000-0xffffffff is reserved for the vector table
95 * and cache flush area.
96 */
97 static struct map_desc standard_io_desc[] __initdata = {
98 { /* Devs */
99 .virtual = 0xf2000000,
100 .pfn = __phys_to_pfn(0x40000000),
101 .length = 0x02000000,
102 .type = MT_DEVICE
103 }, { /* Mem Ctl */
104 .virtual = 0xf6000000,
105 .pfn = __phys_to_pfn(0x48000000),
106 .length = 0x00200000,
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 }
131
132 /*
133 * Configure pins for GPIO or other functions
134 */
135 int pxa_gpio_mode(int gpio_mode)
136 {
137 unsigned long flags;
138 int gpio = gpio_mode & GPIO_MD_MASK_NR;
139 int fn = (gpio_mode & GPIO_MD_MASK_FN) >> 8;
140 int gafr;
141
142 if (gpio > pxa_last_gpio)
143 return -EINVAL;
144
145 local_irq_save(flags);
146 if (gpio_mode & GPIO_DFLT_LOW)
147 GPCR(gpio) = GPIO_bit(gpio);
148 else if (gpio_mode & GPIO_DFLT_HIGH)
149 GPSR(gpio) = GPIO_bit(gpio);
150 if (gpio_mode & GPIO_MD_MASK_DIR)
151 GPDR(gpio) |= GPIO_bit(gpio);
152 else
153 GPDR(gpio) &= ~GPIO_bit(gpio);
154 gafr = GAFR(gpio) & ~(0x3 << (((gpio) & 0xf)*2));
155 GAFR(gpio) = gafr | (fn << (((gpio) & 0xf)*2));
156 local_irq_restore(flags);
157
158 return 0;
159 }
160 EXPORT_SYMBOL(pxa_gpio_mode);
161
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