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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mach-pxa/pxa27x.c | |
3 | * | |
4 | * Author: Nicolas Pitre | |
5 | * Created: Nov 05, 2002 | |
6 | * Copyright: MontaVista Software Inc. | |
7 | * | |
8 | * Code specific to PXA27x aka Bulverde. | |
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 | #include <linux/config.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/pm.h> | |
19 | #include <linux/device.h> | |
20 | ||
21 | #include <asm/hardware.h> | |
22 | #include <asm/irq.h> | |
23 | #include <asm/arch/pxa-regs.h> | |
24 | ||
25 | #include "generic.h" | |
26 | ||
27 | /* Crystal clock: 13MHz */ | |
28 | #define BASE_CLK 13000000 | |
29 | ||
30 | /* | |
31 | * Get the clock frequency as reflected by CCSR and the turbo flag. | |
32 | * We assume these values have been applied via a fcs. | |
33 | * If info is not 0 we also display the current settings. | |
34 | */ | |
35 | unsigned int get_clk_frequency_khz( int info) | |
36 | { | |
37 | unsigned long ccsr, clkcfg; | |
38 | unsigned int l, L, m, M, n2, N, S; | |
39 | int cccr_a, t, ht, b; | |
40 | ||
41 | ccsr = CCSR; | |
42 | cccr_a = CCCR & (1 << 25); | |
43 | ||
44 | /* Read clkcfg register: it has turbo, b, half-turbo (and f) */ | |
45 | asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) ); | |
46 | t = clkcfg & (1 << 1); | |
47 | ht = clkcfg & (1 << 2); | |
48 | b = clkcfg & (1 << 3); | |
49 | ||
50 | l = ccsr & 0x1f; | |
51 | n2 = (ccsr>>7) & 0xf; | |
52 | m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4; | |
53 | ||
54 | L = l * BASE_CLK; | |
55 | N = (L * n2) / 2; | |
56 | M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2)); | |
57 | S = (b) ? L : (L/2); | |
58 | ||
59 | if (info) { | |
60 | printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n", | |
61 | L / 1000000, (L % 1000000) / 10000, l ); | |
62 | printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n", | |
63 | N / 1000000, (N % 1000000)/10000, n2 / 2, (n2 % 2)*5, | |
64 | (t) ? "" : "in" ); | |
65 | printk( KERN_INFO "Memory clock: %d.%02dMHz (/%d)\n", | |
66 | M / 1000000, (M % 1000000) / 10000, m ); | |
67 | printk( KERN_INFO "System bus clock: %d.%02dMHz \n", | |
68 | S / 1000000, (S % 1000000) / 10000 ); | |
69 | } | |
70 | ||
71 | return (t) ? (N/1000) : (L/1000); | |
72 | } | |
73 | ||
74 | /* | |
75 | * Return the current mem clock frequency in units of 10kHz as | |
76 | * reflected by CCCR[A], B, and L | |
77 | */ | |
78 | unsigned int get_memclk_frequency_10khz(void) | |
79 | { | |
80 | unsigned long ccsr, clkcfg; | |
81 | unsigned int l, L, m, M; | |
82 | int cccr_a, b; | |
83 | ||
84 | ccsr = CCSR; | |
85 | cccr_a = CCCR & (1 << 25); | |
86 | ||
87 | /* Read clkcfg register: it has turbo, b, half-turbo (and f) */ | |
88 | asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) ); | |
89 | b = clkcfg & (1 << 3); | |
90 | ||
91 | l = ccsr & 0x1f; | |
92 | m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4; | |
93 | ||
94 | L = l * BASE_CLK; | |
95 | M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2)); | |
96 | ||
97 | return (M / 10000); | |
98 | } | |
99 | ||
100 | /* | |
101 | * Return the current LCD clock frequency in units of 10kHz as | |
102 | */ | |
103 | unsigned int get_lcdclk_frequency_10khz(void) | |
104 | { | |
105 | unsigned long ccsr; | |
106 | unsigned int l, L, k, K; | |
107 | ||
108 | ccsr = CCSR; | |
109 | ||
110 | l = ccsr & 0x1f; | |
111 | k = (l <= 7) ? 1 : (l <= 16) ? 2 : 4; | |
112 | ||
113 | L = l * BASE_CLK; | |
114 | K = L / k; | |
115 | ||
116 | return (K / 10000); | |
117 | } | |
118 | ||
119 | EXPORT_SYMBOL(get_clk_frequency_khz); | |
120 | EXPORT_SYMBOL(get_memclk_frequency_10khz); | |
121 | EXPORT_SYMBOL(get_lcdclk_frequency_10khz); | |
122 | ||
123 | ||
124 | /* | |
125 | * device registration specific to PXA27x. | |
126 | */ | |
127 | ||
128 | static u64 pxa27x_dmamask = 0xffffffffUL; | |
129 | ||
130 | static struct resource pxa27x_ohci_resources[] = { | |
131 | [0] = { | |
132 | .start = 0x4C000000, | |
133 | .end = 0x4C00ff6f, | |
134 | .flags = IORESOURCE_MEM, | |
135 | }, | |
136 | [1] = { | |
137 | .start = IRQ_USBH1, | |
138 | .end = IRQ_USBH1, | |
139 | .flags = IORESOURCE_IRQ, | |
140 | }, | |
141 | }; | |
142 | ||
143 | static struct platform_device ohci_device = { | |
144 | .name = "pxa27x-ohci", | |
145 | .id = -1, | |
146 | .dev = { | |
147 | .dma_mask = &pxa27x_dmamask, | |
148 | .coherent_dma_mask = 0xffffffff, | |
149 | }, | |
150 | .num_resources = ARRAY_SIZE(pxa27x_ohci_resources), | |
151 | .resource = pxa27x_ohci_resources, | |
152 | }; | |
153 | ||
154 | static struct platform_device *devices[] __initdata = { | |
155 | &ohci_device, | |
156 | }; | |
157 | ||
158 | static int __init pxa27x_init(void) | |
159 | { | |
160 | return platform_add_devices(devices, ARRAY_SIZE(devices)); | |
161 | } | |
162 | ||
163 | subsys_initcall(pxa27x_init); |