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Russell Kinga09e64f2008-08-05 16:14:15 +01001/*
2 * arch/arm/mach-ns9xxx/include/mach/uncompress.h
3 *
4 * Copyright (C) 2006 by Digi International Inc.
5 * All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 */
11#ifndef __ASM_ARCH_UNCOMPRESS_H
12#define __ASM_ARCH_UNCOMPRESS_H
13
Russell Kingfced80c2008-09-06 12:10:45 +010014#include <linux/io.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010015
16#define __REG(x) ((void __iomem __force *)(x))
17
18static void putc_dummy(char c, void __iomem *base)
19{
20 /* nothing */
21}
22
23static void putc_ns9360(char c, void __iomem *base)
24{
25 static int t = 0x10000;
26 do {
27 if (t)
28 --t;
29
30 if (__raw_readl(base + 8) & (1 << 3)) {
31 __raw_writeb(c, base + 16);
32 t = 0x10000;
33 break;
34 }
35 } while (t);
36}
37
38static void putc_a9m9750dev(char c, void __iomem *base)
39{
40 static int t = 0x10000;
41 do {
42 if (t)
43 --t;
44
45 if (__raw_readb(base + 5) & (1 << 5)) {
46 __raw_writeb(c, base);
47 t = 0x10000;
48 break;
49 }
50 } while (t);
51
52}
53
54static void putc_ns921x(char c, void __iomem *base)
55{
56 static int t = 0x10000;
57 do {
58 if (t)
59 --t;
60
61 if (!(__raw_readl(base) & (1 << 11))) {
62 __raw_writeb(c, base + 0x0028);
63 t = 0x10000;
64 break;
65 }
66 } while (t);
67}
68
69#define MSCS __REG(0xA0900184)
70
71#define NS9360_UARTA __REG(0x90200040)
72#define NS9360_UARTB __REG(0x90200000)
73#define NS9360_UARTC __REG(0x90300000)
74#define NS9360_UARTD __REG(0x90300040)
75
76#define NS9360_UART_ENABLED(base) \
77 (__raw_readl(NS9360_UARTA) & (1 << 31))
78
79#define A9M9750DEV_UARTA __REG(0x40000000)
80
81#define NS921XSYS_CLOCK __REG(0xa090017c)
82#define NS921X_UARTA __REG(0x90010000)
83#define NS921X_UARTB __REG(0x90018000)
84#define NS921X_UARTC __REG(0x90020000)
85#define NS921X_UARTD __REG(0x90028000)
86
87#define NS921X_UART_ENABLED(base) \
88 (__raw_readl((base) + 0x1000) & (1 << 29))
89
90static void autodetect(void (**putc)(char, void __iomem *), void __iomem **base)
91{
92 if (((__raw_readl(MSCS) >> 16) & 0xfe) == 0x00) {
93 /* ns9360 or ns9750 */
94 if (NS9360_UART_ENABLED(NS9360_UARTA)) {
95 *putc = putc_ns9360;
96 *base = NS9360_UARTA;
97 return;
98 } else if (NS9360_UART_ENABLED(NS9360_UARTB)) {
99 *putc = putc_ns9360;
100 *base = NS9360_UARTB;
101 return;
102 } else if (NS9360_UART_ENABLED(NS9360_UARTC)) {
103 *putc = putc_ns9360;
104 *base = NS9360_UARTC;
105 return;
106 } else if (NS9360_UART_ENABLED(NS9360_UARTD)) {
107 *putc = putc_ns9360;
108 *base = NS9360_UARTD;
109 return;
110 } else if (__raw_readl(__REG(0xa09001f4)) == 0xfffff001) {
111 *putc = putc_a9m9750dev;
112 *base = A9M9750DEV_UARTA;
113 return;
114 }
115 } else if (((__raw_readl(MSCS) >> 16) & 0xfe) == 0x02) {
116 /* ns921x */
117 u32 clock = __raw_readl(NS921XSYS_CLOCK);
118
119 if ((clock & (1 << 1)) &&
120 NS921X_UART_ENABLED(NS921X_UARTA)) {
121 *putc = putc_ns921x;
122 *base = NS921X_UARTA;
123 return;
124 } else if ((clock & (1 << 2)) &&
125 NS921X_UART_ENABLED(NS921X_UARTB)) {
126 *putc = putc_ns921x;
127 *base = NS921X_UARTB;
128 return;
129 } else if ((clock & (1 << 3)) &&
130 NS921X_UART_ENABLED(NS921X_UARTC)) {
131 *putc = putc_ns921x;
132 *base = NS921X_UARTC;
133 return;
134 } else if ((clock & (1 << 4)) &&
135 NS921X_UART_ENABLED(NS921X_UARTD)) {
136 *putc = putc_ns921x;
137 *base = NS921X_UARTD;
138 return;
139 }
140 }
141
142 *putc = putc_dummy;
143}
144
145void (*myputc)(char, void __iomem *);
146void __iomem *base;
147
148static void putc(char c)
149{
150 myputc(c, base);
151}
152
153static void arch_decomp_setup(void)
154{
155 autodetect(&myputc, &base);
156}
157#define arch_decomp_wdog()
158
159static void flush(void)
160{
161 /* nothing */
162}
163
164#endif /* ifndef __ASM_ARCH_UNCOMPRESS_H */