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Commit | Line | Data |
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1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/arch/sh/boards/ec3104/io.c |
1da177e4 LT |
3 | * EC3104 companion chip support |
4 | * | |
5 | * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> | |
6 | * | |
7 | */ | |
8 | /* EC3104 note: | |
9 | * This code was written without any documentation about the EC3104 chip. While | |
10 | * I hope I got most of the basic functionality right, the register names I use | |
11 | * are most likely completely different from those in the chip documentation. | |
12 | * | |
13 | * If you have any further information about the EC3104, please tell me | |
14 | * (prumpf@tux.org). | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/types.h> | |
19 | #include <asm/io.h> | |
20 | #include <asm/page.h> | |
21 | #include <asm/ec3104/ec3104.h> | |
22 | ||
23 | /* | |
24 | * EC3104 has a real ISA bus which we redirect low port accesses to (the | |
25 | * actual device on mine is a ESS 1868, and I don't want to hack the driver | |
26 | * more than strictly necessary). I am not going to duplicate the | |
27 | * hard coding of PC addresses (for the 16550s aso) here though; it's just | |
28 | * too ugly. | |
29 | */ | |
30 | ||
31 | #define low_port(port) ((port) < 0x10000) | |
32 | ||
33 | static inline unsigned long port2addr(unsigned long port) | |
34 | { | |
35 | switch(port >> 16) { | |
36 | case 0: | |
37 | return EC3104_ISA_BASE + port * 2; | |
38 | ||
39 | /* XXX hack. it's unclear what to do about the serial ports */ | |
40 | case 1: | |
41 | return EC3104_BASE + (port&0xffff) * 4; | |
42 | ||
43 | default: | |
44 | /* XXX PCMCIA */ | |
45 | return 0; | |
46 | } | |
47 | } | |
48 | ||
49 | unsigned char ec3104_inb(unsigned long port) | |
50 | { | |
51 | u8 ret; | |
52 | ||
53 | ret = *(volatile u8 *)port2addr(port); | |
54 | ||
55 | return ret; | |
56 | } | |
57 | ||
58 | unsigned short ec3104_inw(unsigned long port) | |
59 | { | |
60 | BUG(); | |
61 | } | |
62 | ||
63 | unsigned long ec3104_inl(unsigned long port) | |
64 | { | |
65 | BUG(); | |
66 | } | |
67 | ||
68 | void ec3104_outb(unsigned char data, unsigned long port) | |
69 | { | |
70 | *(volatile u8 *)port2addr(port) = data; | |
71 | } | |
72 | ||
73 | void ec3104_outw(unsigned short data, unsigned long port) | |
74 | { | |
75 | BUG(); | |
76 | } | |
77 | ||
78 | void ec3104_outl(unsigned long data, unsigned long port) | |
79 | { | |
80 | BUG(); | |
81 | } |