File: /usr/src/linux/arch/sh/kernel/io_ec3104.c

1     /*
2      * linux/arch/sh/kernel/io_ec3104.c
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.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     }
82