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 
port2addr(unsigned long port)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 
ec3104_inb(unsigned long port)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 
ec3104_inw(unsigned long port)58 unsigned short ec3104_inw(unsigned long port)
59 {
60 	BUG();
61 }
62 
ec3104_inl(unsigned long port)63 unsigned long ec3104_inl(unsigned long port)
64 {
65 	BUG();
66 }
67 
ec3104_outb(unsigned char data,unsigned long port)68 void ec3104_outb(unsigned char data, unsigned long port)
69 {
70 	*(volatile u8 *)port2addr(port) = data;
71 }
72 
ec3104_outw(unsigned short data,unsigned long port)73 void ec3104_outw(unsigned short data, unsigned long port)
74 {
75 	BUG();
76 }
77 
ec3104_outl(unsigned long data,unsigned long port)78 void ec3104_outl(unsigned long data, unsigned long port)
79 {
80 	BUG();
81 }
82