Subversion Repositories planix.SVN

Rev

Rev 2 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 - 1 
#include "u.h"
2 
#include "../port/lib.h"
3 
#include "mem.h"
4 
#include "dat.h"
5 
#include "fns.h"
6 
#include "io.h"
7 
#include "../port/error.h"
8 
 
9 
extern PhysUart i8250physuart;
10 
extern PhysUart isaphysuart;
11 
extern void* i8250alloc(int, int, int);
12 
 
13 
static Uart*
14 
uartisa(int ctlrno, ISAConf* isa)
15 
{
16 
	int io;
17 
	void *ctlr;
18 
	Uart *uart;
19 
	char buf[64];
20 
 
21 
	io = isa->port;
22 
	snprint(buf, sizeof(buf), "%s%d", isaphysuart.name, ctlrno);
23 
	if(ioalloc(io, 8, 0, buf) < 0){
24 
		print("uartisa: I/O 0x%uX in use\n", io);
25 
		return nil;
26 
	}
27 
 
28 
	uart = malloc(sizeof(Uart));
29 
	ctlr = i8250alloc(io, isa->irq, BUSUNKNOWN);
30 
	if(uart == nil || ctlr == nil){
31 
		iofree(io);
32 
		free(uart);
33 
		free(ctlr);
34 
		return nil;
35 
	}
36 
 
37 
	uart->regs = ctlr;
38 
	snprint(buf, sizeof(buf), "COM%d", ctlrno+1);
39 
	kstrdup(&uart->name, buf);
40 
	uart->freq = isa->freq;
41 
	uart->phys = &i8250physuart;
42 
 
43 
	return uart;
44 
}
45 
 
46 
static Uart*
47 
uartisapnp(void)
48 
{
49 
	int ctlrno;
50 
	ISAConf isa;
51 
	Uart *head, *tail, *uart;
52 
 
53 
	/*
54 
	 * Look for up to 4 discrete UARTs on the ISA bus.
55 
	 * All suitable devices are configured to simply point
56 
	 * to the generic i8250 driver.
57 
	 */
58 
	head = tail = nil;
59 
	for(ctlrno = 2; ctlrno < 6; ctlrno++){
60 
		memset(&isa, 0, sizeof(isa));
61 
		if(!isaconfig("uart", ctlrno, &isa))
62 
			continue;
63 
		if(strcmp(isa.type, "isa") != 0)
64 
			continue;
65 
		if(isa.port == 0 || isa.irq == 0)
66 
			continue;
67 
		if(isa.freq == 0)
68 
			isa.freq = 1843200;
69 
		uart = uartisa(ctlrno, &isa);
70 
		if(uart == nil)
71 
			continue;
72 
		if(head != nil)
73 
			tail->next = uart;
74 
		else
75 
			head = uart;
76 
		tail = uart;
77 
	}
78 
 
79 
	return head;
80 
}
81 
 
82 
PhysUart isaphysuart = {
83 
	.name		= "UartISA",
84 
	.pnp		= uartisapnp,
85 
	.enable		= nil,
86 
	.disable	= nil,
87 
	.kick		= nil,
88 
	.dobreak	= nil,
89 
	.baud		= nil,
90 
	.bits		= nil,
91 
	.stop		= nil,
92 
	.parity		= nil,
93 
	.modemctl	= nil,
94 
	.rts		= nil,
95 
	.dtr		= nil,
96 
	.status		= nil,
97 
	.fifo		= nil,
98 
};