104 lines
1.8 KiB
C
104 lines
1.8 KiB
C
#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "io.h"
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#include "../port/error.h"
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extern PhysUart i8250physuart;
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extern PhysUart isaphysuart;
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extern void* i8250alloc(int, int, int);
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static Uart*
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uartisa(int ctlrno, ISAConf* isa)
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{
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int io;
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void *ctlr;
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Uart *uart;
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char buf[64];
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uart = malloc(sizeof(Uart));
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if(uart == nil){
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print("uartisa: no memory for Uart\n");
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return nil;
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}
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io = isa->port;
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snprint(buf, sizeof(buf), "%s%d", isaphysuart.name, ctlrno);
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if(ioalloc(io, 8, 0, buf) < 0){
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print("uartisa: I/O 0x%uX in use\n", io);
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free(uart);
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return nil;
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}
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ctlr = i8250alloc(io, isa->irq, BUSUNKNOWN);
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if(ctlr == nil){
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iofree(io);
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free(uart);
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return nil;
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}
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uart->regs = ctlr;
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snprint(buf, sizeof(buf), "COM%d", ctlrno+1);
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kstrdup(&uart->name, buf);
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uart->freq = isa->freq;
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uart->phys = &i8250physuart;
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return uart;
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}
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static Uart*
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uartisapnp(void)
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{
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int ctlrno;
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ISAConf isa;
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Uart *head, *tail, *uart;
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/*
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* Look for up to 4 discrete UARTs on the ISA bus.
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* All suitable devices are configured to simply point
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* to the generic i8250 driver.
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*/
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head = tail = nil;
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for(ctlrno = 2; ctlrno < 6; ctlrno++){
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memset(&isa, 0, sizeof(isa));
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if(!isaconfig("uart", ctlrno, &isa))
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continue;
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if(strcmp(isa.type, "isa") != 0)
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continue;
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if(isa.port == 0 || isa.irq == 0)
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continue;
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if(isa.freq == 0)
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isa.freq = 1843200;
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uart = uartisa(ctlrno, &isa);
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if(uart == nil)
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continue;
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if(head != nil)
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tail->next = uart;
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else
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head = uart;
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tail = uart;
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}
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return head;
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}
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PhysUart isaphysuart = {
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.name = "UartISA",
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.pnp = uartisapnp,
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.enable = nil,
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.disable = nil,
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.kick = nil,
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.dobreak = nil,
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.baud = nil,
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.bits = nil,
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.stop = nil,
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.parity = nil,
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.modemctl = nil,
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.rts = nil,
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.dtr = nil,
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.status = nil,
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.fifo = nil,
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};
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