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- .TH UARTP8250 9
- .SH NAME
- uartp8250 \- portable 8250-style uarts
- .SH SYNOPSIS
- .EX
- #include "../port/uartp8250.h"
- typedef struct Ctlr Ctlr;
- struct Ctlr {
- void *reg;
- uint (*get)(void*, int);
- void (*set)(void*, int, uint);
- int (*itr)(Uart*, int);
- int irq;
- int tbdf;
- int iena;
- uchar sticky[8];
- Lock;
- int hasfifo;
- int checkfifo;
- int fena;
- };
- .EE
- .PP
- .ta \w'\fLPhysUart 'u
- .PP
- .B
- PhysUart p8250physuart;
- .PP
- .B
- void i8250interrupt(Ureg*, void*);
- .SH DESCRIPTION
- P8250 provides a portable interface for 8250-style uarts.
- All necessary functions are provided except for
- .BR get ,
- .BR set ,
- and
- .BR itr .
- These functions get or set an 8250 register or enable
- or disable the interrupt, respectively. Since the
- .B PhysUart
- structure is required for device discovery, a dummy
- version needs to be provided
- .IP
- .EX
- PhysUart myphysuart = {
- .name = "myuart",
- .pnp = mypnp,
- };
- .EE
- .PP
- On entry of the pnp function, the
- .B PhysUart
- can be filled out:
- .EX
- memmove(&myphysuart, &p8250physuart, sizeof(PhysUart));
- myphysuart.name = "myuart";
- myphysuart.pnp = mypnp;
- .EE
- .PP
- as can the
- .B Ctlr
- structure, which is assigned to
- .BR "uart->regs" .
- .SH SOURCE
- .B /sys/src/9/port/uartp8250.h
- .br
- .B /sys/src/9/port/uartp8250.c
- .SH "SEE ALSO"
- .IR uart (3).
- .SH BUGS
- The
- .B PhysUart
- is uncomfortable to use for device discovery.
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