uart_cpu_x86.c revision 133735
1100978Srwatson/* 2126097Srwatson * Copyright (c) 2003, 2004 Marcel Moolenaar 3145167Srwatson * All rights reserved. 4163606Srwatson * 5100978Srwatson * Redistribution and use in source and binary forms, with or without 6100978Srwatson * modification, are permitted provided that the following conditions 7100978Srwatson * are met: 8100978Srwatson * 9106392Srwatson * 1. Redistributions of source code must retain the above copyright 10106392Srwatson * notice, this list of conditions and the following disclaimer. 11106392Srwatson * 2. Redistributions in binary form must reproduce the above copyright 12106392Srwatson * notice, this list of conditions and the following disclaimer in the 13100978Srwatson * documentation and/or other materials provided with the distribution. 14147784Srwatson * 15147784Srwatson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16147784Srwatson * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17100978Srwatson * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18100978Srwatson * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19100978Srwatson * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20100978Srwatson * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21100978Srwatson * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22100978Srwatson * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23100978Srwatson * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24100978Srwatson * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25100978Srwatson */ 26100978Srwatson 27100978Srwatson#include <sys/cdefs.h> 28100978Srwatson__FBSDID("$FreeBSD: head/sys/dev/uart/uart_cpu_amd64.c 133735 2004-08-14 23:54:27Z marius $"); 29100978Srwatson 30100978Srwatson#include <sys/param.h> 31100978Srwatson#include <sys/systm.h> 32100978Srwatson#include <sys/bus.h> 33100978Srwatson 34100978Srwatson#include <machine/bus.h> 35100978Srwatson 36100978Srwatson#include <dev/uart/uart.h> 37100978Srwatson#include <dev/uart/uart_cpu.h> 38100978Srwatson 39100978Srwatsonbus_space_tag_t uart_bus_space_io = AMD64_BUS_SPACE_IO; 40145167Srwatsonbus_space_tag_t uart_bus_space_mem = AMD64_BUS_SPACE_MEM; 41100978Srwatson 42163606Srwatsonint 43163606Srwatsonuart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 44102123Srwatson{ 45102123Srwatson 46163606Srwatson return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0); 47163686Srwatson} 48105693Srwatson 49105693Srwatsonint 50163606Srwatsonuart_cpu_getdev(int devtype, struct uart_devinfo *di) 51163606Srwatson{ 52105693Srwatson unsigned int i, ivar; 53168933Srwatson 54171047Srwatson /* Check the environment. */ 55100978Srwatson if (uart_getenv(devtype, di) == 0) 56130585Sphk return (0); 57100978Srwatson 58100978Srwatson /* 59100978Srwatson * Scan the hints. We only try units 0 to 3 (inclusive). This 60100978Srwatson * covers the ISA legacy where 4 UARTs had their resources 61106468Srwatson * predefined. 62122875Srwatson */ 63100978Srwatson for (i = 0; i < 4; i++) { 64145855Srwatson if (resource_int_value("uart", i, "flags", &ivar)) 65166533Srwatson continue; 66113487Srwatson if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar)) 67163606Srwatson continue; 68100978Srwatson if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar)) 69100978Srwatson continue; 70137815Srwatson /* 71137815Srwatson * We have a possible device. Make sure it's enabled and 72100978Srwatson * that we have an I/O port. 73137815Srwatson */ 74137815Srwatson if (resource_int_value("uart", i, "disabled", &ivar) == 0 && 75100978Srwatson ivar != 0) 76100978Srwatson continue; 77126121Spjd if (resource_int_value("uart", i, "port", &ivar) != 0 || 78126121Spjd ivar == 0) 79125293Srwatson continue; 80104338Srwatson /* 81100978Srwatson * Got it. Fill in the instance and return it. We only have 82100978Srwatson * ns8250 and successors on i386. 83100978Srwatson */ 84100978Srwatson di->ops = uart_ns8250_ops; 85100978Srwatson di->bas.chan = 0; 86163606Srwatson di->bas.bst = uart_bus_space_io; 87100978Srwatson if (bus_space_map(di->bas.bst, ivar, 8, 0, &di->bas.bsh) != 0) 88100978Srwatson continue; 89100978Srwatson di->bas.regshft = 0; 90100978Srwatson di->bas.rclk = 0; 91163606Srwatson if (resource_int_value("uart", i, "baud", &ivar) != 0) 92100978Srwatson ivar = 0; 93172990Srwatson di->baudrate = ivar; 94172990Srwatson di->databits = 8; 95172990Srwatson di->stopbits = 1; 96172990Srwatson di->parity = UART_PARITY_NONE; 97172930Srwatson return (0); 98172990Srwatson } 99172990Srwatson 100172990Srwatson return (ENXIO); 101172990Srwatson} 102172930Srwatson 103100978Srwatsonvoid 104172930Srwatsonuart_cpu_identify(driver_t *driver, device_t parent) 105147982Srwatson{ 106172930Srwatson 107107698Srwatson} 108172930Srwatson