uart_cpu_x86.c revision 153363
1/*- 2 * Copyright (c) 2003, 2004 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/dev/uart/uart_cpu_amd64.c 153363 2005-12-12 21:00:58Z imp $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/bus.h> 33 34#include <machine/bus.h> 35 36#include <dev/uart/uart.h> 37#include <dev/uart/uart_cpu.h> 38 39bus_space_tag_t uart_bus_space_io = AMD64_BUS_SPACE_IO; 40bus_space_tag_t uart_bus_space_mem = AMD64_BUS_SPACE_MEM; 41 42int 43uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 44{ 45 46 return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0); 47} 48 49int 50uart_cpu_getdev(int devtype, struct uart_devinfo *di) 51{ 52 unsigned int i, ivar; 53 54 /* Check the environment. */ 55 di->ops = uart_ns8250_ops; 56 if (uart_getenv(devtype, di) == 0) 57 return (0); 58 59 /* 60 * Scan the hints. We only try units 0 to 3 (inclusive). This 61 * covers the ISA legacy where 4 UARTs had their resources 62 * predefined. 63 */ 64 for (i = 0; i < 4; i++) { 65 if (resource_int_value("uart", i, "flags", &ivar)) 66 continue; 67 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar)) 68 continue; 69 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar)) 70 continue; 71 /* 72 * We have a possible device. Make sure it's enabled and 73 * that we have an I/O port. 74 */ 75 if (resource_int_value("uart", i, "disabled", &ivar) == 0 && 76 ivar != 0) 77 continue; 78 if (resource_int_value("uart", i, "port", &ivar) != 0 || 79 ivar == 0) 80 continue; 81 /* 82 * Got it. Fill in the instance and return it. We only have 83 * ns8250 and successors on i386. 84 */ 85 di->ops = uart_ns8250_ops; 86 di->bas.chan = 0; 87 di->bas.bst = uart_bus_space_io; 88 if (bus_space_map(di->bas.bst, ivar, 8, 0, &di->bas.bsh) != 0) 89 continue; 90 di->bas.regshft = 0; 91 di->bas.rclk = 0; 92 if (resource_int_value("uart", i, "baud", &ivar) != 0) 93 ivar = 0; 94 di->baudrate = ivar; 95 di->databits = 8; 96 di->stopbits = 1; 97 di->parity = UART_PARITY_NONE; 98 return (0); 99 } 100 101 return (ENXIO); 102} 103