uart_cpu_i386.c revision 168281
1105573Simp/*- 2105573Simp * Copyright (c) 2003, 2004 Marcel Moolenaar 3270242Sasomers * All rights reserved. 4270242Sasomers * 5107665Simp * Redistribution and use in source and binary forms, with or without 6107665Simp * modification, are permitted provided that the following conditions 7106906Stjr * are met: 8105573Simp * 9203916Suqs * 1. Redistributions of source code must retain the above copyright 10173739Sjb * notice, this list of conditions and the following disclaimer. 11139112Sru * 2. Redistributions in binary form must reproduce the above copyright 12119019Sgordon * notice, this list of conditions and the following disclaimer in the 13155073Spjd * documentation and/or other materials provided with the distribution. 14155073Spjd * 15105573Simp * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16105573Simp * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17105573Simp * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18105573Simp * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19105573Simp * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20105573Simp * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21270242Sasomers * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22270242Sasomers * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23270242Sasomers * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24270242Sasomers * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25105573Simp */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/dev/uart/uart_cpu_i386.c 168281 2007-04-02 22:00:22Z marcel $"); 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 = I386_BUS_SPACE_IO; 40bus_space_tag_t uart_bus_space_mem = I386_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 struct uart_class *class; 53 unsigned int i, ivar; 54 55 class = &uart_ns8250_class; 56 if (class == NULL) 57 return (ENXIO); 58 59 /* Check the environment. */ 60 if (uart_getenv(devtype, di, class) == 0) 61 return (0); 62 63 /* 64 * Scan the hints. We only try units 0 to 3 (inclusive). This 65 * covers the ISA legacy where 4 UARTs had their resources 66 * predefined. 67 */ 68 for (i = 0; i < 4; i++) { 69 if (resource_int_value("uart", i, "flags", &ivar)) 70 continue; 71 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar)) 72 continue; 73 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar)) 74 continue; 75 /* 76 * We have a possible device. Make sure it's enabled and 77 * that we have an I/O port. 78 */ 79 if (resource_int_value("uart", i, "disabled", &ivar) == 0 && 80 ivar != 0) 81 continue; 82 if (resource_int_value("uart", i, "port", &ivar) != 0 || 83 ivar == 0) 84 continue; 85 /* 86 * Got it. Fill in the instance and return it. We only have 87 * ns8250 and successors on i386. 88 */ 89 di->ops = uart_getops(class); 90 di->bas.chan = 0; 91 di->bas.bst = uart_bus_space_io; 92 if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0, 93 &di->bas.bsh) != 0) 94 continue; 95 di->bas.regshft = 0; 96 di->bas.rclk = 0; 97 if (resource_int_value("uart", i, "baud", &ivar) != 0) 98 ivar = 0; 99 di->baudrate = ivar; 100 di->databits = 8; 101 di->stopbits = 1; 102 di->parity = UART_PARITY_NONE; 103 return (0); 104 } 105 106 return (ENXIO); 107} 108