1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2003, 2004 Marcel Moolenaar 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "opt_acpi.h" 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/bus.h> 37 38 #include <machine/bus.h> 39 40 #include <dev/uart/uart.h> 41 #include <dev/uart/uart_cpu.h> 42 #include <dev/uart/uart_cpu_acpi.h> 43 44 bus_space_tag_t uart_bus_space_io = X86_BUS_SPACE_IO; 45 bus_space_tag_t uart_bus_space_mem = X86_BUS_SPACE_MEM; 46 47 int 48 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 49 { 50 51 return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0); 52 } 53 54 int 55 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 56 { 57 struct uart_class *class; 58 unsigned int i, ivar; 59 60 class = &uart_ns8250_class; 61 if (class == NULL) 62 return (ENXIO); 63 64 /* Check the environment. */ 65 if (uart_getenv(devtype, di, class) == 0) 66 return (0); 67 68 #ifdef DEV_ACPI 69 /* Check if SPCR can tell us what console to use. */ 70 if (uart_cpu_acpi_spcr(devtype, di) == 0) 71 return (0); 72 #endif 73 74 /* 75 * Scan the hints. We only try units 0 to 3 (inclusive). This 76 * covers the ISA legacy where 4 UARTs had their resources 77 * predefined. 78 */ 79 for (i = 0; i < 4; i++) { 80 if (resource_int_value("uart", i, "flags", &ivar)) 81 continue; 82 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar)) 83 continue; 84 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar)) 85 continue; 86 /* 87 * We have a possible device. Make sure it's enabled and 88 * that we have an I/O port. 89 */ 90 if (resource_int_value("uart", i, "disabled", &ivar) == 0 && 91 ivar != 0) 92 continue; 93 if (resource_int_value("uart", i, "port", &ivar) != 0 || 94 ivar == 0) 95 continue; 96 /* 97 * Got it. Fill in the instance and return it. We only have 98 * ns8250 and successors on i386. 99 */ 100 di->ops = uart_getops(class); 101 di->bas.chan = 0; 102 di->bas.bst = uart_bus_space_io; 103 if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0, 104 &di->bas.bsh) != 0) 105 continue; 106 di->bas.regshft = 0; 107 di->bas.rclk = 0; 108 if (resource_int_value("uart", i, "baud", &ivar) != 0) 109 ivar = 0; 110 di->baudrate = ivar; 111 di->databits = 8; 112 di->stopbits = 1; 113 di->parity = UART_PARITY_NONE; 114 return (0); 115 } 116 117 return (ENXIO); 118 } 119