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 extern int late_console; 48 49 int 50 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 51 { 52 53 return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0); 54 } 55 56 int 57 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 58 { 59 struct uart_class *class; 60 unsigned int i, ivar; 61 62 class = &uart_ns8250_class; 63 if (class == NULL) 64 return (ENXIO); 65 66 /* Check the environment. */ 67 if (uart_getenv(devtype, di, class) == 0) 68 return (0); 69 70 #ifdef DEV_ACPI 71 /* 72 * Check if SPCR can tell us what console to use. If running with 73 * !late_console, we haven't set up our own page tables yet, so we 74 * can't map ACPI tables to look at them. 75 */ 76 if (late_console && uart_cpu_acpi_spcr(devtype, di) == 0) 77 return (0); 78 #endif 79 80 /* 81 * Scan the hints. We only try units 0 to 3 (inclusive). This 82 * covers the ISA legacy where 4 UARTs had their resources 83 * predefined. 84 */ 85 for (i = 0; i < 4; i++) { 86 if (resource_int_value("uart", i, "flags", &ivar)) 87 continue; 88 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar)) 89 continue; 90 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar)) 91 continue; 92 /* 93 * We have a possible device. Make sure it's enabled and 94 * that we have an I/O port. 95 */ 96 if (resource_int_value("uart", i, "disabled", &ivar) == 0 && 97 ivar != 0) 98 continue; 99 if (resource_int_value("uart", i, "port", &ivar) != 0 || 100 ivar == 0) 101 continue; 102 /* 103 * Got it. Fill in the instance and return it. We only have 104 * ns8250 and successors on i386. 105 */ 106 di->ops = uart_getops(class); 107 di->bas.chan = 0; 108 di->bas.bst = uart_bus_space_io; 109 if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0, 110 &di->bas.bsh) != 0) 111 continue; 112 di->bas.regshft = 0; 113 di->bas.rclk = 0; 114 if (resource_int_value("uart", i, "baud", &ivar) != 0) 115 ivar = 0; 116 di->baudrate = ivar; 117 di->databits = 8; 118 di->stopbits = 1; 119 di->parity = UART_PARITY_NONE; 120 return (0); 121 } 122 123 return (ENXIO); 124 } 125