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("$FreeBSD$"); 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 39 bus_space_tag_t uart_bus_space_io = X86_BUS_SPACE_IO; 40 bus_space_tag_t uart_bus_space_mem = X86_BUS_SPACE_MEM; 41 42 int 43 uart_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 49 int 50 uart_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