1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/bus.h>
35
36 #include <machine/bus.h>
37
38 #include <dev/uart/uart.h>
39 #include <dev/uart/uart_cpu.h>
40 #include <dev/uart/uart_cpu_acpi.h>
41
42 bus_space_tag_t uart_bus_space_io = X86_BUS_SPACE_IO;
43 bus_space_tag_t uart_bus_space_mem = X86_BUS_SPACE_MEM;
44
45 int
uart_cpu_eqres(struct uart_bas * b1,struct uart_bas * b2)46 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
47 {
48
49 return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
50 }
51
52 int
uart_cpu_getdev(int devtype,struct uart_devinfo * di)53 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
54 {
55 struct uart_class *class;
56 unsigned int i, ivar;
57
58 class = &uart_ns8250_class;
59 if (class == NULL)
60 return (ENXIO);
61
62 /* Check the environment. */
63 if (uart_getenv(devtype, di, class) == 0)
64 return (0);
65
66 #ifdef DEV_ACPI
67 /* Check if SPCR can tell us what console to use. */
68 if (uart_cpu_acpi_spcr(devtype, di) == 0)
69 return (0);
70 #endif
71
72 /*
73 * Scan the hints. We only try units 0 to 3 (inclusive). This
74 * covers the ISA legacy where 4 UARTs had their resources
75 * predefined.
76 */
77 for (i = 0; i < 4; i++) {
78 if (resource_int_value("uart", i, "flags", &ivar))
79 continue;
80 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
81 continue;
82 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
83 continue;
84 /*
85 * We have a possible device. Make sure it's enabled and
86 * that we have an I/O port.
87 */
88 if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
89 ivar != 0)
90 continue;
91 if (resource_int_value("uart", i, "port", &ivar) != 0 ||
92 ivar == 0)
93 continue;
94 /*
95 * Got it. Fill in the instance and return it. We only have
96 * ns8250 and successors on i386.
97 */
98 di->ops = uart_getops(class);
99 di->bas.chan = 0;
100 di->bas.bst = uart_bus_space_io;
101 if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0,
102 &di->bas.bsh) != 0)
103 continue;
104 di->bas.regshft = 0;
105 di->bas.rclk = 0;
106 if (resource_int_value("uart", i, "baud", &ivar) != 0)
107 ivar = 0;
108 di->baudrate = ivar;
109 di->databits = 8;
110 di->stopbits = 1;
111 di->parity = UART_PARITY_NONE;
112 return (0);
113 }
114
115 return (ENXIO);
116 }
117