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 extern int late_console;
46
47 int
uart_cpu_eqres(struct uart_bas * b1,struct uart_bas * b2)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
uart_cpu_getdev(int devtype,struct uart_devinfo * di)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 /*
70 * Check if SPCR can tell us what console to use. If running with
71 * !late_console, we haven't set up our own page tables yet, so we
72 * can't map ACPI tables to look at them.
73 */
74 if (late_console && uart_cpu_acpi_spcr(devtype, di) == 0)
75 return (0);
76 #endif
77
78 /*
79 * Scan the hints. We only try units 0 to 3 (inclusive). This
80 * covers the ISA legacy where 4 UARTs had their resources
81 * predefined.
82 */
83 for (i = 0; i < 4; i++) {
84 if (resource_int_value("uart", i, "flags", &ivar))
85 continue;
86 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
87 continue;
88 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
89 continue;
90 /*
91 * We have a possible device. Make sure it's enabled and
92 * that we have an I/O port.
93 */
94 if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
95 ivar != 0)
96 continue;
97 if (resource_int_value("uart", i, "port", &ivar) != 0 ||
98 ivar == 0)
99 continue;
100 /*
101 * Got it. Fill in the instance and return it. We only have
102 * ns8250 and successors on i386.
103 */
104 di->ops = uart_getops(class);
105 di->bas.chan = 0;
106 di->bas.bst = uart_bus_space_io;
107 if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0,
108 &di->bas.bsh) != 0)
109 continue;
110 di->bas.regshft = 0;
111 di->bas.rclk = 0;
112 if (resource_int_value("uart", i, "baud", &ivar) != 0)
113 ivar = 0;
114 di->baudrate = ivar;
115 di->databits = 8;
116 di->stopbits = 1;
117 di->parity = UART_PARITY_NONE;
118 return (0);
119 }
120
121 return (ENXIO);
122 }
123