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/param.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34
35 #include <machine/bus.h>
36
37 #include <dev/uart/uart.h>
38 #include <dev/uart/uart_cpu.h>
39 #include <dev/uart/uart_cpu_acpi.h>
40
41 bus_space_tag_t uart_bus_space_io = X86_BUS_SPACE_IO;
42 bus_space_tag_t uart_bus_space_mem = X86_BUS_SPACE_MEM;
43
44 extern int late_console;
45
46 int
uart_cpu_eqres(struct uart_bas * b1,struct uart_bas * b2)47 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
48 {
49
50 return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
51 }
52
53 int
uart_cpu_getdev(int devtype,struct uart_devinfo * di)54 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
55 {
56 struct uart_class *class;
57 unsigned int i, ivar;
58
59 class = &uart_ns8250_class;
60 if (class == NULL)
61 return (ENXIO);
62
63 /* Check the environment. */
64 if (uart_getenv(devtype, di, class) == 0)
65 return (0);
66
67 #ifdef DEV_ACPI
68 /*
69 * Check if SPCR can tell us what console to use. If running with
70 * !late_console, we haven't set up our own page tables yet, so we
71 * can't map ACPI tables to look at them.
72 */
73 if (late_console && uart_cpu_acpi_setup(devtype, di) == 0)
74 return (0);
75 #endif
76
77 /*
78 * Scan the hints. We only try units 0 to 3 (inclusive). This
79 * covers the ISA legacy where 4 UARTs had their resources
80 * predefined.
81 */
82 for (i = 0; i < 4; i++) {
83 if (resource_int_value("uart", i, "flags", &ivar))
84 continue;
85 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
86 continue;
87 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
88 continue;
89 /*
90 * We have a possible device. Make sure it's enabled and
91 * that we have an I/O port.
92 */
93 if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
94 ivar != 0)
95 continue;
96 if (resource_int_value("uart", i, "port", &ivar) != 0 ||
97 ivar == 0)
98 continue;
99 /*
100 * Got it. Fill in the instance and return it. We only have
101 * ns8250 and successors on i386.
102 */
103 di->ops = uart_getops(class);
104 di->bas.chan = 0;
105 di->bas.bst = uart_bus_space_io;
106 if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0,
107 &di->bas.bsh) != 0)
108 continue;
109 di->bas.regshft = 0;
110 di->bas.rclk = 0;
111 if (resource_int_value("uart", i, "baud", &ivar) != 0)
112 ivar = 0;
113 di->baudrate = ivar;
114 di->databits = 8;
115 di->stopbits = 1;
116 di->parity = UART_PARITY_NONE;
117 return (0);
118 }
119
120 return (ENXIO);
121 }
122