1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2001 M. Warner Losh <imp@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
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/param.h>
28 #include <sys/systm.h>
29 #include <sys/bus.h>
30 #include <sys/conf.h>
31 #include <sys/kernel.h>
32 #include <sys/module.h>
33 #include <machine/bus.h>
34 #include <sys/rman.h>
35 #include <machine/resource.h>
36
37 #include <dev/uart/uart.h>
38 #include <dev/uart/uart_bus.h>
39 #include <dev/uart/uart_cpu_acpi.h>
40 #include <contrib/dev/acpica/include/acpi.h>
41 #include <contrib/dev/acpica/include/accommon.h>
42 #include <dev/acpica/acpivar.h>
43
44 static int uart_acpi_probe(device_t dev);
45
46 static device_method_t uart_acpi_methods[] = {
47 /* Device interface */
48 DEVMETHOD(device_probe, uart_acpi_probe),
49 DEVMETHOD(device_attach, uart_bus_attach),
50 DEVMETHOD(device_detach, uart_bus_detach),
51 DEVMETHOD(device_resume, uart_bus_resume),
52 { 0, 0 }
53 };
54
55 static driver_t uart_acpi_driver = {
56 uart_driver_name,
57 uart_acpi_methods,
58 sizeof(struct uart_softc),
59 };
60
61 static struct acpi_uart_compat_data *
uart_acpi_find_device(device_t dev)62 uart_acpi_find_device(device_t dev)
63 {
64 struct acpi_uart_compat_data **cd, *cd_it;
65 ACPI_HANDLE h;
66
67 if ((h = acpi_get_handle(dev)) == NULL)
68 return (NULL);
69
70 SET_FOREACH(cd, uart_acpi_class_and_device_set) {
71 for (cd_it = *cd; cd_it->cd_hid != NULL; cd_it++) {
72 if (acpi_MatchHid(h, cd_it->cd_hid))
73 return (cd_it);
74 }
75 }
76
77 return (NULL);
78 }
79
80 static int
uart_acpi_probe(device_t dev)81 uart_acpi_probe(device_t dev)
82 {
83 struct acpi_uart_compat_data *cd;
84 struct uart_softc *sc;
85 uint32_t rclk;
86 ssize_t size;
87
88 sc = device_get_softc(dev);
89 rclk = 0;
90
91 cd = uart_acpi_find_device(dev);
92 if (cd == NULL)
93 return (ENXIO);
94
95 sc->sc_class = cd->cd_class;
96 if (cd->cd_desc != NULL)
97 device_set_desc(dev, cd->cd_desc);
98
99 size = device_get_property(dev, "clock-frequency", &rclk,
100 sizeof(rclk), DEVICE_PROP_UINT32);
101 if (size < 0 || rclk == 0)
102 rclk = cd->cd_rclk;
103
104 return (uart_bus_probe(dev, cd->cd_regshft, cd->cd_regiowidth,
105 rclk, 0, 0, cd->cd_quirks));
106 }
107
108 DRIVER_MODULE(uart, acpi, uart_acpi_driver, 0, 0);
109