1 /* $NetBSD: dwcwdt_acpi.c,v 1.1 2023/04/16 16:55:01 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2023 Jared McNeill <jmcneill@invisible.ca>
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 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: dwcwdt_acpi.c,v 1.1 2023/04/16 16:55:01 jmcneill Exp $");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/device.h>
35 #include <sys/intr.h>
36 #include <sys/systm.h>
37 #include <sys/mutex.h>
38 #include <sys/wdog.h>
39
40 #include <dev/sysmon/sysmonvar.h>
41 #include <dev/ic/dwc_wdt_var.h>
42
43 #include <dev/acpi/acpireg.h>
44 #include <dev/acpi/acpivar.h>
45
46 static const struct device_compatible_entry compat_data[] = {
47 { .compat = "snps,dw-wdt" },
48 DEVICE_COMPAT_EOL
49 };
50
51 static int
dwcwdt_acpi_match(device_t parent,cfdata_t cf,void * aux)52 dwcwdt_acpi_match(device_t parent, cfdata_t cf, void *aux)
53 {
54 struct acpi_attach_args *aa = aux;
55
56 return acpi_compatible_match(aa, compat_data);
57 }
58
59 static void
dwcwdt_acpi_attach(device_t parent,device_t self,void * aux)60 dwcwdt_acpi_attach(device_t parent, device_t self, void *aux)
61 {
62 struct dwcwdt_softc * const sc = device_private(self);
63 struct acpi_attach_args *aa = aux;
64 ACPI_HANDLE handle = aa->aa_node->ad_handle;
65 struct acpi_resources res;
66 struct acpi_mem *mem;
67 ACPI_INTEGER ival;
68 ACPI_STATUS rv;
69
70 rv = acpi_resource_parse(sc->sc_dev, handle, "_CRS",
71 &res, &acpi_resource_parse_ops_default);
72 if (ACPI_FAILURE(rv)) {
73 return;
74 }
75
76 mem = acpi_res_mem(&res, 0);
77 if (mem == NULL) {
78 aprint_error_dev(self, "couldn't find mem resource\n");
79 goto done;
80 }
81
82 sc->sc_dev = self;
83 sc->sc_bst = aa->aa_memt;
84 if (bus_space_map(sc->sc_bst, mem->ar_base, mem->ar_length,
85 0, &sc->sc_bsh) != 0) {
86 aprint_error_dev(self, "couldn't map registers\n");
87 goto done;
88 }
89 if (ACPI_SUCCESS(acpi_dsd_integer(handle, "clock-frequency", &ival))) {
90 sc->sc_clkrate = ival;
91 }
92
93 dwcwdt_init(sc);
94
95 done:
96 acpi_resource_cleanup(&res);
97 }
98
99 CFATTACH_DECL_NEW(dwcwdt_acpi, sizeof(struct dwcwdt_softc),
100 dwcwdt_acpi_match, dwcwdt_acpi_attach, NULL, NULL);
101