1 /* $NetBSD: plcom_acpi.c,v 1.4 2023/01/24 06:56:40 mlelstv Exp $ */
2
3 /*-
4 * Copyright (c) 2018 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jared McNeill <jmcneill@invisible.ca>.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: plcom_acpi.c,v 1.4 2023/01/24 06:56:40 mlelstv Exp $");
34
35 #include <sys/param.h>
36 #include <sys/bus.h>
37 #include <sys/cpu.h>
38 #include <sys/device.h>
39 #include <sys/termios.h>
40
41 #include <dev/acpi/acpireg.h>
42 #include <dev/acpi/acpivar.h>
43 #include <dev/acpi/acpi_intr.h>
44
45 #include <evbarm/dev/plcomreg.h>
46 #include <evbarm/dev/plcomvar.h>
47
48 static int plcom_acpi_match(device_t, cfdata_t, void *);
49 static void plcom_acpi_attach(device_t, device_t, void *);
50
51 CFATTACH_DECL_NEW(plcom_acpi, sizeof(struct plcom_softc), plcom_acpi_match, plcom_acpi_attach, NULL, NULL);
52
53 enum plcom_acpi_variant {
54 PLCOM_ACPI_GENERIC,
55 PLCOM_ACPI_PL011,
56 PLCOM_ACPI_BCM2837
57 };
58
59 static const struct device_compatible_entry compat_data[] = {
60 { .compat = "BCM2837", .value = PLCOM_ACPI_BCM2837 },
61 { .compat = "ARMH0011", .value = PLCOM_ACPI_PL011 },
62 { .compat = "ARMHB000", .value = PLCOM_ACPI_GENERIC },
63 DEVICE_COMPAT_EOL
64 };
65
66 static int
plcom_acpi_match(device_t parent,cfdata_t cf,void * aux)67 plcom_acpi_match(device_t parent, cfdata_t cf, void *aux)
68 {
69 struct acpi_attach_args *aa = aux;
70
71 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE)
72 return 0;
73
74 return acpi_compatible_match(aa, compat_data);
75 }
76
77 static void
plcom_acpi_attach(device_t parent,device_t self,void * aux)78 plcom_acpi_attach(device_t parent, device_t self, void *aux)
79 {
80 struct plcom_softc * const sc = device_private(self);
81 struct acpi_attach_args *aa = aux;
82 struct acpi_resources res;
83 struct acpi_mem *mem;
84 struct acpi_irq *irq;
85 ACPI_STATUS rv;
86 void *ih;
87
88 sc->sc_dev = self;
89
90 rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS",
91 &res, &acpi_resource_parse_ops_default);
92 if (ACPI_FAILURE(rv))
93 return;
94
95 mem = acpi_res_mem(&res, 0);
96 if (mem == NULL) {
97 aprint_error(": couldn't find mem resource\n");
98 goto done;
99 }
100
101 irq = acpi_res_irq(&res, 0);
102 if (irq == NULL) {
103 aprint_error(": couldn't find irq resource\n");
104 goto done;
105 }
106
107 sc->sc_hwflags = 0;
108 sc->sc_swflags = 0;
109 sc->sc_fifolen = 0;
110 sc->sc_pi.pi_type = PLCOM_TYPE_PL011;
111 sc->sc_pi.pi_flags = PLC_FLAG_32BIT_ACCESS;
112
113 switch (acpi_compatible_lookup(aa, compat_data)->value) {
114 case PLCOM_ACPI_BCM2837:
115 sc->sc_fifolen = 16;
116 break;
117 case PLCOM_ACPI_GENERIC:
118 sc->sc_pi.pi_type = PLCOM_TYPE_GENERIC_UART;
119 break;
120 }
121
122 sc->sc_pi.pi_iot = aa->aa_memt;
123 sc->sc_pi.pi_iobase = mem->ar_base;
124 if (bus_space_map(aa->aa_memt, mem->ar_base, mem->ar_length, 0, &sc->sc_pi.pi_ioh) != 0) {
125 aprint_error(": couldn't map registers\n");
126 goto done;
127 }
128
129 plcom_attach_subr(sc);
130
131 ih = acpi_intr_establish(self, (uint64_t)aa->aa_node->ad_handle,
132 IPL_SERIAL, true, plcomintr, sc, device_xname(self));
133 if (ih == NULL) {
134 aprint_error_dev(self, "couldn't install interrupt handler\n");
135 return;
136 }
137
138 done:
139 acpi_resource_cleanup(&res);
140 }
141