1 /* $NetBSD: dwiic_acpi.c,v 1.10 2022/10/19 22:28:35 riastradh 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: dwiic_acpi.c,v 1.10 2022/10/19 22:28:35 riastradh Exp $");
34
35 #include <sys/param.h>
36 #include <sys/bus.h>
37 #include <sys/cpu.h>
38 #include <sys/device.h>
39
40 #include <dev/acpi/acpireg.h>
41 #include <dev/acpi/acpivar.h>
42 #include <dev/acpi/acpi_intr.h>
43 #include <dev/acpi/acpi_i2c.h>
44
45 #include <dev/ic/dwiic_var.h>
46
47 struct dwiic_acpi_param {
48 uint16_t hcnt;
49 uint16_t lcnt;
50 uint32_t ht;
51 };
52
53 static int dwiic_acpi_match(device_t, cfdata_t, void *);
54 static void dwiic_acpi_attach(device_t, device_t, void *);
55
56 static void dwiic_acpi_parse_param(struct dwiic_softc *, ACPI_HANDLE,
57 const char *, struct dwiic_acpi_param *);
58 static void dwiic_acpi_configure(struct dwiic_softc *, ACPI_HANDLE);
59
60 CFATTACH_DECL_NEW(dwiic_acpi, sizeof(struct dwiic_softc), dwiic_acpi_match, dwiic_acpi_attach, NULL, NULL);
61
62 static const struct device_compatible_entry compat_data[] = {
63 { .compat = "AMD0010" }, /* AMD FCH */
64 { .compat = "AMDI0010" }, /* AMD FCH */
65 { .compat = "AMDI0510" }, /* AMD Seattle */
66 { .compat = "APMC0D0F" }, /* Ampere eMAG */
67 DEVICE_COMPAT_EOL
68 };
69
70 static int
dwiic_acpi_match(device_t parent,cfdata_t cf,void * aux)71 dwiic_acpi_match(device_t parent, cfdata_t cf, void *aux)
72 {
73 struct acpi_attach_args *aa = aux;
74
75 return acpi_compatible_match(aa, compat_data);
76 }
77
78 static void
dwiic_acpi_attach(device_t parent,device_t self,void * aux)79 dwiic_acpi_attach(device_t parent, device_t self, void *aux)
80 {
81 struct dwiic_softc * const sc = device_private(self);
82 struct acpi_attach_args *aa = aux;
83 struct acpi_resources res;
84 struct acpi_mem *mem;
85 struct acpi_irq *irq;
86 ACPI_STATUS rv;
87 int error;
88 void *ih;
89
90 sc->sc_dev = self;
91 sc->sc_type = dwiic_type_generic;
92 sc->sc_iot = aa->aa_memt;
93
94 rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS",
95 &res, &acpi_resource_parse_ops_default);
96 if (ACPI_FAILURE(rv))
97 return;
98
99 mem = acpi_res_mem(&res, 0);
100 if (mem == NULL) {
101 aprint_error_dev(self, "couldn't find mem resource\n");
102 goto done;
103 }
104
105 irq = acpi_res_irq(&res, 0);
106 if (irq == NULL) {
107 aprint_error_dev(self, "couldn't find irq resource\n");
108 goto done;
109 }
110
111 error = bus_space_map(sc->sc_iot, mem->ar_base, mem->ar_length, 0, &sc->sc_ioh);
112 if (error) {
113 aprint_error_dev(self, "couldn't map registers\n");
114 return;
115 }
116
117 ih = acpi_intr_establish(self,
118 (uint64_t)(uintptr_t)aa->aa_node->ad_handle,
119 IPL_VM, true, dwiic_intr, sc, device_xname(self));
120 if (ih == NULL) {
121 aprint_error_dev(self, "couldn't install interrupt handler\n");
122 bus_space_unmap(sc->sc_iot, sc->sc_ioh, mem->ar_length);
123 goto done;
124 }
125
126 dwiic_acpi_configure(sc, aa->aa_node->ad_handle);
127
128 sc->sc_iba.iba_child_devices = acpi_enter_i2c_devs(self, aa->aa_node);
129
130 if (!dwiic_attach(sc))
131 goto done;
132
133 config_found(self, &sc->sc_iba, iicbus_print, CFARGS_NONE);
134
135 pmf_device_register(self, dwiic_suspend, dwiic_resume);
136
137 done:
138 acpi_resource_cleanup(&res);
139 }
140
141 static void
dwiic_acpi_parse_param(struct dwiic_softc * sc,ACPI_HANDLE handle,const char * path,struct dwiic_acpi_param * param)142 dwiic_acpi_parse_param(struct dwiic_softc *sc, ACPI_HANDLE handle, const char *path,
143 struct dwiic_acpi_param *param)
144 {
145 ACPI_BUFFER buf;
146 ACPI_OBJECT *obj;
147
148 memset(param, 0, sizeof(*param));
149
150 if (ACPI_FAILURE(acpi_eval_struct(handle, path, &buf)))
151 return;
152
153 obj = buf.Pointer;
154 if (obj->Type != ACPI_TYPE_PACKAGE || obj->Package.Count != 3)
155 goto done;
156
157 param->hcnt = (uint16_t)obj->Package.Elements[0].Integer.Value;
158 param->lcnt = (uint16_t)obj->Package.Elements[1].Integer.Value;
159 param->ht = (uint32_t)obj->Package.Elements[2].Integer.Value;
160
161 done:
162 ACPI_FREE(buf.Pointer);
163 }
164
165 static void
dwiic_acpi_configure(struct dwiic_softc * sc,ACPI_HANDLE handle)166 dwiic_acpi_configure(struct dwiic_softc *sc, ACPI_HANDLE handle)
167 {
168 struct dwiic_acpi_param sscn, fmcn;
169
170 dwiic_acpi_parse_param(sc, handle, "SSCN", &sscn);
171 sc->ss_hcnt = sscn.hcnt;
172 sc->ss_lcnt = sscn.lcnt;
173
174 dwiic_acpi_parse_param(sc, handle, "FMCN", &fmcn);
175 sc->fs_hcnt = fmcn.hcnt;
176 sc->fs_lcnt = fmcn.lcnt;
177
178 /* XXX */
179 sc->sda_hold_time = fmcn.ht;
180 }
181