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
47struct dwiic_acpi_param {
48	uint16_t hcnt;
49	uint16_t lcnt;
50	uint32_t ht;
51};
52
53static int	dwiic_acpi_match(device_t, cfdata_t, void *);
54static void	dwiic_acpi_attach(device_t, device_t, void *);
55
56static void	dwiic_acpi_parse_param(struct dwiic_softc *, ACPI_HANDLE,
57					  const char *, struct dwiic_acpi_param *);
58static void	dwiic_acpi_configure(struct dwiic_softc *, ACPI_HANDLE);
59
60CFATTACH_DECL_NEW(dwiic_acpi, sizeof(struct dwiic_softc), dwiic_acpi_match, dwiic_acpi_attach, NULL, NULL);
61
62static 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
70static int
71dwiic_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
78static void
79dwiic_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
137done:
138	acpi_resource_cleanup(&res);
139}
140
141static void
142dwiic_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
161done:
162	ACPI_FREE(buf.Pointer);
163}
164
165static void
166dwiic_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