nxpiic_acpi.c revision 1.6 
1/* $NetBSD: nxpiic_acpi.c,v 1.6 2025/09/15 15:18:42 thorpej Exp $ */
2
3/*-
4 * Copyright (c) 2021 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: nxpiic_acpi.c,v 1.6 2025/09/15 15:18:42 thorpej 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/i2c/motoi2cvar.h>
46#include <dev/i2c/motoi2creg.h>
47
48#define	NXPIIC_SPEED_STD	100000
49
50static const struct clk_div {
51	int scl_div;
52	uint8_t ibc;
53} nxpiic_clk_div[] = {
54	{ 20, 0x00 },	{ 22, 0x01 },	{ 24, 0x02 },	{ 26, 0x03 },
55	{ 28, 0x04 },	{ 30, 0x05 },	{ 32, 0x09 },	{ 34, 0x06 },
56	{ 36, 0x0a },	{ 40, 0x07 },	{ 44, 0x0c },	{ 48, 0x0d },
57	{ 52, 0x43 },	{ 56, 0x0e },	{ 60, 0x45 },	{ 64, 0x12 },
58	{ 68, 0x0f },	{ 72, 0x13 },	{ 80, 0x14 },	{ 88, 0x15 },
59	{ 96, 0x19 },	{ 104, 0x16 },	{ 112, 0x1a },	{ 128, 0x17 },
60	{ 136, 0x4f },	{ 144, 0x1c },	{ 160, 0x1d },	{ 176, 0x55 },
61	{ 192, 0x1e },	{ 208, 0x56 },	{ 224, 0x22 },	{ 228, 0x24 },
62	{ 240, 0x1f },	{ 256, 0x23 },	{ 288, 0x5c },	{ 320, 0x25 },
63	{ 384, 0x26 },	{ 448, 0x2a },	{ 480, 0x27 },	{ 512, 0x2b },
64	{ 576, 0x2c },	{ 640, 0x2d },	{ 768, 0x31 },	{ 896, 0x32 },
65	{ 960, 0x2f },	{ 1024, 0x33 },	{ 1152, 0x34 },	{ 1280, 0x35 },
66	{ 1536, 0x36 },	{ 1792, 0x3a },	{ 1920, 0x37 },	{ 2048, 0x3b },
67	{ 2304, 0x3c },	{ 2560, 0x3d },	{ 3072, 0x3e },	{ 3584, 0x7a },
68	{ 3840, 0x3f },	{ 4096, 0x7B },	{ 5120, 0x7d },	{ 6144, 0x7e },
69};
70
71static int	nxpiic_acpi_match(device_t, cfdata_t, void *);
72static void	nxpiic_acpi_attach(device_t, device_t, void *);
73
74static uint8_t	nxpiic_acpi_iord(struct motoi2c_softc *, bus_size_t);
75static void	nxpiic_acpi_iowr(struct motoi2c_softc *, bus_size_t, uint8_t);
76
77CFATTACH_DECL_NEW(nxpiic_acpi, sizeof(struct motoi2c_softc),
78    nxpiic_acpi_match, nxpiic_acpi_attach, NULL, NULL);
79
80static const struct device_compatible_entry compat_data[] = {
81	{ .compat = "NXP0001" },
82	DEVICE_COMPAT_EOL
83};
84
85static int
86nxpiic_acpi_match(device_t parent, cfdata_t cf, void *aux)
87{
88	struct acpi_attach_args *aa = aux;
89
90	return acpi_compatible_match(aa, compat_data);
91}
92
93static void
94nxpiic_acpi_attach(device_t parent, device_t self, void *aux)
95{
96	struct motoi2c_softc * const sc = device_private(self);
97	struct motoi2c_settings settings;
98	struct acpi_attach_args *aa = aux;
99	struct acpi_resources res;
100	struct acpi_mem *mem;
101	ACPI_INTEGER clock_freq;
102	ACPI_STATUS rv;
103	int error, n;
104
105	sc->sc_dev = self;
106	sc->sc_iot = aa->aa_memt;
107
108	rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS",
109	    &res, &acpi_resource_parse_ops_default);
110	if (ACPI_FAILURE(rv))
111		return;
112
113	mem = acpi_res_mem(&res, 0);
114	if (mem == NULL) {
115		aprint_error_dev(self, "couldn't find mem resource\n");
116		goto done;
117	}
118
119	rv = acpi_dsd_integer(aa->aa_node->ad_handle, "clock-frequency",
120	    &clock_freq);
121	if (ACPI_FAILURE(rv) || clock_freq == 0) {
122		aprint_error_dev(self, "couldn't get clock frequency\n");
123		goto done;
124	}
125	aprint_debug_dev(self, "bus clock %u Hz\n", (u_int)clock_freq);
126
127	error = bus_space_map(sc->sc_iot, mem->ar_base, mem->ar_length, 0,
128	    &sc->sc_ioh);
129	if (error) {
130		aprint_error_dev(self, "couldn't map registers\n");
131		return;
132	}
133
134	settings.i2c_adr = MOTOI2C_ADR_DEFAULT;
135	settings.i2c_dfsrr = MOTOI2C_DFSRR_DEFAULT;
136	for (n = 0; n < __arraycount(nxpiic_clk_div) - 1; n++) {
137		if (clock_freq / nxpiic_clk_div[n].scl_div < NXPIIC_SPEED_STD)
138			break;
139	}
140	settings.i2c_fdr = nxpiic_clk_div[n].ibc;
141
142	sc->sc_flags |= MOTOI2C_F_ENABLE_INV | MOTOI2C_F_STATUS_W1C;
143	sc->sc_iord = nxpiic_acpi_iord;
144	sc->sc_iowr = nxpiic_acpi_iowr;
145
146	motoi2c_attach(sc, &settings);
147
148done:
149	acpi_resource_cleanup(&res);
150
151}
152
153static uint8_t
154nxpiic_acpi_iord(struct motoi2c_softc *msc, bus_size_t off)
155{
156	KASSERT((off & 3) == 0);
157
158	if (off >= I2CDFSRR)
159		return 0;
160
161	return bus_space_read_1(msc->sc_iot, msc->sc_ioh, off >> 2);
162}
163
164static void
165nxpiic_acpi_iowr(struct motoi2c_softc *msc, bus_size_t off, uint8_t val)
166{
167	KASSERT((off & 3) == 0);
168
169	if (off >= I2CDFSRR)
170		return;
171
172	bus_space_write_1(msc->sc_iot, msc->sc_ioh, off >> 2, val);
173}
174