1 /* $NetBSD: nxpiic_acpi.c,v 1.5 2022/07/22 23:43:23 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 1.5 2022/07/22 23:43:23 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
50 static 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
71 static int nxpiic_acpi_match(device_t, cfdata_t, void *);
72 static void nxpiic_acpi_attach(device_t, device_t, void *);
73
74 static uint8_t nxpiic_acpi_iord(struct motoi2c_softc *, bus_size_t);
75 static void nxpiic_acpi_iowr(struct motoi2c_softc *, bus_size_t, uint8_t);
76
77 CFATTACH_DECL_NEW(nxpiic_acpi, sizeof(struct motoi2c_softc),
78 nxpiic_acpi_match, nxpiic_acpi_attach, NULL, NULL);
79
80 static const struct device_compatible_entry compat_data[] = {
81 { .compat = "NXP0001" },
82 DEVICE_COMPAT_EOL
83 };
84
85 static int
nxpiic_acpi_match(device_t parent,cfdata_t cf,void * aux)86 nxpiic_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
93 static void
nxpiic_acpi_attach(device_t parent,device_t self,void * aux)94 nxpiic_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 sc->sc_child_devices = acpi_enter_i2c_devs(self, aa->aa_node);
146
147 motoi2c_attach(sc, &settings);
148
149 done:
150 acpi_resource_cleanup(&res);
151
152 }
153
154 static uint8_t
nxpiic_acpi_iord(struct motoi2c_softc * msc,bus_size_t off)155 nxpiic_acpi_iord(struct motoi2c_softc *msc, bus_size_t off)
156 {
157 KASSERT((off & 3) == 0);
158
159 if (off >= I2CDFSRR)
160 return 0;
161
162 return bus_space_read_1(msc->sc_iot, msc->sc_ioh, off >> 2);
163 }
164
165 static void
nxpiic_acpi_iowr(struct motoi2c_softc * msc,bus_size_t off,uint8_t val)166 nxpiic_acpi_iowr(struct motoi2c_softc *msc, bus_size_t off, uint8_t val)
167 {
168 KASSERT((off & 3) == 0);
169
170 if (off >= I2CDFSRR)
171 return;
172
173 bus_space_write_1(msc->sc_iot, msc->sc_ioh, off >> 2, val);
174 }
175