dwiic_fdt.c revision 1.1 1 /* $NetBSD: dwiic_fdt.c,v 1.1 2018/09/26 19:06:33 jakllsch Exp $ */
2
3 /*-
4 * Copyright (c) 2017 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Manuel Bouyer.
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 * Synopsys DesignWare I2C controller, FDT front-end
33 */
34
35 #include <sys/cdefs.h>
36 __KERNEL_RCSID(0, "$NetBSD: dwiic_fdt.c,v 1.1 2018/09/26 19:06:33 jakllsch Exp $");
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40
41 #include <dev/fdt/fdtvar.h>
42 #include <dev/ic/dwiic_var.h>
43
44 static const char * const compatible[] = {
45 "snps,designware-i2c",
46 NULL
47 };
48
49 struct dwiic_fdt_softc {
50 struct dwiic_softc sc_dwiic;
51 };
52
53 static int dwiic_fdt_match(device_t, cfdata_t, void *);
54 static void dwiic_fdt_attach(device_t, device_t, void *);
55 static i2c_tag_t dwiic_fdt_i2c_get_tag(device_t);
56
57 struct fdtbus_i2c_controller_func dwiic_fdt_i2c_funcs = {
58 .get_tag = dwiic_fdt_i2c_get_tag,
59 };
60
61 CFATTACH_DECL_NEW(dwiic_fdt, sizeof(struct dwiic_fdt_softc),
62 dwiic_fdt_match, dwiic_fdt_attach, dwiic_detach, NULL);
63
64 int
65 dwiic_fdt_match(device_t parent, cfdata_t match, void *aux)
66 {
67 struct fdt_attach_args * const faa = aux;
68
69 return of_match_compatible(faa->faa_phandle, compatible);
70 }
71
72 void
73 dwiic_fdt_attach(device_t parent, device_t self, void *aux)
74 {
75 struct dwiic_fdt_softc * const sc = device_private(self);
76 struct fdt_attach_args * const faa = aux;
77 const int phandle = faa->faa_phandle;
78 bus_addr_t addr;
79 bus_size_t size;
80 char intrstr[128];
81
82 sc->sc_dwiic.sc_dev = self;
83 sc->sc_dwiic.sc_power = NULL;
84 sc->sc_dwiic.sc_type = dwiic_type_generic;
85
86 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
87 aprint_error(": couldn't get registers\n");
88 return;
89 }
90
91 sc->sc_dwiic.sc_iot = faa->faa_bst;
92 if (bus_space_map(sc->sc_dwiic.sc_iot, addr, size, 0, &sc->sc_dwiic.sc_ioh) != 0) {
93 aprint_error(": couldn't map registers\n");
94 return;
95 }
96
97 aprint_naive(": I2C controller\n");
98 aprint_normal(": I2C controller\n");
99
100 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
101 aprint_error_dev(self, "failed to decode interrupt\n");
102 return;
103 }
104 aprint_normal_dev(self, "interrupting on %s\n", intrstr);
105
106 sc->sc_dwiic.sc_ih = fdtbus_intr_establish(phandle, 0, IPL_VM, 0,
107 dwiic_intr, &sc->sc_dwiic);
108 if (sc->sc_dwiic.sc_ih == NULL) {
109 aprint_error_dev(self, "couldn't establish interrupt\n");
110 goto out;
111 }
112
113 dwiic_attach(&sc->sc_dwiic);
114
115 pmf_device_register(self, dwiic_suspend, dwiic_resume);
116
117 fdtbus_register_i2c_controller(self, phandle, &dwiic_fdt_i2c_funcs);
118
119 fdtbus_attach_i2cbus(self, phandle, &sc->sc_dwiic.sc_i2c_tag, iicbus_print);
120
121 out:
122 return;
123 }
124
125 static i2c_tag_t
126 dwiic_fdt_i2c_get_tag(device_t dev)
127 {
128 struct dwiic_fdt_softc * const sc = device_private(dev);
129
130 return &sc->sc_dwiic.sc_i2c_tag;
131 }
132