1 /* $NetBSD: cdnsiic_fdt.c,v 1.1 2022/11/05 17:31:37 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2022 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30
31 __KERNEL_RCSID(0, "$NetBSD: cdnsiic_fdt.c,v 1.1 2022/11/05 17:31:37 jmcneill Exp $");
32
33 #include <sys/param.h>
34 #include <sys/bus.h>
35 #include <sys/device.h>
36 #include <sys/intr.h>
37 #include <sys/systm.h>
38 #include <sys/time.h>
39 #include <sys/kmem.h>
40
41 #include <dev/i2c/i2cvar.h>
42
43 #include <dev/fdt/fdtvar.h>
44 #include <dev/ic/cdnsiicvar.h>
45
46 static const struct device_compatible_entry compat_data[] = {
47 { .compat = "cdns,i2c-r1p10" },
48 { .compat = "cdns,i2c-r1p14" },
49 DEVICE_COMPAT_EOL
50 };
51
52 static int
cdnsiic_fdt_match(device_t parent,cfdata_t cf,void * aux)53 cdnsiic_fdt_match(device_t parent, cfdata_t cf, void *aux)
54 {
55 struct fdt_attach_args * const faa = aux;
56
57 return of_compatible_match(faa->faa_phandle, compat_data);
58 }
59
60 static void
cdnsiic_fdt_attach(device_t parent,device_t self,void * aux)61 cdnsiic_fdt_attach(device_t parent, device_t self, void *aux)
62 {
63 struct cdnsiic_softc * const sc = device_private(self);
64 struct fdt_attach_args * const faa = aux;
65 const int phandle = faa->faa_phandle;
66 bus_addr_t addr;
67 bus_size_t size;
68 int error;
69
70 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
71 aprint_error(": couldn't get registers\n");
72 return;
73 }
74
75 sc->sc_pclk = fdtbus_clock_get_index(phandle, 0);
76 if (sc->sc_pclk == NULL || clk_enable(sc->sc_pclk) != 0) {
77 aprint_error(": couldn't enable pclk\n");
78 return;
79 }
80
81 if (of_getprop_uint32(phandle, "clock-frequency", &sc->sc_bus_freq))
82 sc->sc_bus_freq = 100000;
83
84 sc->sc_dev = self;
85 sc->sc_bst = faa->faa_bst;
86 if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
87 aprint_error(": couldn't map registers\n");
88 return;
89 }
90
91 error = cdnsiic_attach(sc);
92 if (error != 0) {
93 aprint_error_dev(self, "init failed, error = %d\n", error);
94 return;
95 }
96
97 fdtbus_register_i2c_controller(&sc->sc_ic, phandle);
98
99 fdtbus_attach_i2cbus(self, phandle, &sc->sc_ic, iicbus_print);
100 }
101
102 CFATTACH_DECL_NEW(cdnsiic_fdt, sizeof(struct cdnsiic_softc),
103 cdnsiic_fdt_match, cdnsiic_fdt_attach, NULL, NULL);
104