1 /* $NetBSD: bcm2835_bsc_fdt.c,v 1.6 2021/01/29 14:11:14 skrll Exp $ */
2
3 /*
4 * Copyright (c) 2019 Jason R. Thorpe
5 * Copyright (c) 2012 Jonathan A. Kollasch
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
21 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __KERNEL_RCSID(0, "$NetBSD: bcm2835_bsc_fdt.c,v 1.6 2021/01/29 14:11:14 skrll Exp $");
32
33 #include <sys/param.h>
34 #include <sys/bus.h>
35 #include <sys/device.h>
36 #include <sys/kernhist.h>
37 #include <sys/intr.h>
38 #include <sys/mutex.h>
39 #include <sys/systm.h>
40
41 #include <dev/i2c/i2cvar.h>
42
43 #include <arm/broadcom/bcm2835reg.h>
44 #include <arm/broadcom/bcm2835_bscreg.h>
45 #include <arm/broadcom/bcm2835_bscvar.h>
46
47 #include <dev/fdt/fdtvar.h>
48
49 static int bsciic_fdt_match(device_t, cfdata_t, void *);
50 static void bsciic_fdt_attach(device_t, device_t, void *);
51
52 CFATTACH_DECL_NEW(bsciic_fdt, sizeof(struct bsciic_softc),
53 bsciic_fdt_match, bsciic_fdt_attach, NULL, NULL);
54
55 static const struct device_compatible_entry compat_data[] = {
56 { .compat = "brcm,bcm2835-i2c" },
57 DEVICE_COMPAT_EOL
58 };
59
60 static int
bsciic_fdt_match(device_t parent,cfdata_t match,void * aux)61 bsciic_fdt_match(device_t parent, cfdata_t match, void *aux)
62 {
63 struct fdt_attach_args * const faa = aux;
64
65 return of_compatible_match(faa->faa_phandle, compat_data);
66 }
67
68 static void
bsciic_fdt_attach(device_t parent,device_t self,void * aux)69 bsciic_fdt_attach(device_t parent, device_t self, void *aux)
70 {
71 struct bsciic_softc * const sc = device_private(self);
72 struct fdt_attach_args * const faa = aux;
73 const int phandle = faa->faa_phandle;
74
75 bus_addr_t addr;
76 bus_size_t size;
77
78 sc->sc_dev = self;
79 sc->sc_iot = faa->faa_bst;
80
81 int error = fdtbus_get_reg(phandle, 0, &addr, &size);
82 if (error) {
83 aprint_error(": unable to get device registers\n");
84 return;
85 }
86
87 /* Enable clock */
88 sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
89 if (sc->sc_clk == NULL) {
90 aprint_error(": couldn't acquire clock\n");
91 return;
92 }
93
94 if (clk_enable(sc->sc_clk) != 0) {
95 aprint_error(": failed to enable clock\n");
96 return;
97 }
98
99 sc->sc_frequency = clk_get_rate(sc->sc_clk);
100
101 if (of_getprop_uint32(phandle, "clock-frequency",
102 &sc->sc_clkrate) != 0) {
103 sc->sc_clkrate = 100000;
104 }
105
106 if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh)) {
107 aprint_error(": unable to map device\n");
108 return;
109 }
110
111 aprint_naive("\n");
112 aprint_normal(": Broadcom Serial Controller\n");
113
114 bsciic_attach(sc);
115
116 char intrstr[128];
117 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
118 aprint_error_dev(sc->sc_dev, "failed to decode interrupt\n");
119 return;
120 }
121 sc->sc_inth = fdtbus_intr_establish_xname(phandle, 0, IPL_VM,
122 FDT_INTR_MPSAFE, bsciic_intr, sc, device_xname(sc->sc_dev));
123 if (sc->sc_inth == NULL) {
124 aprint_error_dev(sc->sc_dev,
125 "failed to establish interrupt %s\n", intrstr);
126 return;
127 }
128 aprint_normal_dev(sc->sc_dev, "interrupting on %s\n", intrstr);
129
130 iic_tag_init(&sc->sc_i2c);
131 sc->sc_i2c.ic_cookie = sc;
132 sc->sc_i2c.ic_acquire_bus = bsciic_acquire_bus;
133 sc->sc_i2c.ic_release_bus = bsciic_release_bus;
134 sc->sc_i2c.ic_exec = bsciic_exec;
135
136 fdtbus_register_i2c_controller(&sc->sc_i2c, phandle);
137
138 fdtbus_attach_i2cbus(self, phandle, &sc->sc_i2c, iicbus_print);
139 }
140