bcm2835_bsc_fdt.c revision 1.4 
1/*	$NetBSD: bcm2835_bsc_fdt.c,v 1.4 2020/12/23 16:02:11 thorpej 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 1.4 2020/12/23 16:02:11 thorpej 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
49static int bsciic_fdt_match(device_t, cfdata_t, void *);
50static void bsciic_fdt_attach(device_t, device_t, void *);
51
52CFATTACH_DECL_NEW(bsciic_fdt, sizeof(struct bsciic_softc),
53    bsciic_fdt_match, bsciic_fdt_attach, NULL, NULL);
54
55static int
56bsciic_fdt_match(device_t parent, cfdata_t match, void *aux)
57{
58	const char * const compatible[] = { "brcm,bcm2835-i2c", NULL };
59	struct fdt_attach_args * const faa = aux;
60
61	return of_match_compatible(faa->faa_phandle, compatible);
62}
63
64static void
65bsciic_fdt_attach(device_t parent, device_t self, void *aux)
66{
67	struct bsciic_softc * const sc = device_private(self);
68	struct fdt_attach_args * const faa = aux;
69	const int phandle = faa->faa_phandle;
70
71	bus_addr_t addr;
72	bus_size_t size;
73
74	sc->sc_dev = self;
75	sc->sc_iot = faa->faa_bst;
76
77	int error = fdtbus_get_reg(phandle, 0, &addr, &size);
78	if (error) {
79		aprint_error(": unable to get device registers\n");
80		return;
81	}
82
83	/* Enable clock */
84	sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
85	if (sc->sc_clk == NULL) {
86		aprint_error(": couldn't acquire clock\n");
87		return;
88	}
89
90	if (clk_enable(sc->sc_clk) != 0) {
91		aprint_error(": failed to enable clock\n");
92		return;
93	}
94
95	sc->sc_frequency = clk_get_rate(sc->sc_clk);
96
97	if (of_getprop_uint32(phandle, "clock-frequency",
98	    &sc->sc_clkrate) != 0) {
99		sc->sc_clkrate = 100000;
100	}
101
102	if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh)) {
103		aprint_error(": unable to map device\n");
104		return;
105	}
106
107	aprint_naive("\n");
108	aprint_normal(": Broadcom Serial Controller\n");
109
110	bsciic_attach(sc);
111
112	char intrstr[128];
113	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
114		aprint_error_dev(sc->sc_dev, "failed to decode interrupt\n");
115		return;
116	}
117	sc->sc_inth = fdtbus_intr_establish(phandle, 0, IPL_VM,
118	    FDT_INTR_MPSAFE, bsciic_intr, sc);
119	if (sc->sc_inth == NULL) {
120		aprint_error_dev(sc->sc_dev,
121		    "failed to establish interrupt %s\n", intrstr);
122		return;
123	}
124	aprint_normal_dev(sc->sc_dev, "interrupting on %s\n", intrstr);
125
126	iic_tag_init(&sc->sc_i2c);
127	sc->sc_i2c.ic_cookie = sc;
128	sc->sc_i2c.ic_acquire_bus = bsciic_acquire_bus;
129	sc->sc_i2c.ic_release_bus = bsciic_release_bus;
130	sc->sc_i2c.ic_exec = bsciic_exec;
131
132	fdtbus_register_i2c_controller(&sc->sc_i2c, phandle);
133
134	fdtbus_attach_i2cbus(self, phandle, &sc->sc_i2c, iicbus_print);
135}
136