bcm2835_com.c revision 1.2 
1/* $NetBSD: bcm2835_com.c,v 1.2 2017/07/31 00:51:20 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2017 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: bcm2835_com.c,v 1.2 2017/07/31 00:51:20 jmcneill Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/intr.h>
36#include <sys/systm.h>
37#include <sys/termios.h>
38
39#include <arm/broadcom/bcm_amba.h>
40#include <arm/broadcom/bcm2835reg.h>
41#include <arm/broadcom/bcm2835var.h>
42#include <arm/broadcom/bcm2835_intr.h>
43
44#include <dev/ic/comvar.h>
45
46static int	bcm_com_match(device_t, cfdata_t, void *);
47static void	bcm_com_attach(device_t, device_t, void *);
48
49CFATTACH_DECL_NEW(bcmcom, sizeof(struct com_softc),
50	bcm_com_match, bcm_com_attach, NULL, NULL);
51
52static int
53bcm_com_match(device_t parent, cfdata_t cf, void *aux)
54{
55	struct amba_attach_args *aaa = aux;
56
57	return strcmp(aaa->aaa_name, "com") == 0;
58}
59
60static void
61bcm_com_attach(device_t parent, device_t self, void *aux)
62{
63	struct com_softc * const sc = device_private(self);
64	struct amba_attach_args * const aaa = aux;
65	const prop_dictionary_t dict = device_properties(self);
66	bus_space_tag_t bst = &bcm2835_a4x_bs_tag;
67	bus_space_handle_t bsh;
68	void *ih;
69
70	sc->sc_dev = self;
71	sc->sc_type = COM_TYPE_BCMAUXUART;
72
73	prop_dictionary_get_uint32(dict, "frequency", &sc->sc_frequency);
74	if (sc->sc_frequency == 0) {
75		aprint_error(": couldn't get frequency\n");
76		return;
77	}
78	sc->sc_frequency *= 2;
79
80	if (bus_space_map(bst, aaa->aaa_addr, aaa->aaa_size, 0, &bsh) != 0) {
81		aprint_error(": can't map device\n");
82		return;
83	}
84
85	COM_INIT_REGS(sc->sc_regs, bst, bsh, aaa->aaa_addr);
86
87	com_attach_subr(sc);
88	aprint_naive("\n");
89
90	ih = intr_establish(aaa->aaa_intr, IPL_SERIAL, IST_LEVEL, comintr, sc);
91	if (ih == NULL) {
92		aprint_error_dev(self, "failed to establish interrupt %d\n",
93		    aaa->aaa_intr);
94		return;
95	}
96	aprint_normal_dev(self, "interrupting on intr %d\n", aaa->aaa_intr);
97}
98