plcom_acpi.c revision 1.1 
1/* $NetBSD: plcom_acpi.c,v 1.1 2018/10/12 22:20:04 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2018 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jared McNeill <jmcneill@invisible.ca>.
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#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: plcom_acpi.c,v 1.1 2018/10/12 22:20:04 jmcneill Exp $");
34
35#include <sys/param.h>
36#include <sys/bus.h>
37#include <sys/cpu.h>
38#include <sys/device.h>
39#include <sys/termios.h>
40
41#include <dev/acpi/acpireg.h>
42#include <dev/acpi/acpivar.h>
43
44#include <evbarm/dev/plcomreg.h>
45#include <evbarm/dev/plcomvar.h>
46
47static int	plcom_acpi_match(device_t, cfdata_t, void *);
48static void	plcom_acpi_attach(device_t, device_t, void *);
49
50CFATTACH_DECL_NEW(plcom_acpi, sizeof(struct plcom_softc), plcom_acpi_match, plcom_acpi_attach, NULL, NULL);
51
52static const char * const compatible[] = {
53	"ARMH0011",
54	NULL
55};
56
57static int
58plcom_acpi_match(device_t parent, cfdata_t cf, void *aux)
59{
60	struct acpi_attach_args *aa = aux;
61
62	if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE)
63		return 0;
64
65	return acpi_match_hid(aa->aa_node->ad_devinfo, compatible);
66}
67
68static void
69plcom_acpi_attach(device_t parent, device_t self, void *aux)
70{
71	struct plcom_softc * const sc = device_private(self);
72	struct acpi_attach_args *aa = aux;
73	struct acpi_resources res;
74	struct acpi_mem *mem;
75	struct acpi_irq *irq;
76	ACPI_STATUS rv;
77	void *ih;
78
79	sc->sc_dev = self;
80
81	rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS",
82	    &res, &acpi_resource_parse_ops_default);
83	if (ACPI_FAILURE(rv))
84		return;
85
86	mem = acpi_res_mem(&res, 0);
87	if (mem == NULL) {
88		aprint_error(": couldn't find mem resource\n");
89		goto done;
90	}
91
92	irq = acpi_res_irq(&res, 0);
93	if (irq == NULL) {
94		aprint_error(": couldn't find irq resource\n");
95		goto done;
96	}
97
98	sc->sc_hwflags = PLCOM_HW_TXFIFO_DISABLE;
99	sc->sc_swflags = 0;
100
101	sc->sc_pi.pi_type = PLCOM_TYPE_PL011;
102	sc->sc_pi.pi_flags = PLC_FLAG_32BIT_ACCESS;
103	sc->sc_pi.pi_iot = aa->aa_memt;
104	sc->sc_pi.pi_iobase = mem->ar_base;
105	if (bus_space_map(aa->aa_memt, mem->ar_base, mem->ar_length, 0, &sc->sc_pi.pi_ioh) != 0) {
106		aprint_error(": couldn't map registers\n");
107		goto done;
108	}
109
110	plcom_attach_subr(sc);
111
112	const int type = (irq->ar_type == ACPI_EDGE_SENSITIVE) ? IST_EDGE : IST_LEVEL;
113	ih = intr_establish(irq->ar_irq, IPL_SERIAL, type | IST_MPSAFE, plcomintr, sc);
114	if (ih == NULL) {
115		aprint_error_dev(self, "couldn't install interrupt handler\n");
116		return;
117	}
118
119done:
120	acpi_resource_cleanup(&res);
121}
122