1/* $NetBSD: virtio_mainbus.c,v 1.4 2021/11/03 07:53:56 skrll Exp $ */
2
3/*
4 * Copyright (c) 2021 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Reinoud Zandijk
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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: virtio_mainbus.c,v 1.4 2021/11/03 07:53:56 skrll Exp $");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37
38#include <sys/device.h>
39#include <evbmips/mipssim/autoconf.h>
40#include <evbmips/mipssim/mipssimreg.h>
41
42#define VIRTIO_PRIVATE
43#include <dev/virtio/virtio_mmiovar.h>
44
45
46static int	virtio_mainbus_match(device_t, cfdata_t, void *);
47static void	virtio_mainbus_attach(device_t, device_t, void *);
48static int	virtio_mainbus_rescan(device_t, const char *, const int *);
49static int	virtio_mainbus_detach(device_t, int);
50
51static int	virtio_mainbus_alloc_interrupts(struct virtio_mmio_softc *);
52static void	virtio_mainbus_free_interrupts(struct virtio_mmio_softc *);
53
54struct virtio_mainbus_softc {
55	struct virtio_mmio_softc sc_msc;
56
57	int		 sc_irq;
58	void		*sc_ih;
59};
60
61
62CFATTACH_DECL3_NEW(virtio_mainbus, sizeof(struct virtio_mainbus_softc),
63    virtio_mainbus_match, virtio_mainbus_attach,
64    virtio_mainbus_detach, NULL,
65    virtio_mainbus_rescan, (void *)voidop, DVF_DETACH_SHUTDOWN);
66
67
68static int
69virtio_mainbus_match(device_t parent, cfdata_t match, void *aux)
70{
71	struct mainbus_attach_args *ma = aux;
72
73	/* TODO can we check here if its present? */
74	if (strcmp(ma->ma_name, match->cf_name) == 0)
75		return (1<<1);
76
77	return (0);
78}
79
80
81void
82virtio_mainbus_attach(device_t parent, device_t self, void *aux)
83{
84	struct virtio_mainbus_softc *sc = device_private(self);
85	struct virtio_mmio_softc *msc = &sc->sc_msc;
86	struct virtio_softc *vsc = &msc->sc_sc;
87	struct mainbus_attach_args *ma = aux;
88	bus_space_handle_t ioh;
89
90	if (bus_space_map(ma->ma_iot, ma->ma_addr, VIRTIO_STRIDE, 0, &ioh) != 0) {
91		aprint_error(": can't map i/o space\n");
92		return;
93	}
94
95	aprint_normal("\n");
96	aprint_naive("\n");
97
98	sc->sc_irq = ma->ma_irq;
99
100	msc->sc_iot = ma->ma_iot;
101	msc->sc_ioh = ioh;
102	msc->sc_iosize = VIRTIO_STRIDE;
103	msc->sc_alloc_interrupts = virtio_mainbus_alloc_interrupts;
104	msc->sc_free_interrupts  = virtio_mainbus_free_interrupts;
105
106	vsc->sc_dev = self;
107	vsc->sc_dmat = ma->ma_dmat;
108	if (virtio_mmio_common_probe_present(msc))
109		virtio_mmio_common_attach(msc);
110
111	virtio_mainbus_rescan(self, NULL, NULL);
112}
113
114
115/* ARGSUSED */
116static int
117virtio_mainbus_rescan(device_t self, const char *ifattr, const int *locs)
118{
119	struct virtio_mainbus_softc *sc = device_private(self);
120	struct virtio_mmio_softc *msc = &sc->sc_msc;
121	struct virtio_softc *vsc = &msc->sc_sc;
122	struct virtio_attach_args va;
123
124	if (vsc->sc_child)	/* child already attached? */
125		return 0;
126
127	memset(&va, 0, sizeof(va));
128	va.sc_childdevid = vsc->sc_childdevid;
129
130	config_found(self, &va, NULL, CFARGS_NONE);
131
132	if (virtio_attach_failed(vsc))
133		return 0;
134	return 0;
135}
136
137
138static int
139virtio_mainbus_detach(device_t self, int flags)
140{
141	struct virtio_mainbus_softc *sc = device_private(self);
142	struct virtio_mmio_softc * const msc = &sc->sc_msc;
143
144	return virtio_mmio_common_detach(msc, flags);
145}
146
147
148static int
149virtio_mainbus_alloc_interrupts(struct virtio_mmio_softc *msc)
150{
151	struct virtio_mainbus_softc *sc = (struct virtio_mainbus_softc *) msc;
152	struct virtio_softc * const vsc = &msc->sc_sc;
153
154	msc->sc_ih = evbmips_intr_establish(sc->sc_irq, virtio_mmio_intr,
155		msc);
156	if (msc->sc_ih == NULL) {
157		aprint_error_dev(vsc->sc_dev,
158			"couldn't install interrupt handler\n");
159		return -1;
160	}
161
162	aprint_normal_dev(vsc->sc_dev, "interrupting at irq %d\n", sc->sc_irq);
163
164	return 0;
165}
166
167
168static void
169virtio_mainbus_free_interrupts(struct virtio_mmio_softc *msc)
170{
171	panic("%s not implemented\n", __func__);
172}
173