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
46 static int virtio_mainbus_match(device_t, cfdata_t, void *);
47 static void virtio_mainbus_attach(device_t, device_t, void *);
48 static int virtio_mainbus_rescan(device_t, const char *, const int *);
49 static int virtio_mainbus_detach(device_t, int);
50
51 static int virtio_mainbus_alloc_interrupts(struct virtio_mmio_softc *);
52 static void virtio_mainbus_free_interrupts(struct virtio_mmio_softc *);
53
54 struct virtio_mainbus_softc {
55 struct virtio_mmio_softc sc_msc;
56
57 int sc_irq;
58 void *sc_ih;
59 };
60
61
62 CFATTACH_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
68 static int
virtio_mainbus_match(device_t parent,cfdata_t match,void * aux)69 virtio_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
81 void
virtio_mainbus_attach(device_t parent,device_t self,void * aux)82 virtio_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 */
116 static int
virtio_mainbus_rescan(device_t self,const char * ifattr,const int * locs)117 virtio_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
138 static int
virtio_mainbus_detach(device_t self,int flags)139 virtio_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
148 static int
virtio_mainbus_alloc_interrupts(struct virtio_mmio_softc * msc)149 virtio_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
168 static void
virtio_mainbus_free_interrupts(struct virtio_mmio_softc * msc)169 virtio_mainbus_free_interrupts(struct virtio_mmio_softc *msc)
170 {
171 panic("%s not implemented\n", __func__);
172 }
173