1 /* $NetBSD: virtctrl.c,v 1.2 2024/01/06 21:49:59 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2024 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
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: virtctrl.c,v 1.2 2024/01/06 21:49:59 thorpej Exp $");
34
35 #include <sys/types.h>
36 #include <sys/bus.h>
37 #include <sys/device.h>
38 #include <sys/reboot.h>
39 #include <sys/systm.h>
40
41 #include <machine/cpu.h>
42
43 #include <virt68k/dev/mainbusvar.h>
44
45 struct virtctrl_softc {
46 device_t sc_dev;
47 bus_space_tag_t sc_bst;
48 bus_space_handle_t sc_bsh;
49 };
50
51 static const struct device_compatible_entry compat_data[] = {
52 { .compat = "netbsd,qemu-virt-ctrl" },
53 DEVICE_COMPAT_EOL
54 };
55
56 #define VIRTCTRL_REG_FEATURES 0x00
57 #define VIRTCTRL_REG_CMD 0x04
58
59 #define CMD_NOP 0
60 #define CMD_RESET 1
61 #define CMD_HALT 2
62 #define CMD_PANIC 3
63
64 #define REG_READ(sc, r) \
65 bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (r))
66 #define REG_WRITE(sc, r, v) \
67 bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (r), (v))
68
69 static void
virtctrl_reset_handler(void * v,int howto)70 virtctrl_reset_handler(void *v, int howto)
71 {
72 struct virtctrl_softc * const sc = v;
73
74 if (panicstr != NULL) {
75 /*
76 * XXX N.B. This forces a shutdown, rather than
77 * XXX a reboot.
78 */
79 REG_WRITE(sc, VIRTCTRL_REG_CMD, CMD_PANIC);
80 } else if (howto & RB_HALT) {
81 REG_WRITE(sc, VIRTCTRL_REG_CMD, CMD_HALT);
82 } else {
83 REG_WRITE(sc, VIRTCTRL_REG_CMD, CMD_RESET);
84 }
85 }
86
87 static int
virtctrl_match(device_t parent,cfdata_t cf,void * aux)88 virtctrl_match(device_t parent, cfdata_t cf, void *aux)
89 {
90 struct mainbus_attach_args * const ma = aux;
91
92 return mainbus_compatible_match(ma, compat_data);
93 }
94
95 static void
virtctrl_attach(device_t parent,device_t self,void * aux)96 virtctrl_attach(device_t parent, device_t self, void *aux)
97 {
98 struct virtctrl_softc * const sc = device_private(self);
99 struct mainbus_attach_args * const ma = aux;
100 uint32_t feat;
101
102 sc->sc_dev = self;
103 sc->sc_bst = ma->ma_st;
104 if (bus_space_map(sc->sc_bst, ma->ma_addr, ma->ma_size, 0,
105 &sc->sc_bsh) != 0) {
106 aprint_error(": couldn't map registers\n");
107 return;
108 }
109
110 aprint_naive("\n");
111 aprint_normal(": Qemu Virtual System Controller\n");
112
113 feat = REG_READ(sc, VIRTCTRL_REG_FEATURES);
114 aprint_normal_dev(self, "features=0x%08x\n", feat);
115
116 cpu_set_reset_func(virtctrl_reset_handler, sc);
117 }
118
119 CFATTACH_DECL_NEW(virtctrl, sizeof(struct virtctrl_softc),
120 virtctrl_match, virtctrl_attach, NULL, NULL);
121