1*1f20ceebSthorpej /* $NetBSD: virtctrl.c,v 1.2 2024/01/06 21:49:59 thorpej Exp $ */
2d6ca6cc5Sthorpej
3d6ca6cc5Sthorpej /*-
4d6ca6cc5Sthorpej * Copyright (c) 2024 The NetBSD Foundation, Inc.
5d6ca6cc5Sthorpej * All rights reserved.
6d6ca6cc5Sthorpej *
7d6ca6cc5Sthorpej * This code is derived from software contributed to The NetBSD Foundation
8d6ca6cc5Sthorpej * by Jason R. Thorpe.
9d6ca6cc5Sthorpej *
10d6ca6cc5Sthorpej * Redistribution and use in source and binary forms, with or without
11d6ca6cc5Sthorpej * modification, are permitted provided that the following conditions
12d6ca6cc5Sthorpej * are met:
13d6ca6cc5Sthorpej * 1. Redistributions of source code must retain the above copyright
14d6ca6cc5Sthorpej * notice, this list of conditions and the following disclaimer.
15d6ca6cc5Sthorpej * 2. Redistributions in binary form must reproduce the above copyright
16d6ca6cc5Sthorpej * notice, this list of conditions and the following disclaimer in the
17d6ca6cc5Sthorpej * documentation and/or other materials provided with the distribution.
18d6ca6cc5Sthorpej *
19d6ca6cc5Sthorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20d6ca6cc5Sthorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21d6ca6cc5Sthorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22d6ca6cc5Sthorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23d6ca6cc5Sthorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24d6ca6cc5Sthorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25d6ca6cc5Sthorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26d6ca6cc5Sthorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27d6ca6cc5Sthorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28d6ca6cc5Sthorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29d6ca6cc5Sthorpej * POSSIBILITY OF SUCH DAMAGE.
30d6ca6cc5Sthorpej */
31d6ca6cc5Sthorpej
32d6ca6cc5Sthorpej #include <sys/cdefs.h>
33*1f20ceebSthorpej __KERNEL_RCSID(0, "$NetBSD: virtctrl.c,v 1.2 2024/01/06 21:49:59 thorpej Exp $");
34d6ca6cc5Sthorpej
35d6ca6cc5Sthorpej #include <sys/types.h>
36d6ca6cc5Sthorpej #include <sys/bus.h>
37d6ca6cc5Sthorpej #include <sys/device.h>
38d6ca6cc5Sthorpej #include <sys/reboot.h>
39d6ca6cc5Sthorpej #include <sys/systm.h>
40d6ca6cc5Sthorpej
41d6ca6cc5Sthorpej #include <machine/cpu.h>
42d6ca6cc5Sthorpej
43d6ca6cc5Sthorpej #include <virt68k/dev/mainbusvar.h>
44d6ca6cc5Sthorpej
45d6ca6cc5Sthorpej struct virtctrl_softc {
46d6ca6cc5Sthorpej device_t sc_dev;
47d6ca6cc5Sthorpej bus_space_tag_t sc_bst;
48d6ca6cc5Sthorpej bus_space_handle_t sc_bsh;
49d6ca6cc5Sthorpej };
50d6ca6cc5Sthorpej
51d6ca6cc5Sthorpej static const struct device_compatible_entry compat_data[] = {
52d6ca6cc5Sthorpej { .compat = "netbsd,qemu-virt-ctrl" },
53d6ca6cc5Sthorpej DEVICE_COMPAT_EOL
54d6ca6cc5Sthorpej };
55d6ca6cc5Sthorpej
56d6ca6cc5Sthorpej #define VIRTCTRL_REG_FEATURES 0x00
57d6ca6cc5Sthorpej #define VIRTCTRL_REG_CMD 0x04
58d6ca6cc5Sthorpej
59d6ca6cc5Sthorpej #define CMD_NOP 0
60d6ca6cc5Sthorpej #define CMD_RESET 1
61d6ca6cc5Sthorpej #define CMD_HALT 2
62d6ca6cc5Sthorpej #define CMD_PANIC 3
63d6ca6cc5Sthorpej
64d6ca6cc5Sthorpej #define REG_READ(sc, r) \
65d6ca6cc5Sthorpej bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (r))
66d6ca6cc5Sthorpej #define REG_WRITE(sc, r, v) \
67*1f20ceebSthorpej bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (r), (v))
68d6ca6cc5Sthorpej
69d6ca6cc5Sthorpej static void
virtctrl_reset_handler(void * v,int howto)70d6ca6cc5Sthorpej virtctrl_reset_handler(void *v, int howto)
71d6ca6cc5Sthorpej {
72d6ca6cc5Sthorpej struct virtctrl_softc * const sc = v;
73d6ca6cc5Sthorpej
74d6ca6cc5Sthorpej if (panicstr != NULL) {
75d6ca6cc5Sthorpej /*
76d6ca6cc5Sthorpej * XXX N.B. This forces a shutdown, rather than
77d6ca6cc5Sthorpej * XXX a reboot.
78d6ca6cc5Sthorpej */
79d6ca6cc5Sthorpej REG_WRITE(sc, VIRTCTRL_REG_CMD, CMD_PANIC);
80d6ca6cc5Sthorpej } else if (howto & RB_HALT) {
81d6ca6cc5Sthorpej REG_WRITE(sc, VIRTCTRL_REG_CMD, CMD_HALT);
82d6ca6cc5Sthorpej } else {
83d6ca6cc5Sthorpej REG_WRITE(sc, VIRTCTRL_REG_CMD, CMD_RESET);
84d6ca6cc5Sthorpej }
85d6ca6cc5Sthorpej }
86d6ca6cc5Sthorpej
87d6ca6cc5Sthorpej static int
virtctrl_match(device_t parent,cfdata_t cf,void * aux)88d6ca6cc5Sthorpej virtctrl_match(device_t parent, cfdata_t cf, void *aux)
89d6ca6cc5Sthorpej {
90d6ca6cc5Sthorpej struct mainbus_attach_args * const ma = aux;
91d6ca6cc5Sthorpej
92d6ca6cc5Sthorpej return mainbus_compatible_match(ma, compat_data);
93d6ca6cc5Sthorpej }
94d6ca6cc5Sthorpej
95d6ca6cc5Sthorpej static void
virtctrl_attach(device_t parent,device_t self,void * aux)96d6ca6cc5Sthorpej virtctrl_attach(device_t parent, device_t self, void *aux)
97d6ca6cc5Sthorpej {
98d6ca6cc5Sthorpej struct virtctrl_softc * const sc = device_private(self);
99d6ca6cc5Sthorpej struct mainbus_attach_args * const ma = aux;
100d6ca6cc5Sthorpej uint32_t feat;
101d6ca6cc5Sthorpej
102d6ca6cc5Sthorpej sc->sc_dev = self;
103d6ca6cc5Sthorpej sc->sc_bst = ma->ma_st;
104d6ca6cc5Sthorpej if (bus_space_map(sc->sc_bst, ma->ma_addr, ma->ma_size, 0,
105d6ca6cc5Sthorpej &sc->sc_bsh) != 0) {
106d6ca6cc5Sthorpej aprint_error(": couldn't map registers\n");
107d6ca6cc5Sthorpej return;
108d6ca6cc5Sthorpej }
109d6ca6cc5Sthorpej
110d6ca6cc5Sthorpej aprint_naive("\n");
111d6ca6cc5Sthorpej aprint_normal(": Qemu Virtual System Controller\n");
112d6ca6cc5Sthorpej
113d6ca6cc5Sthorpej feat = REG_READ(sc, VIRTCTRL_REG_FEATURES);
114d6ca6cc5Sthorpej aprint_normal_dev(self, "features=0x%08x\n", feat);
115d6ca6cc5Sthorpej
116d6ca6cc5Sthorpej cpu_set_reset_func(virtctrl_reset_handler, sc);
117d6ca6cc5Sthorpej }
118d6ca6cc5Sthorpej
119d6ca6cc5Sthorpej CFATTACH_DECL_NEW(virtctrl, sizeof(struct virtctrl_softc),
120d6ca6cc5Sthorpej virtctrl_match, virtctrl_attach, NULL, NULL);
121