121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
/* $NetBSD: virtctrl.c,v 1.2 2024/01/06 21:49:59 thorpej Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2024 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Jason R. Thorpe.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: virtctrl.c,v 1.2 2024/01/06 21:49:59 thorpej Exp $");
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/device.h>
|
|
#include <sys/reboot.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <machine/cpu.h>
|
|
|
|
#include <virt68k/dev/mainbusvar.h>
|
|
|
|
struct virtctrl_softc {
|
|
device_t sc_dev;
|
|
bus_space_tag_t sc_bst;
|
|
bus_space_handle_t sc_bsh;
|
|
};
|
|
|
|
static const struct device_compatible_entry compat_data[] = {
|
|
{ .compat = "netbsd,qemu-virt-ctrl" },
|
|
DEVICE_COMPAT_EOL
|
|
};
|
|
|
|
#define VIRTCTRL_REG_FEATURES 0x00
|
|
#define VIRTCTRL_REG_CMD 0x04
|
|
|
|
#define CMD_NOP 0
|
|
#define CMD_RESET 1
|
|
#define CMD_HALT 2
|
|
#define CMD_PANIC 3
|
|
|
|
#define REG_READ(sc, r) \
|
|
bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (r))
|
|
#define REG_WRITE(sc, r, v) \
|
|
bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (r), (v))
|
|
|
|
static void
|
|
virtctrl_reset_handler(void *v, int howto)
|
|
{
|
|
struct virtctrl_softc * const sc = v;
|
|
|
|
if (panicstr != NULL) {
|
|
/*
|
|
* XXX N.B. This forces a shutdown, rather than
|
|
* XXX a reboot.
|
|
*/
|
|
REG_WRITE(sc, VIRTCTRL_REG_CMD, CMD_PANIC);
|
|
} else if (howto & RB_HALT) {
|
|
REG_WRITE(sc, VIRTCTRL_REG_CMD, CMD_HALT);
|
|
} else {
|
|
REG_WRITE(sc, VIRTCTRL_REG_CMD, CMD_RESET);
|
|
}
|
|
}
|
|
|
|
static int
|
|
virtctrl_match(device_t parent, cfdata_t cf, void *aux)
|
|
{
|
|
struct mainbus_attach_args * const ma = aux;
|
|
|
|
return mainbus_compatible_match(ma, compat_data);
|
|
}
|
|
|
|
static void
|
|
virtctrl_attach(device_t parent, device_t self, void *aux)
|
|
{
|
|
struct virtctrl_softc * const sc = device_private(self);
|
|
struct mainbus_attach_args * const ma = aux;
|
|
uint32_t feat;
|
|
|
|
sc->sc_dev = self;
|
|
sc->sc_bst = ma->ma_st;
|
|
if (bus_space_map(sc->sc_bst, ma->ma_addr, ma->ma_size, 0,
|
|
&sc->sc_bsh) != 0) {
|
|
aprint_error(": couldn't map registers\n");
|
|
return;
|
|
}
|
|
|
|
aprint_naive("\n");
|
|
aprint_normal(": Qemu Virtual System Controller\n");
|
|
|
|
feat = REG_READ(sc, VIRTCTRL_REG_FEATURES);
|
|
aprint_normal_dev(self, "features=0x%08x\n", feat);
|
|
|
|
cpu_set_reset_func(virtctrl_reset_handler, sc);
|
|
}
|
|
|
|
CFATTACH_DECL_NEW(virtctrl, sizeof(struct virtctrl_softc),
|
|
virtctrl_match, virtctrl_attach, NULL, NULL);
|