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 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 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 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