1/* $NetBSD: apc.c,v 1.2 2019/12/30 22:13:46 ad Exp $ */ 2 3/* 4 * Copyright (c) 2010 Manuel Bouyer. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__KERNEL_RCSID(0, "$NetBSD: apc.c,v 1.2 2019/12/30 22:13:46 ad Exp $"); 29 30 31/* 32 * driver for the power management functions of the Aurora Personality Chip 33 * on SPARCstation-4/5 and derivatives 34 */ 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/errno.h> 39#include <sys/device.h> 40#include <sys/bus.h> 41 42#include <machine/autoconf.h> 43 44#include <sparc/dev/apcreg.h> 45 46static int apcmatch(device_t, struct cfdata *, void *); 47static void apcattach(device_t, device_t, void *); 48static void apc_cpu_sleep(void); 49 50struct apc_softc { 51 device_t sc_dev; 52 bus_space_tag_t sc_bt; 53 bus_space_handle_t sc_bh; 54}; 55 56struct apc_softc *apc = NULL; 57 58CFATTACH_DECL_NEW(apc, sizeof(struct apc_softc), 59 apcmatch, apcattach, NULL, NULL); 60 61 62static int 63apcmatch(device_t parent, struct cfdata *cf, void *aux) 64{ 65 struct sbus_attach_args *sa = aux; 66 if (apc != NULL) /* only one instance */ 67 return 0; 68 return strcmp("power-management", sa->sa_name) == 0; 69} 70 71static void 72apcattach(device_t parent, device_t self, void *aux) 73{ 74 struct sbus_attach_args *sa = aux; 75 struct apc_softc *sc = device_private(self); 76 77 sc->sc_bt = sa->sa_bustag; 78 if (sbus_bus_map(sa->sa_bustag, 79 sa->sa_slot, sa->sa_offset, APC_REG_SIZE, 0, &sc->sc_bh) != 0) { 80 aprint_error(": cannot map registers\n"); 81 return; 82 } 83 aprint_normal("\n"); 84 apc = sc; 85 curcpu()->idlespin = apc_cpu_sleep; 86} 87 88static void 89apc_cpu_sleep(void) 90{ 91 uint8_t val; 92 if (apc == NULL) 93 return; 94 val = bus_space_read_1(apc->sc_bt, apc->sc_bh, APC_IDLE_REG); 95 bus_space_write_1(apc->sc_bt, apc->sc_bh, APC_IDLE_REG, 96 val | APC_IDLE_REG_IDLE); 97} 98