mkclock.c revision 1.10
1/* $NetBSD: mkclock.c,v 1.10 2012/08/11 21:48:30 mrg Exp $ */ 2 3/* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 1994 Gordon W. Ross 7 * Copyright (c) 1993 Adam Glass 8 * Copyright (c) 1996 Paul Kranenburg 9 * Copyright (c) 1996 10 * The President and Fellows of Harvard College. All rights reserved. 11 * 12 * This software was developed by the Computer Systems Engineering group 13 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 14 * contributed to Berkeley. 15 * 16 * All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Harvard University. 19 * This product includes software developed by the University of 20 * California, Lawrence Berkeley Laboratory. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 26 * 1. Redistributions of source code must retain the above copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * This product includes software developed by the University of 34 * California, Berkeley and its contributors. 35 * This product includes software developed by Paul Kranenburg. 36 * This product includes software developed by Harvard University. 37 * 4. Neither the name of the University nor the names of its contributors 38 * may be used to endorse or promote products derived from this software 39 * without specific prior written permission. 40 * 41 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * @(#)clock.c 8.1 (Berkeley) 6/11/93 54 * 55 */ 56 57#include <sys/cdefs.h> 58__KERNEL_RCSID(0, "$NetBSD: mkclock.c,v 1.10 2012/08/11 21:48:30 mrg Exp $"); 59 60/* 61 * Clock driver for 'mkclock' - Mostek MK48Txx TOD clock. 62 */ 63 64#include <sys/param.h> 65#include <sys/kernel.h> 66#include <sys/device.h> 67#include <sys/proc.h> 68#include <sys/resourcevar.h> 69#include <sys/malloc.h> 70#include <sys/systm.h> 71 72#include <uvm/uvm_extern.h> 73 74#include <sys/bus.h> 75#include <machine/autoconf.h> 76#include <machine/eeprom.h> 77#include <machine/cpu.h> 78 79#include <dev/clock_subr.h> 80#include <dev/ic/mk48txxreg.h> 81#include <dev/ic/mk48txxvar.h> 82 83#include <dev/sbus/sbusvar.h> 84#include <dev/ebus/ebusreg.h> 85#include <dev/ebus/ebusvar.h> 86 87#include <sparc64/dev/fhcvar.h> 88 89/* 90 * clock (eeprom) attaches at the sbus or the ebus (PCI) 91 */ 92static int mkclock_sbus_match(device_t, cfdata_t, void *); 93static void mkclock_sbus_attach(device_t, device_t, void *); 94 95static int mkclock_ebus_match(device_t, cfdata_t, void *); 96static void mkclock_ebus_attach(device_t, device_t, void *); 97 98static int mkclock_fhc_match(device_t, cfdata_t, void *); 99static void mkclock_fhc_attach(device_t, device_t, void *); 100 101static void mkclock_attach(struct mk48txx_softc *, int); 102 103static int mkclock_wenable(struct todr_chip_handle *, int); 104 105 106CFATTACH_DECL_NEW(mkclock_sbus, sizeof(struct mk48txx_softc), 107 mkclock_sbus_match, mkclock_sbus_attach, NULL, NULL); 108 109CFATTACH_DECL_NEW(mkclock_ebus, sizeof(struct mk48txx_softc), 110 mkclock_ebus_match, mkclock_ebus_attach, NULL, NULL); 111 112CFATTACH_DECL_NEW(mkclock_fhc, sizeof(struct mk48txx_softc), 113 mkclock_fhc_match, mkclock_fhc_attach, NULL, NULL); 114 115/* 116 * The OPENPROM calls the clock the "eeprom", so we have to have our 117 * own special match function to call it the "clock". 118 */ 119static int 120mkclock_sbus_match(device_t parent, cfdata_t cf, void *aux) 121{ 122 struct sbus_attach_args *sa = aux; 123 124 return (strcmp("eeprom", sa->sa_name) == 0); 125} 126 127static int 128mkclock_ebus_match(device_t parent, cfdata_t cf, void *aux) 129{ 130 struct ebus_attach_args *ea = aux; 131 132 return (strcmp("eeprom", ea->ea_name) == 0); 133} 134 135static int 136mkclock_fhc_match(device_t parent, cfdata_t cf, void *aux) 137{ 138 struct fhc_attach_args *fa = aux; 139 140 return (strcmp("eeprom", fa->fa_name) == 0); 141} 142 143/* 144 * Attach a clock (really `eeprom') to the sbus or ebus. 145 * 146 * We ignore any existing virtual address as we need to map 147 * this read-only and make it read-write only temporarily, 148 * whenever we read or write the clock chip. The clock also 149 * contains the ID ``PROM'', and I have already had the pleasure 150 * of reloading the CPU type, Ethernet address, etc, by hand from 151 * the console FORTH interpreter. I intend not to enjoy it again. 152 * 153 * the MK48T02 is 2K. the MK48T08 is 8K, and the MK48T59 is 154 * supposed to be identical to it. 155 * 156 * This is *UGLY*! We probably have multiple mappings. But I do 157 * know that this all fits inside an 8K page, so I'll just map in 158 * once. 159 * 160 * What we really need is some way to record the bus attach args 161 * so we can call *_bus_map() later with BUS_SPACE_MAP_READONLY 162 * or not to write enable/disable the device registers. This is 163 * a non-trivial operation. 164 */ 165 166/* ARGSUSED */ 167static void 168mkclock_sbus_attach(device_t parent, device_t self, void *aux) 169{ 170 struct mk48txx_softc *sc = device_private(self); 171 struct sbus_attach_args *sa = aux; 172 int sz; 173 174 sc->sc_dev = self; 175 sc->sc_bst = sa->sa_bustag; 176 177 /* use sa->sa_regs[0].size? */ 178 sz = 8192; 179 180 if (sbus_bus_map(sc->sc_bst, 181 sa->sa_slot, 182 trunc_page(sa->sa_offset), 183 sz, 184 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_READONLY, 185 &sc->sc_bsh) != 0) { 186 aprint_error(": can't map register\n"); 187 return; 188 } 189 mkclock_attach(sc, sa->sa_node); 190} 191 192 193/* ARGSUSED */ 194static void 195mkclock_ebus_attach(struct device *parent, struct device *self, void *aux) 196{ 197 struct mk48txx_softc *sc = device_private(self); 198 struct ebus_attach_args *ea = aux; 199 int sz; 200 201 sc->sc_dev = self; 202 sc->sc_bst = ea->ea_bustag; 203 204 /* hard code to 8K? */ 205 sz = ea->ea_reg[0].size; 206 207 if (bus_space_map(sc->sc_bst, 208 EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), 209 sz, 210 BUS_SPACE_MAP_LINEAR, 211 &sc->sc_bsh) != 0) { 212 aprint_error(": can't map register\n"); 213 return; 214 } 215 mkclock_attach(sc, ea->ea_node); 216} 217 218/* ARGSUSED */ 219static void 220mkclock_fhc_attach(struct device *parent, struct device *self, void *aux) 221{ 222 struct mk48txx_softc *sc = device_private(self); 223 struct fhc_attach_args *fa = aux; 224 225 sc->sc_dev = self; 226 sc->sc_bst = fa->fa_bustag; 227 228 if (fhc_bus_map(sc->sc_bst, 229 fa->fa_reg[0].fbr_slot, 230 (fa->fa_reg[0].fbr_offset & ~NBPG), 231 fa->fa_reg[0].fbr_size, 232 BUS_SPACE_MAP_LINEAR, 233 &sc->sc_bsh) != 0) { 234 aprint_error(": can't map register\n"); 235 return; 236 } 237 mkclock_attach(sc, fa->fa_node); 238} 239 240 241static void 242mkclock_attach(struct mk48txx_softc *sc, int node) 243{ 244 245 sc->sc_model = prom_getpropstring(node, "model"); 246 247#ifdef DIAGNOSTIC 248 if (sc->sc_model == NULL) 249 panic("clockattach: no model property"); 250#endif 251 252 /* Our TOD clock year 0 is 1968 */ 253 sc->sc_year0 = 1968; 254 255 /* Save info for the clock wenable call. */ 256 sc->sc_handle.todr_setwen = mkclock_wenable; 257 258 mk48txx_attach(sc); 259 260 aprint_normal("\n"); 261} 262 263/* 264 * Write en/dis-able clock registers. We coordinate so that several 265 * writers can run simultaneously. 266 */ 267static int 268mkclock_wenable(struct todr_chip_handle *handle, int onoff) 269{ 270 struct mk48txx_softc *sc; 271 vm_prot_t prot; 272 vaddr_t va; 273 int s, err = 0; 274 static int writers; 275 276 /* XXXSMP */ 277 s = splhigh(); 278 if (onoff) 279 prot = writers++ == 0 ? VM_PROT_READ|VM_PROT_WRITE : 0; 280 else 281 prot = --writers == 0 ? VM_PROT_READ : 0; 282 splx(s); 283 if (prot == VM_PROT_NONE) { 284 return 0; 285 } 286 sc = handle->cookie; 287 va = (vaddr_t)bus_space_vaddr(sc->sc_bst, sc->sc_bsh); 288 if (va == 0UL) { 289 printf("clock_wenable: WARNING -- cannot get va\n"); 290 return EIO; 291 } 292 pmap_kprotect(va, prot); 293 return (err); 294} 295