mkclock.c revision 1.1
1/* $NetBSD: mkclock.c,v 1.1 2006/11/09 15:08:04 tsutsui 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 1.1 2006/11/09 15:08:04 tsutsui 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 <machine/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 <sparc64/dev/iommureg.h> 84#include <sparc64/dev/sbusreg.h> 85#include <dev/sbus/sbusvar.h> 86#include <dev/ebus/ebusreg.h> 87#include <dev/ebus/ebusvar.h> 88 89/* 90 * clock (eeprom) attaches at the sbus or the ebus (PCI) 91 */ 92static int mkclock_sbus_match(struct device *, struct cfdata *, void *); 93static void mkclock_sbus_attach(struct device *, struct device *, void *); 94 95static int mkclock_ebus_match(struct device *, struct cfdata *, void *); 96static void mkclock_ebus_attach(struct device *, struct device *, void *); 97 98static void mkclock_attach(struct mk48txx_softc *, int); 99 100static int mkclock_wenable(struct todr_chip_handle *, int); 101 102 103CFATTACH_DECL(mkclock_sbus, sizeof(struct mk48txx_softc), 104 mkclock_sbus_match, mkclock_sbus_attach, NULL, NULL); 105 106CFATTACH_DECL(mkclock_ebus, sizeof(struct mk48txx_softc), 107 mkclock_ebus_match, mkclock_ebus_attach, NULL, NULL); 108 109/* 110 * The OPENPROM calls the clock the "eeprom", so we have to have our 111 * own special match function to call it the "clock". 112 */ 113static int 114mkclock_sbus_match(struct device *parent, struct cfdata *cf, void *aux) 115{ 116 struct sbus_attach_args *sa = aux; 117 118 return (strcmp("eeprom", sa->sa_name) == 0); 119} 120 121static int 122mkclock_ebus_match(struct device *parent, struct cfdata *cf, void *aux) 123{ 124 struct ebus_attach_args *ea = aux; 125 126 return (strcmp("eeprom", ea->ea_name) == 0); 127} 128 129/* 130 * Attach a clock (really `eeprom') to the sbus or ebus. 131 * 132 * We ignore any existing virtual address as we need to map 133 * this read-only and make it read-write only temporarily, 134 * whenever we read or write the clock chip. The clock also 135 * contains the ID ``PROM'', and I have already had the pleasure 136 * of reloading the CPU type, Ethernet address, etc, by hand from 137 * the console FORTH interpreter. I intend not to enjoy it again. 138 * 139 * the MK48T02 is 2K. the MK48T08 is 8K, and the MK48T59 is 140 * supposed to be identical to it. 141 * 142 * This is *UGLY*! We probably have multiple mappings. But I do 143 * know that this all fits inside an 8K page, so I'll just map in 144 * once. 145 * 146 * What we really need is some way to record the bus attach args 147 * so we can call *_bus_map() later with BUS_SPACE_MAP_READONLY 148 * or not to write enable/disable the device registers. This is 149 * a non-trivial operation. 150 */ 151 152/* ARGSUSED */ 153static void 154mkclock_sbus_attach(struct device *parent, struct device *self, void *aux) 155{ 156 struct mk48txx_softc *sc = (void *)self; 157 struct sbus_attach_args *sa = aux; 158 int sz; 159 160 sc->sc_bst = sa->sa_bustag; 161 162 /* use sa->sa_regs[0].size? */ 163 sz = 8192; 164 165 if (sbus_bus_map(sc->sc_bst, 166 sa->sa_slot, 167 (sa->sa_offset & ~(PAGE_SIZE - 1)), 168 sz, 169 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_READONLY, 170 &sc->sc_bsh) != 0) { 171 printf("%s: can't map register\n", self->dv_xname); 172 return; 173 } 174 mkclock_attach(sc, sa->sa_node); 175} 176 177 178/* ARGSUSED */ 179static void 180mkclock_ebus_attach(struct device *parent, struct device *self, void *aux) 181{ 182 struct mk48txx_softc *sc = (void *)self; 183 struct ebus_attach_args *ea = aux; 184 int sz; 185 186 sc->sc_bst = ea->ea_bustag; 187 188 /* hard code to 8K? */ 189 sz = ea->ea_reg[0].size; 190 191 if (bus_space_map(sc->sc_bst, 192 EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), 193 sz, 194 BUS_SPACE_MAP_LINEAR, 195 &sc->sc_bsh) != 0) { 196 printf("%s: can't map register\n", self->dv_xname); 197 return; 198 } 199 mkclock_attach(sc, ea->ea_node); 200} 201 202 203static void 204mkclock_attach(struct mk48txx_softc *sc, int node) 205{ 206 207 sc->sc_model = prom_getpropstring(node, "model"); 208 209#ifdef DIAGNOSTIC 210 if (sc->sc_model == NULL) 211 panic("clockattach: no model property"); 212#endif 213 214 /* Our TOD clock year 0 is 1968 */ 215 sc->sc_year0 = 1968; 216 mk48txx_attach(sc); 217 218 printf("\n"); 219 220 /* Save info for the clock wenable call. */ 221 sc->sc_handle.todr_setwen = mkclock_wenable; 222 223 todr_attach(&sc->sc_handle); 224} 225 226/* 227 * Write en/dis-able clock registers. We coordinate so that several 228 * writers can run simultaneously. 229 */ 230static int 231mkclock_wenable(struct todr_chip_handle *handle, int onoff) 232{ 233 struct mk48txx_softc *sc; 234 vm_prot_t prot; 235 vaddr_t va; 236 int s, err = 0; 237 static int writers; 238 239 s = splhigh(); 240 if (onoff) 241 prot = writers++ == 0 ? VM_PROT_READ|VM_PROT_WRITE : 0; 242 else 243 prot = --writers == 0 ? VM_PROT_READ : 0; 244 splx(s); 245 if (prot == VM_PROT_NONE) { 246 return 0; 247 } 248 sc = handle->cookie; 249 va = (vaddr_t)bus_space_vaddr(sc->sc_bst, sc->sc_bsh); 250 if (va == 0UL) { 251 printf("clock_wenable: WARNING -- cannot get va\n"); 252 return EIO; 253 } 254 pmap_kprotect(va, prot); 255 return (err); 256} 257