1 /* $NetBSD: mkclock.c,v 1.7 2011/03/12 11:42:57 nakayama 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 1.7 2011/03/12 11:42:57 nakayama 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 <dev/sbus/sbusvar.h> 84 #include <dev/ebus/ebusreg.h> 85 #include <dev/ebus/ebusvar.h> 86 87 /* 88 * clock (eeprom) attaches at the sbus or the ebus (PCI) 89 */ 90 static int mkclock_sbus_match(device_t, cfdata_t, void *); 91 static void mkclock_sbus_attach(device_t, device_t, void *); 92 93 static int mkclock_ebus_match(device_t, cfdata_t, void *); 94 static void mkclock_ebus_attach(device_t, device_t, void *); 95 96 static void mkclock_attach(struct mk48txx_softc *, int); 97 98 static int mkclock_wenable(struct todr_chip_handle *, int); 99 100 101 CFATTACH_DECL_NEW(mkclock_sbus, sizeof(struct mk48txx_softc), 102 mkclock_sbus_match, mkclock_sbus_attach, NULL, NULL); 103 104 CFATTACH_DECL_NEW(mkclock_ebus, sizeof(struct mk48txx_softc), 105 mkclock_ebus_match, mkclock_ebus_attach, NULL, NULL); 106 107 /* 108 * The OPENPROM calls the clock the "eeprom", so we have to have our 109 * own special match function to call it the "clock". 110 */ 111 static int 112 mkclock_sbus_match(device_t parent, cfdata_t cf, void *aux) 113 { 114 struct sbus_attach_args *sa = aux; 115 116 return (strcmp("eeprom", sa->sa_name) == 0); 117 } 118 119 static int 120 mkclock_ebus_match(device_t parent, cfdata_t cf, void *aux) 121 { 122 struct ebus_attach_args *ea = aux; 123 124 return (strcmp("eeprom", ea->ea_name) == 0); 125 } 126 127 /* 128 * Attach a clock (really `eeprom') to the sbus or ebus. 129 * 130 * We ignore any existing virtual address as we need to map 131 * this read-only and make it read-write only temporarily, 132 * whenever we read or write the clock chip. The clock also 133 * contains the ID ``PROM'', and I have already had the pleasure 134 * of reloading the CPU type, Ethernet address, etc, by hand from 135 * the console FORTH interpreter. I intend not to enjoy it again. 136 * 137 * the MK48T02 is 2K. the MK48T08 is 8K, and the MK48T59 is 138 * supposed to be identical to it. 139 * 140 * This is *UGLY*! We probably have multiple mappings. But I do 141 * know that this all fits inside an 8K page, so I'll just map in 142 * once. 143 * 144 * What we really need is some way to record the bus attach args 145 * so we can call *_bus_map() later with BUS_SPACE_MAP_READONLY 146 * or not to write enable/disable the device registers. This is 147 * a non-trivial operation. 148 */ 149 150 /* ARGSUSED */ 151 static void 152 mkclock_sbus_attach(device_t parent, device_t self, void *aux) 153 { 154 struct mk48txx_softc *sc = device_private(self); 155 struct sbus_attach_args *sa = aux; 156 int sz; 157 158 sc->sc_dev = self; 159 sc->sc_bst = sa->sa_bustag; 160 161 /* use sa->sa_regs[0].size? */ 162 sz = 8192; 163 164 if (sbus_bus_map(sc->sc_bst, 165 sa->sa_slot, 166 trunc_page(sa->sa_offset), 167 sz, 168 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_READONLY, 169 &sc->sc_bsh) != 0) { 170 aprint_error(": can't map register\n"); 171 return; 172 } 173 mkclock_attach(sc, sa->sa_node); 174 } 175 176 177 /* ARGSUSED */ 178 static void 179 mkclock_ebus_attach(struct device *parent, struct device *self, void *aux) 180 { 181 struct mk48txx_softc *sc = device_private(self); 182 struct ebus_attach_args *ea = aux; 183 int sz; 184 185 sc->sc_dev = self; 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 aprint_error(": can't map register\n"); 197 return; 198 } 199 mkclock_attach(sc, ea->ea_node); 200 } 201 202 203 static void 204 mkclock_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; 216 217 /* Save info for the clock wenable call. */ 218 sc->sc_handle.todr_setwen = mkclock_wenable; 219 220 mk48txx_attach(sc); 221 222 aprint_normal("\n"); 223 } 224 225 /* 226 * Write en/dis-able clock registers. We coordinate so that several 227 * writers can run simultaneously. 228 */ 229 static int 230 mkclock_wenable(struct todr_chip_handle *handle, int onoff) 231 { 232 struct mk48txx_softc *sc; 233 vm_prot_t prot; 234 vaddr_t va; 235 int s, err = 0; 236 static int writers; 237 238 s = splhigh(); 239 if (onoff) 240 prot = writers++ == 0 ? VM_PROT_READ|VM_PROT_WRITE : 0; 241 else 242 prot = --writers == 0 ? VM_PROT_READ : 0; 243 splx(s); 244 if (prot == VM_PROT_NONE) { 245 return 0; 246 } 247 sc = handle->cookie; 248 va = (vaddr_t)bus_space_vaddr(sc->sc_bst, sc->sc_bsh); 249 if (va == 0UL) { 250 printf("clock_wenable: WARNING -- cannot get va\n"); 251 return EIO; 252 } 253 pmap_kprotect(va, prot); 254 return (err); 255 } 256