1 /* $NetBSD: mkclock.c,v 1.6 2009/10/24 14:52:19 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 1.6 2009/10/24 14:52:19 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 <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 */ 92 static int mkclock_sbus_match(device_t, cfdata_t, void *); 93 static void mkclock_sbus_attach(device_t, device_t, void *); 94 95 static int mkclock_ebus_match(device_t, cfdata_t, void *); 96 static void mkclock_ebus_attach(device_t, device_t, void *); 97 98 static void mkclock_attach(struct mk48txx_softc *, int); 99 100 static int mkclock_wenable(struct todr_chip_handle *, int); 101 102 103 CFATTACH_DECL_NEW(mkclock_sbus, sizeof(struct mk48txx_softc), 104 mkclock_sbus_match, mkclock_sbus_attach, NULL, NULL); 105 106 CFATTACH_DECL_NEW(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 */ 113 static int 114 mkclock_sbus_match(device_t parent, cfdata_t cf, void *aux) 115 { 116 struct sbus_attach_args *sa = aux; 117 118 return (strcmp("eeprom", sa->sa_name) == 0); 119 } 120 121 static int 122 mkclock_ebus_match(device_t parent, cfdata_t 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 */ 153 static void 154 mkclock_sbus_attach(device_t parent, device_t self, void *aux) 155 { 156 struct mk48txx_softc *sc = device_private(self); 157 struct sbus_attach_args *sa = aux; 158 int sz; 159 160 sc->sc_dev = self; 161 sc->sc_bst = sa->sa_bustag; 162 163 /* use sa->sa_regs[0].size? */ 164 sz = 8192; 165 166 if (sbus_bus_map(sc->sc_bst, 167 sa->sa_slot, 168 trunc_page(sa->sa_offset), 169 sz, 170 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_READONLY, 171 &sc->sc_bsh) != 0) { 172 aprint_error(": can't map register\n"); 173 return; 174 } 175 mkclock_attach(sc, sa->sa_node); 176 } 177 178 179 /* ARGSUSED */ 180 static void 181 mkclock_ebus_attach(struct device *parent, struct device *self, void *aux) 182 { 183 struct mk48txx_softc *sc = device_private(self); 184 struct ebus_attach_args *ea = aux; 185 int sz; 186 187 sc->sc_dev = self; 188 sc->sc_bst = ea->ea_bustag; 189 190 /* hard code to 8K? */ 191 sz = ea->ea_reg[0].size; 192 193 if (bus_space_map(sc->sc_bst, 194 EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), 195 sz, 196 BUS_SPACE_MAP_LINEAR, 197 &sc->sc_bsh) != 0) { 198 aprint_error(": can't map register\n"); 199 return; 200 } 201 mkclock_attach(sc, ea->ea_node); 202 } 203 204 205 static void 206 mkclock_attach(struct mk48txx_softc *sc, int node) 207 { 208 209 sc->sc_model = prom_getpropstring(node, "model"); 210 211 #ifdef DIAGNOSTIC 212 if (sc->sc_model == NULL) 213 panic("clockattach: no model property"); 214 #endif 215 216 /* Our TOD clock year 0 is 1968 */ 217 sc->sc_year0 = 1968; 218 219 /* Save info for the clock wenable call. */ 220 sc->sc_handle.todr_setwen = mkclock_wenable; 221 222 mk48txx_attach(sc); 223 224 aprint_normal("\n"); 225 } 226 227 /* 228 * Write en/dis-able clock registers. We coordinate so that several 229 * writers can run simultaneously. 230 */ 231 static int 232 mkclock_wenable(struct todr_chip_handle *handle, int onoff) 233 { 234 struct mk48txx_softc *sc; 235 vm_prot_t prot; 236 vaddr_t va; 237 int s, err = 0; 238 static int writers; 239 240 s = splhigh(); 241 if (onoff) 242 prot = writers++ == 0 ? VM_PROT_READ|VM_PROT_WRITE : 0; 243 else 244 prot = --writers == 0 ? VM_PROT_READ : 0; 245 splx(s); 246 if (prot == VM_PROT_NONE) { 247 return 0; 248 } 249 sc = handle->cookie; 250 va = (vaddr_t)bus_space_vaddr(sc->sc_bst, sc->sc_bsh); 251 if (va == 0UL) { 252 printf("clock_wenable: WARNING -- cannot get va\n"); 253 return EIO; 254 } 255 pmap_kprotect(va, prot); 256 return (err); 257 } 258