mkclock_isa.c revision 1.2.10.2
1 1.2.10.2 jdolecek /* $NetBSD: mkclock_isa.c,v 1.2.10.2 2002/06/23 17:38:34 jdolecek Exp $ */ 2 1.2.10.2 jdolecek 3 1.2.10.2 jdolecek /*- 4 1.2.10.2 jdolecek * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 1.2.10.2 jdolecek * All rights reserved. 6 1.2.10.2 jdolecek * 7 1.2.10.2 jdolecek * This code is derived from software contributed to The NetBSD Foundation 8 1.2.10.2 jdolecek * by Klaus J. Klein. 9 1.2.10.2 jdolecek * 10 1.2.10.2 jdolecek * Redistribution and use in source and binary forms, with or without 11 1.2.10.2 jdolecek * modification, are permitted provided that the following conditions 12 1.2.10.2 jdolecek * are met: 13 1.2.10.2 jdolecek * 1. Redistributions of source code must retain the above copyright 14 1.2.10.2 jdolecek * notice, this list of conditions and the following disclaimer. 15 1.2.10.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.10.2 jdolecek * notice, this list of conditions and the following disclaimer in the 17 1.2.10.2 jdolecek * documentation and/or other materials provided with the distribution. 18 1.2.10.2 jdolecek * 3. All advertising materials mentioning features or use of this software 19 1.2.10.2 jdolecek * must display the following acknowledgement: 20 1.2.10.2 jdolecek * This product includes software developed by the NetBSD 21 1.2.10.2 jdolecek * Foundation, Inc. and its contributors. 22 1.2.10.2 jdolecek * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.2.10.2 jdolecek * contributors may be used to endorse or promote products derived 24 1.2.10.2 jdolecek * from this software without specific prior written permission. 25 1.2.10.2 jdolecek * 26 1.2.10.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.2.10.2 jdolecek * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.2.10.2 jdolecek * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.2.10.2 jdolecek * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.2.10.2 jdolecek * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.2.10.2 jdolecek * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.2.10.2 jdolecek * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.2.10.2 jdolecek * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.2.10.2 jdolecek * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.2.10.2 jdolecek * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.2.10.2 jdolecek * POSSIBILITY OF SUCH DAMAGE. 37 1.2.10.2 jdolecek */ 38 1.2.10.2 jdolecek 39 1.2.10.2 jdolecek /* 40 1.2.10.2 jdolecek * Mostek MK48T18 time-of-day chip attachment to ISA bus, using two 41 1.2.10.2 jdolecek * 8-bit ports for address selection and one 8-bit port for data. 42 1.2.10.2 jdolecek */ 43 1.2.10.2 jdolecek 44 1.2.10.2 jdolecek #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 45 1.2.10.2 jdolecek __KERNEL_RCSID(0, "$NetBSD: mkclock_isa.c,v 1.2.10.2 2002/06/23 17:38:34 jdolecek Exp $"); 46 1.2.10.2 jdolecek 47 1.2.10.2 jdolecek #include <sys/param.h> 48 1.2.10.2 jdolecek #include <sys/kernel.h> 49 1.2.10.2 jdolecek #include <sys/systm.h> 50 1.2.10.2 jdolecek #include <sys/device.h> 51 1.2.10.2 jdolecek 52 1.2.10.2 jdolecek #include <machine/bus.h> 53 1.2.10.2 jdolecek 54 1.2.10.2 jdolecek #include <dev/clock_subr.h> 55 1.2.10.2 jdolecek #include <dev/ic/mk48txxreg.h> 56 1.2.10.2 jdolecek 57 1.2.10.2 jdolecek #include <dev/isa/isavar.h> 58 1.2.10.2 jdolecek 59 1.2.10.2 jdolecek 60 1.2.10.2 jdolecek /* Offsets of registers into ISA I/O space */ 61 1.2.10.2 jdolecek #define MKCLOCK_STB0 0 /* Address low */ 62 1.2.10.2 jdolecek #define MKCLOCK_STB1 1 /* Address high */ 63 1.2.10.2 jdolecek #define MKCLOCK_DATA 3 /* Data port */ 64 1.2.10.2 jdolecek 65 1.2.10.2 jdolecek #define MKCLOCK_NPORTS (MKCLOCK_DATA - MKCLOCK_STB0 + 1) 66 1.2.10.2 jdolecek 67 1.2.10.2 jdolecek 68 1.2.10.2 jdolecek struct mkclock_isa_softc { 69 1.2.10.2 jdolecek struct device sc_dev; /* Base device */ 70 1.2.10.2 jdolecek 71 1.2.10.2 jdolecek bus_space_tag_t sc_iot; /* I/O space access */ 72 1.2.10.2 jdolecek bus_space_handle_t sc_ioh; 73 1.2.10.2 jdolecek 74 1.2.10.2 jdolecek todr_chip_handle_t sc_todr; /* MI todr interface handle */ 75 1.2.10.2 jdolecek }; 76 1.2.10.2 jdolecek 77 1.2.10.2 jdolecek 78 1.2.10.2 jdolecek /* Autoconfiguration interface */ 79 1.2.10.2 jdolecek int mkclock_isa_match(struct device *, struct cfdata *, void *); 80 1.2.10.2 jdolecek void mkclock_isa_attach(struct device *, struct device *, void *); 81 1.2.10.2 jdolecek 82 1.2.10.2 jdolecek struct cfattach mkclock_isa_ca = { 83 1.2.10.2 jdolecek sizeof (struct mkclock_isa_softc), mkclock_isa_match, 84 1.2.10.2 jdolecek mkclock_isa_attach, 85 1.2.10.2 jdolecek }; 86 1.2.10.2 jdolecek 87 1.2.10.2 jdolecek 88 1.2.10.2 jdolecek /* mk48txx interface */ 89 1.2.10.2 jdolecek uint8_t mkclock_isa_nvrd(bus_space_tag_t, bus_space_handle_t, int); 90 1.2.10.2 jdolecek void mkclock_isa_nvwr(bus_space_tag_t, bus_space_handle_t, int, uint8_t); 91 1.2.10.2 jdolecek 92 1.2.10.2 jdolecek 93 1.2.10.2 jdolecek int 94 1.2.10.2 jdolecek mkclock_isa_match(struct device *parent, struct cfdata *match, void *aux) 95 1.2.10.2 jdolecek { 96 1.2.10.2 jdolecek struct isa_attach_args *ia = aux; 97 1.2.10.2 jdolecek bus_space_handle_t ioh; 98 1.2.10.2 jdolecek uint8_t csr, ocsr; 99 1.2.10.2 jdolecek unsigned int t1, t2; 100 1.2.10.2 jdolecek int found; 101 1.2.10.2 jdolecek 102 1.2.10.2 jdolecek found = 0; 103 1.2.10.2 jdolecek 104 1.2.10.2 jdolecek if (ia->ia_nio < 1 || 105 1.2.10.2 jdolecek (ia->ia_io[0].ir_addr != ISACF_PORT_DEFAULT && 106 1.2.10.2 jdolecek ia->ia_io[0].ir_addr != 0x74)) 107 1.2.10.2 jdolecek return (0); 108 1.2.10.2 jdolecek 109 1.2.10.2 jdolecek if (ia->ia_niomem > 0 && 110 1.2.10.2 jdolecek (ia->ia_iomem[0].ir_addr != ISACF_IOMEM_DEFAULT)) 111 1.2.10.2 jdolecek return (0); 112 1.2.10.2 jdolecek 113 1.2.10.2 jdolecek if (ia->ia_nirq > 0 && 114 1.2.10.2 jdolecek (ia->ia_irq[0].ir_irq != ISACF_IRQ_DEFAULT)) 115 1.2.10.2 jdolecek return (0); 116 1.2.10.2 jdolecek 117 1.2.10.2 jdolecek if (ia->ia_ndrq > 0 && 118 1.2.10.2 jdolecek (ia->ia_drq[0].ir_drq != ISACF_DRQ_DEFAULT)) 119 1.2.10.2 jdolecek return (0); 120 1.2.10.2 jdolecek 121 1.2.10.2 jdolecek /* 122 1.2.10.2 jdolecek * Map I/O space, then try to determine if it's really there. 123 1.2.10.2 jdolecek */ 124 1.2.10.2 jdolecek if (bus_space_map(ia->ia_iot, 0x74, MKCLOCK_NPORTS, 0, &ioh)) 125 1.2.10.2 jdolecek return (0); 126 1.2.10.2 jdolecek 127 1.2.10.2 jdolecek /* Supposedly no control bits are set after POST; check for this. */ 128 1.2.10.2 jdolecek ocsr = mkclock_isa_nvrd(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR); 129 1.2.10.2 jdolecek if (ocsr != 0) 130 1.2.10.2 jdolecek goto unmap; 131 1.2.10.2 jdolecek 132 1.2.10.2 jdolecek /* Set clock data to read mode, prohibiting updates from clock. */ 133 1.2.10.2 jdolecek csr = ocsr | MK48TXX_CSR_READ; 134 1.2.10.2 jdolecek mkclock_isa_nvwr(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR, csr); 135 1.2.10.2 jdolecek /* Compare. */ 136 1.2.10.2 jdolecek if (mkclock_isa_nvrd(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR) 137 1.2.10.2 jdolecek != csr) 138 1.2.10.2 jdolecek goto restore; 139 1.2.10.2 jdolecek 140 1.2.10.2 jdolecek /* Read from the seconds counter. */ 141 1.2.10.2 jdolecek t1 = FROMBCD(mkclock_isa_nvrd(ia->ia_iot, ioh, 142 1.2.10.2 jdolecek MK48T18_CLKOFF + MK48TXX_ISEC)); 143 1.2.10.2 jdolecek if (t1 > 59) 144 1.2.10.2 jdolecek goto restore; 145 1.2.10.2 jdolecek 146 1.2.10.2 jdolecek /* Make it tick again, wait, then look again. */ 147 1.2.10.2 jdolecek mkclock_isa_nvwr(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR, ocsr); 148 1.2.10.2 jdolecek DELAY(1100000); 149 1.2.10.2 jdolecek mkclock_isa_nvwr(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR, csr); 150 1.2.10.2 jdolecek t2 = FROMBCD(mkclock_isa_nvrd(ia->ia_iot, ioh, 151 1.2.10.2 jdolecek MK48T18_CLKOFF + MK48TXX_ISEC)); 152 1.2.10.2 jdolecek if (t2 > 59) 153 1.2.10.2 jdolecek goto restore; 154 1.2.10.2 jdolecek 155 1.2.10.2 jdolecek /* If [1,2) seconds have passed since, call it a clock. */ 156 1.2.10.2 jdolecek if ((t1 + 1) % 60 == t2 || (t1 + 2) % 60 == t2) 157 1.2.10.2 jdolecek found = 1; 158 1.2.10.2 jdolecek 159 1.2.10.2 jdolecek restore: 160 1.2.10.2 jdolecek mkclock_isa_nvwr(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR, ocsr); 161 1.2.10.2 jdolecek unmap: 162 1.2.10.2 jdolecek bus_space_unmap(ia->ia_iot, ioh, MKCLOCK_NPORTS); 163 1.2.10.2 jdolecek 164 1.2.10.2 jdolecek if (found) { 165 1.2.10.2 jdolecek ia->ia_nio = 1; 166 1.2.10.2 jdolecek ia->ia_io[0].ir_addr = 0x74; 167 1.2.10.2 jdolecek ia->ia_io[0].ir_size = MKCLOCK_NPORTS; 168 1.2.10.2 jdolecek 169 1.2.10.2 jdolecek ia->ia_niomem = 0; 170 1.2.10.2 jdolecek ia->ia_nirq = 0; 171 1.2.10.2 jdolecek ia->ia_ndrq = 0; 172 1.2.10.2 jdolecek } 173 1.2.10.2 jdolecek 174 1.2.10.2 jdolecek return (found); 175 1.2.10.2 jdolecek } 176 1.2.10.2 jdolecek 177 1.2.10.2 jdolecek void 178 1.2.10.2 jdolecek mkclock_isa_attach(struct device *parent, struct device *self, void *aux) 179 1.2.10.2 jdolecek { 180 1.2.10.2 jdolecek struct isa_attach_args *ia = aux; 181 1.2.10.2 jdolecek struct mkclock_isa_softc *sc = (struct mkclock_isa_softc *)self; 182 1.2.10.2 jdolecek extern void clock_rtc_config(todr_chip_handle_t); 183 1.2.10.2 jdolecek 184 1.2.10.2 jdolecek /* Map I/O space. */ 185 1.2.10.2 jdolecek sc->sc_iot = ia->ia_iot; 186 1.2.10.2 jdolecek if (bus_space_map(sc->sc_iot, ia->ia_io[0].ir_addr, 187 1.2.10.2 jdolecek ia->ia_io[0].ir_size, 0, &sc->sc_ioh)) 188 1.2.10.2 jdolecek panic("mkclock_isa_attach: couldn't map clock I/O space"); 189 1.2.10.2 jdolecek 190 1.2.10.2 jdolecek /* Attach to MI mk48txx driver. */ 191 1.2.10.2 jdolecek sc->sc_todr = mk48txx_attach(sc->sc_iot, sc->sc_ioh, "mk48t18", 1968, 192 1.2.10.2 jdolecek mkclock_isa_nvrd, mkclock_isa_nvwr); 193 1.2.10.2 jdolecek if (sc->sc_todr == NULL) 194 1.2.10.2 jdolecek panic("\nmkclock_isa_attach: mk48txx attach failed"); 195 1.2.10.2 jdolecek 196 1.2.10.2 jdolecek printf(" Timekeeper NVRAM/RTC\n"); 197 1.2.10.2 jdolecek 198 1.2.10.2 jdolecek clock_rtc_config(sc->sc_todr); 199 1.2.10.2 jdolecek } 200 1.2.10.2 jdolecek 201 1.2.10.2 jdolecek /* 202 1.2.10.2 jdolecek * Bus access methods for MI mk48txx driver. 203 1.2.10.2 jdolecek */ 204 1.2.10.2 jdolecek uint8_t 205 1.2.10.2 jdolecek mkclock_isa_nvrd(bus_space_tag_t iot, bus_space_handle_t ioh, int off) 206 1.2.10.2 jdolecek { 207 1.2.10.2 jdolecek uint8_t datum; 208 1.2.10.2 jdolecek int s; 209 1.2.10.2 jdolecek 210 1.2.10.2 jdolecek s = splclock(); 211 1.2.10.2 jdolecek bus_space_write_1(iot, ioh, MKCLOCK_STB0, off & 0xff); 212 1.2.10.2 jdolecek bus_space_write_1(iot, ioh, MKCLOCK_STB1, off >> 8); 213 1.2.10.2 jdolecek datum = bus_space_read_1(iot, ioh, MKCLOCK_DATA); 214 1.2.10.2 jdolecek splx(s); 215 1.2.10.2 jdolecek 216 1.2.10.2 jdolecek return (datum); 217 1.2.10.2 jdolecek } 218 1.2.10.2 jdolecek 219 1.2.10.2 jdolecek void 220 1.2.10.2 jdolecek mkclock_isa_nvwr(bus_space_tag_t iot, bus_space_handle_t ioh, int off, 221 1.2.10.2 jdolecek uint8_t datum) 222 1.2.10.2 jdolecek { 223 1.2.10.2 jdolecek int s; 224 1.2.10.2 jdolecek 225 1.2.10.2 jdolecek s = splclock(); 226 1.2.10.2 jdolecek bus_space_write_1(iot, ioh, MKCLOCK_STB0, off & 0xff); 227 1.2.10.2 jdolecek bus_space_write_1(iot, ioh, MKCLOCK_STB1, off >> 8); 228 1.2.10.2 jdolecek bus_space_write_1(iot, ioh, MKCLOCK_DATA, datum); 229 1.2.10.2 jdolecek splx(s); 230 1.2.10.2 jdolecek } 231
Indexes created Sat Oct 25 07:10:08 GMT 2025