mkclock_isa.c revision 1.1
1 /* $NetBSD: mkclock_isa.c,v 1.1 2002/02/27 21:02:22 scw Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus J. Klein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Mostek MK48T18 time-of-day chip attachment to ISA bus, using two 41 * 8-bit ports for address selection and one 8-bit port for data. 42 */ 43 44 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 45 __KERNEL_RCSID(0, "$NetBSD: mkclock_isa.c,v 1.1 2002/02/27 21:02:22 scw Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/kernel.h> 49 #include <sys/systm.h> 50 #include <sys/device.h> 51 52 #include <machine/bus.h> 53 54 #include <dev/clock_subr.h> 55 #include <dev/ic/mk48txxreg.h> 56 57 #include <dev/isa/isavar.h> 58 59 60 /* Offsets of registers into ISA I/O space */ 61 #define MKCLOCK_STB0 0 /* Address low */ 62 #define MKCLOCK_STB1 1 /* Address high */ 63 #define MKCLOCK_DATA 3 /* Data port */ 64 65 #define MKCLOCK_NPORTS (MKCLOCK_DATA - MKCLOCK_STB0 + 1) 66 67 68 struct mkclock_isa_softc { 69 struct device sc_dev; /* Base device */ 70 71 bus_space_tag_t sc_iot; /* I/O space access */ 72 bus_space_handle_t sc_ioh; 73 74 todr_chip_handle_t sc_todr; /* MI todr interface handle */ 75 }; 76 77 78 /* Autoconfiguration interface */ 79 int mkclock_isa_match(struct device *, struct cfdata *, void *); 80 void mkclock_isa_attach(struct device *, struct device *, void *); 81 82 struct cfattach mkclock_isa_ca = { 83 sizeof (struct mkclock_isa_softc), mkclock_isa_match, 84 mkclock_isa_attach, 85 }; 86 87 88 /* mk48txx interface */ 89 uint8_t mkclock_isa_nvrd(bus_space_tag_t, bus_space_handle_t, int); 90 void mkclock_isa_nvwr(bus_space_tag_t, bus_space_handle_t, int, uint8_t); 91 92 93 int 94 mkclock_isa_match(struct device *parent, struct cfdata *match, void *aux) 95 { 96 struct isa_attach_args *ia = aux; 97 bus_space_handle_t ioh; 98 uint8_t csr, ocsr; 99 unsigned int t1, t2; 100 int found; 101 102 found = 0; 103 104 if (ia->ia_nio < 1 || 105 (ia->ia_io[0].ir_addr != ISACF_PORT_DEFAULT && 106 ia->ia_io[0].ir_addr != 0x74)) 107 return (0); 108 109 if (ia->ia_niomem > 0 && 110 (ia->ia_iomem[0].ir_addr != ISACF_IOMEM_DEFAULT)) 111 return (0); 112 113 if (ia->ia_nirq > 0 && 114 (ia->ia_irq[0].ir_irq != ISACF_IRQ_DEFAULT)) 115 return (0); 116 117 if (ia->ia_ndrq > 0 && 118 (ia->ia_drq[0].ir_drq != ISACF_DRQ_DEFAULT)) 119 return (0); 120 121 /* 122 * Map I/O space, then try to determine if it's really there. 123 */ 124 if (bus_space_map(ia->ia_iot, 0x74, MKCLOCK_NPORTS, 0, &ioh)) 125 return (0); 126 127 /* Supposedly no control bits are set after POST; check for this. */ 128 ocsr = mkclock_isa_nvrd(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR); 129 if (ocsr != 0) 130 goto unmap; 131 132 /* Set clock data to read mode, prohibiting updates from clock. */ 133 csr = ocsr | MK48TXX_CSR_READ; 134 mkclock_isa_nvwr(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR, csr); 135 /* Compare. */ 136 if (mkclock_isa_nvrd(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR) 137 != csr) 138 goto restore; 139 140 /* Read from the seconds counter. */ 141 t1 = FROMBCD(mkclock_isa_nvrd(ia->ia_iot, ioh, 142 MK48T18_CLKOFF + MK48TXX_ISEC)); 143 if (t1 > 59) 144 goto restore; 145 146 /* Make it tick again, wait, then look again. */ 147 mkclock_isa_nvwr(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR, ocsr); 148 DELAY(1100000); 149 mkclock_isa_nvwr(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR, csr); 150 t2 = FROMBCD(mkclock_isa_nvrd(ia->ia_iot, ioh, 151 MK48T18_CLKOFF + MK48TXX_ISEC)); 152 if (t2 > 59) 153 goto restore; 154 155 /* If [1,2) seconds have passed since, call it a clock. */ 156 if ((t1 + 1) % 60 == t2 || (t1 + 2) % 60 == t2) 157 found = 1; 158 159 restore: 160 mkclock_isa_nvwr(ia->ia_iot, ioh, MK48T18_CLKOFF + MK48TXX_ICSR, ocsr); 161 unmap: 162 bus_space_unmap(ia->ia_iot, ioh, MKCLOCK_NPORTS); 163 164 if (found) { 165 ia->ia_nio = 1; 166 ia->ia_io[0].ir_addr = 0x74; 167 ia->ia_io[0].ir_size = MKCLOCK_NPORTS; 168 169 ia->ia_niomem = 0; 170 ia->ia_nirq = 0; 171 ia->ia_ndrq = 0; 172 } 173 174 return (found); 175 } 176 177 void 178 mkclock_isa_attach(struct device *parent, struct device *self, void *aux) 179 { 180 struct isa_attach_args *ia = aux; 181 struct mkclock_isa_softc *sc = (struct mkclock_isa_softc *)self; 182 extern void clock_rtc_config(todr_chip_handle_t); 183 184 /* Map I/O space. */ 185 sc->sc_iot = ia->ia_iot; 186 if (bus_space_map(sc->sc_iot, ia->ia_io[0].ir_addr, 187 ia->ia_io[0].ir_size, 0, &sc->sc_ioh)) 188 panic("mkclock_isa_attach: couldn't map clock I/O space"); 189 190 /* Attach to MI mk48txx driver. */ 191 sc->sc_todr = mk48txx_attach(sc->sc_iot, sc->sc_ioh, "mk48t18", 1968, 192 mkclock_isa_nvrd, mkclock_isa_nvwr); 193 if (sc->sc_todr == NULL) 194 panic("\nmkclock_isa_attach: mk48txx attach failded"); 195 196 printf(" Timekeeper NVRAM/RTC\n"); 197 198 clock_rtc_config(sc->sc_todr); 199 } 200 201 /* 202 * Bus access methods for MI mk48txx driver. 203 */ 204 uint8_t 205 mkclock_isa_nvrd(bus_space_tag_t iot, bus_space_handle_t ioh, int off) 206 { 207 uint8_t datum; 208 int s; 209 210 s = splclock(); 211 bus_space_write_1(iot, ioh, MKCLOCK_STB0, off & 0xff); 212 bus_space_write_1(iot, ioh, MKCLOCK_STB1, off >> 8); 213 datum = bus_space_read_1(iot, ioh, MKCLOCK_DATA); 214 splx(s); 215 216 return (datum); 217 } 218 219 void 220 mkclock_isa_nvwr(bus_space_tag_t iot, bus_space_handle_t ioh, int off, 221 uint8_t datum) 222 { 223 int s; 224 225 s = splclock(); 226 bus_space_write_1(iot, ioh, MKCLOCK_STB0, off & 0xff); 227 bus_space_write_1(iot, ioh, MKCLOCK_STB1, off >> 8); 228 bus_space_write_1(iot, ioh, MKCLOCK_DATA, datum); 229 splx(s); 230 } 231
Indexes created Tue Sep 30 17:09:57 GMT 2025