1 /* $OpenBSD: geodesc.c,v 1.12 2012/12/05 23:20:12 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Markus Friedl <markus@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /* 20 * Geode SC1100 Information Appliance On a Chip 21 * http://www.national.com/ds.cgi/SC/SC1100.pdf 22 */ 23 24 #include <sys/param.h> 25 #include <sys/systm.h> 26 #include <sys/device.h> 27 #include <sys/timetc.h> 28 29 #include <machine/bus.h> 30 31 #include <dev/pci/pcivar.h> 32 #include <dev/pci/pcidevs.h> 33 34 #include <arch/i386/pci/geodescreg.h> 35 36 struct geodesc_softc { 37 struct device sc_dev; 38 bus_space_tag_t sc_iot; 39 bus_space_handle_t sc_ioh; 40 }; 41 42 int geodesc_match(struct device *, void *, void *); 43 void geodesc_attach(struct device *, struct device *, void *); 44 void sc1100_sysreset(void); 45 46 #ifndef SMALL_KERNEL 47 int geodesc_wdogctl_cb(void *, int); 48 #endif /* SMALL_KERNEL */ 49 50 struct cfattach geodesc_ca = { 51 sizeof(struct geodesc_softc), geodesc_match, geodesc_attach 52 }; 53 54 struct cfdriver geodesc_cd = { 55 NULL, "geodesc", DV_DULL 56 }; 57 58 u_int geodesc_get_timecount(struct timecounter *tc); 59 60 struct timecounter geodesc_timecounter = { 61 geodesc_get_timecount, /* get_timecount */ 62 0, /* no poll_pps */ 63 0xffffffff, /* counter_mask */ 64 27000000, /* frequency */ 65 "GEOTSC", /* name */ 66 2000 /* quality */ 67 }; 68 69 int 70 geodesc_match(struct device *parent, void *match, void *aux) 71 { 72 struct pci_attach_args *pa = aux; 73 74 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NS && 75 (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NS_SC1100_XBUS || 76 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NS_SCx200_XBUS)) 77 return (1); 78 return (0); 79 } 80 81 #define WDSTSBITS "\20\x04WDRST\x03WDSMI\x02WDINT\x01WDOVF" 82 83 void 84 geodesc_attach(struct device *parent, struct device *self, void *aux) 85 { 86 struct geodesc_softc *sc = (void *) self; 87 struct pci_attach_args *pa = aux; 88 uint16_t cnfg, cba; 89 uint8_t sts, rev, iid; 90 pcireg_t reg; 91 extern void (*cpuresetfn)(void); 92 93 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, SC1100_F5_SCRATCHPAD); 94 sc->sc_iot = pa->pa_iot; 95 if (reg == 0 || 96 bus_space_map(sc->sc_iot, reg, 64, 0, &sc->sc_ioh)) { 97 printf(": unable to map registers at 0x%x\n", reg); 98 return; 99 } 100 cba = bus_space_read_2(sc->sc_iot, sc->sc_ioh, GCB_CBA); 101 if (cba != reg) { 102 printf(": cba mismatch: cba 0x%x != reg 0x%x\n", cba, reg); 103 bus_space_unmap(sc->sc_iot, sc->sc_ioh, 64); 104 return; 105 } 106 sts = bus_space_read_1(sc->sc_iot, sc->sc_ioh, GCB_WDSTS); 107 cnfg = bus_space_read_2(sc->sc_iot, sc->sc_ioh, GCB_WDCNFG); 108 iid = bus_space_read_1(sc->sc_iot, sc->sc_ioh, GCB_IID); 109 rev = bus_space_read_1(sc->sc_iot, sc->sc_ioh, GCB_REV); 110 111 printf(": iid %d revision %d wdstatus %b\n", iid, rev, sts, WDSTSBITS); 112 113 #ifndef SMALL_KERNEL 114 /* setup and register watchdog */ 115 bus_space_write_2(sc->sc_iot, sc->sc_ioh, GCB_WDTO, 0); 116 sts |= WDOVF_CLEAR; 117 bus_space_write_1(sc->sc_iot, sc->sc_ioh, GCB_WDSTS, sts); 118 cnfg &= ~WDCNFG_MASK; 119 cnfg |= WDTYPE1_RESET|WDPRES_DIV_512; 120 bus_space_write_2(sc->sc_iot, sc->sc_ioh, GCB_WDCNFG, cnfg); 121 122 wdog_register(geodesc_wdogctl_cb, sc); 123 #endif /* SMALL_KERNEL */ 124 125 bus_space_write_4(sc->sc_iot, sc->sc_ioh, GCB_TSCNFG, TSC_ENABLE); 126 /* Hook into the kern_tc */ 127 geodesc_timecounter.tc_priv = sc; 128 tc_init(&geodesc_timecounter); 129 130 /* We have a special way to reset the CPU on the SC1100 */ 131 cpuresetfn = sc1100_sysreset; 132 } 133 134 #ifndef SMALL_KERNEL 135 int 136 geodesc_wdogctl_cb(void *self, int period) 137 { 138 struct geodesc_softc *sc = self; 139 140 if (period > 0x03ff) 141 period = 0x03ff; 142 bus_space_write_2(sc->sc_iot, sc->sc_ioh, GCB_WDTO, period * 64); 143 return (period); 144 } 145 #endif /* SMALL_KERNEL */ 146 147 u_int 148 geodesc_get_timecount(struct timecounter *tc) 149 { 150 struct geodesc_softc *sc = tc->tc_priv; 151 152 return (bus_space_read_4(sc->sc_iot, sc->sc_ioh, GCB_TSC)); 153 } 154 155 void 156 sc1100_sysreset(void) 157 { 158 /* 159 * Reset AMD Geode SC1100. 160 * 161 * 1) Write PCI Configuration Address Register (0xcf8) to 162 * select Function 0, Register 0x44: Bridge Configuration, 163 * GPIO and LPC Configuration Register Space, Reset 164 * Control Register. 165 * 166 * 2) Write 0xf to PCI Configuration Data Register (0xcfc) 167 * to reset IDE controller, IDE bus, and PCI bus, and 168 * to trigger a system-wide reset. 169 * 170 * See AMD Geode SC1100 Processor Data Book, Revision 2.0, 171 * sections 6.3.1, 6.3.2, and 6.4.1. 172 */ 173 outl(0xCF8, 0x80009044UL); 174 outb(0xCFC, 0x0F); 175 } 176