Annotation of sys/arch/i386/pci/geodesc.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: geodesc.c,v 1.9 2006/12/11 20:57:40 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/cdefs.h>
! 25: #include <sys/param.h>
! 26: #include <sys/systm.h>
! 27: #include <sys/device.h>
! 28: #ifdef __HAVE_TIMECOUNTER
! 29: #include <sys/timetc.h>
! 30: #endif
! 31:
! 32: #include <machine/bus.h>
! 33:
! 34: #include <dev/pci/pcivar.h>
! 35: #include <dev/pci/pcidevs.h>
! 36:
! 37: #include <arch/i386/pci/geodescreg.h>
! 38:
! 39: struct geodesc_softc {
! 40: struct device sc_dev;
! 41: bus_space_tag_t sc_iot;
! 42: bus_space_handle_t sc_ioh;
! 43: };
! 44:
! 45: int geodesc_match(struct device *, void *, void *);
! 46: void geodesc_attach(struct device *, struct device *, void *);
! 47: void sc1100_sysreset(void);
! 48:
! 49: #ifndef SMALL_KERNEL
! 50: int geodesc_wdogctl_cb(void *, int);
! 51: #endif /* SMALL_KERNEL */
! 52:
! 53: struct cfattach geodesc_ca = {
! 54: sizeof(struct geodesc_softc), geodesc_match, geodesc_attach
! 55: };
! 56:
! 57: struct cfdriver geodesc_cd = {
! 58: NULL, "geodesc", DV_DULL
! 59: };
! 60:
! 61: #ifdef __HAVE_TIMECOUNTER
! 62: u_int geodesc_get_timecount(struct timecounter *tc);
! 63:
! 64: struct timecounter geodesc_timecounter = {
! 65: geodesc_get_timecount, /* get_timecount */
! 66: 0, /* no poll_pps */
! 67: 0xffffffff, /* counter_mask */
! 68: 27000000, /* frequency */
! 69: "GEOTSC", /* name */
! 70: 2000 /* quality */
! 71: };
! 72: #endif /* __HAVE_TIMECOUNTER */
! 73:
! 74: int
! 75: geodesc_match(struct device *parent, void *match, void *aux)
! 76: {
! 77: struct pci_attach_args *pa = aux;
! 78:
! 79: if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NS &&
! 80: (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NS_SC1100_XBUS ||
! 81: PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NS_SCx200_XBUS))
! 82: return (1);
! 83: return (0);
! 84: }
! 85:
! 86: #define WDSTSBITS "\20\x04WDRST\x03WDSMI\x02WDINT\x01WDOVF"
! 87:
! 88: void
! 89: geodesc_attach(struct device *parent, struct device *self, void *aux)
! 90: {
! 91: struct geodesc_softc *sc = (void *) self;
! 92: struct pci_attach_args *pa = aux;
! 93: uint16_t cnfg, cba;
! 94: uint8_t sts, rev, iid;
! 95: pcireg_t reg;
! 96: extern void (*cpuresetfn)(void);
! 97:
! 98: reg = pci_conf_read(pa->pa_pc, pa->pa_tag, SC1100_F5_SCRATCHPAD);
! 99: sc->sc_iot = pa->pa_iot;
! 100: if (reg == 0 ||
! 101: bus_space_map(sc->sc_iot, reg, 64, 0, &sc->sc_ioh)) {
! 102: printf(": unable to map registers at 0x%x\n", reg);
! 103: return;
! 104: }
! 105: cba = bus_space_read_2(sc->sc_iot, sc->sc_ioh, GCB_CBA);
! 106: if (cba != reg) {
! 107: printf(": cba mismatch: cba 0x%x != reg 0x%x\n", cba, reg);
! 108: bus_space_unmap(sc->sc_iot, sc->sc_ioh, 64);
! 109: return;
! 110: }
! 111: sts = bus_space_read_1(sc->sc_iot, sc->sc_ioh, GCB_WDSTS);
! 112: cnfg = bus_space_read_2(sc->sc_iot, sc->sc_ioh, GCB_WDCNFG);
! 113: iid = bus_space_read_1(sc->sc_iot, sc->sc_ioh, GCB_IID);
! 114: rev = bus_space_read_1(sc->sc_iot, sc->sc_ioh, GCB_REV);
! 115:
! 116: printf(": iid %d revision %d wdstatus %b\n", iid, rev, sts, WDSTSBITS);
! 117:
! 118: #ifndef SMALL_KERNEL
! 119: /* setup and register watchdog */
! 120: bus_space_write_2(sc->sc_iot, sc->sc_ioh, GCB_WDTO, 0);
! 121: sts |= WDOVF_CLEAR;
! 122: bus_space_write_1(sc->sc_iot, sc->sc_ioh, GCB_WDSTS, sts);
! 123: cnfg &= ~WDCNFG_MASK;
! 124: cnfg |= WDTYPE1_RESET|WDPRES_DIV_512;
! 125: bus_space_write_2(sc->sc_iot, sc->sc_ioh, GCB_WDCNFG, cnfg);
! 126:
! 127: wdog_register(sc, geodesc_wdogctl_cb);
! 128: #endif /* SMALL_KERNEL */
! 129:
! 130: #ifdef __HAVE_TIMECOUNTER
! 131: bus_space_write_4(sc->sc_iot, sc->sc_ioh, GCB_TSCNFG, TSC_ENABLE);
! 132: /* Hook into the kern_tc */
! 133: geodesc_timecounter.tc_priv = sc;
! 134: tc_init(&geodesc_timecounter);
! 135: #endif /* __HAVE_TIMECOUNTER */
! 136:
! 137: /* We have a special way to reset the CPU on the SC1100 */
! 138: cpuresetfn = sc1100_sysreset;
! 139: }
! 140:
! 141: #ifndef SMALL_KERNEL
! 142: int
! 143: geodesc_wdogctl_cb(void *self, int period)
! 144: {
! 145: struct geodesc_softc *sc = self;
! 146:
! 147: if (period > 0x03ff)
! 148: period = 0x03ff;
! 149: bus_space_write_2(sc->sc_iot, sc->sc_ioh, GCB_WDTO, period * 64);
! 150: return (period);
! 151: }
! 152: #endif /* SMALL_KERNEL */
! 153:
! 154: #ifdef __HAVE_TIMECOUNTER
! 155: u_int
! 156: geodesc_get_timecount(struct timecounter *tc)
! 157: {
! 158: struct geodesc_softc *sc = tc->tc_priv;
! 159:
! 160: return (bus_space_read_4(sc->sc_iot, sc->sc_ioh, GCB_TSC));
! 161: }
! 162: #endif /* __HAVE_TIMECOUNTER */
! 163:
! 164: void
! 165: sc1100_sysreset(void)
! 166: {
! 167: /*
! 168: * Reset AMD Geode SC1100.
! 169: *
! 170: * 1) Write PCI Configuration Address Register (0xcf8) to
! 171: * select Function 0, Register 0x44: Bridge Configuration,
! 172: * GPIO and LPC Configuration Register Space, Reset
! 173: * Control Register.
! 174: *
! 175: * 2) Write 0xf to PCI Configuration Data Register (0xcfc)
! 176: * to reset IDE controller, IDE bus, and PCI bus, and
! 177: * to trigger a system-wide reset.
! 178: *
! 179: * See AMD Geode SC1100 Processor Data Book, Revision 2.0,
! 180: * sections 6.3.1, 6.3.2, and 6.4.1.
! 181: */
! 182: outl(0xCF8, 0x80009044UL);
! 183: outb(0xCFC, 0x0F);
! 184: }
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