1 /* $OpenBSD: gscpm.c,v 1.14 2023/02/04 19:19:36 cheloha Exp $ */ 2 /* 3 * Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 /* 19 * National Semiconductor Geode SC1100 SMI/ACPI module. 20 */ 21 22 #include <sys/param.h> 23 #include <sys/systm.h> 24 #include <sys/device.h> 25 #include <sys/kernel.h> 26 #include <sys/timetc.h> 27 28 #include <machine/bus.h> 29 30 #include <dev/pci/pcireg.h> 31 #include <dev/pci/pcivar.h> 32 #include <dev/pci/pcidevs.h> 33 34 #include <i386/pci/gscpmreg.h> 35 36 struct gscpm_softc { 37 struct device sc_dev; 38 39 pci_chipset_tag_t sc_pc; 40 pcitag_t sc_tag; 41 bus_space_tag_t sc_iot; 42 bus_space_handle_t sc_acpi_ioh; 43 }; 44 45 int gscpm_match(struct device *, void *, void *); 46 void gscpm_attach(struct device *, struct device *, void *); 47 48 void gscpm_setperf(int); 49 50 u_int gscpm_get_timecount(struct timecounter *tc); 51 52 struct timecounter gscpm_timecounter = { 53 .tc_get_timecount = gscpm_get_timecount, 54 .tc_counter_mask = 0xffffff, 55 .tc_frequency = 3579545, 56 .tc_name = "GSCPM", 57 .tc_quality = 1000, 58 .tc_priv = NULL, 59 .tc_user = 0, 60 }; 61 62 const struct cfattach gscpm_ca = { 63 sizeof (struct gscpm_softc), 64 gscpm_match, 65 gscpm_attach 66 }; 67 68 struct cfdriver gscpm_cd = { 69 NULL, "gscpm", DV_DULL 70 }; 71 72 #if 0 73 static void *gscpm_cookie; /* XXX */ 74 #endif 75 76 int 77 gscpm_match(struct device *parent, void *match, void *aux) 78 { 79 struct pci_attach_args *pa = aux; 80 81 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NS && 82 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NS_SC1100_SMI) 83 return (1); 84 85 return (0); 86 } 87 88 void 89 gscpm_attach(struct device *parent, struct device *self, void *aux) 90 { 91 struct gscpm_softc *sc = (struct gscpm_softc *)self; 92 struct pci_attach_args *pa = aux; 93 pcireg_t csr, acpibase; 94 95 sc->sc_pc = pa->pa_pc; 96 sc->sc_tag = pa->pa_tag; 97 sc->sc_iot = pa->pa_iot; 98 99 /* Enable I/O space */ 100 csr = pci_conf_read(sc->sc_pc, sc->sc_tag, PCI_COMMAND_STATUS_REG); 101 pci_conf_write(sc->sc_pc, sc->sc_tag, PCI_COMMAND_STATUS_REG, 102 csr | PCI_COMMAND_IO_ENABLE); 103 104 /* Map ACPI registers */ 105 acpibase = pci_conf_read(sc->sc_pc, sc->sc_tag, GSCPM_ACPIBASE); 106 if (PCI_MAPREG_IO_ADDR(acpibase) == 0 || 107 bus_space_map(sc->sc_iot, PCI_MAPREG_IO_ADDR(acpibase), 108 GSCPM_ACPISIZE, 0, &sc->sc_acpi_ioh)) { 109 printf(": failed to map ACPI registers\n"); 110 return; 111 } 112 113 printf("\n"); 114 115 /* Hook into the kern_tc */ 116 gscpm_timecounter.tc_priv = sc; 117 tc_init(&gscpm_timecounter); 118 119 /* XXX: disabled due to unresolved yet hardware errata */ 120 #if 0 121 /* Hook into the hw.setperf sysctl */ 122 gscpm_cookie = sc; 123 cpu_setperf = gscpm_setperf; 124 #endif 125 126 } 127 128 u_int 129 gscpm_get_timecount(struct timecounter *tc) 130 { 131 struct gscpm_softc *sc = tc->tc_priv; 132 133 return (bus_space_read_4(sc->sc_iot, sc->sc_acpi_ioh, GSCPM_PM_TMR)); 134 } 135 136 #if 0 137 void 138 gscpm_setperf(int level) 139 { 140 struct gscpm_softc *sc = gscpm_cookie; 141 int i; 142 u_int32_t pctl; 143 144 pctl = bus_space_read_4(sc->sc_iot, sc->sc_acpi_ioh, GSCPM_P_CNT); 145 146 if (level == 100) { 147 /* 100 is a maximum performance, disable throttling */ 148 pctl &= ~GSCPM_P_CNT_THTEN; 149 } else { 150 for (i = 0; i < GSCPM_THT_LEVELS; i++) 151 if (level >= gscpm_tht[i].level) 152 break; 153 pctl = (0xf0 | GSCPM_P_CNT_THTEN | 154 GSCPM_P_CNT_CLK(gscpm_tht[i].value)); 155 } 156 157 /* Update processor control register */ 158 bus_space_write_4(sc->sc_iot, sc->sc_acpi_ioh, GSCPM_P_CNT, pctl); 159 } 160 #endif 161