1 /* $OpenBSD: pluart_acpi.c,v 1.3 2018/08/25 09:39:20 kettenis Exp $ */ 2 /* 3 * Copyright (c) 2018 Mark Kettenis 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 #include <sys/param.h> 19 #include <sys/malloc.h> 20 #include <sys/systm.h> 21 #include <sys/tty.h> 22 23 #include <dev/acpi/acpireg.h> 24 #include <dev/acpi/acpivar.h> 25 #include <dev/acpi/acpidev.h> 26 #include <dev/acpi/amltypes.h> 27 #include <dev/acpi/dsdt.h> 28 29 #undef DEVNAME 30 #include <dev/ic/pluartvar.h> 31 #include <dev/cons.h> 32 33 struct pluart_acpi_softc { 34 struct pluart_softc sc; 35 struct acpi_softc *sc_acpi; 36 struct aml_node *sc_node; 37 38 bus_addr_t sc_addr; 39 bus_size_t sc_size; 40 41 int sc_irq; 42 int sc_irq_flags; 43 void *sc_ih; 44 }; 45 46 int pluart_acpi_match(struct device *, void *, void *); 47 void pluart_acpi_attach(struct device *, struct device *, void *); 48 49 struct cfattach pluart_acpi_ca = { 50 sizeof(struct pluart_acpi_softc), pluart_acpi_match, pluart_acpi_attach 51 }; 52 53 const char *pluart_hids[] = { 54 "ARMH0011", 55 NULL 56 }; 57 58 int pluart_acpi_parse_resources(int, union acpi_resource *, void *); 59 int pluart_acpi_is_console(struct pluart_acpi_softc *); 60 61 int 62 pluart_acpi_match(struct device *parent, void *match, void *aux) 63 { 64 struct acpi_attach_args *aaa = aux; 65 struct cfdata *cf = match; 66 67 return acpi_matchhids(aaa, pluart_hids, cf->cf_driver->cd_name); 68 } 69 70 void 71 pluart_acpi_attach(struct device *parent, struct device *self, void *aux) 72 { 73 struct acpi_attach_args *aaa = aux; 74 struct pluart_acpi_softc *sc = (struct pluart_acpi_softc *)self; 75 struct aml_value res; 76 77 sc->sc_acpi = (struct acpi_softc *)parent; 78 sc->sc_node = aaa->aaa_node; 79 printf(" %s", sc->sc_node->name); 80 81 if (aml_evalname(sc->sc_acpi, sc->sc_node, "_CRS", 0, NULL, &res)) { 82 printf(": can't find registers\n"); 83 return; 84 } 85 86 aml_parse_resource(&res, pluart_acpi_parse_resources, sc); 87 printf(" addr 0x%lx/0x%lx", sc->sc_addr, sc->sc_size); 88 if (sc->sc_addr == 0 || sc->sc_size == 0) { 89 printf("\n"); 90 return; 91 } 92 93 printf(" irq %d", sc->sc_irq); 94 95 sc->sc.sc_iot = aaa->aaa_memt; 96 if (bus_space_map(sc->sc.sc_iot, sc->sc_addr, sc->sc_size, 0, 97 &sc->sc.sc_ioh)) { 98 printf(": can't map registers\n"); 99 return; 100 } 101 102 sc->sc_ih = acpi_intr_establish(sc->sc_irq, sc->sc_irq_flags, IPL_TTY, 103 pluart_intr, sc, sc->sc.sc_dev.dv_xname); 104 if (sc->sc_ih == NULL) { 105 printf(": can't establish interrupt\n"); 106 return; 107 } 108 109 pluart_attach_common(&sc->sc, pluart_acpi_is_console(sc)); 110 } 111 112 int 113 pluart_acpi_parse_resources(int crsidx, union acpi_resource *crs, void *arg) 114 { 115 struct pluart_acpi_softc *sc = arg; 116 int type = AML_CRSTYPE(crs); 117 118 switch (type) { 119 case LR_MEM32FIXED: 120 sc->sc_addr = crs->lr_m32fixed._bas; 121 sc->sc_size = crs->lr_m32fixed._len; 122 break; 123 case LR_EXTIRQ: 124 sc->sc_irq = crs->lr_extirq.irq[0]; 125 sc->sc_irq_flags = crs->lr_extirq.flags; 126 break; 127 } 128 129 return 0; 130 } 131 132 int 133 pluart_acpi_is_console(struct pluart_acpi_softc *sc) 134 { 135 struct acpi_table_header *hdr; 136 struct acpi_spcr *spcr; 137 struct acpi_gas *base; 138 struct acpi_q *entry; 139 140 SIMPLEQ_FOREACH(entry, &sc->sc_acpi->sc_tables, q_next) { 141 hdr = entry->q_table; 142 if (strncmp(hdr->signature, SPCR_SIG, 143 sizeof(hdr->signature)) == 0) { 144 spcr = entry->q_table; 145 base = &spcr->base_address; 146 if (base->address_space_id == GAS_SYSTEM_MEMORY && 147 base->address == sc->sc_addr) 148 return 1; 149 } 150 } 151 152 return 0; 153 } 154