1 /* $NetBSD: gfrtc_mainbus.c,v 1.2 2024/01/12 06:23:20 mlelstv Exp $ */ 2 3 /*- 4 * Copyright (c) 2023, 2024 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Nick Hudson and by Jason R. Thorpe. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: gfrtc_mainbus.c,v 1.2 2024/01/12 06:23:20 mlelstv Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/bus.h> 37 #include <sys/device.h> 38 #include <sys/intr.h> 39 #include <sys/systm.h> 40 41 #include <machine/clockvar.h> 42 43 #include <virt68k/dev/mainbusvar.h> 44 45 #include <dev/goldfish/gfrtcvar.h> 46 47 static const struct device_compatible_entry compat_data[] = { 48 { .compat = "google,goldfish-rtc", 49 .value = CLOCK_NONE }, 50 51 { .compat = "netbsd,goldfish-rtc-hardclock", 52 .value = CLOCK_HARDCLOCK }, 53 54 DEVICE_COMPAT_EOL 55 }; 56 57 struct gfrtc_mainbus_softc { 58 struct gfrtc_softc sc_gfrtc; 59 struct clock_attach_args sc_clock_args; 60 uint64_t sc_interval_ns; 61 void (*sc_handler)(struct clockframe *); 62 struct evcnt * sc_evcnt; 63 void * sc_ih; 64 }; 65 66 #define CLOCK_HANDLER() \ 67 do { \ 68 /* Clear the interrupt condition. */ \ 69 gfrtc_clear_interrupt(&sc->sc_gfrtc); \ 70 \ 71 /* Get the next alarm set ASAP. */ \ 72 gfrtc_set_alarm(&sc->sc_gfrtc, sc->sc_interval_ns); \ 73 \ 74 /* Increment the counter and call the handler. */ \ 75 sc->sc_evcnt->ev_count++; \ 76 sc->sc_handler((struct clockframe *)v); \ 77 } while (/*CONSTCOND*/0) 78 79 static int 80 gfrtc_mainbus_hardclock(void *v) 81 { 82 struct gfrtc_mainbus_softc *sc = clock_devices[CLOCK_HARDCLOCK]; 83 84 CLOCK_HANDLER(); 85 return 1; 86 } 87 88 static void *gfrtc_isrs[] = { 89 [CLOCK_HARDCLOCK] = gfrtc_mainbus_hardclock, 90 }; 91 92 static void 93 gfrtc_mainbus_initclock(void *arg, unsigned int interval_us, 94 struct evcnt *ev, void (*func)(struct clockframe *)) 95 { 96 struct gfrtc_mainbus_softc *sc = arg; 97 98 sc->sc_interval_ns = (uint64_t)interval_us * 1000; 99 sc->sc_handler = func; 100 sc->sc_evcnt = ev; 101 102 /* Enable the interrupt. */ 103 gfrtc_enable_interrupt(&sc->sc_gfrtc); 104 105 /* Start the first alarm! */ 106 gfrtc_set_alarm(&sc->sc_gfrtc, sc->sc_interval_ns); 107 } 108 109 static int 110 gfrtc_mainbus_match(device_t parent, cfdata_t cf, void *aux) 111 { 112 struct mainbus_attach_args * const ma = aux; 113 114 return mainbus_compatible_match(ma, compat_data); 115 } 116 117 static void 118 gfrtc_mainbus_attach(device_t parent, device_t self, void *aux) 119 { 120 struct gfrtc_mainbus_softc * const sc = device_private(self); 121 struct mainbus_attach_args * const ma = aux; 122 const struct device_compatible_entry *dce; 123 char strbuf[INTR_STRING_BUFSIZE]; 124 125 sc->sc_gfrtc.sc_dev = self; 126 sc->sc_gfrtc.sc_bst = ma->ma_st; 127 if (bus_space_map(sc->sc_gfrtc.sc_bst, ma->ma_addr, ma->ma_size, 0, 128 &sc->sc_gfrtc.sc_bsh) != 0) { 129 aprint_error(": couldn't map registers\n"); 130 return; 131 } 132 133 dce = mainbus_compatible_lookup(ma, compat_data); 134 KASSERT(dce != NULL); 135 136 gfrtc_attach(&sc->sc_gfrtc, (dce->value == CLOCK_NONE)); 137 138 switch (dce->value) { 139 case CLOCK_HARDCLOCK: 140 /* 141 * We are the one of the clock interrupts. 142 */ 143 sc->sc_ih = intr_establish(gfrtc_isrs[(int)dce->value], 144 NULL, ma->ma_irq, IPL_SCHED, 0); 145 KASSERT(sc->sc_ih != NULL); 146 aprint_normal_dev(self, "%s interrupting at %s\n", 147 clock_name((int)dce->value), 148 intr_string(sc->sc_ih, strbuf, sizeof(strbuf))); 149 sc->sc_clock_args.ca_initfunc = gfrtc_mainbus_initclock; 150 sc->sc_clock_args.ca_arg = sc; 151 sc->sc_clock_args.ca_which = (int)dce->value; 152 clock_attach(self, &sc->sc_clock_args, gfrtc_delay); 153 break; 154 155 default: 156 break; 157 } 158 } 159 160 CFATTACH_DECL_NEW(gfrtc_mainbus, sizeof(struct gfrtc_mainbus_softc), 161 gfrtc_mainbus_match, gfrtc_mainbus_attach, NULL, NULL); 162