exynos_rtc.c revision 1.2.18.2
1 1.2.18.2 jdolecek /* $NetBSD: exynos_rtc.c,v 1.2.18.2 2017/12/03 11:35:56 jdolecek Exp $ */ 2 1.2.18.2 jdolecek 3 1.2.18.2 jdolecek /*- 4 1.2.18.2 jdolecek * Copyright (c) 2015 The NetBSD Foundation, Inc. 5 1.2.18.2 jdolecek * All rights reserved. 6 1.2.18.2 jdolecek * 7 1.2.18.2 jdolecek * This code is derived from software contributed to The NetBSD Foundation 8 1.2.18.2 jdolecek * by Marty Fouts 9 1.2.18.2 jdolecek * 10 1.2.18.2 jdolecek * Redistribution and use in source and binary forms, with or without 11 1.2.18.2 jdolecek * modification, are permitted provided that the following conditions 12 1.2.18.2 jdolecek * are met: 13 1.2.18.2 jdolecek * 1. Redistributions of source code must retain the above copyright 14 1.2.18.2 jdolecek * notice, this list of conditions and the following disclaimer. 15 1.2.18.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.18.2 jdolecek * notice, this list of conditions and the following disclaimer in the 17 1.2.18.2 jdolecek * documentation and/or other materials provided with the distribution. 18 1.2.18.2 jdolecek * 19 1.2.18.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2.18.2 jdolecek * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2.18.2 jdolecek * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2.18.2 jdolecek * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2.18.2 jdolecek * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2.18.2 jdolecek * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2.18.2 jdolecek * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2.18.2 jdolecek * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2.18.2 jdolecek * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2.18.2 jdolecek * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2.18.2 jdolecek * POSSIBILITY OF SUCH DAMAGE. 30 1.2.18.2 jdolecek */ 31 1.2.18.2 jdolecek 32 1.2.18.2 jdolecek #include "opt_exynos.h" 33 1.2.18.2 jdolecek #include "opt_arm_debug.h" 34 1.2.18.2 jdolecek #include "gpio.h" 35 1.2.18.2 jdolecek 36 1.2.18.2 jdolecek #include <sys/cdefs.h> 37 1.2.18.2 jdolecek __KERNEL_RCSID(1, "$NetBSD: exynos_rtc.c,v 1.2.18.2 2017/12/03 11:35:56 jdolecek Exp $"); 38 1.2.18.2 jdolecek 39 1.2.18.2 jdolecek #include <sys/param.h> 40 1.2.18.2 jdolecek #include <sys/bus.h> 41 1.2.18.2 jdolecek #include <sys/device.h> 42 1.2.18.2 jdolecek #include <sys/intr.h> 43 1.2.18.2 jdolecek #include <sys/systm.h> 44 1.2.18.2 jdolecek #include <sys/kernel.h> 45 1.2.18.2 jdolecek #include <sys/kmem.h> 46 1.2.18.2 jdolecek 47 1.2.18.2 jdolecek #include <dev/clock_subr.h> 48 1.2.18.2 jdolecek 49 1.2.18.2 jdolecek #include <arm/samsung/exynos_reg.h> 50 1.2.18.2 jdolecek #include <arm/samsung/exynos_intr.h> 51 1.2.18.2 jdolecek 52 1.2.18.2 jdolecek #include <dev/fdt/fdtvar.h> 53 1.2.18.2 jdolecek 54 1.2.18.2 jdolecek struct exynos_rtc_softc { 55 1.2.18.2 jdolecek device_t sc_dev; 56 1.2.18.2 jdolecek bus_space_tag_t sc_bst; 57 1.2.18.2 jdolecek bus_space_handle_t sc_bsh; 58 1.2.18.2 jdolecek 59 1.2.18.2 jdolecek struct todr_chip_handle sc_todr; 60 1.2.18.2 jdolecek }; 61 1.2.18.2 jdolecek 62 1.2.18.2 jdolecek static int exynos_rtc_match(device_t, cfdata_t, void *); 63 1.2.18.2 jdolecek static void exynos_rtc_attach(device_t, device_t, void *); 64 1.2.18.2 jdolecek 65 1.2.18.2 jdolecek static int exynos_rtc_gettime(todr_chip_handle_t, struct timeval *); 66 1.2.18.2 jdolecek static int exynos_rtc_settime(todr_chip_handle_t, struct timeval *); 67 1.2.18.2 jdolecek 68 1.2.18.2 jdolecek CFATTACH_DECL_NEW(exynos_rtc, sizeof(struct exynos_rtc_softc), 69 1.2.18.2 jdolecek exynos_rtc_match, exynos_rtc_attach, NULL, NULL); 70 1.2.18.2 jdolecek 71 1.2.18.2 jdolecek #define RTC_READ(sc, reg) \ 72 1.2.18.2 jdolecek bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg)) 73 1.2.18.2 jdolecek #define RTC_WRITE(sc, reg, val) \ 74 1.2.18.2 jdolecek bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val)) 75 1.2.18.2 jdolecek 76 1.2.18.2 jdolecek static int 77 1.2.18.2 jdolecek exynos_rtc_match(device_t parent, cfdata_t cf, void *aux) 78 1.2.18.2 jdolecek { 79 1.2.18.2 jdolecek const char * const compatible[] = { "samsung,s3c6410-rtc", 80 1.2.18.2 jdolecek NULL }; 81 1.2.18.2 jdolecek struct fdt_attach_args * const faa = aux; 82 1.2.18.2 jdolecek return of_match_compatible(faa->faa_phandle, compatible); 83 1.2.18.2 jdolecek } 84 1.2.18.2 jdolecek 85 1.2.18.2 jdolecek static void 86 1.2.18.2 jdolecek exynos_rtc_attach(device_t parent, device_t self, void *aux) 87 1.2.18.2 jdolecek { 88 1.2.18.2 jdolecek struct exynos_rtc_softc * const sc 89 1.2.18.2 jdolecek = kmem_zalloc(sizeof(*sc), KM_SLEEP); 90 1.2.18.2 jdolecek struct fdt_attach_args * const faa = aux; 91 1.2.18.2 jdolecek bus_addr_t addr; 92 1.2.18.2 jdolecek bus_size_t size; 93 1.2.18.2 jdolecek int error; 94 1.2.18.2 jdolecek 95 1.2.18.2 jdolecek if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) { 96 1.2.18.2 jdolecek aprint_error(": couldn't get registers\n"); 97 1.2.18.2 jdolecek return; 98 1.2.18.2 jdolecek } 99 1.2.18.2 jdolecek 100 1.2.18.2 jdolecek aprint_normal(" @ 0x%08x", (uint)addr); 101 1.2.18.2 jdolecek sc->sc_dev = self; 102 1.2.18.2 jdolecek sc->sc_bst = faa->faa_bst; 103 1.2.18.2 jdolecek error = bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh); 104 1.2.18.2 jdolecek if (error) { 105 1.2.18.2 jdolecek aprint_error(": couldn't map %#llx: %d", 106 1.2.18.2 jdolecek (uint64_t)addr, error); 107 1.2.18.2 jdolecek return; 108 1.2.18.2 jdolecek } 109 1.2.18.2 jdolecek 110 1.2.18.2 jdolecek aprint_naive("\n"); 111 1.2.18.2 jdolecek aprint_normal(": RTC\n"); 112 1.2.18.2 jdolecek 113 1.2.18.2 jdolecek sc->sc_todr.todr_gettime = exynos_rtc_gettime; 114 1.2.18.2 jdolecek sc->sc_todr.todr_settime = exynos_rtc_settime; 115 1.2.18.2 jdolecek sc->sc_todr.cookie = sc; 116 1.2.18.2 jdolecek todr_attach(&sc->sc_todr); 117 1.2.18.2 jdolecek 118 1.2.18.2 jdolecek } 119 1.2.18.2 jdolecek 120 1.2.18.2 jdolecek static int 121 1.2.18.2 jdolecek exynos_rtc_gettime(todr_chip_handle_t tch, struct timeval *tv) 122 1.2.18.2 jdolecek { 123 1.2.18.2 jdolecek struct exynos_rtc_softc * const sc = tch->cookie; 124 1.2.18.2 jdolecek 125 1.2.18.2 jdolecek tv->tv_sec = RTC_READ(sc, EXYNOS5_RTC_OFFSET); 126 1.2.18.2 jdolecek tv->tv_usec = 0; 127 1.2.18.2 jdolecek 128 1.2.18.2 jdolecek return 0; 129 1.2.18.2 jdolecek } 130 1.2.18.2 jdolecek 131 1.2.18.2 jdolecek static int 132 1.2.18.2 jdolecek exynos_rtc_settime(todr_chip_handle_t tch, struct timeval *tv) 133 1.2.18.2 jdolecek { 134 1.2.18.2 jdolecek struct exynos_rtc_softc * const sc = tch->cookie; 135 1.2.18.2 jdolecek int retry = 500; 136 1.2.18.2 jdolecek 137 1.2.18.2 jdolecek while (--retry > 0) { 138 1.2.18.2 jdolecek if (!RTC_READ(sc, EXYNOS5_RTC_OFFSET)) 139 1.2.18.2 jdolecek break; 140 1.2.18.2 jdolecek delay(1); 141 1.2.18.2 jdolecek } 142 1.2.18.2 jdolecek if (retry == 0) { 143 1.2.18.2 jdolecek device_printf(sc->sc_dev, "RTC write failed (BUSY)\n"); 144 1.2.18.2 jdolecek return ETIMEDOUT; 145 1.2.18.2 jdolecek } 146 1.2.18.2 jdolecek 147 1.2.18.2 jdolecek RTC_WRITE(sc, EXYNOS5_RTC_OFFSET, tv->tv_sec); 148 1.2.18.2 jdolecek 149 1.2.18.2 jdolecek return 0; 150 1.2.18.2 jdolecek } 151
Indexes created Sat Oct 25 16:10:12 GMT 2025