meson_rtc.c revision 1.2.2.2
1 1.2.2.2 pgoyette /* $NetBSD: meson_rtc.c,v 1.2.2.2 2019/01/26 21:59:59 pgoyette Exp $ */ 2 1.2.2.2 pgoyette 3 1.2.2.2 pgoyette /*- 4 1.2.2.2 pgoyette * Copyright (c) 2015 The NetBSD Foundation, Inc. 5 1.2.2.2 pgoyette * All rights reserved. 6 1.2.2.2 pgoyette * 7 1.2.2.2 pgoyette * Redistribution and use in source and binary forms, with or without 8 1.2.2.2 pgoyette * modification, are permitted provided that the following conditions 9 1.2.2.2 pgoyette * are met: 10 1.2.2.2 pgoyette * 1. Redistributions of source code must retain the above copyright 11 1.2.2.2 pgoyette * notice, this list of conditions and the following disclaimer. 12 1.2.2.2 pgoyette * 2. Redistributions in binary form must reproduce the above copyright 13 1.2.2.2 pgoyette * notice, this list of conditions and the following disclaimer in the 14 1.2.2.2 pgoyette * documentation and/or other materials provided with the distribution. 15 1.2.2.2 pgoyette * 16 1.2.2.2 pgoyette * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.2.2.2 pgoyette * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.2.2.2 pgoyette * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.2.2.2 pgoyette * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.2.2.2 pgoyette * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.2.2.2 pgoyette * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.2.2.2 pgoyette * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.2.2.2 pgoyette * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.2.2.2 pgoyette * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.2.2.2 pgoyette * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.2.2.2 pgoyette * POSSIBILITY OF SUCH DAMAGE. 27 1.2.2.2 pgoyette */ 28 1.2.2.2 pgoyette 29 1.2.2.2 pgoyette #include <sys/cdefs.h> 30 1.2.2.2 pgoyette __KERNEL_RCSID(0, "$NetBSD: meson_rtc.c,v 1.2.2.2 2019/01/26 21:59:59 pgoyette Exp $"); 31 1.2.2.2 pgoyette 32 1.2.2.2 pgoyette #include <sys/param.h> 33 1.2.2.2 pgoyette #include <sys/atomic.h> 34 1.2.2.2 pgoyette #include <sys/device.h> 35 1.2.2.2 pgoyette #include <sys/kernel.h> 36 1.2.2.2 pgoyette #include <sys/systm.h> 37 1.2.2.2 pgoyette 38 1.2.2.2 pgoyette #include <dev/clock_subr.h> 39 1.2.2.2 pgoyette 40 1.2.2.2 pgoyette #include <arm/amlogic/meson_rtcreg.h> 41 1.2.2.2 pgoyette 42 1.2.2.2 pgoyette #include <dev/fdt/fdtvar.h> 43 1.2.2.2 pgoyette 44 1.2.2.2 pgoyette #define RESET_RETRY_TIMES 3 45 1.2.2.2 pgoyette #define RTC_COMM_DELAY 5 46 1.2.2.2 pgoyette #define RTC_RESET_DELAY 100 47 1.2.2.2 pgoyette #define RTC_STATIC_VALUE_INIT 0x180a /* XXX: MAGIC? */ 48 1.2.2.2 pgoyette 49 1.2.2.2 pgoyette struct meson_rtc_softc { 50 1.2.2.2 pgoyette device_t sc_dev; 51 1.2.2.2 pgoyette bus_space_tag_t sc_bst; 52 1.2.2.2 pgoyette bus_space_handle_t sc_bsh; 53 1.2.2.2 pgoyette struct todr_chip_handle sc_todr; 54 1.2.2.2 pgoyette int sc_osc_failed; 55 1.2.2.2 pgoyette unsigned int sc_busy; 56 1.2.2.2 pgoyette }; 57 1.2.2.2 pgoyette 58 1.2.2.2 pgoyette static const char * const compatible[] = { 59 1.2.2.2 pgoyette "amlogic,meson8b-rtc", 60 1.2.2.2 pgoyette NULL 61 1.2.2.2 pgoyette }; 62 1.2.2.2 pgoyette 63 1.2.2.2 pgoyette static int meson_rtc_match(device_t, cfdata_t, void *); 64 1.2.2.2 pgoyette static void meson_rtc_attach(device_t, device_t, void *); 65 1.2.2.2 pgoyette static int meson_rtc_todr_gettime(todr_chip_handle_t, struct timeval *); 66 1.2.2.2 pgoyette static int meson_rtc_todr_settime(todr_chip_handle_t, struct timeval *); 67 1.2.2.2 pgoyette 68 1.2.2.2 pgoyette CFATTACH_DECL_NEW(meson_rtc, sizeof(struct meson_rtc_softc), 69 1.2.2.2 pgoyette meson_rtc_match, meson_rtc_attach, NULL, NULL); 70 1.2.2.2 pgoyette 71 1.2.2.2 pgoyette #define RTC_WRITE(sc, reg, val) \ 72 1.2.2.2 pgoyette bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val)) 73 1.2.2.2 pgoyette #define RTC_READ(sc, reg) \ 74 1.2.2.2 pgoyette bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg)) 75 1.2.2.2 pgoyette 76 1.2.2.2 pgoyette static inline void 77 1.2.2.2 pgoyette setbits(struct meson_rtc_softc *sc, uint32_t reg, uint32_t bits) 78 1.2.2.2 pgoyette { 79 1.2.2.2 pgoyette 80 1.2.2.2 pgoyette RTC_WRITE(sc, reg, RTC_READ(sc, reg) | bits); 81 1.2.2.2 pgoyette } 82 1.2.2.2 pgoyette 83 1.2.2.2 pgoyette static inline void 84 1.2.2.2 pgoyette clrbits(struct meson_rtc_softc *sc, uint32_t reg, uint32_t bits) 85 1.2.2.2 pgoyette { 86 1.2.2.2 pgoyette 87 1.2.2.2 pgoyette RTC_WRITE(sc, reg, RTC_READ(sc, reg) & ~bits); 88 1.2.2.2 pgoyette } 89 1.2.2.2 pgoyette 90 1.2.2.2 pgoyette static int 91 1.2.2.2 pgoyette meson_rtc_check_osc_clk(struct meson_rtc_softc *sc) 92 1.2.2.2 pgoyette { 93 1.2.2.2 pgoyette uint32_t cnt1, cnt2; 94 1.2.2.2 pgoyette 95 1.2.2.2 pgoyette setbits(sc, AO_RTC_REG3, AO_RTC_REG3_COUNT_ALWAYS); 96 1.2.2.2 pgoyette 97 1.2.2.2 pgoyette /* 98 1.2.2.2 pgoyette * Wait for 50uS. 32.768khz is 30.5uS. This should be long 99 1.2.2.2 pgoyette * enough for one full cycle of 32.768 khz. 100 1.2.2.2 pgoyette */ 101 1.2.2.2 pgoyette cnt1 = RTC_READ(sc, AO_RTC_REG2); 102 1.2.2.2 pgoyette delay(50); 103 1.2.2.2 pgoyette cnt2 = RTC_READ(sc, AO_RTC_REG2); 104 1.2.2.2 pgoyette 105 1.2.2.2 pgoyette clrbits(sc, AO_RTC_REG3, AO_RTC_REG3_COUNT_ALWAYS); 106 1.2.2.2 pgoyette 107 1.2.2.2 pgoyette return cnt1 == cnt2; 108 1.2.2.2 pgoyette } 109 1.2.2.2 pgoyette 110 1.2.2.2 pgoyette static int 111 1.2.2.2 pgoyette meson_rtc_match(device_t parent, cfdata_t cf, void *aux) 112 1.2.2.2 pgoyette { 113 1.2.2.2 pgoyette struct fdt_attach_args * const faa = aux; 114 1.2.2.2 pgoyette 115 1.2.2.2 pgoyette return of_match_compatible(faa->faa_phandle, compatible); 116 1.2.2.2 pgoyette } 117 1.2.2.2 pgoyette 118 1.2.2.2 pgoyette static void 119 1.2.2.2 pgoyette meson_rtc_attach(device_t parent, device_t self, void *aux) 120 1.2.2.2 pgoyette { 121 1.2.2.2 pgoyette struct meson_rtc_softc * const sc = device_private(self); 122 1.2.2.2 pgoyette struct fdt_attach_args * const faa = aux; 123 1.2.2.2 pgoyette const int phandle = faa->faa_phandle; 124 1.2.2.2 pgoyette bus_addr_t addr; 125 1.2.2.2 pgoyette bus_size_t size; 126 1.2.2.2 pgoyette 127 1.2.2.2 pgoyette if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 128 1.2.2.2 pgoyette aprint_error(": couldn't map registers\n"); 129 1.2.2.2 pgoyette return; 130 1.2.2.2 pgoyette } 131 1.2.2.2 pgoyette 132 1.2.2.2 pgoyette sc->sc_dev = self; 133 1.2.2.2 pgoyette sc->sc_bst = faa->faa_bst; 134 1.2.2.2 pgoyette if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) { 135 1.2.2.2 pgoyette aprint_error(": couldn't map registers\n"); 136 1.2.2.2 pgoyette return; 137 1.2.2.2 pgoyette } 138 1.2.2.2 pgoyette 139 1.2.2.2 pgoyette sc->sc_osc_failed = meson_rtc_check_osc_clk(sc); 140 1.2.2.2 pgoyette 141 1.2.2.2 pgoyette memset(&sc->sc_todr, 0, sizeof(sc->sc_todr)); 142 1.2.2.2 pgoyette sc->sc_todr.cookie = sc; 143 1.2.2.2 pgoyette sc->sc_todr.todr_gettime = meson_rtc_todr_gettime; 144 1.2.2.2 pgoyette sc->sc_todr.todr_settime = meson_rtc_todr_settime; 145 1.2.2.2 pgoyette 146 1.2.2.2 pgoyette aprint_naive("\n"); 147 1.2.2.2 pgoyette aprint_normal(": RTC"); 148 1.2.2.2 pgoyette if (sc->sc_osc_failed) { 149 1.2.2.2 pgoyette aprint_normal(" battery not present or discharged\n"); 150 1.2.2.2 pgoyette } else { 151 1.2.2.2 pgoyette aprint_normal("\n"); 152 1.2.2.2 pgoyette fdtbus_todr_attach(self, phandle, &sc->sc_todr); 153 1.2.2.2 pgoyette } 154 1.2.2.2 pgoyette } 155 1.2.2.2 pgoyette 156 1.2.2.2 pgoyette static void 157 1.2.2.2 pgoyette meson_rtc_sclk_pulse(struct meson_rtc_softc *sc) 158 1.2.2.2 pgoyette { 159 1.2.2.2 pgoyette 160 1.2.2.2 pgoyette delay(RTC_COMM_DELAY); 161 1.2.2.2 pgoyette setbits(sc, AO_RTC_REG0, AO_RTC_REG0_SCLK); 162 1.2.2.2 pgoyette 163 1.2.2.2 pgoyette delay(RTC_COMM_DELAY); 164 1.2.2.2 pgoyette clrbits(sc, AO_RTC_REG0, AO_RTC_REG0_SCLK); 165 1.2.2.2 pgoyette } 166 1.2.2.2 pgoyette 167 1.2.2.2 pgoyette static void 168 1.2.2.2 pgoyette meson_rtc_send_bit(struct meson_rtc_softc *sc, uint32_t bitset) 169 1.2.2.2 pgoyette { 170 1.2.2.2 pgoyette 171 1.2.2.2 pgoyette if (bitset) 172 1.2.2.2 pgoyette setbits(sc, AO_RTC_REG0, AO_RTC_REG0_SDI); 173 1.2.2.2 pgoyette else 174 1.2.2.2 pgoyette clrbits(sc, AO_RTC_REG0, AO_RTC_REG0_SDI); 175 1.2.2.2 pgoyette 176 1.2.2.2 pgoyette meson_rtc_sclk_pulse(sc); 177 1.2.2.2 pgoyette } 178 1.2.2.2 pgoyette 179 1.2.2.2 pgoyette #define SERIAL_ADDR_BITS 3 180 1.2.2.2 pgoyette #define SERIAL_DATA_BITS 32 181 1.2.2.2 pgoyette #define SERIAL_TYPE_ADDR (1 << (SERIAL_ADDR_BITS - 1)) 182 1.2.2.2 pgoyette #define SERIAL_TYPE_DATA (1 << (SERIAL_DATA_BITS - 1)) 183 1.2.2.2 pgoyette 184 1.2.2.2 pgoyette static void 185 1.2.2.2 pgoyette meson_rtc_send_data(struct meson_rtc_softc *sc, 186 1.2.2.2 pgoyette uint32_t nextbit, uint32_t data) 187 1.2.2.2 pgoyette { 188 1.2.2.2 pgoyette 189 1.2.2.2 pgoyette KASSERT(nextbit == SERIAL_TYPE_ADDR || nextbit == SERIAL_TYPE_DATA); 190 1.2.2.2 pgoyette 191 1.2.2.2 pgoyette while (nextbit) { 192 1.2.2.2 pgoyette meson_rtc_send_bit(sc, data & nextbit); 193 1.2.2.2 pgoyette nextbit >>= 1; 194 1.2.2.2 pgoyette } 195 1.2.2.2 pgoyette } 196 1.2.2.2 pgoyette 197 1.2.2.2 pgoyette static uint32_t 198 1.2.2.2 pgoyette meson_rtc_get_data(struct meson_rtc_softc *sc) 199 1.2.2.2 pgoyette { 200 1.2.2.2 pgoyette uint32_t data; 201 1.2.2.2 pgoyette size_t i; 202 1.2.2.2 pgoyette 203 1.2.2.2 pgoyette data = 0; 204 1.2.2.2 pgoyette for (i = 0; i < SERIAL_DATA_BITS; i++) { 205 1.2.2.2 pgoyette meson_rtc_sclk_pulse(sc); 206 1.2.2.2 pgoyette data <<= 1; 207 1.2.2.2 pgoyette data |= __SHIFTOUT(RTC_READ(sc, AO_RTC_REG1), AO_RTC_REG1_SDO); 208 1.2.2.2 pgoyette } 209 1.2.2.2 pgoyette return data; 210 1.2.2.2 pgoyette } 211 1.2.2.2 pgoyette 212 1.2.2.2 pgoyette enum serial_mode { 213 1.2.2.2 pgoyette SERIAL_MODE_READ, 214 1.2.2.2 pgoyette SERIAL_MODE_WRITE, 215 1.2.2.2 pgoyette }; 216 1.2.2.2 pgoyette 217 1.2.2.2 pgoyette static void 218 1.2.2.2 pgoyette meson_rtc_set_mode(struct meson_rtc_softc *sc, enum serial_mode mode) 219 1.2.2.2 pgoyette { 220 1.2.2.2 pgoyette 221 1.2.2.2 pgoyette clrbits(sc, AO_RTC_REG0, AO_RTC_REG0_SEN); 222 1.2.2.2 pgoyette 223 1.2.2.2 pgoyette switch(mode) { 224 1.2.2.2 pgoyette case SERIAL_MODE_READ: 225 1.2.2.2 pgoyette clrbits(sc, AO_RTC_REG0, AO_RTC_REG0_SDI); 226 1.2.2.2 pgoyette break; 227 1.2.2.2 pgoyette case SERIAL_MODE_WRITE: 228 1.2.2.2 pgoyette setbits(sc, AO_RTC_REG0, AO_RTC_REG0_SDI); 229 1.2.2.2 pgoyette break; 230 1.2.2.2 pgoyette default: 231 1.2.2.2 pgoyette KASSERT(1); 232 1.2.2.2 pgoyette return; 233 1.2.2.2 pgoyette } 234 1.2.2.2 pgoyette meson_rtc_sclk_pulse(sc); 235 1.2.2.2 pgoyette 236 1.2.2.2 pgoyette clrbits(sc, AO_RTC_REG0, AO_RTC_REG0_SDI); 237 1.2.2.2 pgoyette } 238 1.2.2.2 pgoyette 239 1.2.2.2 pgoyette static int 240 1.2.2.2 pgoyette meson_rtc_wait_s_ready(struct meson_rtc_softc *sc) 241 1.2.2.2 pgoyette { 242 1.2.2.2 pgoyette size_t s_nrdy_cnt, retry_cnt; 243 1.2.2.2 pgoyette 244 1.2.2.2 pgoyette s_nrdy_cnt = 40000; 245 1.2.2.2 pgoyette retry_cnt = 0; 246 1.2.2.2 pgoyette while (!(RTC_READ(sc, AO_RTC_REG1) & AO_RTC_REG1_S_READY)) { 247 1.2.2.2 pgoyette if (s_nrdy_cnt-- == 0) { 248 1.2.2.2 pgoyette s_nrdy_cnt = 40000; 249 1.2.2.2 pgoyette if (retry_cnt++ == RESET_RETRY_TIMES) 250 1.2.2.2 pgoyette return 0; 251 1.2.2.2 pgoyette /* XXX: reset_s_ready? Linux does not. */ 252 1.2.2.2 pgoyette setbits(sc, AO_RTC_REG1, AO_RTC_REG1_S_READY); 253 1.2.2.2 pgoyette delay(RTC_RESET_DELAY); 254 1.2.2.2 pgoyette } 255 1.2.2.2 pgoyette } 256 1.2.2.2 pgoyette return 1; 257 1.2.2.2 pgoyette } 258 1.2.2.2 pgoyette 259 1.2.2.2 pgoyette static int 260 1.2.2.2 pgoyette meson_rtc_comm_init(struct meson_rtc_softc *sc) 261 1.2.2.2 pgoyette { 262 1.2.2.2 pgoyette 263 1.2.2.2 pgoyette clrbits(sc, AO_RTC_REG0, 264 1.2.2.2 pgoyette AO_RTC_REG0_SEN | AO_RTC_REG0_SCLK | AO_RTC_REG0_SDI); 265 1.2.2.2 pgoyette 266 1.2.2.2 pgoyette if (meson_rtc_wait_s_ready(sc)) { 267 1.2.2.2 pgoyette setbits(sc, AO_RTC_REG0, AO_RTC_REG0_SEN); 268 1.2.2.2 pgoyette return 0; 269 1.2.2.2 pgoyette } 270 1.2.2.2 pgoyette return -1; 271 1.2.2.2 pgoyette } 272 1.2.2.2 pgoyette 273 1.2.2.2 pgoyette static void 274 1.2.2.2 pgoyette meson_rtc_static_register_write(struct meson_rtc_softc *sc, uint32_t data) 275 1.2.2.2 pgoyette { 276 1.2.2.2 pgoyette uint32_t u; 277 1.2.2.2 pgoyette 278 1.2.2.2 pgoyette /* Program MSB 15-8 */ 279 1.2.2.2 pgoyette u = RTC_READ(sc, AO_RTC_REG4); 280 1.2.2.2 pgoyette u &= AO_RTC_REG4_STATIC_REG_MSB; 281 1.2.2.2 pgoyette u |= __SHIFTIN(data, AO_RTC_REG4_STATIC_REG_MSB); 282 1.2.2.2 pgoyette RTC_WRITE(sc, AO_RTC_REG4, u); 283 1.2.2.2 pgoyette 284 1.2.2.2 pgoyette /* Program LSB 7-0, and start serializing */ 285 1.2.2.2 pgoyette u = RTC_READ(sc, AO_RTC_REG0); 286 1.2.2.2 pgoyette u &= ~AO_RTC_REG0_STATIC_REG_LSB; 287 1.2.2.2 pgoyette u |= __SHIFTIN(data, AO_RTC_REG0_STATIC_REG_LSB); 288 1.2.2.2 pgoyette u |= AO_RTC_REG0_SERIAL_START; 289 1.2.2.2 pgoyette RTC_WRITE(sc, AO_RTC_REG0, u); 290 1.2.2.2 pgoyette 291 1.2.2.2 pgoyette /* Poll auto_serializer_busy bit until it's low (IDLE) */ 292 1.2.2.2 pgoyette while ((RTC_READ(sc, AO_RTC_REG0) & AO_RTC_REG0_SERIAL_BUSY) != 0) 293 1.2.2.2 pgoyette continue; 294 1.2.2.2 pgoyette } 295 1.2.2.2 pgoyette 296 1.2.2.2 pgoyette static void 297 1.2.2.2 pgoyette meson_rtc_reset(struct meson_rtc_softc *sc) 298 1.2.2.2 pgoyette { 299 1.2.2.2 pgoyette 300 1.2.2.2 pgoyette meson_rtc_static_register_write(sc, RTC_STATIC_VALUE_INIT); 301 1.2.2.2 pgoyette } 302 1.2.2.2 pgoyette 303 1.2.2.2 pgoyette static int 304 1.2.2.2 pgoyette meson_rtc_serial_init(struct meson_rtc_softc *sc) 305 1.2.2.2 pgoyette { 306 1.2.2.2 pgoyette size_t init_cnt, retry_cnt; 307 1.2.2.2 pgoyette 308 1.2.2.2 pgoyette init_cnt = 0; 309 1.2.2.2 pgoyette retry_cnt = 0; 310 1.2.2.2 pgoyette while (meson_rtc_comm_init(sc) == -1) { 311 1.2.2.2 pgoyette if (init_cnt++ == RESET_RETRY_TIMES) { 312 1.2.2.2 pgoyette init_cnt = 0; 313 1.2.2.2 pgoyette if (retry_cnt++ == RESET_RETRY_TIMES) { 314 1.2.2.2 pgoyette aprint_error_dev(sc->sc_dev, 315 1.2.2.2 pgoyette "cannot init rtc\n"); 316 1.2.2.2 pgoyette return -1; 317 1.2.2.2 pgoyette } 318 1.2.2.2 pgoyette meson_rtc_reset(sc); 319 1.2.2.2 pgoyette } 320 1.2.2.2 pgoyette delay(RTC_RESET_DELAY); 321 1.2.2.2 pgoyette } 322 1.2.2.2 pgoyette return 0; 323 1.2.2.2 pgoyette } 324 1.2.2.2 pgoyette 325 1.2.2.2 pgoyette static int 326 1.2.2.2 pgoyette meson_rtc_serial_read(struct meson_rtc_softc *sc, uint32_t addr, 327 1.2.2.2 pgoyette uint32_t *sec) 328 1.2.2.2 pgoyette { 329 1.2.2.2 pgoyette 330 1.2.2.2 pgoyette if (meson_rtc_serial_init(sc) == -1) 331 1.2.2.2 pgoyette return EIO; 332 1.2.2.2 pgoyette 333 1.2.2.2 pgoyette meson_rtc_send_data(sc, SERIAL_TYPE_ADDR, addr); 334 1.2.2.2 pgoyette meson_rtc_set_mode(sc, SERIAL_MODE_READ); 335 1.2.2.2 pgoyette *sec = meson_rtc_get_data(sc); 336 1.2.2.2 pgoyette return 0; 337 1.2.2.2 pgoyette } 338 1.2.2.2 pgoyette 339 1.2.2.2 pgoyette static int 340 1.2.2.2 pgoyette meson_rtc_serial_write(struct meson_rtc_softc *sc, uint32_t addr, 341 1.2.2.2 pgoyette uint32_t data) 342 1.2.2.2 pgoyette { 343 1.2.2.2 pgoyette 344 1.2.2.2 pgoyette if (meson_rtc_serial_init(sc) == -1) 345 1.2.2.2 pgoyette return EIO; 346 1.2.2.2 pgoyette 347 1.2.2.2 pgoyette meson_rtc_send_data(sc, SERIAL_TYPE_DATA, data); 348 1.2.2.2 pgoyette meson_rtc_send_data(sc, SERIAL_TYPE_ADDR, addr); 349 1.2.2.2 pgoyette meson_rtc_set_mode(sc, SERIAL_MODE_WRITE); 350 1.2.2.2 pgoyette return 0; 351 1.2.2.2 pgoyette } 352 1.2.2.2 pgoyette 353 1.2.2.2 pgoyette static int 354 1.2.2.2 pgoyette meson_rtc_todr_gettime(todr_chip_handle_t ch, struct timeval *tv) 355 1.2.2.2 pgoyette { 356 1.2.2.2 pgoyette struct meson_rtc_softc * const sc = ch->cookie; 357 1.2.2.2 pgoyette uint32_t sec; 358 1.2.2.2 pgoyette int rv; 359 1.2.2.2 pgoyette 360 1.2.2.2 pgoyette if (atomic_swap_uint(&sc->sc_busy, 1)) 361 1.2.2.2 pgoyette return EBUSY; /* XXX: EAGAIN? */ 362 1.2.2.2 pgoyette 363 1.2.2.2 pgoyette rv = meson_rtc_serial_read(sc, RTC_COUNTER_ADDR, &sec); 364 1.2.2.2 pgoyette sc->sc_busy = 0; 365 1.2.2.2 pgoyette 366 1.2.2.2 pgoyette if (rv == 0) { 367 1.2.2.2 pgoyette tv->tv_sec = sec; 368 1.2.2.2 pgoyette tv->tv_usec = 0; 369 1.2.2.2 pgoyette } 370 1.2.2.2 pgoyette return rv; 371 1.2.2.2 pgoyette } 372 1.2.2.2 pgoyette 373 1.2.2.2 pgoyette static int 374 1.2.2.2 pgoyette meson_rtc_todr_settime(todr_chip_handle_t ch, struct timeval *tv) 375 1.2.2.2 pgoyette { 376 1.2.2.2 pgoyette struct meson_rtc_softc * const sc = ch->cookie; 377 1.2.2.2 pgoyette int rv; 378 1.2.2.2 pgoyette 379 1.2.2.2 pgoyette if (atomic_swap_uint(&sc->sc_busy, 1)) 380 1.2.2.2 pgoyette return EBUSY; /* XXX: EAGAIN? */ 381 1.2.2.2 pgoyette 382 1.2.2.2 pgoyette rv = meson_rtc_serial_write(sc, RTC_COUNTER_ADDR, tv->tv_sec); 383 1.2.2.2 pgoyette sc->sc_busy = 0; 384 1.2.2.2 pgoyette 385 1.2.2.2 pgoyette return rv; 386 1.2.2.2 pgoyette } 387
Indexes created Thu Oct 02 01:09:59 GMT 2025