1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* CPU configuration module for Allwinner A20 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/bus.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/malloc.h> 40 #include <sys/rman.h> 41 #include <sys/timeet.h> 42 #include <sys/timetc.h> 43 #include <sys/watchdog.h> 44 #include <machine/bus.h> 45 #include <machine/cpu.h> 46 #include <machine/intr.h> 47 48 #include <dev/ofw/openfirm.h> 49 #include <dev/ofw/ofw_bus.h> 50 #include <dev/ofw/ofw_bus_subr.h> 51 52 #include <machine/bus.h> 53 54 #include "a20_cpu_cfg.h" 55 56 struct a20_cpu_cfg_softc { 57 struct resource *res; 58 bus_space_tag_t bst; 59 bus_space_handle_t bsh; 60 }; 61 62 static struct a20_cpu_cfg_softc *a20_cpu_cfg_sc = NULL; 63 64 #define cpu_cfg_read_4(sc, reg) \ 65 bus_space_read_4((sc)->bst, (sc)->bsh, (reg)) 66 #define cpu_cfg_write_4(sc, reg, val) \ 67 bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val)) 68 69 static int 70 a20_cpu_cfg_probe(device_t dev) 71 { 72 73 if (!ofw_bus_status_okay(dev)) 74 return (ENXIO); 75 76 if (ofw_bus_is_compatible(dev, "allwinner,sun7i-cpu-cfg")) { 77 device_set_desc(dev, "A20 CPU Configuration Module"); 78 return(BUS_PROBE_DEFAULT); 79 } 80 81 return (ENXIO); 82 } 83 84 static int 85 a20_cpu_cfg_attach(device_t dev) 86 { 87 struct a20_cpu_cfg_softc *sc = device_get_softc(dev); 88 int rid = 0; 89 90 if (a20_cpu_cfg_sc) 91 return (ENXIO); 92 93 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 94 if (!sc->res) { 95 device_printf(dev, "could not allocate resource\n"); 96 return (ENXIO); 97 } 98 99 sc->bst = rman_get_bustag(sc->res); 100 sc->bsh = rman_get_bushandle(sc->res); 101 102 a20_cpu_cfg_sc = sc; 103 104 return (0); 105 } 106 107 static device_method_t a20_cpu_cfg_methods[] = { 108 DEVMETHOD(device_probe, a20_cpu_cfg_probe), 109 DEVMETHOD(device_attach, a20_cpu_cfg_attach), 110 { 0, 0 } 111 }; 112 113 static driver_t a20_cpu_cfg_driver = { 114 "a20_cpu_cfg", 115 a20_cpu_cfg_methods, 116 sizeof(struct a20_cpu_cfg_softc), 117 }; 118 119 EARLY_DRIVER_MODULE(a20_cpu_cfg, simplebus, a20_cpu_cfg_driver, 0, 0, 120 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST); 121 122 uint64_t 123 a20_read_counter64(void) 124 { 125 uint32_t lo, hi; 126 127 /* Latch counter, wait for it to be ready to read. */ 128 cpu_cfg_write_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG, CNT64_RL_EN); 129 while (cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG) & CNT64_RL_EN) 130 continue; 131 132 hi = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_HIGH_REG); 133 lo = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_LOW_REG); 134 135 return (((uint64_t)hi << 32) | lo); 136 } 137