1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 32 #include <sys/systm.h> 33 #include <sys/bus.h> 34 #include <sys/kernel.h> 35 #include <sys/module.h> 36 #include <sys/malloc.h> 37 #include <sys/rman.h> 38 #include <sys/timeet.h> 39 #include <sys/timetc.h> 40 #include <sys/watchdog.h> 41 #include <machine/bus.h> 42 #include <machine/cpu.h> 43 #include <machine/intr.h> 44 45 #include <dev/ofw/openfirm.h> 46 #include <dev/ofw/ofw_bus.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include <machine/bus.h> 50 51 #include "a20_cpu_cfg.h" 52 53 struct a20_cpu_cfg_softc { 54 struct resource *res; 55 bus_space_tag_t bst; 56 bus_space_handle_t bsh; 57 }; 58 59 static struct a20_cpu_cfg_softc *a20_cpu_cfg_sc = NULL; 60 61 #define cpu_cfg_read_4(sc, reg) \ 62 bus_space_read_4((sc)->bst, (sc)->bsh, (reg)) 63 #define cpu_cfg_write_4(sc, reg, val) \ 64 bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val)) 65 66 static int 67 a20_cpu_cfg_probe(device_t dev) 68 { 69 70 if (!ofw_bus_status_okay(dev)) 71 return (ENXIO); 72 73 if (ofw_bus_is_compatible(dev, "allwinner,sun7i-cpu-cfg")) { 74 device_set_desc(dev, "A20 CPU Configuration Module"); 75 return(BUS_PROBE_DEFAULT); 76 } 77 78 return (ENXIO); 79 } 80 81 static int 82 a20_cpu_cfg_attach(device_t dev) 83 { 84 struct a20_cpu_cfg_softc *sc = device_get_softc(dev); 85 int rid = 0; 86 87 if (a20_cpu_cfg_sc) 88 return (ENXIO); 89 90 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 91 if (!sc->res) { 92 device_printf(dev, "could not allocate resource\n"); 93 return (ENXIO); 94 } 95 96 sc->bst = rman_get_bustag(sc->res); 97 sc->bsh = rman_get_bushandle(sc->res); 98 99 a20_cpu_cfg_sc = sc; 100 101 return (0); 102 } 103 104 static device_method_t a20_cpu_cfg_methods[] = { 105 DEVMETHOD(device_probe, a20_cpu_cfg_probe), 106 DEVMETHOD(device_attach, a20_cpu_cfg_attach), 107 { 0, 0 } 108 }; 109 110 static driver_t a20_cpu_cfg_driver = { 111 "a20_cpu_cfg", 112 a20_cpu_cfg_methods, 113 sizeof(struct a20_cpu_cfg_softc), 114 }; 115 116 EARLY_DRIVER_MODULE(a20_cpu_cfg, simplebus, a20_cpu_cfg_driver, 0, 0, 117 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST); 118 119 uint64_t 120 a20_read_counter64(void) 121 { 122 uint32_t lo, hi; 123 124 /* Latch counter, wait for it to be ready to read. */ 125 cpu_cfg_write_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG, CNT64_RL_EN); 126 while (cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG) & CNT64_RL_EN) 127 continue; 128 129 hi = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_HIGH_REG); 130 lo = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_LOW_REG); 131 132 return (((uint64_t)hi << 32) | lo); 133 } 134