1 /*- 2 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 /* CPU configuration module for Allwinner A20 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/module.h> 37 #include <sys/malloc.h> 38 #include <sys/rman.h> 39 #include <sys/timeet.h> 40 #include <sys/timetc.h> 41 #include <sys/watchdog.h> 42 #include <machine/bus.h> 43 #include <machine/cpu.h> 44 #include <machine/intr.h> 45 46 #include <dev/fdt/fdt_common.h> 47 #include <dev/ofw/openfirm.h> 48 #include <dev/ofw/ofw_bus.h> 49 #include <dev/ofw/ofw_bus_subr.h> 50 51 #include <machine/bus.h> 52 53 #include "a20_cpu_cfg.h" 54 55 struct a20_cpu_cfg_softc { 56 struct resource *res; 57 bus_space_tag_t bst; 58 bus_space_handle_t bsh; 59 }; 60 61 static struct a20_cpu_cfg_softc *a20_cpu_cfg_sc = NULL; 62 63 #define cpu_cfg_read_4(sc, reg) \ 64 bus_space_read_4((sc)->bst, (sc)->bsh, (reg)) 65 #define cpu_cfg_write_4(sc, reg, val) \ 66 bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val)) 67 68 static int 69 a20_cpu_cfg_probe(device_t dev) 70 { 71 72 if (!ofw_bus_status_okay(dev)) 73 return (ENXIO); 74 75 if (ofw_bus_is_compatible(dev, "allwinner,sun7i-cpu-cfg")) { 76 device_set_desc(dev, "A20 CPU Configuration Module"); 77 return(BUS_PROBE_DEFAULT); 78 } 79 80 return (ENXIO); 81 } 82 83 static int 84 a20_cpu_cfg_attach(device_t dev) 85 { 86 struct a20_cpu_cfg_softc *sc = device_get_softc(dev); 87 int rid = 0; 88 89 if (a20_cpu_cfg_sc) 90 return (ENXIO); 91 92 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 93 if (!sc->res) { 94 device_printf(dev, "could not allocate resource\n"); 95 return (ENXIO); 96 } 97 98 sc->bst = rman_get_bustag(sc->res); 99 sc->bsh = rman_get_bushandle(sc->res); 100 101 a20_cpu_cfg_sc = sc; 102 103 return (0); 104 } 105 106 static device_method_t a20_cpu_cfg_methods[] = { 107 DEVMETHOD(device_probe, a20_cpu_cfg_probe), 108 DEVMETHOD(device_attach, a20_cpu_cfg_attach), 109 { 0, 0 } 110 }; 111 112 static driver_t a20_cpu_cfg_driver = { 113 "a20_cpu_cfg", 114 a20_cpu_cfg_methods, 115 sizeof(struct a20_cpu_cfg_softc), 116 }; 117 118 static devclass_t a20_cpu_cfg_devclass; 119 120 EARLY_DRIVER_MODULE(a20_cpu_cfg, simplebus, a20_cpu_cfg_driver, a20_cpu_cfg_devclass, 0, 0, 121 BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE); 122 123 uint64_t 124 a20_read_counter64(void) 125 { 126 uint32_t lo, hi; 127 128 /* Latch counter, wait for it to be ready to read. */ 129 cpu_cfg_write_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG, CNT64_RL_EN); 130 while (cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG) & CNT64_RL_EN) 131 continue; 132 133 hi = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_HIGH_REG); 134 lo = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_LOW_REG); 135 136 return (((uint64_t)hi << 32) | lo); 137 } 138 139