a20_cpu_cfg.c revision 281085
1208963Srdivacky/*- 2208963Srdivacky * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org> 3208963Srdivacky * All rights reserved. 4208963Srdivacky * 5208963Srdivacky * Redistribution and use in source and binary forms, with or without 6210299Sed * modification, are permitted provided that the following conditions 7210299Sed * are met: 8210299Sed * 1. Redistributions of source code must retain the above copyright 9210299Sed * notice, this list of conditions and the following disclaimer. 10210299Sed * 2. Redistributions in binary form must reproduce the above copyright 11210299Sed * notice, this list of conditions and the following disclaimer in the 12210299Sed * documentation and/or other materials provided with the distribution. 13210299Sed * 14210299Sed * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15210299Sed * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16210299Sed * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17210299Sed * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18210299Sed * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19210299Sed * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20210299Sed * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21210299Sed * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22210299Sed * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23210299Sed * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24210299Sed * SUCH DAMAGE. 25210299Sed */ 26210299Sed 27210299Sed/* CPU configuration module for Allwinner A20 */ 28210299Sed 29210299Sed#include <sys/cdefs.h> 30210299Sed__FBSDID("$FreeBSD: head/sys/arm/allwinner/a20/a20_cpu_cfg.c 281085 2015-04-04 21:34:26Z andrew $"); 31210299Sed 32210299Sed#include <sys/param.h> 33210299Sed#include <sys/systm.h> 34210299Sed#include <sys/bus.h> 35210299Sed#include <sys/kernel.h> 36210299Sed#include <sys/module.h> 37210299Sed#include <sys/malloc.h> 38210299Sed#include <sys/rman.h> 39210299Sed#include <sys/timeet.h> 40210299Sed#include <sys/timetc.h> 41210299Sed#include <sys/watchdog.h> 42210299Sed#include <machine/bus.h> 43210299Sed#include <machine/cpu.h> 44210299Sed#include <machine/intr.h> 45210299Sed 46210299Sed#include <dev/fdt/fdt_common.h> 47210299Sed#include <dev/ofw/openfirm.h> 48210299Sed#include <dev/ofw/ofw_bus.h> 49210299Sed#include <dev/ofw/ofw_bus_subr.h> 50210299Sed 51208963Srdivacky#include <machine/bus.h> 52208963Srdivacky 53#include "a20_cpu_cfg.h" 54 55struct a20_cpu_cfg_softc { 56 struct resource *res; 57 bus_space_tag_t bst; 58 bus_space_handle_t bsh; 59}; 60 61static 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 68static int 69a20_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 83static int 84a20_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 106static 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 112static driver_t a20_cpu_cfg_driver = { 113 "a20_cpu_cfg", 114 a20_cpu_cfg_methods, 115 sizeof(struct a20_cpu_cfg_softc), 116}; 117 118static devclass_t a20_cpu_cfg_devclass; 119 120DRIVER_MODULE(a20_cpu_cfg, simplebus, a20_cpu_cfg_driver, a20_cpu_cfg_devclass, 0, 0); 121 122uint64_t 123a20_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} 137 138