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a20_cpu_cfg.c
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a20_cpu_cfg.h
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a20_padconf.c
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files.a20
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Editing: a20_cpu_cfg.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* CPU configuration module for Allwinner A20 */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/systm.h> #include <sys/bus.h> #include <sys/kernel.h> #include <sys/module.h> #include <sys/malloc.h> #include <sys/rman.h> #include <sys/timeet.h> #include <sys/timetc.h> #include <sys/watchdog.h> #include <machine/bus.h> #include <machine/cpu.h> #include <machine/intr.h> #include <dev/ofw/openfirm.h> #include <dev/ofw/ofw_bus.h> #include <dev/ofw/ofw_bus_subr.h> #include <machine/bus.h> #include "a20_cpu_cfg.h" struct a20_cpu_cfg_softc { struct resource *res; bus_space_tag_t bst; bus_space_handle_t bsh; }; static struct a20_cpu_cfg_softc *a20_cpu_cfg_sc = NULL; #define cpu_cfg_read_4(sc, reg) \ bus_space_read_4((sc)->bst, (sc)->bsh, (reg)) #define cpu_cfg_write_4(sc, reg, val) \ bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val)) static int a20_cpu_cfg_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (ofw_bus_is_compatible(dev, "allwinner,sun7i-cpu-cfg")) { device_set_desc(dev, "A20 CPU Configuration Module"); return(BUS_PROBE_DEFAULT); } return (ENXIO); } static int a20_cpu_cfg_attach(device_t dev) { struct a20_cpu_cfg_softc *sc = device_get_softc(dev); int rid = 0; if (a20_cpu_cfg_sc) return (ENXIO); sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); if (!sc->res) { device_printf(dev, "could not allocate resource\n"); return (ENXIO); } sc->bst = rman_get_bustag(sc->res); sc->bsh = rman_get_bushandle(sc->res); a20_cpu_cfg_sc = sc; return (0); } static device_method_t a20_cpu_cfg_methods[] = { DEVMETHOD(device_probe, a20_cpu_cfg_probe), DEVMETHOD(device_attach, a20_cpu_cfg_attach), { 0, 0 } }; static driver_t a20_cpu_cfg_driver = { "a20_cpu_cfg", a20_cpu_cfg_methods, sizeof(struct a20_cpu_cfg_softc), }; static devclass_t a20_cpu_cfg_devclass; EARLY_DRIVER_MODULE(a20_cpu_cfg, simplebus, a20_cpu_cfg_driver, a20_cpu_cfg_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_FIRST); uint64_t a20_read_counter64(void) { uint32_t lo, hi; /* Latch counter, wait for it to be ready to read. */ cpu_cfg_write_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG, CNT64_RL_EN); while (cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG) & CNT64_RL_EN) continue; hi = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_HIGH_REG); lo = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_LOW_REG); return (((uint64_t)hi << 32) | lo); }
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