Author: kevans Date: Mon Dec 11 18:04:04 2017 New Revision: 326773 URL: https://svnweb.freebsd.org/changeset/base/326773
Log: Add generic 'syscon' driver Upstream dts for allwinner will require a syscon driver, since the emac node coming in 4.15 will be using xref to /soc/syscon for configuring the emac clock. Add a generic syscon driver to attach to /soc/syscon for use by if_awg, providing basic read/write functionality to consumers. syscon driver will also be used by arm64 at least for A64+H5 emac/if_awg. Written by: mmel Reviewed by: manu Differential Revision: https://reviews.freebsd.org/D13295 Added: head/sys/dev/syscon/ head/sys/dev/syscon/syscon.c (contents, props changed) head/sys/dev/syscon/syscon_if.m (contents, props changed) Modified: head/sys/conf/files Modified: head/sys/conf/files ============================================================================== --- head/sys/conf/files Mon Dec 11 16:18:05 2017 (r326772) +++ head/sys/conf/files Mon Dec 11 18:04:04 2017 (r326773) @@ -3109,6 +3109,8 @@ dev/stg/tmc18c30_subr.c optional stg dev/stge/if_stge.c optional stge dev/sym/sym_hipd.c optional sym \ dependency "$S/dev/sym/sym_{conf,defs}.h" +dev/syscon/syscon.c optional fdt syscon +dev/syscon/syscon_if.m optional fdt syscon dev/syscons/blank/blank_saver.c optional blank_saver dev/syscons/daemon/daemon_saver.c optional daemon_saver dev/syscons/dragon/dragon_saver.c optional dragon_saver Added: head/sys/dev/syscon/syscon.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/dev/syscon/syscon.c Mon Dec 11 18:04:04 2017 (r326773) @@ -0,0 +1,185 @@ +/*- + * Copyright (c) 2015 Michal Meloun + * 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. + */ + +/* + * This is a generic syscon driver, whose purpose is to provide access to + * various unrelated bits packed in a single register space. It is usually used + * as a fallback to more specific driver, but works well enough for simple + * access. + */ + +#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/rman.h> + +#include <machine/bus.h> + +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include "syscon_if.h" + +#define SYSCON_LOCK(_sc) mtx_lock(&(_sc)->mtx) +#define SYSCON_UNLOCK(_sc) mtx_unlock(&(_sc)->mtx) +#define SYSCON_LOCK_INIT(_sc) mtx_init(&(_sc)->mtx, \ + device_get_nameunit((_sc)->dev), "syscon", MTX_DEF) +#define SYSCON_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->mtx); +#define SYSCON_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_OWNED); +#define SYSCON_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_NOTOWNED); + +struct syscon_softc { + device_t dev; + struct resource *mem_res; + struct mtx mtx; +}; + +static struct ofw_compat_data compat_data[] = { + {"syscon", 1}, + {NULL, 0} +}; + +static uint32_t +syscon_read_4(device_t dev, device_t consumer, bus_size_t offset) +{ + struct syscon_softc *sc; + uint32_t val; + + sc = device_get_softc(dev); + + SYSCON_LOCK(sc); + val = bus_read_4(sc->mem_res, offset); + SYSCON_UNLOCK(sc); + return (val); +} + +static void +syscon_write_4(device_t dev, device_t consumer, bus_size_t offset, uint32_t val) +{ + struct syscon_softc *sc; + + sc = device_get_softc(dev); + + SYSCON_LOCK(sc); + bus_write_4(sc->mem_res, offset, val); + SYSCON_UNLOCK(sc); +} + +static void +syscon_modify_4(device_t dev, device_t consumer, bus_size_t offset, + uint32_t clear_bits, uint32_t set_bits) +{ + struct syscon_softc *sc; + uint32_t val; + + sc = device_get_softc(dev); + + SYSCON_LOCK(sc); + val = bus_read_4(sc->mem_res, offset); + val &= ~clear_bits; + val |= ~set_bits; + bus_write_4(sc->mem_res, offset, val); + SYSCON_UNLOCK(sc); +} + +static int +syscon_probe(device_t dev) +{ + + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) + return (ENXIO); + + device_set_desc(dev, "syscon"); + return (BUS_PROBE_GENERIC); +} + +static int +syscon_attach(device_t dev) +{ + struct syscon_softc *sc; + int rid; + phandle_t node; + + sc = device_get_softc(dev); + sc->dev = dev; + node = ofw_bus_get_node(sc->dev); + + SYSCON_LOCK_INIT(sc); + + rid = 0; + sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, + RF_ACTIVE); + if (sc->mem_res == NULL) { + device_printf(dev, "Cannot allocate memory resource\n"); + return (ENXIO); + } + + OF_device_register_xref(OF_xref_from_node(node), dev); + + return (0); +} + +static int +syscon_detach(device_t dev) +{ + struct syscon_softc *sc; + + sc = device_get_softc(dev); + + OF_device_register_xref(OF_xref_from_device(dev), NULL); + + SYSCON_LOCK_DESTROY(sc); + if (sc->mem_res != NULL) + bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res); + return (0); +} + +static device_method_t syscon_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, syscon_probe), + DEVMETHOD(device_attach, syscon_attach), + DEVMETHOD(device_detach, syscon_detach), + + /* Syscon interface */ + DEVMETHOD(syscon_read_4, syscon_read_4), + DEVMETHOD(syscon_write_4, syscon_write_4), + DEVMETHOD(syscon_modify_4, syscon_modify_4), + + DEVMETHOD_END +}; + +DEFINE_CLASS_0(syscon, syscon_driver, syscon_methods, + sizeof(struct syscon_softc)); +static devclass_t syscon_devclass; +EARLY_DRIVER_MODULE(syscon, simplebus, syscon_driver, syscon_devclass, 0, 0, + BUS_PASS_BUS + BUS_PASS_ORDER_LATE); +MODULE_VERSION(syscon, 1); Added: head/sys/dev/syscon/syscon_if.m ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/dev/syscon/syscon_if.m Mon Dec 11 18:04:04 2017 (r326773) @@ -0,0 +1,55 @@ +#- +# Copyright (c) 2015 Michal Meloun +# 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. +# +# $FreeBSD$ +# + +#include <machine/bus.h> + +INTERFACE syscon; + +/** + * Accessor functions for syscon register space + */ +METHOD uint32_t read_4 { + device_t dev; + device_t consumer; + bus_size_t offset; +}; + +METHOD void write_4 { + device_t dev; + device_t consumer; + bus_size_t offset; + uint32_t val; +}; + +METHOD void modify_4 { + device_t dev; + device_t consumer; + bus_size_t offset; + uint32_t clear_bits; + uint32_t set_bits; +}; _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
