svn commit: r326773 - in head/sys: conf dev/syscon
Kyle Evans
kevans at FreeBSD.org
Mon Dec 11 18:04:05 UTC 2017
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;
+};
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