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
This commit is contained in:
kevans
parent
b8955e64b9
commit
6625e5aad4
@ -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
|
||||
|
||||
185
sys/dev/syscon/syscon.c
Normal file
185
sys/dev/syscon/syscon.c
Normal file
@ -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);
|
||||
55
sys/dev/syscon/syscon_if.m
Normal file
55
sys/dev/syscon/syscon_if.m
Normal file
@ -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;
|
||||
};
|
||||
Loading…
x
Reference in New Issue
Block a user