freebsd-dev/sys/arm/amlogic/aml8726/aml8726_ccm.c
Oleksandr Tymoshenko 217d17bcd3 Clean up OF_getprop_alloc API
OF_getprop_alloc takes element size argument and returns number of
elements in the property. There are valid use cases for such behavior
but mostly API consumers pass 1 as element size to get string
properties. What API users would expect from OF_getprop_alloc is to be
a combination of malloc + OF_getprop with the same semantic of return
value. This patch modifies API signature to match these expectations.

For the valid use cases with element size != 1 and to reduce
modification scope new OF_getprop_alloc_multi function has been
introduced that behaves the same way OF_getprop_alloc behaved prior to
this patch.

Reviewed by:	ian, manu
Differential Revision:	https://reviews.freebsd.org/D14850
2018-04-08 22:59:34 +00:00

230 lines
5.5 KiB
C

/*-
* Copyright 2015 John Wehle <john@feith.com>
* 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.
*/
/*
* Amlogic aml8726 clock control module driver.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/amlogic/aml8726/aml8726_soc.h>
#include <arm/amlogic/aml8726/aml8726_ccm.h>
struct aml8726_ccm_softc {
device_t dev;
struct aml8726_ccm_function *soc;
struct resource *res[1];
struct mtx mtx;
};
static struct resource_spec aml8726_ccm_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ -1, 0 }
};
#define AML_CCM_LOCK(sc) mtx_lock(&(sc)->mtx)
#define AML_CCM_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
#define AML_CCM_LOCK_INIT(sc) \
mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev), \
"ccm", MTX_DEF)
#define AML_CCM_LOCK_DESTROY(sc) mtx_destroy(&(sc)->mtx);
#define CSR_WRITE_4(sc, reg, val) bus_write_4((sc)->res[0], reg, (val))
#define CSR_READ_4(sc, reg) bus_read_4((sc)->res[0], reg)
static int
aml8726_ccm_configure_gates(struct aml8726_ccm_softc *sc)
{
struct aml8726_ccm_function *f;
struct aml8726_ccm_gate *g;
char *function_name;
char *functions;
phandle_t node;
ssize_t len;
uint32_t value;
node = ofw_bus_get_node(sc->dev);
len = OF_getprop_alloc(node, "functions",
(void **)&functions);
if (len < 0) {
device_printf(sc->dev, "missing functions attribute in FDT\n");
return (ENXIO);
}
function_name = functions;
while (len) {
for (f = sc->soc; f->name != NULL; f++)
if (strncmp(f->name, function_name, len) == 0)
break;
if (f->name == NULL) {
/* display message prior to queuing up next string */
device_printf(sc->dev,
"unknown function attribute %.*s in FDT\n",
len, function_name);
}
/* queue up next string */
while (*function_name && len) {
function_name++;
len--;
}
if (len) {
function_name++;
len--;
}
if (f->name == NULL)
continue;
AML_CCM_LOCK(sc);
/*
* Enable the clock gates necessary for the function.
*
* In some cases a clock may be shared across functions
* (meaning don't disable a clock without ensuring that
* it's not required by someone else).
*/
for (g = f->gates; g->bits != 0x00000000; g++) {
value = CSR_READ_4(sc, g->addr);
value |= g->bits;
CSR_WRITE_4(sc, g->addr, value);
}
AML_CCM_UNLOCK(sc);
}
OF_prop_free(functions);
return (0);
}
static int
aml8726_ccm_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "amlogic,aml8726-ccm"))
return (ENXIO);
device_set_desc(dev, "Amlogic aml8726 ccm");
return (BUS_PROBE_DEFAULT);
}
static int
aml8726_ccm_attach(device_t dev)
{
struct aml8726_ccm_softc *sc = device_get_softc(dev);
sc->dev = dev;
switch (aml8726_soc_hw_rev) {
case AML_SOC_HW_REV_M3:
sc->soc = aml8726_m3_ccm;
break;
case AML_SOC_HW_REV_M6:
sc->soc = aml8726_m6_ccm;
break;
case AML_SOC_HW_REV_M8:
sc->soc = aml8726_m8_ccm;
break;
case AML_SOC_HW_REV_M8B:
sc->soc = aml8726_m8b_ccm;
break;
default:
device_printf(dev, "unsupported SoC\n");
return (ENXIO);
/* NOTREACHED */
}
if (bus_alloc_resources(dev, aml8726_ccm_spec, sc->res)) {
device_printf(dev, "can not allocate resources for device\n");
return (ENXIO);
}
AML_CCM_LOCK_INIT(sc);
return (aml8726_ccm_configure_gates(sc));
}
static int
aml8726_ccm_detach(device_t dev)
{
struct aml8726_ccm_softc *sc = device_get_softc(dev);
AML_CCM_LOCK_DESTROY(sc);
bus_release_resources(dev, aml8726_ccm_spec, sc->res);
return (0);
}
static device_method_t aml8726_ccm_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, aml8726_ccm_probe),
DEVMETHOD(device_attach, aml8726_ccm_attach),
DEVMETHOD(device_detach, aml8726_ccm_detach),
DEVMETHOD_END
};
static driver_t aml8726_ccm_driver = {
"ccm",
aml8726_ccm_methods,
sizeof(struct aml8726_ccm_softc),
};
static devclass_t aml8726_ccm_devclass;
EARLY_DRIVER_MODULE(ccm, simplebus, aml8726_ccm_driver,
aml8726_ccm_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_LATE);