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sys/arm/mv/clk/a37x0_xtal.c
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/*- | |||||
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD | |||||
* | |||||
* Copyright (c) 2021 Semihalf. | |||||
* | |||||
* 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. | |||||
*/ | |||||
#include <sys/cdefs.h> | |||||
__FBSDID("$FreeBSD$"); | |||||
#include <sys/param.h> | |||||
#include <sys/bus.h> | |||||
#include <sys/kernel.h> | |||||
#include <sys/module.h> | |||||
#include <sys/mutex.h> | |||||
#include <sys/rman.h> | |||||
#include <machine/bus.h> | |||||
#include <dev/fdt/simplebus.h> | |||||
#include <dev/extres/clk/clk.h> | |||||
#include <dev/extres/clk/clk_fixed.h> | |||||
#include <dev/extres/syscon/syscon.h> | |||||
#include <dev/ofw/ofw_bus.h> | |||||
#include <dev/ofw/ofw_bus_subr.h> | |||||
#include "syscon_if.h" | |||||
#define BIT(x) (1 << (x)) | |||||
#define NB_GPIO1_PIN_LT_L 0x8 | |||||
#define NB_GPIO1_MPP1_9 BIT(9) | |||||
struct a37x0_xtal_softc { | |||||
device_t dev; | |||||
struct clkdom *clkdom; | |||||
}; | |||||
static devclass_t a37x0_xtal_devclass; | |||||
static int a37x0_xtal_attach(device_t dev); | |||||
static int a37x0_xtal_detach(device_t dev); | |||||
static int a37x0_xtal_probe(device_t dev); | |||||
static device_method_t a37x0_xtal_methods [] = { | |||||
DEVMETHOD(device_probe, a37x0_xtal_probe), | |||||
DEVMETHOD(device_attach, a37x0_xtal_attach), | |||||
DEVMETHOD(device_detach, a37x0_xtal_detach), | |||||
DEVMETHOD_END | |||||
}; | |||||
static driver_t a37x0_xtal_driver = { | |||||
"a37x0-xtal", | |||||
a37x0_xtal_methods, | |||||
sizeof(struct a37x0_xtal_softc) | |||||
}; | |||||
EARLY_DRIVER_MODULE(a37x0_xtal, simplebus, a37x0_xtal_driver, | |||||
a37x0_xtal_devclass, 0, 0, BUS_PASS_TIMER + BUS_PASS_ORDER_EARLY); | |||||
static int | |||||
a37x0_xtal_attach(device_t dev) | |||||
{ | |||||
struct a37x0_xtal_softc *sc; | |||||
struct clk_fixed_def def; | |||||
struct syscon *syscon; | |||||
phandle_t node; | |||||
uint32_t reg; | |||||
int error; | |||||
node = ofw_bus_get_node(dev); | |||||
sc = device_get_softc(dev); | |||||
def.clkdef.name = "armada-3700-xtal"; | |||||
def.clkdef.parent_names = NULL; | |||||
def.clkdef.parent_cnt = 0; | |||||
def.clkdef.id = 1; | |||||
def.mult = 0; | |||||
def.div = 0; | |||||
if (SYSCON_GET_HANDLE(dev, &syscon) != 0 || syscon == NULL){ | |||||
device_printf(dev, "Cannot get syscon driver handle\n"); | |||||
return (ENXIO); | |||||
} | |||||
reg = SYSCON_READ_4(syscon, NB_GPIO1_PIN_LT_L); | |||||
if (reg & NB_GPIO1_MPP1_9) | |||||
def.freq = 40000000; | |||||
else | |||||
def.freq = 25000000; | |||||
sc->clkdom = clkdom_create(dev); | |||||
error = clknode_fixed_register(sc->clkdom, &def); | |||||
if (error){ | |||||
device_printf(dev, "Cannot register clock node\n"); | |||||
return (ENXIO); | |||||
} | |||||
error = clkdom_finit(sc->clkdom); | |||||
if (error){ | |||||
device_printf(dev, "Cannot finalize clock domain initialization\n"); | |||||
return (ENXIO); | |||||
} | |||||
if (bootverbose) | |||||
clkdom_dump(sc->clkdom); | |||||
return (0); | |||||
} | |||||
static int | |||||
a37x0_xtal_probe(device_t dev) | |||||
{ | |||||
if (!ofw_bus_status_okay(dev)) | |||||
return (ENXIO); | |||||
if (!ofw_bus_is_compatible(dev, "marvell,armada-3700-xtal-clock")) | |||||
return (ENXIO); | |||||
device_set_desc(dev, "Marvell Armada 3700 Oscillator"); | |||||
return (BUS_PROBE_DEFAULT); | |||||
} | |||||
static int | |||||
a37x0_xtal_detach(device_t dev) | |||||
{ | |||||
return (EBUSY); | |||||
} |