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/* $NetBSD: fixedclock.c,v 1.5 2018/09/09 07:21:18 aymeric Exp $ */
/*-
* Copyright (c) 2017 Jared D. McNeill <jmcneill@invisible.ca>
* 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 ``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 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>
__KERNEL_RCSID(0, "$NetBSD: fixedclock.c,v 1.5 2018/09/09 07:21:18 aymeric Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kmem.h>
#include <sys/bus.h>
#include <dev/clk/clk_backend.h>
#include <dev/fdt/fdtvar.h>
static int fixedclock_match(device_t, cfdata_t, void *);
static void fixedclock_attach(device_t, device_t, void *);
static struct clk *fixedclock_decode(device_t, int, const void *, size_t);
static const struct fdtbus_clock_controller_func fixedclock_fdt_funcs = {
.decode = fixedclock_decode
};
static struct clk *fixedclock_get(void *, const char *);
static void fixedclock_put(void *, struct clk *);
static u_int fixedclock_get_rate(void *, struct clk *);
static const struct clk_funcs fixedclock_clk_funcs = {
.get = fixedclock_get,
.put = fixedclock_put,
.get_rate = fixedclock_get_rate,
};
struct fixedclock_clk {
struct clk base;
u_int rate;
};
struct fixedclock_softc {
device_t sc_dev;
int sc_phandle;
struct clk_domain sc_clkdom;
struct fixedclock_clk sc_clk;
};
CFATTACH_DECL_NEW(fclock, sizeof(struct fixedclock_softc),
fixedclock_match, fixedclock_attach, NULL, NULL);
static int
fixedclock_match(device_t parent, cfdata_t cf, void *aux)
{
const char * const compatible[] = { "fixed-clock", NULL };
const struct fdt_attach_args *faa = aux;
return of_match_compatible(faa->faa_phandle, compatible);
}
static void
fixedclock_attach(device_t parent, device_t self, void *aux)
{
struct fixedclock_softc * const sc = device_private(self);
const struct fdt_attach_args *faa = aux;
const int phandle = faa->faa_phandle;
const char *clkname;
clkname = fdtbus_get_string(phandle, "clock-output-names");
if (!clkname)
clkname = faa->faa_name;
sc->sc_dev = self;
sc->sc_phandle = phandle;
sc->sc_clkdom.name = device_xname(self);
sc->sc_clkdom.funcs = &fixedclock_clk_funcs;
sc->sc_clkdom.priv = sc;
if (of_getprop_uint32(phandle, "clock-frequency",
&sc->sc_clk.rate) != 0) {
aprint_error(": couldn't determine frequency\n");
return;
}
sc->sc_clk.base.domain = &sc->sc_clkdom;
sc->sc_clk.base.name = kmem_asprintf("%s", clkname);
clk_attach(&sc->sc_clk.base);
aprint_naive("\n");
aprint_normal(": %u Hz fixed clock (%s)\n", sc->sc_clk.rate, clkname);
fdtbus_register_clock_controller(self, phandle, &fixedclock_fdt_funcs);
}
static struct clk *
fixedclock_decode(device_t dev, int cc_phandle, const void *data, size_t len)
{
struct fixedclock_softc * const sc = device_private(dev);
/* #clock-cells for a fixed clock is always 0 */
if (len != 0)
return NULL;
return &sc->sc_clk.base;
}
static struct clk *
fixedclock_get(void *priv, const char *name)
{
struct fixedclock_softc * const sc = priv;
if (strcmp(name, sc->sc_clk.base.name) != 0)
return NULL;
return &sc->sc_clk.base;
}
static void
fixedclock_put(void *priv, struct clk *clk)
{
}
static u_int
fixedclock_get_rate(void *priv, struct clk *clk)
{
struct fixedclock_clk *fclk = (struct fixedclock_clk *)clk;
return fclk->rate;
}
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