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/* $NetBSD: fixedfactorclock.c,v 1.4 2021/01/27 03:10:21 thorpej Exp $ */
/*-
* Copyright (c) 2017 Jared 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: fixedfactorclock.c,v 1.4 2021/01/27 03:10:21 thorpej 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 fixedfactorclock_match(device_t, cfdata_t, void *);
static void fixedfactorclock_attach(device_t, device_t, void *);
static struct clk *fixedfactorclock_decode(device_t, int, const void *, size_t);
static const struct fdtbus_clock_controller_func fixedfactorclock_fdt_funcs = {
.decode = fixedfactorclock_decode
};
static struct clk *fixedfactorclock_get(void *, const char *);
static void fixedfactorclock_put(void *, struct clk *);
static u_int fixedfactorclock_get_rate(void *, struct clk *);
static const struct clk_funcs fixedfactorclock_clk_funcs = {
.get = fixedfactorclock_get,
.put = fixedfactorclock_put,
.get_rate = fixedfactorclock_get_rate,
};
struct fixedfactorclock_clk {
struct clk base;
u_int div;
u_int mult;
};
struct fixedfactorclock_softc {
device_t sc_dev;
int sc_phandle;
struct clk_domain sc_clkdom;
struct fixedfactorclock_clk sc_clk;
};
CFATTACH_DECL_NEW(ffclock, sizeof(struct fixedfactorclock_softc),
fixedfactorclock_match, fixedfactorclock_attach, NULL, NULL);
static const struct device_compatible_entry compat_data[] = {
{ .compat = "fixed-factor-clock" },
DEVICE_COMPAT_EOL
};
static int
fixedfactorclock_match(device_t parent, cfdata_t cf, void *aux)
{
const struct fdt_attach_args *faa = aux;
return of_compatible_match(faa->faa_phandle, compat_data);
}
static void
fixedfactorclock_attach(device_t parent, device_t self, void *aux)
{
struct fixedfactorclock_softc * const sc = device_private(self);
const struct fdt_attach_args *faa = aux;
const int phandle = faa->faa_phandle;
const char *name;
sc->sc_dev = self;
sc->sc_phandle = phandle;
sc->sc_clkdom.name = device_xname(self);
sc->sc_clkdom.funcs = &fixedfactorclock_clk_funcs;
sc->sc_clkdom.priv = sc;
of_getprop_uint32(phandle, "clock-div", &sc->sc_clk.div);
of_getprop_uint32(phandle, "clock-mult", &sc->sc_clk.mult);
if (sc->sc_clk.div == 0 || sc->sc_clk.mult == 0) {
aprint_error(": invalid properties\n");
return;
}
name = fdtbus_get_string(phandle, "clock-output-names");
if (name == NULL)
name = faa->faa_name;
sc->sc_clk.base.domain = &sc->sc_clkdom;
sc->sc_clk.base.name = name;
clk_attach(&sc->sc_clk.base);
aprint_naive("\n");
aprint_normal(": x%u /%u fixed-factor clock\n",
sc->sc_clk.mult, sc->sc_clk.div);
fdtbus_register_clock_controller(self, phandle,
&fixedfactorclock_fdt_funcs);
}
static struct clk *
fixedfactorclock_decode(device_t dev, int cc_phandle, const void *data,
size_t len)
{
struct fixedfactorclock_softc * const sc = device_private(dev);
/* #clock-cells for a fixed factor clock is always 0 */
if (len != 0)
return NULL;
return &sc->sc_clk.base;
}
static struct clk *
fixedfactorclock_get(void *priv, const char *name)
{
struct fixedfactorclock_softc * const sc = priv;
if (strcmp(name, sc->sc_clk.base.name) != 0)
return NULL;
return &sc->sc_clk.base;
}
static void
fixedfactorclock_put(void *priv, struct clk *clk)
{
}
static u_int
fixedfactorclock_get_rate(void *priv, struct clk *clk)
{
struct fixedfactorclock_softc * const sc = priv;
struct fixedfactorclock_clk *fclk = (struct fixedfactorclock_clk *)clk;
struct clk *clkp_parent;
clkp_parent = fdtbus_clock_get_index(sc->sc_phandle, 0);
if (clkp_parent == NULL)
return 0;
return (clk_get_rate(clkp_parent) * fclk->mult) / fclk->div;
}
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