157 lines
4.4 KiB
C
157 lines
4.4 KiB
C
/* $NetBSD: fixedclock.c,v 1.6 2021/01/27 03:10:21 thorpej Exp $ */
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/*-
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* Copyright (c) 2017 Jared D. McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: fixedclock.c,v 1.6 2021/01/27 03:10:21 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/kmem.h>
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#include <sys/bus.h>
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#include <dev/clk/clk_backend.h>
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#include <dev/fdt/fdtvar.h>
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static int fixedclock_match(device_t, cfdata_t, void *);
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static void fixedclock_attach(device_t, device_t, void *);
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static struct clk *fixedclock_decode(device_t, int, const void *, size_t);
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static const struct fdtbus_clock_controller_func fixedclock_fdt_funcs = {
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.decode = fixedclock_decode
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};
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static struct clk *fixedclock_get(void *, const char *);
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static void fixedclock_put(void *, struct clk *);
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static u_int fixedclock_get_rate(void *, struct clk *);
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static const struct clk_funcs fixedclock_clk_funcs = {
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.get = fixedclock_get,
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.put = fixedclock_put,
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.get_rate = fixedclock_get_rate,
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};
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struct fixedclock_clk {
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struct clk base;
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u_int rate;
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};
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struct fixedclock_softc {
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device_t sc_dev;
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int sc_phandle;
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struct clk_domain sc_clkdom;
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struct fixedclock_clk sc_clk;
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};
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CFATTACH_DECL_NEW(fclock, sizeof(struct fixedclock_softc),
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fixedclock_match, fixedclock_attach, NULL, NULL);
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static const struct device_compatible_entry compat_data[] = {
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{ .compat = "fixed-clock" },
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DEVICE_COMPAT_EOL
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};
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static int
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fixedclock_match(device_t parent, cfdata_t cf, void *aux)
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{
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const struct fdt_attach_args *faa = aux;
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return of_compatible_match(faa->faa_phandle, compat_data);
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}
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static void
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fixedclock_attach(device_t parent, device_t self, void *aux)
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{
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struct fixedclock_softc * const sc = device_private(self);
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const struct fdt_attach_args *faa = aux;
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const int phandle = faa->faa_phandle;
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const char *clkname;
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clkname = fdtbus_get_string(phandle, "clock-output-names");
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if (!clkname)
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clkname = faa->faa_name;
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sc->sc_dev = self;
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sc->sc_phandle = phandle;
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sc->sc_clkdom.name = device_xname(self);
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sc->sc_clkdom.funcs = &fixedclock_clk_funcs;
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sc->sc_clkdom.priv = sc;
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if (of_getprop_uint32(phandle, "clock-frequency",
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&sc->sc_clk.rate) != 0) {
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aprint_error(": couldn't determine frequency\n");
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return;
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}
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sc->sc_clk.base.domain = &sc->sc_clkdom;
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sc->sc_clk.base.name = kmem_asprintf("%s", clkname);
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clk_attach(&sc->sc_clk.base);
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aprint_naive("\n");
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aprint_normal(": %u Hz fixed clock (%s)\n", sc->sc_clk.rate, clkname);
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fdtbus_register_clock_controller(self, phandle, &fixedclock_fdt_funcs);
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}
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static struct clk *
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fixedclock_decode(device_t dev, int cc_phandle, const void *data, size_t len)
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{
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struct fixedclock_softc * const sc = device_private(dev);
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/* #clock-cells for a fixed clock is always 0 */
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if (len != 0)
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return NULL;
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return &sc->sc_clk.base;
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}
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static struct clk *
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fixedclock_get(void *priv, const char *name)
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{
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struct fixedclock_softc * const sc = priv;
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if (strcmp(name, sc->sc_clk.base.name) != 0)
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return NULL;
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return &sc->sc_clk.base;
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}
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static void
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fixedclock_put(void *priv, struct clk *clk)
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{
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}
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static u_int
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fixedclock_get_rate(void *priv, struct clk *clk)
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{
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struct fixedclock_clk *fclk = (struct fixedclock_clk *)clk;
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return fclk->rate;
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}
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