Module Name: src
Committed By: jmcneill
Date: Sun Apr 16 12:29:20 UTC 2017
Modified Files:
src/sys/dev/fdt: files.fdt
Added Files:
src/sys/dev/fdt: fixedclock.c
Log Message:
Add support for simple fixed-rate clock source bindings.
To generate a diff of this commit:
cvs rdiff -u -r1.8 -r1.9 src/sys/dev/fdt/files.fdt
cvs rdiff -u -r0 -r1.1 src/sys/dev/fdt/fixedclock.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/dev/fdt/files.fdt
diff -u src/sys/dev/fdt/files.fdt:1.8 src/sys/dev/fdt/files.fdt:1.9
--- src/sys/dev/fdt/files.fdt:1.8 Fri Apr 14 22:55:06 2017
+++ src/sys/dev/fdt/files.fdt Sun Apr 16 12:29:20 2017
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.8 2017/04/14 22:55:06 jmcneill Exp $
+# $NetBSD: files.fdt,v 1.9 2017/04/16 12:29:20 jmcneill Exp $
include "external/bsd/libfdt/conf/files.libfdt"
@@ -14,6 +14,10 @@ device fregulator
attach fregulator at fdt
file dev/fdt/fixedregulator.c fregulator
+device fclock: clk
+attach fclock at fdt
+file dev/fdt/fixedclock.c fclock
+
device gpiokeys
attach gpiokeys at fdt
file dev/fdt/gpiokeys.c gpiokeys
Added files:
Index: src/sys/dev/fdt/fixedclock.c
diff -u /dev/null src/sys/dev/fdt/fixedclock.c:1.1
--- /dev/null Sun Apr 16 12:29:20 2017
+++ src/sys/dev/fdt/fixedclock.c Sun Apr 16 12:29:20 2017
@@ -0,0 +1,145 @@
+/* $NetBSD: fixedclock.c,v 1.1 2017/04/16 12:29:20 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 Jared D. McNeill <[email protected]>
+ * 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 1.1 2017/04/16 12:29:20 jmcneill 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, 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;
+
+ sc->sc_dev = self;
+ sc->sc_phandle = phandle;
+ 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", faa->faa_name);
+
+ aprint_naive(": %u Hz fixed clock (%s)\n", sc->sc_clk.rate,
+ sc->sc_clk.base.name);
+
+ fdtbus_register_clock_controller(self, phandle, &fixedclock_fdt_funcs);
+}
+
+static struct clk *
+fixedclock_decode(device_t dev, 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;
+}
