Module Name: src
Committed By: jmcneill
Date: Sat Jul 8 12:37:09 UTC 2017
Modified Files:
src/sys/dev/fdt: files.fdt
Added Files:
src/sys/dev/fdt: fixedfactorclock.c
Log Message:
Add driver for fixed-factor clocks.
To generate a diff of this commit:
cvs rdiff -u -r1.18 -r1.19 src/sys/dev/fdt/files.fdt
cvs rdiff -u -r0 -r1.1 src/sys/dev/fdt/fixedfactorclock.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:1.18 src/sys/dev/fdt/files.fdt:1.19
--- src/sys/dev/fdt/files.fdt:1.18 Sat Jul 8 00:55:02 2017
+++ src/sys/dev/fdt/files.fdt Sat Jul 8 12:37:08 2017
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.18 2017/07/08 00:55:02 jmcneill Exp $
+# $NetBSD: files.fdt,v 1.19 2017/07/08 12:37:08 jmcneill Exp $
include "external/bsd/libfdt/conf/files.libfdt"
@@ -18,6 +18,10 @@ device fclock: clk
attach fclock at fdt
file dev/fdt/fixedclock.c fclock
+device ffclock: clk
+attach ffclock at fdt
+file dev/fdt/fixedfactorclock.c ffclock
+
device gpiokeys: sysmon_envsys, sysmon_power
attach gpiokeys at fdt
file dev/fdt/gpiokeys.c gpiokeys
Added files:
Index: src/sys/dev/fdt/fixedfactorclock.c
diff -u /dev/null src/sys/dev/fdt/fixedfactorclock.c:1.1
--- /dev/null Sat Jul 8 12:37:09 2017
+++ src/sys/dev/fdt/fixedfactorclock.c Sat Jul 8 12:37:08 2017
@@ -0,0 +1,164 @@
+/* $NetBSD: fixedfactorclock.c,v 1.1 2017/07/08 12:37:08 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 Jared 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: fixedfactorclock.c,v 1.1 2017/07/08 12:37:08 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 fixedfactorclock_match(device_t, cfdata_t, void *);
+static void fixedfactorclock_attach(device_t, device_t, void *);
+
+static struct clk *fixedfactorclock_decode(device_t, 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 int
+fixedfactorclock_match(device_t parent, cfdata_t cf, void *aux)
+{
+ const char * const compatible[] = { "fixed-factor-clock", NULL };
+ const struct fdt_attach_args *faa = aux;
+
+ return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+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.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;
+
+ 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, 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;
+}
