On 12/01/2018 20:36, Justin Hibbits wrote:
Author: jhibbits
Date: Sat Jan 13 01:36:37 2018
New Revision: 327906
URL: https://svnweb.freebsd.org/changeset/base/327906
...

Added: head/sys/powerpc/mpc85xx/mpc85xx_cache.c
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ head/sys/powerpc/mpc85xx/mpc85xx_cache.c    Sat Jan 13 01:36:37 2018        
(r327906)
@@ -0,0 +1,129 @@
+/*-
+ * Copyright (c) 2018 Justin Hibbits
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+

Can we please add SPDX ID tags, specially on new code?
I had them added to the guidelines:

https://www.freebsd.org/doc/en_US.ISO8859-1/articles/committers-guide/pref-license.html

It is just not fun for me anymore to go hunting for untagged files and they keep appearing ;).

Pedro.






+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/resource.h>
+#include <sys/rman.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <machine/stdarg.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+/*
+ * From the P1022 manual, sequence for writing to L2CTL is:
+ * - mbar
+ * - isync
+ * - write
+ * - read
+ * - mbar
+ */
+#define        L2_CTL          0x0
+#define          L2CTL_L2E       0x80000000
+#define          L2CTL_L2I       0x40000000
+struct mpc85xx_cache_softc {
+       struct resource *sc_mem;
+};
+
+static int
+mpc85xx_cache_probe(device_t dev)
+{
+
+       if (!ofw_bus_is_compatible(dev, "cache"))
+               return (ENXIO);
+
+       device_set_desc(dev, "MPC85xx L2 cache");
+       return (0);
+}
+
+static int
+mpc85xx_cache_attach(device_t dev)
+{
+       struct mpc85xx_cache_softc *sc = device_get_softc(dev);
+       int rid;
+       int cache_line_size, cache_size;
+
+       /* Map registers. */
+       rid = 0;
+       sc->sc_mem = bus_alloc_resource_any(dev,
+                    SYS_RES_MEMORY, &rid, RF_ACTIVE);
+       if (sc->sc_mem == NULL)
+               return (ENOMEM);
+
+       /* Enable cache and flash invalidate. */
+       __asm __volatile ("mbar; isync" ::: "memory");
+       bus_write_4(sc->sc_mem, L2_CTL, L2CTL_L2E | L2CTL_L2I);
+       bus_read_4(sc->sc_mem, L2_CTL);
+       __asm __volatile ("mbar" ::: "memory");
+
+       cache_line_size = 0;
+       cache_size = 0;
+       OF_getencprop(ofw_bus_get_node(dev), "cache-size", &cache_size,
+           sizeof(cache_size));
+       OF_getencprop(ofw_bus_get_node(dev), "cache-line-size",
+           &cache_line_size, sizeof(cache_line_size));
+
+       if (cache_line_size != 0 && cache_size != 0)
+               device_printf(dev,
+                   "L2 cache size: %dKB, cache line size: %d bytes\n",
+                   cache_size / 1024, cache_line_size);
+
+       return (0);
+}
+
+static device_method_t mpc85xx_cache_methods[] = {
+       /* device methods */
+       DEVMETHOD(device_probe,         mpc85xx_cache_probe),
+       DEVMETHOD(device_attach,        mpc85xx_cache_attach),
+
+       DEVMETHOD_END
+};
+
+static driver_t mpc85xx_cache_driver = {
+       "cache",
+       mpc85xx_cache_methods,
+       sizeof(struct mpc85xx_cache_softc),
+};
+static devclass_t mpc85xx_cache_devclass;
+
+EARLY_DRIVER_MODULE(mpc85xx_cache, simplebus, mpc85xx_cache_driver,
+    mpc85xx_cache_devclass, NULL, NULL,
+    BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);


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