From 1c7231d291dc8bdb06b0a0035fcf508625ce2abb Mon Sep 17 00:00:00 2001
From: sam <sam@FreeBSD.org>
Date: Tue, 3 Feb 2009 19:09:16 +0000
Subject: honor any interface width (e.g. setup by the bus shim) and don't
 probe; this is needed for the moment to workaround bus shim issues

---
 sys/dev/cfi/cfi_bus_ixp4xx.c | 79 ++++++++++++++++++++++++++++++++++++++++++++
 sys/dev/cfi/cfi_core.c       | 15 ++++++---
 2 files changed, 89 insertions(+), 5 deletions(-)
 create mode 100644 sys/dev/cfi/cfi_bus_ixp4xx.c

diff --git a/sys/dev/cfi/cfi_bus_ixp4xx.c b/sys/dev/cfi/cfi_bus_ixp4xx.c
new file mode 100644
index 0000000..024b517
--- /dev/null
+++ b/sys/dev/cfi/cfi_bus_ixp4xx.c
@@ -0,0 +1,79 @@
+/*-
+ * Copyright (c) 2009 Sam Leffler, Errno Consulting
+ * 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>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>   
+#include <sys/module.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+
+#include <machine/bus.h>
+
+#include <dev/cfi/cfi_var.h>
+
+#include <arm/xscale/ixp425/ixp425reg.h>
+#include <arm/xscale/ixp425/ixp425var.h>
+
+static int
+cfi_ixp4xx_probe(device_t dev)
+{
+	struct cfi_softc *sc = device_get_softc(dev);
+	/*
+	 * NB: we assume the boot loader sets up EXP_TIMING_CS0_OFFSET
+	 * according to the flash on the board.  If it does not then it
+	 * can be done here.
+	 */
+	if (bootverbose) {
+		struct ixp425_softc *sa =
+		    device_get_softc(device_get_parent(dev));
+		device_printf(dev, "EXP_TIMING_CS0_OFFSET 0x%x\n",
+		    EXP_BUS_READ_4(sa, EXP_TIMING_CS0_OFFSET));
+	}
+	sc->sc_width = 2;		/* NB: don't probe interface width */
+	return cfi_probe(dev);
+}
+
+static device_method_t cfi_ixp4xx_methods[] = {
+	/* device interface */
+	DEVMETHOD(device_probe,		cfi_ixp4xx_probe),
+	DEVMETHOD(device_attach,	cfi_attach),
+	DEVMETHOD(device_detach,	cfi_detach),
+
+	{0, 0}
+};
+
+static driver_t cfi_ixp4xx_driver = {
+	cfi_driver_name,
+	cfi_ixp4xx_methods,
+	sizeof(struct cfi_softc),
+};
+DRIVER_MODULE (cfi, ixp, cfi_ixp4xx_driver, cfi_devclass, 0, 0);
diff --git a/sys/dev/cfi/cfi_core.c b/sys/dev/cfi/cfi_core.c
index 4df3190..c25e446f 100644
--- a/sys/dev/cfi/cfi_core.c
+++ b/sys/dev/cfi/cfi_core.c
@@ -150,11 +150,16 @@ cfi_probe(device_t dev)
 	sc->sc_tag = rman_get_bustag(sc->sc_res);
 	sc->sc_handle = rman_get_bushandle(sc->sc_res);
 
-	sc->sc_width = 1;
-	while (sc->sc_width <= 4) {
-		if (cfi_read_qry(sc, CFI_QRY_IDENT) == 'Q')
-			break;
-		sc->sc_width <<= 1;
+	if (sc->sc_width == 0) {
+		sc->sc_width = 1;
+		while (sc->sc_width <= 4) {
+			if (cfi_read_qry(sc, CFI_QRY_IDENT) == 'Q')
+				break;
+			sc->sc_width <<= 1;
+		}
+	} else if (cfi_read_qry(sc, CFI_QRY_IDENT) != 'Q') {
+		error = ENXIO;
+		goto out;
 	}
 	if (sc->sc_width > 4) {
 		error = ENXIO;
-- 
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