Add a new geom class which allows to divide NAND Flash chip

into partitions.

Partitions are created based on data in dts file which are
extracted and interpreted by slicer.

Obtained from: Semihalf
Supported by:  FreeBSD Foundation, Juniper Networks

2 files changed, 116 insertions, 0 deletions

diff --git a/sys/dev/fdt/fdt_common.h b/sys/dev/fdt/fdt_common.h
index 0bedb91..7947428 100644
--- a/sys/dev/fdt/fdt_common.h
+++ b/sys/dev/fdt/fdt_common.h
@@ -32,6 +32,7 @@
 #ifndef _FDT_COMMON_H_
 #define _FDT_COMMON_H_
 
+#include <sys/slicer.h>
 #include <contrib/libfdt/libfdt_env.h>
 #include <dev/ofw/ofw_bus.h>
 #include <machine/fdt.h>
diff --git a/sys/dev/fdt/fdt_slicer.c b/sys/dev/fdt/fdt_slicer.c
new file mode 100644
index 0000000..d32d159
--- /dev/null
+++ b/sys/dev/fdt/fdt_slicer.c
@@ -0,0 +1,115 @@
+/*-
+ * Copyright (c) 2012 Semihalf.
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/slicer.h>
+
+#include <dev/fdt/fdt_common.h>
+
+#define DEBUG
+#undef DEBUG
+
+#ifdef DEBUG
+#define debugf(fmt, args...) do { printf("%s(): ", __func__);	\
+    printf(fmt,##args); } while (0)
+#else
+#define debugf(fmt, args...)
+#endif
+
+int
+flash_fill_slices(device_t dev, struct flash_slice *slices, int *slices_num)
+{
+	char *slice_name;
+	phandle_t dt_node, dt_child;
+	u_long base, size;
+	int i;
+	ssize_t name_len;
+
+	/*
+	 * We assume the caller provides buffer for FLASH_SLICES_MAX_NUM
+	 * flash_slice structures.
+	 */
+	if (slices == NULL) {
+		*slices_num = 0;
+		return (ENOMEM);
+	}
+
+	dt_node = ofw_bus_get_node(dev);
+	for (dt_child = OF_child(dt_node), i = 0; dt_child != 0;
+	    dt_child = OF_peer(dt_child)) {
+
+		if (i == FLASH_SLICES_MAX_NUM) {
+			debugf("not enough buffer for slice i=%d\n", i);
+			break;
+		}
+
+		/*
+		 * Retrieve start and size of the slice.
+		 */
+		if (fdt_regsize(dt_child, &base, &size) != 0) {
+			debugf("error during processing reg property, i=%d\n",
+			    i);
+			continue;
+		}
+
+		if (size == 0) {
+			debugf("slice i=%d with no size\n", i);
+			continue;
+		}
+
+		/*
+		 * Retrieve label.
+		 */
+		name_len = OF_getprop_alloc(dt_child, "label", sizeof(char),
+		    (void **)&slice_name);
+		if (name_len <= 0) {
+			/* Use node name if no label defined */
+			name_len = OF_getprop_alloc(dt_child, "name", sizeof(char),
+			    (void **)&slice_name);
+			if (name_len <= 0) {
+				debugf("slice i=%d with no name\n", i);
+				slice_name = NULL;
+			}
+		}
+
+		/*
+		 * Fill slice entry data.
+		 */
+		slices[i].base = base;
+		slices[i].size = size;
+		slices[i].label = slice_name;
+		i++;
+	}
+
+	*slices_num = i;
+	return (0);
+}