tools: move pcmcia crc32hash tool from Documentation

Move pcmcia crc32hash tool from Documentation to tools/pcmcia and
remove it from Documentation Makefile. Update location information
for this tool. Create a new Makefile to build pcmcia. It can be built
from top level directory or from pcmcia directory:

Run make -C tools/pcmcia or cd tools/pcmcia; make

Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

3 files changed, 42 insertions, 0 deletions

diff --git a/tools/pcmcia/.gitignore b/tools/pcmcia/.gitignore
new file mode 100644
index 000000000000..53d081336757
--- /dev/null
+++ b/tools/pcmcia/.gitignore
@@ -0,0 +1 @@
+crc32hash
diff --git a/tools/pcmcia/Makefile b/tools/pcmcia/Makefile
new file mode 100644
index 000000000000..81a7498c5cd9
--- /dev/null
+++ b/tools/pcmcia/Makefile
@@ -0,0 +1,9 @@
+CC := $(CROSS_COMPILE)gcc
+CFLAGS := -I../../usr/include
+
+PROGS := crc32hash
+
+all: $(PROGS)
+
+clean:
+        rm -fr $(PROGS)
diff --git a/tools/pcmcia/crc32hash.c b/tools/pcmcia/crc32hash.c
new file mode 100644
index 000000000000..44f8beea7260
--- /dev/null
+++ b/tools/pcmcia/crc32hash.c
@@ -0,0 +1,32 @@
+/* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */
+/* Usage example:
+$ ./crc32hash "Dual Speed"
+*/
+
+#include <string.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+static unsigned int crc32(unsigned char const *p, unsigned int len)
+{
+        int i;
+        unsigned int crc = 0;
+        while (len--) {
+                crc ^= *p++;
+                for (i = 0; i < 8; i++)
+                        crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
+        }
+        return crc;
+}
+
+int main(int argc, char **argv) {
+        unsigned int result;
+        if (argc != 2) {
+                printf("no string passed as argument\n");
+                return -1;
+        }
+        result = crc32((unsigned char const *)argv[1], strlen(argv[1]));
+        printf("0x%x\n", result);
+        return 0;
+}