FMC: add core bus driver

This module offers registration services for both carriers
(i.e. devices) and mezzanines (i.e. drivers). The matching for devices
and drivers is performed according to the IPMI standard for FRU
devices (Field Replaceable Units).

The code includes support for parsing an SDB tree if present in the FPGA,
and dumping it for diagnostics. SDB is not mandatory.

Files in this commit correspond to commit ab23167f in the master branch
of the project hosted on ohwr.org.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Juan David Gonzalez Cobas <dcobas@cern.ch>
Acked-by: Emilio G. Cota <cota@braap.org>
Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 82 insertions, 0 deletions

diff --git a/drivers/fmc/fru-parse.c b/drivers/fmc/fru-parse.c
new file mode 100644
index 00000000000..cb46263c5da
--- /dev/null
+++ b/drivers/fmc/fru-parse.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2012 CERN (www.cern.ch)
+ * Author: Alessandro Rubini <rubini@gnudd.com>
+ *
+ * Released according to the GNU GPL, version 2 or any later version.
+ *
+ * This work is part of the White Rabbit project, a research effort led
+ * by CERN, the European Institute for Nuclear Research.
+ */
+#include <linux/ipmi-fru.h>
+
+/* Some internal helpers */
+static struct fru_type_length *
+__fru_get_board_tl(struct fru_common_header *header, int nr)
+{
+	struct fru_board_info_area *bia;
+	struct fru_type_length *tl;
+
+	bia = fru_get_board_area(header);
+	tl = bia->tl;
+	while (nr > 0 && !fru_is_eof(tl)) {
+		tl = fru_next_tl(tl);
+		nr--;
+	}
+	if (fru_is_eof(tl))
+		return NULL;
+	return tl;
+}
+
+static char *__fru_alloc_get_tl(struct fru_common_header *header, int nr)
+{
+	struct fru_type_length *tl;
+	char *res;
+	int len;
+
+	tl = __fru_get_board_tl(header, nr);
+	if (!tl)
+		return NULL;
+	len = fru_strlen(tl);
+	res = fru_alloc(fru_strlen(tl) + 1);
+	if (!res)
+		return NULL;
+	return fru_strcpy(res, tl);
+}
+
+/* Public checksum verifiers */
+int fru_header_cksum_ok(struct fru_common_header *header)
+{
+	uint8_t *ptr = (void *)header;
+	int i, sum;
+
+	for (i = sum = 0; i < sizeof(*header); i++)
+		sum += ptr[i];
+	return (sum & 0xff) == 0;
+}
+int fru_bia_cksum_ok(struct fru_board_info_area *bia)
+{
+	uint8_t *ptr = (void *)bia;
+	int i, sum;
+
+	for (i = sum = 0; i < 8 * bia->area_len; i++)
+		sum += ptr[i];
+	return (sum & 0xff) == 0;
+}
+
+/* Get various stuff, trivial */
+char *fru_get_board_manufacturer(struct fru_common_header *header)
+{
+	return __fru_alloc_get_tl(header, 0);
+}
+char *fru_get_product_name(struct fru_common_header *header)
+{
+	return __fru_alloc_get_tl(header, 1);
+}
+char *fru_get_serial_number(struct fru_common_header *header)
+{
+	return __fru_alloc_get_tl(header, 2);
+}
+char *fru_get_part_number(struct fru_common_header *header)
+{
+	return __fru_alloc_get_tl(header, 3);
+}