summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/qib/qib_eeprom.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_eeprom.c')
-rw-r--r--drivers/infiniband/hw/qib/qib_eeprom.c271
1 files changed, 271 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/qib/qib_eeprom.c b/drivers/infiniband/hw/qib/qib_eeprom.c
new file mode 100644
index 000000000..bf660c001
--- /dev/null
+++ b/drivers/infiniband/hw/qib/qib_eeprom.c
@@ -0,0 +1,271 @@
+/*
+ * Copyright (c) 2012 Intel Corporation. All rights reserved.
+ * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
+ * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - 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.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/vmalloc.h>
+
+#include "qib.h"
+
+/*
+ * Functions specific to the serial EEPROM on cards handled by ib_qib.
+ * The actual serail interface code is in qib_twsi.c. This file is a client
+ */
+
+/**
+ * qib_eeprom_read - receives bytes from the eeprom via I2C
+ * @dd: the qlogic_ib device
+ * @eeprom_offset: address to read from
+ * @buff: where to store result
+ * @len: number of bytes to receive
+ */
+int qib_eeprom_read(struct qib_devdata *dd, u8 eeprom_offset,
+ void *buff, int len)
+{
+ int ret;
+
+ ret = mutex_lock_interruptible(&dd->eep_lock);
+ if (!ret) {
+ ret = qib_twsi_reset(dd);
+ if (ret)
+ qib_dev_err(dd, "EEPROM Reset for read failed\n");
+ else
+ ret = qib_twsi_blk_rd(dd, dd->twsi_eeprom_dev,
+ eeprom_offset, buff, len);
+ mutex_unlock(&dd->eep_lock);
+ }
+
+ return ret;
+}
+
+/*
+ * Actually update the eeprom, first doing write enable if
+ * needed, then restoring write enable state.
+ * Must be called with eep_lock held
+ */
+static int eeprom_write_with_enable(struct qib_devdata *dd, u8 offset,
+ const void *buf, int len)
+{
+ int ret, pwen;
+
+ pwen = dd->f_eeprom_wen(dd, 1);
+ ret = qib_twsi_reset(dd);
+ if (ret)
+ qib_dev_err(dd, "EEPROM Reset for write failed\n");
+ else
+ ret = qib_twsi_blk_wr(dd, dd->twsi_eeprom_dev,
+ offset, buf, len);
+ dd->f_eeprom_wen(dd, pwen);
+ return ret;
+}
+
+/**
+ * qib_eeprom_write - writes data to the eeprom via I2C
+ * @dd: the qlogic_ib device
+ * @eeprom_offset: where to place data
+ * @buff: data to write
+ * @len: number of bytes to write
+ */
+int qib_eeprom_write(struct qib_devdata *dd, u8 eeprom_offset,
+ const void *buff, int len)
+{
+ int ret;
+
+ ret = mutex_lock_interruptible(&dd->eep_lock);
+ if (!ret) {
+ ret = eeprom_write_with_enable(dd, eeprom_offset, buff, len);
+ mutex_unlock(&dd->eep_lock);
+ }
+
+ return ret;
+}
+
+static u8 flash_csum(struct qib_flash *ifp, int adjust)
+{
+ u8 *ip = (u8 *) ifp;
+ u8 csum = 0, len;
+
+ /*
+ * Limit length checksummed to max length of actual data.
+ * Checksum of erased eeprom will still be bad, but we avoid
+ * reading past the end of the buffer we were passed.
+ */
+ len = ifp->if_length;
+ if (len > sizeof(struct qib_flash))
+ len = sizeof(struct qib_flash);
+ while (len--)
+ csum += *ip++;
+ csum -= ifp->if_csum;
+ csum = ~csum;
+ if (adjust)
+ ifp->if_csum = csum;
+
+ return csum;
+}
+
+/**
+ * qib_get_eeprom_info- get the GUID et al. from the TSWI EEPROM device
+ * @dd: the qlogic_ib device
+ *
+ * We have the capability to use the nguid field, and get
+ * the guid from the first chip's flash, to use for all of them.
+ */
+void qib_get_eeprom_info(struct qib_devdata *dd)
+{
+ void *buf;
+ struct qib_flash *ifp;
+ __be64 guid;
+ int len, eep_stat;
+ u8 csum, *bguid;
+ int t = dd->unit;
+ struct qib_devdata *dd0 = qib_lookup(0);
+
+ if (t && dd0->nguid > 1 && t <= dd0->nguid) {
+ u8 oguid;
+
+ dd->base_guid = dd0->base_guid;
+ bguid = (u8 *) &dd->base_guid;
+
+ oguid = bguid[7];
+ bguid[7] += t;
+ if (oguid > bguid[7]) {
+ if (bguid[6] == 0xff) {
+ if (bguid[5] == 0xff) {
+ qib_dev_err(dd,
+ "Can't set GUID from base, wraps to OUI!\n");
+ dd->base_guid = 0;
+ goto bail;
+ }
+ bguid[5]++;
+ }
+ bguid[6]++;
+ }
+ dd->nguid = 1;
+ goto bail;
+ }
+
+ /*
+ * Read full flash, not just currently used part, since it may have
+ * been written with a newer definition.
+ * */
+ len = sizeof(struct qib_flash);
+ buf = vmalloc(len);
+ if (!buf)
+ goto bail;
+
+ /*
+ * Use "public" eeprom read function, which does locking and
+ * figures out device. This will migrate to chip-specific.
+ */
+ eep_stat = qib_eeprom_read(dd, 0, buf, len);
+
+ if (eep_stat) {
+ qib_dev_err(dd, "Failed reading GUID from eeprom\n");
+ goto done;
+ }
+ ifp = (struct qib_flash *)buf;
+
+ csum = flash_csum(ifp, 0);
+ if (csum != ifp->if_csum) {
+ qib_devinfo(dd->pcidev,
+ "Bad I2C flash checksum: 0x%x, not 0x%x\n",
+ csum, ifp->if_csum);
+ goto done;
+ }
+ if (*(__be64 *) ifp->if_guid == cpu_to_be64(0) ||
+ *(__be64 *) ifp->if_guid == ~cpu_to_be64(0)) {
+ qib_dev_err(dd,
+ "Invalid GUID %llx from flash; ignoring\n",
+ *(unsigned long long *) ifp->if_guid);
+ /* don't allow GUID if all 0 or all 1's */
+ goto done;
+ }
+
+ /* complain, but allow it */
+ if (*(u64 *) ifp->if_guid == 0x100007511000000ULL)
+ qib_devinfo(dd->pcidev,
+ "Warning, GUID %llx is default, probably not correct!\n",
+ *(unsigned long long *) ifp->if_guid);
+
+ bguid = ifp->if_guid;
+ if (!bguid[0] && !bguid[1] && !bguid[2]) {
+ /*
+ * Original incorrect GUID format in flash; fix in
+ * core copy, by shifting up 2 octets; don't need to
+ * change top octet, since both it and shifted are 0.
+ */
+ bguid[1] = bguid[3];
+ bguid[2] = bguid[4];
+ bguid[3] = 0;
+ bguid[4] = 0;
+ guid = *(__be64 *) ifp->if_guid;
+ } else
+ guid = *(__be64 *) ifp->if_guid;
+ dd->base_guid = guid;
+ dd->nguid = ifp->if_numguid;
+ /*
+ * Things are slightly complicated by the desire to transparently
+ * support both the Pathscale 10-digit serial number and the QLogic
+ * 13-character version.
+ */
+ if ((ifp->if_fversion > 1) && ifp->if_sprefix[0] &&
+ ((u8 *) ifp->if_sprefix)[0] != 0xFF) {
+ char *snp = dd->serial;
+
+ /*
+ * This board has a Serial-prefix, which is stored
+ * elsewhere for backward-compatibility.
+ */
+ memcpy(snp, ifp->if_sprefix, sizeof(ifp->if_sprefix));
+ snp[sizeof(ifp->if_sprefix)] = '\0';
+ len = strlen(snp);
+ snp += len;
+ len = sizeof(dd->serial) - len;
+ if (len > sizeof(ifp->if_serial))
+ len = sizeof(ifp->if_serial);
+ memcpy(snp, ifp->if_serial, len);
+ } else {
+ memcpy(dd->serial, ifp->if_serial, sizeof(ifp->if_serial));
+ }
+ if (!strstr(ifp->if_comment, "Tested successfully"))
+ qib_dev_err(dd,
+ "Board SN %s did not pass functional test: %s\n",
+ dd->serial, ifp->if_comment);
+
+done:
+ vfree(buf);
+
+bail:;
+}
+