457 lines
13 KiB
C
457 lines
13 KiB
C
/*
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* Copyright (c) 2012 Intel Corporation. All rights reserved.
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* Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
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* Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/vmalloc.h>
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#include "qib.h"
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/*
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* Functions specific to the serial EEPROM on cards handled by ib_qib.
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* The actual serail interface code is in qib_twsi.c. This file is a client
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*/
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/**
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* qib_eeprom_read - receives bytes from the eeprom via I2C
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* @dd: the qlogic_ib device
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* @eeprom_offset: address to read from
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* @buffer: where to store result
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* @len: number of bytes to receive
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*/
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int qib_eeprom_read(struct qib_devdata *dd, u8 eeprom_offset,
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void *buff, int len)
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{
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int ret;
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ret = mutex_lock_interruptible(&dd->eep_lock);
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if (!ret) {
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ret = qib_twsi_reset(dd);
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if (ret)
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qib_dev_err(dd, "EEPROM Reset for read failed\n");
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else
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ret = qib_twsi_blk_rd(dd, dd->twsi_eeprom_dev,
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eeprom_offset, buff, len);
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mutex_unlock(&dd->eep_lock);
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}
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return ret;
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}
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/*
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* Actually update the eeprom, first doing write enable if
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* needed, then restoring write enable state.
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* Must be called with eep_lock held
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*/
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static int eeprom_write_with_enable(struct qib_devdata *dd, u8 offset,
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const void *buf, int len)
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{
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int ret, pwen;
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pwen = dd->f_eeprom_wen(dd, 1);
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ret = qib_twsi_reset(dd);
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if (ret)
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qib_dev_err(dd, "EEPROM Reset for write failed\n");
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else
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ret = qib_twsi_blk_wr(dd, dd->twsi_eeprom_dev,
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offset, buf, len);
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dd->f_eeprom_wen(dd, pwen);
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return ret;
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}
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/**
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* qib_eeprom_write - writes data to the eeprom via I2C
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* @dd: the qlogic_ib device
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* @eeprom_offset: where to place data
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* @buffer: data to write
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* @len: number of bytes to write
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*/
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int qib_eeprom_write(struct qib_devdata *dd, u8 eeprom_offset,
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const void *buff, int len)
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{
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int ret;
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ret = mutex_lock_interruptible(&dd->eep_lock);
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if (!ret) {
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ret = eeprom_write_with_enable(dd, eeprom_offset, buff, len);
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mutex_unlock(&dd->eep_lock);
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}
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return ret;
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}
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static u8 flash_csum(struct qib_flash *ifp, int adjust)
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{
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u8 *ip = (u8 *) ifp;
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u8 csum = 0, len;
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/*
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* Limit length checksummed to max length of actual data.
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* Checksum of erased eeprom will still be bad, but we avoid
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* reading past the end of the buffer we were passed.
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*/
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len = ifp->if_length;
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if (len > sizeof(struct qib_flash))
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len = sizeof(struct qib_flash);
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while (len--)
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csum += *ip++;
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csum -= ifp->if_csum;
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csum = ~csum;
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if (adjust)
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ifp->if_csum = csum;
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return csum;
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}
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/**
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* qib_get_eeprom_info- get the GUID et al. from the TSWI EEPROM device
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* @dd: the qlogic_ib device
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*
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* We have the capability to use the nguid field, and get
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* the guid from the first chip's flash, to use for all of them.
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*/
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void qib_get_eeprom_info(struct qib_devdata *dd)
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{
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void *buf;
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struct qib_flash *ifp;
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__be64 guid;
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int len, eep_stat;
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u8 csum, *bguid;
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int t = dd->unit;
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struct qib_devdata *dd0 = qib_lookup(0);
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if (t && dd0->nguid > 1 && t <= dd0->nguid) {
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u8 oguid;
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dd->base_guid = dd0->base_guid;
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bguid = (u8 *) &dd->base_guid;
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oguid = bguid[7];
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bguid[7] += t;
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if (oguid > bguid[7]) {
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if (bguid[6] == 0xff) {
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if (bguid[5] == 0xff) {
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qib_dev_err(dd,
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"Can't set %s GUID from base, wraps to OUI!\n",
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qib_get_unit_name(t));
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dd->base_guid = 0;
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goto bail;
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}
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bguid[5]++;
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}
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bguid[6]++;
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}
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dd->nguid = 1;
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goto bail;
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}
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/*
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* Read full flash, not just currently used part, since it may have
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* been written with a newer definition.
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* */
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len = sizeof(struct qib_flash);
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buf = vmalloc(len);
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if (!buf) {
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qib_dev_err(dd,
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"Couldn't allocate memory to read %u bytes from eeprom for GUID\n",
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len);
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goto bail;
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}
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/*
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* Use "public" eeprom read function, which does locking and
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* figures out device. This will migrate to chip-specific.
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*/
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eep_stat = qib_eeprom_read(dd, 0, buf, len);
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if (eep_stat) {
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qib_dev_err(dd, "Failed reading GUID from eeprom\n");
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goto done;
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}
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ifp = (struct qib_flash *)buf;
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csum = flash_csum(ifp, 0);
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if (csum != ifp->if_csum) {
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qib_devinfo(dd->pcidev,
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"Bad I2C flash checksum: 0x%x, not 0x%x\n",
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csum, ifp->if_csum);
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goto done;
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}
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if (*(__be64 *) ifp->if_guid == cpu_to_be64(0) ||
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*(__be64 *) ifp->if_guid == ~cpu_to_be64(0)) {
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qib_dev_err(dd,
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"Invalid GUID %llx from flash; ignoring\n",
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*(unsigned long long *) ifp->if_guid);
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/* don't allow GUID if all 0 or all 1's */
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goto done;
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}
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/* complain, but allow it */
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if (*(u64 *) ifp->if_guid == 0x100007511000000ULL)
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qib_devinfo(dd->pcidev,
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"Warning, GUID %llx is default, probably not correct!\n",
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*(unsigned long long *) ifp->if_guid);
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bguid = ifp->if_guid;
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if (!bguid[0] && !bguid[1] && !bguid[2]) {
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/*
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* Original incorrect GUID format in flash; fix in
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* core copy, by shifting up 2 octets; don't need to
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* change top octet, since both it and shifted are 0.
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*/
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bguid[1] = bguid[3];
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bguid[2] = bguid[4];
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bguid[3] = 0;
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bguid[4] = 0;
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guid = *(__be64 *) ifp->if_guid;
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} else
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guid = *(__be64 *) ifp->if_guid;
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dd->base_guid = guid;
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dd->nguid = ifp->if_numguid;
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/*
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* Things are slightly complicated by the desire to transparently
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* support both the Pathscale 10-digit serial number and the QLogic
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* 13-character version.
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*/
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if ((ifp->if_fversion > 1) && ifp->if_sprefix[0] &&
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((u8 *) ifp->if_sprefix)[0] != 0xFF) {
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char *snp = dd->serial;
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/*
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* This board has a Serial-prefix, which is stored
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* elsewhere for backward-compatibility.
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*/
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memcpy(snp, ifp->if_sprefix, sizeof ifp->if_sprefix);
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snp[sizeof ifp->if_sprefix] = '\0';
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len = strlen(snp);
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snp += len;
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len = (sizeof dd->serial) - len;
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if (len > sizeof ifp->if_serial)
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len = sizeof ifp->if_serial;
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memcpy(snp, ifp->if_serial, len);
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} else
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memcpy(dd->serial, ifp->if_serial,
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sizeof ifp->if_serial);
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if (!strstr(ifp->if_comment, "Tested successfully"))
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qib_dev_err(dd,
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"Board SN %s did not pass functional test: %s\n",
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dd->serial, ifp->if_comment);
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memcpy(&dd->eep_st_errs, &ifp->if_errcntp, QIB_EEP_LOG_CNT);
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/*
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* Power-on (actually "active") hours are kept as little-endian value
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* in EEPROM, but as seconds in a (possibly as small as 24-bit)
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* atomic_t while running.
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*/
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atomic_set(&dd->active_time, 0);
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dd->eep_hrs = ifp->if_powerhour[0] | (ifp->if_powerhour[1] << 8);
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done:
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vfree(buf);
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bail:;
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}
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/**
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* qib_update_eeprom_log - copy active-time and error counters to eeprom
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* @dd: the qlogic_ib device
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*
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* Although the time is kept as seconds in the qib_devdata struct, it is
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* rounded to hours for re-write, as we have only 16 bits in EEPROM.
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* First-cut code reads whole (expected) struct qib_flash, modifies,
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* re-writes. Future direction: read/write only what we need, assuming
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* that the EEPROM had to have been "good enough" for driver init, and
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* if not, we aren't making it worse.
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*
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*/
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int qib_update_eeprom_log(struct qib_devdata *dd)
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{
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void *buf;
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struct qib_flash *ifp;
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int len, hi_water;
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uint32_t new_time, new_hrs;
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u8 csum;
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int ret, idx;
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unsigned long flags;
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/* first, check if we actually need to do anything. */
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ret = 0;
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for (idx = 0; idx < QIB_EEP_LOG_CNT; ++idx) {
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if (dd->eep_st_new_errs[idx]) {
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ret = 1;
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break;
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}
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}
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new_time = atomic_read(&dd->active_time);
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if (ret == 0 && new_time < 3600)
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goto bail;
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/*
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* The quick-check above determined that there is something worthy
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* of logging, so get current contents and do a more detailed idea.
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* read full flash, not just currently used part, since it may have
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* been written with a newer definition
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*/
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len = sizeof(struct qib_flash);
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buf = vmalloc(len);
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ret = 1;
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if (!buf) {
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qib_dev_err(dd,
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"Couldn't allocate memory to read %u bytes from eeprom for logging\n",
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len);
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goto bail;
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}
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/* Grab semaphore and read current EEPROM. If we get an
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* error, let go, but if not, keep it until we finish write.
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*/
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ret = mutex_lock_interruptible(&dd->eep_lock);
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if (ret) {
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qib_dev_err(dd, "Unable to acquire EEPROM for logging\n");
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goto free_bail;
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}
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ret = qib_twsi_blk_rd(dd, dd->twsi_eeprom_dev, 0, buf, len);
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if (ret) {
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mutex_unlock(&dd->eep_lock);
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qib_dev_err(dd, "Unable read EEPROM for logging\n");
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goto free_bail;
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}
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ifp = (struct qib_flash *)buf;
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csum = flash_csum(ifp, 0);
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if (csum != ifp->if_csum) {
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mutex_unlock(&dd->eep_lock);
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qib_dev_err(dd, "EEPROM cks err (0x%02X, S/B 0x%02X)\n",
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csum, ifp->if_csum);
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ret = 1;
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goto free_bail;
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}
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hi_water = 0;
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spin_lock_irqsave(&dd->eep_st_lock, flags);
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for (idx = 0; idx < QIB_EEP_LOG_CNT; ++idx) {
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int new_val = dd->eep_st_new_errs[idx];
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if (new_val) {
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/*
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* If we have seen any errors, add to EEPROM values
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* We need to saturate at 0xFF (255) and we also
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* would need to adjust the checksum if we were
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* trying to minimize EEPROM traffic
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* Note that we add to actual current count in EEPROM,
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* in case it was altered while we were running.
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*/
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new_val += ifp->if_errcntp[idx];
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if (new_val > 0xFF)
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new_val = 0xFF;
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if (ifp->if_errcntp[idx] != new_val) {
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ifp->if_errcntp[idx] = new_val;
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hi_water = offsetof(struct qib_flash,
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if_errcntp) + idx;
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}
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/*
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* update our shadow (used to minimize EEPROM
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* traffic), to match what we are about to write.
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*/
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dd->eep_st_errs[idx] = new_val;
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dd->eep_st_new_errs[idx] = 0;
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}
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}
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/*
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* Now update active-time. We would like to round to the nearest hour
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* but unless atomic_t are sure to be proper signed ints we cannot,
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* because we need to account for what we "transfer" to EEPROM and
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* if we log an hour at 31 minutes, then we would need to set
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* active_time to -29 to accurately count the _next_ hour.
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*/
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if (new_time >= 3600) {
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new_hrs = new_time / 3600;
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atomic_sub((new_hrs * 3600), &dd->active_time);
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new_hrs += dd->eep_hrs;
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if (new_hrs > 0xFFFF)
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new_hrs = 0xFFFF;
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dd->eep_hrs = new_hrs;
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if ((new_hrs & 0xFF) != ifp->if_powerhour[0]) {
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ifp->if_powerhour[0] = new_hrs & 0xFF;
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hi_water = offsetof(struct qib_flash, if_powerhour);
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}
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if ((new_hrs >> 8) != ifp->if_powerhour[1]) {
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ifp->if_powerhour[1] = new_hrs >> 8;
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hi_water = offsetof(struct qib_flash, if_powerhour) + 1;
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}
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}
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/*
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* There is a tiny possibility that we could somehow fail to write
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* the EEPROM after updating our shadows, but problems from holding
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* the spinlock too long are a much bigger issue.
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*/
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spin_unlock_irqrestore(&dd->eep_st_lock, flags);
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if (hi_water) {
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/* we made some change to the data, uopdate cksum and write */
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csum = flash_csum(ifp, 1);
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ret = eeprom_write_with_enable(dd, 0, buf, hi_water + 1);
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}
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mutex_unlock(&dd->eep_lock);
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if (ret)
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qib_dev_err(dd, "Failed updating EEPROM\n");
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free_bail:
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vfree(buf);
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bail:
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return ret;
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}
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/**
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* qib_inc_eeprom_err - increment one of the four error counters
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* that are logged to EEPROM.
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* @dd: the qlogic_ib device
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* @eidx: 0..3, the counter to increment
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* @incr: how much to add
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*
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* Each counter is 8-bits, and saturates at 255 (0xFF). They
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* are copied to the EEPROM (aka flash) whenever qib_update_eeprom_log()
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* is called, but it can only be called in a context that allows sleep.
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* This function can be called even at interrupt level.
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*/
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void qib_inc_eeprom_err(struct qib_devdata *dd, u32 eidx, u32 incr)
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{
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uint new_val;
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unsigned long flags;
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spin_lock_irqsave(&dd->eep_st_lock, flags);
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new_val = dd->eep_st_new_errs[eidx] + incr;
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if (new_val > 255)
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new_val = 255;
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dd->eep_st_new_errs[eidx] = new_val;
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spin_unlock_irqrestore(&dd->eep_st_lock, flags);
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}
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