1 files changed, 451 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 000000000000..92d9cfe98a68
--- /dev/null
+++ b/drivers/infiniband/hw/qib/qib_eeprom.c
@@ -0,0 +1,451 @@
+/*
+ * Copyright (c) 2006, 2007, 2008, 2009 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
+ * @buffer: 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
+ * @buffer: 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 %s GUID"
+                                                    " from base, wraps to"
+                                                    " OUI!\n",
+                                                    qib_get_unit_name(t));
+                                        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) {
+                qib_dev_err(dd, "Couldn't allocate memory to read %u "
+                            "bytes from eeprom for GUID\n", len);
+                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);
+
+        memcpy(&dd->eep_st_errs, &ifp->if_errcntp, QIB_EEP_LOG_CNT);
+        /*
+         * Power-on (actually "active") hours are kept as little-endian value
+         * in EEPROM, but as seconds in a (possibly as small as 24-bit)
+         * atomic_t while running.
+         */
+        atomic_set(&dd->active_time, 0);
+        dd->eep_hrs = ifp->if_powerhour[0] | (ifp->if_powerhour[1] << 8);
+
+done:
+        vfree(buf);
+
+bail:;
+}
+
+/**
+ * qib_update_eeprom_log - copy active-time and error counters to eeprom
+ * @dd: the qlogic_ib device
+ *
+ * Although the time is kept as seconds in the qib_devdata struct, it is
+ * rounded to hours for re-write, as we have only 16 bits in EEPROM.
+ * First-cut code reads whole (expected) struct qib_flash, modifies,
+ * re-writes. Future direction: read/write only what we need, assuming
+ * that the EEPROM had to have been "good enough" for driver init, and
+ * if not, we aren't making it worse.
+ *
+ */
+int qib_update_eeprom_log(struct qib_devdata *dd)
+{
+        void *buf;
+        struct qib_flash *ifp;
+        int len, hi_water;
+        uint32_t new_time, new_hrs;
+        u8 csum;
+        int ret, idx;
+        unsigned long flags;
+
+        /* first, check if we actually need to do anything. */
+        ret = 0;
+        for (idx = 0; idx < QIB_EEP_LOG_CNT; ++idx) {
+                if (dd->eep_st_new_errs[idx]) {
+                        ret = 1;
+                        break;
+                }
+        }
+        new_time = atomic_read(&dd->active_time);
+
+        if (ret == 0 && new_time < 3600)
+                goto bail;
+
+        /*
+         * The quick-check above determined that there is something worthy
+         * of logging, so get current contents and do a more detailed idea.
+         * 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);
+        ret = 1;
+        if (!buf) {
+                qib_dev_err(dd, "Couldn't allocate memory to read %u "
+                            "bytes from eeprom for logging\n", len);
+                goto bail;
+        }
+
+        /* Grab semaphore and read current EEPROM. If we get an
+         * error, let go, but if not, keep it until we finish write.
+         */
+        ret = mutex_lock_interruptible(&dd->eep_lock);
+        if (ret) {
+                qib_dev_err(dd, "Unable to acquire EEPROM for logging\n");
+                goto free_bail;
+        }
+        ret = qib_twsi_blk_rd(dd, dd->twsi_eeprom_dev, 0, buf, len);
+        if (ret) {
+                mutex_unlock(&dd->eep_lock);
+                qib_dev_err(dd, "Unable read EEPROM for logging\n");
+                goto free_bail;
+        }
+        ifp = (struct qib_flash *)buf;
+
+        csum = flash_csum(ifp, 0);
+        if (csum != ifp->if_csum) {
+                mutex_unlock(&dd->eep_lock);
+                qib_dev_err(dd, "EEPROM cks err (0x%02X, S/B 0x%02X)\n",
+                            csum, ifp->if_csum);
+                ret = 1;
+                goto free_bail;
+        }
+        hi_water = 0;
+        spin_lock_irqsave(&dd->eep_st_lock, flags);
+        for (idx = 0; idx < QIB_EEP_LOG_CNT; ++idx) {
+                int new_val = dd->eep_st_new_errs[idx];
+                if (new_val) {
+                        /*
+                         * If we have seen any errors, add to EEPROM values
+                         * We need to saturate at 0xFF (255) and we also
+                         * would need to adjust the checksum if we were
+                         * trying to minimize EEPROM traffic
+                         * Note that we add to actual current count in EEPROM,
+                         * in case it was altered while we were running.
+                         */
+                        new_val += ifp->if_errcntp[idx];
+                        if (new_val > 0xFF)
+                                new_val = 0xFF;
+                        if (ifp->if_errcntp[idx] != new_val) {
+                                ifp->if_errcntp[idx] = new_val;
+                                hi_water = offsetof(struct qib_flash,
+                                                    if_errcntp) + idx;
+                        }
+                        /*
+                         * update our shadow (used to minimize EEPROM
+                         * traffic), to match what we are about to write.
+                         */
+                        dd->eep_st_errs[idx] = new_val;
+                        dd->eep_st_new_errs[idx] = 0;
+                }
+        }
+        /*
+         * Now update active-time. We would like to round to the nearest hour
+         * but unless atomic_t are sure to be proper signed ints we cannot,
+         * because we need to account for what we "transfer" to EEPROM and
+         * if we log an hour at 31 minutes, then we would need to set
+         * active_time to -29 to accurately count the _next_ hour.
+         */
+        if (new_time >= 3600) {
+                new_hrs = new_time / 3600;
+                atomic_sub((new_hrs * 3600), &dd->active_time);
+                new_hrs += dd->eep_hrs;
+                if (new_hrs > 0xFFFF)
+                        new_hrs = 0xFFFF;
+                dd->eep_hrs = new_hrs;
+                if ((new_hrs & 0xFF) != ifp->if_powerhour[0]) {
+                        ifp->if_powerhour[0] = new_hrs & 0xFF;
+                        hi_water = offsetof(struct qib_flash, if_powerhour);
+                }
+                if ((new_hrs >> 8) != ifp->if_powerhour[1]) {
+                        ifp->if_powerhour[1] = new_hrs >> 8;
+                        hi_water = offsetof(struct qib_flash, if_powerhour) + 1;
+                }
+        }
+        /*
+         * There is a tiny possibility that we could somehow fail to write
+         * the EEPROM after updating our shadows, but problems from holding
+         * the spinlock too long are a much bigger issue.
+         */
+        spin_unlock_irqrestore(&dd->eep_st_lock, flags);
+        if (hi_water) {
+                /* we made some change to the data, uopdate cksum and write */
+                csum = flash_csum(ifp, 1);
+                ret = eeprom_write_with_enable(dd, 0, buf, hi_water + 1);
+        }
+        mutex_unlock(&dd->eep_lock);
+        if (ret)
+                qib_dev_err(dd, "Failed updating EEPROM\n");
+
+free_bail:
+        vfree(buf);
+bail:
+        return ret;
+}
+
+/**
+ * qib_inc_eeprom_err - increment one of the four error counters
+ * that are logged to EEPROM.
+ * @dd: the qlogic_ib device
+ * @eidx: 0..3, the counter to increment
+ * @incr: how much to add
+ *
+ * Each counter is 8-bits, and saturates at 255 (0xFF). They
+ * are copied to the EEPROM (aka flash) whenever qib_update_eeprom_log()
+ * is called, but it can only be called in a context that allows sleep.
+ * This function can be called even at interrupt level.
+ */
+void qib_inc_eeprom_err(struct qib_devdata *dd, u32 eidx, u32 incr)
+{
+        uint new_val;
+        unsigned long flags;
+
+        spin_lock_irqsave(&dd->eep_st_lock, flags);
+        new_val = dd->eep_st_new_errs[eidx] + incr;
+        if (new_val > 255)
+                new_val = 255;
+        dd->eep_st_new_errs[eidx] = new_val;
+        spin_unlock_irqrestore(&dd->eep_st_lock, flags);
+}