diff options
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_qsfp.c')
-rw-r--r-- | drivers/infiniband/hw/qib/qib_qsfp.c | 549 |
1 files changed, 549 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/qib/qib_qsfp.c b/drivers/infiniband/hw/qib/qib_qsfp.c new file mode 100644 index 0000000000..295d40a83b --- /dev/null +++ b/drivers/infiniband/hw/qib/qib_qsfp.c @@ -0,0 +1,549 @@ +/* + * 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" +#include "qib_qsfp.h" + +/* + * QSFP support for ib_qib driver, using "Two Wire Serial Interface" driver + * in qib_twsi.c + */ +#define QSFP_MAX_RETRY 4 + +static int qsfp_read(struct qib_pportdata *ppd, int addr, void *bp, int len) +{ + struct qib_devdata *dd = ppd->dd; + u32 out, mask; + int ret, cnt, pass = 0; + int stuck = 0; + u8 *buff = bp; + + ret = mutex_lock_interruptible(&dd->eep_lock); + if (ret) + goto no_unlock; + + if (dd->twsi_eeprom_dev == QIB_TWSI_NO_DEV) { + ret = -ENXIO; + goto bail; + } + + /* + * We presume, if we are called at all, that this board has + * QSFP. This is on the same i2c chain as the legacy parts, + * but only responds if the module is selected via GPIO pins. + * Further, there are very long setup and hold requirements + * on MODSEL. + */ + mask = QSFP_GPIO_MOD_SEL_N | QSFP_GPIO_MOD_RST_N | QSFP_GPIO_LP_MODE; + out = QSFP_GPIO_MOD_RST_N | QSFP_GPIO_LP_MODE; + if (ppd->hw_pidx) { + mask <<= QSFP_GPIO_PORT2_SHIFT; + out <<= QSFP_GPIO_PORT2_SHIFT; + } + + dd->f_gpio_mod(dd, out, mask, mask); + + /* + * Module could take up to 2 Msec to respond to MOD_SEL, and there + * is no way to tell if it is ready, so we must wait. + */ + msleep(20); + + /* Make sure TWSI bus is in sane state. */ + ret = qib_twsi_reset(dd); + if (ret) { + qib_dev_porterr(dd, ppd->port, + "QSFP interface Reset for read failed\n"); + ret = -EIO; + stuck = 1; + goto deselect; + } + + /* All QSFP modules are at A0 */ + + cnt = 0; + while (cnt < len) { + unsigned in_page; + int wlen = len - cnt; + + in_page = addr % QSFP_PAGESIZE; + if ((in_page + wlen) > QSFP_PAGESIZE) + wlen = QSFP_PAGESIZE - in_page; + ret = qib_twsi_blk_rd(dd, QSFP_DEV, addr, buff + cnt, wlen); + /* Some QSFP's fail first try. Retry as experiment */ + if (ret && cnt == 0 && ++pass < QSFP_MAX_RETRY) + continue; + if (ret) { + /* qib_twsi_blk_rd() 1 for error, else 0 */ + ret = -EIO; + goto deselect; + } + addr += wlen; + cnt += wlen; + } + ret = cnt; + +deselect: + /* + * Module could take up to 10 uSec after transfer before + * ready to respond to MOD_SEL negation, and there is no way + * to tell if it is ready, so we must wait. + */ + udelay(10); + /* set QSFP MODSEL, RST. LP all high */ + dd->f_gpio_mod(dd, mask, mask, mask); + + /* + * Module could take up to 2 Msec to respond to MOD_SEL + * going away, and there is no way to tell if it is ready. + * so we must wait. + */ + if (stuck) + qib_dev_err(dd, "QSFP interface bus stuck non-idle\n"); + + if (pass >= QSFP_MAX_RETRY && ret) + qib_dev_porterr(dd, ppd->port, "QSFP failed even retrying\n"); + else if (pass) + qib_dev_porterr(dd, ppd->port, "QSFP retries: %d\n", pass); + + msleep(20); + +bail: + mutex_unlock(&dd->eep_lock); + +no_unlock: + return ret; +} + +/* + * qsfp_write + * We do not ordinarily write the QSFP, but this is needed to select + * the page on non-flat QSFPs, and possibly later unusual cases + */ +static int qib_qsfp_write(struct qib_pportdata *ppd, int addr, void *bp, + int len) +{ + struct qib_devdata *dd = ppd->dd; + u32 out, mask; + int ret, cnt; + u8 *buff = bp; + + ret = mutex_lock_interruptible(&dd->eep_lock); + if (ret) + goto no_unlock; + + if (dd->twsi_eeprom_dev == QIB_TWSI_NO_DEV) { + ret = -ENXIO; + goto bail; + } + + /* + * We presume, if we are called at all, that this board has + * QSFP. This is on the same i2c chain as the legacy parts, + * but only responds if the module is selected via GPIO pins. + * Further, there are very long setup and hold requirements + * on MODSEL. + */ + mask = QSFP_GPIO_MOD_SEL_N | QSFP_GPIO_MOD_RST_N | QSFP_GPIO_LP_MODE; + out = QSFP_GPIO_MOD_RST_N | QSFP_GPIO_LP_MODE; + if (ppd->hw_pidx) { + mask <<= QSFP_GPIO_PORT2_SHIFT; + out <<= QSFP_GPIO_PORT2_SHIFT; + } + dd->f_gpio_mod(dd, out, mask, mask); + + /* + * Module could take up to 2 Msec to respond to MOD_SEL, + * and there is no way to tell if it is ready, so we must wait. + */ + msleep(20); + + /* Make sure TWSI bus is in sane state. */ + ret = qib_twsi_reset(dd); + if (ret) { + qib_dev_porterr(dd, ppd->port, + "QSFP interface Reset for write failed\n"); + ret = -EIO; + goto deselect; + } + + /* All QSFP modules are at A0 */ + + cnt = 0; + while (cnt < len) { + unsigned in_page; + int wlen = len - cnt; + + in_page = addr % QSFP_PAGESIZE; + if ((in_page + wlen) > QSFP_PAGESIZE) + wlen = QSFP_PAGESIZE - in_page; + ret = qib_twsi_blk_wr(dd, QSFP_DEV, addr, buff + cnt, wlen); + if (ret) { + /* qib_twsi_blk_wr() 1 for error, else 0 */ + ret = -EIO; + goto deselect; + } + addr += wlen; + cnt += wlen; + } + ret = cnt; + +deselect: + /* + * Module could take up to 10 uSec after transfer before + * ready to respond to MOD_SEL negation, and there is no way + * to tell if it is ready, so we must wait. + */ + udelay(10); + /* set QSFP MODSEL, RST, LP high */ + dd->f_gpio_mod(dd, mask, mask, mask); + /* + * Module could take up to 2 Msec to respond to MOD_SEL + * going away, and there is no way to tell if it is ready. + * so we must wait. + */ + msleep(20); + +bail: + mutex_unlock(&dd->eep_lock); + +no_unlock: + return ret; +} + +/* + * For validation, we want to check the checksums, even of the + * fields we do not otherwise use. This function reads the bytes from + * <first> to <next-1> and returns the 8lsbs of the sum, or <0 for errors + */ +static int qsfp_cks(struct qib_pportdata *ppd, int first, int next) +{ + int ret; + u16 cks; + u8 bval; + + cks = 0; + while (first < next) { + ret = qsfp_read(ppd, first, &bval, 1); + if (ret < 0) + goto bail; + cks += bval; + ++first; + } + ret = cks & 0xFF; +bail: + return ret; + +} + +int qib_refresh_qsfp_cache(struct qib_pportdata *ppd, struct qib_qsfp_cache *cp) +{ + int ret; + int idx; + u16 cks; + u8 peek[4]; + + /* ensure sane contents on invalid reads, for cable swaps */ + memset(cp, 0, sizeof(*cp)); + + if (!qib_qsfp_mod_present(ppd)) { + ret = -ENODEV; + goto bail; + } + + ret = qsfp_read(ppd, 0, peek, 3); + if (ret < 0) + goto bail; + if ((peek[0] & 0xFE) != 0x0C) + qib_dev_porterr(ppd->dd, ppd->port, + "QSFP byte0 is 0x%02X, S/B 0x0C/D\n", peek[0]); + + if ((peek[2] & 4) == 0) { + /* + * If cable is paged, rather than "flat memory", we need to + * set the page to zero, Even if it already appears to be zero. + */ + u8 poke = 0; + + ret = qib_qsfp_write(ppd, 127, &poke, 1); + udelay(50); + if (ret != 1) { + qib_dev_porterr(ppd->dd, ppd->port, + "Failed QSFP Page set\n"); + goto bail; + } + } + + ret = qsfp_read(ppd, QSFP_MOD_ID_OFFS, &cp->id, 1); + if (ret < 0) + goto bail; + if ((cp->id & 0xFE) != 0x0C) + qib_dev_porterr(ppd->dd, ppd->port, + "QSFP ID byte is 0x%02X, S/B 0x0C/D\n", cp->id); + cks = cp->id; + + ret = qsfp_read(ppd, QSFP_MOD_PWR_OFFS, &cp->pwr, 1); + if (ret < 0) + goto bail; + cks += cp->pwr; + + ret = qsfp_cks(ppd, QSFP_MOD_PWR_OFFS + 1, QSFP_MOD_LEN_OFFS); + if (ret < 0) + goto bail; + cks += ret; + + ret = qsfp_read(ppd, QSFP_MOD_LEN_OFFS, &cp->len, 1); + if (ret < 0) + goto bail; + cks += cp->len; + + ret = qsfp_read(ppd, QSFP_MOD_TECH_OFFS, &cp->tech, 1); + if (ret < 0) + goto bail; + cks += cp->tech; + + ret = qsfp_read(ppd, QSFP_VEND_OFFS, &cp->vendor, QSFP_VEND_LEN); + if (ret < 0) + goto bail; + for (idx = 0; idx < QSFP_VEND_LEN; ++idx) + cks += cp->vendor[idx]; + + ret = qsfp_read(ppd, QSFP_IBXCV_OFFS, &cp->xt_xcv, 1); + if (ret < 0) + goto bail; + cks += cp->xt_xcv; + + ret = qsfp_read(ppd, QSFP_VOUI_OFFS, &cp->oui, QSFP_VOUI_LEN); + if (ret < 0) + goto bail; + for (idx = 0; idx < QSFP_VOUI_LEN; ++idx) + cks += cp->oui[idx]; + + ret = qsfp_read(ppd, QSFP_PN_OFFS, &cp->partnum, QSFP_PN_LEN); + if (ret < 0) + goto bail; + for (idx = 0; idx < QSFP_PN_LEN; ++idx) + cks += cp->partnum[idx]; + + ret = qsfp_read(ppd, QSFP_REV_OFFS, &cp->rev, QSFP_REV_LEN); + if (ret < 0) + goto bail; + for (idx = 0; idx < QSFP_REV_LEN; ++idx) + cks += cp->rev[idx]; + + ret = qsfp_read(ppd, QSFP_ATTEN_OFFS, &cp->atten, QSFP_ATTEN_LEN); + if (ret < 0) + goto bail; + for (idx = 0; idx < QSFP_ATTEN_LEN; ++idx) + cks += cp->atten[idx]; + + ret = qsfp_cks(ppd, QSFP_ATTEN_OFFS + QSFP_ATTEN_LEN, QSFP_CC_OFFS); + if (ret < 0) + goto bail; + cks += ret; + + cks &= 0xFF; + ret = qsfp_read(ppd, QSFP_CC_OFFS, &cp->cks1, 1); + if (ret < 0) + goto bail; + if (cks != cp->cks1) + qib_dev_porterr(ppd->dd, ppd->port, + "QSFP cks1 is %02X, computed %02X\n", cp->cks1, + cks); + + /* Second checksum covers 192 to (serial, date, lot) */ + ret = qsfp_cks(ppd, QSFP_CC_OFFS + 1, QSFP_SN_OFFS); + if (ret < 0) + goto bail; + cks = ret; + + ret = qsfp_read(ppd, QSFP_SN_OFFS, &cp->serial, QSFP_SN_LEN); + if (ret < 0) + goto bail; + for (idx = 0; idx < QSFP_SN_LEN; ++idx) + cks += cp->serial[idx]; + + ret = qsfp_read(ppd, QSFP_DATE_OFFS, &cp->date, QSFP_DATE_LEN); + if (ret < 0) + goto bail; + for (idx = 0; idx < QSFP_DATE_LEN; ++idx) + cks += cp->date[idx]; + + ret = qsfp_read(ppd, QSFP_LOT_OFFS, &cp->lot, QSFP_LOT_LEN); + if (ret < 0) + goto bail; + for (idx = 0; idx < QSFP_LOT_LEN; ++idx) + cks += cp->lot[idx]; + + ret = qsfp_cks(ppd, QSFP_LOT_OFFS + QSFP_LOT_LEN, QSFP_CC_EXT_OFFS); + if (ret < 0) + goto bail; + cks += ret; + + ret = qsfp_read(ppd, QSFP_CC_EXT_OFFS, &cp->cks2, 1); + if (ret < 0) + goto bail; + cks &= 0xFF; + if (cks != cp->cks2) + qib_dev_porterr(ppd->dd, ppd->port, + "QSFP cks2 is %02X, computed %02X\n", cp->cks2, + cks); + return 0; + +bail: + cp->id = 0; + return ret; +} + +const char * const qib_qsfp_devtech[16] = { + "850nm VCSEL", "1310nm VCSEL", "1550nm VCSEL", "1310nm FP", + "1310nm DFB", "1550nm DFB", "1310nm EML", "1550nm EML", + "Cu Misc", "1490nm DFB", "Cu NoEq", "Cu Eq", + "Undef", "Cu Active BothEq", "Cu FarEq", "Cu NearEq" +}; + +#define QSFP_DUMP_CHUNK 16 /* Holds longest string */ +#define QSFP_DEFAULT_HDR_CNT 224 + +static const char *pwr_codes = "1.5W2.0W2.5W3.5W"; + +int qib_qsfp_mod_present(struct qib_pportdata *ppd) +{ + u32 mask; + int ret; + + mask = QSFP_GPIO_MOD_PRS_N << + (ppd->hw_pidx * QSFP_GPIO_PORT2_SHIFT); + ret = ppd->dd->f_gpio_mod(ppd->dd, 0, 0, 0); + + return !((ret & mask) >> + ((ppd->hw_pidx * QSFP_GPIO_PORT2_SHIFT) + 3)); +} + +/* + * Initialize structures that control access to QSFP. Called once per port + * on cards that support QSFP. + */ +void qib_qsfp_init(struct qib_qsfp_data *qd, + void (*fevent)(struct work_struct *)) +{ + u32 mask, highs; + + struct qib_devdata *dd = qd->ppd->dd; + + /* Initialize work struct for later QSFP events */ + INIT_WORK(&qd->work, fevent); + + /* + * Later, we may want more validation. For now, just set up pins and + * blip reset. If module is present, call qib_refresh_qsfp_cache(), + * to do further init. + */ + mask = QSFP_GPIO_MOD_SEL_N | QSFP_GPIO_MOD_RST_N | QSFP_GPIO_LP_MODE; + highs = mask - QSFP_GPIO_MOD_RST_N; + if (qd->ppd->hw_pidx) { + mask <<= QSFP_GPIO_PORT2_SHIFT; + highs <<= QSFP_GPIO_PORT2_SHIFT; + } + dd->f_gpio_mod(dd, highs, mask, mask); + udelay(20); /* Generous RST dwell */ + + dd->f_gpio_mod(dd, mask, mask, mask); +} + +int qib_qsfp_dump(struct qib_pportdata *ppd, char *buf, int len) +{ + struct qib_qsfp_cache cd; + u8 bin_buff[QSFP_DUMP_CHUNK]; + char lenstr[6]; + int sofar, ret; + int bidx = 0; + + sofar = 0; + ret = qib_refresh_qsfp_cache(ppd, &cd); + if (ret < 0) + goto bail; + + lenstr[0] = ' '; + lenstr[1] = '\0'; + if (QSFP_IS_CU(cd.tech)) + sprintf(lenstr, "%dM ", cd.len); + + sofar += scnprintf(buf + sofar, len - sofar, "PWR:%.3sW\n", pwr_codes + + (QSFP_PWR(cd.pwr) * 4)); + + sofar += scnprintf(buf + sofar, len - sofar, "TECH:%s%s\n", lenstr, + qib_qsfp_devtech[cd.tech >> 4]); + + sofar += scnprintf(buf + sofar, len - sofar, "Vendor:%.*s\n", + QSFP_VEND_LEN, cd.vendor); + + sofar += scnprintf(buf + sofar, len - sofar, "OUI:%06X\n", + QSFP_OUI(cd.oui)); + + sofar += scnprintf(buf + sofar, len - sofar, "Part#:%.*s\n", + QSFP_PN_LEN, cd.partnum); + sofar += scnprintf(buf + sofar, len - sofar, "Rev:%.*s\n", + QSFP_REV_LEN, cd.rev); + if (QSFP_IS_CU(cd.tech)) + sofar += scnprintf(buf + sofar, len - sofar, "Atten:%d, %d\n", + QSFP_ATTEN_SDR(cd.atten), + QSFP_ATTEN_DDR(cd.atten)); + sofar += scnprintf(buf + sofar, len - sofar, "Serial:%.*s\n", + QSFP_SN_LEN, cd.serial); + sofar += scnprintf(buf + sofar, len - sofar, "Date:%.*s\n", + QSFP_DATE_LEN, cd.date); + sofar += scnprintf(buf + sofar, len - sofar, "Lot:%.*s\n", + QSFP_LOT_LEN, cd.lot); + + while (bidx < QSFP_DEFAULT_HDR_CNT) { + int iidx; + + ret = qsfp_read(ppd, bidx, bin_buff, QSFP_DUMP_CHUNK); + if (ret < 0) + goto bail; + for (iidx = 0; iidx < ret; ++iidx) { + sofar += scnprintf(buf + sofar, len-sofar, " %02X", + bin_buff[iidx]); + } + sofar += scnprintf(buf + sofar, len - sofar, "\n"); + bidx += QSFP_DUMP_CHUNK; + } + ret = sofar; +bail: + return ret; +} |