diff options
Diffstat (limited to 'drivers/staging/rdma/hfi1/qsfp.c')
| -rw-r--r-- | drivers/staging/rdma/hfi1/qsfp.c | 546 |
1 files changed, 546 insertions, 0 deletions
diff --git a/drivers/staging/rdma/hfi1/qsfp.c b/drivers/staging/rdma/hfi1/qsfp.c new file mode 100644 index 000000000000..3138936157db --- /dev/null +++ b/drivers/staging/rdma/hfi1/qsfp.c @@ -0,0 +1,546 @@ +/* + * + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2015 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * BSD LICENSE + * + * Copyright(c) 2015 Intel Corporation. + * + * 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. + * - Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include <linux/delay.h> +#include <linux/pci.h> +#include <linux/vmalloc.h> + +#include "hfi.h" +#include "twsi.h" + +/* + * QSFP support for hfi driver, using "Two Wire Serial Interface" driver + * in twsi.c + */ +#define I2C_MAX_RETRY 4 + +/* + * Unlocked i2c write. Must hold dd->qsfp_i2c_mutex. + */ +static int __i2c_write(struct hfi1_pportdata *ppd, u32 target, int i2c_addr, + int offset, void *bp, int len) +{ + struct hfi1_devdata *dd = ppd->dd; + int ret, cnt; + u8 *buff = bp; + + /* Make sure TWSI bus is in sane state. */ + ret = hfi1_twsi_reset(dd, target); + if (ret) { + hfi1_dev_porterr(dd, ppd->port, + "I2C interface Reset for write failed\n"); + return -EIO; + } + + cnt = 0; + while (cnt < len) { + int wlen = len - cnt; + + ret = hfi1_twsi_blk_wr(dd, target, i2c_addr, offset, + buff + cnt, wlen); + if (ret) { + /* hfi1_twsi_blk_wr() 1 for error, else 0 */ + return -EIO; + } + offset += wlen; + cnt += wlen; + } + + /* Must wait min 20us between qsfp i2c transactions */ + udelay(20); + + return cnt; +} + +int i2c_write(struct hfi1_pportdata *ppd, u32 target, int i2c_addr, int offset, + void *bp, int len) +{ + struct hfi1_devdata *dd = ppd->dd; + int ret; + + ret = mutex_lock_interruptible(&dd->qsfp_i2c_mutex); + if (!ret) { + ret = __i2c_write(ppd, target, i2c_addr, offset, bp, len); + mutex_unlock(&dd->qsfp_i2c_mutex); + } + + return ret; +} + +/* + * Unlocked i2c read. Must hold dd->qsfp_i2c_mutex. + */ +static int __i2c_read(struct hfi1_pportdata *ppd, u32 target, int i2c_addr, + int offset, void *bp, int len) +{ + struct hfi1_devdata *dd = ppd->dd; + int ret, cnt, pass = 0; + int stuck = 0; + u8 *buff = bp; + + /* Make sure TWSI bus is in sane state. */ + ret = hfi1_twsi_reset(dd, target); + if (ret) { + hfi1_dev_porterr(dd, ppd->port, + "I2C interface Reset for read failed\n"); + ret = -EIO; + stuck = 1; + goto exit; + } + + cnt = 0; + while (cnt < len) { + int rlen = len - cnt; + + ret = hfi1_twsi_blk_rd(dd, target, i2c_addr, offset, + buff + cnt, rlen); + /* Some QSFP's fail first try. Retry as experiment */ + if (ret && cnt == 0 && ++pass < I2C_MAX_RETRY) + continue; + if (ret) { + /* hfi1_twsi_blk_rd() 1 for error, else 0 */ + ret = -EIO; + goto exit; + } + offset += rlen; + cnt += rlen; + } + + ret = cnt; + +exit: + if (stuck) + dd_dev_err(dd, "I2C interface bus stuck non-idle\n"); + + if (pass >= I2C_MAX_RETRY && ret) + hfi1_dev_porterr(dd, ppd->port, + "I2C failed even retrying\n"); + else if (pass) + hfi1_dev_porterr(dd, ppd->port, "I2C retries: %d\n", pass); + + /* Must wait min 20us between qsfp i2c transactions */ + udelay(20); + + return ret; +} + +int i2c_read(struct hfi1_pportdata *ppd, u32 target, int i2c_addr, int offset, + void *bp, int len) +{ + struct hfi1_devdata *dd = ppd->dd; + int ret; + + ret = mutex_lock_interruptible(&dd->qsfp_i2c_mutex); + if (!ret) { + ret = __i2c_read(ppd, target, i2c_addr, offset, bp, len); + mutex_unlock(&dd->qsfp_i2c_mutex); + } + + return ret; +} + +int qsfp_write(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp, + int len) +{ + int count = 0; + int offset; + int nwrite; + int ret; + u8 page; + + ret = mutex_lock_interruptible(&ppd->dd->qsfp_i2c_mutex); + if (ret) + return ret; + + while (count < len) { + /* + * Set the qsfp page based on a zero-based addresss + * and a page size of QSFP_PAGESIZE bytes. + */ + page = (u8)(addr / QSFP_PAGESIZE); + + ret = __i2c_write(ppd, target, QSFP_DEV, + QSFP_PAGE_SELECT_BYTE_OFFS, &page, 1); + if (ret != 1) { + hfi1_dev_porterr( + ppd->dd, + ppd->port, + "can't write QSFP_PAGE_SELECT_BYTE: %d\n", ret); + ret = -EIO; + break; + } + + /* truncate write to end of page if crossing page boundary */ + offset = addr % QSFP_PAGESIZE; + nwrite = len - count; + if ((offset + nwrite) > QSFP_PAGESIZE) + nwrite = QSFP_PAGESIZE - offset; + + ret = __i2c_write(ppd, target, QSFP_DEV, offset, bp + count, + nwrite); + if (ret <= 0) /* stop on error or nothing read */ + break; + + count += ret; + addr += ret; + } + + mutex_unlock(&ppd->dd->qsfp_i2c_mutex); + + if (ret < 0) + return ret; + return count; +} + +int qsfp_read(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp, + int len) +{ + int count = 0; + int offset; + int nread; + int ret; + u8 page; + + ret = mutex_lock_interruptible(&ppd->dd->qsfp_i2c_mutex); + if (ret) + return ret; + + while (count < len) { + /* + * Set the qsfp page based on a zero-based address + * and a page size of QSFP_PAGESIZE bytes. + */ + page = (u8)(addr / QSFP_PAGESIZE); + ret = __i2c_write(ppd, target, QSFP_DEV, + QSFP_PAGE_SELECT_BYTE_OFFS, &page, 1); + if (ret != 1) { + hfi1_dev_porterr( + ppd->dd, + ppd->port, + "can't write QSFP_PAGE_SELECT_BYTE: %d\n", ret); + ret = -EIO; + break; + } + + /* truncate read to end of page if crossing page boundary */ + offset = addr % QSFP_PAGESIZE; + nread = len - count; + if ((offset + nread) > QSFP_PAGESIZE) + nread = QSFP_PAGESIZE - offset; + + ret = __i2c_read(ppd, target, QSFP_DEV, offset, bp + count, + nread); + if (ret <= 0) /* stop on error or nothing read */ + break; + + count += ret; + addr += ret; + } + + mutex_unlock(&ppd->dd->qsfp_i2c_mutex); + + if (ret < 0) + return ret; + return count; +} + +/* + * This function caches the QSFP memory range in 128 byte chunks. + * As an example, the next byte after address 255 is byte 128 from + * upper page 01H (if existing) rather than byte 0 from lower page 00H. + */ +int refresh_qsfp_cache(struct hfi1_pportdata *ppd, struct qsfp_data *cp) +{ + u32 target = ppd->dd->hfi1_id; + int ret; + unsigned long flags; + u8 *cache = &cp->cache[0]; + + /* ensure sane contents on invalid reads, for cable swaps */ + memset(cache, 0, (QSFP_MAX_NUM_PAGES*128)); + dd_dev_info(ppd->dd, "%s: called\n", __func__); + if (!qsfp_mod_present(ppd)) { + ret = -ENODEV; + goto bail; + } + + ret = qsfp_read(ppd, target, 0, cache, 256); + if (ret != 256) { + dd_dev_info(ppd->dd, + "%s: Read of pages 00H failed, expected 256, got %d\n", + __func__, ret); + goto bail; + } + + if (cache[0] != 0x0C && cache[0] != 0x0D) + goto bail; + + /* Is paging enabled? */ + if (!(cache[2] & 4)) { + + /* Paging enabled, page 03 required */ + if ((cache[195] & 0xC0) == 0xC0) { + /* all */ + ret = qsfp_read(ppd, target, 384, cache + 256, 128); + if (ret <= 0 || ret != 128) { + dd_dev_info(ppd->dd, "%s: failed\n", __func__); + goto bail; + } + ret = qsfp_read(ppd, target, 640, cache + 384, 128); + if (ret <= 0 || ret != 128) { + dd_dev_info(ppd->dd, "%s: failed\n", __func__); + goto bail; + } + ret = qsfp_read(ppd, target, 896, cache + 512, 128); + if (ret <= 0 || ret != 128) { + dd_dev_info(ppd->dd, "%s: failed\n", __func__); + goto bail; + } + } else if ((cache[195] & 0x80) == 0x80) { + /* only page 2 and 3 */ + ret = qsfp_read(ppd, target, 640, cache + 384, 128); + if (ret <= 0 || ret != 128) { + dd_dev_info(ppd->dd, "%s: failed\n", __func__); + goto bail; + } + ret = qsfp_read(ppd, target, 896, cache + 512, 128); + if (ret <= 0 || ret != 128) { + dd_dev_info(ppd->dd, "%s: failed\n", __func__); + goto bail; + } + } else if ((cache[195] & 0x40) == 0x40) { + /* only page 1 and 3 */ + ret = qsfp_read(ppd, target, 384, cache + 256, 128); + if (ret <= 0 || ret != 128) { + dd_dev_info(ppd->dd, "%s: failed\n", __func__); + goto bail; + } + ret = qsfp_read(ppd, target, 896, cache + 512, 128); + if (ret <= 0 || ret != 128) { + dd_dev_info(ppd->dd, "%s: failed\n", __func__); + goto bail; + } + } else { + /* only page 3 */ + ret = qsfp_read(ppd, target, 896, cache + 512, 128); + if (ret <= 0 || ret != 128) { + dd_dev_info(ppd->dd, "%s: failed\n", __func__); + goto bail; + } + } + } + + spin_lock_irqsave(&ppd->qsfp_info.qsfp_lock, flags); + ppd->qsfp_info.cache_valid = 1; + ppd->qsfp_info.cache_refresh_required = 0; + spin_unlock_irqrestore(&ppd->qsfp_info.qsfp_lock, flags); + + return 0; + +bail: + memset(cache, 0, (QSFP_MAX_NUM_PAGES*128)); + return ret; +} + +const char * const hfi1_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 qsfp_mod_present(struct hfi1_pportdata *ppd) +{ + if (HFI1_CAP_IS_KSET(QSFP_ENABLED)) { + struct hfi1_devdata *dd = ppd->dd; + u64 reg; + + reg = read_csr(dd, + dd->hfi1_id ? ASIC_QSFP2_IN : ASIC_QSFP1_IN); + return !(reg & QSFP_HFI0_MODPRST_N); + } + /* always return cable present */ + return 1; +} + +/* + * This function maps QSFP memory addresses in 128 byte chunks in the following + * fashion per the CableInfo SMA query definition in the IBA 1.3 spec/OPA Gen 1 + * spec + * For addr 000-127, lower page 00h + * For addr 128-255, upper page 00h + * For addr 256-383, upper page 01h + * For addr 384-511, upper page 02h + * For addr 512-639, upper page 03h + * + * For addresses beyond this range, it returns the invalid range of data buffer + * set to 0. + * For upper pages that are optional, if they are not valid, returns the + * particular range of bytes in the data buffer set to 0. + */ +int get_cable_info(struct hfi1_devdata *dd, u32 port_num, u32 addr, u32 len, + u8 *data) +{ + struct hfi1_pportdata *ppd; + u32 excess_len = 0; + int ret = 0; + + if (port_num > dd->num_pports || port_num < 1) { + dd_dev_info(dd, "%s: Invalid port number %d\n", + __func__, port_num); + ret = -EINVAL; + goto set_zeroes; + } + + ppd = dd->pport + (port_num - 1); + if (!qsfp_mod_present(ppd)) { + ret = -ENODEV; + goto set_zeroes; + } + + if (!ppd->qsfp_info.cache_valid) { + ret = -EINVAL; + goto set_zeroes; + } + + if (addr >= (QSFP_MAX_NUM_PAGES * 128)) { + ret = -ERANGE; + goto set_zeroes; + } + + if ((addr + len) > (QSFP_MAX_NUM_PAGES * 128)) { + excess_len = (addr + len) - (QSFP_MAX_NUM_PAGES * 128); + memcpy(data, &ppd->qsfp_info.cache[addr], (len - excess_len)); + data += (len - excess_len); + goto set_zeroes; + } + + memcpy(data, &ppd->qsfp_info.cache[addr], len); + return 0; + +set_zeroes: + memset(data, 0, excess_len); + return ret; +} + +int qsfp_dump(struct hfi1_pportdata *ppd, char *buf, int len) +{ + u8 *cache = &ppd->qsfp_info.cache[0]; + u8 bin_buff[QSFP_DUMP_CHUNK]; + char lenstr[6]; + int sofar, ret; + int bidx = 0; + u8 *atten = &cache[QSFP_ATTEN_OFFS]; + u8 *vendor_oui = &cache[QSFP_VOUI_OFFS]; + + sofar = 0; + lenstr[0] = ' '; + lenstr[1] = '\0'; + + if (ppd->qsfp_info.cache_valid) { + + if (QSFP_IS_CU(cache[QSFP_MOD_TECH_OFFS])) + sprintf(lenstr, "%dM ", cache[QSFP_MOD_LEN_OFFS]); + + sofar += scnprintf(buf + sofar, len - sofar, "PWR:%.3sW\n", + pwr_codes + + (QSFP_PWR(cache[QSFP_MOD_PWR_OFFS]) * 4)); + + sofar += scnprintf(buf + sofar, len - sofar, "TECH:%s%s\n", + lenstr, + hfi1_qsfp_devtech[(cache[QSFP_MOD_TECH_OFFS]) >> 4]); + + sofar += scnprintf(buf + sofar, len - sofar, "Vendor:%.*s\n", + QSFP_VEND_LEN, &cache[QSFP_VEND_OFFS]); + + sofar += scnprintf(buf + sofar, len - sofar, "OUI:%06X\n", + QSFP_OUI(vendor_oui)); + + sofar += scnprintf(buf + sofar, len - sofar, "Part#:%.*s\n", + QSFP_PN_LEN, &cache[QSFP_PN_OFFS]); + + sofar += scnprintf(buf + sofar, len - sofar, "Rev:%.*s\n", + QSFP_REV_LEN, &cache[QSFP_REV_OFFS]); + + if (QSFP_IS_CU(cache[QSFP_MOD_TECH_OFFS])) + sofar += scnprintf(buf + sofar, len - sofar, + "Atten:%d, %d\n", + QSFP_ATTEN_SDR(atten), + QSFP_ATTEN_DDR(atten)); + + sofar += scnprintf(buf + sofar, len - sofar, "Serial:%.*s\n", + QSFP_SN_LEN, &cache[QSFP_SN_OFFS]); + + sofar += scnprintf(buf + sofar, len - sofar, "Date:%.*s\n", + QSFP_DATE_LEN, &cache[QSFP_DATE_OFFS]); + + sofar += scnprintf(buf + sofar, len - sofar, "Lot:%.*s\n", + QSFP_LOT_LEN, &cache[QSFP_LOT_OFFS]); + + while (bidx < QSFP_DEFAULT_HDR_CNT) { + int iidx; + + memcpy(bin_buff, &cache[bidx], QSFP_DUMP_CHUNK); + for (iidx = 0; iidx < QSFP_DUMP_CHUNK; ++iidx) { + sofar += scnprintf(buf + sofar, len-sofar, + " %02X", bin_buff[iidx]); + } + sofar += scnprintf(buf + sofar, len - sofar, "\n"); + bidx += QSFP_DUMP_CHUNK; + } + } + ret = sofar; + return ret; +} |