diff options
Diffstat (limited to 'drivers/net/ethernet/amd/xgbe/xgbe-ptp.c')
| -rw-r--r-- | drivers/net/ethernet/amd/xgbe/xgbe-ptp.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-ptp.c b/drivers/net/ethernet/amd/xgbe/xgbe-ptp.c new file mode 100644 index 000000000000..37e64cfa5718 --- /dev/null +++ b/drivers/net/ethernet/amd/xgbe/xgbe-ptp.c @@ -0,0 +1,285 @@ +/* + * AMD 10Gb Ethernet driver + * + * This file is available to you under your choice of the following two + * licenses: + * + * License 1: GPLv2 + * + * Copyright (c) 2014 Advanced Micro Devices, Inc. + * + * This file is free software; you may copy, redistribute and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or (at + * your option) any later version. + * + * This file 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * This file incorporates work covered by the following copyright and + * permission notice: + * The Synopsys DWC ETHER XGMAC Software Driver and documentation + * (hereinafter "Software") is an unsupported proprietary work of Synopsys, + * Inc. unless otherwise expressly agreed to in writing between Synopsys + * and you. + * + * The Software IS NOT an item of Licensed Software or Licensed Product + * under any End User Software License Agreement or Agreement for Licensed + * Product with Synopsys or any supplement thereto. Permission is hereby + * granted, free of charge, to any person obtaining a copy of this software + * annotated with this license and the Software, to deal in the Software + * without restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or sell copies + * of the Software, and to permit persons to whom the Software is furnished + * to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS" + * BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS + * 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. + * + * + * License 2: Modified BSD + * + * Copyright (c) 2014 Advanced Micro Devices, Inc. + * All rights reserved. + * + * 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 Advanced Micro Devices, Inc. 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 <COPYRIGHT HOLDER> 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. + * + * This file incorporates work covered by the following copyright and + * permission notice: + * The Synopsys DWC ETHER XGMAC Software Driver and documentation + * (hereinafter "Software") is an unsupported proprietary work of Synopsys, + * Inc. unless otherwise expressly agreed to in writing between Synopsys + * and you. + * + * The Software IS NOT an item of Licensed Software or Licensed Product + * under any End User Software License Agreement or Agreement for Licensed + * Product with Synopsys or any supplement thereto. Permission is hereby + * granted, free of charge, to any person obtaining a copy of this software + * annotated with this license and the Software, to deal in the Software + * without restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or sell copies + * of the Software, and to permit persons to whom the Software is furnished + * to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS" + * BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS + * 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/clk.h> +#include <linux/clocksource.h> +#include <linux/ptp_clock_kernel.h> +#include <linux/net_tstamp.h> + +#include "xgbe.h" +#include "xgbe-common.h" + + +static cycle_t xgbe_cc_read(const struct cyclecounter *cc) +{ + struct xgbe_prv_data *pdata = container_of(cc, + struct xgbe_prv_data, + tstamp_cc); + u64 nsec; + + nsec = pdata->hw_if.get_tstamp_time(pdata); + + return nsec; +} + +static int xgbe_adjfreq(struct ptp_clock_info *info, s32 delta) +{ + struct xgbe_prv_data *pdata = container_of(info, + struct xgbe_prv_data, + ptp_clock_info); + unsigned long flags; + u64 adjust; + u32 addend, diff; + unsigned int neg_adjust = 0; + + if (delta < 0) { + neg_adjust = 1; + delta = -delta; + } + + adjust = pdata->tstamp_addend; + adjust *= delta; + diff = div_u64(adjust, 1000000000UL); + + addend = (neg_adjust) ? pdata->tstamp_addend - diff : + pdata->tstamp_addend + diff; + + spin_lock_irqsave(&pdata->tstamp_lock, flags); + + pdata->hw_if.update_tstamp_addend(pdata, addend); + + spin_unlock_irqrestore(&pdata->tstamp_lock, flags); + + return 0; +} + +static int xgbe_adjtime(struct ptp_clock_info *info, s64 delta) +{ + struct xgbe_prv_data *pdata = container_of(info, + struct xgbe_prv_data, + ptp_clock_info); + unsigned long flags; + u64 nsec; + + spin_lock_irqsave(&pdata->tstamp_lock, flags); + + nsec = timecounter_read(&pdata->tstamp_tc); + + nsec += delta; + timecounter_init(&pdata->tstamp_tc, &pdata->tstamp_cc, nsec); + + spin_unlock_irqrestore(&pdata->tstamp_lock, flags); + + return 0; +} + +static int xgbe_gettime(struct ptp_clock_info *info, struct timespec *ts) +{ + struct xgbe_prv_data *pdata = container_of(info, + struct xgbe_prv_data, + ptp_clock_info); + unsigned long flags; + u64 nsec; + + spin_lock_irqsave(&pdata->tstamp_lock, flags); + + nsec = timecounter_read(&pdata->tstamp_tc); + + spin_unlock_irqrestore(&pdata->tstamp_lock, flags); + + *ts = ns_to_timespec(nsec); + + return 0; +} + +static int xgbe_settime(struct ptp_clock_info *info, const struct timespec *ts) +{ + struct xgbe_prv_data *pdata = container_of(info, + struct xgbe_prv_data, + ptp_clock_info); + unsigned long flags; + u64 nsec; + + nsec = timespec_to_ns(ts); + + spin_lock_irqsave(&pdata->tstamp_lock, flags); + + timecounter_init(&pdata->tstamp_tc, &pdata->tstamp_cc, nsec); + + spin_unlock_irqrestore(&pdata->tstamp_lock, flags); + + return 0; +} + +static int xgbe_enable(struct ptp_clock_info *info, + struct ptp_clock_request *request, int on) +{ + return -EOPNOTSUPP; +} + +void xgbe_ptp_register(struct xgbe_prv_data *pdata) +{ + struct ptp_clock_info *info = &pdata->ptp_clock_info; + struct ptp_clock *clock; + struct cyclecounter *cc = &pdata->tstamp_cc; + u64 dividend; + + snprintf(info->name, sizeof(info->name), "%s", + netdev_name(pdata->netdev)); + info->owner = THIS_MODULE; + info->max_adj = clk_get_rate(pdata->ptpclk); + info->adjfreq = xgbe_adjfreq; + info->adjtime = xgbe_adjtime; + info->gettime = xgbe_gettime; + info->settime = xgbe_settime; + info->enable = xgbe_enable; + + clock = ptp_clock_register(info, pdata->dev); + if (IS_ERR(clock)) { + dev_err(pdata->dev, "ptp_clock_register failed\n"); + return; + } + + pdata->ptp_clock = clock; + + /* Calculate the addend: + * addend = 2^32 / (PTP ref clock / 50Mhz) + * = (2^32 * 50Mhz) / PTP ref clock + */ + dividend = 50000000; + dividend <<= 32; + pdata->tstamp_addend = div_u64(dividend, clk_get_rate(pdata->ptpclk)); + + /* Setup the timecounter */ + cc->read = xgbe_cc_read; + cc->mask = CLOCKSOURCE_MASK(64); + cc->mult = 1; + cc->shift = 0; + + timecounter_init(&pdata->tstamp_tc, &pdata->tstamp_cc, + ktime_to_ns(ktime_get_real())); + + /* Disable all timestamping to start */ + XGMAC_IOWRITE(pdata, MAC_TCR, 0); + pdata->tstamp_config.tx_type = HWTSTAMP_TX_OFF; + pdata->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE; +} + +void xgbe_ptp_unregister(struct xgbe_prv_data *pdata) +{ + if (pdata->ptp_clock) + ptp_clock_unregister(pdata->ptp_clock); +} |