From patchwork Wed Jan 4 08:43:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arun Ramadoss X-Patchwork-Id: 13088284 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 69151C4332F for ; Wed, 4 Jan 2023 08:44:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234229AbjADIob (ORCPT ); Wed, 4 Jan 2023 03:44:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234316AbjADIoY (ORCPT ); Wed, 4 Jan 2023 03:44:24 -0500 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3CD9D18B08; Wed, 4 Jan 2023 00:44:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1672821864; x=1704357864; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ftNYr345wKXL1i5jF5hNXFD5pxj+/oubdNgXUD4GyiU=; b=DWgpRHabklTCyxUsHQNKMbOUFO6Hm3IOGxAstsq/vz5O29rUiTfdQGGL 3nlgtEsJJZhPPfTFXv+z1A6TZar9g/QBEq5+I/EKFReeY/HnlK9ax1gJP aIxqGQpLXrA1dco4XggZuecO51OxY1Byctmryie5C2fvz49/+dSEBlYNW LGe0LgtuY9OGz8G95CGkzaEBTtsMGT5HoOWhvPaUjNDIAlp6RDeDSltKX 8BqP3Ia1RI7capseI+FyUVtW7h7vuIT1IjWJM2KNYmryPU3mbyGp/qbeM y1CXZvhWtGSrqkEMPZlKAyW9IIWPZpCDe4L8IT7r3v79tEymtDH8l6PZ9 Q==; X-IronPort-AV: E=Sophos;i="5.96,299,1665471600"; d="scan'208";a="190656775" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa4.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 04 Jan 2023 01:44:23 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Wed, 4 Jan 2023 01:44:19 -0700 Received: from CHE-LT-I17769U.microchip.com (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Wed, 4 Jan 2023 01:44:13 -0700 From: Arun Ramadoss To: , CC: , , , , , , , , , , , , , Subject: [Patch net-next v7 01/13] net: dsa: microchip: ptp: add the posix clock support Date: Wed, 4 Jan 2023 14:13:04 +0530 Message-ID: <20230104084316.4281-2-arun.ramadoss@microchip.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20230104084316.4281-1-arun.ramadoss@microchip.com> References: <20230104084316.4281-1-arun.ramadoss@microchip.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Christian Eggers This patch implement routines (adjfine, adjtime, gettime and settime) for manipulating the chip's PTP clock. It registers the ptp caps to posix clock register. Signed-off-by: Christian Eggers Co-developed-by: Arun Ramadoss Signed-off-by: Arun Ramadoss Reviewed-by: Vladimir Oltean # mostly api Reviewed-by: Florian Fainelli Reviewed-by: Jacob Keller --- v4 -> v5 - Used the diff_by_scaled_ppm helper function in adjfine v2 -> v3 - Reverted back to setting 802_1as bit. - Also set the p2p bit which is required for the updating correction field. v1 -> v2 - added arri in copyright message - Deleted setting 8021_1as bit and added P2P bit in ksz_ptp_clock_register() - Renamed error_return label to unlock - Assigned the ptp_clock_info directly instead of const struct - moved the semicolon in ksz_rmw16 after 0x%x: - moved ts_info to next patch RFC v2 -> Patch v1 - Repharsed the Kconfig help text - Removed IS_ERR_OR_NULL check in ptp_clock_unregister - Add the check for ptp_data->clock in ksz_ptp_ts_info - Renamed MAX_DRIFT_CORR to KSZ_MAX_DRIFT_CORR - Removed the comments - Variables declaration in reverse christmas tree - Added the ptp_clock_optional --- drivers/net/dsa/microchip/Kconfig | 11 ++ drivers/net/dsa/microchip/Makefile | 5 + drivers/net/dsa/microchip/ksz_common.c | 13 +- drivers/net/dsa/microchip/ksz_common.h | 16 ++ drivers/net/dsa/microchip/ksz_ptp.c | 236 ++++++++++++++++++++++++ drivers/net/dsa/microchip/ksz_ptp.h | 42 +++++ drivers/net/dsa/microchip/ksz_ptp_reg.h | 52 ++++++ 7 files changed, 374 insertions(+), 1 deletion(-) create mode 100644 drivers/net/dsa/microchip/ksz_ptp.c create mode 100644 drivers/net/dsa/microchip/ksz_ptp.h create mode 100644 drivers/net/dsa/microchip/ksz_ptp_reg.h diff --git a/drivers/net/dsa/microchip/Kconfig b/drivers/net/dsa/microchip/Kconfig index 913f83ef013c..0546c573668a 100644 --- a/drivers/net/dsa/microchip/Kconfig +++ b/drivers/net/dsa/microchip/Kconfig @@ -11,6 +11,7 @@ menuconfig NET_DSA_MICROCHIP_KSZ_COMMON config NET_DSA_MICROCHIP_KSZ9477_I2C tristate "KSZ series I2C connected switch driver" depends on NET_DSA_MICROCHIP_KSZ_COMMON && I2C + depends on PTP_1588_CLOCK_OPTIONAL select REGMAP_I2C help Select to enable support for registering switches configured through I2C. @@ -18,10 +19,20 @@ config NET_DSA_MICROCHIP_KSZ9477_I2C config NET_DSA_MICROCHIP_KSZ_SPI tristate "KSZ series SPI connected switch driver" depends on NET_DSA_MICROCHIP_KSZ_COMMON && SPI + depends on PTP_1588_CLOCK_OPTIONAL select REGMAP_SPI help Select to enable support for registering switches configured through SPI. +config NET_DSA_MICROCHIP_KSZ_PTP + bool "Support for the PTP clock on the KSZ9563/LAN937x Ethernet Switch" + depends on NET_DSA_MICROCHIP_KSZ_COMMON && PTP_1588_CLOCK + help + Select to enable support for timestamping & PTP clock manipulation in + KSZ8563/KSZ9563/LAN937x series of switches. KSZ9563/KSZ8563 supports + only one step timestamping. LAN937x switch supports both one step and + two step timestamping. + config NET_DSA_MICROCHIP_KSZ8863_SMI tristate "KSZ series SMI connected switch driver" depends on NET_DSA_MICROCHIP_KSZ_COMMON diff --git a/drivers/net/dsa/microchip/Makefile b/drivers/net/dsa/microchip/Makefile index 28873559efc2..48360cc9fc68 100644 --- a/drivers/net/dsa/microchip/Makefile +++ b/drivers/net/dsa/microchip/Makefile @@ -4,6 +4,11 @@ ksz_switch-objs := ksz_common.o ksz_switch-objs += ksz9477.o ksz_switch-objs += ksz8795.o ksz_switch-objs += lan937x_main.o + +ifdef CONFIG_NET_DSA_MICROCHIP_KSZ_PTP +ksz_switch-objs += ksz_ptp.o +endif + obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ9477_I2C) += ksz9477_i2c.o obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ_SPI) += ksz_spi.o obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ8863_SMI) += ksz8863_smi.o diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c index 9b20c2ee6d62..3e2ebadeade9 100644 --- a/drivers/net/dsa/microchip/ksz_common.c +++ b/drivers/net/dsa/microchip/ksz_common.c @@ -25,6 +25,7 @@ #include #include "ksz_common.h" +#include "ksz_ptp.h" #include "ksz8.h" #include "ksz9477.h" #include "lan937x.h" @@ -2102,10 +2103,16 @@ static int ksz_setup(struct dsa_switch *ds) } } + ret = ksz_ptp_clock_register(ds); + if (ret) { + dev_err(dev->dev, "Failed to register PTP clock: %d\n", ret); + goto out_pirq; + } + ret = ksz_mdio_register(dev); if (ret < 0) { dev_err(dev->dev, "failed to register the mdio"); - goto out_pirq; + goto out_ptp_clock_unregister; } /* start switch */ @@ -2114,6 +2121,8 @@ static int ksz_setup(struct dsa_switch *ds) return 0; +out_ptp_clock_unregister: + ksz_ptp_clock_unregister(ds); out_pirq: if (dev->irq > 0) dsa_switch_for_each_user_port(dp, dev->ds) @@ -2130,6 +2139,8 @@ static void ksz_teardown(struct dsa_switch *ds) struct ksz_device *dev = ds->priv; struct dsa_port *dp; + ksz_ptp_clock_unregister(ds); + if (dev->irq > 0) { dsa_switch_for_each_user_port(dp, dev->ds) ksz_irq_free(&dev->ports[dp->index].pirq); diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h index 055d61ff3fb8..23ed7fa72a3c 100644 --- a/drivers/net/dsa/microchip/ksz_common.h +++ b/drivers/net/dsa/microchip/ksz_common.h @@ -15,6 +15,8 @@ #include #include +#include "ksz_ptp.h" + #define KSZ_MAX_NUM_PORTS 8 struct ksz_device; @@ -140,6 +142,7 @@ struct ksz_device { u16 port_mask; struct mutex lock_irq; /* IRQ Access */ struct ksz_irq girq; + struct ksz_ptp_data ptp_data; }; /* List of supported models */ @@ -443,6 +446,19 @@ static inline int ksz_write32(struct ksz_device *dev, u32 reg, u32 value) return ret; } +static inline int ksz_rmw16(struct ksz_device *dev, u32 reg, u16 mask, + u16 value) +{ + int ret; + + ret = regmap_update_bits(dev->regmap[1], reg, mask, value); + if (ret) + dev_err(dev->dev, "can't rmw 16bit reg 0x%x: %pe\n", reg, + ERR_PTR(ret)); + + return ret; +} + static inline int ksz_write64(struct ksz_device *dev, u32 reg, u64 value) { u32 val[2]; diff --git a/drivers/net/dsa/microchip/ksz_ptp.c b/drivers/net/dsa/microchip/ksz_ptp.c new file mode 100644 index 000000000000..fb1efb60ef71 --- /dev/null +++ b/drivers/net/dsa/microchip/ksz_ptp.c @@ -0,0 +1,236 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Microchip KSZ PTP Implementation + * + * Copyright (C) 2020 ARRI Lighting + * Copyright (C) 2022 Microchip Technology Inc. + */ + +#include +#include +#include + +#include "ksz_common.h" +#include "ksz_ptp.h" +#include "ksz_ptp_reg.h" + +#define ptp_caps_to_data(d) container_of((d), struct ksz_ptp_data, caps) +#define ptp_data_to_ksz_dev(d) container_of((d), struct ksz_device, ptp_data) + +/* Sub-nanoseconds-adj,max * sub-nanoseconds / 40ns * 1ns + * = (2^30-1) * (2 ^ 32) / 40 ns * 1 ns = 6249999 + */ +#define KSZ_MAX_DRIFT_CORR 6249999 + +#define KSZ_PTP_INC_NS 40ULL /* HW clock is incremented every 40 ns (by 40) */ +#define KSZ_PTP_SUBNS_BITS 32 + +static int _ksz_ptp_gettime(struct ksz_device *dev, struct timespec64 *ts) +{ + u32 nanoseconds; + u32 seconds; + u8 phase; + int ret; + + /* Copy current PTP clock into shadow registers and read */ + ret = ksz_rmw16(dev, REG_PTP_CLK_CTRL, PTP_READ_TIME, PTP_READ_TIME); + if (ret) + return ret; + + ret = ksz_read8(dev, REG_PTP_RTC_SUB_NANOSEC__2, &phase); + if (ret) + return ret; + + ret = ksz_read32(dev, REG_PTP_RTC_NANOSEC, &nanoseconds); + if (ret) + return ret; + + ret = ksz_read32(dev, REG_PTP_RTC_SEC, &seconds); + if (ret) + return ret; + + ts->tv_sec = seconds; + ts->tv_nsec = nanoseconds + phase * 8; + + return 0; +} + +static int ksz_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts) +{ + struct ksz_ptp_data *ptp_data = ptp_caps_to_data(ptp); + struct ksz_device *dev = ptp_data_to_ksz_dev(ptp_data); + int ret; + + mutex_lock(&ptp_data->lock); + ret = _ksz_ptp_gettime(dev, ts); + mutex_unlock(&ptp_data->lock); + + return ret; +} + +static int ksz_ptp_settime(struct ptp_clock_info *ptp, + const struct timespec64 *ts) +{ + struct ksz_ptp_data *ptp_data = ptp_caps_to_data(ptp); + struct ksz_device *dev = ptp_data_to_ksz_dev(ptp_data); + int ret; + + mutex_lock(&ptp_data->lock); + + /* Write to shadow registers and Load PTP clock */ + ret = ksz_write16(dev, REG_PTP_RTC_SUB_NANOSEC__2, PTP_RTC_0NS); + if (ret) + goto unlock; + + ret = ksz_write32(dev, REG_PTP_RTC_NANOSEC, ts->tv_nsec); + if (ret) + goto unlock; + + ret = ksz_write32(dev, REG_PTP_RTC_SEC, ts->tv_sec); + if (ret) + goto unlock; + + ret = ksz_rmw16(dev, REG_PTP_CLK_CTRL, PTP_LOAD_TIME, PTP_LOAD_TIME); + +unlock: + mutex_unlock(&ptp_data->lock); + + return ret; +} + +static int ksz_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) +{ + struct ksz_ptp_data *ptp_data = ptp_caps_to_data(ptp); + struct ksz_device *dev = ptp_data_to_ksz_dev(ptp_data); + u64 base, adj; + bool negative; + u32 data32; + int ret; + + mutex_lock(&ptp_data->lock); + + if (scaled_ppm) { + base = KSZ_PTP_INC_NS << KSZ_PTP_SUBNS_BITS; + negative = diff_by_scaled_ppm(base, scaled_ppm, &adj); + + data32 = (u32)adj; + data32 &= PTP_SUBNANOSEC_M; + if (!negative) + data32 |= PTP_RATE_DIR; + + ret = ksz_write32(dev, REG_PTP_SUBNANOSEC_RATE, data32); + if (ret) + goto unlock; + + ret = ksz_rmw16(dev, REG_PTP_CLK_CTRL, PTP_CLK_ADJ_ENABLE, + PTP_CLK_ADJ_ENABLE); + if (ret) + goto unlock; + } else { + ret = ksz_rmw16(dev, REG_PTP_CLK_CTRL, PTP_CLK_ADJ_ENABLE, 0); + if (ret) + goto unlock; + } + +unlock: + mutex_unlock(&ptp_data->lock); + return ret; +} + +static int ksz_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) +{ + struct ksz_ptp_data *ptp_data = ptp_caps_to_data(ptp); + struct ksz_device *dev = ptp_data_to_ksz_dev(ptp_data); + s32 sec, nsec; + u16 data16; + int ret; + + mutex_lock(&ptp_data->lock); + + /* do not use ns_to_timespec64(), + * both sec and nsec are subtracted by hw + */ + sec = div_s64_rem(delta, NSEC_PER_SEC, &nsec); + + ret = ksz_write32(dev, REG_PTP_RTC_NANOSEC, abs(nsec)); + if (ret) + goto unlock; + + ret = ksz_write32(dev, REG_PTP_RTC_SEC, abs(sec)); + if (ret) + goto unlock; + + ret = ksz_read16(dev, REG_PTP_CLK_CTRL, &data16); + if (ret) + goto unlock; + + data16 |= PTP_STEP_ADJ; + + /* PTP_STEP_DIR -- 0: subtract, 1: add */ + if (delta < 0) + data16 &= ~PTP_STEP_DIR; + else + data16 |= PTP_STEP_DIR; + + ret = ksz_write16(dev, REG_PTP_CLK_CTRL, data16); + +unlock: + mutex_unlock(&ptp_data->lock); + return ret; +} + +static int ksz_ptp_start_clock(struct ksz_device *dev) +{ + return ksz_rmw16(dev, REG_PTP_CLK_CTRL, PTP_CLK_ENABLE, PTP_CLK_ENABLE); +} + +int ksz_ptp_clock_register(struct dsa_switch *ds) +{ + struct ksz_device *dev = ds->priv; + struct ksz_ptp_data *ptp_data; + int ret; + + ptp_data = &dev->ptp_data; + mutex_init(&ptp_data->lock); + + ptp_data->caps.owner = THIS_MODULE; + snprintf(ptp_data->caps.name, 16, "Microchip Clock"); + ptp_data->caps.max_adj = KSZ_MAX_DRIFT_CORR; + ptp_data->caps.gettime64 = ksz_ptp_gettime; + ptp_data->caps.settime64 = ksz_ptp_settime; + ptp_data->caps.adjfine = ksz_ptp_adjfine; + ptp_data->caps.adjtime = ksz_ptp_adjtime; + + ret = ksz_ptp_start_clock(dev); + if (ret) + return ret; + + /* Currently only P2P mode is supported. When 802_1AS bit is set, it + * forwards all PTP packets to host port and none to other ports. + */ + ret = ksz_rmw16(dev, REG_PTP_MSG_CONF1, PTP_TC_P2P | PTP_802_1AS, + PTP_TC_P2P | PTP_802_1AS); + if (ret) + return ret; + + ptp_data->clock = ptp_clock_register(&ptp_data->caps, dev->dev); + if (IS_ERR_OR_NULL(ptp_data->clock)) + return PTR_ERR(ptp_data->clock); + + return 0; +} + +void ksz_ptp_clock_unregister(struct dsa_switch *ds) +{ + struct ksz_device *dev = ds->priv; + struct ksz_ptp_data *ptp_data; + + ptp_data = &dev->ptp_data; + + if (ptp_data->clock) + ptp_clock_unregister(ptp_data->clock); +} + +MODULE_AUTHOR("Christian Eggers "); +MODULE_AUTHOR("Arun Ramadoss "); +MODULE_DESCRIPTION("PTP support for KSZ switch"); +MODULE_LICENSE("GPL"); diff --git a/drivers/net/dsa/microchip/ksz_ptp.h b/drivers/net/dsa/microchip/ksz_ptp.h new file mode 100644 index 000000000000..8930047da764 --- /dev/null +++ b/drivers/net/dsa/microchip/ksz_ptp.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Microchip KSZ PTP Implementation + * + * Copyright (C) 2020 ARRI Lighting + * Copyright (C) 2022 Microchip Technology Inc. + */ + +#ifndef _NET_DSA_DRIVERS_KSZ_PTP_H +#define _NET_DSA_DRIVERS_KSZ_PTP_H + +#if IS_ENABLED(CONFIG_NET_DSA_MICROCHIP_KSZ_PTP) + +#include + +struct ksz_ptp_data { + struct ptp_clock_info caps; + struct ptp_clock *clock; + /* Serializes all operations on the PTP hardware clock */ + struct mutex lock; +}; + +int ksz_ptp_clock_register(struct dsa_switch *ds); + +void ksz_ptp_clock_unregister(struct dsa_switch *ds); + +#else + +struct ksz_ptp_data { + /* Serializes all operations on the PTP hardware clock */ + struct mutex lock; +}; + +static inline int ksz_ptp_clock_register(struct dsa_switch *ds) +{ + return 0; +} + +static inline void ksz_ptp_clock_unregister(struct dsa_switch *ds) { } + +#endif /* End of CONFIG_NET_DSA_MICROCHIP_KSZ_PTP */ + +#endif diff --git a/drivers/net/dsa/microchip/ksz_ptp_reg.h b/drivers/net/dsa/microchip/ksz_ptp_reg.h new file mode 100644 index 000000000000..4ca4ad4bba7e --- /dev/null +++ b/drivers/net/dsa/microchip/ksz_ptp_reg.h @@ -0,0 +1,52 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Microchip KSZ PTP register definitions + * Copyright (C) 2022 Microchip Technology Inc. + */ + +#ifndef __KSZ_PTP_REGS_H +#define __KSZ_PTP_REGS_H + +/* 5 - PTP Clock */ +#define REG_PTP_CLK_CTRL 0x0500 + +#define PTP_STEP_ADJ BIT(6) +#define PTP_STEP_DIR BIT(5) +#define PTP_READ_TIME BIT(4) +#define PTP_LOAD_TIME BIT(3) +#define PTP_CLK_ADJ_ENABLE BIT(2) +#define PTP_CLK_ENABLE BIT(1) +#define PTP_CLK_RESET BIT(0) + +#define REG_PTP_RTC_SUB_NANOSEC__2 0x0502 + +#define PTP_RTC_SUB_NANOSEC_M 0x0007 +#define PTP_RTC_0NS 0x00 + +#define REG_PTP_RTC_NANOSEC 0x0504 + +#define REG_PTP_RTC_SEC 0x0508 + +#define REG_PTP_SUBNANOSEC_RATE 0x050C + +#define PTP_SUBNANOSEC_M 0x3FFFFFFF +#define PTP_RATE_DIR BIT(31) +#define PTP_TMP_RATE_ENABLE BIT(30) + +#define REG_PTP_SUBNANOSEC_RATE_L 0x050E + +#define REG_PTP_RATE_DURATION 0x0510 +#define REG_PTP_RATE_DURATION_H 0x0510 +#define REG_PTP_RATE_DURATION_L 0x0512 + +#define REG_PTP_MSG_CONF1 0x0514 + +#define PTP_802_1AS BIT(7) +#define PTP_ENABLE BIT(6) +#define PTP_ETH_ENABLE BIT(5) +#define PTP_IPV4_UDP_ENABLE BIT(4) +#define PTP_IPV6_UDP_ENABLE BIT(3) +#define PTP_TC_P2P BIT(2) +#define PTP_MASTER BIT(1) +#define PTP_1STEP BIT(0) + +#endif