From patchwork Wed Dec 21 09:46:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arun Ramadoss X-Patchwork-Id: 13078589 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 B6E09C4332F for ; Wed, 21 Dec 2022 09:49:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234695AbiLUJtI (ORCPT ); Wed, 21 Dec 2022 04:49:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54730 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234702AbiLUJrt (ORCPT ); Wed, 21 Dec 2022 04:47:49 -0500 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AFF3922531; Wed, 21 Dec 2022 01:47:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1671616035; x=1703152035; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=UsHmTSYYPn1twb1CmRgwSvovOZE4YEECudvHsta4jMU=; b=GtGVHRNHai+odldmMiYV8a3DnKxBFfmLRCE09GU3570XwkK9ZtEeQ9z8 ijOz570RLpqn11gVGfreWA3YbFI+llEvkiLFruaBK+L9cCVjviTygcYEi 2Zzt1Fyah0AENDJGDFVLx1XhWrIjBMYx+Kj3uXgoCM7hNHbeNJPsocRHX PzMTM9TDqqlKO9fBkLps77+v0NSDKNo7U7mOQ4faSmFV9f6HjAOnkc2pU 0LUChQBbUwM/VCOCmDBfN5OroRKpW1VcRCQQLPmXHcXclULPp5ADJHRjr JVXJYyuhiEsAoCQ5vHH9nM+p4cgoldBTVtVv1IqZlddIwCBHuh2fq05bb w==; X-IronPort-AV: E=Sophos;i="5.96,262,1665471600"; d="scan'208";a="189133863" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa4.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 21 Dec 2022 02:47:15 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Wed, 21 Dec 2022 02:47:14 -0700 Received: from CHE-LT-I17769U.microchip.com (10.10.115.15) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Wed, 21 Dec 2022 02:47:07 -0700 From: Arun Ramadoss To: , CC: , , , , , , , , , , , , , , Subject: [RFC Patch net-next v5 05/13] net: dsa: microchip: ptp: enable interrupt for timestamping Date: Wed, 21 Dec 2022 15:16:04 +0530 Message-ID: <20221221094612.22372-6-arun.ramadoss@microchip.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20221221094612.22372-1-arun.ramadoss@microchip.com> References: <20221221094612.22372-1-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 X-Patchwork-State: RFC PTP Interrupt mask and status register differ from the global and port interrupt mechanism by two methods. One is that for global/port interrupt enabling we have to clear the bit but for ptp interrupt we have to set the bit. And other is bit12:0 is reserved in ptp interrupt registers. This forced to not use the generic implementation of global/port interrupt method routine. This patch implement the ptp interrupt mechanism to read the timestamp register for sync, pdelay_req and pdelay_resp. Signed-off-by: Arun Ramadoss --- v4 -> v5 - Replaced the irq_domain_add_simple with irq_domain_add_linear - Updated the error path to free_irq v3 -> v4 - Removed IRQF_TRIGGER_FALLING flag in the request_threaded_irq RFC v2 -> Patch v1 - Moved the acking of interrupts before calling the handle_nested_irq to avoid race condition between deferred xmit and Irq threads --- drivers/net/dsa/microchip/ksz_common.c | 15 +- drivers/net/dsa/microchip/ksz_common.h | 11 ++ drivers/net/dsa/microchip/ksz_ptp.c | 207 ++++++++++++++++++++++++ drivers/net/dsa/microchip/ksz_ptp.h | 9 ++ drivers/net/dsa/microchip/ksz_ptp_reg.h | 19 +++ 5 files changed, 259 insertions(+), 2 deletions(-) diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c index 81da650b70fb..1611f8f5cd6c 100644 --- a/drivers/net/dsa/microchip/ksz_common.c +++ b/drivers/net/dsa/microchip/ksz_common.c @@ -2101,13 +2101,17 @@ static int ksz_setup(struct dsa_switch *ds) ret = ksz_pirq_setup(dev, dp->index); if (ret) goto out_girq; + + ret = ksz_ptp_irq_setup(ds, dp->index); + if (ret) + goto out_pirq; } } ret = ksz_ptp_clock_register(ds); if (ret) { dev_err(dev->dev, "Failed to register PTP clock: %d\n", ret); - goto out_pirq; + goto out_ptpirq; } ret = ksz_mdio_register(dev); @@ -2124,6 +2128,10 @@ static int ksz_setup(struct dsa_switch *ds) out_ptp_clock_unregister: ksz_ptp_clock_unregister(ds); +out_ptpirq: + if (dev->irq > 0) + dsa_switch_for_each_user_port(dp, dev->ds) + ksz_ptp_irq_free(ds, dp->index); out_pirq: if (dev->irq > 0) dsa_switch_for_each_user_port(dp, dev->ds) @@ -2143,8 +2151,11 @@ static void ksz_teardown(struct dsa_switch *ds) ksz_ptp_clock_unregister(ds); if (dev->irq > 0) { - dsa_switch_for_each_user_port(dp, dev->ds) + dsa_switch_for_each_user_port(dp, dev->ds) { + ksz_ptp_irq_free(ds, dp->index); + ksz_irq_free(&dev->ports[dp->index].pirq); + } ksz_irq_free(&dev->girq); } diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h index 641aca78ef05..ec1bceb4efcc 100644 --- a/drivers/net/dsa/microchip/ksz_common.h +++ b/drivers/net/dsa/microchip/ksz_common.h @@ -20,6 +20,7 @@ #define KSZ_MAX_NUM_PORTS 8 struct ksz_device; +struct ksz_port; struct vlan_table { u32 table[3]; @@ -83,6 +84,13 @@ struct ksz_irq { struct ksz_device *dev; }; +struct ksz_ptp_irq { + struct ksz_port *port; + u16 ts_reg; + char name[16]; + int num; +}; + struct ksz_port { bool remove_tag; /* Remove Tag flag set, for ksz8795 only */ bool learning; @@ -106,6 +114,8 @@ struct ksz_port { struct hwtstamp_config tstamp_config; bool hwts_tx_en; bool hwts_rx_en; + struct ksz_irq ptpirq; + struct ksz_ptp_irq ptpmsg_irq[3]; #endif }; @@ -612,6 +622,7 @@ static inline int is_lan937x(struct ksz_device *dev) #define REG_PORT_INT_MASK 0x001F #define PORT_SRC_PHY_INT 1 +#define PORT_SRC_PTP_INT 2 #define KSZ8795_HUGE_PACKET_SIZE 2000 #define KSZ8863_HUGE_PACKET_SIZE 1916 diff --git a/drivers/net/dsa/microchip/ksz_ptp.c b/drivers/net/dsa/microchip/ksz_ptp.c index 16f172c1f5c2..03127b46abea 100644 --- a/drivers/net/dsa/microchip/ksz_ptp.c +++ b/drivers/net/dsa/microchip/ksz_ptp.c @@ -6,6 +6,8 @@ */ #include +#include +#include #include #include #include @@ -25,6 +27,8 @@ #define KSZ_PTP_INC_NS 40ULL /* HW clock is incremented every 40 ns (by 40) */ #define KSZ_PTP_SUBNS_BITS 32 +#define KSZ_PTP_INT_START 13 + static int ksz_ptp_enable_mode(struct ksz_device *dev) { struct ksz_tagger_data *tagger_data = ksz_tagger_data(dev->ds); @@ -411,6 +415,209 @@ void ksz_ptp_clock_unregister(struct dsa_switch *ds) ptp_clock_unregister(ptp_data->clock); } +static irqreturn_t ksz_ptp_msg_thread_fn(int irq, void *dev_id) +{ + return IRQ_NONE; +} + +static irqreturn_t ksz_ptp_irq_thread_fn(int irq, void *dev_id) +{ + struct ksz_irq *ptpirq = dev_id; + unsigned int nhandled = 0; + struct ksz_device *dev; + unsigned int sub_irq; + u16 data; + int ret; + u8 n; + + dev = ptpirq->dev; + + ret = ksz_read16(dev, ptpirq->reg_status, &data); + if (ret) + goto out; + + /* Clear the interrupts W1C */ + ret = ksz_write16(dev, ptpirq->reg_status, data); + if (ret) + return IRQ_NONE; + + for (n = 0; n < ptpirq->nirqs; ++n) { + if (data & BIT(n + KSZ_PTP_INT_START)) { + sub_irq = irq_find_mapping(ptpirq->domain, n); + handle_nested_irq(sub_irq); + ++nhandled; + } + } + +out: + return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE); +} + +static void ksz_ptp_irq_mask(struct irq_data *d) +{ + struct ksz_irq *kirq = irq_data_get_irq_chip_data(d); + + kirq->masked &= ~BIT(d->hwirq + KSZ_PTP_INT_START); +} + +static void ksz_ptp_irq_unmask(struct irq_data *d) +{ + struct ksz_irq *kirq = irq_data_get_irq_chip_data(d); + + kirq->masked |= BIT(d->hwirq + KSZ_PTP_INT_START); +} + +static void ksz_ptp_irq_bus_lock(struct irq_data *d) +{ + struct ksz_irq *kirq = irq_data_get_irq_chip_data(d); + + mutex_lock(&kirq->dev->lock_irq); +} + +static void ksz_ptp_irq_bus_sync_unlock(struct irq_data *d) +{ + struct ksz_irq *kirq = irq_data_get_irq_chip_data(d); + struct ksz_device *dev = kirq->dev; + int ret; + + ret = ksz_write16(dev, kirq->reg_mask, kirq->masked); + if (ret) + dev_err(dev->dev, "failed to change IRQ mask\n"); + + mutex_unlock(&dev->lock_irq); +} + +static const struct irq_chip ksz_ptp_irq_chip = { + .name = "ksz-irq", + .irq_mask = ksz_ptp_irq_mask, + .irq_unmask = ksz_ptp_irq_unmask, + .irq_bus_lock = ksz_ptp_irq_bus_lock, + .irq_bus_sync_unlock = ksz_ptp_irq_bus_sync_unlock, +}; + +static int ksz_ptp_irq_domain_map(struct irq_domain *d, + unsigned int irq, irq_hw_number_t hwirq) +{ + irq_set_chip_data(irq, d->host_data); + irq_set_chip_and_handler(irq, &ksz_ptp_irq_chip, handle_level_irq); + irq_set_noprobe(irq); + + return 0; +} + +static const struct irq_domain_ops ksz_ptp_irq_domain_ops = { + .map = ksz_ptp_irq_domain_map, + .xlate = irq_domain_xlate_twocell, +}; + +static void ksz_ptp_msg_irq_free(struct ksz_port *port, u8 n) +{ + struct ksz_ptp_irq *ptpmsg_irq; + + ptpmsg_irq = &port->ptpmsg_irq[n]; + + free_irq(ptpmsg_irq->num, ptpmsg_irq); + irq_dispose_mapping(ptpmsg_irq->num); +} + +static int ksz_ptp_msg_irq_setup(struct ksz_port *port, u8 n) +{ + u16 ts_reg[] = {REG_PTP_PORT_PDRESP_TS, REG_PTP_PORT_XDELAY_TS, + REG_PTP_PORT_SYNC_TS}; + static const char * const name[] = {"pdresp-msg", "xdreq-msg", + "sync-msg"}; + const struct ksz_dev_ops *ops = port->ksz_dev->dev_ops; + struct ksz_ptp_irq *ptpmsg_irq; + + ptpmsg_irq = &port->ptpmsg_irq[n]; + + ptpmsg_irq->port = port; + ptpmsg_irq->ts_reg = ops->get_port_addr(port->num, ts_reg[n]); + + snprintf(ptpmsg_irq->name, sizeof(ptpmsg_irq->name), name[n]); + + ptpmsg_irq->num = irq_find_mapping(port->ptpirq.domain, n); + if (ptpmsg_irq->num < 0) + return ptpmsg_irq->num; + + return request_threaded_irq(ptpmsg_irq->num, NULL, + ksz_ptp_msg_thread_fn, IRQF_ONESHOT, + ptpmsg_irq->name, ptpmsg_irq); +} + +int ksz_ptp_irq_setup(struct dsa_switch *ds, u8 p) +{ + struct ksz_device *dev = ds->priv; + const struct ksz_dev_ops *ops = dev->dev_ops; + struct ksz_port *port = &dev->ports[p]; + struct ksz_irq *ptpirq = &port->ptpirq; + int irq; + int ret; + + ptpirq->dev = dev; + ptpirq->masked = 0; + ptpirq->nirqs = 3; + ptpirq->reg_mask = ops->get_port_addr(p, REG_PTP_PORT_TX_INT_ENABLE__2); + ptpirq->reg_status = ops->get_port_addr(p, + REG_PTP_PORT_TX_INT_STATUS__2); + snprintf(ptpirq->name, sizeof(ptpirq->name), "ptp-irq-%d", p); + + ptpirq->domain = irq_domain_add_linear(dev->dev->of_node, ptpirq->nirqs, + &ksz_ptp_irq_domain_ops, ptpirq); + if (!ptpirq->domain) + return -ENOMEM; + + for (irq = 0; irq < ptpirq->nirqs; irq++) + irq_create_mapping(ptpirq->domain, irq); + + ptpirq->irq_num = irq_find_mapping(port->pirq.domain, PORT_SRC_PTP_INT); + if (ptpirq->irq_num < 0) { + ret = ptpirq->irq_num; + goto out; + } + + ret = request_threaded_irq(ptpirq->irq_num, NULL, ksz_ptp_irq_thread_fn, + IRQF_ONESHOT, ptpirq->name, ptpirq); + if (ret) + goto out; + + for (irq = 0; irq < ptpirq->nirqs; irq++) { + ret = ksz_ptp_msg_irq_setup(port, irq); + if (ret) + goto out_ptp_msg; + } + + return 0; + +out_ptp_msg: + free_irq(ptpirq->irq_num, ptpirq); + while (irq--) + free_irq(port->ptpmsg_irq[irq].num, &port->ptpmsg_irq[irq]); +out: + for (irq = 0; irq < ptpirq->nirqs; irq++) + irq_dispose_mapping(port->ptpmsg_irq[irq].num); + + irq_domain_remove(ptpirq->domain); + + return ret; +} + +void ksz_ptp_irq_free(struct dsa_switch *ds, u8 p) +{ + struct ksz_device *dev = ds->priv; + struct ksz_port *port = &dev->ports[p]; + struct ksz_irq *ptpirq = &port->ptpirq; + u8 n; + + for (n = 0; n < ptpirq->nirqs; n++) + ksz_ptp_msg_irq_free(port, n); + + free_irq(ptpirq->irq_num, ptpirq); + irq_dispose_mapping(ptpirq->irq_num); + + irq_domain_remove(ptpirq->domain); +} + MODULE_AUTHOR("Christian Eggers "); MODULE_AUTHOR("Arun Ramadoss "); MODULE_DESCRIPTION("PTP support for KSZ switch"); diff --git a/drivers/net/dsa/microchip/ksz_ptp.h b/drivers/net/dsa/microchip/ksz_ptp.h index 2c29a0b604bb..7c5679372705 100644 --- a/drivers/net/dsa/microchip/ksz_ptp.h +++ b/drivers/net/dsa/microchip/ksz_ptp.h @@ -30,6 +30,8 @@ int ksz_get_ts_info(struct dsa_switch *ds, int port, struct ethtool_ts_info *ts); int ksz_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr); int ksz_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr); +int ksz_ptp_irq_setup(struct dsa_switch *ds, u8 p); +void ksz_ptp_irq_free(struct dsa_switch *ds, u8 p); #else @@ -45,6 +47,13 @@ static inline int ksz_ptp_clock_register(struct dsa_switch *ds) static inline void ksz_ptp_clock_unregister(struct dsa_switch *ds) { } +static inline int ksz_ptp_irq_setup(struct dsa_switch *ds, u8 p) +{ + return 0; +} + +static inline void ksz_ptp_irq_free(struct dsa_switch *ds, u8 p) {} + #define ksz_get_ts_info NULL #define ksz_hwtstamp_get NULL diff --git a/drivers/net/dsa/microchip/ksz_ptp_reg.h b/drivers/net/dsa/microchip/ksz_ptp_reg.h index 4ca4ad4bba7e..abe95bbefc12 100644 --- a/drivers/net/dsa/microchip/ksz_ptp_reg.h +++ b/drivers/net/dsa/microchip/ksz_ptp_reg.h @@ -49,4 +49,23 @@ #define PTP_MASTER BIT(1) #define PTP_1STEP BIT(0) +/* Port PTP Register */ +#define REG_PTP_PORT_RX_DELAY__2 0x0C00 +#define REG_PTP_PORT_TX_DELAY__2 0x0C02 +#define REG_PTP_PORT_ASYM_DELAY__2 0x0C04 + +#define REG_PTP_PORT_XDELAY_TS 0x0C08 +#define REG_PTP_PORT_SYNC_TS 0x0C0C +#define REG_PTP_PORT_PDRESP_TS 0x0C10 + +#define REG_PTP_PORT_TX_INT_STATUS__2 0x0C14 +#define REG_PTP_PORT_TX_INT_ENABLE__2 0x0C16 + +#define PTP_PORT_SYNC_INT BIT(15) +#define PTP_PORT_XDELAY_REQ_INT BIT(14) +#define PTP_PORT_PDELAY_RESP_INT BIT(13) +#define KSZ_SYNC_MSG 2 +#define KSZ_XDREQ_MSG 1 +#define KSZ_PDRES_MSG 0 + #endif