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0d5f54fec0
With the low speed Ethernet connection CPDMA notification about packet processing can be received before CPTS TX timestamp event, which is set when packet actually left CPSW while cpdma notification is sent when packet pushed in CPSW fifo. As result, when connection is slow and CPU is fast enough TX timestamping is not working properly. Fix it, by introducing TX SKB queue to store PTP SKBs for which Ethernet Transmit Event hasn't been received yet and then re-check this queue with new Ethernet Transmit Events by scheduling CPTS overflow work more often (every 1 jiffies) until TX SKB queue is not empty. Side effect of this change is: - User space tools require to take into account possible delay in TX timestamp processing (for example ptp4l works with tx_timestamp_timeout=400 under net traffic and tx_timestamp_timeout=25 in idle). Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
226 lines
6.3 KiB
C
226 lines
6.3 KiB
C
/*
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* TI Common Platform Time Sync
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*
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* Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _TI_CPTS_H_
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#define _TI_CPTS_H_
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#if IS_ENABLED(CONFIG_TI_CPTS)
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#include <linux/clk.h>
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#include <linux/clkdev.h>
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#include <linux/clocksource.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/of.h>
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#include <linux/ptp_clock_kernel.h>
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#include <linux/skbuff.h>
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#include <linux/ptp_classify.h>
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#include <linux/timecounter.h>
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struct cpsw_cpts {
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u32 idver; /* Identification and version */
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u32 control; /* Time sync control */
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u32 res1;
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u32 ts_push; /* Time stamp event push */
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u32 ts_load_val; /* Time stamp load value */
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u32 ts_load_en; /* Time stamp load enable */
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u32 res2[2];
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u32 intstat_raw; /* Time sync interrupt status raw */
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u32 intstat_masked; /* Time sync interrupt status masked */
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u32 int_enable; /* Time sync interrupt enable */
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u32 res3;
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u32 event_pop; /* Event interrupt pop */
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u32 event_low; /* 32 Bit Event Time Stamp */
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u32 event_high; /* Event Type Fields */
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};
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/* Bit definitions for the IDVER register */
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#define TX_IDENT_SHIFT (16) /* TX Identification Value */
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#define TX_IDENT_MASK (0xffff)
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#define RTL_VER_SHIFT (11) /* RTL Version Value */
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#define RTL_VER_MASK (0x1f)
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#define MAJOR_VER_SHIFT (8) /* Major Version Value */
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#define MAJOR_VER_MASK (0x7)
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#define MINOR_VER_SHIFT (0) /* Minor Version Value */
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#define MINOR_VER_MASK (0xff)
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/* Bit definitions for the CONTROL register */
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#define HW4_TS_PUSH_EN (1<<11) /* Hardware push 4 enable */
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#define HW3_TS_PUSH_EN (1<<10) /* Hardware push 3 enable */
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#define HW2_TS_PUSH_EN (1<<9) /* Hardware push 2 enable */
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#define HW1_TS_PUSH_EN (1<<8) /* Hardware push 1 enable */
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#define INT_TEST (1<<1) /* Interrupt Test */
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#define CPTS_EN (1<<0) /* Time Sync Enable */
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/*
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* Definitions for the single bit resisters:
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* TS_PUSH TS_LOAD_EN INTSTAT_RAW INTSTAT_MASKED INT_ENABLE EVENT_POP
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*/
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#define TS_PUSH (1<<0) /* Time stamp event push */
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#define TS_LOAD_EN (1<<0) /* Time Stamp Load */
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#define TS_PEND_RAW (1<<0) /* int read (before enable) */
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#define TS_PEND (1<<0) /* masked interrupt read (after enable) */
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#define TS_PEND_EN (1<<0) /* masked interrupt enable */
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#define EVENT_POP (1<<0) /* writing discards one event */
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/* Bit definitions for the EVENT_HIGH register */
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#define PORT_NUMBER_SHIFT (24) /* Indicates Ethernet port or HW pin */
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#define PORT_NUMBER_MASK (0x1f)
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#define EVENT_TYPE_SHIFT (20) /* Time sync event type */
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#define EVENT_TYPE_MASK (0xf)
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#define MESSAGE_TYPE_SHIFT (16) /* PTP message type */
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#define MESSAGE_TYPE_MASK (0xf)
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#define SEQUENCE_ID_SHIFT (0) /* PTP message sequence ID */
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#define SEQUENCE_ID_MASK (0xffff)
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enum {
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CPTS_EV_PUSH, /* Time Stamp Push Event */
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CPTS_EV_ROLL, /* Time Stamp Rollover Event */
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CPTS_EV_HALF, /* Time Stamp Half Rollover Event */
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CPTS_EV_HW, /* Hardware Time Stamp Push Event */
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CPTS_EV_RX, /* Ethernet Receive Event */
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CPTS_EV_TX, /* Ethernet Transmit Event */
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};
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#define CPTS_FIFO_DEPTH 16
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#define CPTS_MAX_EVENTS 32
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struct cpts_event {
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struct list_head list;
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unsigned long tmo;
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u32 high;
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u32 low;
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};
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struct cpts {
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struct device *dev;
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struct cpsw_cpts __iomem *reg;
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int tx_enable;
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int rx_enable;
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struct ptp_clock_info info;
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struct ptp_clock *clock;
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spinlock_t lock; /* protects time registers */
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u32 cc_mult; /* for the nominal frequency */
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struct cyclecounter cc;
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struct timecounter tc;
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int phc_index;
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struct clk *refclk;
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struct list_head events;
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struct list_head pool;
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struct cpts_event pool_data[CPTS_MAX_EVENTS];
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unsigned long ov_check_period;
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struct sk_buff_head txq;
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};
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void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb);
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void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb);
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int cpts_register(struct cpts *cpts);
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void cpts_unregister(struct cpts *cpts);
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struct cpts *cpts_create(struct device *dev, void __iomem *regs,
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struct device_node *node);
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void cpts_release(struct cpts *cpts);
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static inline void cpts_rx_enable(struct cpts *cpts, int enable)
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{
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cpts->rx_enable = enable;
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}
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static inline bool cpts_is_rx_enabled(struct cpts *cpts)
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{
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return !!cpts->rx_enable;
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}
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static inline void cpts_tx_enable(struct cpts *cpts, int enable)
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{
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cpts->tx_enable = enable;
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}
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static inline bool cpts_is_tx_enabled(struct cpts *cpts)
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{
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return !!cpts->tx_enable;
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}
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static inline bool cpts_can_timestamp(struct cpts *cpts, struct sk_buff *skb)
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{
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unsigned int class = ptp_classify_raw(skb);
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if (class == PTP_CLASS_NONE)
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return false;
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return true;
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}
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#else
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struct cpts;
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static inline void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
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{
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}
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static inline void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)
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{
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}
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static inline
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struct cpts *cpts_create(struct device *dev, void __iomem *regs,
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struct device_node *node)
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{
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return NULL;
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}
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static inline void cpts_release(struct cpts *cpts)
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{
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}
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static inline int
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cpts_register(struct cpts *cpts)
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{
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return 0;
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}
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static inline void cpts_unregister(struct cpts *cpts)
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{
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}
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static inline void cpts_rx_enable(struct cpts *cpts, int enable)
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{
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}
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static inline bool cpts_is_rx_enabled(struct cpts *cpts)
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{
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return false;
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}
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static inline void cpts_tx_enable(struct cpts *cpts, int enable)
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{
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}
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static inline bool cpts_is_tx_enabled(struct cpts *cpts)
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{
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return false;
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}
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static inline bool cpts_can_timestamp(struct cpts *cpts, struct sk_buff *skb)
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{
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return false;
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}
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#endif
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#endif
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