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/*
* TI Common Platform Time Sync
*
* Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>
*
* This program is free software; you can redistribute it 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 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _TI_CPTS_H_
#define _TI_CPTS_H_
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/clocksource.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/skbuff.h>
#include <linux/timecounter.h>
struct cpsw_cpts {
u32 idver; /* Identification and version */
u32 control; /* Time sync control */
u32 res1;
u32 ts_push; /* Time stamp event push */
u32 ts_load_val; /* Time stamp load value */
u32 ts_load_en; /* Time stamp load enable */
u32 res2[2];
u32 intstat_raw; /* Time sync interrupt status raw */
u32 intstat_masked; /* Time sync interrupt status masked */
u32 int_enable; /* Time sync interrupt enable */
u32 res3;
u32 event_pop; /* Event interrupt pop */
u32 event_low; /* 32 Bit Event Time Stamp */
u32 event_high; /* Event Type Fields */
};
/* Bit definitions for the IDVER register */
#define TX_IDENT_SHIFT (16) /* TX Identification Value */
#define TX_IDENT_MASK (0xffff)
#define RTL_VER_SHIFT (11) /* RTL Version Value */
#define RTL_VER_MASK (0x1f)
#define MAJOR_VER_SHIFT (8) /* Major Version Value */
#define MAJOR_VER_MASK (0x7)
#define MINOR_VER_SHIFT (0) /* Minor Version Value */
#define MINOR_VER_MASK (0xff)
/* Bit definitions for the CONTROL register */
#define HW4_TS_PUSH_EN (1<<11) /* Hardware push 4 enable */
#define HW3_TS_PUSH_EN (1<<10) /* Hardware push 3 enable */
#define HW2_TS_PUSH_EN (1<<9) /* Hardware push 2 enable */
#define HW1_TS_PUSH_EN (1<<8) /* Hardware push 1 enable */
#define INT_TEST (1<<1) /* Interrupt Test */
#define CPTS_EN (1<<0) /* Time Sync Enable */
/*
* Definitions for the single bit resisters:
* TS_PUSH TS_LOAD_EN INTSTAT_RAW INTSTAT_MASKED INT_ENABLE EVENT_POP
*/
#define TS_PUSH (1<<0) /* Time stamp event push */
#define TS_LOAD_EN (1<<0) /* Time Stamp Load */
#define TS_PEND_RAW (1<<0) /* int read (before enable) */
#define TS_PEND (1<<0) /* masked interrupt read (after enable) */
#define TS_PEND_EN (1<<0) /* masked interrupt enable */
#define EVENT_POP (1<<0) /* writing discards one event */
/* Bit definitions for the EVENT_HIGH register */
#define PORT_NUMBER_SHIFT (24) /* Indicates Ethernet port or HW pin */
#define PORT_NUMBER_MASK (0x1f)
#define EVENT_TYPE_SHIFT (20) /* Time sync event type */
#define EVENT_TYPE_MASK (0xf)
#define MESSAGE_TYPE_SHIFT (16) /* PTP message type */
#define MESSAGE_TYPE_MASK (0xf)
#define SEQUENCE_ID_SHIFT (0) /* PTP message sequence ID */
#define SEQUENCE_ID_MASK (0xffff)
enum {
CPTS_EV_PUSH, /* Time Stamp Push Event */
CPTS_EV_ROLL, /* Time Stamp Rollover Event */
CPTS_EV_HALF, /* Time Stamp Half Rollover Event */
CPTS_EV_HW, /* Hardware Time Stamp Push Event */
CPTS_EV_RX, /* Ethernet Receive Event */
CPTS_EV_TX, /* Ethernet Transmit Event */
};
/* This covers any input clock up to about 500 MHz. */
#define CPTS_OVERFLOW_PERIOD (HZ * 8)
#define CPTS_FIFO_DEPTH 16
#define CPTS_MAX_EVENTS 32
struct cpts_event {
struct list_head list;
unsigned long tmo;
u32 high;
u32 low;
};
struct cpts {
struct cpsw_cpts __iomem *reg;
int tx_enable;
int rx_enable;
#ifdef CONFIG_TI_CPTS
struct ptp_clock_info info;
struct ptp_clock *clock;
spinlock_t lock; /* protects time registers */
u32 cc_mult; /* for the nominal frequency */
struct cyclecounter cc;
struct timecounter tc;
struct delayed_work overflow_work;
int phc_index;
struct clk *refclk;
struct list_head events;
struct list_head pool;
struct cpts_event pool_data[CPTS_MAX_EVENTS];
#endif
};
#ifdef CONFIG_TI_CPTS
void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb);
void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb);
#else
static inline void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
{
}
static inline void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)
{
}
#endif
int cpts_register(struct device *dev, struct cpts *cpts, u32 mult, u32 shift);
void cpts_unregister(struct cpts *cpts);
#endif
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