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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_
#if IS_ENABLED(CONFIG_TI_CPTS)
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/clocksource.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/of.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 rftclk_sel; /* Reference Clock Select Register */
u32 ts_push; /* Time stamp event push */
u32 ts_load_val; /* Time stamp load value */
u32 ts_load_en; /* Time stamp load enable */
u32 ts_comp_val; /* Time stamp comparison value, v1.5 & up */
u32 ts_comp_length; /* Time stamp comp assert len, v1.5 & up */
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 TS_COMP_POL BIT(2) /* TS_COMP Polarity */
#define INT_TEST (1<<1) /* Interrupt Test */
#define CPTS_EN (1<<0) /* Time Sync Enable */
#define CPTS_RFTCLK_SEL_MASK 0x1f
#define CPTS_TS_COMP_LENGTH_MASK 0xffff
/*
* 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 */
CPTS_EV_COMP, /* Time Stamp Compare Event */
};
#define CPTS_FIFO_DEPTH 16
#define CPTS_MAX_EVENTS 32
#define CPTS_EVENT_RX_TX_TIMEOUT 20 /* ms */
#define CPTS_EVENT_HWSTAMP_TIMEOUT 200 /* ms */
struct cpts_event {
struct list_head list;
unsigned long tmo;
u32 high;
u32 low;
};
#define CPTS_CAP_RFTCLK_SEL BIT(0)
#define CPTS_CAP_TS_COMP_EN BIT(1)
#define CPTS_CAP_TS_COMP_POL_LOW_SEL BIT(2)
struct cpts {
struct device *dev;
struct cpsw_cpts __iomem *reg;
int tx_enable;
int rx_enable;
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];
unsigned long ov_check_period;
unsigned long ov_check_period_slow;
u32 rftclk_sel;
u32 ext_ts_inputs;
u32 hw_ts_enable;
u32 caps;
u32 ts_comp_next; /* next time_stamp value to compare with */
u32 ts_comp_length; /* TS_COMP Output pulse width */
u32 ts_comp_one_sec_cycs; /* number of counter cycles in one sec */
int ts_comp_enabled;
struct mutex ptp_clk_mutex; /* sync PTP interface with overflow_work */
};
int cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb);
int cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb);
int cpts_register(struct cpts *cpts);
void cpts_unregister(struct cpts *cpts);
struct cpts *cpts_create(struct device *dev, void __iomem *regs,
struct device_node *node);
void cpts_release(struct cpts *cpts);
static inline void cpts_rx_enable(struct cpts *cpts, int enable)
{
cpts->rx_enable = enable;
}
static inline bool cpts_is_rx_enabled(struct cpts *cpts)
{
return !!cpts->rx_enable;
}
static inline void cpts_tx_enable(struct cpts *cpts, int enable)
{
cpts->tx_enable = enable;
}
static inline bool cpts_is_tx_enabled(struct cpts *cpts)
{
return !!cpts->tx_enable;
}
#else
struct cpts;
static inline int cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
{
return -EOPNOTSUPP;
}
static inline int cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)
{
return -EOPNOTSUPP;
}
static inline
struct cpts *cpts_create(struct device *dev, void __iomem *regs,
struct device_node *node)
{
return NULL;
}
static inline void cpts_release(struct cpts *cpts)
{
}
static inline int
cpts_register(struct cpts *cpts)
{
return 0;
}
static inline void cpts_unregister(struct cpts *cpts)
{
}
static inline void cpts_rx_enable(struct cpts *cpts, int enable)
{
}
static inline bool cpts_is_rx_enabled(struct cpts *cpts)
{
return false;
}
static inline void cpts_tx_enable(struct cpts *cpts, int enable)
{
}
static inline bool cpts_is_tx_enabled(struct cpts *cpts)
{
return false;
}
#endif
#endif
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