1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * TI Common Platform Time Sync 4 * 5 * Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com> 6 * 7 */ 8 #ifndef _TI_CPTS_H_ 9 #define _TI_CPTS_H_ 10 11 #if IS_ENABLED(CONFIG_TI_CPTS) 12 13 #include <linux/clk.h> 14 #include <linux/clkdev.h> 15 #include <linux/clocksource.h> 16 #include <linux/device.h> 17 #include <linux/list.h> 18 #include <linux/of.h> 19 #include <linux/ptp_clock_kernel.h> 20 #include <linux/skbuff.h> 21 #include <linux/ptp_classify.h> 22 #include <linux/timecounter.h> 23 24 struct cpsw_cpts { 25 u32 idver; /* Identification and version */ 26 u32 control; /* Time sync control */ 27 u32 rftclk_sel; /* Reference Clock Select Register */ 28 u32 ts_push; /* Time stamp event push */ 29 u32 ts_load_val; /* Time stamp load value */ 30 u32 ts_load_en; /* Time stamp load enable */ 31 u32 res2[2]; 32 u32 intstat_raw; /* Time sync interrupt status raw */ 33 u32 intstat_masked; /* Time sync interrupt status masked */ 34 u32 int_enable; /* Time sync interrupt enable */ 35 u32 res3; 36 u32 event_pop; /* Event interrupt pop */ 37 u32 event_low; /* 32 Bit Event Time Stamp */ 38 u32 event_high; /* Event Type Fields */ 39 }; 40 41 /* Bit definitions for the IDVER register */ 42 #define TX_IDENT_SHIFT (16) /* TX Identification Value */ 43 #define TX_IDENT_MASK (0xffff) 44 #define RTL_VER_SHIFT (11) /* RTL Version Value */ 45 #define RTL_VER_MASK (0x1f) 46 #define MAJOR_VER_SHIFT (8) /* Major Version Value */ 47 #define MAJOR_VER_MASK (0x7) 48 #define MINOR_VER_SHIFT (0) /* Minor Version Value */ 49 #define MINOR_VER_MASK (0xff) 50 51 /* Bit definitions for the CONTROL register */ 52 #define HW4_TS_PUSH_EN (1<<11) /* Hardware push 4 enable */ 53 #define HW3_TS_PUSH_EN (1<<10) /* Hardware push 3 enable */ 54 #define HW2_TS_PUSH_EN (1<<9) /* Hardware push 2 enable */ 55 #define HW1_TS_PUSH_EN (1<<8) /* Hardware push 1 enable */ 56 #define INT_TEST (1<<1) /* Interrupt Test */ 57 #define CPTS_EN (1<<0) /* Time Sync Enable */ 58 59 /* 60 * Definitions for the single bit resisters: 61 * TS_PUSH TS_LOAD_EN INTSTAT_RAW INTSTAT_MASKED INT_ENABLE EVENT_POP 62 */ 63 #define TS_PUSH (1<<0) /* Time stamp event push */ 64 #define TS_LOAD_EN (1<<0) /* Time Stamp Load */ 65 #define TS_PEND_RAW (1<<0) /* int read (before enable) */ 66 #define TS_PEND (1<<0) /* masked interrupt read (after enable) */ 67 #define TS_PEND_EN (1<<0) /* masked interrupt enable */ 68 #define EVENT_POP (1<<0) /* writing discards one event */ 69 70 /* Bit definitions for the EVENT_HIGH register */ 71 #define PORT_NUMBER_SHIFT (24) /* Indicates Ethernet port or HW pin */ 72 #define PORT_NUMBER_MASK (0x1f) 73 #define EVENT_TYPE_SHIFT (20) /* Time sync event type */ 74 #define EVENT_TYPE_MASK (0xf) 75 #define MESSAGE_TYPE_SHIFT (16) /* PTP message type */ 76 #define MESSAGE_TYPE_MASK (0xf) 77 #define SEQUENCE_ID_SHIFT (0) /* PTP message sequence ID */ 78 #define SEQUENCE_ID_MASK (0xffff) 79 80 enum { 81 CPTS_EV_PUSH, /* Time Stamp Push Event */ 82 CPTS_EV_ROLL, /* Time Stamp Rollover Event */ 83 CPTS_EV_HALF, /* Time Stamp Half Rollover Event */ 84 CPTS_EV_HW, /* Hardware Time Stamp Push Event */ 85 CPTS_EV_RX, /* Ethernet Receive Event */ 86 CPTS_EV_TX, /* Ethernet Transmit Event */ 87 }; 88 89 #define CPTS_FIFO_DEPTH 16 90 #define CPTS_MAX_EVENTS 32 91 92 struct cpts_event { 93 struct list_head list; 94 unsigned long tmo; 95 u32 high; 96 u32 low; 97 }; 98 99 struct cpts { 100 struct device *dev; 101 struct cpsw_cpts __iomem *reg; 102 int tx_enable; 103 int rx_enable; 104 struct ptp_clock_info info; 105 struct ptp_clock *clock; 106 spinlock_t lock; /* protects time registers */ 107 u32 cc_mult; /* for the nominal frequency */ 108 struct cyclecounter cc; 109 struct timecounter tc; 110 int phc_index; 111 struct clk *refclk; 112 struct list_head events; 113 struct list_head pool; 114 struct cpts_event pool_data[CPTS_MAX_EVENTS]; 115 unsigned long ov_check_period; 116 struct sk_buff_head txq; 117 }; 118 119 void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb); 120 void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb); 121 int cpts_register(struct cpts *cpts); 122 void cpts_unregister(struct cpts *cpts); 123 struct cpts *cpts_create(struct device *dev, void __iomem *regs, 124 struct device_node *node); 125 void cpts_release(struct cpts *cpts); 126 127 static inline bool cpts_can_timestamp(struct cpts *cpts, struct sk_buff *skb) 128 { 129 unsigned int class = ptp_classify_raw(skb); 130 131 if (class == PTP_CLASS_NONE) 132 return false; 133 134 return true; 135 } 136 137 #else 138 struct cpts; 139 140 static inline void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb) 141 { 142 } 143 static inline void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb) 144 { 145 } 146 147 static inline 148 struct cpts *cpts_create(struct device *dev, void __iomem *regs, 149 struct device_node *node) 150 { 151 return NULL; 152 } 153 154 static inline void cpts_release(struct cpts *cpts) 155 { 156 } 157 158 static inline int 159 cpts_register(struct cpts *cpts) 160 { 161 return 0; 162 } 163 164 static inline void cpts_unregister(struct cpts *cpts) 165 { 166 } 167 168 static inline bool cpts_can_timestamp(struct cpts *cpts, struct sk_buff *skb) 169 { 170 return false; 171 } 172 #endif 173 174 175 #endif 176