Linux/include/linux/can/bittiming.h

Version: ~ [ linux-6.11.5 ] ~ [ linux-6.10.14 ] ~ [ linux-6.9.12 ] ~ [ linux-6.8.12 ] ~ [ linux-6.7.12 ] ~ [ linux-6.6.58 ] ~ [ linux-6.5.13 ] ~ [ linux-6.4.16 ] ~ [ linux-6.3.13 ] ~ [ linux-6.2.16 ] ~ [ linux-6.1.114 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.169 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.228 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.284 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.322 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.336 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.4.302 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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1 /* SPDX-License-Identifier: GPL-2.0-only */ 1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* Copyright (c) 2020 Pengutronix, Marc Kleine 2 /* Copyright (c) 2020 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de> 3 * Copyright (c) 2021 Vincent Mailhol <mailhol << 4 */ 3 */ 5 4 6 #ifndef _CAN_BITTIMING_H 5 #ifndef _CAN_BITTIMING_H 7 #define _CAN_BITTIMING_H 6 #define _CAN_BITTIMING_H 8 7 9 #include <linux/netdevice.h> 8 #include <linux/netdevice.h> 10 #include <linux/can/netlink.h> 9 #include <linux/can/netlink.h> 11 10 12 #define CAN_SYNC_SEG 1 11 #define CAN_SYNC_SEG 1 13 12 14 #define CAN_BITRATE_UNSET 0 << 15 #define CAN_BITRATE_UNKNOWN (-1U) << 16 << 17 #define CAN_CTRLMODE_TDC_MASK << 18 (CAN_CTRLMODE_TDC_AUTO | CAN_CTRLMODE_ << 19 << 20 /* << 21 * struct can_tdc - CAN FD Transmission Delay << 22 * << 23 * At high bit rates, the propagation delay fr << 24 * pin of the transceiver causes measurement e << 25 * on the RX pin might occur on the previous b << 26 * << 27 * To solve this issue, ISO 11898-1 introduces << 28 * "Transmitter delay compensation" a SSP (Sec << 29 * equal to the distance from the start of the << 30 * to the actual measurement on the RX pin. << 31 * << 32 * This structure contains the parameters to c << 33 * << 34 * -+----------- one bit ----------+-- TX pin << 35 * |<--- Sample Point --->| << 36 * << 37 * --+----------- one << 38 * |<-------- TDCV -------->| << 39 * |<------- TDCO -- << 40 * |<----------- Secondary Sample Point ----- << 41 * << 42 * To increase precision, contrary to the othe << 43 * which are measured in time quanta, the TDC << 44 * in clock periods (also referred as "minimum << 45 * 11898-1). << 46 * << 47 * @tdcv: Transmitter Delay Compensation Value << 48 * the signal to propagate, i.e. the dist << 49 * from the start of the bit on the TX pi << 50 * on the RX pin. @tdcv depends on the co << 51 * << 52 * CAN_CTRLMODE_TDC_AUTO is set: The tr << 53 * measures @tdcv for each transmitted << 54 * value provided here should be ignore << 55 * << 56 * CAN_CTRLMODE_TDC_MANUAL is set: use << 57 * value. << 58 * << 59 * N.B. CAN_CTRLMODE_TDC_AUTO and CAN_CTR << 60 * mutually exclusive. Only one can be se << 61 * CAN_TDC_CTRLMODE_AUTO and CAN_TDC_CTRL << 62 * TDC is disabled and all the values of << 63 * ignored. << 64 * << 65 * @tdco: Transmitter Delay Compensation Offse << 66 * clock periods, defining the distance b << 67 * bit reception on the RX pin of the tra << 68 * position such that SSP = @tdcv + @tdco << 69 * << 70 * @tdcf: Transmitter Delay Compensation Filte << 71 * minimum value for the SSP position in << 72 * SSP position is less than @tdcf, then << 73 * occur and the normal sampling point is << 74 * feature is enabled if and only if @tdc << 75 * (automatic mode) and @tdcf is configur << 76 * than @tdco. << 77 */ << 78 struct can_tdc { << 79 u32 tdcv; << 80 u32 tdco; << 81 u32 tdcf; << 82 }; << 83 << 84 /* << 85 * struct can_tdc_const - CAN hardware-depende << 86 * Transmission Delay Compensation << 87 * << 88 * @tdcv_min: Transmitter Delay Compensation V << 89 * the controller does not support manual << 90 * (c.f. flag CAN_CTRLMODE_TDC_MANUAL) th << 91 * ignored. << 92 * @tdcv_max: Transmitter Delay Compensation V << 93 * the controller does not support manual << 94 * (c.f. flag CAN_CTRLMODE_TDC_MANUAL) th << 95 * ignored. << 96 * << 97 * @tdco_min: Transmitter Delay Compensation O << 98 * @tdco_max: Transmitter Delay Compensation O << 99 * Should not be zero. If the controller << 100 * then the pointer to this structure sho << 101 * << 102 * @tdcf_min: Transmitter Delay Compensation F << 103 * value. If @tdcf_max is zero, this valu << 104 * @tdcf_max: Transmitter Delay Compensation F << 105 * value. Should be set to zero if the co << 106 * support this feature. << 107 */ << 108 struct can_tdc_const { << 109 u32 tdcv_min; << 110 u32 tdcv_max; << 111 u32 tdco_min; << 112 u32 tdco_max; << 113 u32 tdcf_min; << 114 u32 tdcf_max; << 115 }; << 116 << 117 #ifdef CONFIG_CAN_CALC_BITTIMING 13 #ifdef CONFIG_CAN_CALC_BITTIMING 118 int can_calc_bittiming(const struct net_device !! 14 int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt, 119 const struct can_bittim !! 15 const struct can_bittiming_const *btc); 120 << 121 void can_calc_tdco(struct can_tdc *tdc, const << 122 const struct can_bittiming << 123 u32 *ctrlmode, u32 ctrlmode << 124 #else /* !CONFIG_CAN_CALC_BITTIMING */ 16 #else /* !CONFIG_CAN_CALC_BITTIMING */ 125 static inline int 17 static inline int 126 can_calc_bittiming(const struct net_device *de !! 18 can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt, 127 const struct can_bittiming_ !! 19 const struct can_bittiming_const *btc) 128 { 20 { 129 netdev_err(dev, "bit-timing calculatio 21 netdev_err(dev, "bit-timing calculation not available\n"); 130 return -EINVAL; 22 return -EINVAL; 131 } 23 } 132 << 133 static inline void << 134 can_calc_tdco(struct can_tdc *tdc, const struc << 135 const struct can_bittiming *dbt, << 136 u32 *ctrlmode, u32 ctrlmode_supp << 137 { << 138 } << 139 #endif /* CONFIG_CAN_CALC_BITTIMING */ 24 #endif /* CONFIG_CAN_CALC_BITTIMING */ 140 25 141 void can_sjw_set_default(struct can_bittiming !! 26 int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt, 142 << 143 int can_sjw_check(const struct net_device *dev << 144 const struct can_bittiming_c << 145 << 146 int can_get_bittiming(const struct net_device << 147 const struct can_bittimi 27 const struct can_bittiming_const *btc, 148 const u32 *bitrate_const 28 const u32 *bitrate_const, 149 const unsigned int bitra !! 29 const unsigned int bitrate_const_cnt); 150 struct netlink_ext_ack * << 151 30 152 /* 31 /* 153 * can_bit_time() - Duration of one bit 32 * can_bit_time() - Duration of one bit 154 * 33 * 155 * Please refer to ISO 11898-1:2015, section 1 34 * Please refer to ISO 11898-1:2015, section 11.3.1.1 "Bit time" for 156 * additional information. 35 * additional information. 157 * 36 * 158 * Return: the number of time quanta in one bi 37 * Return: the number of time quanta in one bit. 159 */ 38 */ 160 static inline unsigned int can_bit_time(const 39 static inline unsigned int can_bit_time(const struct can_bittiming *bt) 161 { 40 { 162 return CAN_SYNC_SEG + bt->prop_seg + b 41 return CAN_SYNC_SEG + bt->prop_seg + bt->phase_seg1 + bt->phase_seg2; 163 } 42 } 164 43 165 #endif /* !_CAN_BITTIMING_H */ 44 #endif /* !_CAN_BITTIMING_H */ 166 45

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TOMOYO Linux Cross Reference
Linux/include/linux/can/bittiming.h

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Differences between /include/linux/can/bittiming.h (Version linux-6.11.5) and /include/linux/can/bittiming.h (Version linux-5.12.19)

TOMOYO Linux Cross Reference Linux/include/linux/can/bittiming.h

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Differences between /include/linux/can/bittiming.h (Version linux-6.11.5) and /include/linux/can/bittiming.h (Version linux-5.12.19)

TOMOYO Linux Cross Reference
Linux/include/linux/can/bittiming.h