1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * linux/can/dev.h 3 * linux/can/dev.h
4 * 4 *
5 * Definitions for the CAN network device driv 5 * Definitions for the CAN network device driver interface
6 * 6 *
7 * Copyright (C) 2006 Andrey Volkov <avolkov@v 7 * Copyright (C) 2006 Andrey Volkov <avolkov@varma-el.com>
8 * Varma Electronics Oy 8 * Varma Electronics Oy
9 * 9 *
10 * Copyright (C) 2008 Wolfgang Grandegger <wg@ 10 * Copyright (C) 2008 Wolfgang Grandegger <wg@grandegger.com>
11 * 11 *
12 */ 12 */
13 13
14 #ifndef _CAN_DEV_H 14 #ifndef _CAN_DEV_H
15 #define _CAN_DEV_H 15 #define _CAN_DEV_H
16 16
17 #include <linux/can.h> 17 #include <linux/can.h>
18 #include <linux/can/bittiming.h> 18 #include <linux/can/bittiming.h>
19 #include <linux/can/error.h> 19 #include <linux/can/error.h>
20 #include <linux/can/length.h> 20 #include <linux/can/length.h>
21 #include <linux/can/netlink.h> 21 #include <linux/can/netlink.h>
22 #include <linux/can/skb.h> 22 #include <linux/can/skb.h>
23 #include <linux/ethtool.h> 23 #include <linux/ethtool.h>
24 #include <linux/netdevice.h> 24 #include <linux/netdevice.h>
25 25
26 /* 26 /*
27 * CAN mode 27 * CAN mode
28 */ 28 */
29 enum can_mode { 29 enum can_mode {
30 CAN_MODE_STOP = 0, 30 CAN_MODE_STOP = 0,
31 CAN_MODE_START, 31 CAN_MODE_START,
32 CAN_MODE_SLEEP 32 CAN_MODE_SLEEP
33 }; 33 };
34 34
35 enum can_termination_gpio { 35 enum can_termination_gpio {
36 CAN_TERMINATION_GPIO_DISABLED = 0, 36 CAN_TERMINATION_GPIO_DISABLED = 0,
37 CAN_TERMINATION_GPIO_ENABLED, 37 CAN_TERMINATION_GPIO_ENABLED,
38 CAN_TERMINATION_GPIO_MAX, 38 CAN_TERMINATION_GPIO_MAX,
39 }; 39 };
40 40
41 /* 41 /*
42 * CAN common private data 42 * CAN common private data
43 */ 43 */
44 struct can_priv { 44 struct can_priv {
45 struct net_device *dev; 45 struct net_device *dev;
46 struct can_device_stats can_stats; 46 struct can_device_stats can_stats;
47 47
48 const struct can_bittiming_const *bitt 48 const struct can_bittiming_const *bittiming_const,
49 *data_bittiming_const; 49 *data_bittiming_const;
50 struct can_bittiming bittiming, data_b 50 struct can_bittiming bittiming, data_bittiming;
51 const struct can_tdc_const *tdc_const; 51 const struct can_tdc_const *tdc_const;
52 struct can_tdc tdc; 52 struct can_tdc tdc;
53 53
54 unsigned int bitrate_const_cnt; 54 unsigned int bitrate_const_cnt;
55 const u32 *bitrate_const; 55 const u32 *bitrate_const;
56 const u32 *data_bitrate_const; 56 const u32 *data_bitrate_const;
57 unsigned int data_bitrate_const_cnt; 57 unsigned int data_bitrate_const_cnt;
58 u32 bitrate_max; 58 u32 bitrate_max;
59 struct can_clock clock; 59 struct can_clock clock;
60 60
61 unsigned int termination_const_cnt; 61 unsigned int termination_const_cnt;
62 const u16 *termination_const; 62 const u16 *termination_const;
63 u16 termination; 63 u16 termination;
64 struct gpio_desc *termination_gpio; 64 struct gpio_desc *termination_gpio;
65 u16 termination_gpio_ohms[CAN_TERMINAT 65 u16 termination_gpio_ohms[CAN_TERMINATION_GPIO_MAX];
66 66
67 unsigned int echo_skb_max; 67 unsigned int echo_skb_max;
68 struct sk_buff **echo_skb; 68 struct sk_buff **echo_skb;
69 69
70 enum can_state state; 70 enum can_state state;
71 71
72 /* CAN controller features - see inclu 72 /* CAN controller features - see include/uapi/linux/can/netlink.h */
73 u32 ctrlmode; /* current opt 73 u32 ctrlmode; /* current options setting */
74 u32 ctrlmode_supported; /* options tha 74 u32 ctrlmode_supported; /* options that can be modified by netlink */
75 75
76 int restart_ms; 76 int restart_ms;
77 struct delayed_work restart_work; 77 struct delayed_work restart_work;
78 78
79 int (*do_set_bittiming)(struct net_dev 79 int (*do_set_bittiming)(struct net_device *dev);
80 int (*do_set_data_bittiming)(struct ne 80 int (*do_set_data_bittiming)(struct net_device *dev);
81 int (*do_set_mode)(struct net_device * 81 int (*do_set_mode)(struct net_device *dev, enum can_mode mode);
82 int (*do_set_termination)(struct net_d 82 int (*do_set_termination)(struct net_device *dev, u16 term);
83 int (*do_get_state)(const struct net_d 83 int (*do_get_state)(const struct net_device *dev,
84 enum can_state *st 84 enum can_state *state);
85 int (*do_get_berr_counter)(const struc 85 int (*do_get_berr_counter)(const struct net_device *dev,
86 struct can_ 86 struct can_berr_counter *bec);
87 int (*do_get_auto_tdcv)(const struct n 87 int (*do_get_auto_tdcv)(const struct net_device *dev, u32 *tdcv);
88 }; 88 };
89 89
90 static inline bool can_tdc_is_enabled(const st 90 static inline bool can_tdc_is_enabled(const struct can_priv *priv)
91 { 91 {
92 return !!(priv->ctrlmode & CAN_CTRLMOD 92 return !!(priv->ctrlmode & CAN_CTRLMODE_TDC_MASK);
93 } 93 }
94 94
95 /* 95 /*
96 * can_get_relative_tdco() - TDCO relative to 96 * can_get_relative_tdco() - TDCO relative to the sample point
97 * 97 *
98 * struct can_tdc::tdco represents the absolut 98 * struct can_tdc::tdco represents the absolute offset from TDCV. Some
99 * controllers use instead an offset relative 99 * controllers use instead an offset relative to the Sample Point (SP)
100 * such that: 100 * such that:
101 * 101 *
102 * SSP = TDCV + absolute TDCO 102 * SSP = TDCV + absolute TDCO
103 * = TDCV + SP + relative TDCO 103 * = TDCV + SP + relative TDCO
104 * 104 *
105 * -+----------- one bit ----------+-- TX pin 105 * -+----------- one bit ----------+-- TX pin
106 * |<--- Sample Point --->| 106 * |<--- Sample Point --->|
107 * 107 *
108 * --+----------- one 108 * --+----------- one bit ----------+-- RX pin
109 * |<-------- TDCV -------->| 109 * |<-------- TDCV -------->|
110 * |<--------------- 110 * |<------------------------>| absolute TDCO
111 * |<--- Sample Poin 111 * |<--- Sample Point --->|
112 * | 112 * | |<->| relative TDCO
113 * |<------------- Secondary Sample Point --- 113 * |<------------- Secondary Sample Point ------------>|
114 */ 114 */
115 static inline s32 can_get_relative_tdco(const 115 static inline s32 can_get_relative_tdco(const struct can_priv *priv)
116 { 116 {
117 const struct can_bittiming *dbt = &pri 117 const struct can_bittiming *dbt = &priv->data_bittiming;
118 s32 sample_point_in_tc = (CAN_SYNC_SEG 118 s32 sample_point_in_tc = (CAN_SYNC_SEG + dbt->prop_seg +
119 dbt->phase_s 119 dbt->phase_seg1) * dbt->brp;
120 120
121 return (s32)priv->tdc.tdco - sample_po 121 return (s32)priv->tdc.tdco - sample_point_in_tc;
122 } 122 }
123 123
124 /* helper to define static CAN controller feat 124 /* helper to define static CAN controller features at device creation time */
125 static inline int __must_check can_set_static_ 125 static inline int __must_check can_set_static_ctrlmode(struct net_device *dev,
126 126 u32 static_mode)
127 { 127 {
128 struct can_priv *priv = netdev_priv(de 128 struct can_priv *priv = netdev_priv(dev);
129 129
130 /* alloc_candev() succeeded => netdev_ 130 /* alloc_candev() succeeded => netdev_priv() is valid at this point */
131 if (priv->ctrlmode_supported & static_ 131 if (priv->ctrlmode_supported & static_mode) {
132 netdev_warn(dev, 132 netdev_warn(dev,
133 "Controller featur 133 "Controller features can not be supported and static at the same time\n");
134 return -EINVAL; 134 return -EINVAL;
135 } 135 }
136 priv->ctrlmode = static_mode; 136 priv->ctrlmode = static_mode;
137 137
138 /* override MTU which was set by defau 138 /* override MTU which was set by default in can_setup()? */
139 if (static_mode & CAN_CTRLMODE_FD) 139 if (static_mode & CAN_CTRLMODE_FD)
140 dev->mtu = CANFD_MTU; 140 dev->mtu = CANFD_MTU;
141 141
142 return 0; 142 return 0;
143 } 143 }
144 144
145 static inline u32 can_get_static_ctrlmode(stru 145 static inline u32 can_get_static_ctrlmode(struct can_priv *priv)
146 { 146 {
147 return priv->ctrlmode & ~priv->ctrlmod 147 return priv->ctrlmode & ~priv->ctrlmode_supported;
148 } 148 }
149 149
150 static inline bool can_is_canxl_dev_mtu(unsign 150 static inline bool can_is_canxl_dev_mtu(unsigned int mtu)
151 { 151 {
152 return (mtu >= CANXL_MIN_MTU && mtu <= 152 return (mtu >= CANXL_MIN_MTU && mtu <= CANXL_MAX_MTU);
153 } 153 }
154 154
155 /* drop skb if it does not contain a valid CAN 155 /* drop skb if it does not contain a valid CAN frame for sending */
156 static inline bool can_dev_dropped_skb(struct 156 static inline bool can_dev_dropped_skb(struct net_device *dev, struct sk_buff *skb)
157 { 157 {
158 struct can_priv *priv = netdev_priv(de 158 struct can_priv *priv = netdev_priv(dev);
159 159
160 if (priv->ctrlmode & CAN_CTRLMODE_LIST 160 if (priv->ctrlmode & CAN_CTRLMODE_LISTENONLY) {
161 netdev_info_once(dev, 161 netdev_info_once(dev,
162 "interface in 162 "interface in listen only mode, dropping skb\n");
163 kfree_skb(skb); 163 kfree_skb(skb);
164 dev->stats.tx_dropped++; 164 dev->stats.tx_dropped++;
165 return true; 165 return true;
166 } 166 }
167 167
168 return can_dropped_invalid_skb(dev, sk 168 return can_dropped_invalid_skb(dev, skb);
169 } 169 }
170 170
171 void can_setup(struct net_device *dev); 171 void can_setup(struct net_device *dev);
172 172
173 struct net_device *alloc_candev_mqs(int sizeof 173 struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
174 unsigned i 174 unsigned int txqs, unsigned int rxqs);
175 #define alloc_candev(sizeof_priv, echo_skb_max 175 #define alloc_candev(sizeof_priv, echo_skb_max) \
176 alloc_candev_mqs(sizeof_priv, echo_skb 176 alloc_candev_mqs(sizeof_priv, echo_skb_max, 1, 1)
177 #define alloc_candev_mq(sizeof_priv, echo_skb_ 177 #define alloc_candev_mq(sizeof_priv, echo_skb_max, count) \
178 alloc_candev_mqs(sizeof_priv, echo_skb 178 alloc_candev_mqs(sizeof_priv, echo_skb_max, count, count)
179 void free_candev(struct net_device *dev); 179 void free_candev(struct net_device *dev);
180 180
181 /* a candev safe wrapper around netdev_priv */ 181 /* a candev safe wrapper around netdev_priv */
182 struct can_priv *safe_candev_priv(struct net_d 182 struct can_priv *safe_candev_priv(struct net_device *dev);
183 183
184 int open_candev(struct net_device *dev); 184 int open_candev(struct net_device *dev);
185 void close_candev(struct net_device *dev); 185 void close_candev(struct net_device *dev);
186 int can_change_mtu(struct net_device *dev, int 186 int can_change_mtu(struct net_device *dev, int new_mtu);
187 int can_eth_ioctl_hwts(struct net_device *netd 187 int can_eth_ioctl_hwts(struct net_device *netdev, struct ifreq *ifr, int cmd);
188 int can_ethtool_op_get_ts_info_hwts(struct net 188 int can_ethtool_op_get_ts_info_hwts(struct net_device *dev,
189 struct ker 189 struct kernel_ethtool_ts_info *info);
190 190
191 int register_candev(struct net_device *dev); 191 int register_candev(struct net_device *dev);
192 void unregister_candev(struct net_device *dev) 192 void unregister_candev(struct net_device *dev);
193 193
194 int can_restart_now(struct net_device *dev); 194 int can_restart_now(struct net_device *dev);
195 void can_bus_off(struct net_device *dev); 195 void can_bus_off(struct net_device *dev);
196 196
197 const char *can_get_state_str(const enum can_s 197 const char *can_get_state_str(const enum can_state state);
198 void can_state_get_by_berr_counter(const struc 198 void can_state_get_by_berr_counter(const struct net_device *dev,
199 const struc 199 const struct can_berr_counter *bec,
200 enum can_st 200 enum can_state *tx_state,
201 enum can_st 201 enum can_state *rx_state);
202 void can_change_state(struct net_device *dev, 202 void can_change_state(struct net_device *dev, struct can_frame *cf,
203 enum can_state tx_state, 203 enum can_state tx_state, enum can_state rx_state);
204 204
205 #ifdef CONFIG_OF 205 #ifdef CONFIG_OF
206 void of_can_transceiver(struct net_device *dev 206 void of_can_transceiver(struct net_device *dev);
207 #else 207 #else
208 static inline void of_can_transceiver(struct n 208 static inline void of_can_transceiver(struct net_device *dev) { }
209 #endif 209 #endif
210 210
211 extern struct rtnl_link_ops can_link_ops; 211 extern struct rtnl_link_ops can_link_ops;
212 int can_netlink_register(void); 212 int can_netlink_register(void);
213 void can_netlink_unregister(void); 213 void can_netlink_unregister(void);
214 214
215 #endif /* !_CAN_DEV_H */ 215 #endif /* !_CAN_DEV_H */
216 216
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