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[linux.git] / drivers / net / can / c_can / c_can.h
1 /*
2  * CAN bus driver for Bosch C_CAN controller
3  *
4  * Copyright (C) 2010 ST Microelectronics
5  * Bhupesh Sharma <[email protected]>
6  *
7  * Borrowed heavily from the C_CAN driver originally written by:
8  * Copyright (C) 2007
9  * - Sascha Hauer, Marc Kleine-Budde, Pengutronix <[email protected]>
10  * - Simon Kallweit, intefo AG <[email protected]>
11  *
12  * Bosch C_CAN controller is compliant to CAN protocol version 2.0 part A and B.
13  * Bosch C_CAN user manual can be obtained from:
14  * http://www.semiconductors.bosch.de/media/en/pdf/ipmodules_1/c_can/
15  * users_manual_c_can.pdf
16  *
17  * This file is licensed under the terms of the GNU General Public
18  * License version 2. This program is licensed "as is" without any
19  * warranty of any kind, whether express or implied.
20  */
21
22 #ifndef C_CAN_H
23 #define C_CAN_H
24
25 enum reg {
26         C_CAN_CTRL_REG = 0,
27         C_CAN_CTRL_EX_REG,
28         C_CAN_STS_REG,
29         C_CAN_ERR_CNT_REG,
30         C_CAN_BTR_REG,
31         C_CAN_INT_REG,
32         C_CAN_TEST_REG,
33         C_CAN_BRPEXT_REG,
34         C_CAN_IF1_COMREQ_REG,
35         C_CAN_IF1_COMMSK_REG,
36         C_CAN_IF1_MASK1_REG,
37         C_CAN_IF1_MASK2_REG,
38         C_CAN_IF1_ARB1_REG,
39         C_CAN_IF1_ARB2_REG,
40         C_CAN_IF1_MSGCTRL_REG,
41         C_CAN_IF1_DATA1_REG,
42         C_CAN_IF1_DATA2_REG,
43         C_CAN_IF1_DATA3_REG,
44         C_CAN_IF1_DATA4_REG,
45         C_CAN_IF2_COMREQ_REG,
46         C_CAN_IF2_COMMSK_REG,
47         C_CAN_IF2_MASK1_REG,
48         C_CAN_IF2_MASK2_REG,
49         C_CAN_IF2_ARB1_REG,
50         C_CAN_IF2_ARB2_REG,
51         C_CAN_IF2_MSGCTRL_REG,
52         C_CAN_IF2_DATA1_REG,
53         C_CAN_IF2_DATA2_REG,
54         C_CAN_IF2_DATA3_REG,
55         C_CAN_IF2_DATA4_REG,
56         C_CAN_TXRQST1_REG,
57         C_CAN_TXRQST2_REG,
58         C_CAN_NEWDAT1_REG,
59         C_CAN_NEWDAT2_REG,
60         C_CAN_INTPND1_REG,
61         C_CAN_INTPND2_REG,
62         C_CAN_INTPND3_REG,
63         C_CAN_MSGVAL1_REG,
64         C_CAN_MSGVAL2_REG,
65         C_CAN_FUNCTION_REG,
66 };
67
68 static const u16 __maybe_unused reg_map_c_can[] = {
69         [C_CAN_CTRL_REG]        = 0x00,
70         [C_CAN_STS_REG]         = 0x02,
71         [C_CAN_ERR_CNT_REG]     = 0x04,
72         [C_CAN_BTR_REG]         = 0x06,
73         [C_CAN_INT_REG]         = 0x08,
74         [C_CAN_TEST_REG]        = 0x0A,
75         [C_CAN_BRPEXT_REG]      = 0x0C,
76         [C_CAN_IF1_COMREQ_REG]  = 0x10,
77         [C_CAN_IF1_COMMSK_REG]  = 0x12,
78         [C_CAN_IF1_MASK1_REG]   = 0x14,
79         [C_CAN_IF1_MASK2_REG]   = 0x16,
80         [C_CAN_IF1_ARB1_REG]    = 0x18,
81         [C_CAN_IF1_ARB2_REG]    = 0x1A,
82         [C_CAN_IF1_MSGCTRL_REG] = 0x1C,
83         [C_CAN_IF1_DATA1_REG]   = 0x1E,
84         [C_CAN_IF1_DATA2_REG]   = 0x20,
85         [C_CAN_IF1_DATA3_REG]   = 0x22,
86         [C_CAN_IF1_DATA4_REG]   = 0x24,
87         [C_CAN_IF2_COMREQ_REG]  = 0x40,
88         [C_CAN_IF2_COMMSK_REG]  = 0x42,
89         [C_CAN_IF2_MASK1_REG]   = 0x44,
90         [C_CAN_IF2_MASK2_REG]   = 0x46,
91         [C_CAN_IF2_ARB1_REG]    = 0x48,
92         [C_CAN_IF2_ARB2_REG]    = 0x4A,
93         [C_CAN_IF2_MSGCTRL_REG] = 0x4C,
94         [C_CAN_IF2_DATA1_REG]   = 0x4E,
95         [C_CAN_IF2_DATA2_REG]   = 0x50,
96         [C_CAN_IF2_DATA3_REG]   = 0x52,
97         [C_CAN_IF2_DATA4_REG]   = 0x54,
98         [C_CAN_TXRQST1_REG]     = 0x80,
99         [C_CAN_TXRQST2_REG]     = 0x82,
100         [C_CAN_NEWDAT1_REG]     = 0x90,
101         [C_CAN_NEWDAT2_REG]     = 0x92,
102         [C_CAN_INTPND1_REG]     = 0xA0,
103         [C_CAN_INTPND2_REG]     = 0xA2,
104         [C_CAN_MSGVAL1_REG]     = 0xB0,
105         [C_CAN_MSGVAL2_REG]     = 0xB2,
106 };
107
108 static const u16 __maybe_unused reg_map_d_can[] = {
109         [C_CAN_CTRL_REG]        = 0x00,
110         [C_CAN_CTRL_EX_REG]     = 0x02,
111         [C_CAN_STS_REG]         = 0x04,
112         [C_CAN_ERR_CNT_REG]     = 0x08,
113         [C_CAN_BTR_REG]         = 0x0C,
114         [C_CAN_BRPEXT_REG]      = 0x0E,
115         [C_CAN_INT_REG]         = 0x10,
116         [C_CAN_TEST_REG]        = 0x14,
117         [C_CAN_FUNCTION_REG]    = 0x18,
118         [C_CAN_TXRQST1_REG]     = 0x88,
119         [C_CAN_TXRQST2_REG]     = 0x8A,
120         [C_CAN_NEWDAT1_REG]     = 0x9C,
121         [C_CAN_NEWDAT2_REG]     = 0x9E,
122         [C_CAN_INTPND1_REG]     = 0xB0,
123         [C_CAN_INTPND2_REG]     = 0xB2,
124         [C_CAN_INTPND3_REG]     = 0xB4,
125         [C_CAN_MSGVAL1_REG]     = 0xC4,
126         [C_CAN_MSGVAL2_REG]     = 0xC6,
127         [C_CAN_IF1_COMREQ_REG]  = 0x100,
128         [C_CAN_IF1_COMMSK_REG]  = 0x102,
129         [C_CAN_IF1_MASK1_REG]   = 0x104,
130         [C_CAN_IF1_MASK2_REG]   = 0x106,
131         [C_CAN_IF1_ARB1_REG]    = 0x108,
132         [C_CAN_IF1_ARB2_REG]    = 0x10A,
133         [C_CAN_IF1_MSGCTRL_REG] = 0x10C,
134         [C_CAN_IF1_DATA1_REG]   = 0x110,
135         [C_CAN_IF1_DATA2_REG]   = 0x112,
136         [C_CAN_IF1_DATA3_REG]   = 0x114,
137         [C_CAN_IF1_DATA4_REG]   = 0x116,
138         [C_CAN_IF2_COMREQ_REG]  = 0x120,
139         [C_CAN_IF2_COMMSK_REG]  = 0x122,
140         [C_CAN_IF2_MASK1_REG]   = 0x124,
141         [C_CAN_IF2_MASK2_REG]   = 0x126,
142         [C_CAN_IF2_ARB1_REG]    = 0x128,
143         [C_CAN_IF2_ARB2_REG]    = 0x12A,
144         [C_CAN_IF2_MSGCTRL_REG] = 0x12C,
145         [C_CAN_IF2_DATA1_REG]   = 0x130,
146         [C_CAN_IF2_DATA2_REG]   = 0x132,
147         [C_CAN_IF2_DATA3_REG]   = 0x134,
148         [C_CAN_IF2_DATA4_REG]   = 0x136,
149 };
150
151 enum c_can_dev_id {
152         BOSCH_C_CAN,
153         BOSCH_D_CAN,
154 };
155
156 struct raminit_bits {
157         u8 start;
158         u8 done;
159 };
160
161 struct c_can_driver_data {
162         enum c_can_dev_id id;
163         unsigned int msg_obj_num;
164
165         /* RAMINIT register description. Optional. */
166         const struct raminit_bits *raminit_bits; /* Array of START/DONE bit positions */
167         u8 raminit_num;         /* Number of CAN instances on the SoC */
168         bool raminit_pulse;     /* If set, sets and clears START bit (pulse) */
169 };
170
171 /* Out of band RAMINIT register access via syscon regmap */
172 struct c_can_raminit {
173         struct regmap *syscon;  /* for raminit ctrl. reg. access */
174         unsigned int reg;       /* register index within syscon */
175         struct raminit_bits bits;
176         bool needs_pulse;
177 };
178
179 /* c_can tx ring structure */
180 struct c_can_tx_ring {
181         unsigned int head;
182         unsigned int tail;
183         unsigned int obj_num;
184 };
185
186 /* c_can private data structure */
187 struct c_can_priv {
188         struct can_priv can;    /* must be the first member */
189         struct napi_struct napi;
190         struct net_device *dev;
191         struct device *device;
192         unsigned int msg_obj_num;
193         unsigned int msg_obj_rx_num;
194         unsigned int msg_obj_tx_num;
195         unsigned int msg_obj_rx_first;
196         unsigned int msg_obj_rx_last;
197         unsigned int msg_obj_tx_first;
198         unsigned int msg_obj_tx_last;
199         u32 msg_obj_rx_mask;
200         atomic_t sie_pending;
201         unsigned long tx_dir;
202         int last_status;
203         struct c_can_tx_ring tx;
204         u16 (*read_reg)(const struct c_can_priv *priv, enum reg index);
205         void (*write_reg)(const struct c_can_priv *priv, enum reg index, u16 val);
206         u32 (*read_reg32)(const struct c_can_priv *priv, enum reg index);
207         void (*write_reg32)(const struct c_can_priv *priv, enum reg index, u32 val);
208         void __iomem *base;
209         const u16 *regs;
210         enum c_can_dev_id type;
211         struct c_can_raminit raminit_sys;       /* RAMINIT via syscon regmap */
212         void (*raminit)(const struct c_can_priv *priv, bool enable);
213         u32 comm_rcv_high;
214 };
215
216 struct net_device *alloc_c_can_dev(int msg_obj_num);
217 void free_c_can_dev(struct net_device *dev);
218 int register_c_can_dev(struct net_device *dev);
219 void unregister_c_can_dev(struct net_device *dev);
220
221 #ifdef CONFIG_PM
222 int c_can_power_up(struct net_device *dev);
223 int c_can_power_down(struct net_device *dev);
224 #endif
225
226 extern const struct ethtool_ops c_can_ethtool_ops;
227
228 static inline u8 c_can_get_tx_head(const struct c_can_tx_ring *ring)
229 {
230         return ring->head & (ring->obj_num - 1);
231 }
232
233 static inline u8 c_can_get_tx_tail(const struct c_can_tx_ring *ring)
234 {
235         return ring->tail & (ring->obj_num - 1);
236 }
237
238 static inline u8 c_can_get_tx_free(const struct c_can_priv *priv,
239                                    const struct c_can_tx_ring *ring)
240 {
241         u8 head = c_can_get_tx_head(ring);
242         u8 tail = c_can_get_tx_tail(ring);
243
244         if (priv->type == BOSCH_D_CAN)
245                 return ring->obj_num - (ring->head - ring->tail);
246
247         /* This is not a FIFO. C/D_CAN sends out the buffers
248          * prioritized. The lowest buffer number wins.
249          */
250         if (head < tail)
251                 return 0;
252
253         return ring->obj_num - head;
254 }
255
256 #endif /* C_CAN_H */
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