aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/can/mscan/mscan.h
blob: e98abb97a0506672ab5cfb2af24fb5484fee61fe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
/*
 * Definitions of consts/structs to drive the Freescale MSCAN.
 *
 * Copyright (C) 2005-2006 Andrey Volkov <avolkov@varma-el.com>,
 *                         Varma Electronics Oy
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the version 2 of the GNU General Public License
 * as published by the Free Software Foundation
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef __MSCAN_H__
#define __MSCAN_H__

#include <linux/clk.h>
#include <linux/types.h>

/* MSCAN control register 0 (CANCTL0) bits */
#define MSCAN_RXFRM		0x80
#define MSCAN_RXACT		0x40
#define MSCAN_CSWAI		0x20
#define MSCAN_SYNCH		0x10
#define MSCAN_TIME		0x08
#define MSCAN_WUPE		0x04
#define MSCAN_SLPRQ		0x02
#define MSCAN_INITRQ		0x01

/* MSCAN control register 1 (CANCTL1) bits */
#define MSCAN_CANE		0x80
#define MSCAN_CLKSRC		0x40
#define MSCAN_LOOPB		0x20
#define MSCAN_LISTEN		0x10
#define MSCAN_BORM		0x08
#define MSCAN_WUPM		0x04
#define MSCAN_SLPAK		0x02
#define MSCAN_INITAK		0x01

/* Use the MPC5XXX MSCAN variant? */
#ifdef CONFIG_PPC
#define MSCAN_FOR_MPC5XXX
#endif

#ifdef MSCAN_FOR_MPC5XXX
#define MSCAN_CLKSRC_BUS	0
#define MSCAN_CLKSRC_XTAL	MSCAN_CLKSRC
#define MSCAN_CLKSRC_IPS	MSCAN_CLKSRC
#else
#define MSCAN_CLKSRC_BUS	MSCAN_CLKSRC
#define MSCAN_CLKSRC_XTAL	0
#endif

/* MSCAN receiver flag register (CANRFLG) bits */
#define MSCAN_WUPIF		0x80
#define MSCAN_CSCIF		0x40
#define MSCAN_RSTAT1		0x20
#define MSCAN_RSTAT0		0x10
#define MSCAN_TSTAT1		0x08
#define MSCAN_TSTAT0		0x04
#define MSCAN_OVRIF		0x02
#define MSCAN_RXF		0x01
#define MSCAN_ERR_IF 		(MSCAN_OVRIF | MSCAN_CSCIF)
#define MSCAN_RSTAT_MSK		(MSCAN_RSTAT1 | MSCAN_RSTAT0)
#define MSCAN_TSTAT_MSK		(MSCAN_TSTAT1 | MSCAN_TSTAT0)
#define MSCAN_STAT_MSK		(MSCAN_RSTAT_MSK | MSCAN_TSTAT_MSK)

#define MSCAN_STATE_BUS_OFF	(MSCAN_RSTAT1 | MSCAN_RSTAT0 | \
				 MSCAN_TSTAT1 | MSCAN_TSTAT0)
#define MSCAN_STATE_TX(canrflg)	(((canrflg)&MSCAN_TSTAT_MSK)>>2)
#define MSCAN_STATE_RX(canrflg)	(((canrflg)&MSCAN_RSTAT_MSK)>>4)
#define MSCAN_STATE_ACTIVE	0
#define MSCAN_STATE_WARNING	1
#define MSCAN_STATE_PASSIVE	2
#define MSCAN_STATE_BUSOFF	3

/* MSCAN receiver interrupt enable register (CANRIER) bits */
#define MSCAN_WUPIE		0x80
#define MSCAN_CSCIE		0x40
#define MSCAN_RSTATE1		0x20
#define MSCAN_RSTATE0		0x10
#define MSCAN_TSTATE1		0x08
#define MSCAN_TSTATE0		0x04
#define MSCAN_OVRIE		0x02
#define MSCAN_RXFIE		0x01

/* MSCAN transmitter flag register (CANTFLG) bits */
#define MSCAN_TXE2		0x04
#define MSCAN_TXE1		0x02
#define MSCAN_TXE0		0x01
#define MSCAN_TXE		(MSCAN_TXE2 | MSCAN_TXE1 | MSCAN_TXE0)

/* MSCAN transmitter interrupt enable register (CANTIER) bits */
#define MSCAN_TXIE2		0x04
#define MSCAN_TXIE1		0x02
#define MSCAN_TXIE0		0x01
#define MSCAN_TXIE		(MSCAN_TXIE2 | MSCAN_TXIE1 | MSCAN_TXIE0)

/* MSCAN transmitter message abort request (CANTARQ) bits */
#define MSCAN_ABTRQ2		0x04
#define MSCAN_ABTRQ1		0x02
#define MSCAN_ABTRQ0		0x01

/* MSCAN transmitter message abort ack (CANTAAK) bits */
#define MSCAN_ABTAK2		0x04
#define MSCAN_ABTAK1		0x02
#define MSCAN_ABTAK0		0x01

/* MSCAN transmit buffer selection (CANTBSEL) bits */
#define MSCAN_TX2		0x04
#define MSCAN_TX1		0x02
#define MSCAN_TX0		0x01

/* MSCAN ID acceptance control register (CANIDAC) bits */
#define MSCAN_IDAM1		0x20
#define MSCAN_IDAM0		0x10
#define MSCAN_IDHIT2		0x04
#define MSCAN_IDHIT1		0x02
#define MSCAN_IDHIT0		0x01

#define MSCAN_AF_32BIT		0x00
#define MSCAN_AF_16BIT		MSCAN_IDAM0
#define MSCAN_AF_8BIT		MSCAN_IDAM1
#define MSCAN_AF_CLOSED		(MSCAN_IDAM0|MSCAN_IDAM1)
#define MSCAN_AF_MASK		(~(MSCAN_IDAM0|MSCAN_IDAM1))

/* MSCAN Miscellaneous Register (CANMISC) bits */
#define MSCAN_BOHOLD		0x01

/* MSCAN Identifier Register (IDR) bits */
#define MSCAN_SFF_RTR_SHIFT	4
#define MSCAN_EFF_RTR_SHIFT	0
#define MSCAN_EFF_FLAGS		0x18	/* IDE + SRR */

#ifdef MSCAN_FOR_MPC5XXX
#define _MSCAN_RESERVED_(n, num) u8 _res##n[num]
#define _MSCAN_RESERVED_DSR_SIZE	2
#else
#define _MSCAN_RESERVED_(n, num)
#define _MSCAN_RESERVED_DSR_SIZE	0
#endif

/* Structure of the hardware registers */
struct mscan_regs {
	/* (see doc S12MSCANV3/D)		  MPC5200    MSCAN */
	u8 canctl0;				/* + 0x00     0x00 */
	u8 canctl1;				/* + 0x01     0x01 */
	_MSCAN_RESERVED_(1, 2);			/* + 0x02          */
	u8 canbtr0;				/* + 0x04     0x02 */
	u8 canbtr1;				/* + 0x05     0x03 */
	_MSCAN_RESERVED_(2, 2);			/* + 0x06          */
	u8 canrflg;				/* + 0x08     0x04 */
	u8 canrier;				/* + 0x09     0x05 */
	_MSCAN_RESERVED_(3, 2);			/* + 0x0a          */
	u8 cantflg;				/* + 0x0c     0x06 */
	u8 cantier;				/* + 0x0d     0x07 */
	_MSCAN_RESERVED_(4, 2);			/* + 0x0e          */
	u8 cantarq;				/* + 0x10     0x08 */
	u8 cantaak;				/* + 0x11     0x09 */
	_MSCAN_RESERVED_(5, 2);			/* + 0x12          */
	u8 cantbsel;				/* + 0x14     0x0a */
	u8 canidac;				/* + 0x15     0x0b */
	u8 reserved;				/* + 0x16     0x0c */
	_MSCAN_RESERVED_(6, 2);			/* + 0x17          */
	u8 canmisc;				/* + 0x19     0x0d */
	_MSCAN_RESERVED_(7, 2);			/* + 0x1a          */
	u8 canrxerr;				/* + 0x1c     0x0e */
	u8 cantxerr;				/* + 0x1d     0x0f */
	_MSCAN_RESERVED_(8, 2);			/* + 0x1e          */
	u16 canidar1_0;				/* + 0x20     0x10 */
	_MSCAN_RESERVED_(9, 2);			/* + 0x22          */
	u16 canidar3_2;				/* + 0x24     0x12 */
	_MSCAN_RESERVED_(10, 2);		/* + 0x26          */
	u16 canidmr1_0;				/* + 0x28     0x14 */
	_MSCAN_RESERVED_(11, 2);		/* + 0x2a          */
	u16 canidmr3_2;				/* + 0x2c     0x16 */
	_MSCAN_RESERVED_(12, 2);		/* + 0x2e          */
	u16 canidar5_4;				/* + 0x30     0x18 */
	_MSCAN_RESERVED_(13, 2);		/* + 0x32          */
	u16 canidar7_6;				/* + 0x34     0x1a */
	_MSCAN_RESERVED_(14, 2);		/* + 0x36          */
	u16 canidmr5_4;				/* + 0x38     0x1c */
	_MSCAN_RESERVED_(15, 2);		/* + 0x3a          */
	u16 canidmr7_6;				/* + 0x3c     0x1e */
	_MSCAN_RESERVED_(16, 2);		/* + 0x3e          */
	struct {
		u16 idr1_0;			/* + 0x40     0x20 */
		_MSCAN_RESERVED_(17, 2);	/* + 0x42          */
		u16 idr3_2;			/* + 0x44     0x22 */
		_MSCAN_RESERVED_(18, 2);	/* + 0x46          */
		u16 dsr1_0;			/* + 0x48     0x24 */
		_MSCAN_RESERVED_(19, 2);	/* + 0x4a          */
		u16 dsr3_2;			/* + 0x4c     0x26 */
		_MSCAN_RESERVED_(20, 2);	/* + 0x4e          */
		u16 dsr5_4;			/* + 0x50     0x28 */
		_MSCAN_RESERVED_(21, 2);	/* + 0x52          */
		u16 dsr7_6;			/* + 0x54     0x2a */
		_MSCAN_RESERVED_(22, 2);	/* + 0x56          */
		u8 dlr;				/* + 0x58     0x2c */
		u8 reserved;			/* + 0x59     0x2d */
		_MSCAN_RESERVED_(23, 2);	/* + 0x5a          */
		u16 time;			/* + 0x5c     0x2e */
	} rx;
	_MSCAN_RESERVED_(24, 2);		/* + 0x5e          */
	struct {
		u16 idr1_0;			/* + 0x60     0x30 */
		_MSCAN_RESERVED_(25, 2);	/* + 0x62          */
		u16 idr3_2;			/* + 0x64     0x32 */
		_MSCAN_RESERVED_(26, 2);	/* + 0x66          */
		u16 dsr1_0;			/* + 0x68     0x34 */
		_MSCAN_RESERVED_(27, 2);	/* + 0x6a          */
		u16 dsr3_2;			/* + 0x6c     0x36 */
		_MSCAN_RESERVED_(28, 2);	/* + 0x6e          */
		u16 dsr5_4;			/* + 0x70     0x38 */
		_MSCAN_RESERVED_(29, 2);	/* + 0x72          */
		u16 dsr7_6;			/* + 0x74     0x3a */
		_MSCAN_RESERVED_(30, 2);	/* + 0x76          */
		u8 dlr;				/* + 0x78     0x3c */
		u8 tbpr;			/* + 0x79     0x3d */
		_MSCAN_RESERVED_(31, 2);	/* + 0x7a          */
		u16 time;			/* + 0x7c     0x3e */
	} tx;
	_MSCAN_RESERVED_(32, 2);		/* + 0x7e          */
} __packed;

#undef _MSCAN_RESERVED_
#define MSCAN_REGION 	sizeof(struct mscan)

#define MSCAN_NORMAL_MODE	0
#define MSCAN_SLEEP_MODE	MSCAN_SLPRQ
#define MSCAN_INIT_MODE		(MSCAN_INITRQ | MSCAN_SLPRQ)
#define MSCAN_POWEROFF_MODE	(MSCAN_CSWAI | MSCAN_SLPRQ)
#define MSCAN_SET_MODE_RETRIES	255
#define MSCAN_ECHO_SKB_MAX	3
#define MSCAN_RX_INTS_ENABLE	(MSCAN_OVRIE | MSCAN_RXFIE | MSCAN_CSCIE | \
				 MSCAN_RSTATE1 | MSCAN_RSTATE0 | \
				 MSCAN_TSTATE1 | MSCAN_TSTATE0)

/* MSCAN type variants */
enum {
	MSCAN_TYPE_MPC5200,
	MSCAN_TYPE_MPC5121
};

#define BTR0_BRP_MASK		0x3f
#define BTR0_SJW_SHIFT		6
#define BTR0_SJW_MASK		(0x3 << BTR0_SJW_SHIFT)

#define BTR1_TSEG1_MASK 	0xf
#define BTR1_TSEG2_SHIFT	4
#define BTR1_TSEG2_MASK 	(0x7 << BTR1_TSEG2_SHIFT)
#define BTR1_SAM_SHIFT  	7

#define BTR0_SET_BRP(brp)	(((brp) - 1) & BTR0_BRP_MASK)
#define BTR0_SET_SJW(sjw)	((((sjw) - 1) << BTR0_SJW_SHIFT) & \
				 BTR0_SJW_MASK)

#define BTR1_SET_TSEG1(tseg1)	(((tseg1) - 1) &  BTR1_TSEG1_MASK)
#define BTR1_SET_TSEG2(tseg2)	((((tseg2) - 1) << BTR1_TSEG2_SHIFT) & \
				 BTR1_TSEG2_MASK)
#define BTR1_SET_SAM(sam)	((sam) ? 1 << BTR1_SAM_SHIFT : 0)

#define F_RX_PROGRESS	0
#define F_TX_PROGRESS	1
#define F_TX_WAIT_ALL	2

#define TX_QUEUE_SIZE	3

struct tx_queue_entry {
	struct list_head list;
	u8 mask;
	u8 id;
};

struct mscan_priv {
	struct can_priv can;	/* must be the first member */
	unsigned int type; 	/* MSCAN type variants */
	unsigned long flags;
	void __iomem *reg_base;	/* ioremap'ed address to registers */
	struct clk *clk_ipg;	/* clock for registers */
	struct clk *clk_can;	/* clock for bitrates */
	u8 shadow_statflg;
	u8 shadow_canrier;
	u8 cur_pri;
	u8 prev_buf_id;
	u8 tx_active;

	struct list_head tx_head;
	struct tx_queue_entry tx_queue[TX_QUEUE_SIZE];
	struct napi_struct napi;
};

struct net_device *alloc_mscandev(void);
int register_mscandev(struct net_device *dev, int mscan_clksrc);
void unregister_mscandev(struct net_device *dev);

#endif /* __MSCAN_H__ */