summaryrefslogtreecommitdiff
path: root/drivers/net/can/sja1000/sja1000.h
blob: 23fff06875f5703601b1a608937c67f3944422fb (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
/*
 * sja1000.h -  Philips SJA1000 network device driver
 *
 * Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
 * 38106 Braunschweig, GERMANY
 *
 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Volkswagen nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * Alternatively, provided that this notice is retained in full, this
 * software may be distributed under the terms of the GNU General
 * Public License ("GPL") version 2, in which case the provisions of the
 * GPL apply INSTEAD OF those given above.
 *
 * The provided data structures and external interfaces from this code
 * are not restricted to be used by modules with a GPL compatible license.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 */

#ifndef SJA1000_DEV_H
#define SJA1000_DEV_H

#include <linux/irqreturn.h>
#include <linux/can/dev.h>
#include <linux/can/platform/sja1000.h>

#define SJA1000_ECHO_SKB_MAX	1 /* the SJA1000 has one TX buffer object */

#define SJA1000_MAX_IRQ 20	/* max. number of interrupts handled in ISR */

/* SJA1000 registers - manual section 6.4 (Pelican Mode) */
#define REG_MOD		0x00
#define REG_CMR		0x01
#define REG_SR		0x02
#define REG_IR		0x03
#define REG_IER		0x04
#define REG_ALC		0x0B
#define REG_ECC		0x0C
#define REG_EWL		0x0D
#define REG_RXERR	0x0E
#define REG_TXERR	0x0F
#define REG_ACCC0	0x10
#define REG_ACCC1	0x11
#define REG_ACCC2	0x12
#define REG_ACCC3	0x13
#define REG_ACCM0	0x14
#define REG_ACCM1	0x15
#define REG_ACCM2	0x16
#define REG_ACCM3	0x17
#define REG_RMC		0x1D
#define REG_RBSA	0x1E

/* Common registers - manual section 6.5 */
#define REG_BTR0	0x06
#define REG_BTR1	0x07
#define REG_OCR		0x08
#define REG_CDR		0x1F

#define REG_FI		0x10
#define SFF_BUF		0x13
#define EFF_BUF		0x15

#define FI_FF		0x80
#define FI_RTR		0x40

#define REG_ID1		0x11
#define REG_ID2		0x12
#define REG_ID3		0x13
#define REG_ID4		0x14

#define CAN_RAM		0x20

/* mode register */
#define MOD_RM		0x01
#define MOD_LOM		0x02
#define MOD_STM		0x04
#define MOD_AFM		0x08
#define MOD_SM		0x10

/* commands */
#define CMD_SRR		0x10
#define CMD_CDO		0x08
#define CMD_RRB		0x04
#define CMD_AT		0x02
#define CMD_TR		0x01

/* interrupt sources */
#define IRQ_BEI		0x80
#define IRQ_ALI		0x40
#define IRQ_EPI		0x20
#define IRQ_WUI		0x10
#define IRQ_DOI		0x08
#define IRQ_EI		0x04
#define IRQ_TI		0x02
#define IRQ_RI		0x01
#define IRQ_ALL		0xFF
#define IRQ_OFF		0x00

/* status register content */
#define SR_BS		0x80
#define SR_ES		0x40
#define SR_TS		0x20
#define SR_RS		0x10
#define SR_TCS		0x08
#define SR_TBS		0x04
#define SR_DOS		0x02
#define SR_RBS		0x01

#define SR_CRIT (SR_BS|SR_ES)

/* ECC register */
#define ECC_SEG		0x1F
#define ECC_DIR		0x20
#define ECC_ERR		6
#define ECC_BIT		0x00
#define ECC_FORM	0x40
#define ECC_STUFF	0x80
#define ECC_MASK	0xc0

/*
 * Flags for sja1000priv.flags
 */
#define SJA1000_CUSTOM_IRQ_HANDLER 0x1

/*
 * SJA1000 private data structure
 */
struct sja1000_priv {
	struct can_priv can;	/* must be the first member */
	int open_time;
	struct sk_buff *echo_skb;

	/* the lower-layer is responsible for appropriate locking */
	u8 (*read_reg) (const struct sja1000_priv *priv, int reg);
	void (*write_reg) (const struct sja1000_priv *priv, int reg, u8 val);
	void (*pre_irq) (const struct sja1000_priv *priv);
	void (*post_irq) (const struct sja1000_priv *priv);

	void *priv;		/* for board-specific data */
	struct net_device *dev;

	void __iomem *reg_base;	 /* ioremap'ed address to registers */
	unsigned long irq_flags; /* for request_irq() */
	spinlock_t cmdreg_lock;  /* lock for concurrent cmd register writes */

	u16 flags;		/* custom mode flags */
	u8 ocr;			/* output control register */
	u8 cdr;			/* clock divider register */
};

struct net_device *alloc_sja1000dev(int sizeof_priv);
void free_sja1000dev(struct net_device *dev);
int register_sja1000dev(struct net_device *dev);
void unregister_sja1000dev(struct net_device *dev);

irqreturn_t sja1000_interrupt(int irq, void *dev_id);

#endif /* SJA1000_DEV_H */