xref: /openbmc/linux/drivers/net/can/sja1000/sja1000.h (revision 717c6ec2)
1 /*
2  * sja1000.h -  Philips SJA1000 network device driver
3  *
4  * Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
5  * 38106 Braunschweig, GERMANY
6  *
7  * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of Volkswagen nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * Alternatively, provided that this notice is retained in full, this
23  * software may be distributed under the terms of the GNU General
24  * Public License ("GPL") version 2, in which case the provisions of the
25  * GPL apply INSTEAD OF those given above.
26  *
27  * The provided data structures and external interfaces from this code
28  * are not restricted to be used by modules with a GPL compatible license.
29  *
30  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
31  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
32  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
33  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
34  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
36  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
40  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
41  * DAMAGE.
42  *
43  */
44 
45 #ifndef SJA1000_DEV_H
46 #define SJA1000_DEV_H
47 
48 #include <linux/irqreturn.h>
49 #include <linux/can/dev.h>
50 #include <linux/can/platform/sja1000.h>
51 
52 #define SJA1000_ECHO_SKB_MAX	1 /* the SJA1000 has one TX buffer object */
53 
54 #define SJA1000_MAX_IRQ 20	/* max. number of interrupts handled in ISR */
55 
56 /* SJA1000 registers - manual section 6.4 (Pelican Mode) */
57 #define SJA1000_MOD		0x00
58 #define SJA1000_CMR		0x01
59 #define SJA1000_SR		0x02
60 #define SJA1000_IR		0x03
61 #define SJA1000_IER		0x04
62 #define SJA1000_ALC		0x0B
63 #define SJA1000_ECC		0x0C
64 #define SJA1000_EWL		0x0D
65 #define SJA1000_RXERR		0x0E
66 #define SJA1000_TXERR		0x0F
67 #define SJA1000_ACCC0		0x10
68 #define SJA1000_ACCC1		0x11
69 #define SJA1000_ACCC2		0x12
70 #define SJA1000_ACCC3		0x13
71 #define SJA1000_ACCM0		0x14
72 #define SJA1000_ACCM1		0x15
73 #define SJA1000_ACCM2		0x16
74 #define SJA1000_ACCM3		0x17
75 #define SJA1000_RMC		0x1D
76 #define SJA1000_RBSA		0x1E
77 
78 /* Common registers - manual section 6.5 */
79 #define SJA1000_BTR0		0x06
80 #define SJA1000_BTR1		0x07
81 #define SJA1000_OCR		0x08
82 #define SJA1000_CDR		0x1F
83 
84 #define SJA1000_FI		0x10
85 #define SJA1000_SFF_BUF		0x13
86 #define SJA1000_EFF_BUF		0x15
87 
88 #define SJA1000_FI_FF		0x80
89 #define SJA1000_FI_RTR		0x40
90 
91 #define SJA1000_ID1		0x11
92 #define SJA1000_ID2		0x12
93 #define SJA1000_ID3		0x13
94 #define SJA1000_ID4		0x14
95 
96 #define SJA1000_CAN_RAM		0x20
97 
98 /* mode register */
99 #define MOD_RM		0x01
100 #define MOD_LOM		0x02
101 #define MOD_STM		0x04
102 #define MOD_AFM		0x08
103 #define MOD_SM		0x10
104 
105 /* commands */
106 #define CMD_SRR		0x10
107 #define CMD_CDO		0x08
108 #define CMD_RRB		0x04
109 #define CMD_AT		0x02
110 #define CMD_TR		0x01
111 
112 /* interrupt sources */
113 #define IRQ_BEI		0x80
114 #define IRQ_ALI		0x40
115 #define IRQ_EPI		0x20
116 #define IRQ_WUI		0x10
117 #define IRQ_DOI		0x08
118 #define IRQ_EI		0x04
119 #define IRQ_TI		0x02
120 #define IRQ_RI		0x01
121 #define IRQ_ALL		0xFF
122 #define IRQ_OFF		0x00
123 
124 /* status register content */
125 #define SR_BS		0x80
126 #define SR_ES		0x40
127 #define SR_TS		0x20
128 #define SR_RS		0x10
129 #define SR_TCS		0x08
130 #define SR_TBS		0x04
131 #define SR_DOS		0x02
132 #define SR_RBS		0x01
133 
134 #define SR_CRIT (SR_BS|SR_ES)
135 
136 /* ECC register */
137 #define ECC_SEG		0x1F
138 #define ECC_DIR		0x20
139 #define ECC_ERR		6
140 #define ECC_BIT		0x00
141 #define ECC_FORM	0x40
142 #define ECC_STUFF	0x80
143 #define ECC_MASK	0xc0
144 
145 /*
146  * Flags for sja1000priv.flags
147  */
148 #define SJA1000_CUSTOM_IRQ_HANDLER	BIT(0)
149 #define SJA1000_QUIRK_NO_CDR_REG	BIT(1)
150 #define SJA1000_QUIRK_RESET_ON_OVERRUN	BIT(2)
151 
152 /*
153  * SJA1000 private data structure
154  */
155 struct sja1000_priv {
156 	struct can_priv can;	/* must be the first member */
157 	struct sk_buff *echo_skb;
158 
159 	/* the lower-layer is responsible for appropriate locking */
160 	u8 (*read_reg) (const struct sja1000_priv *priv, int reg);
161 	void (*write_reg) (const struct sja1000_priv *priv, int reg, u8 val);
162 	void (*pre_irq) (const struct sja1000_priv *priv);
163 	void (*post_irq) (const struct sja1000_priv *priv);
164 
165 	void *priv;		/* for board-specific data */
166 	struct net_device *dev;
167 
168 	void __iomem *reg_base;	 /* ioremap'ed address to registers */
169 	unsigned long irq_flags; /* for request_irq() */
170 	spinlock_t cmdreg_lock;  /* lock for concurrent cmd register writes */
171 
172 	u16 flags;		/* custom mode flags */
173 	u8 ocr;			/* output control register */
174 	u8 cdr;			/* clock divider register */
175 };
176 
177 struct net_device *alloc_sja1000dev(int sizeof_priv);
178 void free_sja1000dev(struct net_device *dev);
179 int register_sja1000dev(struct net_device *dev);
180 void unregister_sja1000dev(struct net_device *dev);
181 
182 irqreturn_t sja1000_interrupt(int irq, void *dev_id);
183 
184 #endif /* SJA1000_DEV_H */
185