drivers/net/can/sja1000/sja1000.h

   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  * Send feedback to <socketcan-users@lists.berlios.de>
  44  *
  45  */
  46
  47 #ifndef SJA1000_DEV_H
  48 #define SJA1000_DEV_H
  49
  50 #include <linux/irqreturn.h>
  51 #include <linux/can/dev.h>
  52 #include <linux/can/platform/sja1000.h>
  53
  54 #define SJA1000_ECHO_SKB_MAX    1 /* the SJA1000 has one TX buffer object */
  55
  56 #define SJA1000_MAX_IRQ 20      /* max. number of interrupts handled in ISR */
  57
  58 /* SJA1000 registers - manual section 6.4 (Pelican Mode) */
  59 #define REG_MOD         0x00
  60 #define REG_CMR         0x01
  61 #define REG_SR          0x02
  62 #define REG_IR          0x03
  63 #define REG_IER         0x04
  64 #define REG_ALC         0x0B
  65 #define REG_ECC         0x0C
  66 #define REG_EWL         0x0D
  67 #define REG_RXERR       0x0E
  68 #define REG_TXERR       0x0F
  69 #define REG_ACCC0       0x10
  70 #define REG_ACCC1       0x11
  71 #define REG_ACCC2       0x12
  72 #define REG_ACCC3       0x13
  73 #define REG_ACCM0       0x14
  74 #define REG_ACCM1       0x15
  75 #define REG_ACCM2       0x16
  76 #define REG_ACCM3       0x17
  77 #define REG_RMC         0x1D
  78 #define REG_RBSA        0x1E
  79
  80 /* Common registers - manual section 6.5 */
  81 #define REG_BTR0        0x06
  82 #define REG_BTR1        0x07
  83 #define REG_OCR         0x08
  84 #define REG_CDR         0x1F
  85
  86 #define REG_FI          0x10
  87 #define SFF_BUF         0x13
  88 #define EFF_BUF         0x15
  89
  90 #define FI_FF           0x80
  91 #define FI_RTR          0x40
  92
  93 #define REG_ID1         0x11
  94 #define REG_ID2         0x12
  95 #define REG_ID3         0x13
  96 #define REG_ID4         0x14
  97
  98 #define CAN_RAM         0x20
  99
 100 /* mode register */
 101 #define MOD_RM          0x01
 102 #define MOD_LOM         0x02
 103 #define MOD_STM         0x04
 104 #define MOD_AFM         0x08
 105 #define MOD_SM          0x10
 106
 107 /* commands */
 108 #define CMD_SRR         0x10
 109 #define CMD_CDO         0x08
 110 #define CMD_RRB         0x04
 111 #define CMD_AT          0x02
 112 #define CMD_TR          0x01
 113
 114 /* interrupt sources */
 115 #define IRQ_BEI         0x80
 116 #define IRQ_ALI         0x40
 117 #define IRQ_EPI         0x20
 118 #define IRQ_WUI         0x10
 119 #define IRQ_DOI         0x08
 120 #define IRQ_EI          0x04
 121 #define IRQ_TI          0x02
 122 #define IRQ_RI          0x01
 123 #define IRQ_ALL         0xFF
 124 #define IRQ_OFF         0x00
 125
 126 /* status register content */
 127 #define SR_BS           0x80
 128 #define SR_ES           0x40
 129 #define SR_TS           0x20
 130 #define SR_RS           0x10
 131 #define SR_TCS          0x08
 132 #define SR_TBS          0x04
 133 #define SR_DOS          0x02
 134 #define SR_RBS          0x01
 135
 136 #define SR_CRIT (SR_BS|SR_ES)
 137
 138 /* ECC register */
 139 #define ECC_SEG         0x1F
 140 #define ECC_DIR         0x20
 141 #define ECC_ERR         6
 142 #define ECC_BIT         0x00
 143 #define ECC_FORM        0x40
 144 #define ECC_STUFF       0x80
 145 #define ECC_MASK        0xc0
 146
 147 /*
 148  * Flags for sja1000priv.flags
 149  */
 150 #define SJA1000_CUSTOM_IRQ_HANDLER 0x1
 151
 152 /*
 153  * SJA1000 private data structure
 154  */
 155 struct sja1000_priv {
 156         struct can_priv can;    /* must be the first member */
 157         int open_time;
 158         struct sk_buff *echo_skb;
 159
 160         /* the lower-layer is responsible for appropriate locking */
 161         u8 (*read_reg) (const struct sja1000_priv *priv, int reg);
 162         void (*write_reg) (const struct sja1000_priv *priv, int reg, u8 val);
 163         void (*pre_irq) (const struct sja1000_priv *priv);
 164         void (*post_irq) (const struct sja1000_priv *priv);
 165
 166         void *priv;             /* for board-specific data */
 167         struct net_device *dev;
 168
 169         void __iomem *reg_base;  /* ioremap'ed address to registers */
 170         unsigned long irq_flags; /* for request_irq() */
 171         spinlock_t cmdreg_lock;  /* lock for concurrent cmd register writes */
 172
 173         u16 flags;              /* custom mode flags */
 174         u8 ocr;                 /* output control register */
 175         u8 cdr;                 /* clock divider register */
 176 };
 177
 178 struct net_device *alloc_sja1000dev(int sizeof_priv);
 179 void free_sja1000dev(struct net_device *dev);
 180 int register_sja1000dev(struct net_device *dev);
 181 void unregister_sja1000dev(struct net_device *dev);
 182
 183 irqreturn_t sja1000_interrupt(int irq, void *dev_id);
 184
 185 #endif /* SJA1000_DEV_H */