204 lines
6.4 KiB
C
204 lines
6.4 KiB
C
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/*
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* Core driver for the CC770 and AN82527 CAN controllers
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*
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* Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the version 2 of the GNU General Public License
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef CC770_DEV_H
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#define CC770_DEV_H
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#include <linux/can/dev.h>
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struct cc770_msgobj {
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u8 ctrl0;
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u8 ctrl1;
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u8 id[4];
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u8 config;
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u8 data[8];
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u8 dontuse; /* padding */
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} __packed;
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struct cc770_regs {
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union {
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struct cc770_msgobj msgobj[16]; /* Message object 1..15 */
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struct {
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u8 control; /* Control Register */
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u8 status; /* Status Register */
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u8 cpu_interface; /* CPU Interface Register */
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u8 dontuse1;
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u8 high_speed_read[2]; /* High Speed Read */
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u8 global_mask_std[2]; /* Standard Global Mask */
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u8 global_mask_ext[4]; /* Extended Global Mask */
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u8 msg15_mask[4]; /* Message 15 Mask */
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u8 dontuse2[15];
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u8 clkout; /* Clock Out Register */
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u8 dontuse3[15];
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u8 bus_config; /* Bus Configuration Register */
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u8 dontuse4[15];
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u8 bit_timing_0; /* Bit Timing Register byte 0 */
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u8 dontuse5[15];
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u8 bit_timing_1; /* Bit Timing Register byte 1 */
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u8 dontuse6[15];
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u8 interrupt; /* Interrupt Register */
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u8 dontuse7[15];
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u8 rx_error_counter; /* Receive Error Counter */
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u8 dontuse8[15];
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u8 tx_error_counter; /* Transmit Error Counter */
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u8 dontuse9[31];
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u8 p1_conf;
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u8 dontuse10[15];
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u8 p2_conf;
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u8 dontuse11[15];
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u8 p1_in;
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u8 dontuse12[15];
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u8 p2_in;
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u8 dontuse13[15];
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u8 p1_out;
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u8 dontuse14[15];
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u8 p2_out;
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u8 dontuse15[15];
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u8 serial_reset_addr;
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};
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};
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} __packed;
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/* Control Register (0x00) */
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#define CTRL_INI 0x01 /* Initialization */
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#define CTRL_IE 0x02 /* Interrupt Enable */
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#define CTRL_SIE 0x04 /* Status Interrupt Enable */
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#define CTRL_EIE 0x08 /* Error Interrupt Enable */
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#define CTRL_EAF 0x20 /* Enable additional functions */
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#define CTRL_CCE 0x40 /* Change Configuration Enable */
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/* Status Register (0x01) */
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#define STAT_LEC_STUFF 0x01 /* Stuff error */
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#define STAT_LEC_FORM 0x02 /* Form error */
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#define STAT_LEC_ACK 0x03 /* Acknowledgement error */
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#define STAT_LEC_BIT1 0x04 /* Bit1 error */
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#define STAT_LEC_BIT0 0x05 /* Bit0 error */
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#define STAT_LEC_CRC 0x06 /* CRC error */
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#define STAT_LEC_MASK 0x07 /* Last Error Code mask */
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#define STAT_TXOK 0x08 /* Transmit Message Successfully */
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#define STAT_RXOK 0x10 /* Receive Message Successfully */
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#define STAT_WAKE 0x20 /* Wake Up Status */
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#define STAT_WARN 0x40 /* Warning Status */
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#define STAT_BOFF 0x80 /* Bus Off Status */
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/*
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* CPU Interface Register (0x02)
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* Clock Out Register (0x1f)
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* Bus Configuration Register (0x2f)
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*
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* see include/linux/can/platform/cc770.h
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*/
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/* Message Control Register 0 (Base Address + 0x0) */
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#define INTPND_RES 0x01 /* No Interrupt pending */
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#define INTPND_SET 0x02 /* Interrupt pending */
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#define INTPND_UNC 0x03
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#define RXIE_RES 0x04 /* Receive Interrupt Disable */
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#define RXIE_SET 0x08 /* Receive Interrupt Enable */
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#define RXIE_UNC 0x0c
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#define TXIE_RES 0x10 /* Transmit Interrupt Disable */
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#define TXIE_SET 0x20 /* Transmit Interrupt Enable */
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#define TXIE_UNC 0x30
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#define MSGVAL_RES 0x40 /* Message Invalid */
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#define MSGVAL_SET 0x80 /* Message Valid */
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#define MSGVAL_UNC 0xc0
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/* Message Control Register 1 (Base Address + 0x01) */
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#define NEWDAT_RES 0x01 /* No New Data */
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#define NEWDAT_SET 0x02 /* New Data */
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#define NEWDAT_UNC 0x03
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#define MSGLST_RES 0x04 /* No Message Lost */
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#define MSGLST_SET 0x08 /* Message Lost */
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#define MSGLST_UNC 0x0c
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#define CPUUPD_RES 0x04 /* No CPU Updating */
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#define CPUUPD_SET 0x08 /* CPU Updating */
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#define CPUUPD_UNC 0x0c
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#define TXRQST_RES 0x10 /* No Transmission Request */
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#define TXRQST_SET 0x20 /* Transmission Request */
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#define TXRQST_UNC 0x30
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#define RMTPND_RES 0x40 /* No Remote Request Pending */
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#define RMTPND_SET 0x80 /* Remote Request Pending */
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#define RMTPND_UNC 0xc0
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/* Message Configuration Register (Base Address + 0x06) */
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#define MSGCFG_XTD 0x04 /* Extended Identifier */
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#define MSGCFG_DIR 0x08 /* Direction is Transmit */
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#define MSGOBJ_FIRST 1
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#define MSGOBJ_LAST 15
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#define CC770_IO_SIZE 0x100
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#define CC770_MAX_IRQ 20 /* max. number of interrupts handled in ISR */
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#define CC770_MAX_MSG 4 /* max. number of messages handled in ISR */
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#define CC770_ECHO_SKB_MAX 1
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#define cc770_read_reg(priv, member) \
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priv->read_reg(priv, offsetof(struct cc770_regs, member))
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#define cc770_write_reg(priv, member, value) \
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priv->write_reg(priv, offsetof(struct cc770_regs, member), value)
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/*
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* Message objects and flags used by this driver
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*/
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#define CC770_OBJ_FLAG_RX 0x01
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#define CC770_OBJ_FLAG_RTR 0x02
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#define CC770_OBJ_FLAG_EFF 0x04
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enum {
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CC770_OBJ_RX0 = 0, /* for receiving normal messages */
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CC770_OBJ_RX1, /* for receiving normal messages */
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CC770_OBJ_RX_RTR0, /* for receiving remote transmission requests */
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CC770_OBJ_RX_RTR1, /* for receiving remote transmission requests */
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CC770_OBJ_TX, /* for sending messages */
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CC770_OBJ_MAX
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};
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#define obj2msgobj(o) (MSGOBJ_LAST - (o)) /* message object 11..15 */
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/*
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* CC770 private data structure
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*/
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struct cc770_priv {
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struct can_priv can; /* must be the first member */
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struct sk_buff *echo_skb;
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/* the lower-layer is responsible for appropriate locking */
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u8 (*read_reg)(const struct cc770_priv *priv, int reg);
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void (*write_reg)(const struct cc770_priv *priv, int reg, u8 val);
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void (*pre_irq)(const struct cc770_priv *priv);
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void (*post_irq)(const struct cc770_priv *priv);
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void *priv; /* for board-specific data */
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struct net_device *dev;
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void __iomem *reg_base; /* ioremap'ed address to registers */
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unsigned long irq_flags; /* for request_irq() */
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unsigned char obj_flags[CC770_OBJ_MAX];
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u8 control_normal_mode; /* Control register for normal mode */
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u8 cpu_interface; /* CPU interface register */
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u8 clkout; /* Clock out register */
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u8 bus_config; /* Bus conffiguration register */
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};
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struct net_device *alloc_cc770dev(int sizeof_priv);
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void free_cc770dev(struct net_device *dev);
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int register_cc770dev(struct net_device *dev);
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void unregister_cc770dev(struct net_device *dev);
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#endif /* CC770_DEV_H */
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