CRISv10 serial driver rewrite

/*

 * serial.h: Arch-dep definitions for the Etrax100 serial driver.

 *

 * Copyright (C) 1998-2007 Axis Communications AB

 */

#ifndef _ETRAX_SERIAL_H

#define _ETRAX_SERIAL_H

#include <linux/circ_buf.h>

#include <asm/termios.h>

#include <asm/dma.h>

#include <asm/arch/io_interface_mux.h>

/* Software state per channel */

#ifdef __KERNEL__

/*

 * This is our internal structure for each serial port's state.

 *

 * Many fields are paralleled by the structure used by the serial_struct

 * structure.

 *

 * For definitions of the flags field, see tty.h

 */

#define SERIAL_RECV_DESCRIPTORS 8

struct etrax_recv_buffer {

	struct etrax_recv_buffer *next;

	unsigned short length;

	unsigned char error;

	unsigned char pad;

	unsigned char buffer[0];

};

struct e100_serial {

	int baud;

	volatile u8	*port;	/* R_SERIALx_CTRL */

	u32		irq;	/* bitnr in R_IRQ_MASK2 for dmaX_descr */

	/* Output registers */

	volatile u8 *oclrintradr;	/* adr to R_DMA_CHx_CLR_INTR */

	volatile u32 *ofirstadr;	/* adr to R_DMA_CHx_FIRST */

	volatile u8 *ocmdadr;		/* adr to R_DMA_CHx_CMD */

	const volatile u8 *ostatusadr;	/* adr to R_DMA_CHx_STATUS */

	/* Input registers */

	volatile u8 *iclrintradr;	/* adr to R_DMA_CHx_CLR_INTR */

	volatile u32 *ifirstadr;	/* adr to R_DMA_CHx_FIRST */

	volatile u8 *icmdadr;		/* adr to R_DMA_CHx_CMD */

	volatile u32 *idescradr;	/* adr to R_DMA_CHx_DESCR */

	int flags;	/* defined in tty.h */

	u8 rx_ctrl;	/* shadow for R_SERIALx_REC_CTRL */

	u8 tx_ctrl;	/* shadow for R_SERIALx_TR_CTRL */

	u8 iseteop;	/* bit number for R_SET_EOP for the input dma */

	int enabled;	/* Set to 1 if the port is enabled in HW config */

	u8 dma_out_enabled;	/* Set to 1 if DMA should be used */

	u8 dma_in_enabled;	/* Set to 1 if DMA should be used */

	/* end of fields defined in rs_table[] in .c-file */

	int		dma_owner;

	unsigned int	dma_in_nbr;

	unsigned int	dma_out_nbr;

	unsigned int	dma_in_irq_nbr;

	unsigned int	dma_out_irq_nbr;

	unsigned long	dma_in_irq_flags;

	unsigned long	dma_out_irq_flags;

	char		*dma_in_irq_description;

	char		*dma_out_irq_description;

	enum cris_io_interface io_if;

	char            *io_if_description;

	u8		uses_dma_in;  /* Set to 1 if DMA is used */

	u8		uses_dma_out; /* Set to 1 if DMA is used */

	u8		forced_eop;   /* a fifo eop has been forced */

	int			baud_base;     /* For special baudrates */

	int			custom_divisor; /* For special baudrates */

	struct etrax_dma_descr	tr_descr;

	struct etrax_dma_descr	rec_descr[SERIAL_RECV_DESCRIPTORS];

	int			cur_rec_descr;

	volatile int		tr_running; /* 1 if output is running */

	struct tty_struct	*tty;

	int			read_status_mask;

	int			ignore_status_mask;

	int			x_char;	/* xon/xoff character */

	int			close_delay;

	unsigned short		closing_wait;

	unsigned short		closing_wait2;

	unsigned long		event;

	unsigned long		last_active;

	int			line;

	int			type;  /* PORT_ETRAX */

	int			count;	    /* # of fd on device */

	int			blocked_open; /* # of blocked opens */

	struct circ_buf		xmit;

	struct etrax_recv_buffer *first_recv_buffer;

	struct etrax_recv_buffer *last_recv_buffer;

	unsigned int		recv_cnt;

	unsigned int		max_recv_cnt;

	struct work_struct	work;

	struct async_icount	icount;   /* error-statistics etc.*/

	struct ktermios		normal_termios;

	struct ktermios		callout_termios;

	wait_queue_head_t	open_wait;

	wait_queue_head_t	close_wait;

	unsigned long char_time_usec;       /* The time for 1 char, in usecs */

	unsigned long flush_time_usec;      /* How often we should flush */

	unsigned long last_tx_active_usec;  /* Last tx usec in the jiffies */

	unsigned long last_tx_active;       /* Last tx time in jiffies */

	unsigned long last_rx_active_usec;  /* Last rx usec in the jiffies */

	unsigned long last_rx_active;       /* Last rx time in jiffies */

	int break_detected_cnt;

	int errorcode;

#ifdef CONFIG_ETRAX_RS485

	struct rs485_control	rs485;  /* RS-485 support */

#endif

};

/* this PORT is not in the standard serial.h. it's not actually used for

 * anything since we only have one type of async serial-port anyway in this

 * system.

 */

#define PORT_ETRAX 1

/*

 * Events are used to schedule things to happen at timer-interrupt

 * time, instead of at rs interrupt time.

 */

#define RS_EVENT_WRITE_WAKEUP	0

#endif /* __KERNEL__ */

#endif /* !_ETRAX_SERIAL_H */