1/*
  2 * serial.h: Arch-dep definitions for the Etrax100 serial driver.
  3 *
  4 * Copyright (C) 1998-2007 Axis Communications AB
  5 */
  6
  7#ifndef _ETRAX_SERIAL_H
  8#define _ETRAX_SERIAL_H
  9
 10#include <linux/circ_buf.h>
 11#include <asm/termios.h>
 12#include <asm/dma.h>
 13#include <arch/io_interface_mux.h>
 14
 15/* Software state per channel */
 16
 17#ifdef __KERNEL__
 18/*
 19 * This is our internal structure for each serial port's state.
 20 *
 21 * Many fields are paralleled by the structure used by the serial_struct
 22 * structure.
 23 *
 24 * For definitions of the flags field, see tty.h
 25 */
 26
 27#define SERIAL_RECV_DESCRIPTORS 8
 28
 29struct etrax_recv_buffer {
 30	struct etrax_recv_buffer *next;
 31	unsigned short length;
 32	unsigned char error;
 33	unsigned char pad;
 34
 35	unsigned char buffer[0];
 36};
 37
 38struct e100_serial {
 39	struct tty_port port;
 40	int baud;
 41	volatile u8	*ioport;	/* R_SERIALx_CTRL */
 42	u32		irq;	/* bitnr in R_IRQ_MASK2 for dmaX_descr */
 43
 44	/* Output registers */
 45	volatile u8 *oclrintradr;	/* adr to R_DMA_CHx_CLR_INTR */
 46	volatile u32 *ofirstadr;	/* adr to R_DMA_CHx_FIRST */
 47	volatile u8 *ocmdadr;		/* adr to R_DMA_CHx_CMD */
 48	const volatile u8 *ostatusadr;	/* adr to R_DMA_CHx_STATUS */
 49
 50	/* Input registers */
 51	volatile u8 *iclrintradr;	/* adr to R_DMA_CHx_CLR_INTR */
 52	volatile u32 *ifirstadr;	/* adr to R_DMA_CHx_FIRST */
 53	volatile u8 *icmdadr;		/* adr to R_DMA_CHx_CMD */
 54	volatile u32 *idescradr;	/* adr to R_DMA_CHx_DESCR */
 55
 56	u8 rx_ctrl;	/* shadow for R_SERIALx_REC_CTRL */
 57	u8 tx_ctrl;	/* shadow for R_SERIALx_TR_CTRL */
 58	u8 iseteop;	/* bit number for R_SET_EOP for the input dma */
 59	int enabled;	/* Set to 1 if the port is enabled in HW config */
 60
 61	u8 dma_out_enabled;	/* Set to 1 if DMA should be used */
 62	u8 dma_in_enabled;	/* Set to 1 if DMA should be used */
 63
 64	/* end of fields defined in rs_table[] in .c-file */
 65	int		dma_owner;
 66	unsigned int	dma_in_nbr;
 67	unsigned int	dma_out_nbr;
 68	unsigned int	dma_in_irq_nbr;
 69	unsigned int	dma_out_irq_nbr;
 70	unsigned long	dma_in_irq_flags;
 71	unsigned long	dma_out_irq_flags;
 72	char		*dma_in_irq_description;
 73	char		*dma_out_irq_description;
 74
 75	enum cris_io_interface io_if;
 76	char            *io_if_description;
 77
 78	u8		uses_dma_in;  /* Set to 1 if DMA is used */
 79	u8		uses_dma_out; /* Set to 1 if DMA is used */
 80	u8		forced_eop;   /* a fifo eop has been forced */
 81	int			baud_base;     /* For special baudrates */
 82	int			custom_divisor; /* For special baudrates */
 83	struct etrax_dma_descr	tr_descr;
 84	struct etrax_dma_descr	rec_descr[SERIAL_RECV_DESCRIPTORS];
 85	int			cur_rec_descr;
 86
 87	volatile int		tr_running; /* 1 if output is running */
 88
 89	int			x_char;	/* xon/xoff character */
 90	unsigned long		event;
 91	int			line;
 92	int			type;  /* PORT_ETRAX */
 93	struct circ_buf		xmit;
 94	struct etrax_recv_buffer *first_recv_buffer;
 95	struct etrax_recv_buffer *last_recv_buffer;
 96	unsigned int		recv_cnt;
 97	unsigned int		max_recv_cnt;
 98
 99	struct work_struct	work;
100	struct async_icount	icount;   /* error-statistics etc.*/
101	struct ktermios		normal_termios;
102
103	unsigned long char_time_usec;       /* The time for 1 char, in usecs */
104	unsigned long flush_time_usec;      /* How often we should flush */
105	unsigned long last_tx_active_usec;  /* Last tx usec in the jiffies */
106	unsigned long last_tx_active;       /* Last tx time in jiffies */
107	unsigned long last_rx_active_usec;  /* Last rx usec in the jiffies */
108	unsigned long last_rx_active;       /* Last rx time in jiffies */
109
110	int break_detected_cnt;
111	int errorcode;
112
113#ifdef CONFIG_ETRAX_RS485
114	struct serial_rs485	rs485;  /* RS-485 support */
115#endif
116};
117
118/* this PORT is not in the standard serial.h. it's not actually used for
119 * anything since we only have one type of async serial-port anyway in this
120 * system.
121 */
122
123#define PORT_ETRAX 1
124
125/*
126 * Events are used to schedule things to happen at timer-interrupt
127 * time, instead of at rs interrupt time.
128 */
129#define RS_EVENT_WRITE_WAKEUP	0
130
131#endif /* __KERNEL__ */
132
133#endif /* !_ETRAX_SERIAL_H */