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
102	unsigned long char_time_usec;       /* The time for 1 char, in usecs */
103	unsigned long flush_time_usec;      /* How often we should flush */
104	unsigned long last_tx_active_usec;  /* Last tx usec in the jiffies */
105	unsigned long last_tx_active;       /* Last tx time in jiffies */
106	unsigned long last_rx_active_usec;  /* Last rx usec in the jiffies */
107	unsigned long last_rx_active;       /* Last rx time in jiffies */
108
109	int break_detected_cnt;
110	int errorcode;
111
112#ifdef CONFIG_ETRAX_RS485
113	struct serial_rs485	rs485;  /* RS-485 support */
114#endif
115};
116
117/* this PORT is not in the standard serial.h. it's not actually used for
118 * anything since we only have one type of async serial-port anyway in this
119 * system.
120 */
121
122#define PORT_ETRAX 1
123
124/*
125 * Events are used to schedule things to happen at timer-interrupt
126 * time, instead of at rs interrupt time.
127 */
128#define RS_EVENT_WRITE_WAKEUP	0
129
130#endif /* __KERNEL__ */
131
132#endif /* !_ETRAX_SERIAL_H */
133