2 * serial.h: Arch-dep definitions for the Etrax100 serial driver.
4 * Copyright (C) 1998, 1999, 2000 Axis Communications AB
7 #ifndef _ETRAX_SERIAL_H
8 #define _ETRAX_SERIAL_H
10 #include <linux/config.h>
11 #include <linux/circ_buf.h>
12 #include <asm/termios.h>
14 /* Software state per channel */
18 * This is our internal structure for each serial port's state.
20 * Many fields are paralleled by the structure used by the serial_struct
23 * For definitions of the flags field, see tty.h
26 #define SERIAL_RECV_DESCRIPTORS 8
28 struct etrax_recv_buffer {
29 struct etrax_recv_buffer *next;
30 unsigned short length;
34 unsigned char buffer[0];
39 volatile u8 *port; /* R_SERIALx_CTRL */
40 u32 irq; /* bitnr in R_IRQ_MASK2 for dmaX_descr */
42 /* Output registers */
43 volatile u8 *oclrintradr; /* adr to R_DMA_CHx_CLR_INTR */
44 volatile u32 *ofirstadr; /* adr to R_DMA_CHx_FIRST */
45 volatile u8 *ocmdadr; /* adr to R_DMA_CHx_CMD */
46 const volatile u8 *ostatusadr; /* adr to R_DMA_CHx_STATUS */
47 volatile u32 *ohwswadr; /* adr to R_DMA_CHx_HWSW */
48 volatile u32 *odescradr; /* adr to R_DMA_CHx_DESCR */
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 const volatile u8 *istatusadr; /* adr to R_DMA_CHx_STATUS */
55 volatile u32 *ihwswadr; /* adr to R_DMA_CHx_HWSW */
56 volatile u32 *idescradr; /* adr to R_DMA_CHx_DESCR */
58 int flags; /* defined in tty.h */
60 u8 rx_ctrl; /* shadow for R_SERIALx_REC_CTRL */
61 u8 tx_ctrl; /* shadow for R_SERIALx_TR_CTRL */
62 u8 iseteop; /* bit number for R_SET_EOP for the input dma */
64 int enabled; /* Set to 1 if the port is enabled in HW config */
66 /* end of fields defined in rs_table[] in .c-file */
68 int uses_dma; /* Set to 1 if DMA should be used */
69 unsigned char forced_eop; /* a fifo eop has been forced */
71 struct etrax_dma_descr tr_descr;
72 struct etrax_dma_descr rec_descr[SERIAL_RECV_DESCRIPTORS];
75 volatile int tr_running; /* 1 if output is running */
77 struct tty_struct *tty;
79 int ignore_status_mask;
80 int x_char; /* xon/xoff character */
82 unsigned short closing_wait;
83 unsigned short closing_wait2;
85 unsigned long last_active;
87 int type; /* PORT_ETRAX */
88 int count; /* # of fd on device */
89 int blocked_open; /* # of blocked opens */
91 struct etrax_recv_buffer *first_recv_buffer;
92 struct etrax_recv_buffer *last_recv_buffer;
93 unsigned int recv_cnt;
94 unsigned int max_recv_cnt;
96 struct work_struct work;
97 struct async_icount icount; /* error-statistics etc.*/
98 #ifdef DECLARE_WAITQUEUE
99 wait_queue_head_t open_wait;
100 wait_queue_head_t close_wait;
102 struct wait_queue *open_wait;
103 struct wait_queue *close_wait;
106 unsigned long char_time_usec; /* The time for 1 char, in usecs */
107 unsigned long last_tx_active_usec; /* Last tx usec in the jiffies */
108 unsigned long last_tx_active; /* Last tx time in jiffies */
109 unsigned long last_rx_active_usec; /* Last rx usec in the jiffies */
110 unsigned long last_rx_active; /* Last rx time in jiffies */
112 int break_detected_cnt;
115 #ifdef CONFIG_ETRAX_RS485
116 struct rs485_control rs485; /* RS-485 support */
120 /* this PORT is not in the standard serial.h. it's not actually used for
121 * anything since we only have one type of async serial-port anyway in this
128 * Events are used to schedule things to happen at timer-interrupt
129 * time, instead of at rs interrupt time.
131 #define RS_EVENT_WRITE_WAKEUP 0
133 #endif /* __KERNEL__ */
135 #endif /* !_ETRAX_SERIAL_H */