2 * serial.h: Arch-dep definitions for the Etrax100 serial driver.
4 * Copyright (C) 1998-2007 Axis Communications AB
7 #ifndef _ETRAX_SERIAL_H
8 #define _ETRAX_SERIAL_H
10 #include <linux/circ_buf.h>
11 #include <asm/termios.h>
13 #include <asm/arch/io_interface_mux.h>
15 /* Software state per channel */
19 * This is our internal structure for each serial port's state.
21 * Many fields are paralleled by the structure used by the serial_struct
24 * For definitions of the flags field, see tty.h
27 #define SERIAL_RECV_DESCRIPTORS 8
29 struct etrax_recv_buffer {
30 struct etrax_recv_buffer *next;
31 unsigned short length;
35 unsigned char buffer[0];
40 volatile u8 *port; /* R_SERIALx_CTRL */
41 u32 irq; /* bitnr in R_IRQ_MASK2 for dmaX_descr */
43 /* Output registers */
44 volatile u8 *oclrintradr; /* adr to R_DMA_CHx_CLR_INTR */
45 volatile u32 *ofirstadr; /* adr to R_DMA_CHx_FIRST */
46 volatile u8 *ocmdadr; /* adr to R_DMA_CHx_CMD */
47 const volatile u8 *ostatusadr; /* adr to R_DMA_CHx_STATUS */
50 volatile u8 *iclrintradr; /* adr to R_DMA_CHx_CLR_INTR */
51 volatile u32 *ifirstadr; /* adr to R_DMA_CHx_FIRST */
52 volatile u8 *icmdadr; /* adr to R_DMA_CHx_CMD */
53 volatile u32 *idescradr; /* adr to R_DMA_CHx_DESCR */
55 int flags; /* defined in tty.h */
57 u8 rx_ctrl; /* shadow for R_SERIALx_REC_CTRL */
58 u8 tx_ctrl; /* shadow for R_SERIALx_TR_CTRL */
59 u8 iseteop; /* bit number for R_SET_EOP for the input dma */
60 int enabled; /* Set to 1 if the port is enabled in HW config */
62 u8 dma_out_enabled; /* Set to 1 if DMA should be used */
63 u8 dma_in_enabled; /* Set to 1 if DMA should be used */
65 /* end of fields defined in rs_table[] in .c-file */
67 unsigned int dma_in_nbr;
68 unsigned int dma_out_nbr;
69 unsigned int dma_in_irq_nbr;
70 unsigned int dma_out_irq_nbr;
71 unsigned long dma_in_irq_flags;
72 unsigned long dma_out_irq_flags;
73 char *dma_in_irq_description;
74 char *dma_out_irq_description;
76 enum cris_io_interface io_if;
77 char *io_if_description;
79 u8 uses_dma_in; /* Set to 1 if DMA is used */
80 u8 uses_dma_out; /* Set to 1 if DMA is used */
81 u8 forced_eop; /* a fifo eop has been forced */
82 int baud_base; /* For special baudrates */
83 int custom_divisor; /* For special baudrates */
84 struct etrax_dma_descr tr_descr;
85 struct etrax_dma_descr rec_descr[SERIAL_RECV_DESCRIPTORS];
88 volatile int tr_running; /* 1 if output is running */
90 struct tty_struct *tty;
92 int ignore_status_mask;
93 int x_char; /* xon/xoff character */
95 unsigned short closing_wait;
96 unsigned short closing_wait2;
98 unsigned long last_active;
100 int type; /* PORT_ETRAX */
101 int count; /* # of fd on device */
102 int blocked_open; /* # of blocked opens */
103 struct circ_buf xmit;
104 struct etrax_recv_buffer *first_recv_buffer;
105 struct etrax_recv_buffer *last_recv_buffer;
106 unsigned int recv_cnt;
107 unsigned int max_recv_cnt;
109 struct work_struct work;
110 struct async_icount icount; /* error-statistics etc.*/
111 struct ktermios normal_termios;
112 struct ktermios callout_termios;
113 wait_queue_head_t open_wait;
114 wait_queue_head_t close_wait;
116 unsigned long char_time_usec; /* The time for 1 char, in usecs */
117 unsigned long flush_time_usec; /* How often we should flush */
118 unsigned long last_tx_active_usec; /* Last tx usec in the jiffies */
119 unsigned long last_tx_active; /* Last tx time in jiffies */
120 unsigned long last_rx_active_usec; /* Last rx usec in the jiffies */
121 unsigned long last_rx_active; /* Last rx time in jiffies */
123 int break_detected_cnt;
126 #ifdef CONFIG_ETRAX_RS485
127 struct rs485_control rs485; /* RS-485 support */
131 /* this PORT is not in the standard serial.h. it's not actually used for
132 * anything since we only have one type of async serial-port anyway in this
139 * Events are used to schedule things to happen at timer-interrupt
140 * time, instead of at rs interrupt time.
142 #define RS_EVENT_WRITE_WAKEUP 0
144 #endif /* __KERNEL__ */
146 #endif /* !_ETRAX_SERIAL_H */