drivers/serial/crisv10.h

   1 /*
   2  * serial.h: Arch-dep definitions for the Etrax100 serial driver.
   3  *
   4  * Copyright (C) 1998, 1999, 2000 Axis Communications AB
   5  */
   6
   7 #ifndef _ETRAX_SERIAL_H
   8 #define _ETRAX_SERIAL_H
   9
  10 #include <linux/config.h>
  11 #include <linux/circ_buf.h>
  12 #include <asm/termios.h>
  13
  14 /* Software state per channel */
  15
  16 #ifdef __KERNEL__
  17 /*
  18  * This is our internal structure for each serial port's state.
  19  *
  20  * Many fields are paralleled by the structure used by the serial_struct
  21  * structure.
  22  *
  23  * For definitions of the flags field, see tty.h
  24  */
  25
  26 #define SERIAL_RECV_DESCRIPTORS 8
  27
  28 struct etrax_recv_buffer {
  29         struct etrax_recv_buffer *next;
  30         unsigned short length;
  31         unsigned char error;
  32         unsigned char pad;
  33
  34         unsigned char buffer[0];
  35 };
  36
  37 struct e100_serial {
  38         int                     baud;
  39         volatile u8             *port; /* R_SERIALx_CTRL */
  40         u32                     irq;  /* bitnr in R_IRQ_MASK2 for dmaX_descr */
  41
  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
  48         /* Input registers */
  49         volatile u8             *iclrintradr; /* adr to R_DMA_CHx_CLR_INTR */
  50         volatile u32            *ifirstadr;   /* adr to R_DMA_CHx_FIRST */
  51         volatile u8             *icmdadr;     /* adr to R_DMA_CHx_CMD */
  52         volatile u32            *idescradr;   /* adr to R_DMA_CHx_DESCR */
  53
  54         int                     flags;  /* defined in tty.h */
  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:1; /* Set to 1 if DMA should be used */
  62         u8              dma_in_enabled:1;  /* Set to 1 if DMA should be used */
  63
  64         /* end of fields defined in rs_table[] in .c-file */
  65         u8              uses_dma_in;  /* Set to 1 if DMA is used */
  66         u8              uses_dma_out; /* Set to 1 if DMA is used */
  67         u8              forced_eop;   /* a fifo eop has been forced */
  68         int                     baud_base;     /* For special baudrates */
  69         int                     custom_divisor; /* For special baudrates */
  70         struct etrax_dma_descr  tr_descr;
  71         struct etrax_dma_descr  rec_descr[SERIAL_RECV_DESCRIPTORS];
  72         int                     cur_rec_descr;
  73
  74         volatile int            tr_running; /* 1 if output is running */
  75
  76         struct tty_struct       *tty;
  77         int                     read_status_mask;
  78         int                     ignore_status_mask;
  79         int                     x_char; /* xon/xoff character */
  80         int                     close_delay;
  81         unsigned short          closing_wait;
  82         unsigned short          closing_wait2;
  83         unsigned long           event;
  84         unsigned long           last_active;
  85         int                     line;
  86         int                     type;  /* PORT_ETRAX */
  87         int                     count;      /* # of fd on device */
  88         int                     blocked_open; /* # of blocked opens */
  89         struct circ_buf         xmit;
  90         struct etrax_recv_buffer *first_recv_buffer;
  91         struct etrax_recv_buffer *last_recv_buffer;
  92         unsigned int            recv_cnt;
  93         unsigned int            max_recv_cnt;
  94
  95         struct work_struct      work;
  96         struct async_icount     icount;   /* error-statistics etc.*/
  97         struct termios          normal_termios;
  98         struct termios          callout_termios;
  99 #ifdef DECLARE_WAITQUEUE
 100         wait_queue_head_t       open_wait;
 101         wait_queue_head_t       close_wait;
 102 #else
 103         struct wait_queue       *open_wait;
 104         struct wait_queue       *close_wait;
 105 #endif
 106
 107         unsigned long           char_time_usec;       /* The time for 1 char, in usecs */
 108         unsigned long           flush_time_usec;      /* How often we should flush */
 109         unsigned long           last_tx_active_usec;  /* Last tx usec in the jiffies */
 110         unsigned long           last_tx_active;       /* Last tx time in jiffies */
 111         unsigned long           last_rx_active_usec;  /* Last rx usec in the jiffies */
 112         unsigned long           last_rx_active;       /* Last rx time in jiffies */
 113
 114         int                     break_detected_cnt;
 115         int                     errorcode;
 116
 117 #ifdef CONFIG_ETRAX_RS485
 118         struct rs485_control    rs485;  /* RS-485 support */
 119 #endif
 120 };
 121
 122 /* this PORT is not in the standard serial.h. it's not actually used for
 123  * anything since we only have one type of async serial-port anyway in this
 124  * system.
 125  */
 126
 127 #define PORT_ETRAX 1
 128
 129 /*
 130  * Events are used to schedule things to happen at timer-interrupt
 131  * time, instead of at rs interrupt time.
 132  */
 133 #define RS_EVENT_WRITE_WAKEUP   0
 134
 135 #endif /* __KERNEL__ */
 136
 137 #endif /* !_ETRAX_SERIAL_H */