drivers/serial/crisv10.h

   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 <asm/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
  29 struct 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
  38 struct e100_serial {
  39         int baud;
  40         volatile u8     *port;  /* R_SERIALx_CTRL */
  41         u32             irq;    /* bitnr in R_IRQ_MASK2 for dmaX_descr */
  42
  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 */
  48
  49         /* Input registers */
  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 */
  54
  55         int flags;      /* defined in tty.h */
  56
  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 */
  61
  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 */
  64
  65         /* end of fields defined in rs_table[] in .c-file */
  66         int             dma_owner;
  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;
  75
  76         enum cris_io_interface io_if;
  77         char            *io_if_description;
  78
  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];
  86         int                     cur_rec_descr;
  87
  88         volatile int            tr_running; /* 1 if output is running */
  89
  90         struct tty_struct       *tty;
  91         int                     read_status_mask;
  92         int                     ignore_status_mask;
  93         int                     x_char; /* xon/xoff character */
  94         int                     close_delay;
  95         unsigned short          closing_wait;
  96         unsigned short          closing_wait2;
  97         unsigned long           event;
  98         unsigned long           last_active;
  99         int                     line;
 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;
 108
 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;
 115
 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 */
 122
 123         int break_detected_cnt;
 124         int errorcode;
 125
 126 #ifdef CONFIG_ETRAX_RS485
 127         struct rs485_control    rs485;  /* RS-485 support */
 128 #endif
 129 };
 130
 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
 133  * system.
 134  */
 135
 136 #define PORT_ETRAX 1
 137
 138 /*
 139  * Events are used to schedule things to happen at timer-interrupt
 140  * time, instead of at rs interrupt time.
 141  */
 142 #define RS_EVENT_WRITE_WAKEUP   0
 143
 144 #endif /* __KERNEL__ */
 145
 146 #endif /* !_ETRAX_SERIAL_H */