drivers/tty/serial/crisv10.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * serial.h: Arch-dep definitions for the Etrax100 serial driver.
   4  *
   5  * Copyright (C) 1998-2007 Axis Communications AB
   6  */
   7
   8 #ifndef _ETRAX_SERIAL_H
   9 #define _ETRAX_SERIAL_H
  10
  11 #include <linux/circ_buf.h>
  12 #include <asm/termios.h>
  13 #include <asm/dma.h>
  14 #include <arch/io_interface_mux.h>
  15
  16 /* Software state per channel */
  17
  18 #ifdef __KERNEL__
  19 /*
  20  * This is our internal structure for each serial port's state.
  21  *
  22  * Many fields are paralleled by the structure used by the serial_struct
  23  * structure.
  24  *
  25  * For definitions of the flags field, see tty.h
  26  */
  27
  28 #define SERIAL_RECV_DESCRIPTORS 8
  29
  30 struct etrax_recv_buffer {
  31         struct etrax_recv_buffer *next;
  32         unsigned short length;
  33         unsigned char error;
  34         unsigned char pad;
  35
  36         unsigned char buffer[0];
  37 };
  38
  39 struct e100_serial {
  40         struct tty_port port;
  41         int baud;
  42         volatile u8     *ioport;        /* R_SERIALx_CTRL */
  43         u32             irq;    /* bitnr in R_IRQ_MASK2 for dmaX_descr */
  44
  45         /* Output registers */
  46         volatile u8 *oclrintradr;       /* adr to R_DMA_CHx_CLR_INTR */
  47         volatile u32 *ofirstadr;        /* adr to R_DMA_CHx_FIRST */
  48         volatile u8 *ocmdadr;           /* adr to R_DMA_CHx_CMD */
  49         const volatile u8 *ostatusadr;  /* adr to R_DMA_CHx_STATUS */
  50
  51         /* Input registers */
  52         volatile u8 *iclrintradr;       /* adr to R_DMA_CHx_CLR_INTR */
  53         volatile u32 *ifirstadr;        /* adr to R_DMA_CHx_FIRST */
  54         volatile u8 *icmdadr;           /* adr to R_DMA_CHx_CMD */
  55         volatile u32 *idescradr;        /* adr to R_DMA_CHx_DESCR */
  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         int                     x_char; /* xon/xoff character */
  91         unsigned long           event;
  92         int                     line;
  93         int                     type;  /* PORT_ETRAX */
  94         struct circ_buf         xmit;
  95         struct etrax_recv_buffer *first_recv_buffer;
  96         struct etrax_recv_buffer *last_recv_buffer;
  97         unsigned int            recv_cnt;
  98         unsigned int            max_recv_cnt;
  99
 100         struct work_struct      work;
 101         struct async_icount     icount;   /* error-statistics etc.*/
 102
 103         unsigned long char_time_usec;       /* The time for 1 char, in usecs */
 104         unsigned long flush_time_usec;      /* How often we should flush */
 105         unsigned long last_tx_active_usec;  /* Last tx usec in the jiffies */
 106         unsigned long last_tx_active;       /* Last tx time in jiffies */
 107         unsigned long last_rx_active_usec;  /* Last rx usec in the jiffies */
 108         unsigned long last_rx_active;       /* Last rx time in jiffies */
 109
 110         int break_detected_cnt;
 111         int errorcode;
 112
 113 #ifdef CONFIG_ETRAX_RS485
 114         struct serial_rs485     rs485;  /* RS-485 support */
 115 #endif
 116 };
 117
 118 /* this PORT is not in the standard serial.h. it's not actually used for
 119  * anything since we only have one type of async serial-port anyway in this
 120  * system.
 121  */
 122
 123 #define PORT_ETRAX 1
 124
 125 /*
 126  * Events are used to schedule things to happen at timer-interrupt
 127  * time, instead of at rs interrupt time.
 128  */
 129 #define RS_EVENT_WRITE_WAKEUP   0
 130
 131 #endif /* __KERNEL__ */
 132
 133 #endif /* !_ETRAX_SERIAL_H */