drivers/tty/serial/68328serial.h

   1 /* 68328serial.h: Definitions for the mc68328 serial driver.
   2  *
   3  * Copyright (C) 1995       David S. Miller    <davem@caip.rutgers.edu>
   4  * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
   5  * Copyright (C) 1998, 1999 D. Jeff Dionne     <jeff@uclinux.org>
   6  * Copyright (C) 1999       Vladimir Gurevich  <vgurevic@cisco.com>
   7  *
   8  * VZ Support/Fixes             Evan Stawnyczy <e@lineo.ca>
   9  */
  10
  11 #ifndef _MC683XX_SERIAL_H
  12 #define _MC683XX_SERIAL_H
  13
  14
  15 struct serial_struct {
  16         int     type;
  17         int     line;
  18         int     port;
  19         int     irq;
  20         int     flags;
  21         int     xmit_fifo_size;
  22         int     custom_divisor;
  23         int     baud_base;
  24         unsigned short  close_delay;
  25         char    reserved_char[2];
  26         int     hub6;  /* FIXME: We don't have AT&T Hub6 boards! */
  27         unsigned short  closing_wait; /* time to wait before closing */
  28         unsigned short  closing_wait2; /* no longer used... */
  29         int     reserved[4];
  30 };
  31
  32 /*
  33  * For the close wait times, 0 means wait forever for serial port to
  34  * flush its output.  65535 means don't wait at all.
  35  */
  36 #define S_CLOSING_WAIT_INF      0
  37 #define S_CLOSING_WAIT_NONE     65535
  38
  39 /*
  40  * Definitions for S_struct (and serial_struct) flags field
  41  */
  42 #define S_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes
  43                                    on the callout port */
  44 #define S_FOURPORT  0x0002      /* Set OU1, OUT2 per AST Fourport settings */
  45 #define S_SAK   0x0004  /* Secure Attention Key (Orange book) */
  46 #define S_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */
  47
  48 #define S_SPD_MASK      0x0030
  49 #define S_SPD_HI        0x0010  /* Use 56000 instead of 38400 bps */
  50
  51 #define S_SPD_VHI       0x0020  /* Use 115200 instead of 38400 bps */
  52 #define S_SPD_CUST      0x0030  /* Use user-specified divisor */
  53
  54 #define S_SKIP_TEST     0x0040 /* Skip UART test during autoconfiguration */
  55 #define S_AUTO_IRQ  0x0080 /* Do automatic IRQ during autoconfiguration */
  56 #define S_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
  57 #define S_PGRP_LOCKOUT    0x0200 /* Lock out cua opens based on pgrp */
  58 #define S_CALLOUT_NOHUP   0x0400 /* Don't do hangups for cua device */
  59
  60 #define S_FLAGS 0x0FFF  /* Possible legal S flags */
  61 #define S_USR_MASK 0x0430       /* Legal flags that non-privileged
  62                                  * users can set or reset */
  63
  64 /* Internal flags used only by kernel/chr_drv/serial.c */
  65 #define S_INITIALIZED   0x80000000 /* Serial port was initialized */
  66 #define S_CALLOUT_ACTIVE        0x40000000 /* Call out device is active */
  67 #define S_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
  68 #define S_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */
  69 #define S_CLOSING               0x08000000 /* Serial port is closing */
  70 #define S_CTS_FLOW              0x04000000 /* Do CTS flow control */
  71 #define S_CHECK_CD              0x02000000 /* i.e., CLOCAL */
  72
  73 /* Software state per channel */
  74
  75 #ifdef __KERNEL__
  76
  77 /*
  78  * I believe this is the optimal setting that reduces the number of interrupts.
  79  * At high speeds the output might become a little "bursted" (use USTCNT_TXHE
  80  * if that bothers you), but in most cases it will not, since we try to
  81  * transmit characters every time rs_interrupt is called. Thus, quite often
  82  * you'll see that a receive interrupt occures before the transmit one.
  83  *                                  -- Vladimir Gurevich
  84  */
  85 #define USTCNT_TX_INTR_MASK (USTCNT_TXEE)
  86
  87 /*
  88  * 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special
  89  * "Old data interrupt" which occures whenever the data stay in the FIFO
  90  * longer than 30 bits time. This allows us to use FIFO without compromising
  91  * latency. '328 does not have this feature and without the real  328-based
  92  * board I would assume that RXRE is the safest setting.
  93  *
  94  * For EZ328 I use RXHE (Half empty) interrupt to reduce the number of
  95  * interrupts. RXFE (receive queue full) causes the system to lose data
  96  * at least at 115200 baud
  97  *
  98  * If your board is busy doing other stuff, you might consider to use
  99  * RXRE (data ready intrrupt) instead.
 100  *
 101  * The other option is to make these INTR masks run-time configurable, so
 102  * that people can dynamically adapt them according to the current usage.
 103  *                                  -- Vladimir Gurevich
 104  */
 105
 106 /* (es) */
 107 #if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328)
 108 #define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN)
 109 #elif defined(CONFIG_M68328)
 110 #define USTCNT_RX_INTR_MASK (USTCNT_RXRE)
 111 #else
 112 #error Please, define the Rx interrupt events for your CPU
 113 #endif
 114 /* (/es) */
 115
 116 /*
 117  * This is our internal structure for each serial port's state.
 118  *
 119  * Many fields are paralleled by the structure used by the serial_struct
 120  * structure.
 121  *
 122  * For definitions of the flags field, see tty.h
 123  */
 124
 125 struct m68k_serial {
 126         char soft_carrier;  /* Use soft carrier on this channel */
 127         char break_abort;   /* Is serial console in, so process brk/abrt */
 128         char is_cons;       /* Is this our console. */
 129
 130         /* We need to know the current clock divisor
 131          * to read the bps rate the chip has currently
 132          * loaded.
 133          */
 134         unsigned char clk_divisor;  /* May be 1, 16, 32, or 64 */
 135         int baud;
 136         int                     magic;
 137         int                     baud_base;
 138         int                     port;
 139         int                     irq;
 140         int                     flags;          /* defined in tty.h */
 141         int                     type;           /* UART type */
 142         struct tty_struct       *tty;
 143         int                     read_status_mask;
 144         int                     ignore_status_mask;
 145         int                     timeout;
 146         int                     xmit_fifo_size;
 147         int                     custom_divisor;
 148         int                     x_char; /* xon/xoff character */
 149         int                     close_delay;
 150         unsigned short          closing_wait;
 151         unsigned short          closing_wait2;
 152         unsigned long           event;
 153         unsigned long           last_active;
 154         int                     line;
 155         int                     count;      /* # of fd on device */
 156         int                     blocked_open; /* # of blocked opens */
 157         unsigned char           *xmit_buf;
 158         int                     xmit_head;
 159         int                     xmit_tail;
 160         int                     xmit_cnt;
 161         wait_queue_head_t       open_wait;
 162         wait_queue_head_t       close_wait;
 163 };
 164
 165
 166 #define SERIAL_MAGIC 0x5301
 167
 168 /*
 169  * The size of the serial xmit buffer is 1 page, or 4096 bytes
 170  */
 171 #define SERIAL_XMIT_SIZE 4096
 172
 173 /*
 174  * Events are used to schedule things to happen at timer-interrupt
 175  * time, instead of at rs interrupt time.
 176  */
 177 #define RS_EVENT_WRITE_WAKEUP   0
 178
 179 /*
 180  * Define the number of ports supported and their irqs.
 181  */
 182 #define NR_PORTS 1
 183 #define UART_IRQ_DEFNS {UART_IRQ_NUM}
 184
 185 #endif /* __KERNEL__ */
 186 #endif /* !(_MC683XX_SERIAL_H) */