drivers/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 #include <linux/config.h>
  15
  16 struct serial_struct {
  17         int     type;
  18         int     line;
  19         int     port;
  20         int     irq;
  21         int     flags;
  22         int     xmit_fifo_size;
  23         int     custom_divisor;
  24         int     baud_base;
  25         unsigned short  close_delay;
  26         char    reserved_char[2];
  27         int     hub6;  /* FIXME: We don't have AT&T Hub6 boards! */
  28         unsigned short  closing_wait; /* time to wait before closing */
  29         unsigned short  closing_wait2; /* no longer used... */
  30         int     reserved[4];
  31 };
  32
  33 /*
  34  * For the close wait times, 0 means wait forever for serial port to
  35  * flush its output.  65535 means don't wait at all.
  36  */
  37 #define S_CLOSING_WAIT_INF      0
  38 #define S_CLOSING_WAIT_NONE     65535
  39
  40 /*
  41  * Definitions for S_struct (and serial_struct) flags field
  42  */
  43 #define S_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes
  44                                    on the callout port */
  45 #define S_FOURPORT  0x0002      /* Set OU1, OUT2 per AST Fourport settings */
  46 #define S_SAK   0x0004  /* Secure Attention Key (Orange book) */
  47 #define S_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */
  48
  49 #define S_SPD_MASK      0x0030
  50 #define S_SPD_HI        0x0010  /* Use 56000 instead of 38400 bps */
  51
  52 #define S_SPD_VHI       0x0020  /* Use 115200 instead of 38400 bps */
  53 #define S_SPD_CUST      0x0030  /* Use user-specified divisor */
  54
  55 #define S_SKIP_TEST     0x0040 /* Skip UART test during autoconfiguration */
  56 #define S_AUTO_IRQ  0x0080 /* Do automatic IRQ during autoconfiguration */
  57 #define S_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
  58 #define S_PGRP_LOCKOUT    0x0200 /* Lock out cua opens based on pgrp */
  59 #define S_CALLOUT_NOHUP   0x0400 /* Don't do hangups for cua device */
  60
  61 #define S_FLAGS 0x0FFF  /* Possible legal S flags */
  62 #define S_USR_MASK 0x0430       /* Legal flags that non-privileged
  63                                  * users can set or reset */
  64
  65 /* Internal flags used only by kernel/chr_drv/serial.c */
  66 #define S_INITIALIZED   0x80000000 /* Serial port was initialized */
  67 #define S_CALLOUT_ACTIVE        0x40000000 /* Call out device is active */
  68 #define S_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
  69 #define S_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */
  70 #define S_CLOSING               0x08000000 /* Serial port is closing */
  71 #define S_CTS_FLOW              0x04000000 /* Do CTS flow control */
  72 #define S_CHECK_CD              0x02000000 /* i.e., CLOCAL */
  73
  74 /* Software state per channel */
  75
  76 #ifdef __KERNEL__
  77
  78 /*
  79  * I believe this is the optimal setting that reduces the number of interrupts.
  80  * At high speeds the output might become a little "bursted" (use USTCNT_TXHE
  81  * if that bothers you), but in most cases it will not, since we try to
  82  * transmit characters every time rs_interrupt is called. Thus, quite often
  83  * you'll see that a receive interrupt occures before the transmit one.
  84  *                                  -- Vladimir Gurevich
  85  */
  86 #define USTCNT_TX_INTR_MASK (USTCNT_TXEE)
  87
  88 /*
  89  * 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special
  90  * "Old data interrupt" which occures whenever the data stay in the FIFO
  91  * longer than 30 bits time. This allows us to use FIFO without compromising
  92  * latency. '328 does not have this feature and without the real  328-based
  93  * board I would assume that RXRE is the safest setting.
  94  *
  95  * For EZ328 I use RXHE (Half empty) interrupt to reduce the number of
  96  * interrupts. RXFE (receive queue full) causes the system to lose data
  97  * at least at 115200 baud
  98  *
  99  * If your board is busy doing other stuff, you might consider to use
 100  * RXRE (data ready intrrupt) instead.
 101  *
 102  * The other option is to make these INTR masks run-time configurable, so
 103  * that people can dynamically adapt them according to the current usage.
 104  *                                  -- Vladimir Gurevich
 105  */
 106
 107 /* (es) */
 108 #if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328)
 109 #define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN)
 110 #elif defined(CONFIG_M68328)
 111 #define USTCNT_RX_INTR_MASK (USTCNT_RXRE)
 112 #else
 113 #error Please, define the Rx interrupt events for your CPU
 114 #endif
 115 /* (/es) */
 116
 117 /*
 118  * This is our internal structure for each serial port's state.
 119  *
 120  * Many fields are paralleled by the structure used by the serial_struct
 121  * structure.
 122  *
 123  * For definitions of the flags field, see tty.h
 124  */
 125
 126 struct m68k_serial {
 127         char soft_carrier;  /* Use soft carrier on this channel */
 128         char break_abort;   /* Is serial console in, so process brk/abrt */
 129         char is_cons;       /* Is this our console. */
 130
 131         /* We need to know the current clock divisor
 132          * to read the bps rate the chip has currently
 133          * loaded.
 134          */
 135         unsigned char clk_divisor;  /* May be 1, 16, 32, or 64 */
 136         int baud;
 137         int                     magic;
 138         int                     baud_base;
 139         int                     port;
 140         int                     irq;
 141         int                     flags;          /* defined in tty.h */
 142         int                     type;           /* UART type */
 143         struct tty_struct       *tty;
 144         int                     read_status_mask;
 145         int                     ignore_status_mask;
 146         int                     timeout;
 147         int                     xmit_fifo_size;
 148         int                     custom_divisor;
 149         int                     x_char; /* xon/xoff character */
 150         int                     close_delay;
 151         unsigned short          closing_wait;
 152         unsigned short          closing_wait2;
 153         unsigned long           event;
 154         unsigned long           last_active;
 155         int                     line;
 156         int                     count;      /* # of fd on device */
 157         int                     blocked_open; /* # of blocked opens */
 158         unsigned char           *xmit_buf;
 159         int                     xmit_head;
 160         int                     xmit_tail;
 161         int                     xmit_cnt;
 162         struct work_struct      tqueue;
 163         struct work_struct      tqueue_hangup;
 164         wait_queue_head_t       open_wait;
 165         wait_queue_head_t       close_wait;
 166 };
 167
 168
 169 #define SERIAL_MAGIC 0x5301
 170
 171 /*
 172  * The size of the serial xmit buffer is 1 page, or 4096 bytes
 173  */
 174 #define SERIAL_XMIT_SIZE 4096
 175
 176 /*
 177  * Events are used to schedule things to happen at timer-interrupt
 178  * time, instead of at rs interrupt time.
 179  */
 180 #define RS_EVENT_WRITE_WAKEUP   0
 181
 182 /*
 183  * Define the number of ports supported and their irqs.
 184  */
 185 #ifndef CONFIG_68328_SERIAL_UART2
 186 #define NR_PORTS 1
 187 #define UART_IRQ_DEFNS {UART_IRQ_NUM}
 188 #else
 189 #define NR_PORTS 2
 190 #define UART_IRQ_DEFNS {UART1_IRQ_NUM, UART2_IRQ_NUM}
 191 #endif
 192
 193 #endif /* __KERNEL__ */
 194 #endif /* !(_MC683XX_SERIAL_H) */