drivers/tc/zs.h

   1 /*
   2  * drivers/tc/zs.h: Definitions for the DECstation Z85C30 serial driver.
   3  *
   4  * Adapted from drivers/sbus/char/sunserial.h by Paul Mackerras.
   5  * Adapted from drivers/macintosh/macserial.h by Harald Koerfgen.
   6  *
   7  * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
   8  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   9  * Copyright (C) 2004, 2005  Maciej W. Rozycki
  10  */
  11 #ifndef _DECSERIAL_H
  12 #define _DECSERIAL_H
  13
  14 #include <asm/dec/serial.h>
  15
  16 #define NUM_ZSREGS 16
  17
  18 struct serial_struct {
  19         int     type;
  20         int     line;
  21         int     port;
  22         int     irq;
  23         int     flags;
  24         int     xmit_fifo_size;
  25         int     custom_divisor;
  26         int     baud_base;
  27         unsigned short  close_delay;
  28         char    reserved_char[2];
  29         int     hub6;
  30         unsigned short  closing_wait; /* time to wait before closing */
  31         unsigned short  closing_wait2; /* no longer used... */
  32         int     reserved[4];
  33 };
  34
  35 /*
  36  * For the close wait times, 0 means wait forever for serial port to
  37  * flush its output.  65535 means don't wait at all.
  38  */
  39 #define ZILOG_CLOSING_WAIT_INF  0
  40 #define ZILOG_CLOSING_WAIT_NONE 65535
  41
  42 /*
  43  * Definitions for ZILOG_struct (and serial_struct) flags field
  44  */
  45 #define ZILOG_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes
  46                                    on the callout port */
  47 #define ZILOG_FOURPORT  0x0002  /* Set OU1, OUT2 per AST Fourport settings */
  48 #define ZILOG_SAK       0x0004  /* Secure Attention Key (Orange book) */
  49 #define ZILOG_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */
  50
  51 #define ZILOG_SPD_MASK  0x0030
  52 #define ZILOG_SPD_HI    0x0010  /* Use 56000 instead of 38400 bps */
  53
  54 #define ZILOG_SPD_VHI   0x0020  /* Use 115200 instead of 38400 bps */
  55 #define ZILOG_SPD_CUST  0x0030  /* Use user-specified divisor */
  56
  57 #define ZILOG_SKIP_TEST 0x0040 /* Skip UART test during autoconfiguration */
  58 #define ZILOG_AUTO_IRQ  0x0080 /* Do automatic IRQ during autoconfiguration */
  59 #define ZILOG_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
  60 #define ZILOG_PGRP_LOCKOUT    0x0200 /* Lock out cua opens based on pgrp */
  61 #define ZILOG_CALLOUT_NOHUP   0x0400 /* Don't do hangups for cua device */
  62
  63 #define ZILOG_FLAGS     0x0FFF  /* Possible legal ZILOG flags */
  64 #define ZILOG_USR_MASK 0x0430   /* Legal flags that non-privileged
  65                                  * users can set or reset */
  66
  67 /* Internal flags used only by kernel/chr_drv/serial.c */
  68 #define ZILOG_INITIALIZED       0x80000000 /* Serial port was initialized */
  69 #define ZILOG_CALLOUT_ACTIVE    0x40000000 /* Call out device is active */
  70 #define ZILOG_NORMAL_ACTIVE     0x20000000 /* Normal device is active */
  71 #define ZILOG_BOOT_AUTOCONF     0x10000000 /* Autoconfigure port on bootup */
  72 #define ZILOG_CLOSING           0x08000000 /* Serial port is closing */
  73 #define ZILOG_CTS_FLOW          0x04000000 /* Do CTS flow control */
  74 #define ZILOG_CHECK_CD          0x02000000 /* i.e., CLOCAL */
  75
  76 /* Software state per channel */
  77
  78 #ifdef __KERNEL__
  79 /*
  80  * This is our internal structure for each serial port's state.
  81  *
  82  * Many fields are paralleled by the structure used by the serial_struct
  83  * structure.
  84  *
  85  * For definitions of the flags field, see tty.h
  86  */
  87
  88 struct dec_zschannel {
  89         volatile unsigned char *control;
  90         volatile unsigned char *data;
  91
  92         /* Current write register values */
  93         unsigned char curregs[NUM_ZSREGS];
  94 };
  95
  96 struct dec_serial {
  97         struct dec_serial       *zs_next;       /* For IRQ servicing chain.  */
  98         struct dec_zschannel    *zs_channel;    /* Channel registers.  */
  99         struct dec_zschannel    *zs_chan_a;     /* A side registers.  */
 100         unsigned char           read_reg_zero;
 101
 102         struct dec_serial_hook  *hook;          /* Hook on this channel.  */
 103         int                     tty_break;      /* Set on BREAK condition.  */
 104         int                     is_cons;        /* Is this our console.  */
 105         int                     tx_active;      /* Char is being xmitted.  */
 106         int                     tx_stopped;     /* Output is suspended.  */
 107
 108         /*
 109          * We need to know the current clock divisor
 110          * to read the bps rate the chip has currently loaded.
 111          */
 112         int                     clk_divisor;    /* May be 1, 16, 32, or 64.  */
 113         int                     zs_baud;
 114
 115         char                    change_needed;
 116
 117         int                     magic;
 118         int                     baud_base;
 119         int                     port;
 120         int                     irq;
 121         int                     flags;          /* Defined in tty.h.  */
 122         int                     type;           /* UART type.  */
 123         struct tty_struct       *tty;
 124         int                     read_status_mask;
 125         int                     ignore_status_mask;
 126         int                     timeout;
 127         int                     xmit_fifo_size;
 128         int                     custom_divisor;
 129         int                     x_char;         /* XON/XOFF character.  */
 130         int                     close_delay;
 131         unsigned short          closing_wait;
 132         unsigned short          closing_wait2;
 133         unsigned long           event;
 134         unsigned long           last_active;
 135         int                     line;
 136         int                     count;          /* # of fds on device.  */
 137         int                     blocked_open;   /* # of blocked opens.  */
 138         unsigned char           *xmit_buf;
 139         int                     xmit_head;
 140         int                     xmit_tail;
 141         int                     xmit_cnt;
 142         struct tasklet_struct   tlet;
 143         wait_queue_head_t       open_wait;
 144         wait_queue_head_t       close_wait;
 145 };
 146
 147
 148 #define SERIAL_MAGIC 0x5301
 149
 150 /*
 151  * The size of the serial xmit buffer is 1 page, or 4096 bytes
 152  */
 153 #define SERIAL_XMIT_SIZE 4096
 154
 155 /*
 156  * Events are used to schedule things to happen at timer-interrupt
 157  * time, instead of at rs interrupt time.
 158  */
 159 #define RS_EVENT_WRITE_WAKEUP   0
 160
 161 #endif /* __KERNEL__ */
 162
 163 /* Conversion routines to/from brg time constants from/to bits
 164  * per second.
 165  */
 166 #define BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
 167 #define BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)
 168
 169 /* The Zilog register set */
 170
 171 #define FLAG    0x7e
 172
 173 /* Write Register 0 */
 174 #define R0      0               /* Register selects */
 175 #define R1      1
 176 #define R2      2
 177 #define R3      3
 178 #define R4      4
 179 #define R5      5
 180 #define R6      6
 181 #define R7      7
 182 #define R8      8
 183 #define R9      9
 184 #define R10     10
 185 #define R11     11
 186 #define R12     12
 187 #define R13     13
 188 #define R14     14
 189 #define R15     15
 190
 191 #define NULLCODE        0       /* Null Code */
 192 #define POINT_HIGH      0x8     /* Select upper half of registers */
 193 #define RES_EXT_INT     0x10    /* Reset Ext. Status Interrupts */
 194 #define SEND_ABORT      0x18    /* HDLC Abort */
 195 #define RES_RxINT_FC    0x20    /* Reset RxINT on First Character */
 196 #define RES_Tx_P        0x28    /* Reset TxINT Pending */
 197 #define ERR_RES         0x30    /* Error Reset */
 198 #define RES_H_IUS       0x38    /* Reset highest IUS */
 199
 200 #define RES_Rx_CRC      0x40    /* Reset Rx CRC Checker */
 201 #define RES_Tx_CRC      0x80    /* Reset Tx CRC Checker */
 202 #define RES_EOM_L       0xC0    /* Reset EOM latch */
 203
 204 /* Write Register 1 */
 205
 206 #define EXT_INT_ENAB    0x1     /* Ext Int Enable */
 207 #define TxINT_ENAB      0x2     /* Tx Int Enable */
 208 #define PAR_SPEC        0x4     /* Parity is special condition */
 209
 210 #define RxINT_DISAB     0       /* Rx Int Disable */
 211 #define RxINT_FCERR     0x8     /* Rx Int on First Character Only or Error */
 212 #define RxINT_ALL       0x10    /* Int on all Rx Characters or error */
 213 #define RxINT_ERR       0x18    /* Int on error only */
 214 #define RxINT_MASK      0x18
 215
 216 #define WT_RDY_RT       0x20    /* Wait/Ready on R/T */
 217 #define WT_FN_RDYFN     0x40    /* Wait/FN/Ready FN */
 218 #define WT_RDY_ENAB     0x80    /* Wait/Ready Enable */
 219
 220 /* Write Register #2 (Interrupt Vector) */
 221
 222 /* Write Register 3 */
 223
 224 #define RxENABLE        0x1     /* Rx Enable */
 225 #define SYNC_L_INH      0x2     /* Sync Character Load Inhibit */
 226 #define ADD_SM          0x4     /* Address Search Mode (SDLC) */
 227 #define RxCRC_ENAB      0x8     /* Rx CRC Enable */
 228 #define ENT_HM          0x10    /* Enter Hunt Mode */
 229 #define AUTO_ENAB       0x20    /* Auto Enables */
 230 #define Rx5             0x0     /* Rx 5 Bits/Character */
 231 #define Rx7             0x40    /* Rx 7 Bits/Character */
 232 #define Rx6             0x80    /* Rx 6 Bits/Character */
 233 #define Rx8             0xc0    /* Rx 8 Bits/Character */
 234 #define RxNBITS_MASK    0xc0
 235
 236 /* Write Register 4 */
 237
 238 #define PAR_ENA         0x1     /* Parity Enable */
 239 #define PAR_EVEN        0x2     /* Parity Even/Odd* */
 240
 241 #define SYNC_ENAB       0       /* Sync Modes Enable */
 242 #define SB1             0x4     /* 1 stop bit/char */
 243 #define SB15            0x8     /* 1.5 stop bits/char */
 244 #define SB2             0xc     /* 2 stop bits/char */
 245 #define SB_MASK         0xc
 246
 247 #define MONSYNC         0       /* 8 Bit Sync character */
 248 #define BISYNC          0x10    /* 16 bit sync character */
 249 #define SDLC            0x20    /* SDLC Mode (01111110 Sync Flag) */
 250 #define EXTSYNC         0x30    /* External Sync Mode */
 251
 252 #define X1CLK           0x0     /* x1 clock mode */
 253 #define X16CLK          0x40    /* x16 clock mode */
 254 #define X32CLK          0x80    /* x32 clock mode */
 255 #define X64CLK          0xC0    /* x64 clock mode */
 256 #define XCLK_MASK       0xC0
 257
 258 /* Write Register 5 */
 259
 260 #define TxCRC_ENAB      0x1     /* Tx CRC Enable */
 261 #define RTS             0x2     /* RTS */
 262 #define SDLC_CRC        0x4     /* SDLC/CRC-16 */
 263 #define TxENAB          0x8     /* Tx Enable */
 264 #define SND_BRK         0x10    /* Send Break */
 265 #define Tx5             0x0     /* Tx 5 bits (or less)/character */
 266 #define Tx7             0x20    /* Tx 7 bits/character */
 267 #define Tx6             0x40    /* Tx 6 bits/character */
 268 #define Tx8             0x60    /* Tx 8 bits/character */
 269 #define TxNBITS_MASK    0x60
 270 #define DTR             0x80    /* DTR */
 271
 272 /* Write Register 6 (Sync bits 0-7/SDLC Address Field) */
 273
 274 /* Write Register 7 (Sync bits 8-15/SDLC 01111110) */
 275
 276 /* Write Register 8 (transmit buffer) */
 277
 278 /* Write Register 9 (Master interrupt control) */
 279 #define VIS     1       /* Vector Includes Status */
 280 #define NV      2       /* No Vector */
 281 #define DLC     4       /* Disable Lower Chain */
 282 #define MIE     8       /* Master Interrupt Enable */
 283 #define STATHI  0x10    /* Status high */
 284 #define SOFTACK 0x20    /* Software Interrupt Acknowledge */
 285 #define NORESET 0       /* No reset on write to R9 */
 286 #define CHRB    0x40    /* Reset channel B */
 287 #define CHRA    0x80    /* Reset channel A */
 288 #define FHWRES  0xc0    /* Force hardware reset */
 289
 290 /* Write Register 10 (misc control bits) */
 291 #define BIT6    1       /* 6 bit/8bit sync */
 292 #define LOOPMODE 2      /* SDLC Loop mode */
 293 #define ABUNDER 4       /* Abort/flag on SDLC xmit underrun */
 294 #define MARKIDLE 8      /* Mark/flag on idle */
 295 #define GAOP    0x10    /* Go active on poll */
 296 #define NRZ     0       /* NRZ mode */
 297 #define NRZI    0x20    /* NRZI mode */
 298 #define FM1     0x40    /* FM1 (transition = 1) */
 299 #define FM0     0x60    /* FM0 (transition = 0) */
 300 #define CRCPS   0x80    /* CRC Preset I/O */
 301
 302 /* Write Register 11 (Clock Mode control) */
 303 #define TRxCXT  0       /* TRxC = Xtal output */
 304 #define TRxCTC  1       /* TRxC = Transmit clock */
 305 #define TRxCBR  2       /* TRxC = BR Generator Output */
 306 #define TRxCDP  3       /* TRxC = DPLL output */
 307 #define TRxCOI  4       /* TRxC O/I */
 308 #define TCRTxCP 0       /* Transmit clock = RTxC pin */
 309 #define TCTRxCP 8       /* Transmit clock = TRxC pin */
 310 #define TCBR    0x10    /* Transmit clock = BR Generator output */
 311 #define TCDPLL  0x18    /* Transmit clock = DPLL output */
 312 #define RCRTxCP 0       /* Receive clock = RTxC pin */
 313 #define RCTRxCP 0x20    /* Receive clock = TRxC pin */
 314 #define RCBR    0x40    /* Receive clock = BR Generator output */
 315 #define RCDPLL  0x60    /* Receive clock = DPLL output */
 316 #define RTxCX   0x80    /* RTxC Xtal/No Xtal */
 317
 318 /* Write Register 12 (lower byte of baud rate generator time constant) */
 319
 320 /* Write Register 13 (upper byte of baud rate generator time constant) */
 321
 322 /* Write Register 14 (Misc control bits) */
 323 #define BRENABL 1       /* Baud rate generator enable */
 324 #define BRSRC   2       /* Baud rate generator source */
 325 #define DTRREQ  4       /* DTR/Request function */
 326 #define AUTOECHO 8      /* Auto Echo */
 327 #define LOOPBAK 0x10    /* Local loopback */
 328 #define SEARCH  0x20    /* Enter search mode */
 329 #define RMC     0x40    /* Reset missing clock */
 330 #define DISDPLL 0x60    /* Disable DPLL */
 331 #define SSBR    0x80    /* Set DPLL source = BR generator */
 332 #define SSRTxC  0xa0    /* Set DPLL source = RTxC */
 333 #define SFMM    0xc0    /* Set FM mode */
 334 #define SNRZI   0xe0    /* Set NRZI mode */
 335
 336 /* Write Register 15 (external/status interrupt control) */
 337 #define ZCIE    2       /* Zero count IE */
 338 #define DCDIE   8       /* DCD IE */
 339 #define SYNCIE  0x10    /* Sync/hunt IE */
 340 #define CTSIE   0x20    /* CTS IE */
 341 #define TxUIE   0x40    /* Tx Underrun/EOM IE */
 342 #define BRKIE   0x80    /* Break/Abort IE */
 343
 344
 345 /* Read Register 0 */
 346 #define Rx_CH_AV        0x1     /* Rx Character Available */
 347 #define ZCOUNT          0x2     /* Zero count */
 348 #define Tx_BUF_EMP      0x4     /* Tx Buffer empty */
 349 #define DCD             0x8     /* DCD */
 350 #define SYNC_HUNT       0x10    /* Sync/hunt */
 351 #define CTS             0x20    /* CTS */
 352 #define TxEOM           0x40    /* Tx underrun */
 353 #define BRK_ABRT        0x80    /* Break/Abort */
 354
 355 /* Read Register 1 */
 356 #define ALL_SNT         0x1     /* All sent */
 357 /* Residue Data for 8 Rx bits/char programmed */
 358 #define RES3            0x8     /* 0/3 */
 359 #define RES4            0x4     /* 0/4 */
 360 #define RES5            0xc     /* 0/5 */
 361 #define RES6            0x2     /* 0/6 */
 362 #define RES7            0xa     /* 0/7 */
 363 #define RES8            0x6     /* 0/8 */
 364 #define RES18           0xe     /* 1/8 */
 365 #define RES28           0x0     /* 2/8 */
 366 /* Special Rx Condition Interrupts */
 367 #define PAR_ERR         0x10    /* Parity error */
 368 #define Rx_OVR          0x20    /* Rx Overrun Error */
 369 #define FRM_ERR         0x40    /* CRC/Framing Error */
 370 #define END_FR          0x80    /* End of Frame (SDLC) */
 371
 372 /* Read Register 2 (channel b only) - Interrupt vector */
 373
 374 /* Read Register 3 (interrupt pending register) ch a only */
 375 #define CHBEXT  0x1             /* Channel B Ext/Stat IP */
 376 #define CHBTxIP 0x2             /* Channel B Tx IP */
 377 #define CHBRxIP 0x4             /* Channel B Rx IP */
 378 #define CHAEXT  0x8             /* Channel A Ext/Stat IP */
 379 #define CHATxIP 0x10            /* Channel A Tx IP */
 380 #define CHARxIP 0x20            /* Channel A Rx IP */
 381
 382 /* Read Register 8 (receive data register) */
 383
 384 /* Read Register 10  (misc status bits) */
 385 #define ONLOOP  2               /* On loop */
 386 #define LOOPSEND 0x10           /* Loop sending */
 387 #define CLK2MIS 0x40            /* Two clocks missing */
 388 #define CLK1MIS 0x80            /* One clock missing */
 389
 390 /* Read Register 12 (lower byte of baud rate generator constant) */
 391
 392 /* Read Register 13 (upper byte of baud rate generator constant) */
 393
 394 /* Read Register 15 (value of WR 15) */
 395
 396 /* Misc macros */
 397 #define ZS_CLEARERR(channel)    (write_zsreg(channel, 0, ERR_RES))
 398 #define ZS_CLEARFIFO(channel)   do { volatile unsigned char garbage; \
 399                                      garbage = read_zsdata(channel); \
 400                                      garbage = read_zsdata(channel); \
 401                                      garbage = read_zsdata(channel); \
 402                                 } while(0)
 403
 404 #endif /* !(_DECSERIAL_H) */