drivers/char/scc.h

   1 /*
   2  * atari_SCC.h: Definitions for the Am8530 Serial Communications Controller
   3  *
   4  * Copyright 1994 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file COPYING in the main directory of this archive
   8  * for more details.
   9  *
  10  */
  11
  12
  13 #ifndef _SCC_H
  14 #define _SCC_H
  15
  16 #include <linux/delay.h>
  17
  18 /* Special configuration ioctls for the Atari SCC5380 Serial
  19  * Communications Controller
  20  */
  21
  22 /* ioctl command codes */
  23
  24 #define TIOCGATSCC      0x54c0  /* get SCC configuration */
  25 #define TIOCSATSCC      0x54c1  /* set SCC configuration */
  26 #define TIOCDATSCC      0x54c2  /* reset configuration to defaults */
  27
  28 /* Clock sources */
  29
  30 #define CLK_RTxC        0
  31 #define CLK_TRxC        1
  32 #define CLK_PCLK        2
  33
  34 /* baud_bases for the common clocks in the Atari. These are the real
  35  * frequencies divided by 16.
  36  */
  37
  38 #define SCC_BAUD_BASE_TIMC      19200   /* 0.3072 MHz from TT-MFP, Timer C */
  39 #define SCC_BAUD_BASE_BCLK      153600  /* 2.4576 MHz */
  40 #define SCC_BAUD_BASE_PCLK4     229500  /* 3.6720 MHz */
  41 #define SCC_BAUD_BASE_PCLK      503374  /* 8.0539763 MHz */
  42 #define SCC_BAUD_BASE_NONE      0       /* for not connected or unused
  43                                          * clock sources */
  44
  45 /* The SCC clock configuration structure */
  46
  47 struct scc_clock_config {
  48         unsigned        RTxC_base;      /* base_baud of RTxC */
  49         unsigned        TRxC_base;      /* base_baud of TRxC */
  50         unsigned        PCLK_base;      /* base_baud of PCLK, both channels! */
  51         struct {
  52                 unsigned clksrc;        /* CLK_RTxC, CLK_TRxC or CLK_PCLK */
  53                 unsigned divisor;       /* divisor for base baud, valid values:
  54                                          * see below */
  55         } baud_table[17];               /* For 50, 75, 110, 135, 150, 200, 300,
  56                                          * 600, 1200, 1800, 2400, 4800, 9600,
  57                                          * 19200, 38400, 57600 and 115200 bps.
  58                                          * The last two could be replaced by
  59                                          * other rates > 38400 if they're not
  60                                          * possible.
  61                                          */
  62 };
  63
  64 /* The following divisors are valid:
  65  *
  66  *   - CLK_RTxC: 1 or even (1, 2 and 4 are the direct modes, > 4 use
  67  *               the BRG)
  68  *
  69  *   - CLK_TRxC: 1, 2 or 4 (no BRG, only direct modes possible)
  70  *
  71  *   - CLK_PCLK: >= 4 and even (no direct modes, only BRG)
  72  *
  73  */
  74
  75 struct scc_port {
  76         struct gs_port          gs;
  77         volatile unsigned char  *ctrlp;
  78         volatile unsigned char  *datap;
  79         int                     x_char;         /* xon/xoff character */
  80         int                     c_dcd;
  81         int                     channel;
  82         struct scc_port         *port_a;        /* Reference to port A and B */
  83         struct scc_port         *port_b;        /*   structs for reg access  */
  84 };
  85
  86 #define SCC_MAGIC       0x52696368
  87
  88 /***********************************************************************/
  89 /*                                                                     */
  90 /*                             Register Names                          */
  91 /*                                                                     */
  92 /***********************************************************************/
  93
  94 /* The SCC documentation gives no explicit names to the registers,
  95  * they're just called WR0..15 and RR0..15. To make the source code
  96  * better readable and make the transparent write reg read access (see
  97  * below) possible, I christen them here with self-invented names.
  98  * Note that (real) read registers are assigned numbers 16..31. WR7'
  99  * has number 33.
 100  */
 101
 102 #define COMMAND_REG             0       /* wo */
 103 #define INT_AND_DMA_REG         1       /* wo */
 104 #define INT_VECTOR_REG          2       /* rw, common to both channels */
 105 #define RX_CTRL_REG             3       /* rw */
 106 #define AUX1_CTRL_REG           4       /* rw */
 107 #define TX_CTRL_REG             5       /* rw */
 108 #define SYNC_ADR_REG            6       /* wo */
 109 #define SYNC_CHAR_REG           7       /* wo */
 110 #define SDLC_OPTION_REG         33      /* wo */
 111 #define TX_DATA_REG             8       /* wo */
 112 #define MASTER_INT_CTRL         9       /* wo, common to both channels */
 113 #define AUX2_CTRL_REG           10      /* rw */
 114 #define CLK_CTRL_REG            11      /* wo */
 115 #define TIMER_LOW_REG           12      /* rw */
 116 #define TIMER_HIGH_REG          13      /* rw */
 117 #define DPLL_CTRL_REG           14      /* wo */
 118 #define INT_CTRL_REG            15      /* rw */
 119
 120 #define STATUS_REG              16      /* ro */
 121 #define SPCOND_STATUS_REG       17      /* wo */
 122 /* RR2 is WR2 for Channel A, Channel B gives vector + current status: */
 123 #define CURR_VECTOR_REG         18      /* Ch. B only, Ch. A for rw */
 124 #define INT_PENDING_REG         19      /* Channel A only! */
 125 /* RR4 is WR4, if b6(MR7') == 1 */
 126 /* RR5 is WR5, if b6(MR7') == 1 */
 127 #define FS_FIFO_LOW_REG         22      /* ro */
 128 #define FS_FIFO_HIGH_REG        23      /* ro */
 129 #define RX_DATA_REG             24      /* ro */
 130 /* RR9 is WR3, if b6(MR7') == 1 */
 131 #define DPLL_STATUS_REG         26      /* ro */
 132 /* RR11 is WR10, if b6(MR7') == 1 */
 133 /* RR12 is WR12 */
 134 /* RR13 is WR13 */
 135 /* RR14 not present */
 136 /* RR15 is WR15 */
 137
 138
 139 /***********************************************************************/
 140 /*                                                                     */
 141 /*                             Register Values                         */
 142 /*                                                                     */
 143 /***********************************************************************/
 144
 145
 146 /* WR0: COMMAND_REG "CR" */
 147
 148 #define CR_RX_CRC_RESET         0x40
 149 #define CR_TX_CRC_RESET         0x80
 150 #define CR_TX_UNDERRUN_RESET    0xc0
 151
 152 #define CR_EXTSTAT_RESET        0x10
 153 #define CR_SEND_ABORT           0x18
 154 #define CR_ENAB_INT_NEXT_RX     0x20
 155 #define CR_TX_PENDING_RESET     0x28
 156 #define CR_ERROR_RESET          0x30
 157 #define CR_HIGHEST_IUS_RESET    0x38
 158
 159
 160 /* WR1: INT_AND_DMA_REG "IDR" */
 161
 162 #define IDR_EXTSTAT_INT_ENAB    0x01
 163 #define IDR_TX_INT_ENAB         0x02
 164 #define IDR_PARERR_AS_SPCOND    0x04
 165
 166 #define IDR_RX_INT_DISAB        0x00
 167 #define IDR_RX_INT_FIRST        0x08
 168 #define IDR_RX_INT_ALL          0x10
 169 #define IDR_RX_INT_SPCOND       0x18
 170 #define IDR_RX_INT_MASK         0x18
 171
 172 #define IDR_WAITREQ_RX          0x20
 173 #define IDR_WAITREQ_IS_REQ      0x40
 174 #define IDR_WAITREQ_ENAB        0x80
 175
 176
 177 /* WR3: RX_CTRL_REG "RCR" */
 178
 179 #define RCR_RX_ENAB             0x01
 180 #define RCR_DISCARD_SYNC_CHARS  0x02
 181 #define RCR_ADDR_SEARCH         0x04
 182 #define RCR_CRC_ENAB            0x08
 183 #define RCR_SEARCH_MODE         0x10
 184 #define RCR_AUTO_ENAB_MODE      0x20
 185
 186 #define RCR_CHSIZE_MASK         0xc0
 187 #define RCR_CHSIZE_5            0x00
 188 #define RCR_CHSIZE_6            0x40
 189 #define RCR_CHSIZE_7            0x80
 190 #define RCR_CHSIZE_8            0xc0
 191
 192
 193 /* WR4: AUX1_CTRL_REG "A1CR" */
 194
 195 #define A1CR_PARITY_MASK        0x03
 196 #define A1CR_PARITY_NONE        0x00
 197 #define A1CR_PARITY_ODD         0x01
 198 #define A1CR_PARITY_EVEN        0x03
 199
 200 #define A1CR_MODE_MASK          0x0c
 201 #define A1CR_MODE_SYNCR         0x00
 202 #define A1CR_MODE_ASYNC_1       0x04
 203 #define A1CR_MODE_ASYNC_15      0x08
 204 #define A1CR_MODE_ASYNC_2       0x0c
 205
 206 #define A1CR_SYNCR_MODE_MASK    0x30
 207 #define A1CR_SYNCR_MONOSYNC     0x00
 208 #define A1CR_SYNCR_BISYNC       0x10
 209 #define A1CR_SYNCR_SDLC         0x20
 210 #define A1CR_SYNCR_EXTCSYNC     0x30
 211
 212 #define A1CR_CLKMODE_MASK       0xc0
 213 #define A1CR_CLKMODE_x1         0x00
 214 #define A1CR_CLKMODE_x16        0x40
 215 #define A1CR_CLKMODE_x32        0x80
 216 #define A1CR_CLKMODE_x64        0xc0
 217
 218
 219 /* WR5: TX_CTRL_REG "TCR" */
 220
 221 #define TCR_TX_CRC_ENAB         0x01
 222 #define TCR_RTS                 0x02
 223 #define TCR_USE_CRC_CCITT       0x00
 224 #define TCR_USE_CRC_16          0x04
 225 #define TCR_TX_ENAB             0x08
 226 #define TCR_SEND_BREAK          0x10
 227
 228 #define TCR_CHSIZE_MASK         0x60
 229 #define TCR_CHSIZE_5            0x00
 230 #define TCR_CHSIZE_6            0x20
 231 #define TCR_CHSIZE_7            0x40
 232 #define TCR_CHSIZE_8            0x60
 233
 234 #define TCR_DTR                 0x80
 235
 236
 237 /* WR7': SLDC_OPTION_REG "SOR" */
 238
 239 #define SOR_AUTO_TX_ENAB        0x01
 240 #define SOR_AUTO_EOM_RESET      0x02
 241 #define SOR_AUTO_RTS_MODE       0x04
 242 #define SOR_NRZI_DISAB_HIGH     0x08
 243 #define SOR_ALT_DTRREQ_TIMING   0x10
 244 #define SOR_READ_CRC_CHARS      0x20
 245 #define SOR_EXTENDED_REG_ACCESS 0x40
 246
 247
 248 /* WR9: MASTER_INT_CTRL "MIC" */
 249
 250 #define MIC_VEC_INCL_STAT       0x01
 251 #define MIC_NO_VECTOR           0x02
 252 #define MIC_DISAB_LOWER_CHAIN   0x04
 253 #define MIC_MASTER_INT_ENAB     0x08
 254 #define MIC_STATUS_HIGH         0x10
 255 #define MIC_IGN_INTACK          0x20
 256
 257 #define MIC_NO_RESET            0x00
 258 #define MIC_CH_A_RESET          0x40
 259 #define MIC_CH_B_RESET          0x80
 260 #define MIC_HARD_RESET          0xc0
 261
 262
 263 /* WR10: AUX2_CTRL_REG "A2CR" */
 264
 265 #define A2CR_SYNC_6             0x01
 266 #define A2CR_LOOP_MODE          0x02
 267 #define A2CR_ABORT_ON_UNDERRUN  0x04
 268 #define A2CR_MARK_IDLE          0x08
 269 #define A2CR_GO_ACTIVE_ON_POLL  0x10
 270
 271 #define A2CR_CODING_MASK        0x60
 272 #define A2CR_CODING_NRZ         0x00
 273 #define A2CR_CODING_NRZI        0x20
 274 #define A2CR_CODING_FM1         0x40
 275 #define A2CR_CODING_FM0         0x60
 276
 277 #define A2CR_PRESET_CRC_1       0x80
 278
 279
 280 /* WR11: CLK_CTRL_REG "CCR" */
 281
 282 #define CCR_TRxCOUT_MASK        0x03
 283 #define CCR_TRxCOUT_XTAL        0x00
 284 #define CCR_TRxCOUT_TXCLK       0x01
 285 #define CCR_TRxCOUT_BRG         0x02
 286 #define CCR_TRxCOUT_DPLL        0x03
 287
 288 #define CCR_TRxC_OUTPUT         0x04
 289
 290 #define CCR_TXCLK_MASK          0x18
 291 #define CCR_TXCLK_RTxC          0x00
 292 #define CCR_TXCLK_TRxC          0x08
 293 #define CCR_TXCLK_BRG           0x10
 294 #define CCR_TXCLK_DPLL          0x18
 295
 296 #define CCR_RXCLK_MASK          0x60
 297 #define CCR_RXCLK_RTxC          0x00
 298 #define CCR_RXCLK_TRxC          0x20
 299 #define CCR_RXCLK_BRG           0x40
 300 #define CCR_RXCLK_DPLL          0x60
 301
 302 #define CCR_RTxC_XTAL           0x80
 303
 304
 305 /* WR14: DPLL_CTRL_REG "DCR" */
 306
 307 #define DCR_BRG_ENAB            0x01
 308 #define DCR_BRG_USE_PCLK        0x02
 309 #define DCR_DTRREQ_IS_REQ       0x04
 310 #define DCR_AUTO_ECHO           0x08
 311 #define DCR_LOCAL_LOOPBACK      0x10
 312
 313 #define DCR_DPLL_EDGE_SEARCH    0x20
 314 #define DCR_DPLL_ERR_RESET      0x40
 315 #define DCR_DPLL_DISAB          0x60
 316 #define DCR_DPLL_CLK_BRG        0x80
 317 #define DCR_DPLL_CLK_RTxC       0xa0
 318 #define DCR_DPLL_FM             0xc0
 319 #define DCR_DPLL_NRZI           0xe0
 320
 321
 322 /* WR15: INT_CTRL_REG "ICR" */
 323
 324 #define ICR_OPTIONREG_SELECT    0x01
 325 #define ICR_ENAB_BRG_ZERO_INT   0x02
 326 #define ICR_USE_FS_FIFO         0x04
 327 #define ICR_ENAB_DCD_INT        0x08
 328 #define ICR_ENAB_SYNC_INT       0x10
 329 #define ICR_ENAB_CTS_INT        0x20
 330 #define ICR_ENAB_UNDERRUN_INT   0x40
 331 #define ICR_ENAB_BREAK_INT      0x80
 332
 333
 334 /* RR0: STATUS_REG "SR" */
 335
 336 #define SR_CHAR_AVAIL           0x01
 337 #define SR_BRG_ZERO             0x02
 338 #define SR_TX_BUF_EMPTY         0x04
 339 #define SR_DCD                  0x08
 340 #define SR_SYNC_ABORT           0x10
 341 #define SR_CTS                  0x20
 342 #define SR_TX_UNDERRUN          0x40
 343 #define SR_BREAK                0x80
 344
 345
 346 /* RR1: SPCOND_STATUS_REG "SCSR" */
 347
 348 #define SCSR_ALL_SENT           0x01
 349 #define SCSR_RESIDUAL_MASK      0x0e
 350 #define SCSR_PARITY_ERR         0x10
 351 #define SCSR_RX_OVERRUN         0x20
 352 #define SCSR_CRC_FRAME_ERR      0x40
 353 #define SCSR_END_OF_FRAME       0x80
 354
 355
 356 /* RR3: INT_PENDING_REG "IPR" */
 357
 358 #define IPR_B_EXTSTAT           0x01
 359 #define IPR_B_TX                0x02
 360 #define IPR_B_RX                0x04
 361 #define IPR_A_EXTSTAT           0x08
 362 #define IPR_A_TX                0x10
 363 #define IPR_A_RX                0x20
 364
 365
 366 /* RR7: FS_FIFO_HIGH_REG "FFHR" */
 367
 368 #define FFHR_CNT_MASK           0x3f
 369 #define FFHR_IS_FROM_FIFO       0x40
 370 #define FFHR_FIFO_OVERRUN       0x80
 371
 372
 373 /* RR10: DPLL_STATUS_REG "DSR" */
 374
 375 #define DSR_ON_LOOP             0x02
 376 #define DSR_ON_LOOP_SENDING     0x10
 377 #define DSR_TWO_CLK_MISSING     0x40
 378 #define DSR_ONE_CLK_MISSING     0x80
 379
 380 /***********************************************************************/
 381 /*                                                                     */
 382 /*                             Register Access                         */
 383 /*                                                                     */
 384 /***********************************************************************/
 385
 386
 387 /* The SCC needs 3.5 PCLK cycles recovery time between to register
 388  * accesses. PCLK runs with 8 MHz on an Atari, so this delay is 3.5 *
 389  * 125 ns = 437.5 ns. This is too short for udelay().
 390  * 10/16/95: A tstb mfp.par_dt_reg takes 600ns (sure?) and thus should be
 391  * quite right
 392  */
 393
 394 #define scc_reg_delay() \
 395     do {                        \
 396         if (MACH_IS_MVME16x || MACH_IS_BVME6000 || MACH_IS_MVME147)     \
 397                 __asm__ __volatile__ ( " nop; nop");                    \
 398         else if (MACH_IS_ATARI)                                         \
 399                 __asm__ __volatile__ ( "tstb %0" : : "g" (*_scc_del) : "cc" );\
 400     } while (0)
 401
 402 extern unsigned char scc_shadow[2][16];
 403
 404 /* The following functions should relax the somehow complicated
 405  * register access of the SCC. _SCCwrite() stores all written values
 406  * (except for WR0 and WR8) in shadow registers for later recall. This
 407  * removes the burden of remembering written values as needed. The
 408  * extra work of storing the value doesn't count, since a delay is
 409  * needed after a SCC access anyway. Additionally, _SCCwrite() manages
 410  * writes to WR0 and WR8 differently, because these can be accessed
 411  * directly with less overhead. Another special case are WR7 and WR7'.
 412  * _SCCwrite automatically checks what of this registers is selected
 413  * and changes b0 of WR15 if needed.
 414  *
 415  * _SCCread() for standard read registers is straightforward, except
 416  * for RR2 (split into two "virtual" registers: one for the value
 417  * written to WR2 (from the shadow) and one for the vector including
 418  * status from RR2, Ch. B) and RR3. The latter must be read from
 419  * Channel A, because it reads as all zeros on Ch. B. RR0 and RR8 can
 420  * be accessed directly as before.
 421  *
 422  * The two inline function contain complicated switch statements. But
 423  * I rely on regno and final_delay being constants, so gcc can reduce
 424  * the whole stuff to just some assembler statements.
 425  *
 426  * _SCCwrite and _SCCread aren't intended to be used directly under
 427  * normal circumstances. The macros SCCread[_ND] and SCCwrite[_ND] are
 428  * for that purpose. They assume that a local variable 'port' is
 429  * declared and pointing to the port's scc_struct entry. The
 430  * variants with "_NB" appended should be used if no other SCC
 431  * accesses follow immediately (within 0.5 usecs). They just skip the
 432  * final delay nops.
 433  *
 434  * Please note that accesses to SCC registers should only take place
 435  * when interrupts are turned off (at least if SCC interrupts are
 436  * enabled). Otherwise, an interrupt could interfere with the
 437  * two-stage accessing process.
 438  *
 439  */
 440
 441
 442 static __inline__ void _SCCwrite(
 443         struct scc_port *port,
 444         unsigned char *shadow,
 445         volatile unsigned char *_scc_del,
 446         int regno,
 447         unsigned char val, int final_delay )
 448 {
 449         switch( regno ) {
 450
 451           case COMMAND_REG:
 452                 /* WR0 can be written directly without pointing */
 453                 *port->ctrlp = val;
 454                 break;
 455
 456           case SYNC_CHAR_REG:
 457                 /* For WR7, first set b0 of WR15 to 0, if needed */
 458                 if (shadow[INT_CTRL_REG] & ICR_OPTIONREG_SELECT) {
 459                         *port->ctrlp = 15;
 460                         shadow[INT_CTRL_REG] &= ~ICR_OPTIONREG_SELECT;
 461                         scc_reg_delay();
 462                         *port->ctrlp = shadow[INT_CTRL_REG];
 463                         scc_reg_delay();
 464                 }
 465                 goto normal_case;
 466
 467           case SDLC_OPTION_REG:
 468                 /* For WR7', first set b0 of WR15 to 1, if needed */
 469                 if (!(shadow[INT_CTRL_REG] & ICR_OPTIONREG_SELECT)) {
 470                         *port->ctrlp = 15;
 471                         shadow[INT_CTRL_REG] |= ICR_OPTIONREG_SELECT;
 472                         scc_reg_delay();
 473                         *port->ctrlp = shadow[INT_CTRL_REG];
 474                         scc_reg_delay();
 475                 }
 476                 *port->ctrlp = 7;
 477                 shadow[8] = val;        /* WR7' shadowed at WR8 */
 478                 scc_reg_delay();
 479                 *port->ctrlp = val;
 480                 break;
 481
 482           case TX_DATA_REG:             /* WR8 */
 483                 /* TX_DATA_REG can be accessed directly on some h/w */
 484                 if (MACH_IS_MVME16x || MACH_IS_BVME6000 || MACH_IS_MVME147)
 485                 {
 486                         *port->ctrlp = regno;
 487                         scc_reg_delay();
 488                         *port->ctrlp = val;
 489                 }
 490                 else
 491                         *port->datap = val;
 492                 break;
 493
 494           case MASTER_INT_CTRL:
 495                 *port->ctrlp = regno;
 496                 val &= 0x3f;    /* bits 6..7 are the reset commands */
 497                 scc_shadow[0][regno] = val;
 498                 scc_reg_delay();
 499                 *port->ctrlp = val;
 500                 break;
 501
 502           case DPLL_CTRL_REG:
 503                 *port->ctrlp = regno;
 504                 val &= 0x1f;                    /* bits 5..7 are the DPLL commands */
 505                 shadow[regno] = val;
 506                 scc_reg_delay();
 507                 *port->ctrlp = val;
 508                 break;
 509
 510           case 1 ... 6:
 511           case 10 ... 13:
 512           case 15:
 513           normal_case:
 514                 *port->ctrlp = regno;
 515                 shadow[regno] = val;
 516                 scc_reg_delay();
 517                 *port->ctrlp = val;
 518                 break;
 519
 520           default:
 521                 printk( "Bad SCC write access to WR%d\n", regno );
 522                 break;
 523
 524         }
 525
 526         if (final_delay)
 527                 scc_reg_delay();
 528 }
 529
 530
 531 static __inline__ unsigned char _SCCread(
 532         struct scc_port *port,
 533         unsigned char *shadow,
 534         volatile unsigned char *_scc_del,
 535         int regno, int final_delay )
 536 {
 537         unsigned char rv;
 538
 539         switch( regno ) {
 540
 541                 /* --- real read registers --- */
 542           case STATUS_REG:
 543                 rv = *port->ctrlp;
 544                 break;
 545
 546           case INT_PENDING_REG:
 547                 /* RR3: read only from Channel A! */
 548                 port = port->port_a;
 549                 goto normal_case;
 550
 551           case RX_DATA_REG:
 552                 /* RR8 can be accessed directly on some h/w */
 553                 if (MACH_IS_MVME16x || MACH_IS_BVME6000 || MACH_IS_MVME147)
 554                 {
 555                         *port->ctrlp = 8;
 556                         scc_reg_delay();
 557                         rv = *port->ctrlp;
 558                 }
 559                 else
 560                         rv = *port->datap;
 561                 break;
 562
 563           case CURR_VECTOR_REG:
 564                 /* RR2 (vector including status) from Ch. B */
 565                 port = port->port_b;
 566                 goto normal_case;
 567
 568                 /* --- reading write registers: access the shadow --- */
 569           case 1 ... 7:
 570           case 10 ... 15:
 571                 return shadow[regno]; /* no final delay! */
 572
 573                 /* WR7' is special, because it is shadowed at the place of WR8 */
 574           case SDLC_OPTION_REG:
 575                 return shadow[8]; /* no final delay! */
 576
 577                 /* WR9 is special too, because it is common for both channels */
 578           case MASTER_INT_CTRL:
 579                 return scc_shadow[0][9]; /* no final delay! */
 580
 581           default:
 582                 printk( "Bad SCC read access to %cR%d\n", (regno & 16) ? 'R' : 'W',
 583                                 regno & ~16 );
 584                 break;
 585
 586           case SPCOND_STATUS_REG:
 587           case FS_FIFO_LOW_REG:
 588           case FS_FIFO_HIGH_REG:
 589           case DPLL_STATUS_REG:
 590           normal_case:
 591                 *port->ctrlp = regno & 0x0f;
 592                 scc_reg_delay();
 593                 rv = *port->ctrlp;
 594                 break;
 595
 596         }
 597
 598         if (final_delay)
 599                 scc_reg_delay();
 600         return rv;
 601 }
 602
 603 #define SCC_ACCESS_INIT(port)                                           \
 604         unsigned char *_scc_shadow = &scc_shadow[port->channel][0]
 605
 606 #define SCCwrite(reg,val)       _SCCwrite(port,_scc_shadow,scc_del,(reg),(val),1)
 607 #define SCCwrite_NB(reg,val)    _SCCwrite(port,_scc_shadow,scc_del,(reg),(val),0)
 608 #define SCCread(reg)            _SCCread(port,_scc_shadow,scc_del,(reg),1)
 609 #define SCCread_NB(reg)         _SCCread(port,_scc_shadow,scc_del,(reg),0)
 610
 611 #define SCCmod(reg,and,or)      SCCwrite((reg),(SCCread(reg)&(and))|(or))
 612
 613 #endif /* _SCC_H */