board/evb64260/mpsc.c

   1 /*
   2  * (C) Copyright 2001
   3  * John Clemens <clemens@mclx.com>, Mission Critical Linux, Inc.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * mpsc.c - driver for console over the MPSC.
  26  */
  27
  28 #include <common.h>
  29 #include <config.h>
  30 #include <asm/cache.h>
  31
  32 #include <malloc.h>
  33 #include "mpsc.h"
  34
  35 DECLARE_GLOBAL_DATA_PTR;
  36
  37 int (*mpsc_putchar)(char ch) = mpsc_putchar_early;
  38
  39 static volatile unsigned int *rx_desc_base=NULL;
  40 static unsigned int rx_desc_index=0;
  41 static volatile unsigned int *tx_desc_base=NULL;
  42 static unsigned int tx_desc_index=0;
  43
  44 /* local function declarations */
  45 static int galmpsc_connect(int channel, int connect);
  46 static int galmpsc_route_serial(int channel, int connect);
  47 static int galmpsc_route_rx_clock(int channel, int brg);
  48 static int galmpsc_route_tx_clock(int channel, int brg);
  49 static int galmpsc_write_config_regs(int mpsc, int mode);
  50 static int galmpsc_config_channel_regs(int mpsc);
  51 static int galmpsc_set_char_length(int mpsc, int value);
  52 static int galmpsc_set_stop_bit_length(int mpsc, int value);
  53 static int galmpsc_set_parity(int mpsc, int value);
  54 static int galmpsc_enter_hunt(int mpsc);
  55 static int galmpsc_set_brkcnt(int mpsc, int value);
  56 static int galmpsc_set_tcschar(int mpsc, int value);
  57 static int galmpsc_set_snoop(int mpsc, int value);
  58 static int galmpsc_shutdown(int mpsc);
  59
  60 static int galsdma_set_RFT(int channel);
  61 static int galsdma_set_SFM(int channel);
  62 static int galsdma_set_rxle(int channel);
  63 static int galsdma_set_txle(int channel);
  64 static int galsdma_set_burstsize(int channel, unsigned int value);
  65 static int galsdma_set_RC(int channel, unsigned int value);
  66
  67 static int galbrg_set_CDV(int channel, int value);
  68 static int galbrg_enable(int channel);
  69 static int galbrg_disable(int channel);
  70 static int galbrg_set_clksrc(int channel, int value);
  71 static int galbrg_set_CUV(int channel, int value);
  72
  73 static void galsdma_enable_rx(void);
  74
  75 /* static int galbrg_reset(int channel); */
  76
  77 #define SOFTWARE_CACHE_MANAGEMENT
  78
  79 #ifdef SOFTWARE_CACHE_MANAGEMENT
  80 #define FLUSH_DCACHE(a,b)                if(dcache_status()){clean_dcache_range((u32)(a),(u32)(b));}
  81 #define FLUSH_AND_INVALIDATE_DCACHE(a,b) if(dcache_status()){flush_dcache_range((u32)(a),(u32)(b));}
  82 #define INVALIDATE_DCACHE(a,b)           if(dcache_status()){invalidate_dcache_range((u32)(a),(u32)(b));}
  83 #else
  84 #define FLUSH_DCACHE(a,b)
  85 #define FLUSH_AND_INVALIDATE_DCACHE(a,b)
  86 #define INVALIDATE_DCACHE(a,b)
  87 #endif
  88
  89
  90 /* GT64240A errata: cant read MPSC/BRG registers... so make mirrors in ram for read/modify write */
  91 #define MIRROR_HACK ((struct _tag_mirror_hack *)&(gd->mirror_hack))
  92
  93 #define GT_REG_WRITE_MIRROR_G(a,d) {MIRROR_HACK->a ## _M = d; GT_REG_WRITE(a,d);}
  94 #define GTREGREAD_MIRROR_G(a) (MIRROR_HACK->a ## _M)
  95
  96 #define GT_REG_WRITE_MIRROR(a,i,g,d) {MIRROR_HACK->a ## _M[i] = d; GT_REG_WRITE(a + (i*g),d);}
  97 #define GTREGREAD_MIRROR(a,i,g) (MIRROR_HACK->a ## _M[i])
  98
  99 /* make sure this isn't bigger than 16 long words (u-boot.h) */
 100 struct _tag_mirror_hack {
 101     unsigned GALMPSC_PROTOCONF_REG_M[2];        /* 8008 */
 102     unsigned GALMPSC_CHANNELREG_1_M[2];         /* 800c */
 103     unsigned GALMPSC_CHANNELREG_2_M[2];         /* 8010 */
 104     unsigned GALBRG_0_CONFREG_M[2];             /* b200 */
 105
 106     unsigned GALMPSC_ROUTING_REGISTER_M;        /* b400 */
 107     unsigned GALMPSC_RxC_ROUTE_M;               /* b404 */
 108     unsigned GALMPSC_TxC_ROUTE_M;               /* b408 */
 109
 110     unsigned int baudrate;                      /* current baudrate, for tsc delay calc */
 111 };
 112
 113 /* static struct _tag_mirror_hack *mh = NULL;   */
 114
 115 /* special function for running out of flash.  doesn't modify any
 116  * global variables [josh] */
 117 int
 118 mpsc_putchar_early(char ch)
 119 {
 120         int mpsc=CHANNEL;
 121         int temp=GTREGREAD_MIRROR(GALMPSC_CHANNELREG_2,mpsc,GALMPSC_REG_GAP);
 122         galmpsc_set_tcschar(mpsc,ch);
 123         GT_REG_WRITE(GALMPSC_CHANNELREG_2+(mpsc*GALMPSC_REG_GAP), temp|0x200);
 124
 125 #define MAGIC_FACTOR    (10*1000000)
 126
 127         udelay(MAGIC_FACTOR / MIRROR_HACK->baudrate);
 128         return 0;
 129 }
 130
 131 /* This is used after relocation, see serial.c and mpsc_init2 */
 132 static int
 133 mpsc_putchar_sdma(char ch)
 134 {
 135         volatile unsigned int *p;
 136         unsigned int temp;
 137
 138
 139         /* align the descriptor */
 140         p = tx_desc_base;
 141         memset((void *)p, 0, 8 * sizeof(unsigned int));
 142
 143         /* fill one 64 bit buffer */
 144         /* word swap, pad with 0 */
 145         p[4] = 0;                                               /* x */
 146         p[5] = (unsigned int)ch;                                /* x */
 147
 148         /* CHANGED completely according to GT64260A dox - NTL */
 149         p[0] = 0x00010001;                                      /* 0 */
 150         p[1] = DESC_OWNER | DESC_FIRST | DESC_LAST;             /* 4 */
 151         p[2] = 0;                                               /* 8 */
 152         p[3] = (unsigned int)&p[4];                             /* c */
 153
 154 #if 0
 155         p[9] = DESC_FIRST | DESC_LAST;
 156         p[10] = (unsigned int)&p[0];
 157         p[11] = (unsigned int)&p[12];
 158 #endif
 159
 160         FLUSH_DCACHE(&p[0], &p[8]);
 161
 162         GT_REG_WRITE(GALSDMA_0_CUR_TX_PTR+(CHANNEL*GALSDMA_REG_DIFF),
 163                      (unsigned int)&p[0]);
 164         GT_REG_WRITE(GALSDMA_0_FIR_TX_PTR+(CHANNEL*GALSDMA_REG_DIFF),
 165                      (unsigned int)&p[0]);
 166
 167         temp = GTREGREAD(GALSDMA_0_COM_REG+(CHANNEL*GALSDMA_REG_DIFF));
 168         temp |= (TX_DEMAND | TX_STOP);
 169         GT_REG_WRITE(GALSDMA_0_COM_REG+(CHANNEL*GALSDMA_REG_DIFF), temp);
 170
 171         INVALIDATE_DCACHE(&p[1], &p[2]);
 172
 173         while(p[1] & DESC_OWNER) {
 174             udelay(100);
 175             INVALIDATE_DCACHE(&p[1], &p[2]);
 176         }
 177
 178         return 0;
 179 }
 180
 181 char mpsc_getchar (void)
 182 {
 183         static unsigned int done = 0;
 184         volatile char ch;
 185         unsigned int len = 0, idx = 0, temp;
 186
 187         volatile unsigned int *p;
 188
 189
 190         do {
 191                 p = &rx_desc_base[rx_desc_index * 8];
 192
 193                 INVALIDATE_DCACHE (&p[0], &p[1]);
 194                 /* Wait for character */
 195                 while (p[1] & DESC_OWNER) {
 196                         udelay (100);
 197                         INVALIDATE_DCACHE (&p[0], &p[1]);
 198                 }
 199
 200                 /* Handle error case */
 201                 if (p[1] & (1 << 15)) {
 202                         printf ("oops, error: %08x\n", p[1]);
 203
 204                         temp = GTREGREAD_MIRROR (GALMPSC_CHANNELREG_2,
 205                                                  CHANNEL, GALMPSC_REG_GAP);
 206                         temp |= (1 << 23);
 207                         GT_REG_WRITE_MIRROR (GALMPSC_CHANNELREG_2, CHANNEL,
 208                                              GALMPSC_REG_GAP, temp);
 209
 210                         /* Can't poll on abort bit, so we just wait. */
 211                         udelay (100);
 212
 213                         galsdma_enable_rx ();
 214                 }
 215
 216                 /* Number of bytes left in this descriptor */
 217                 len = p[0] & 0xffff;
 218
 219                 if (len) {
 220                         /* Where to look */
 221                         idx = 5;
 222                         if (done > 3)
 223                                 idx = 4;
 224                         if (done > 7)
 225                                 idx = 7;
 226                         if (done > 11)
 227                                 idx = 6;
 228
 229                         INVALIDATE_DCACHE (&p[idx], &p[idx + 1]);
 230                         ch = p[idx] & 0xff;
 231                         done++;
 232                 }
 233
 234                 if (done < len) {
 235                         /* this descriptor has more bytes still
 236                          * shift down the char we just read, and leave the
 237                          * buffer in place for the next time around
 238                          */
 239                         p[idx] = p[idx] >> 8;
 240                         FLUSH_DCACHE (&p[idx], &p[idx + 1]);
 241                 }
 242
 243                 if (done == len) {
 244                         /* nothing left in this descriptor.
 245                          * go to next one
 246                          */
 247                         p[1] = DESC_OWNER | DESC_FIRST | DESC_LAST;
 248                         p[0] = 0x00100000;
 249                         FLUSH_DCACHE (&p[0], &p[1]);
 250                         /* Next descriptor */
 251                         rx_desc_index = (rx_desc_index + 1) % RX_DESC;
 252                         done = 0;
 253                 }
 254         } while (len == 0);     /* galileo bug.. len might be zero */
 255
 256         return ch;
 257 }
 258
 259 int
 260 mpsc_test_char(void)
 261 {
 262         volatile unsigned int *p = &rx_desc_base[rx_desc_index*8];
 263
 264         INVALIDATE_DCACHE(&p[1], &p[2]);
 265
 266         if (p[1] & DESC_OWNER) return 0;
 267         else return 1;
 268 }
 269
 270 int
 271 mpsc_init(int baud)
 272 {
 273         memset(MIRROR_HACK, 0, sizeof(struct _tag_mirror_hack));
 274         MIRROR_HACK->GALMPSC_ROUTING_REGISTER_M=0x3fffffff;
 275
 276         /* BRG CONFIG */
 277         galbrg_set_baudrate(CHANNEL, baud);
 278 #if defined(CONFIG_ZUMA_V2) || defined(CONFIG_P3G4)
 279         galbrg_set_clksrc(CHANNEL,0x8); /* connect TCLK -> BRG */
 280 #else
 281         galbrg_set_clksrc(CHANNEL,0);
 282 #endif
 283         galbrg_set_CUV(CHANNEL, 0);
 284         galbrg_enable(CHANNEL);
 285
 286         /* Set up clock routing */
 287         galmpsc_connect(CHANNEL, GALMPSC_CONNECT);
 288         galmpsc_route_serial(CHANNEL, GALMPSC_CONNECT);
 289         galmpsc_route_rx_clock(CHANNEL, CHANNEL);
 290         galmpsc_route_tx_clock(CHANNEL, CHANNEL);
 291
 292         /* reset MPSC state */
 293         galmpsc_shutdown(CHANNEL);
 294
 295         /* SDMA CONFIG */
 296         galsdma_set_burstsize(CHANNEL, L1_CACHE_BYTES/8);       /* in 64 bit words (8 bytes) */
 297         galsdma_set_txle(CHANNEL);
 298         galsdma_set_rxle(CHANNEL);
 299         galsdma_set_RC(CHANNEL, 0xf);
 300         galsdma_set_SFM(CHANNEL);
 301         galsdma_set_RFT(CHANNEL);
 302
 303         /* MPSC CONFIG */
 304         galmpsc_write_config_regs(CHANNEL, GALMPSC_UART);
 305         galmpsc_config_channel_regs(CHANNEL);
 306         galmpsc_set_char_length(CHANNEL, GALMPSC_CHAR_LENGTH_8);       /* 8 */
 307         galmpsc_set_parity(CHANNEL, GALMPSC_PARITY_NONE);              /* N */
 308         galmpsc_set_stop_bit_length(CHANNEL, GALMPSC_STOP_BITS_1);     /* 1 */
 309
 310         /* COMM_MPSC CONFIG */
 311 #ifdef SOFTWARE_CACHE_MANAGEMENT
 312         galmpsc_set_snoop(CHANNEL, 0);                          /* disable snoop */
 313 #else
 314         galmpsc_set_snoop(CHANNEL, 1);                          /* enable snoop */
 315 #endif
 316
 317         return 0;
 318 }
 319
 320 void
 321 mpsc_init2(void)
 322 {
 323         int i;
 324
 325         mpsc_putchar = mpsc_putchar_sdma;
 326
 327         /* RX descriptors */
 328         rx_desc_base = (unsigned int *)malloc(((RX_DESC+1)*8) *
 329                 sizeof(unsigned int));
 330
 331         /* align descriptors */
 332         rx_desc_base = (unsigned int *)
 333                 (((unsigned int)rx_desc_base+32) & 0xFFFFFFF0);
 334
 335         rx_desc_index = 0;
 336
 337         memset((void *)rx_desc_base, 0, (RX_DESC*8)*sizeof(unsigned int));
 338
 339         for (i = 0; i < RX_DESC; i++) {
 340                 rx_desc_base[i*8 + 3] = (unsigned int)&rx_desc_base[i*8 + 4]; /* Buffer */
 341                 rx_desc_base[i*8 + 2] = (unsigned int)&rx_desc_base[(i+1)*8]; /* Next descriptor */
 342                 rx_desc_base[i*8 + 1] = DESC_OWNER | DESC_FIRST | DESC_LAST;  /* Command & control */
 343                 rx_desc_base[i*8] = 0x00100000;
 344         }
 345         rx_desc_base[(i-1)*8 + 2] = (unsigned int)&rx_desc_base[0];
 346
 347         FLUSH_DCACHE(&rx_desc_base[0], &rx_desc_base[RX_DESC*8]);
 348         GT_REG_WRITE(GALSDMA_0_CUR_RX_PTR+(CHANNEL*GALSDMA_REG_DIFF),
 349                      (unsigned int)&rx_desc_base[0]);
 350
 351         /* TX descriptors */
 352         tx_desc_base = (unsigned int *)malloc(((TX_DESC+1)*8) *
 353                 sizeof(unsigned int));
 354
 355         /* align descriptors */
 356         tx_desc_base = (unsigned int *)
 357                 (((unsigned int)tx_desc_base+32) & 0xFFFFFFF0);
 358
 359         tx_desc_index = -1;
 360
 361         memset((void *)tx_desc_base, 0, (TX_DESC*8)*sizeof(unsigned int));
 362
 363         for (i = 0; i < TX_DESC; i++) {
 364                 tx_desc_base[i*8 + 5] = (unsigned int)0x23232323;
 365                 tx_desc_base[i*8 + 4] = (unsigned int)0x23232323;
 366                 tx_desc_base[i*8 + 3] = (unsigned int)&tx_desc_base[i*8 + 4];
 367                 tx_desc_base[i*8 + 2] = (unsigned int)&tx_desc_base[(i+1)*8];
 368                 tx_desc_base[i*8 + 1] = DESC_OWNER | DESC_FIRST | DESC_LAST;
 369
 370                 /* set sbytecnt and shadow byte cnt to 1 */
 371                 tx_desc_base[i*8] = 0x00010001;
 372         }
 373         tx_desc_base[(i-1)*8 + 2] = (unsigned int)&tx_desc_base[0];
 374
 375         FLUSH_DCACHE(&tx_desc_base[0], &tx_desc_base[TX_DESC*8]);
 376
 377         udelay(100);
 378
 379         galsdma_enable_rx();
 380
 381         return;
 382 }
 383
 384 int
 385 galbrg_set_baudrate(int channel, int rate)
 386 {
 387         int clock;
 388
 389         galbrg_disable(channel);
 390
 391 #if defined(CONFIG_ZUMA_V2) || defined(CONFIG_P3G4)
 392         /* from tclk */
 393         clock = (CONFIG_SYS_BUS_HZ/(16*rate)) - 1;
 394 #else
 395         clock = (3686400/(16*rate)) - 1;
 396 #endif
 397
 398         galbrg_set_CDV(channel, clock);
 399
 400         galbrg_enable(channel);
 401
 402         MIRROR_HACK->baudrate = rate;
 403
 404         return 0;
 405 }
 406
 407 /* ------------------------------------------------------------------ */
 408
 409 /* Below are all the private functions that no one else needs */
 410
 411 static int
 412 galbrg_set_CDV(int channel, int value)
 413 {
 414         unsigned int temp;
 415
 416         temp = GTREGREAD_MIRROR(GALBRG_0_CONFREG, channel, GALBRG_REG_GAP);
 417         temp &= 0xFFFF0000;
 418         temp |= (value & 0x0000FFFF);
 419         GT_REG_WRITE_MIRROR(GALBRG_0_CONFREG,channel,GALBRG_REG_GAP, temp);
 420
 421         return 0;
 422 }
 423
 424 static int
 425 galbrg_enable(int channel)
 426 {
 427         unsigned int temp;
 428
 429         temp = GTREGREAD_MIRROR(GALBRG_0_CONFREG, channel, GALBRG_REG_GAP);
 430         temp |= 0x00010000;
 431         GT_REG_WRITE_MIRROR(GALBRG_0_CONFREG, channel, GALBRG_REG_GAP,temp);
 432
 433         return 0;
 434 }
 435
 436 static int
 437 galbrg_disable(int channel)
 438 {
 439         unsigned int temp;
 440
 441         temp = GTREGREAD_MIRROR(GALBRG_0_CONFREG, channel, GALBRG_REG_GAP);
 442         temp &= 0xFFFEFFFF;
 443         GT_REG_WRITE_MIRROR(GALBRG_0_CONFREG, channel, GALBRG_REG_GAP,temp);
 444
 445         return 0;
 446 }
 447
 448 static int
 449 galbrg_set_clksrc(int channel, int value)
 450 {
 451         unsigned int temp;
 452
 453         temp = GTREGREAD_MIRROR(GALBRG_0_CONFREG,channel, GALBRG_REG_GAP);
 454         temp &= 0xFF83FFFF;
 455         temp |= (value << 18);
 456         GT_REG_WRITE_MIRROR(GALBRG_0_CONFREG,channel, GALBRG_REG_GAP,temp);
 457
 458         return 0;
 459 }
 460
 461 static int
 462 galbrg_set_CUV(int channel, int value)
 463 {
 464         GT_REG_WRITE(GALBRG_0_BTREG + (channel * GALBRG_REG_GAP), value);
 465
 466         return 0;
 467 }
 468
 469 #if 0
 470 static int
 471 galbrg_reset(int channel)
 472 {
 473         unsigned int temp;
 474
 475         temp = GTREGREAD(GALBRG_0_CONFREG + (channel * GALBRG_REG_GAP));
 476         temp |= 0x20000;
 477         GT_REG_WRITE(GALBRG_0_CONFREG + (channel * GALBRG_REG_GAP), temp);
 478
 479         return 0;
 480 }
 481 #endif
 482
 483 static int
 484 galsdma_set_RFT(int channel)
 485 {
 486         unsigned int temp;
 487
 488         temp = GTREGREAD(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF));
 489         temp |= 0x00000001;
 490         GT_REG_WRITE(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF), temp);
 491
 492         return 0;
 493 }
 494
 495 static int
 496 galsdma_set_SFM(int channel)
 497 {
 498         unsigned int temp;
 499
 500         temp = GTREGREAD(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF));
 501         temp |= 0x00000002;
 502         GT_REG_WRITE(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF), temp);
 503
 504         return 0;
 505 }
 506
 507 static int
 508 galsdma_set_rxle(int channel)
 509 {
 510         unsigned int temp;
 511
 512         temp = GTREGREAD(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF));
 513         temp |= 0x00000040;
 514         GT_REG_WRITE(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF), temp);
 515
 516         return 0;
 517 }
 518
 519 static int
 520 galsdma_set_txle(int channel)
 521 {
 522         unsigned int temp;
 523
 524         temp = GTREGREAD(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF));
 525         temp |= 0x00000080;
 526         GT_REG_WRITE(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF), temp);
 527
 528         return 0;
 529 }
 530
 531 static int
 532 galsdma_set_RC(int channel, unsigned int value)
 533 {
 534         unsigned int temp;
 535
 536         temp = GTREGREAD(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF));
 537         temp &= ~0x0000003c;
 538         temp |= (value << 2);
 539         GT_REG_WRITE(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF), temp);
 540
 541         return 0;
 542 }
 543
 544 static int
 545 galsdma_set_burstsize(int channel, unsigned int value)
 546 {
 547         unsigned int temp;
 548
 549         temp = GTREGREAD(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF));
 550         temp &= 0xFFFFCFFF;
 551         switch (value) {
 552          case 8:
 553                 GT_REG_WRITE(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF),
 554                              (temp | (0x3 << 12)));
 555                 break;
 556
 557          case 4:
 558                 GT_REG_WRITE(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF),
 559                              (temp | (0x2 << 12)));
 560                 break;
 561
 562          case 2:
 563                 GT_REG_WRITE(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF),
 564                              (temp | (0x1 << 12)));
 565                 break;
 566
 567          case 1:
 568                 GT_REG_WRITE(GALSDMA_0_CONF_REG+(channel*GALSDMA_REG_DIFF),
 569                              (temp | (0x0 << 12)));
 570                 break;
 571
 572          default:
 573                 return -1;
 574                 break;
 575         }
 576
 577         return 0;
 578 }
 579
 580 static int
 581 galmpsc_connect(int channel, int connect)
 582 {
 583         unsigned int temp;
 584
 585         temp = GTREGREAD_MIRROR_G(GALMPSC_ROUTING_REGISTER);
 586
 587         if ((channel == 0) && connect)
 588                 temp &= ~0x00000007;
 589         else if ((channel == 1) && connect)
 590                 temp &= ~(0x00000007 << 6);
 591         else if ((channel == 0) && !connect)
 592                 temp |= 0x00000007;
 593         else
 594                 temp |= (0x00000007 << 6);
 595
 596         /* Just in case... */
 597         temp &= 0x3fffffff;
 598
 599         GT_REG_WRITE_MIRROR_G(GALMPSC_ROUTING_REGISTER, temp);
 600
 601         return 0;
 602 }
 603
 604 static int
 605 galmpsc_route_serial(int channel, int connect)
 606 {
 607         unsigned int temp;
 608
 609         temp = GTREGREAD(GALMPSC_SERIAL_MULTIPLEX);
 610
 611         if ((channel == 0) && connect)
 612                 temp |= 0x00000100;
 613         else if ((channel == 1) && connect)
 614                 temp |= 0x00001000;
 615         else if ((channel == 0) && !connect)
 616                 temp &= ~0x00000100;
 617         else
 618                 temp &= ~0x00001000;
 619
 620         GT_REG_WRITE(GALMPSC_SERIAL_MULTIPLEX,temp);
 621
 622         return 0;
 623 }
 624
 625 static int
 626 galmpsc_route_rx_clock(int channel, int brg)
 627 {
 628         unsigned int temp;
 629
 630         temp = GTREGREAD_MIRROR_G(GALMPSC_RxC_ROUTE);
 631
 632         if (channel == 0)
 633                 temp |= brg;
 634         else
 635                 temp |= (brg << 8);
 636
 637         GT_REG_WRITE_MIRROR_G(GALMPSC_RxC_ROUTE,temp);
 638
 639         return 0;
 640 }
 641
 642 static int
 643 galmpsc_route_tx_clock(int channel, int brg)
 644 {
 645         unsigned int temp;
 646
 647         temp = GTREGREAD_MIRROR_G(GALMPSC_TxC_ROUTE);
 648
 649         if (channel == 0)
 650                 temp |= brg;
 651         else
 652                 temp |= (brg << 8);
 653
 654         GT_REG_WRITE_MIRROR_G(GALMPSC_TxC_ROUTE,temp);
 655
 656         return 0;
 657 }
 658
 659 static int
 660 galmpsc_write_config_regs(int mpsc, int mode)
 661 {
 662         if (mode == GALMPSC_UART) {
 663                 /* Main config reg Low (Null modem, Enable Tx/Rx, UART mode) */
 664                 GT_REG_WRITE(GALMPSC_MCONF_LOW + (mpsc*GALMPSC_REG_GAP),
 665                              0x000004c4);
 666
 667                 /* Main config reg High (32x Rx/Tx clock mode, width=8bits */
 668                 GT_REG_WRITE(GALMPSC_MCONF_HIGH +(mpsc*GALMPSC_REG_GAP),
 669                              0x024003f8);
 670                 /*        22 2222 1111 */
 671                 /*        54 3210 9876 */
 672                 /* 0000 0010 0000 0000 */
 673                 /*       1 */
 674                 /*       098 7654 3210 */
 675                 /* 0000 0011 1111 1000 */
 676         } else
 677                 return -1;
 678
 679         return 0;
 680 }
 681
 682 static int
 683 galmpsc_config_channel_regs(int mpsc)
 684 {
 685         GT_REG_WRITE_MIRROR(GALMPSC_CHANNELREG_1,mpsc,GALMPSC_REG_GAP, 0);
 686         GT_REG_WRITE_MIRROR(GALMPSC_CHANNELREG_2,mpsc,GALMPSC_REG_GAP, 0);
 687         GT_REG_WRITE(GALMPSC_CHANNELREG_3+(mpsc*GALMPSC_REG_GAP), 1);
 688         GT_REG_WRITE(GALMPSC_CHANNELREG_4+(mpsc*GALMPSC_REG_GAP), 0);
 689         GT_REG_WRITE(GALMPSC_CHANNELREG_5+(mpsc*GALMPSC_REG_GAP), 0);
 690         GT_REG_WRITE(GALMPSC_CHANNELREG_6+(mpsc*GALMPSC_REG_GAP), 0);
 691         GT_REG_WRITE(GALMPSC_CHANNELREG_7+(mpsc*GALMPSC_REG_GAP), 0);
 692         GT_REG_WRITE(GALMPSC_CHANNELREG_8+(mpsc*GALMPSC_REG_GAP), 0);
 693         GT_REG_WRITE(GALMPSC_CHANNELREG_9+(mpsc*GALMPSC_REG_GAP), 0);
 694         GT_REG_WRITE(GALMPSC_CHANNELREG_10+(mpsc*GALMPSC_REG_GAP), 0);
 695
 696         galmpsc_set_brkcnt(mpsc, 0x3);
 697         galmpsc_set_tcschar(mpsc, 0xab);
 698
 699         return 0;
 700 }
 701
 702 static int
 703 galmpsc_set_brkcnt(int mpsc, int value)
 704 {
 705         unsigned int temp;
 706
 707         temp = GTREGREAD_MIRROR(GALMPSC_CHANNELREG_1,mpsc,GALMPSC_REG_GAP);
 708         temp &= 0x0000FFFF;
 709         temp |= (value << 16);
 710         GT_REG_WRITE_MIRROR(GALMPSC_CHANNELREG_1,mpsc,GALMPSC_REG_GAP, temp);
 711
 712         return 0;
 713 }
 714
 715 static int
 716 galmpsc_set_tcschar(int mpsc, int value)
 717 {
 718         unsigned int temp;
 719
 720         temp = GTREGREAD_MIRROR(GALMPSC_CHANNELREG_1,mpsc,GALMPSC_REG_GAP);
 721         temp &= 0xFFFF0000;
 722         temp |= value;
 723         GT_REG_WRITE_MIRROR(GALMPSC_CHANNELREG_1,mpsc,GALMPSC_REG_GAP, temp);
 724
 725         return 0;
 726 }
 727
 728 static int
 729 galmpsc_set_char_length(int mpsc, int value)
 730 {
 731         unsigned int temp;
 732
 733         temp = GTREGREAD_MIRROR(GALMPSC_PROTOCONF_REG,mpsc,GALMPSC_REG_GAP);
 734         temp &= 0xFFFFCFFF;
 735         temp |= (value << 12);
 736         GT_REG_WRITE_MIRROR(GALMPSC_PROTOCONF_REG,mpsc,GALMPSC_REG_GAP, temp);
 737
 738         return 0;
 739 }
 740
 741 static int
 742 galmpsc_set_stop_bit_length(int mpsc, int value)
 743 {
 744         unsigned int temp;
 745
 746         temp = GTREGREAD_MIRROR(GALMPSC_PROTOCONF_REG,mpsc,GALMPSC_REG_GAP);
 747         temp |= (value << 14);
 748         GT_REG_WRITE_MIRROR(GALMPSC_PROTOCONF_REG,mpsc,GALMPSC_REG_GAP,temp);
 749
 750         return 0;
 751 }
 752
 753 static int
 754 galmpsc_set_parity(int mpsc, int value)
 755 {
 756         unsigned int temp;
 757
 758         temp = GTREGREAD_MIRROR(GALMPSC_CHANNELREG_2,mpsc,GALMPSC_REG_GAP);
 759         if (value != -1) {
 760                 temp &= 0xFFF3FFF3;
 761                 temp |= ((value << 18) | (value << 2));
 762                 temp |= ((value << 17) | (value << 1));
 763         } else {
 764                 temp &= 0xFFF1FFF1;
 765         }
 766
 767         GT_REG_WRITE_MIRROR(GALMPSC_CHANNELREG_2,mpsc,GALMPSC_REG_GAP, temp);
 768
 769         return 0;
 770 }
 771
 772 static int
 773 galmpsc_enter_hunt(int mpsc)
 774 {
 775         int temp;
 776
 777         temp = GTREGREAD_MIRROR(GALMPSC_CHANNELREG_2,mpsc,GALMPSC_REG_GAP);
 778         temp |= 0x80000000;
 779         GT_REG_WRITE_MIRROR(GALMPSC_CHANNELREG_2,mpsc,GALMPSC_REG_GAP, temp);
 780
 781         /* Should Poll on Enter Hunt bit, but the register is write-only */
 782         /* errata suggests pausing 100 system cycles */
 783         udelay(100);
 784
 785         return 0;
 786 }
 787
 788
 789 static int
 790 galmpsc_shutdown(int mpsc)
 791 {
 792 #if 0
 793         unsigned int temp;
 794
 795         /* cause RX abort (clears RX) */
 796         temp = GTREGREAD_MIRROR(GALMPSC_CHANNELREG_2,mpsc,GALMPSC_REG_GAP);
 797         temp |= MPSC_RX_ABORT | MPSC_TX_ABORT;
 798         temp &= ~MPSC_ENTER_HUNT;
 799         GT_REG_WRITE_MIRROR(GALMPSC_CHANNELREG_2,mpsc,GALMPSC_REG_GAP,temp);
 800 #endif
 801
 802         GT_REG_WRITE(GALSDMA_0_COM_REG + CHANNEL * GALSDMA_REG_DIFF, 0);
 803         GT_REG_WRITE(GALSDMA_0_COM_REG + CHANNEL * GALSDMA_REG_DIFF,
 804                      SDMA_TX_ABORT | SDMA_RX_ABORT);
 805
 806         /* shut down the MPSC */
 807         GT_REG_WRITE(GALMPSC_MCONF_LOW, 0);
 808         GT_REG_WRITE(GALMPSC_MCONF_HIGH, 0);
 809         GT_REG_WRITE_MIRROR(GALMPSC_PROTOCONF_REG, mpsc, GALMPSC_REG_GAP,0);
 810
 811         udelay(100);
 812
 813         /* shut down the sdma engines. */
 814         /* reset config to default */
 815         GT_REG_WRITE(GALSDMA_0_CONF_REG + CHANNEL * GALSDMA_REG_DIFF,
 816                      0x000000fc);
 817
 818         udelay(100);
 819
 820         /* clear the SDMA current and first TX and RX pointers */
 821         GT_REG_WRITE(GALSDMA_0_CUR_RX_PTR + CHANNEL * GALSDMA_REG_DIFF, 0);
 822         GT_REG_WRITE(GALSDMA_0_CUR_TX_PTR + CHANNEL * GALSDMA_REG_DIFF, 0);
 823         GT_REG_WRITE(GALSDMA_0_FIR_TX_PTR + CHANNEL * GALSDMA_REG_DIFF, 0);
 824
 825         udelay(100);
 826
 827         return 0;
 828 }
 829
 830 static void
 831 galsdma_enable_rx(void)
 832 {
 833         int temp;
 834
 835         /* Enable RX processing */
 836         temp = GTREGREAD(GALSDMA_0_COM_REG+(CHANNEL*GALSDMA_REG_DIFF));
 837         temp |= RX_ENABLE;
 838         GT_REG_WRITE(GALSDMA_0_COM_REG+(CHANNEL*GALSDMA_REG_DIFF), temp);
 839
 840         galmpsc_enter_hunt(CHANNEL);
 841 }
 842
 843 static int
 844 galmpsc_set_snoop(int mpsc, int value)
 845 {
 846         int reg = mpsc ? MPSC_1_ADDRESS_CONTROL_LOW : MPSC_0_ADDRESS_CONTROL_LOW;
 847         int temp=GTREGREAD(reg);
 848         if(value)
 849             temp |= (1<< 6) | (1<<14) | (1<<22) | (1<<30);
 850         else
 851             temp &= ~((1<< 6) | (1<<14) | (1<<22) | (1<<30));
 852         GT_REG_WRITE(reg, temp);
 853         return 0;
 854 }