arch/powerpc/cpu/mpc8260/serial_scc.c

   1 /*
   2  * (C) Copyright 2000
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   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  * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00.
  24  */
  25
  26 /*
  27  * Minimal serial functions needed to use one of the SCC ports
  28  * as serial console interface.
  29  */
  30
  31 #include <common.h>
  32 #include <mpc8260.h>
  33 #include <asm/cpm_8260.h>
  34
  35 DECLARE_GLOBAL_DATA_PTR;
  36
  37 #if defined(CONFIG_CONS_ON_SCC)
  38
  39 #if CONFIG_CONS_INDEX == 1      /* Console on SCC1 */
  40
  41 #define SCC_INDEX               0
  42 #define PROFF_SCC               PROFF_SCC1
  43 #define CMXSCR_MASK             (CMXSCR_GR1|CMXSCR_SC1|\
  44                                         CMXSCR_RS1CS_MSK|CMXSCR_TS1CS_MSK)
  45 #define CMXSCR_VALUE            (CMXSCR_RS1CS_BRG1|CMXSCR_TS1CS_BRG1)
  46 #define CPM_CR_SCC_PAGE         CPM_CR_SCC1_PAGE
  47 #define CPM_CR_SCC_SBLOCK       CPM_CR_SCC1_SBLOCK
  48
  49 #elif CONFIG_CONS_INDEX == 2    /* Console on SCC2 */
  50
  51 #define SCC_INDEX               1
  52 #define PROFF_SCC               PROFF_SCC2
  53 #define CMXSCR_MASK             (CMXSCR_GR2|CMXSCR_SC2|\
  54                                         CMXSCR_RS2CS_MSK|CMXSCR_TS2CS_MSK)
  55 #define CMXSCR_VALUE            (CMXSCR_RS2CS_BRG2|CMXSCR_TS2CS_BRG2)
  56 #define CPM_CR_SCC_PAGE         CPM_CR_SCC2_PAGE
  57 #define CPM_CR_SCC_SBLOCK       CPM_CR_SCC2_SBLOCK
  58
  59 #elif CONFIG_CONS_INDEX == 3    /* Console on SCC3 */
  60
  61 #define SCC_INDEX               2
  62 #define PROFF_SCC               PROFF_SCC3
  63 #define CMXSCR_MASK             (CMXSCR_GR3|CMXSCR_SC3|\
  64                                         CMXSCR_RS3CS_MSK|CMXSCR_TS3CS_MSK)
  65 #define CMXSCR_VALUE            (CMXSCR_RS3CS_BRG3|CMXSCR_TS3CS_BRG3)
  66 #define CPM_CR_SCC_PAGE         CPM_CR_SCC3_PAGE
  67 #define CPM_CR_SCC_SBLOCK       CPM_CR_SCC3_SBLOCK
  68
  69 #elif CONFIG_CONS_INDEX == 4    /* Console on SCC4 */
  70
  71 #define SCC_INDEX               3
  72 #define PROFF_SCC               PROFF_SCC4
  73 #define CMXSCR_MASK             (CMXSCR_GR4|CMXSCR_SC4|\
  74                                         CMXSCR_RS4CS_MSK|CMXSCR_TS4CS_MSK)
  75 #define CMXSCR_VALUE            (CMXSCR_RS4CS_BRG4|CMXSCR_TS4CS_BRG4)
  76 #define CPM_CR_SCC_PAGE         CPM_CR_SCC4_PAGE
  77 #define CPM_CR_SCC_SBLOCK       CPM_CR_SCC4_SBLOCK
  78
  79 #else
  80
  81 #error "console not correctly defined"
  82
  83 #endif
  84
  85 int serial_init (void)
  86 {
  87         volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
  88         volatile scc_t *sp;
  89         volatile scc_uart_t *up;
  90         volatile cbd_t *tbdf, *rbdf;
  91         volatile cpm8260_t *cp = &(im->im_cpm);
  92         uint    dpaddr;
  93
  94         /* initialize pointers to SCC */
  95
  96         sp = (scc_t *) &(im->im_scc[SCC_INDEX]);
  97         up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
  98
  99         /* Disable transmitter/receiver.
 100         */
 101         sp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 102
 103         /* put the SCC channel into NMSI (non multiplexd serial interface)
 104          * mode and wire the selected SCC Tx and Rx clocks to BRGx (15-15).
 105          */
 106         im->im_cpmux.cmx_scr = (im->im_cpmux.cmx_scr&~CMXSCR_MASK)|CMXSCR_VALUE;
 107
 108         /* Set up the baud rate generator.
 109         */
 110         serial_setbrg ();
 111
 112         /* Allocate space for two buffer descriptors in the DP ram.
 113          * damm: allocating space after the two buffers for rx/tx data
 114          */
 115
 116         dpaddr = m8260_cpm_dpalloc((2 * sizeof (cbd_t)) + 2, 16);
 117
 118         /* Set the physical address of the host memory buffers in
 119          * the buffer descriptors.
 120          */
 121         rbdf = (cbd_t *)&im->im_dprambase[dpaddr];
 122         rbdf->cbd_bufaddr = (uint) (rbdf+2);
 123         rbdf->cbd_sc = BD_SC_EMPTY | BD_SC_WRAP;
 124         tbdf = rbdf + 1;
 125         tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1;
 126         tbdf->cbd_sc = BD_SC_WRAP;
 127
 128         /* Set up the uart parameters in the parameter ram.
 129         */
 130         up->scc_genscc.scc_rbase = dpaddr;
 131         up->scc_genscc.scc_tbase = dpaddr+sizeof(cbd_t);
 132         up->scc_genscc.scc_rfcr = CPMFCR_EB;
 133         up->scc_genscc.scc_tfcr = CPMFCR_EB;
 134         up->scc_genscc.scc_mrblr = 1;
 135         up->scc_maxidl = 0;
 136         up->scc_brkcr = 1;
 137         up->scc_parec = 0;
 138         up->scc_frmec = 0;
 139         up->scc_nosec = 0;
 140         up->scc_brkec = 0;
 141         up->scc_uaddr1 = 0;
 142         up->scc_uaddr2 = 0;
 143         up->scc_toseq = 0;
 144         up->scc_char1 = up->scc_char2 = up->scc_char3 = up->scc_char4 = 0x8000;
 145         up->scc_char5 = up->scc_char6 = up->scc_char7 = up->scc_char8 = 0x8000;
 146         up->scc_rccm = 0xc0ff;
 147
 148         /* Mask all interrupts and remove anything pending.
 149         */
 150         sp->scc_sccm = 0;
 151         sp->scc_scce = 0xffff;
 152
 153         /* Set 8 bit FIFO, 16 bit oversampling and UART mode.
 154         */
 155         sp->scc_gsmrh = SCC_GSMRH_RFW;  /* 8 bit FIFO */
 156         sp->scc_gsmrl = \
 157                 SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16 | SCC_GSMRL_MODE_UART;
 158
 159         /* Set CTS flow control, 1 stop bit, 8 bit character length,
 160          * normal async UART mode, no parity
 161          */
 162         sp->scc_psmr = SCU_PSMR_FLC | SCU_PSMR_CL;
 163
 164         /* execute the "Init Rx and Tx params" CP command.
 165         */
 166
 167         while (cp->cp_cpcr & CPM_CR_FLG)  /* wait if cp is busy */
 168           ;
 169
 170         cp->cp_cpcr = mk_cr_cmd(CPM_CR_SCC_PAGE, CPM_CR_SCC_SBLOCK,
 171                                         0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
 172
 173         while (cp->cp_cpcr & CPM_CR_FLG)  /* wait if cp is busy */
 174           ;
 175
 176         /* Enable transmitter/receiver.
 177         */
 178         sp->scc_gsmrl |= SCC_GSMRL_ENR | SCC_GSMRL_ENT;
 179
 180         return (0);
 181 }
 182
 183 void
 184 serial_setbrg (void)
 185 {
 186 #if defined(CONFIG_CONS_USE_EXTC)
 187         m8260_cpm_extcbrg(SCC_INDEX, gd->baudrate,
 188                 CONFIG_CONS_EXTC_RATE, CONFIG_CONS_EXTC_PINSEL);
 189 #else
 190         m8260_cpm_setbrg(SCC_INDEX, gd->baudrate);
 191 #endif
 192 }
 193
 194 void
 195 serial_putc(const char c)
 196 {
 197         volatile scc_uart_t     *up;
 198         volatile cbd_t          *tbdf;
 199         volatile immap_t        *im;
 200
 201         if (c == '\n')
 202                 serial_putc ('\r');
 203
 204         im = (immap_t *)CONFIG_SYS_IMMR;
 205         up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
 206         tbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_tbase];
 207
 208         /* Wait for last character to go.
 209          */
 210         while (tbdf->cbd_sc & BD_SC_READY)
 211                 ;
 212
 213         /* Load the character into the transmit buffer.
 214          */
 215         *(volatile char *)tbdf->cbd_bufaddr = c;
 216         tbdf->cbd_datlen = 1;
 217         tbdf->cbd_sc |= BD_SC_READY;
 218 }
 219
 220 void
 221 serial_puts (const char *s)
 222 {
 223         while (*s) {
 224                 serial_putc (*s++);
 225         }
 226 }
 227
 228 int
 229 serial_getc(void)
 230 {
 231         volatile cbd_t          *rbdf;
 232         volatile scc_uart_t     *up;
 233         volatile immap_t        *im;
 234         unsigned char           c;
 235
 236         im = (immap_t *)CONFIG_SYS_IMMR;
 237         up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
 238         rbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_rbase];
 239
 240         /* Wait for character to show up.
 241          */
 242         while (rbdf->cbd_sc & BD_SC_EMPTY)
 243                 ;
 244
 245         /* Grab the char and clear the buffer again.
 246          */
 247         c = *(volatile unsigned char *)rbdf->cbd_bufaddr;
 248         rbdf->cbd_sc |= BD_SC_EMPTY;
 249
 250         return (c);
 251 }
 252
 253 int
 254 serial_tstc()
 255 {
 256         volatile cbd_t          *rbdf;
 257         volatile scc_uart_t     *up;
 258         volatile immap_t        *im;
 259
 260         im = (immap_t *)CONFIG_SYS_IMMR;
 261         up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
 262         rbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_rbase];
 263
 264         return ((rbdf->cbd_sc & BD_SC_EMPTY) == 0);
 265 }
 266
 267 #endif  /* CONFIG_CONS_ON_SCC */
 268
 269 #if defined(CONFIG_KGDB_ON_SCC)
 270
 271 #if defined(CONFIG_CONS_ON_SCC) && CONFIG_KGDB_INDEX == CONFIG_CONS_INDEX
 272 #error Whoops! serial console and kgdb are on the same scc serial port
 273 #endif
 274
 275 #if CONFIG_KGDB_INDEX == 1      /* KGDB Port on SCC1 */
 276
 277 #define KGDB_SCC_INDEX          0
 278 #define KGDB_PROFF_SCC          PROFF_SCC1
 279 #define KGDB_CMXSCR_MASK        (CMXSCR_GR1|CMXSCR_SC1|\
 280                                         CMXSCR_RS1CS_MSK|CMXSCR_TS1CS_MSK)
 281 #define KGDB_CMXSCR_VALUE       (CMXSCR_RS1CS_BRG1|CMXSCR_TS1CS_BRG1)
 282 #define KGDB_CPM_CR_SCC_PAGE    CPM_CR_SCC1_PAGE
 283 #define KGDB_CPM_CR_SCC_SBLOCK  CPM_CR_SCC1_SBLOCK
 284
 285 #elif CONFIG_KGDB_INDEX == 2    /* KGDB Port on SCC2 */
 286
 287 #define KGDB_SCC_INDEX          1
 288 #define KGDB_PROFF_SCC          PROFF_SCC2
 289 #define KGDB_CMXSCR_MASK        (CMXSCR_GR2|CMXSCR_SC2|\
 290                                         CMXSCR_RS2CS_MSK|CMXSCR_TS2CS_MSK)
 291 #define KGDB_CMXSCR_VALUE       (CMXSCR_RS2CS_BRG2|CMXSCR_TS2CS_BRG2)
 292 #define KGDB_CPM_CR_SCC_PAGE    CPM_CR_SCC2_PAGE
 293 #define KGDB_CPM_CR_SCC_SBLOCK  CPM_CR_SCC2_SBLOCK
 294
 295 #elif CONFIG_KGDB_INDEX == 3    /* KGDB Port on SCC3 */
 296
 297 #define KGDB_SCC_INDEX          2
 298 #define KGDB_PROFF_SCC          PROFF_SCC3
 299 #define KGDB_CMXSCR_MASK        (CMXSCR_GR3|CMXSCR_SC3|\
 300                                         CMXSCR_RS3CS_MSK|CMXSCR_TS3CS_MSK)
 301 #define KGDB_CMXSCR_VALUE       (CMXSCR_RS3CS_BRG3|CMXSCR_TS3CS_BRG3)
 302 #define KGDB_CPM_CR_SCC_PAGE    CPM_CR_SCC3_PAGE
 303 #define KGDB_CPM_CR_SCC_SBLOCK  CPM_CR_SCC3_SBLOCK
 304
 305 #elif CONFIG_KGDB_INDEX == 4    /* KGDB Port on SCC4 */
 306
 307 #define KGDB_SCC_INDEX          3
 308 #define KGDB_PROFF_SCC          PROFF_SCC4
 309 #define KGDB_CMXSCR_MASK        (CMXSCR_GR4|CMXSCR_SC4|\
 310                                         CMXSCR_RS4CS_MSK|CMXSCR_TS4CS_MSK)
 311 #define KGDB_CMXSCR_VALUE       (CMXSCR_RS4CS_BRG4|CMXSCR_TS4CS_BRG4)
 312 #define KGDB_CPM_CR_SCC_PAGE    CPM_CR_SCC4_PAGE
 313 #define KGDB_CPM_CR_SCC_SBLOCK  CPM_CR_SCC4_SBLOCK
 314
 315 #else
 316
 317 #error "kgdb serial port not correctly defined"
 318
 319 #endif
 320
 321 void
 322 kgdb_serial_init (void)
 323 {
 324         volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
 325         volatile scc_t *sp;
 326         volatile scc_uart_t *up;
 327         volatile cbd_t *tbdf, *rbdf;
 328         volatile cpm8260_t *cp = &(im->im_cpm);
 329         uint dpaddr, speed = CONFIG_KGDB_BAUDRATE;
 330         char *s, *e;
 331
 332         if ((s = getenv("kgdbrate")) != NULL && *s != '\0') {
 333                 ulong rate = simple_strtoul(s, &e, 10);
 334                 if (e > s && *e == '\0')
 335                         speed = rate;
 336         }
 337
 338         /* initialize pointers to SCC */
 339
 340         sp = (scc_t *) &(im->im_scc[KGDB_SCC_INDEX]);
 341         up = (scc_uart_t *)&im->im_dprambase[KGDB_PROFF_SCC];
 342
 343         /* Disable transmitter/receiver.
 344         */
 345         sp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 346
 347         /* put the SCC channel into NMSI (non multiplexd serial interface)
 348          * mode and wire the selected SCC Tx and Rx clocks to BRGx (15-15).
 349          */
 350         im->im_cpmux.cmx_scr = \
 351                 (im->im_cpmux.cmx_scr & ~KGDB_CMXSCR_MASK) | KGDB_CMXSCR_VALUE;
 352
 353         /* Set up the baud rate generator.
 354         */
 355 #if defined(CONFIG_KGDB_USE_EXTC)
 356         m8260_cpm_extcbrg(KGDB_SCC_INDEX, speed,
 357                 CONFIG_KGDB_EXTC_RATE, CONFIG_KGDB_EXTC_PINSEL);
 358 #else
 359         m8260_cpm_setbrg(KGDB_SCC_INDEX, speed);
 360 #endif
 361
 362         /* Allocate space for two buffer descriptors in the DP ram.
 363          * damm: allocating space after the two buffers for rx/tx data
 364          */
 365
 366         dpaddr = m8260_cpm_dpalloc((2 * sizeof (cbd_t)) + 2, 16);
 367
 368         /* Set the physical address of the host memory buffers in
 369          * the buffer descriptors.
 370          */
 371         rbdf = (cbd_t *)&im->im_dprambase[dpaddr];
 372         rbdf->cbd_bufaddr = (uint) (rbdf+2);
 373         rbdf->cbd_sc = BD_SC_EMPTY | BD_SC_WRAP;
 374         tbdf = rbdf + 1;
 375         tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1;
 376         tbdf->cbd_sc = BD_SC_WRAP;
 377
 378         /* Set up the uart parameters in the parameter ram.
 379         */
 380         up->scc_genscc.scc_rbase = dpaddr;
 381         up->scc_genscc.scc_tbase = dpaddr+sizeof(cbd_t);
 382         up->scc_genscc.scc_rfcr = CPMFCR_EB;
 383         up->scc_genscc.scc_tfcr = CPMFCR_EB;
 384         up->scc_genscc.scc_mrblr = 1;
 385         up->scc_maxidl = 0;
 386         up->scc_brkcr = 1;
 387         up->scc_parec = 0;
 388         up->scc_frmec = 0;
 389         up->scc_nosec = 0;
 390         up->scc_brkec = 0;
 391         up->scc_uaddr1 = 0;
 392         up->scc_uaddr2 = 0;
 393         up->scc_toseq = 0;
 394         up->scc_char1 = up->scc_char2 = up->scc_char3 = up->scc_char4 = 0x8000;
 395         up->scc_char5 = up->scc_char6 = up->scc_char7 = up->scc_char8 = 0x8000;
 396         up->scc_rccm = 0xc0ff;
 397
 398         /* Mask all interrupts and remove anything pending.
 399         */
 400         sp->scc_sccm = 0;
 401         sp->scc_scce = 0xffff;
 402
 403         /* Set 8 bit FIFO, 16 bit oversampling and UART mode.
 404         */
 405         sp->scc_gsmrh = SCC_GSMRH_RFW;  /* 8 bit FIFO */
 406         sp->scc_gsmrl = \
 407                 SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16 | SCC_GSMRL_MODE_UART;
 408
 409         /* Set CTS flow control, 1 stop bit, 8 bit character length,
 410          * normal async UART mode, no parity
 411          */
 412         sp->scc_psmr = SCU_PSMR_FLC | SCU_PSMR_CL;
 413
 414         /* execute the "Init Rx and Tx params" CP command.
 415         */
 416
 417         while (cp->cp_cpcr & CPM_CR_FLG)  /* wait if cp is busy */
 418           ;
 419
 420         cp->cp_cpcr = mk_cr_cmd(KGDB_CPM_CR_SCC_PAGE, KGDB_CPM_CR_SCC_SBLOCK,
 421                                         0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
 422
 423         while (cp->cp_cpcr & CPM_CR_FLG)  /* wait if cp is busy */
 424           ;
 425
 426         /* Enable transmitter/receiver.
 427         */
 428         sp->scc_gsmrl |= SCC_GSMRL_ENR | SCC_GSMRL_ENT;
 429
 430         printf("SCC%d at %dbps ", CONFIG_KGDB_INDEX, speed);
 431 }
 432
 433 void
 434 putDebugChar(const char c)
 435 {
 436         volatile scc_uart_t     *up;
 437         volatile cbd_t          *tbdf;
 438         volatile immap_t        *im;
 439
 440         if (c == '\n')
 441                 putDebugChar ('\r');
 442
 443         im = (immap_t *)CONFIG_SYS_IMMR;
 444         up = (scc_uart_t *)&im->im_dprambase[KGDB_PROFF_SCC];
 445         tbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_tbase];
 446
 447         /* Wait for last character to go.
 448          */
 449         while (tbdf->cbd_sc & BD_SC_READY)
 450                 ;
 451
 452         /* Load the character into the transmit buffer.
 453          */
 454         *(volatile char *)tbdf->cbd_bufaddr = c;
 455         tbdf->cbd_datlen = 1;
 456         tbdf->cbd_sc |= BD_SC_READY;
 457 }
 458
 459 void
 460 putDebugStr (const char *s)
 461 {
 462         while (*s) {
 463                 putDebugChar (*s++);
 464         }
 465 }
 466
 467 int
 468 getDebugChar(void)
 469 {
 470         volatile cbd_t          *rbdf;
 471         volatile scc_uart_t     *up;
 472         volatile immap_t        *im;
 473         unsigned char           c;
 474
 475         im = (immap_t *)CONFIG_SYS_IMMR;
 476         up = (scc_uart_t *)&im->im_dprambase[KGDB_PROFF_SCC];
 477         rbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_rbase];
 478
 479         /* Wait for character to show up.
 480          */
 481         while (rbdf->cbd_sc & BD_SC_EMPTY)
 482                 ;
 483
 484         /* Grab the char and clear the buffer again.
 485          */
 486         c = *(volatile unsigned char *)rbdf->cbd_bufaddr;
 487         rbdf->cbd_sc |= BD_SC_EMPTY;
 488
 489         return (c);
 490 }
 491
 492 void
 493 kgdb_interruptible(int yes)
 494 {
 495         return;
 496 }
 497
 498 #endif  /* CONFIG_KGDB_ON_SCC */