cpu/mpc8260/serial_smc.c

   1 /*
   2  * (C) Copyright 2000, 2001, 2002
   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, with
  24  * changes based on the file arch/ppc/mbxboot/m8260_tty.c from the
  25  * Linux/PPC sources (m8260_tty.c had no copyright info in it).
  26  */
  27
  28 /*
  29  * Minimal serial functions needed to use one of the SMC ports
  30  * as serial console interface.
  31  */
  32
  33 #include <common.h>
  34 #include <mpc8260.h>
  35 #include <asm/cpm_8260.h>
  36
  37 #if defined(CONFIG_CONS_ON_SMC)
  38
  39 #if CONFIG_CONS_INDEX == 1      /* Console on SMC1 */
  40
  41 #define SMC_INDEX               0
  42 #define PROFF_SMC_BASE          PROFF_SMC1_BASE
  43 #define PROFF_SMC               PROFF_SMC1
  44 #define CPM_CR_SMC_PAGE         CPM_CR_SMC1_PAGE
  45 #define CPM_CR_SMC_SBLOCK       CPM_CR_SMC1_SBLOCK
  46 #define CMXSMR_MASK             (CMXSMR_SMC1|CMXSMR_SMC1CS_MSK)
  47 #define CMXSMR_VALUE            CMXSMR_SMC1CS_BRG7
  48
  49 #elif CONFIG_CONS_INDEX == 2    /* Console on SMC2 */
  50
  51 #define SMC_INDEX               1
  52 #define PROFF_SMC_BASE          PROFF_SMC2_BASE
  53 #define PROFF_SMC               PROFF_SMC2
  54 #define CPM_CR_SMC_PAGE         CPM_CR_SMC2_PAGE
  55 #define CPM_CR_SMC_SBLOCK       CPM_CR_SMC2_SBLOCK
  56 #define CMXSMR_MASK             (CMXSMR_SMC2|CMXSMR_SMC2CS_MSK)
  57 #define CMXSMR_VALUE            CMXSMR_SMC2CS_BRG8
  58
  59 #else
  60
  61 #error "console not correctly defined"
  62
  63 #endif
  64
  65 /* map rs_table index to baud rate generator index */
  66 static unsigned char brg_map[] = {
  67         6,      /* BRG7 for SMC1 */
  68         7,      /* BRG8 for SMC2 */
  69         0,      /* BRG1 for SCC1 */
  70         1,      /* BRG1 for SCC2 */
  71         2,      /* BRG1 for SCC3 */
  72         3,      /* BRG1 for SCC4 */
  73 };
  74
  75 int serial_init (void)
  76 {
  77         volatile immap_t *im = (immap_t *)CFG_IMMR;
  78         volatile smc_t *sp;
  79         volatile smc_uart_t *up;
  80         volatile cbd_t *tbdf, *rbdf;
  81         volatile cpm8260_t *cp = &(im->im_cpm);
  82         uint    dpaddr;
  83
  84         /* initialize pointers to SMC */
  85
  86         sp = (smc_t *) &(im->im_smc[SMC_INDEX]);
  87         *(ushort *)(&im->im_dprambase[PROFF_SMC_BASE]) = PROFF_SMC;
  88         up = (smc_uart_t *)&im->im_dprambase[PROFF_SMC];
  89
  90         /* Disable transmitter/receiver.
  91         */
  92         sp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
  93
  94         /* NOTE: I/O port pins are set up via the iop_conf_tab[] table */
  95
  96         /* Allocate space for two buffer descriptors in the DP ram.
  97          * damm: allocating space after the two buffers for rx/tx data
  98          */
  99
 100         dpaddr = m8260_cpm_dpalloc((2 * sizeof (cbd_t)) + 2, 16);
 101
 102         /* Set the physical address of the host memory buffers in
 103          * the buffer descriptors.
 104          */
 105         rbdf = (cbd_t *)&im->im_dprambase[dpaddr];
 106         rbdf->cbd_bufaddr = (uint) (rbdf+2);
 107         rbdf->cbd_sc = 0;
 108         tbdf = rbdf + 1;
 109         tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1;
 110         tbdf->cbd_sc = 0;
 111
 112         /* Set up the uart parameters in the parameter ram.
 113         */
 114         up->smc_rbase = dpaddr;
 115         up->smc_tbase = dpaddr+sizeof(cbd_t);
 116         up->smc_rfcr = CPMFCR_EB;
 117         up->smc_tfcr = CPMFCR_EB;
 118         up->smc_brklen = 0;
 119         up->smc_brkec = 0;
 120         up->smc_brkcr = 0;
 121
 122         /* Set UART mode, 8 bit, no parity, one stop.
 123          * Enable receive and transmit.
 124          */
 125         sp->smc_smcmr = smcr_mk_clen(9) |  SMCMR_SM_UART;
 126
 127         /* Mask all interrupts and remove anything pending.
 128         */
 129         sp->smc_smcm = 0;
 130         sp->smc_smce = 0xff;
 131
 132         /* put the SMC channel into NMSI (non multiplexd serial interface)
 133          * mode and wire either BRG7 to SMC1 or BRG8 to SMC2 (15-17).
 134          */
 135         im->im_cpmux.cmx_smr = (im->im_cpmux.cmx_smr&~CMXSMR_MASK)|CMXSMR_VALUE;
 136
 137         /* Set up the baud rate generator.
 138         */
 139         serial_setbrg ();
 140
 141         /* Make the first buffer the only buffer.
 142         */
 143         tbdf->cbd_sc |= BD_SC_WRAP;
 144         rbdf->cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP;
 145
 146         /* Single character receive.
 147         */
 148         up->smc_mrblr = 1;
 149         up->smc_maxidl = 0;
 150
 151         /* Initialize Tx/Rx parameters.
 152         */
 153
 154         while (cp->cp_cpcr & CPM_CR_FLG)  /* wait if cp is busy */
 155           ;
 156
 157         cp->cp_cpcr = mk_cr_cmd(CPM_CR_SMC_PAGE, CPM_CR_SMC_SBLOCK,
 158                                         0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
 159
 160         while (cp->cp_cpcr & CPM_CR_FLG)  /* wait if cp is busy */
 161           ;
 162
 163         /* Enable transmitter/receiver.
 164         */
 165         sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
 166
 167         return (0);
 168 }
 169
 170 void
 171 serial_setbrg (void)
 172 {
 173         DECLARE_GLOBAL_DATA_PTR;
 174
 175 #if defined(CONFIG_CONS_USE_EXTC)
 176         m8260_cpm_extcbrg(brg_map[SMC_INDEX], gd->baudrate,
 177                 CONFIG_CONS_EXTC_RATE, CONFIG_CONS_EXTC_PINSEL);
 178 #else
 179         m8260_cpm_setbrg(brg_map[SMC_INDEX], gd->baudrate);
 180 #endif
 181 }
 182
 183 void
 184 serial_putc(const char c)
 185 {
 186         volatile cbd_t          *tbdf;
 187         volatile char           *buf;
 188         volatile smc_uart_t     *up;
 189         volatile immap_t        *im = (immap_t *)CFG_IMMR;
 190
 191         if (c == '\n')
 192                 serial_putc ('\r');
 193
 194         up = (smc_uart_t *)&(im->im_dprambase[PROFF_SMC]);
 195
 196         tbdf = (cbd_t *)&im->im_dprambase[up->smc_tbase];
 197
 198         /* Wait for last character to go.
 199         */
 200         buf = (char *)tbdf->cbd_bufaddr;
 201         while (tbdf->cbd_sc & BD_SC_READY)
 202                 ;
 203
 204         *buf = c;
 205         tbdf->cbd_datlen = 1;
 206         tbdf->cbd_sc |= BD_SC_READY;
 207 }
 208
 209 void
 210 serial_puts (const char *s)
 211 {
 212         while (*s) {
 213                 serial_putc (*s++);
 214         }
 215 }
 216
 217 int
 218 serial_getc(void)
 219 {
 220         volatile cbd_t          *rbdf;
 221         volatile unsigned char  *buf;
 222         volatile smc_uart_t     *up;
 223         volatile immap_t        *im = (immap_t *)CFG_IMMR;
 224         unsigned char           c;
 225
 226         up = (smc_uart_t *)&(im->im_dprambase[PROFF_SMC]);
 227
 228         rbdf = (cbd_t *)&im->im_dprambase[up->smc_rbase];
 229
 230         /* Wait for character to show up.
 231         */
 232         buf = (unsigned char *)rbdf->cbd_bufaddr;
 233         while (rbdf->cbd_sc & BD_SC_EMPTY)
 234                 ;
 235         c = *buf;
 236         rbdf->cbd_sc |= BD_SC_EMPTY;
 237
 238         return(c);
 239 }
 240
 241 int
 242 serial_tstc()
 243 {
 244         volatile cbd_t          *rbdf;
 245         volatile smc_uart_t     *up;
 246         volatile immap_t        *im = (immap_t *)CFG_IMMR;
 247
 248         up = (smc_uart_t *)&(im->im_dprambase[PROFF_SMC]);
 249
 250         rbdf = (cbd_t *)&im->im_dprambase[up->smc_rbase];
 251
 252         return(!(rbdf->cbd_sc & BD_SC_EMPTY));
 253 }
 254
 255 #endif  /* CONFIG_CONS_ON_SMC */
 256
 257 #if defined(CONFIG_KGDB_ON_SMC)
 258
 259 #if defined(CONFIG_CONS_ON_SMC) && CONFIG_KGDB_INDEX == CONFIG_CONS_INDEX
 260 #error Whoops! serial console and kgdb are on the same smc serial port
 261 #endif
 262
 263 #if CONFIG_KGDB_INDEX == 1      /* KGDB Port on SMC1 */
 264
 265 #define KGDB_SMC_INDEX          0
 266 #define KGDB_PROFF_SMC_BASE     PROFF_SMC1_BASE
 267 #define KGDB_PROFF_SMC          PROFF_SMC1
 268 #define KGDB_CPM_CR_SMC_PAGE    CPM_CR_SMC1_PAGE
 269 #define KGDB_CPM_CR_SMC_SBLOCK  CPM_CR_SMC1_SBLOCK
 270 #define KGDB_CMXSMR_MASK        (CMXSMR_SMC1|CMXSMR_SMC1CS_MSK)
 271 #define KGDB_CMXSMR_VALUE       CMXSMR_SMC1CS_BRG7
 272
 273 #elif CONFIG_KGDB_INDEX == 2    /* KGDB Port on SMC2 */
 274
 275 #define KGDB_SMC_INDEX          1
 276 #define KGDB_PROFF_SMC_BASE     PROFF_SMC2_BASE
 277 #define KGDB_PROFF_SMC          PROFF_SMC2
 278 #define KGDB_CPM_CR_SMC_PAGE    CPM_CR_SMC2_PAGE
 279 #define KGDB_CPM_CR_SMC_SBLOCK  CPM_CR_SMC2_SBLOCK
 280 #define KGDB_CMXSMR_MASK        (CMXSMR_SMC2|CMXSMR_SMC2CS_MSK)
 281 #define KGDB_CMXSMR_VALUE       CMXSMR_SMC2CS_BRG8
 282
 283 #else
 284
 285 #error "console not correctly defined"
 286
 287 #endif
 288
 289 void
 290 kgdb_serial_init (void)
 291 {
 292         volatile immap_t *im = (immap_t *)CFG_IMMR;
 293         volatile smc_t *sp;
 294         volatile smc_uart_t *up;
 295         volatile cbd_t *tbdf, *rbdf;
 296         volatile cpm8260_t *cp = &(im->im_cpm);
 297         uint dpaddr, speed = CONFIG_KGDB_BAUDRATE;
 298         char *s, *e;
 299
 300         if ((s = getenv("kgdbrate")) != NULL && *s != '\0') {
 301                 ulong rate = simple_strtoul(s, &e, 10);
 302                 if (e > s && *e == '\0')
 303                         speed = rate;
 304         }
 305
 306         /* initialize pointers to SMC */
 307
 308         sp = (smc_t *) &(im->im_smc[KGDB_SMC_INDEX]);
 309         *(ushort *)(&im->im_dprambase[KGDB_PROFF_SMC_BASE]) = KGDB_PROFF_SMC;
 310         up = (smc_uart_t *)&im->im_dprambase[KGDB_PROFF_SMC];
 311
 312         /* Disable transmitter/receiver.
 313         */
 314         sp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 315
 316         /* NOTE: I/O port pins are set up via the iop_conf_tab[] table */
 317
 318         /* Allocate space for two buffer descriptors in the DP ram.
 319          * damm: allocating space after the two buffers for rx/tx data
 320          */
 321
 322         dpaddr = m8260_cpm_dpalloc((2 * sizeof (cbd_t)) + 2, 16);
 323
 324         /* Set the physical address of the host memory buffers in
 325          * the buffer descriptors.
 326          */
 327         rbdf = (cbd_t *)&im->im_dprambase[dpaddr];
 328         rbdf->cbd_bufaddr = (uint) (rbdf+2);
 329         rbdf->cbd_sc = 0;
 330         tbdf = rbdf + 1;
 331         tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1;
 332         tbdf->cbd_sc = 0;
 333
 334         /* Set up the uart parameters in the parameter ram.
 335         */
 336         up->smc_rbase = dpaddr;
 337         up->smc_tbase = dpaddr+sizeof(cbd_t);
 338         up->smc_rfcr = CPMFCR_EB;
 339         up->smc_tfcr = CPMFCR_EB;
 340         up->smc_brklen = 0;
 341         up->smc_brkec = 0;
 342         up->smc_brkcr = 0;
 343
 344         /* Set UART mode, 8 bit, no parity, one stop.
 345          * Enable receive and transmit.
 346          */
 347         sp->smc_smcmr = smcr_mk_clen(9) |  SMCMR_SM_UART;
 348
 349         /* Mask all interrupts and remove anything pending.
 350         */
 351         sp->smc_smcm = 0;
 352         sp->smc_smce = 0xff;
 353
 354         /* put the SMC channel into NMSI (non multiplexd serial interface)
 355          * mode and wire either BRG7 to SMC1 or BRG8 to SMC2 (15-17).
 356          */
 357         im->im_cpmux.cmx_smr =
 358                 (im->im_cpmux.cmx_smr & ~KGDB_CMXSMR_MASK) | KGDB_CMXSMR_VALUE;
 359
 360         /* Set up the baud rate generator.
 361         */
 362 #if defined(CONFIG_KGDB_USE_EXTC)
 363         m8260_cpm_extcbrg(brg_map[KGDB_SMC_INDEX], speed,
 364                 CONFIG_KGDB_EXTC_RATE, CONFIG_KGDB_EXTC_PINSEL);
 365 #else
 366         m8260_cpm_setbrg(brg_map[KGDB_SMC_INDEX], speed);
 367 #endif
 368
 369         /* Make the first buffer the only buffer.
 370         */
 371         tbdf->cbd_sc |= BD_SC_WRAP;
 372         rbdf->cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP;
 373
 374         /* Single character receive.
 375         */
 376         up->smc_mrblr = 1;
 377         up->smc_maxidl = 0;
 378
 379         /* Initialize Tx/Rx parameters.
 380         */
 381
 382         while (cp->cp_cpcr & CPM_CR_FLG)  /* wait if cp is busy */
 383           ;
 384
 385         cp->cp_cpcr = mk_cr_cmd(KGDB_CPM_CR_SMC_PAGE, KGDB_CPM_CR_SMC_SBLOCK,
 386                                         0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
 387
 388         while (cp->cp_cpcr & CPM_CR_FLG)  /* wait if cp is busy */
 389           ;
 390
 391         /* Enable transmitter/receiver.
 392         */
 393         sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
 394
 395         printf("SMC%d at %dbps ", CONFIG_KGDB_INDEX, speed);
 396 }
 397
 398 void
 399 putDebugChar(const char c)
 400 {
 401         volatile cbd_t          *tbdf;
 402         volatile char           *buf;
 403         volatile smc_uart_t     *up;
 404         volatile immap_t        *im = (immap_t *)CFG_IMMR;
 405
 406         if (c == '\n')
 407                 putDebugChar ('\r');
 408
 409         up = (smc_uart_t *)&(im->im_dprambase[KGDB_PROFF_SMC]);
 410
 411         tbdf = (cbd_t *)&im->im_dprambase[up->smc_tbase];
 412
 413         /* Wait for last character to go.
 414         */
 415         buf = (char *)tbdf->cbd_bufaddr;
 416         while (tbdf->cbd_sc & BD_SC_READY)
 417                 ;
 418
 419         *buf = c;
 420         tbdf->cbd_datlen = 1;
 421         tbdf->cbd_sc |= BD_SC_READY;
 422 }
 423
 424 void
 425 putDebugStr (const char *s)
 426 {
 427         while (*s) {
 428                 putDebugChar (*s++);
 429         }
 430 }
 431
 432 int
 433 getDebugChar(void)
 434 {
 435         volatile cbd_t          *rbdf;
 436         volatile unsigned char  *buf;
 437         volatile smc_uart_t     *up;
 438         volatile immap_t        *im = (immap_t *)CFG_IMMR;
 439         unsigned char           c;
 440
 441         up = (smc_uart_t *)&(im->im_dprambase[KGDB_PROFF_SMC]);
 442
 443         rbdf = (cbd_t *)&im->im_dprambase[up->smc_rbase];
 444
 445         /* Wait for character to show up.
 446         */
 447         buf = (unsigned char *)rbdf->cbd_bufaddr;
 448         while (rbdf->cbd_sc & BD_SC_EMPTY)
 449                 ;
 450         c = *buf;
 451         rbdf->cbd_sc |= BD_SC_EMPTY;
 452
 453         return(c);
 454 }
 455
 456 void
 457 kgdb_interruptible(int yes)
 458 {
 459         return;
 460 }
 461
 462 #endif  /* CONFIG_KGDB_ON_SMC */