cpu/i386/sc520.c

   1 /*
   2  * (C) Copyright 2002
   3  * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
   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 /* stuff specific for the sc520,
  25  * but idependent of implementation */
  26
  27 #include <config.h>
  28
  29 #ifdef CONFIG_SC520
  30
  31 #include <common.h>
  32 #include <config.h>
  33 #include <pci.h>
  34 #ifdef CONFIG_SC520_SSI
  35 #include <ssi.h>
  36 #endif
  37 #include <asm/io.h>
  38 #include <asm/pci.h>
  39 #include <asm/ic/sc520.h>
  40
  41 DECLARE_GLOBAL_DATA_PTR;
  42
  43 /*
  44  * utility functions for boards based on the AMD sc520
  45  *
  46  * void write_mmcr_byte(u16 mmcr, u8 data)
  47  * void write_mmcr_word(u16 mmcr, u16 data)
  48  * void write_mmcr_long(u16 mmcr, u32 data)
  49  *
  50  * u8   read_mmcr_byte(u16 mmcr)
  51  * u16  read_mmcr_word(u16 mmcr)
  52  * u32  read_mmcr_long(u16 mmcr)
  53  *
  54  * void init_sc520(void)
  55  * unsigned long init_sc520_dram(void)
  56  * void pci_sc520_init(struct pci_controller *hose)
  57  *
  58  * void reset_timer(void)
  59  * ulong get_timer(ulong base)
  60  * void set_timer(ulong t)
  61  * void udelay(unsigned long usec)
  62  *
  63  */
  64
  65 static u32 mmcr_base= 0xfffef000;
  66
  67 void write_mmcr_byte(u16 mmcr, u8 data)
  68 {
  69         writeb(data, mmcr+mmcr_base);
  70 }
  71
  72 void write_mmcr_word(u16 mmcr, u16 data)
  73 {
  74         writew(data, mmcr+mmcr_base);
  75 }
  76
  77 void write_mmcr_long(u16 mmcr, u32 data)
  78 {
  79         writel(data, mmcr+mmcr_base);
  80 }
  81
  82 u8 read_mmcr_byte(u16 mmcr)
  83 {
  84         return readb(mmcr+mmcr_base);
  85 }
  86
  87 u16 read_mmcr_word(u16 mmcr)
  88 {
  89         return readw(mmcr+mmcr_base);
  90 }
  91
  92 u32 read_mmcr_long(u16 mmcr)
  93 {
  94         return readl(mmcr+mmcr_base);
  95 }
  96
  97
  98 void init_sc520(void)
  99 {
 100         /* Set the UARTxCTL register at it's slower,
 101          * baud clock giving us a 1.8432 MHz reference
 102          */
 103         write_mmcr_byte(SC520_UART1CTL, 7);
 104         write_mmcr_byte(SC520_UART2CTL, 7);
 105
 106         /* first set the timer pin mapping */
 107         write_mmcr_byte(SC520_CLKSEL, 0x72);    /* no clock frequency selected, use 1.1892MHz */
 108
 109         /* enable PCI bus arbitrer */
 110         write_mmcr_byte(SC520_SYSARBCTL,0x02);  /* enable concurrent mode */
 111
 112         write_mmcr_word(SC520_SYSARBMENB,0x1f); /* enable external grants */
 113         write_mmcr_word(SC520_HBCTL,0x04);      /* enable posted-writes */
 114
 115
 116         if (CONFIG_SYS_SC520_HIGH_SPEED) {
 117                 write_mmcr_byte(SC520_CPUCTL, 0x2);     /* set it to 133 MHz and write back */
 118                 gd->cpu_clk = 133000000;
 119                 printf("## CPU Speed set to 133MHz\n");
 120         } else {
 121                 write_mmcr_byte(SC520_CPUCTL, 1);       /* set CPU to 100 MHz and write back cache */
 122                 printf("## CPU Speed set to 100MHz\n");
 123                 gd->cpu_clk = 100000000;
 124         }
 125
 126
 127         /* wait at least one millisecond */
 128         asm("movl       $0x2000,%%ecx\n"
 129             "wait_loop: pushl %%ecx\n"
 130             "popl       %%ecx\n"
 131             "loop wait_loop\n": : : "ecx");
 132
 133         /* turn on the SDRAM write buffer */
 134         write_mmcr_byte(SC520_DBCTL, 0x11);
 135
 136         /* turn on the cache and disable write through */
 137         asm("movl       %%cr0, %%eax\n"
 138             "andl       $0x9fffffff, %%eax\n"
 139             "movl       %%eax, %%cr0\n"  : : : "eax");
 140 }
 141
 142 unsigned long init_sc520_dram(void)
 143 {
 144         bd_t *bd = gd->bd;
 145
 146         u32 dram_present=0;
 147         u32 dram_ctrl;
 148 #ifdef CONFIG_SYS_SDRAM_DRCTMCTL
 149         /* these memory control registers are set up in the assember part,
 150          * in sc520_asm.S, during 'mem_init'.  If we muck with them here,
 151          * after we are running a stack in RAM, we have troubles.  Besides,
 152          * these refresh and delay values are better ? simply specified
 153          * outright in the include/configs/{cfg} file since the HW designer
 154          * simply dictates it.
 155          */
 156 #else
 157         int val;
 158
 159         int cas_precharge_delay = CONFIG_SYS_SDRAM_PRECHARGE_DELAY;
 160         int refresh_rate        = CONFIG_SYS_SDRAM_REFRESH_RATE;
 161         int ras_cas_delay       = CONFIG_SYS_SDRAM_RAS_CAS_DELAY;
 162
 163         /* set SDRAM speed here */
 164
 165         refresh_rate/=78;
 166         if (refresh_rate<=1) {
 167                 val = 0;  /* 7.8us */
 168         } else if (refresh_rate==2) {
 169                 val = 1;  /* 15.6us */
 170         } else if (refresh_rate==3 || refresh_rate==4) {
 171                 val = 2;  /* 31.2us */
 172         } else {
 173                 val = 3;  /* 62.4us */
 174         }
 175
 176         write_mmcr_byte(SC520_DRCCTL, (read_mmcr_byte(SC520_DRCCTL) & 0xcf) | (val<<4));
 177
 178         val = read_mmcr_byte(SC520_DRCTMCTL);
 179         val &= 0xf0;
 180
 181         if (cas_precharge_delay==3) {
 182                 val |= 0x04;   /* 3T */
 183         } else if (cas_precharge_delay==4) {
 184                 val |= 0x08;   /* 4T */
 185         } else if (cas_precharge_delay>4) {
 186                 val |= 0x0c;
 187         }
 188
 189         if (ras_cas_delay > 3) {
 190                 val |= 2;
 191         } else {
 192                 val |= 1;
 193         }
 194         write_mmcr_byte(SC520_DRCTMCTL, val);
 195 #endif
 196
 197         /* We read-back the configuration of the dram
 198          * controller that the assembly code wrote */
 199         dram_ctrl = read_mmcr_long(SC520_DRCBENDADR);
 200
 201         bd->bi_dram[0].start = 0;
 202         if (dram_ctrl & 0x80) {
 203                 /* bank 0 enabled */
 204                 dram_present = bd->bi_dram[1].start = (dram_ctrl & 0x7f) << 22;
 205                 bd->bi_dram[0].size = bd->bi_dram[1].start;
 206
 207         } else {
 208                 bd->bi_dram[0].size = 0;
 209                 bd->bi_dram[1].start = bd->bi_dram[0].start;
 210         }
 211
 212         if (dram_ctrl & 0x8000) {
 213                 /* bank 1 enabled */
 214                 dram_present = bd->bi_dram[2].start = (dram_ctrl & 0x7f00) << 14;
 215                 bd->bi_dram[1].size = bd->bi_dram[2].start -  bd->bi_dram[1].start;
 216         } else {
 217                 bd->bi_dram[1].size = 0;
 218                 bd->bi_dram[2].start = bd->bi_dram[1].start;
 219         }
 220
 221         if (dram_ctrl & 0x800000) {
 222                 /* bank 2 enabled */
 223                 dram_present = bd->bi_dram[3].start = (dram_ctrl & 0x7f0000) << 6;
 224                 bd->bi_dram[2].size = bd->bi_dram[3].start -  bd->bi_dram[2].start;
 225         } else {
 226                 bd->bi_dram[2].size = 0;
 227                 bd->bi_dram[3].start = bd->bi_dram[2].start;
 228         }
 229
 230         if (dram_ctrl & 0x80000000) {
 231                 /* bank 3 enabled */
 232                 dram_present  = (dram_ctrl & 0x7f000000) >> 2;
 233                 bd->bi_dram[3].size = dram_present -  bd->bi_dram[3].start;
 234         } else {
 235                 bd->bi_dram[3].size = 0;
 236         }
 237
 238
 239 #if 0
 240         printf("Configured %d bytes of dram\n", dram_present);
 241 #endif
 242         gd->ram_size = dram_present;
 243
 244         return dram_present;
 245 }
 246
 247
 248 #ifdef CONFIG_PCI
 249
 250
 251 static struct {
 252         u8 priority;
 253         u16 level_reg;
 254         u8 level_bit;
 255 } sc520_irq[] = {
 256         { SC520_IRQ0,  SC520_MPICMODE,  0x01 },
 257         { SC520_IRQ1,  SC520_MPICMODE,  0x02 },
 258         { SC520_IRQ2,  SC520_SL1PICMODE, 0x02 },
 259         { SC520_IRQ3,  SC520_MPICMODE,  0x08 },
 260         { SC520_IRQ4,  SC520_MPICMODE,  0x10 },
 261         { SC520_IRQ5,  SC520_MPICMODE,  0x20 },
 262         { SC520_IRQ6,  SC520_MPICMODE,  0x40 },
 263         { SC520_IRQ7,  SC520_MPICMODE,  0x80 },
 264
 265         { SC520_IRQ8,  SC520_SL1PICMODE, 0x01 },
 266         { SC520_IRQ9,  SC520_SL1PICMODE, 0x02 },
 267         { SC520_IRQ10, SC520_SL1PICMODE, 0x04 },
 268         { SC520_IRQ11, SC520_SL1PICMODE, 0x08 },
 269         { SC520_IRQ12, SC520_SL1PICMODE, 0x10 },
 270         { SC520_IRQ13, SC520_SL1PICMODE, 0x20 },
 271         { SC520_IRQ14, SC520_SL1PICMODE, 0x40 },
 272         { SC520_IRQ15, SC520_SL1PICMODE, 0x80 }
 273 };
 274
 275
 276 /* The interrupt used for PCI INTA-INTD  */
 277 int sc520_pci_ints[15] = {
 278         -1, -1, -1, -1, -1, -1, -1, -1,
 279                 -1, -1, -1, -1, -1, -1, -1
 280 };
 281
 282 /* utility function to configure a pci interrupt */
 283 int pci_sc520_set_irq(int pci_pin, int irq)
 284 {
 285         int i;
 286
 287 # if 1
 288         printf("set_irq(): map INT%c to IRQ%d\n", pci_pin + 'A', irq);
 289 #endif
 290         if (irq < 0 || irq > 15) {
 291                 return -1; /* illegal irq */
 292         }
 293
 294         if (pci_pin < 0 || pci_pin > 15) {
 295                 return -1; /* illegal pci int pin */
 296         }
 297
 298         /* first disable any non-pci interrupt source that use
 299          * this level */
 300         for (i=SC520_GPTMR0MAP;i<=SC520_GP10IMAP;i++) {
 301                 if (i>=SC520_PCIINTAMAP&&i<=SC520_PCIINTDMAP) {
 302                         continue;
 303                 }
 304                 if (read_mmcr_byte(i) == sc520_irq[irq].priority) {
 305                         write_mmcr_byte(i, SC520_IRQ_DISABLED);
 306                 }
 307         }
 308
 309         /* Set the trigger to level */
 310         write_mmcr_byte(sc520_irq[irq].level_reg,
 311                         read_mmcr_byte(sc520_irq[irq].level_reg) | sc520_irq[irq].level_bit);
 312
 313
 314         if (pci_pin < 4) {
 315                 /* PCI INTA-INTD */
 316                 /* route the interrupt */
 317                 write_mmcr_byte(SC520_PCIINTAMAP + pci_pin, sc520_irq[irq].priority);
 318
 319
 320         } else {
 321                 /* GPIRQ0-GPIRQ10 used for additional PCI INTS */
 322                 write_mmcr_byte(SC520_GP0IMAP + pci_pin - 4, sc520_irq[irq].priority);
 323
 324                 /* also set the polarity in this case */
 325                 write_mmcr_word(SC520_INTPINPOL,
 326                                 read_mmcr_word(SC520_INTPINPOL) | (1 << (pci_pin-4)));
 327
 328         }
 329
 330         /* register the pin */
 331         sc520_pci_ints[pci_pin] = irq;
 332
 333
 334         return 0; /* OK */
 335 }
 336
 337 void pci_sc520_init(struct pci_controller *hose)
 338 {
 339         hose->first_busno = 0;
 340         hose->last_busno = 0xff;
 341
 342         /* System memory space */
 343         pci_set_region(hose->regions + 0,
 344                        SC520_PCI_MEMORY_BUS,
 345                        SC520_PCI_MEMORY_PHYS,
 346                        SC520_PCI_MEMORY_SIZE,
 347                        PCI_REGION_MEM | PCI_REGION_MEMORY);
 348
 349         /* PCI memory space */
 350         pci_set_region(hose->regions + 1,
 351                        SC520_PCI_MEM_BUS,
 352                        SC520_PCI_MEM_PHYS,
 353                        SC520_PCI_MEM_SIZE,
 354                        PCI_REGION_MEM);
 355
 356         /* ISA/PCI memory space */
 357         pci_set_region(hose->regions + 2,
 358                        SC520_ISA_MEM_BUS,
 359                        SC520_ISA_MEM_PHYS,
 360                        SC520_ISA_MEM_SIZE,
 361                        PCI_REGION_MEM);
 362
 363         /* PCI I/O space */
 364         pci_set_region(hose->regions + 3,
 365                        SC520_PCI_IO_BUS,
 366                        SC520_PCI_IO_PHYS,
 367                        SC520_PCI_IO_SIZE,
 368                        PCI_REGION_IO);
 369
 370         /* ISA/PCI I/O space */
 371         pci_set_region(hose->regions + 4,
 372                        SC520_ISA_IO_BUS,
 373                        SC520_ISA_IO_PHYS,
 374                        SC520_ISA_IO_SIZE,
 375                        PCI_REGION_IO);
 376
 377         hose->region_count = 5;
 378
 379         pci_setup_type1(hose,
 380                         SC520_REG_ADDR,
 381                         SC520_REG_DATA);
 382
 383         pci_register_hose(hose);
 384
 385         hose->last_busno = pci_hose_scan(hose);
 386
 387         /* enable target memory acceses on host brige */
 388         pci_write_config_word(0, PCI_COMMAND,
 389                               PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
 390
 391 }
 392
 393
 394 #endif
 395
 396 #ifdef CONFIG_SYS_TIMER_SC520
 397
 398
 399 void reset_timer(void)
 400 {
 401         write_mmcr_word(SC520_GPTMR0CNT, 0);
 402         write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
 403
 404 }
 405
 406 ulong get_timer(ulong base)
 407 {
 408         /* fixme: 30 or 33 */
 409         return  read_mmcr_word(SC520_GPTMR0CNT) / 33;
 410 }
 411
 412 void set_timer(ulong t)
 413 {
 414         /* FixMe: use two cascade coupled timers */
 415         write_mmcr_word(SC520_GPTMR0CTL, 0x4001);
 416         write_mmcr_word(SC520_GPTMR0CNT, t*33);
 417         write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
 418 }
 419
 420
 421 void udelay(unsigned long usec)
 422 {
 423         int m=0;
 424         long u;
 425
 426         read_mmcr_word(SC520_SWTMRMILLI);
 427         read_mmcr_word(SC520_SWTMRMICRO);
 428
 429 #if 0
 430         /* do not enable this line, udelay is used in the serial driver -> recursion */
 431         printf("udelay: %ld m.u %d.%d  tm.tu %d.%d\n", usec, m, u, tm, tu);
 432 #endif
 433         while (1) {
 434
 435                 m += read_mmcr_word(SC520_SWTMRMILLI);
 436                 u = read_mmcr_word(SC520_SWTMRMICRO) + (m * 1000);
 437
 438                 if (usec <= u) {
 439                         break;
 440                 }
 441         }
 442 }
 443
 444 #endif
 445
 446 int ssi_set_interface(int freq, int lsb_first, int inv_clock, int inv_phase)
 447 {
 448         u8 temp=0;
 449
 450         if (freq >= 8192) {
 451                 temp |= CTL_CLK_SEL_4;
 452         } else if (freq >= 4096) {
 453                 temp |= CTL_CLK_SEL_8;
 454         } else if (freq >= 2048) {
 455                 temp |= CTL_CLK_SEL_16;
 456         } else if (freq >= 1024) {
 457                 temp |= CTL_CLK_SEL_32;
 458         } else if (freq >= 512) {
 459                 temp |= CTL_CLK_SEL_64;
 460         } else if (freq >= 256) {
 461                 temp |= CTL_CLK_SEL_128;
 462         } else if (freq >= 128) {
 463                 temp |= CTL_CLK_SEL_256;
 464         } else {
 465                 temp |= CTL_CLK_SEL_512;
 466         }
 467
 468         if (!lsb_first) {
 469                 temp |= MSBF_ENB;
 470         }
 471
 472         if (inv_clock) {
 473                 temp |= CLK_INV_ENB;
 474         }
 475
 476         if (inv_phase) {
 477                 temp |= PHS_INV_ENB;
 478         }
 479
 480         write_mmcr_byte(SC520_SSICTL, temp);
 481
 482         return 0;
 483 }
 484
 485 u8 ssi_txrx_byte(u8 data)
 486 {
 487         write_mmcr_byte(SC520_SSIXMIT, data);
 488         while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
 489         write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMITRCV);
 490         while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
 491         return read_mmcr_byte(SC520_SSIRCV);
 492 }
 493
 494
 495 void ssi_tx_byte(u8 data)
 496 {
 497         write_mmcr_byte(SC520_SSIXMIT, data);
 498         while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
 499         write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMIT);
 500 }
 501
 502 u8 ssi_rx_byte(void)
 503 {
 504         while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
 505         write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_RCV);
 506         while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
 507         return read_mmcr_byte(SC520_SSIRCV);
 508 }
 509
 510 #endif /* CONFIG_SC520 */