hw/stellaris.c

   1 /*
   2  * Luminary Micro Stellaris preipherals
   3  *
   4  * Copyright (c) 2006 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licenced under the GPL.
   8  */
   9
  10 #include "hw.h"
  11 #include "arm-misc.h"
  12 #include "primecell.h"
  13 #include "devices.h"
  14 #include "qemu-timer.h"
  15 #include "i2c.h"
  16 #include "net.h"
  17 #include "sd.h"
  18 #include "sysemu.h"
  19 #include "boards.h"
  20
  21 #define GPIO_A 0
  22 #define GPIO_B 1
  23 #define GPIO_C 2
  24 #define GPIO_D 3
  25 #define GPIO_E 4
  26 #define GPIO_F 5
  27 #define GPIO_G 6
  28
  29 #define BP_OLED_I2C  0x01
  30 #define BP_OLED_SSI  0x02
  31 #define BP_GAMEPAD   0x04
  32
  33 typedef const struct {
  34     const char *name;
  35     uint32_t did0;
  36     uint32_t did1;
  37     uint32_t dc0;
  38     uint32_t dc1;
  39     uint32_t dc2;
  40     uint32_t dc3;
  41     uint32_t dc4;
  42     uint32_t peripherals;
  43 } stellaris_board_info;
  44
  45 /* General purpose timer module.  */
  46
  47 typedef struct gptm_state {
  48     uint32_t config;
  49     uint32_t mode[2];
  50     uint32_t control;
  51     uint32_t state;
  52     uint32_t mask;
  53     uint32_t load[2];
  54     uint32_t match[2];
  55     uint32_t prescale[2];
  56     uint32_t match_prescale[2];
  57     uint32_t rtc;
  58     int64_t tick[2];
  59     struct gptm_state *opaque[2];
  60     uint32_t base;
  61     QEMUTimer *timer[2];
  62     /* The timers have an alternate output used to trigger the ADC.  */
  63     qemu_irq trigger;
  64     qemu_irq irq;
  65 } gptm_state;
  66
  67 static void gptm_update_irq(gptm_state *s)
  68 {
  69     int level;
  70     level = (s->state & s->mask) != 0;
  71     qemu_set_irq(s->irq, level);
  72 }
  73
  74 static void gptm_stop(gptm_state *s, int n)
  75 {
  76     qemu_del_timer(s->timer[n]);
  77 }
  78
  79 static void gptm_reload(gptm_state *s, int n, int reset)
  80 {
  81     int64_t tick;
  82     if (reset)
  83         tick = qemu_get_clock(vm_clock);
  84     else
  85         tick = s->tick[n];
  86
  87     if (s->config == 0) {
  88         /* 32-bit CountDown.  */
  89         uint32_t count;
  90         count = s->load[0] | (s->load[1] << 16);
  91         tick += (int64_t)count * system_clock_scale;
  92     } else if (s->config == 1) {
  93         /* 32-bit RTC.  1Hz tick.  */
  94         tick += ticks_per_sec;
  95     } else if (s->mode[n] == 0xa) {
  96         /* PWM mode.  Not implemented.  */
  97     } else {
  98         cpu_abort(cpu_single_env, "TODO: 16-bit timer mode 0x%x\n",
  99                   s->mode[n]);
 100     }
 101     s->tick[n] = tick;
 102     qemu_mod_timer(s->timer[n], tick);
 103 }
 104
 105 static void gptm_tick(void *opaque)
 106 {
 107     gptm_state **p = (gptm_state **)opaque;
 108     gptm_state *s;
 109     int n;
 110
 111     s = *p;
 112     n = p - s->opaque;
 113     if (s->config == 0) {
 114         s->state |= 1;
 115         if ((s->control & 0x20)) {
 116             /* Output trigger.  */
 117             qemu_irq_raise(s->trigger);
 118             qemu_irq_lower(s->trigger);
 119         }
 120         if (s->mode[0] & 1) {
 121             /* One-shot.  */
 122             s->control &= ~1;
 123         } else {
 124             /* Periodic.  */
 125             gptm_reload(s, 0, 0);
 126         }
 127     } else if (s->config == 1) {
 128         /* RTC.  */
 129         uint32_t match;
 130         s->rtc++;
 131         match = s->match[0] | (s->match[1] << 16);
 132         if (s->rtc > match)
 133             s->rtc = 0;
 134         if (s->rtc == 0) {
 135             s->state |= 8;
 136         }
 137         gptm_reload(s, 0, 0);
 138     } else if (s->mode[n] == 0xa) {
 139         /* PWM mode.  Not implemented.  */
 140     } else {
 141         cpu_abort(cpu_single_env, "TODO: 16-bit timer mode 0x%x\n",
 142                   s->mode[n]);
 143     }
 144     gptm_update_irq(s);
 145 }
 146
 147 static uint32_t gptm_read(void *opaque, target_phys_addr_t offset)
 148 {
 149     gptm_state *s = (gptm_state *)opaque;
 150
 151     offset -= s->base;
 152     switch (offset) {
 153     case 0x00: /* CFG */
 154         return s->config;
 155     case 0x04: /* TAMR */
 156         return s->mode[0];
 157     case 0x08: /* TBMR */
 158         return s->mode[1];
 159     case 0x0c: /* CTL */
 160         return s->control;
 161     case 0x18: /* IMR */
 162         return s->mask;
 163     case 0x1c: /* RIS */
 164         return s->state;
 165     case 0x20: /* MIS */
 166         return s->state & s->mask;
 167     case 0x24: /* CR */
 168         return 0;
 169     case 0x28: /* TAILR */
 170         return s->load[0] | ((s->config < 4) ? (s->load[1] << 16) : 0);
 171     case 0x2c: /* TBILR */
 172         return s->load[1];
 173     case 0x30: /* TAMARCHR */
 174         return s->match[0] | ((s->config < 4) ? (s->match[1] << 16) : 0);
 175     case 0x34: /* TBMATCHR */
 176         return s->match[1];
 177     case 0x38: /* TAPR */
 178         return s->prescale[0];
 179     case 0x3c: /* TBPR */
 180         return s->prescale[1];
 181     case 0x40: /* TAPMR */
 182         return s->match_prescale[0];
 183     case 0x44: /* TBPMR */
 184         return s->match_prescale[1];
 185     case 0x48: /* TAR */
 186         if (s->control == 1)
 187             return s->rtc;
 188     case 0x4c: /* TBR */
 189         cpu_abort(cpu_single_env, "TODO: Timer value read\n");
 190     default:
 191         cpu_abort(cpu_single_env, "gptm_read: Bad offset 0x%x\n", (int)offset);
 192         return 0;
 193     }
 194 }
 195
 196 static void gptm_write(void *opaque, target_phys_addr_t offset, uint32_t value)
 197 {
 198     gptm_state *s = (gptm_state *)opaque;
 199     uint32_t oldval;
 200
 201     offset -= s->base;
 202     /* The timers should be disabled before changing the configuration.
 203        We take advantage of this and defer everything until the timer
 204        is enabled.  */
 205     switch (offset) {
 206     case 0x00: /* CFG */
 207         s->config = value;
 208         break;
 209     case 0x04: /* TAMR */
 210         s->mode[0] = value;
 211         break;
 212     case 0x08: /* TBMR */
 213         s->mode[1] = value;
 214         break;
 215     case 0x0c: /* CTL */
 216         oldval = s->control;
 217         s->control = value;
 218         /* TODO: Implement pause.  */
 219         if ((oldval ^ value) & 1) {
 220             if (value & 1) {
 221                 gptm_reload(s, 0, 1);
 222             } else {
 223                 gptm_stop(s, 0);
 224             }
 225         }
 226         if (((oldval ^ value) & 0x100) && s->config >= 4) {
 227             if (value & 0x100) {
 228                 gptm_reload(s, 1, 1);
 229             } else {
 230                 gptm_stop(s, 1);
 231             }
 232         }
 233         break;
 234     case 0x18: /* IMR */
 235         s->mask = value & 0x77;
 236         gptm_update_irq(s);
 237         break;
 238     case 0x24: /* CR */
 239         s->state &= ~value;
 240         break;
 241     case 0x28: /* TAILR */
 242         s->load[0] = value & 0xffff;
 243         if (s->config < 4) {
 244             s->load[1] = value >> 16;
 245         }
 246         break;
 247     case 0x2c: /* TBILR */
 248         s->load[1] = value & 0xffff;
 249         break;
 250     case 0x30: /* TAMARCHR */
 251         s->match[0] = value & 0xffff;
 252         if (s->config < 4) {
 253             s->match[1] = value >> 16;
 254         }
 255         break;
 256     case 0x34: /* TBMATCHR */
 257         s->match[1] = value >> 16;
 258         break;
 259     case 0x38: /* TAPR */
 260         s->prescale[0] = value;
 261         break;
 262     case 0x3c: /* TBPR */
 263         s->prescale[1] = value;
 264         break;
 265     case 0x40: /* TAPMR */
 266         s->match_prescale[0] = value;
 267         break;
 268     case 0x44: /* TBPMR */
 269         s->match_prescale[0] = value;
 270         break;
 271     default:
 272         cpu_abort(cpu_single_env, "gptm_write: Bad offset 0x%x\n", (int)offset);
 273     }
 274     gptm_update_irq(s);
 275 }
 276
 277 static CPUReadMemoryFunc *gptm_readfn[] = {
 278    gptm_read,
 279    gptm_read,
 280    gptm_read
 281 };
 282
 283 static CPUWriteMemoryFunc *gptm_writefn[] = {
 284    gptm_write,
 285    gptm_write,
 286    gptm_write
 287 };
 288
 289 static void stellaris_gptm_init(uint32_t base, qemu_irq irq, qemu_irq trigger)
 290 {
 291     int iomemtype;
 292     gptm_state *s;
 293
 294     s = (gptm_state *)qemu_mallocz(sizeof(gptm_state));
 295     s->base = base;
 296     s->irq = irq;
 297     s->trigger = trigger;
 298     s->opaque[0] = s->opaque[1] = s;
 299
 300     iomemtype = cpu_register_io_memory(0, gptm_readfn,
 301                                        gptm_writefn, s);
 302     cpu_register_physical_memory(base, 0x00001000, iomemtype);
 303     s->timer[0] = qemu_new_timer(vm_clock, gptm_tick, &s->opaque[0]);
 304     s->timer[1] = qemu_new_timer(vm_clock, gptm_tick, &s->opaque[1]);
 305     /* ??? Save/restore.  */
 306 }
 307
 308
 309 /* System controller.  */
 310
 311 typedef struct {
 312     uint32_t base;
 313     uint32_t pborctl;
 314     uint32_t ldopctl;
 315     uint32_t int_status;
 316     uint32_t int_mask;
 317     uint32_t resc;
 318     uint32_t rcc;
 319     uint32_t rcgc[3];
 320     uint32_t scgc[3];
 321     uint32_t dcgc[3];
 322     uint32_t clkvclr;
 323     uint32_t ldoarst;
 324     uint32_t user0;
 325     uint32_t user1;
 326     qemu_irq irq;
 327     stellaris_board_info *board;
 328 } ssys_state;
 329
 330 static void ssys_update(ssys_state *s)
 331 {
 332   qemu_set_irq(s->irq, (s->int_status & s->int_mask) != 0);
 333 }
 334
 335 static uint32_t pllcfg_sandstorm[16] = {
 336     0x31c0, /* 1 Mhz */
 337     0x1ae0, /* 1.8432 Mhz */
 338     0x18c0, /* 2 Mhz */
 339     0xd573, /* 2.4576 Mhz */
 340     0x37a6, /* 3.57954 Mhz */
 341     0x1ae2, /* 3.6864 Mhz */
 342     0x0c40, /* 4 Mhz */
 343     0x98bc, /* 4.906 Mhz */
 344     0x935b, /* 4.9152 Mhz */
 345     0x09c0, /* 5 Mhz */
 346     0x4dee, /* 5.12 Mhz */
 347     0x0c41, /* 6 Mhz */
 348     0x75db, /* 6.144 Mhz */
 349     0x1ae6, /* 7.3728 Mhz */
 350     0x0600, /* 8 Mhz */
 351     0x585b /* 8.192 Mhz */
 352 };
 353
 354 static uint32_t pllcfg_fury[16] = {
 355     0x3200, /* 1 Mhz */
 356     0x1b20, /* 1.8432 Mhz */
 357     0x1900, /* 2 Mhz */
 358     0xf42b, /* 2.4576 Mhz */
 359     0x37e3, /* 3.57954 Mhz */
 360     0x1b21, /* 3.6864 Mhz */
 361     0x0c80, /* 4 Mhz */
 362     0x98ee, /* 4.906 Mhz */
 363     0xd5b4, /* 4.9152 Mhz */
 364     0x0a00, /* 5 Mhz */
 365     0x4e27, /* 5.12 Mhz */
 366     0x1902, /* 6 Mhz */
 367     0xec1c, /* 6.144 Mhz */
 368     0x1b23, /* 7.3728 Mhz */
 369     0x0640, /* 8 Mhz */
 370     0xb11c /* 8.192 Mhz */
 371 };
 372
 373 static uint32_t ssys_read(void *opaque, target_phys_addr_t offset)
 374 {
 375     ssys_state *s = (ssys_state *)opaque;
 376
 377     offset -= s->base;
 378     switch (offset) {
 379     case 0x000: /* DID0 */
 380         return s->board->did0;
 381     case 0x004: /* DID1 */
 382         return s->board->did1;
 383     case 0x008: /* DC0 */
 384         return s->board->dc0;
 385     case 0x010: /* DC1 */
 386         return s->board->dc1;
 387     case 0x014: /* DC2 */
 388         return s->board->dc2;
 389     case 0x018: /* DC3 */
 390         return s->board->dc3;
 391     case 0x01c: /* DC4 */
 392         return s->board->dc4;
 393     case 0x030: /* PBORCTL */
 394         return s->pborctl;
 395     case 0x034: /* LDOPCTL */
 396         return s->ldopctl;
 397     case 0x040: /* SRCR0 */
 398         return 0;
 399     case 0x044: /* SRCR1 */
 400         return 0;
 401     case 0x048: /* SRCR2 */
 402         return 0;
 403     case 0x050: /* RIS */
 404         return s->int_status;
 405     case 0x054: /* IMC */
 406         return s->int_mask;
 407     case 0x058: /* MISC */
 408         return s->int_status & s->int_mask;
 409     case 0x05c: /* RESC */
 410         return s->resc;
 411     case 0x060: /* RCC */
 412         return s->rcc;
 413     case 0x064: /* PLLCFG */
 414         {
 415             int xtal;
 416             xtal = (s->rcc >> 6) & 0xf;
 417             if (s->board->did0 & (1 << 16)) {
 418                 return pllcfg_fury[xtal];
 419             } else {
 420                 return pllcfg_sandstorm[xtal];
 421             }
 422         }
 423     case 0x100: /* RCGC0 */
 424         return s->rcgc[0];
 425     case 0x104: /* RCGC1 */
 426         return s->rcgc[1];
 427     case 0x108: /* RCGC2 */
 428         return s->rcgc[2];
 429     case 0x110: /* SCGC0 */
 430         return s->scgc[0];
 431     case 0x114: /* SCGC1 */
 432         return s->scgc[1];
 433     case 0x118: /* SCGC2 */
 434         return s->scgc[2];
 435     case 0x120: /* DCGC0 */
 436         return s->dcgc[0];
 437     case 0x124: /* DCGC1 */
 438         return s->dcgc[1];
 439     case 0x128: /* DCGC2 */
 440         return s->dcgc[2];
 441     case 0x150: /* CLKVCLR */
 442         return s->clkvclr;
 443     case 0x160: /* LDOARST */
 444         return s->ldoarst;
 445     case 0x1e0: /* USER0 */
 446         return s->user0;
 447     case 0x1e4: /* USER1 */
 448         return s->user1;
 449     default:
 450         cpu_abort(cpu_single_env, "ssys_read: Bad offset 0x%x\n", (int)offset);
 451         return 0;
 452     }
 453 }
 454
 455 static void ssys_write(void *opaque, target_phys_addr_t offset, uint32_t value)
 456 {
 457     ssys_state *s = (ssys_state *)opaque;
 458
 459     offset -= s->base;
 460     switch (offset) {
 461     case 0x030: /* PBORCTL */
 462         s->pborctl = value & 0xffff;
 463         break;
 464     case 0x034: /* LDOPCTL */
 465         s->ldopctl = value & 0x1f;
 466         break;
 467     case 0x040: /* SRCR0 */
 468     case 0x044: /* SRCR1 */
 469     case 0x048: /* SRCR2 */
 470         fprintf(stderr, "Peripheral reset not implemented\n");
 471         break;
 472     case 0x054: /* IMC */
 473         s->int_mask = value & 0x7f;
 474         break;
 475     case 0x058: /* MISC */
 476         s->int_status &= ~value;
 477         break;
 478     case 0x05c: /* RESC */
 479         s->resc = value & 0x3f;
 480         break;
 481     case 0x060: /* RCC */
 482         if ((s->rcc & (1 << 13)) != 0 && (value & (1 << 13)) == 0) {
 483             /* PLL enable.  */
 484             s->int_status |= (1 << 6);
 485         }
 486         s->rcc = value;
 487         system_clock_scale = 5 * (((s->rcc >> 23) & 0xf) + 1);
 488         break;
 489     case 0x100: /* RCGC0 */
 490         s->rcgc[0] = value;
 491         break;
 492     case 0x104: /* RCGC1 */
 493         s->rcgc[1] = value;
 494         break;
 495     case 0x108: /* RCGC2 */
 496         s->rcgc[2] = value;
 497         break;
 498     case 0x110: /* SCGC0 */
 499         s->scgc[0] = value;
 500         break;
 501     case 0x114: /* SCGC1 */
 502         s->scgc[1] = value;
 503         break;
 504     case 0x118: /* SCGC2 */
 505         s->scgc[2] = value;
 506         break;
 507     case 0x120: /* DCGC0 */
 508         s->dcgc[0] = value;
 509         break;
 510     case 0x124: /* DCGC1 */
 511         s->dcgc[1] = value;
 512         break;
 513     case 0x128: /* DCGC2 */
 514         s->dcgc[2] = value;
 515         break;
 516     case 0x150: /* CLKVCLR */
 517         s->clkvclr = value;
 518         break;
 519     case 0x160: /* LDOARST */
 520         s->ldoarst = value;
 521         break;
 522     default:
 523         cpu_abort(cpu_single_env, "ssys_write: Bad offset 0x%x\n", (int)offset);
 524     }
 525     ssys_update(s);
 526 }
 527
 528 static CPUReadMemoryFunc *ssys_readfn[] = {
 529    ssys_read,
 530    ssys_read,
 531    ssys_read
 532 };
 533
 534 static CPUWriteMemoryFunc *ssys_writefn[] = {
 535    ssys_write,
 536    ssys_write,
 537    ssys_write
 538 };
 539
 540 static void ssys_reset(void *opaque)
 541 {
 542     ssys_state *s = (ssys_state *)opaque;
 543
 544     s->pborctl = 0x7ffd;
 545     s->rcc = 0x078e3ac0;
 546     s->rcgc[0] = 1;
 547     s->scgc[0] = 1;
 548     s->dcgc[0] = 1;
 549 }
 550
 551 static void stellaris_sys_init(uint32_t base, qemu_irq irq,
 552                                stellaris_board_info * board,
 553                                uint8_t *macaddr)
 554 {
 555     int iomemtype;
 556     ssys_state *s;
 557
 558     s = (ssys_state *)qemu_mallocz(sizeof(ssys_state));
 559     s->base = base;
 560     s->irq = irq;
 561     s->board = board;
 562     /* Most devices come preprogrammed with a MAC address in the user data. */
 563     s->user0 = macaddr[0] | (macaddr[1] << 8) | (macaddr[2] << 16);
 564     s->user1 = macaddr[3] | (macaddr[4] << 8) | (macaddr[5] << 16);
 565
 566     iomemtype = cpu_register_io_memory(0, ssys_readfn,
 567                                        ssys_writefn, s);
 568     cpu_register_physical_memory(base, 0x00001000, iomemtype);
 569     ssys_reset(s);
 570     /* ??? Save/restore.  */
 571 }
 572
 573
 574 /* I2C controller.  */
 575
 576 typedef struct {
 577     i2c_bus *bus;
 578     qemu_irq irq;
 579     uint32_t base;
 580     uint32_t msa;
 581     uint32_t mcs;
 582     uint32_t mdr;
 583     uint32_t mtpr;
 584     uint32_t mimr;
 585     uint32_t mris;
 586     uint32_t mcr;
 587 } stellaris_i2c_state;
 588
 589 #define STELLARIS_I2C_MCS_BUSY    0x01
 590 #define STELLARIS_I2C_MCS_ERROR   0x02
 591 #define STELLARIS_I2C_MCS_ADRACK  0x04
 592 #define STELLARIS_I2C_MCS_DATACK  0x08
 593 #define STELLARIS_I2C_MCS_ARBLST  0x10
 594 #define STELLARIS_I2C_MCS_IDLE    0x20
 595 #define STELLARIS_I2C_MCS_BUSBSY  0x40
 596
 597 static uint32_t stellaris_i2c_read(void *opaque, target_phys_addr_t offset)
 598 {
 599     stellaris_i2c_state *s = (stellaris_i2c_state *)opaque;
 600
 601     offset -= s->base;
 602     switch (offset) {
 603     case 0x00: /* MSA */
 604         return s->msa;
 605     case 0x04: /* MCS */
 606         /* We don't emulate timing, so the controller is never busy.  */
 607         return s->mcs | STELLARIS_I2C_MCS_IDLE;
 608     case 0x08: /* MDR */
 609         return s->mdr;
 610     case 0x0c: /* MTPR */
 611         return s->mtpr;
 612     case 0x10: /* MIMR */
 613         return s->mimr;
 614     case 0x14: /* MRIS */
 615         return s->mris;
 616     case 0x18: /* MMIS */
 617         return s->mris & s->mimr;
 618     case 0x20: /* MCR */
 619         return s->mcr;
 620     default:
 621         cpu_abort(cpu_single_env, "strllaris_i2c_read: Bad offset 0x%x\n",
 622                   (int)offset);
 623         return 0;
 624     }
 625 }
 626
 627 static void stellaris_i2c_update(stellaris_i2c_state *s)
 628 {
 629     int level;
 630
 631     level = (s->mris & s->mimr) != 0;
 632     qemu_set_irq(s->irq, level);
 633 }
 634
 635 static void stellaris_i2c_write(void *opaque, target_phys_addr_t offset,
 636                                 uint32_t value)
 637 {
 638     stellaris_i2c_state *s = (stellaris_i2c_state *)opaque;
 639
 640     offset -= s->base;
 641     switch (offset) {
 642     case 0x00: /* MSA */
 643         s->msa = value & 0xff;
 644         break;
 645     case 0x04: /* MCS */
 646         if ((s->mcr & 0x10) == 0) {
 647             /* Disabled.  Do nothing.  */
 648             break;
 649         }
 650         /* Grab the bus if this is starting a transfer.  */
 651         if ((value & 2) && (s->mcs & STELLARIS_I2C_MCS_BUSBSY) == 0) {
 652             if (i2c_start_transfer(s->bus, s->msa >> 1, s->msa & 1)) {
 653                 s->mcs |= STELLARIS_I2C_MCS_ARBLST;
 654             } else {
 655                 s->mcs &= ~STELLARIS_I2C_MCS_ARBLST;
 656                 s->mcs |= STELLARIS_I2C_MCS_BUSBSY;
 657             }
 658         }
 659         /* If we don't have the bus then indicate an error.  */
 660         if (!i2c_bus_busy(s->bus)
 661                 || (s->mcs & STELLARIS_I2C_MCS_BUSBSY) == 0) {
 662             s->mcs |= STELLARIS_I2C_MCS_ERROR;
 663             break;
 664         }
 665         s->mcs &= ~STELLARIS_I2C_MCS_ERROR;
 666         if (value & 1) {
 667             /* Transfer a byte.  */
 668             /* TODO: Handle errors.  */
 669             if (s->msa & 1) {
 670                 /* Recv */
 671                 s->mdr = i2c_recv(s->bus) & 0xff;
 672             } else {
 673                 /* Send */
 674                 i2c_send(s->bus, s->mdr);
 675             }
 676             /* Raise an interrupt.  */
 677             s->mris |= 1;
 678         }
 679         if (value & 4) {
 680             /* Finish transfer.  */
 681             i2c_end_transfer(s->bus);
 682             s->mcs &= ~STELLARIS_I2C_MCS_BUSBSY;
 683         }
 684         break;
 685     case 0x08: /* MDR */
 686         s->mdr = value & 0xff;
 687         break;
 688     case 0x0c: /* MTPR */
 689         s->mtpr = value & 0xff;
 690         break;
 691     case 0x10: /* MIMR */
 692         s->mimr = 1;
 693         break;
 694     case 0x1c: /* MICR */
 695         s->mris &= ~value;
 696         break;
 697     case 0x20: /* MCR */
 698         if (value & 1)
 699             cpu_abort(cpu_single_env,
 700                       "stellaris_i2c_write: Loopback not implemented\n");
 701         if (value & 0x20)
 702             cpu_abort(cpu_single_env,
 703                       "stellaris_i2c_write: Slave mode not implemented\n");
 704         s->mcr = value & 0x31;
 705         break;
 706     default:
 707         cpu_abort(cpu_single_env, "stellaris_i2c_write: Bad offset 0x%x\n",
 708                   (int)offset);
 709     }
 710     stellaris_i2c_update(s);
 711 }
 712
 713 static void stellaris_i2c_reset(stellaris_i2c_state *s)
 714 {
 715     if (s->mcs & STELLARIS_I2C_MCS_BUSBSY)
 716         i2c_end_transfer(s->bus);
 717
 718     s->msa = 0;
 719     s->mcs = 0;
 720     s->mdr = 0;
 721     s->mtpr = 1;
 722     s->mimr = 0;
 723     s->mris = 0;
 724     s->mcr = 0;
 725     stellaris_i2c_update(s);
 726 }
 727
 728 static CPUReadMemoryFunc *stellaris_i2c_readfn[] = {
 729    stellaris_i2c_read,
 730    stellaris_i2c_read,
 731    stellaris_i2c_read
 732 };
 733
 734 static CPUWriteMemoryFunc *stellaris_i2c_writefn[] = {
 735    stellaris_i2c_write,
 736    stellaris_i2c_write,
 737    stellaris_i2c_write
 738 };
 739
 740 static void stellaris_i2c_init(uint32_t base, qemu_irq irq, i2c_bus *bus)
 741 {
 742     stellaris_i2c_state *s;
 743     int iomemtype;
 744
 745     s = (stellaris_i2c_state *)qemu_mallocz(sizeof(stellaris_i2c_state));
 746     s->base = base;
 747     s->irq = irq;
 748     s->bus = bus;
 749
 750     iomemtype = cpu_register_io_memory(0, stellaris_i2c_readfn,
 751                                        stellaris_i2c_writefn, s);
 752     cpu_register_physical_memory(base, 0x00001000, iomemtype);
 753     /* ??? For now we only implement the master interface.  */
 754     stellaris_i2c_reset(s);
 755 }
 756
 757 /* Analogue to Digital Converter.  This is only partially implemented,
 758    enough for applications that use a combined ADC and timer tick.  */
 759
 760 #define STELLARIS_ADC_EM_CONTROLLER 0
 761 #define STELLARIS_ADC_EM_COMP       1
 762 #define STELLARIS_ADC_EM_EXTERNAL   4
 763 #define STELLARIS_ADC_EM_TIMER      5
 764 #define STELLARIS_ADC_EM_PWM0       6
 765 #define STELLARIS_ADC_EM_PWM1       7
 766 #define STELLARIS_ADC_EM_PWM2       8
 767
 768 #define STELLARIS_ADC_FIFO_EMPTY    0x0100
 769 #define STELLARIS_ADC_FIFO_FULL     0x1000
 770
 771 typedef struct
 772 {
 773     uint32_t base;
 774     uint32_t actss;
 775     uint32_t ris;
 776     uint32_t im;
 777     uint32_t emux;
 778     uint32_t ostat;
 779     uint32_t ustat;
 780     uint32_t sspri;
 781     uint32_t sac;
 782     struct {
 783         uint32_t state;
 784         uint32_t data[16];
 785     } fifo[4];
 786     uint32_t ssmux[4];
 787     uint32_t ssctl[4];
 788     qemu_irq irq;
 789 } stellaris_adc_state;
 790
 791 static uint32_t stellaris_adc_fifo_read(stellaris_adc_state *s, int n)
 792 {
 793     int tail;
 794
 795     tail = s->fifo[n].state & 0xf;
 796     if (s->fifo[n].state & STELLARIS_ADC_FIFO_EMPTY) {
 797         s->ustat |= 1 << n;
 798     } else {
 799         s->fifo[n].state = (s->fifo[n].state & ~0xf) | ((tail + 1) & 0xf);
 800         s->fifo[n].state &= ~STELLARIS_ADC_FIFO_FULL;
 801         if (tail + 1 == ((s->fifo[n].state >> 4) & 0xf))
 802             s->fifo[n].state |= STELLARIS_ADC_FIFO_EMPTY;
 803     }
 804     return s->fifo[n].data[tail];
 805 }
 806
 807 static void stellaris_adc_fifo_write(stellaris_adc_state *s, int n,
 808                                      uint32_t value)
 809 {
 810     int head;
 811
 812     head = (s->fifo[n].state >> 4) & 0xf;
 813     if (s->fifo[n].state & STELLARIS_ADC_FIFO_FULL) {
 814         s->ostat |= 1 << n;
 815         return;
 816     }
 817     s->fifo[n].data[head] = value;
 818     head = (head + 1) & 0xf;
 819     s->fifo[n].state &= ~STELLARIS_ADC_FIFO_EMPTY;
 820     s->fifo[n].state = (s->fifo[n].state & ~0xf0) | (head << 4);
 821     if ((s->fifo[n].state & 0xf) == head)
 822         s->fifo[n].state |= STELLARIS_ADC_FIFO_FULL;
 823 }
 824
 825 static void stellaris_adc_update(stellaris_adc_state *s)
 826 {
 827     int level;
 828
 829     level = (s->ris & s->im) != 0;
 830     qemu_set_irq(s->irq, level);
 831 }
 832
 833 static void stellaris_adc_trigger(void *opaque, int irq, int level)
 834 {
 835     stellaris_adc_state *s = (stellaris_adc_state *)opaque;
 836     /* Some applications use the ADC as a random number source, so introduce
 837        some variation into the signal.  */
 838     static uint32_t noise = 0;
 839
 840     if ((s->actss & 1) == 0) {
 841         return;
 842     }
 843
 844     noise = noise * 314159 + 1;
 845     /* ??? actual inputs not implemented.  Return an arbitrary value.  */
 846     stellaris_adc_fifo_write(s, 0, 0x200 + ((noise >> 16) & 7));
 847     s->ris |= 1;
 848     stellaris_adc_update(s);
 849 }
 850
 851 static void stellaris_adc_reset(stellaris_adc_state *s)
 852 {
 853     int n;
 854
 855     for (n = 0; n < 4; n++) {
 856         s->ssmux[n] = 0;
 857         s->ssctl[n] = 0;
 858         s->fifo[n].state = STELLARIS_ADC_FIFO_EMPTY;
 859     }
 860 }
 861
 862 static uint32_t stellaris_adc_read(void *opaque, target_phys_addr_t offset)
 863 {
 864     stellaris_adc_state *s = (stellaris_adc_state *)opaque;
 865
 866     /* TODO: Implement this.  */
 867     offset -= s->base;
 868     if (offset >= 0x40 && offset < 0xc0) {
 869         int n;
 870         n = (offset - 0x40) >> 5;
 871         switch (offset & 0x1f) {
 872         case 0x00: /* SSMUX */
 873             return s->ssmux[n];
 874         case 0x04: /* SSCTL */
 875             return s->ssctl[n];
 876         case 0x08: /* SSFIFO */
 877             return stellaris_adc_fifo_read(s, n);
 878         case 0x0c: /* SSFSTAT */
 879             return s->fifo[n].state;
 880         default:
 881             break;
 882         }
 883     }
 884     switch (offset) {
 885     case 0x00: /* ACTSS */
 886         return s->actss;
 887     case 0x04: /* RIS */
 888         return s->ris;
 889     case 0x08: /* IM */
 890         return s->im;
 891     case 0x0c: /* ISC */
 892         return s->ris & s->im;
 893     case 0x10: /* OSTAT */
 894         return s->ostat;
 895     case 0x14: /* EMUX */
 896         return s->emux;
 897     case 0x18: /* USTAT */
 898         return s->ustat;
 899     case 0x20: /* SSPRI */
 900         return s->sspri;
 901     case 0x30: /* SAC */
 902         return s->sac;
 903     default:
 904         cpu_abort(cpu_single_env, "strllaris_adc_read: Bad offset 0x%x\n",
 905                   (int)offset);
 906         return 0;
 907     }
 908 }
 909
 910 static void stellaris_adc_write(void *opaque, target_phys_addr_t offset,
 911                                 uint32_t value)
 912 {
 913     stellaris_adc_state *s = (stellaris_adc_state *)opaque;
 914
 915     /* TODO: Implement this.  */
 916     offset -= s->base;
 917     if (offset >= 0x40 && offset < 0xc0) {
 918         int n;
 919         n = (offset - 0x40) >> 5;
 920         switch (offset & 0x1f) {
 921         case 0x00: /* SSMUX */
 922             s->ssmux[n] = value & 0x33333333;
 923             return;
 924         case 0x04: /* SSCTL */
 925             if (value != 6) {
 926                 cpu_abort(cpu_single_env, "ADC: Unimplemented sequence %x\n",
 927                           value);
 928             }
 929             s->ssctl[n] = value;
 930             return;
 931         default:
 932             break;
 933         }
 934     }
 935     switch (offset) {
 936     case 0x00: /* ACTSS */
 937         s->actss = value & 0xf;
 938         if (value & 0xe) {
 939             cpu_abort(cpu_single_env,
 940                       "Not implemented:  ADC sequencers 1-3\n");
 941         }
 942         break;
 943     case 0x08: /* IM */
 944         s->im = value;
 945         break;
 946     case 0x0c: /* ISC */
 947         s->ris &= ~value;
 948         break;
 949     case 0x10: /* OSTAT */
 950         s->ostat &= ~value;
 951         break;
 952     case 0x14: /* EMUX */
 953         s->emux = value;
 954         break;
 955     case 0x18: /* USTAT */
 956         s->ustat &= ~value;
 957         break;
 958     case 0x20: /* SSPRI */
 959         s->sspri = value;
 960         break;
 961     case 0x28: /* PSSI */
 962         cpu_abort(cpu_single_env, "Not implemented:  ADC sample initiate\n");
 963         break;
 964     case 0x30: /* SAC */
 965         s->sac = value;
 966         break;
 967     default:
 968         cpu_abort(cpu_single_env, "stellaris_adc_write: Bad offset 0x%x\n",
 969                   (int)offset);
 970     }
 971     stellaris_adc_update(s);
 972 }
 973
 974 static CPUReadMemoryFunc *stellaris_adc_readfn[] = {
 975    stellaris_adc_read,
 976    stellaris_adc_read,
 977    stellaris_adc_read
 978 };
 979
 980 static CPUWriteMemoryFunc *stellaris_adc_writefn[] = {
 981    stellaris_adc_write,
 982    stellaris_adc_write,
 983    stellaris_adc_write
 984 };
 985
 986 static qemu_irq stellaris_adc_init(uint32_t base, qemu_irq irq)
 987 {
 988     stellaris_adc_state *s;
 989     int iomemtype;
 990     qemu_irq *qi;
 991
 992     s = (stellaris_adc_state *)qemu_mallocz(sizeof(stellaris_adc_state));
 993     s->base = base;
 994     s->irq = irq;
 995
 996     iomemtype = cpu_register_io_memory(0, stellaris_adc_readfn,
 997                                        stellaris_adc_writefn, s);
 998     cpu_register_physical_memory(base, 0x00001000, iomemtype);
 999     stellaris_adc_reset(s);
1000     qi = qemu_allocate_irqs(stellaris_adc_trigger, s, 1);
1001     return qi[0];
1002 }
1003
1004 /* Some boards have both an OLED controller and SD card connected to
1005    the same SSI port, with the SD card chip select connected to a
1006    GPIO pin.  Technically the OLED chip select is connected to the SSI
1007    Fss pin.  We do not bother emulating that as both devices should
1008    never be selected simultaneously, and our OLED controller ignores stray
1009    0xff commands that occur when deselecting the SD card.  */
1010
1011 typedef struct {
1012     ssi_xfer_cb xfer_cb[2];
1013     void *opaque[2];
1014     qemu_irq irq;
1015     int current_dev;
1016 } stellaris_ssi_bus_state;
1017
1018 static void stellaris_ssi_bus_select(void *opaque, int irq, int level)
1019 {
1020     stellaris_ssi_bus_state *s = (stellaris_ssi_bus_state *)opaque;
1021
1022     s->current_dev = level;
1023 }
1024
1025 static int stellaris_ssi_bus_xfer(void *opaque, int val)
1026 {
1027     stellaris_ssi_bus_state *s = (stellaris_ssi_bus_state *)opaque;
1028
1029     return s->xfer_cb[s->current_dev](s->opaque[s->current_dev], val);
1030 }
1031
1032 static void *stellaris_ssi_bus_init(qemu_irq *irqp,
1033                                     ssi_xfer_cb cb0, void *opaque0,
1034                                     ssi_xfer_cb cb1, void *opaque1)
1035 {
1036     qemu_irq *qi;
1037     stellaris_ssi_bus_state *s;
1038
1039     s = (stellaris_ssi_bus_state *)qemu_mallocz(sizeof(stellaris_ssi_bus_state));
1040     s->xfer_cb[0] = cb0;
1041     s->opaque[0] = opaque0;
1042     s->xfer_cb[1] = cb1;
1043     s->opaque[1] = opaque1;
1044     qi = qemu_allocate_irqs(stellaris_ssi_bus_select, s, 1);
1045     *irqp = *qi;
1046     return s;
1047 }
1048
1049 /* Board init.  */
1050 static stellaris_board_info stellaris_boards[] = {
1051   { "LM3S811EVB",
1052     0,
1053     0x0032000e,
1054     0x001f001f, /* dc0 */
1055     0x001132bf,
1056     0x01071013,
1057     0x3f0f01ff,
1058     0x0000001f,
1059     BP_OLED_I2C
1060   },
1061   { "LM3S6965EVB",
1062     0x10010002,
1063     0x1073402e,
1064     0x00ff007f, /* dc0 */
1065     0x001133ff,
1066     0x030f5317,
1067     0x0f0f87ff,
1068     0x5000007f,
1069     BP_OLED_SSI | BP_GAMEPAD
1070   }
1071 };
1072
1073 static void stellaris_init(const char *kernel_filename, const char *cpu_model,
1074                            DisplayState *ds, stellaris_board_info *board)
1075 {
1076     static const int uart_irq[] = {5, 6, 33, 34};
1077     static const int timer_irq[] = {19, 21, 23, 35};
1078     static const uint32_t gpio_addr[7] =
1079       { 0x40004000, 0x40005000, 0x40006000, 0x40007000,
1080         0x40024000, 0x40025000, 0x40026000};
1081     static const int gpio_irq[7] = {0, 1, 2, 3, 4, 30, 31};
1082
1083     qemu_irq *pic;
1084     qemu_irq *gpio_in[5];
1085     qemu_irq *gpio_out[5];
1086     qemu_irq adc;
1087     int sram_size;
1088     int flash_size;
1089     i2c_bus *i2c;
1090     int i;
1091
1092     flash_size = ((board->dc0 & 0xffff) + 1) << 1;
1093     sram_size = (board->dc0 >> 18) + 1;
1094     pic = armv7m_init(flash_size, sram_size, kernel_filename, cpu_model);
1095
1096     if (board->dc1 & (1 << 16)) {
1097         adc = stellaris_adc_init(0x40038000, pic[14]);
1098     } else {
1099         adc = NULL;
1100     }
1101     for (i = 0; i < 4; i++) {
1102         if (board->dc2 & (0x10000 << i)) {
1103             stellaris_gptm_init(0x40030000 + i * 0x1000,
1104                                 pic[timer_irq[i]], adc);
1105         }
1106     }
1107
1108     stellaris_sys_init(0x400fe000, pic[28], board, nd_table[0].macaddr);
1109
1110     for (i = 0; i < 7; i++) {
1111         if (board->dc4 & (1 << i)) {
1112             gpio_in[i] = pl061_init(gpio_addr[i], pic[gpio_irq[i]],
1113                                     &gpio_out[i]);
1114         }
1115     }
1116
1117     if (board->dc2 & (1 << 12)) {
1118         i2c = i2c_init_bus();
1119         stellaris_i2c_init(0x40020000, pic[8], i2c);
1120         if (board->peripherals & BP_OLED_I2C) {
1121             ssd0303_init(ds, i2c, 0x3d);
1122         }
1123     }
1124
1125     for (i = 0; i < 4; i++) {
1126         if (board->dc2 & (1 << i)) {
1127             pl011_init(0x4000c000 + i * 0x1000, pic[uart_irq[i]],
1128                        serial_hds[i], PL011_LUMINARY);
1129         }
1130     }
1131     if (board->dc2 & (1 << 4)) {
1132         if (board->peripherals & BP_OLED_SSI) {
1133             void * oled;
1134             void * sd;
1135             void *ssi_bus;
1136
1137             oled = ssd0323_init(ds, &gpio_out[GPIO_C][7]);
1138             sd = ssi_sd_init(sd_bdrv);
1139
1140             ssi_bus = stellaris_ssi_bus_init(&gpio_out[GPIO_D][0],
1141                                              ssi_sd_xfer, sd,
1142                                              ssd0323_xfer_ssi, oled);
1143
1144             pl022_init(0x40008000, pic[7], stellaris_ssi_bus_xfer, ssi_bus);
1145             /* Make sure the select pin is high.  */
1146             qemu_irq_raise(gpio_out[GPIO_D][0]);
1147         } else {
1148             pl022_init(0x40008000, pic[7], NULL, NULL);
1149         }
1150     }
1151     if (board->dc4 & (1 << 28)) {
1152         /* FIXME: Obey network model.  */
1153         stellaris_enet_init(&nd_table[0], 0x40048000, pic[42]);
1154     }
1155     if (board->peripherals & BP_GAMEPAD) {
1156         qemu_irq gpad_irq[5];
1157         static const int gpad_keycode[5] = { 0xc8, 0xd0, 0xcb, 0xcd, 0x1d };
1158
1159         gpad_irq[0] = qemu_irq_invert(gpio_in[GPIO_E][0]); /* up */
1160         gpad_irq[1] = qemu_irq_invert(gpio_in[GPIO_E][1]); /* down */
1161         gpad_irq[2] = qemu_irq_invert(gpio_in[GPIO_E][2]); /* left */
1162         gpad_irq[3] = qemu_irq_invert(gpio_in[GPIO_E][3]); /* right */
1163         gpad_irq[4] = qemu_irq_invert(gpio_in[GPIO_F][1]); /* select */
1164
1165         stellaris_gamepad_init(5, gpad_irq, gpad_keycode);
1166     }
1167 }
1168
1169 /* FIXME: Figure out how to generate these from stellaris_boards.  */
1170 static void lm3s811evb_init(int ram_size, int vga_ram_size,
1171                      const char *boot_device, DisplayState *ds,
1172                      const char *kernel_filename, const char *kernel_cmdline,
1173                      const char *initrd_filename, const char *cpu_model)
1174 {
1175     stellaris_init(kernel_filename, cpu_model, ds, &stellaris_boards[0]);
1176 }
1177
1178 static void lm3s6965evb_init(int ram_size, int vga_ram_size,
1179                      const char *boot_device, DisplayState *ds,
1180                      const char *kernel_filename, const char *kernel_cmdline,
1181                      const char *initrd_filename, const char *cpu_model)
1182 {
1183     stellaris_init(kernel_filename, cpu_model, ds, &stellaris_boards[1]);
1184 }
1185
1186 QEMUMachine lm3s811evb_machine = {
1187     "lm3s811evb",
1188     "Stellaris LM3S811EVB",
1189     lm3s811evb_init,
1190 };
1191
1192 QEMUMachine lm3s6965evb_machine = {
1193     "lm3s6965evb",
1194     "Stellaris LM3S6965EVB",
1195     lm3s6965evb_init,
1196 };