hw/arm_sysctl.c

   1 /*
   2  * Status and system control registers for ARM RealView/Versatile boards.
   3  *
   4  * Copyright (c) 2006-2007 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licensed under the GPL.
   8  */
   9
  10 #include "hw.h"
  11 #include "qemu-timer.h"
  12 #include "sysbus.h"
  13 #include "primecell.h"
  14 #include "sysemu.h"
  15
  16 #define LOCK_VALUE 0xa05f
  17
  18 typedef struct {
  19     SysBusDevice busdev;
  20     MemoryRegion iomem;
  21     qemu_irq pl110_mux_ctrl;
  22
  23     uint32_t sys_id;
  24     uint32_t leds;
  25     uint16_t lockval;
  26     uint32_t cfgdata1;
  27     uint32_t cfgdata2;
  28     uint32_t flags;
  29     uint32_t nvflags;
  30     uint32_t resetlevel;
  31     uint32_t proc_id;
  32     uint32_t sys_mci;
  33     uint32_t sys_cfgdata;
  34     uint32_t sys_cfgctrl;
  35     uint32_t sys_cfgstat;
  36     uint32_t sys_clcd;
  37 } arm_sysctl_state;
  38
  39 static const VMStateDescription vmstate_arm_sysctl = {
  40     .name = "realview_sysctl",
  41     .version_id = 3,
  42     .minimum_version_id = 1,
  43     .fields = (VMStateField[]) {
  44         VMSTATE_UINT32(leds, arm_sysctl_state),
  45         VMSTATE_UINT16(lockval, arm_sysctl_state),
  46         VMSTATE_UINT32(cfgdata1, arm_sysctl_state),
  47         VMSTATE_UINT32(cfgdata2, arm_sysctl_state),
  48         VMSTATE_UINT32(flags, arm_sysctl_state),
  49         VMSTATE_UINT32(nvflags, arm_sysctl_state),
  50         VMSTATE_UINT32(resetlevel, arm_sysctl_state),
  51         VMSTATE_UINT32_V(sys_mci, arm_sysctl_state, 2),
  52         VMSTATE_UINT32_V(sys_cfgdata, arm_sysctl_state, 2),
  53         VMSTATE_UINT32_V(sys_cfgctrl, arm_sysctl_state, 2),
  54         VMSTATE_UINT32_V(sys_cfgstat, arm_sysctl_state, 2),
  55         VMSTATE_UINT32_V(sys_clcd, arm_sysctl_state, 3),
  56         VMSTATE_END_OF_LIST()
  57     }
  58 };
  59
  60 /* The PB926 actually uses a different format for
  61  * its SYS_ID register. Fortunately the bits which are
  62  * board type on later boards are distinct.
  63  */
  64 #define BOARD_ID_PB926 0x100
  65 #define BOARD_ID_EB 0x140
  66 #define BOARD_ID_PBA8 0x178
  67 #define BOARD_ID_PBX 0x182
  68 #define BOARD_ID_VEXPRESS 0x190
  69
  70 static int board_id(arm_sysctl_state *s)
  71 {
  72     /* Extract the board ID field from the SYS_ID register value */
  73     return (s->sys_id >> 16) & 0xfff;
  74 }
  75
  76 static void arm_sysctl_reset(DeviceState *d)
  77 {
  78     arm_sysctl_state *s = FROM_SYSBUS(arm_sysctl_state, sysbus_from_qdev(d));
  79
  80     s->leds = 0;
  81     s->lockval = 0;
  82     s->cfgdata1 = 0;
  83     s->cfgdata2 = 0;
  84     s->flags = 0;
  85     s->resetlevel = 0;
  86     if (board_id(s) == BOARD_ID_VEXPRESS) {
  87         /* On VExpress this register will RAZ/WI */
  88         s->sys_clcd = 0;
  89     } else {
  90         /* All others: CLCDID 0x1f, indicating VGA */
  91         s->sys_clcd = 0x1f00;
  92     }
  93 }
  94
  95 static uint64_t arm_sysctl_read(void *opaque, hwaddr offset,
  96                                 unsigned size)
  97 {
  98     arm_sysctl_state *s = (arm_sysctl_state *)opaque;
  99
 100     switch (offset) {
 101     case 0x00: /* ID */
 102         return s->sys_id;
 103     case 0x04: /* SW */
 104         /* General purpose hardware switches.
 105            We don't have a useful way of exposing these to the user.  */
 106         return 0;
 107     case 0x08: /* LED */
 108         return s->leds;
 109     case 0x20: /* LOCK */
 110         return s->lockval;
 111     case 0x0c: /* OSC0 */
 112     case 0x10: /* OSC1 */
 113     case 0x14: /* OSC2 */
 114     case 0x18: /* OSC3 */
 115     case 0x1c: /* OSC4 */
 116     case 0x24: /* 100HZ */
 117         /* ??? Implement these.  */
 118         return 0;
 119     case 0x28: /* CFGDATA1 */
 120         return s->cfgdata1;
 121     case 0x2c: /* CFGDATA2 */
 122         return s->cfgdata2;
 123     case 0x30: /* FLAGS */
 124         return s->flags;
 125     case 0x38: /* NVFLAGS */
 126         return s->nvflags;
 127     case 0x40: /* RESETCTL */
 128         if (board_id(s) == BOARD_ID_VEXPRESS) {
 129             /* reserved: RAZ/WI */
 130             return 0;
 131         }
 132         return s->resetlevel;
 133     case 0x44: /* PCICTL */
 134         return 1;
 135     case 0x48: /* MCI */
 136         return s->sys_mci;
 137     case 0x4c: /* FLASH */
 138         return 0;
 139     case 0x50: /* CLCD */
 140         return s->sys_clcd;
 141     case 0x54: /* CLCDSER */
 142         return 0;
 143     case 0x58: /* BOOTCS */
 144         return 0;
 145     case 0x5c: /* 24MHz */
 146         return muldiv64(qemu_get_clock_ns(vm_clock), 24000000, get_ticks_per_sec());
 147     case 0x60: /* MISC */
 148         return 0;
 149     case 0x84: /* PROCID0 */
 150         return s->proc_id;
 151     case 0x88: /* PROCID1 */
 152         return 0xff000000;
 153     case 0x64: /* DMAPSR0 */
 154     case 0x68: /* DMAPSR1 */
 155     case 0x6c: /* DMAPSR2 */
 156     case 0x70: /* IOSEL */
 157     case 0x74: /* PLDCTL */
 158     case 0x80: /* BUSID */
 159     case 0x8c: /* OSCRESET0 */
 160     case 0x90: /* OSCRESET1 */
 161     case 0x94: /* OSCRESET2 */
 162     case 0x98: /* OSCRESET3 */
 163     case 0x9c: /* OSCRESET4 */
 164     case 0xc0: /* SYS_TEST_OSC0 */
 165     case 0xc4: /* SYS_TEST_OSC1 */
 166     case 0xc8: /* SYS_TEST_OSC2 */
 167     case 0xcc: /* SYS_TEST_OSC3 */
 168     case 0xd0: /* SYS_TEST_OSC4 */
 169         return 0;
 170     case 0xa0: /* SYS_CFGDATA */
 171         if (board_id(s) != BOARD_ID_VEXPRESS) {
 172             goto bad_reg;
 173         }
 174         return s->sys_cfgdata;
 175     case 0xa4: /* SYS_CFGCTRL */
 176         if (board_id(s) != BOARD_ID_VEXPRESS) {
 177             goto bad_reg;
 178         }
 179         return s->sys_cfgctrl;
 180     case 0xa8: /* SYS_CFGSTAT */
 181         if (board_id(s) != BOARD_ID_VEXPRESS) {
 182             goto bad_reg;
 183         }
 184         return s->sys_cfgstat;
 185     default:
 186     bad_reg:
 187         qemu_log_mask(LOG_GUEST_ERROR,
 188                       "arm_sysctl_read: Bad register offset 0x%x\n",
 189                       (int)offset);
 190         return 0;
 191     }
 192 }
 193
 194 static void arm_sysctl_write(void *opaque, hwaddr offset,
 195                              uint64_t val, unsigned size)
 196 {
 197     arm_sysctl_state *s = (arm_sysctl_state *)opaque;
 198
 199     switch (offset) {
 200     case 0x08: /* LED */
 201         s->leds = val;
 202     case 0x0c: /* OSC0 */
 203     case 0x10: /* OSC1 */
 204     case 0x14: /* OSC2 */
 205     case 0x18: /* OSC3 */
 206     case 0x1c: /* OSC4 */
 207         /* ??? */
 208         break;
 209     case 0x20: /* LOCK */
 210         if (val == LOCK_VALUE)
 211             s->lockval = val;
 212         else
 213             s->lockval = val & 0x7fff;
 214         break;
 215     case 0x28: /* CFGDATA1 */
 216         /* ??? Need to implement this.  */
 217         s->cfgdata1 = val;
 218         break;
 219     case 0x2c: /* CFGDATA2 */
 220         /* ??? Need to implement this.  */
 221         s->cfgdata2 = val;
 222         break;
 223     case 0x30: /* FLAGSSET */
 224         s->flags |= val;
 225         break;
 226     case 0x34: /* FLAGSCLR */
 227         s->flags &= ~val;
 228         break;
 229     case 0x38: /* NVFLAGSSET */
 230         s->nvflags |= val;
 231         break;
 232     case 0x3c: /* NVFLAGSCLR */
 233         s->nvflags &= ~val;
 234         break;
 235     case 0x40: /* RESETCTL */
 236         switch (board_id(s)) {
 237         case BOARD_ID_PB926:
 238             if (s->lockval == LOCK_VALUE) {
 239                 s->resetlevel = val;
 240                 if (val & 0x100) {
 241                     qemu_system_reset_request();
 242                 }
 243             }
 244             break;
 245         case BOARD_ID_PBX:
 246         case BOARD_ID_PBA8:
 247             if (s->lockval == LOCK_VALUE) {
 248                 s->resetlevel = val;
 249                 if (val & 0x04) {
 250                     qemu_system_reset_request();
 251                 }
 252             }
 253             break;
 254         case BOARD_ID_VEXPRESS:
 255         case BOARD_ID_EB:
 256         default:
 257             /* reserved: RAZ/WI */
 258             break;
 259         }
 260         break;
 261     case 0x44: /* PCICTL */
 262         /* nothing to do.  */
 263         break;
 264     case 0x4c: /* FLASH */
 265         break;
 266     case 0x50: /* CLCD */
 267         switch (board_id(s)) {
 268         case BOARD_ID_PB926:
 269             /* On 926 bits 13:8 are R/O, bits 1:0 control
 270              * the mux that defines how to interpret the PL110
 271              * graphics format, and other bits are r/w but we
 272              * don't implement them to do anything.
 273              */
 274             s->sys_clcd &= 0x3f00;
 275             s->sys_clcd |= val & ~0x3f00;
 276             qemu_set_irq(s->pl110_mux_ctrl, val & 3);
 277             break;
 278         case BOARD_ID_EB:
 279             /* The EB is the same except that there is no mux since
 280              * the EB has a PL111.
 281              */
 282             s->sys_clcd &= 0x3f00;
 283             s->sys_clcd |= val & ~0x3f00;
 284             break;
 285         case BOARD_ID_PBA8:
 286         case BOARD_ID_PBX:
 287             /* On PBA8 and PBX bit 7 is r/w and all other bits
 288              * are either r/o or RAZ/WI.
 289              */
 290             s->sys_clcd &= (1 << 7);
 291             s->sys_clcd |= val & ~(1 << 7);
 292             break;
 293         case BOARD_ID_VEXPRESS:
 294         default:
 295             /* On VExpress this register is unimplemented and will RAZ/WI */
 296             break;
 297         }
 298     case 0x54: /* CLCDSER */
 299     case 0x64: /* DMAPSR0 */
 300     case 0x68: /* DMAPSR1 */
 301     case 0x6c: /* DMAPSR2 */
 302     case 0x70: /* IOSEL */
 303     case 0x74: /* PLDCTL */
 304     case 0x80: /* BUSID */
 305     case 0x84: /* PROCID0 */
 306     case 0x88: /* PROCID1 */
 307     case 0x8c: /* OSCRESET0 */
 308     case 0x90: /* OSCRESET1 */
 309     case 0x94: /* OSCRESET2 */
 310     case 0x98: /* OSCRESET3 */
 311     case 0x9c: /* OSCRESET4 */
 312         break;
 313     case 0xa0: /* SYS_CFGDATA */
 314         if (board_id(s) != BOARD_ID_VEXPRESS) {
 315             goto bad_reg;
 316         }
 317         s->sys_cfgdata = val;
 318         return;
 319     case 0xa4: /* SYS_CFGCTRL */
 320         if (board_id(s) != BOARD_ID_VEXPRESS) {
 321             goto bad_reg;
 322         }
 323         s->sys_cfgctrl = val & ~(3 << 18);
 324         s->sys_cfgstat = 1;            /* complete */
 325         switch (s->sys_cfgctrl) {
 326         case 0xc0800000:            /* SYS_CFG_SHUTDOWN to motherboard */
 327             qemu_system_shutdown_request();
 328             break;
 329         case 0xc0900000:            /* SYS_CFG_REBOOT to motherboard */
 330             qemu_system_reset_request();
 331             break;
 332         default:
 333             s->sys_cfgstat |= 2;        /* error */
 334         }
 335         return;
 336     case 0xa8: /* SYS_CFGSTAT */
 337         if (board_id(s) != BOARD_ID_VEXPRESS) {
 338             goto bad_reg;
 339         }
 340         s->sys_cfgstat = val & 3;
 341         return;
 342     default:
 343     bad_reg:
 344         qemu_log_mask(LOG_GUEST_ERROR,
 345                       "arm_sysctl_write: Bad register offset 0x%x\n",
 346                       (int)offset);
 347         return;
 348     }
 349 }
 350
 351 static const MemoryRegionOps arm_sysctl_ops = {
 352     .read = arm_sysctl_read,
 353     .write = arm_sysctl_write,
 354     .endianness = DEVICE_NATIVE_ENDIAN,
 355 };
 356
 357 static void arm_sysctl_gpio_set(void *opaque, int line, int level)
 358 {
 359     arm_sysctl_state *s = (arm_sysctl_state *)opaque;
 360     switch (line) {
 361     case ARM_SYSCTL_GPIO_MMC_WPROT:
 362     {
 363         /* For PB926 and EB write-protect is bit 2 of SYS_MCI;
 364          * for all later boards it is bit 1.
 365          */
 366         int bit = 2;
 367         if ((board_id(s) == BOARD_ID_PB926) || (board_id(s) == BOARD_ID_EB)) {
 368             bit = 4;
 369         }
 370         s->sys_mci &= ~bit;
 371         if (level) {
 372             s->sys_mci |= bit;
 373         }
 374         break;
 375     }
 376     case ARM_SYSCTL_GPIO_MMC_CARDIN:
 377         s->sys_mci &= ~1;
 378         if (level) {
 379             s->sys_mci |= 1;
 380         }
 381         break;
 382     }
 383 }
 384
 385 static int arm_sysctl_init(SysBusDevice *dev)
 386 {
 387     arm_sysctl_state *s = FROM_SYSBUS(arm_sysctl_state, dev);
 388
 389     memory_region_init_io(&s->iomem, &arm_sysctl_ops, s, "arm-sysctl", 0x1000);
 390     sysbus_init_mmio(dev, &s->iomem);
 391     qdev_init_gpio_in(&s->busdev.qdev, arm_sysctl_gpio_set, 2);
 392     qdev_init_gpio_out(&s->busdev.qdev, &s->pl110_mux_ctrl, 1);
 393     return 0;
 394 }
 395
 396 static Property arm_sysctl_properties[] = {
 397     DEFINE_PROP_UINT32("sys_id", arm_sysctl_state, sys_id, 0),
 398     DEFINE_PROP_UINT32("proc_id", arm_sysctl_state, proc_id, 0),
 399     DEFINE_PROP_END_OF_LIST(),
 400 };
 401
 402 static void arm_sysctl_class_init(ObjectClass *klass, void *data)
 403 {
 404     DeviceClass *dc = DEVICE_CLASS(klass);
 405     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 406
 407     k->init = arm_sysctl_init;
 408     dc->reset = arm_sysctl_reset;
 409     dc->vmsd = &vmstate_arm_sysctl;
 410     dc->props = arm_sysctl_properties;
 411 }
 412
 413 static TypeInfo arm_sysctl_info = {
 414     .name          = "realview_sysctl",
 415     .parent        = TYPE_SYS_BUS_DEVICE,
 416     .instance_size = sizeof(arm_sysctl_state),
 417     .class_init    = arm_sysctl_class_init,
 418 };
 419
 420 static void arm_sysctl_register_types(void)
 421 {
 422     type_register_static(&arm_sysctl_info);
 423 }
 424
 425 type_init(arm_sysctl_register_types)