hw/gpio/pl061.c

   1 /*
   2  * Arm PrimeCell PL061 General Purpose IO with additional
   3  * Luminary Micro Stellaris bits.
   4  *
   5  * Copyright (c) 2007 CodeSourcery.
   6  * Written by Paul Brook
   7  *
   8  * This code is licensed under the GPL.
   9  */
  10
  11 #include "hw/sysbus.h"
  12
  13 //#define DEBUG_PL061 1
  14
  15 #ifdef DEBUG_PL061
  16 #define DPRINTF(fmt, ...) \
  17 do { printf("pl061: " fmt , ## __VA_ARGS__); } while (0)
  18 #define BADF(fmt, ...) \
  19 do { fprintf(stderr, "pl061: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
  20 #else
  21 #define DPRINTF(fmt, ...) do {} while(0)
  22 #define BADF(fmt, ...) \
  23 do { fprintf(stderr, "pl061: error: " fmt , ## __VA_ARGS__);} while (0)
  24 #endif
  25
  26 static const uint8_t pl061_id[12] =
  27   { 0x00, 0x00, 0x00, 0x00, 0x61, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
  28 static const uint8_t pl061_id_luminary[12] =
  29   { 0x00, 0x00, 0x00, 0x00, 0x61, 0x00, 0x18, 0x01, 0x0d, 0xf0, 0x05, 0xb1 };
  30
  31 #define TYPE_PL061 "pl061"
  32 #define PL061(obj) OBJECT_CHECK(PL061State, (obj), TYPE_PL061)
  33
  34 typedef struct PL061State {
  35     SysBusDevice parent_obj;
  36
  37     MemoryRegion iomem;
  38     uint32_t locked;
  39     uint32_t data;
  40     uint32_t old_out_data;
  41     uint32_t old_in_data;
  42     uint32_t dir;
  43     uint32_t isense;
  44     uint32_t ibe;
  45     uint32_t iev;
  46     uint32_t im;
  47     uint32_t istate;
  48     uint32_t afsel;
  49     uint32_t dr2r;
  50     uint32_t dr4r;
  51     uint32_t dr8r;
  52     uint32_t odr;
  53     uint32_t pur;
  54     uint32_t pdr;
  55     uint32_t slr;
  56     uint32_t den;
  57     uint32_t cr;
  58     uint32_t float_high;
  59     uint32_t amsel;
  60     qemu_irq irq;
  61     qemu_irq out[8];
  62     const unsigned char *id;
  63 } PL061State;
  64
  65 static const VMStateDescription vmstate_pl061 = {
  66     .name = "pl061",
  67     .version_id = 3,
  68     .minimum_version_id = 3,
  69     .fields = (VMStateField[]) {
  70         VMSTATE_UINT32(locked, PL061State),
  71         VMSTATE_UINT32(data, PL061State),
  72         VMSTATE_UINT32(old_out_data, PL061State),
  73         VMSTATE_UINT32(old_in_data, PL061State),
  74         VMSTATE_UINT32(dir, PL061State),
  75         VMSTATE_UINT32(isense, PL061State),
  76         VMSTATE_UINT32(ibe, PL061State),
  77         VMSTATE_UINT32(iev, PL061State),
  78         VMSTATE_UINT32(im, PL061State),
  79         VMSTATE_UINT32(istate, PL061State),
  80         VMSTATE_UINT32(afsel, PL061State),
  81         VMSTATE_UINT32(dr2r, PL061State),
  82         VMSTATE_UINT32(dr4r, PL061State),
  83         VMSTATE_UINT32(dr8r, PL061State),
  84         VMSTATE_UINT32(odr, PL061State),
  85         VMSTATE_UINT32(pur, PL061State),
  86         VMSTATE_UINT32(pdr, PL061State),
  87         VMSTATE_UINT32(slr, PL061State),
  88         VMSTATE_UINT32(den, PL061State),
  89         VMSTATE_UINT32(cr, PL061State),
  90         VMSTATE_UINT32(float_high, PL061State),
  91         VMSTATE_UINT32_V(amsel, PL061State, 2),
  92         VMSTATE_END_OF_LIST()
  93     }
  94 };
  95
  96 static void pl061_update(PL061State *s)
  97 {
  98     uint8_t changed;
  99     uint8_t mask;
 100     uint8_t out;
 101     int i;
 102
 103     DPRINTF("dir = %d, data = %d\n", s->dir, s->data);
 104
 105     /* Outputs float high.  */
 106     /* FIXME: This is board dependent.  */
 107     out = (s->data & s->dir) | ~s->dir;
 108     changed = s->old_out_data ^ out;
 109     if (changed) {
 110         s->old_out_data = out;
 111         for (i = 0; i < 8; i++) {
 112             mask = 1 << i;
 113             if (changed & mask) {
 114                 DPRINTF("Set output %d = %d\n", i, (out & mask) != 0);
 115                 qemu_set_irq(s->out[i], (out & mask) != 0);
 116             }
 117         }
 118     }
 119
 120     /* Inputs */
 121     changed = (s->old_in_data ^ s->data) & ~s->dir;
 122     if (changed) {
 123         s->old_in_data = s->data;
 124         for (i = 0; i < 8; i++) {
 125             mask = 1 << i;
 126             if (changed & mask) {
 127                 DPRINTF("Changed input %d = %d\n", i, (s->data & mask) != 0);
 128
 129                 if (!(s->isense & mask)) {
 130                     /* Edge interrupt */
 131                     if (s->ibe & mask) {
 132                         /* Any edge triggers the interrupt */
 133                         s->istate |= mask;
 134                     } else {
 135                         /* Edge is selected by IEV */
 136                         s->istate |= ~(s->data ^ s->iev) & mask;
 137                     }
 138                 }
 139             }
 140         }
 141     }
 142
 143     /* Level interrupt */
 144     s->istate |= ~(s->data ^ s->iev) & s->isense;
 145
 146     DPRINTF("istate = %02X\n", s->istate);
 147
 148     qemu_set_irq(s->irq, (s->istate & s->im) != 0);
 149 }
 150
 151 static uint64_t pl061_read(void *opaque, hwaddr offset,
 152                            unsigned size)
 153 {
 154     PL061State *s = (PL061State *)opaque;
 155
 156     if (offset >= 0xfd0 && offset < 0x1000) {
 157         return s->id[(offset - 0xfd0) >> 2];
 158     }
 159     if (offset < 0x400) {
 160         return s->data & (offset >> 2);
 161     }
 162     switch (offset) {
 163     case 0x400: /* Direction */
 164         return s->dir;
 165     case 0x404: /* Interrupt sense */
 166         return s->isense;
 167     case 0x408: /* Interrupt both edges */
 168         return s->ibe;
 169     case 0x40c: /* Interrupt event */
 170         return s->iev;
 171     case 0x410: /* Interrupt mask */
 172         return s->im;
 173     case 0x414: /* Raw interrupt status */
 174         return s->istate;
 175     case 0x418: /* Masked interrupt status */
 176         return s->istate | s->im;
 177     case 0x420: /* Alternate function select */
 178         return s->afsel;
 179     case 0x500: /* 2mA drive */
 180         return s->dr2r;
 181     case 0x504: /* 4mA drive */
 182         return s->dr4r;
 183     case 0x508: /* 8mA drive */
 184         return s->dr8r;
 185     case 0x50c: /* Open drain */
 186         return s->odr;
 187     case 0x510: /* Pull-up */
 188         return s->pur;
 189     case 0x514: /* Pull-down */
 190         return s->pdr;
 191     case 0x518: /* Slew rate control */
 192         return s->slr;
 193     case 0x51c: /* Digital enable */
 194         return s->den;
 195     case 0x520: /* Lock */
 196         return s->locked;
 197     case 0x524: /* Commit */
 198         return s->cr;
 199     case 0x528: /* Analog mode select */
 200         return s->amsel;
 201     default:
 202         qemu_log_mask(LOG_GUEST_ERROR,
 203                       "pl061_read: Bad offset %x\n", (int)offset);
 204         return 0;
 205     }
 206 }
 207
 208 static void pl061_write(void *opaque, hwaddr offset,
 209                         uint64_t value, unsigned size)
 210 {
 211     PL061State *s = (PL061State *)opaque;
 212     uint8_t mask;
 213
 214     if (offset < 0x400) {
 215         mask = (offset >> 2) & s->dir;
 216         s->data = (s->data & ~mask) | (value & mask);
 217         pl061_update(s);
 218         return;
 219     }
 220     switch (offset) {
 221     case 0x400: /* Direction */
 222         s->dir = value & 0xff;
 223         break;
 224     case 0x404: /* Interrupt sense */
 225         s->isense = value & 0xff;
 226         break;
 227     case 0x408: /* Interrupt both edges */
 228         s->ibe = value & 0xff;
 229         break;
 230     case 0x40c: /* Interrupt event */
 231         s->iev = value & 0xff;
 232         break;
 233     case 0x410: /* Interrupt mask */
 234         s->im = value & 0xff;
 235         break;
 236     case 0x41c: /* Interrupt clear */
 237         s->istate &= ~value;
 238         break;
 239     case 0x420: /* Alternate function select */
 240         mask = s->cr;
 241         s->afsel = (s->afsel & ~mask) | (value & mask);
 242         break;
 243     case 0x500: /* 2mA drive */
 244         s->dr2r = value & 0xff;
 245         break;
 246     case 0x504: /* 4mA drive */
 247         s->dr4r = value & 0xff;
 248         break;
 249     case 0x508: /* 8mA drive */
 250         s->dr8r = value & 0xff;
 251         break;
 252     case 0x50c: /* Open drain */
 253         s->odr = value & 0xff;
 254         break;
 255     case 0x510: /* Pull-up */
 256         s->pur = value & 0xff;
 257         break;
 258     case 0x514: /* Pull-down */
 259         s->pdr = value & 0xff;
 260         break;
 261     case 0x518: /* Slew rate control */
 262         s->slr = value & 0xff;
 263         break;
 264     case 0x51c: /* Digital enable */
 265         s->den = value & 0xff;
 266         break;
 267     case 0x520: /* Lock */
 268         s->locked = (value != 0xacce551);
 269         break;
 270     case 0x524: /* Commit */
 271         if (!s->locked)
 272             s->cr = value & 0xff;
 273         break;
 274     case 0x528:
 275         s->amsel = value & 0xff;
 276         break;
 277     default:
 278         qemu_log_mask(LOG_GUEST_ERROR,
 279                       "pl061_write: Bad offset %x\n", (int)offset);
 280     }
 281     pl061_update(s);
 282 }
 283
 284 static void pl061_reset(PL061State *s)
 285 {
 286   s->locked = 1;
 287   s->cr = 0xff;
 288 }
 289
 290 static void pl061_set_irq(void * opaque, int irq, int level)
 291 {
 292     PL061State *s = (PL061State *)opaque;
 293     uint8_t mask;
 294
 295     mask = 1 << irq;
 296     if ((s->dir & mask) == 0) {
 297         s->data &= ~mask;
 298         if (level)
 299             s->data |= mask;
 300         pl061_update(s);
 301     }
 302 }
 303
 304 static const MemoryRegionOps pl061_ops = {
 305     .read = pl061_read,
 306     .write = pl061_write,
 307     .endianness = DEVICE_NATIVE_ENDIAN,
 308 };
 309
 310 static int pl061_initfn(SysBusDevice *sbd)
 311 {
 312     DeviceState *dev = DEVICE(sbd);
 313     PL061State *s = PL061(dev);
 314
 315     memory_region_init_io(&s->iomem, OBJECT(s), &pl061_ops, s, "pl061", 0x1000);
 316     sysbus_init_mmio(sbd, &s->iomem);
 317     sysbus_init_irq(sbd, &s->irq);
 318     qdev_init_gpio_in(dev, pl061_set_irq, 8);
 319     qdev_init_gpio_out(dev, s->out, 8);
 320     pl061_reset(s);
 321     return 0;
 322 }
 323
 324 static void pl061_luminary_init(Object *obj)
 325 {
 326     PL061State *s = PL061(obj);
 327
 328     s->id = pl061_id_luminary;
 329 }
 330
 331 static void pl061_init(Object *obj)
 332 {
 333     PL061State *s = PL061(obj);
 334
 335     s->id = pl061_id;
 336 }
 337
 338 static void pl061_class_init(ObjectClass *klass, void *data)
 339 {
 340     DeviceClass *dc = DEVICE_CLASS(klass);
 341     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 342
 343     k->init = pl061_initfn;
 344     dc->vmsd = &vmstate_pl061;
 345 }
 346
 347 static const TypeInfo pl061_info = {
 348     .name          = TYPE_PL061,
 349     .parent        = TYPE_SYS_BUS_DEVICE,
 350     .instance_size = sizeof(PL061State),
 351     .instance_init = pl061_init,
 352     .class_init    = pl061_class_init,
 353 };
 354
 355 static const TypeInfo pl061_luminary_info = {
 356     .name          = "pl061_luminary",
 357     .parent        = TYPE_PL061,
 358     .instance_init = pl061_luminary_init,
 359 };
 360
 361 static void pl061_register_types(void)
 362 {
 363     type_register_static(&pl061_info);
 364     type_register_static(&pl061_luminary_info);
 365 }
 366
 367 type_init(pl061_register_types)