hw/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 licenced under the GPL.
   9  */
  10
  11 #include "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 typedef struct {
  32     SysBusDevice busdev;
  33     int locked;
  34     uint8_t data;
  35     uint8_t old_data;
  36     uint8_t dir;
  37     uint8_t isense;
  38     uint8_t ibe;
  39     uint8_t iev;
  40     uint8_t im;
  41     uint8_t istate;
  42     uint8_t afsel;
  43     uint8_t dr2r;
  44     uint8_t dr4r;
  45     uint8_t dr8r;
  46     uint8_t odr;
  47     uint8_t pur;
  48     uint8_t pdr;
  49     uint8_t slr;
  50     uint8_t den;
  51     uint8_t cr;
  52     uint8_t float_high;
  53     qemu_irq irq;
  54     qemu_irq out[8];
  55     const unsigned char *id;
  56 } pl061_state;
  57
  58 static void pl061_update(pl061_state *s)
  59 {
  60     uint8_t changed;
  61     uint8_t mask;
  62     uint8_t out;
  63     int i;
  64
  65     /* Outputs float high.  */
  66     /* FIXME: This is board dependent.  */
  67     out = (s->data & s->dir) | ~s->dir;
  68     changed = s->old_data ^ out;
  69     if (!changed)
  70         return;
  71
  72     s->old_data = out;
  73     for (i = 0; i < 8; i++) {
  74         mask = 1 << i;
  75         if ((changed & mask) && s->out) {
  76             DPRINTF("Set output %d = %d\n", i, (out & mask) != 0);
  77             qemu_set_irq(s->out[i], (out & mask) != 0);
  78         }
  79     }
  80
  81     /* FIXME: Implement input interrupts.  */
  82 }
  83
  84 static uint32_t pl061_read(void *opaque, target_phys_addr_t offset)
  85 {
  86     pl061_state *s = (pl061_state *)opaque;
  87
  88     if (offset >= 0xfd0 && offset < 0x1000) {
  89         return s->id[(offset - 0xfd0) >> 2];
  90     }
  91     if (offset < 0x400) {
  92         return s->data & (offset >> 2);
  93     }
  94     switch (offset) {
  95     case 0x400: /* Direction */
  96         return s->dir;
  97     case 0x404: /* Interrupt sense */
  98         return s->isense;
  99     case 0x408: /* Interrupt both edges */
 100         return s->ibe;
 101     case 0x40c: /* Interrupt event */
 102         return s->iev;
 103     case 0x410: /* Interrupt mask */
 104         return s->im;
 105     case 0x414: /* Raw interrupt status */
 106         return s->istate;
 107     case 0x418: /* Masked interrupt status */
 108         return s->istate | s->im;
 109     case 0x420: /* Alternate function select */
 110         return s->afsel;
 111     case 0x500: /* 2mA drive */
 112         return s->dr2r;
 113     case 0x504: /* 4mA drive */
 114         return s->dr4r;
 115     case 0x508: /* 8mA drive */
 116         return s->dr8r;
 117     case 0x50c: /* Open drain */
 118         return s->odr;
 119     case 0x510: /* Pull-up */
 120         return s->pur;
 121     case 0x514: /* Pull-down */
 122         return s->pdr;
 123     case 0x518: /* Slew rate control */
 124         return s->slr;
 125     case 0x51c: /* Digital enable */
 126         return s->den;
 127     case 0x520: /* Lock */
 128         return s->locked;
 129     case 0x524: /* Commit */
 130         return s->cr;
 131     default:
 132         hw_error("pl061_read: Bad offset %x\n", (int)offset);
 133         return 0;
 134     }
 135 }
 136
 137 static void pl061_write(void *opaque, target_phys_addr_t offset,
 138                         uint32_t value)
 139 {
 140     pl061_state *s = (pl061_state *)opaque;
 141     uint8_t mask;
 142
 143     if (offset < 0x400) {
 144         mask = (offset >> 2) & s->dir;
 145         s->data = (s->data & ~mask) | (value & mask);
 146         pl061_update(s);
 147         return;
 148     }
 149     switch (offset) {
 150     case 0x400: /* Direction */
 151         s->dir = value;
 152         break;
 153     case 0x404: /* Interrupt sense */
 154         s->isense = value;
 155         break;
 156     case 0x408: /* Interrupt both edges */
 157         s->ibe = value;
 158         break;
 159     case 0x40c: /* Interrupt event */
 160         s->iev = value;
 161         break;
 162     case 0x410: /* Interrupt mask */
 163         s->im = value;
 164         break;
 165     case 0x41c: /* Interrupt clear */
 166         s->istate &= ~value;
 167         break;
 168     case 0x420: /* Alternate function select */
 169         mask = s->cr;
 170         s->afsel = (s->afsel & ~mask) | (value & mask);
 171         break;
 172     case 0x500: /* 2mA drive */
 173         s->dr2r = value;
 174         break;
 175     case 0x504: /* 4mA drive */
 176         s->dr4r = value;
 177         break;
 178     case 0x508: /* 8mA drive */
 179         s->dr8r = value;
 180         break;
 181     case 0x50c: /* Open drain */
 182         s->odr = value;
 183         break;
 184     case 0x510: /* Pull-up */
 185         s->pur = value;
 186         break;
 187     case 0x514: /* Pull-down */
 188         s->pdr = value;
 189         break;
 190     case 0x518: /* Slew rate control */
 191         s->slr = value;
 192         break;
 193     case 0x51c: /* Digital enable */
 194         s->den = value;
 195         break;
 196     case 0x520: /* Lock */
 197         s->locked = (value != 0xacce551);
 198         break;
 199     case 0x524: /* Commit */
 200         if (!s->locked)
 201             s->cr = value;
 202         break;
 203     default:
 204         hw_error("pl061_write: Bad offset %x\n", (int)offset);
 205     }
 206     pl061_update(s);
 207 }
 208
 209 static void pl061_reset(pl061_state *s)
 210 {
 211   s->locked = 1;
 212   s->cr = 0xff;
 213 }
 214
 215 static void pl061_set_irq(void * opaque, int irq, int level)
 216 {
 217     pl061_state *s = (pl061_state *)opaque;
 218     uint8_t mask;
 219
 220     mask = 1 << irq;
 221     if ((s->dir & mask) == 0) {
 222         s->data &= ~mask;
 223         if (level)
 224             s->data |= mask;
 225         pl061_update(s);
 226     }
 227 }
 228
 229 static CPUReadMemoryFunc * const pl061_readfn[] = {
 230    pl061_read,
 231    pl061_read,
 232    pl061_read
 233 };
 234
 235 static CPUWriteMemoryFunc * const pl061_writefn[] = {
 236    pl061_write,
 237    pl061_write,
 238    pl061_write
 239 };
 240
 241 static void pl061_save(QEMUFile *f, void *opaque)
 242 {
 243     pl061_state *s = (pl061_state *)opaque;
 244
 245     qemu_put_be32(f, s->locked);
 246     qemu_put_be32(f, s->data);
 247     qemu_put_be32(f, s->old_data);
 248     qemu_put_be32(f, s->dir);
 249     qemu_put_be32(f, s->isense);
 250     qemu_put_be32(f, s->ibe);
 251     qemu_put_be32(f, s->iev);
 252     qemu_put_be32(f, s->im);
 253     qemu_put_be32(f, s->istate);
 254     qemu_put_be32(f, s->afsel);
 255     qemu_put_be32(f, s->dr2r);
 256     qemu_put_be32(f, s->dr4r);
 257     qemu_put_be32(f, s->dr8r);
 258     qemu_put_be32(f, s->odr);
 259     qemu_put_be32(f, s->pur);
 260     qemu_put_be32(f, s->pdr);
 261     qemu_put_be32(f, s->slr);
 262     qemu_put_be32(f, s->den);
 263     qemu_put_be32(f, s->cr);
 264     qemu_put_be32(f, s->float_high);
 265 }
 266
 267 static int pl061_load(QEMUFile *f, void *opaque, int version_id)
 268 {
 269     pl061_state *s = (pl061_state *)opaque;
 270     if (version_id != 1)
 271         return -EINVAL;
 272
 273     s->locked = qemu_get_be32(f);
 274     s->data = qemu_get_be32(f);
 275     s->old_data = qemu_get_be32(f);
 276     s->dir = qemu_get_be32(f);
 277     s->isense = qemu_get_be32(f);
 278     s->ibe = qemu_get_be32(f);
 279     s->iev = qemu_get_be32(f);
 280     s->im = qemu_get_be32(f);
 281     s->istate = qemu_get_be32(f);
 282     s->afsel = qemu_get_be32(f);
 283     s->dr2r = qemu_get_be32(f);
 284     s->dr4r = qemu_get_be32(f);
 285     s->dr8r = qemu_get_be32(f);
 286     s->odr = qemu_get_be32(f);
 287     s->pur = qemu_get_be32(f);
 288     s->pdr = qemu_get_be32(f);
 289     s->slr = qemu_get_be32(f);
 290     s->den = qemu_get_be32(f);
 291     s->cr = qemu_get_be32(f);
 292     s->float_high = qemu_get_be32(f);
 293
 294     return 0;
 295 }
 296
 297 static int pl061_init(SysBusDevice *dev, const unsigned char *id)
 298 {
 299     int iomemtype;
 300     pl061_state *s = FROM_SYSBUS(pl061_state, dev);
 301     s->id = id;
 302     iomemtype = cpu_register_io_memory(pl061_readfn,
 303                                        pl061_writefn, s,
 304                                        DEVICE_NATIVE_ENDIAN);
 305     sysbus_init_mmio(dev, 0x1000, iomemtype);
 306     sysbus_init_irq(dev, &s->irq);
 307     qdev_init_gpio_in(&dev->qdev, pl061_set_irq, 8);
 308     qdev_init_gpio_out(&dev->qdev, s->out, 8);
 309     pl061_reset(s);
 310     register_savevm(&dev->qdev, "pl061_gpio", -1, 1, pl061_save, pl061_load, s);
 311     return 0;
 312 }
 313
 314 static int pl061_init_luminary(SysBusDevice *dev)
 315 {
 316     return pl061_init(dev, pl061_id_luminary);
 317 }
 318
 319 static int pl061_init_arm(SysBusDevice *dev)
 320 {
 321     return pl061_init(dev, pl061_id);
 322 }
 323
 324 static void pl061_register_devices(void)
 325 {
 326     sysbus_register_dev("pl061", sizeof(pl061_state),
 327                         pl061_init_arm);
 328     sysbus_register_dev("pl061_luminary", sizeof(pl061_state),
 329                         pl061_init_luminary);
 330 }
 331
 332 device_init(pl061_register_devices)