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 "hw.h"
  12 #include "primecell.h"
  13
  14 //#define DEBUG_PL061 1
  15
  16 #ifdef DEBUG_PL061
  17 #define DPRINTF(fmt, args...) \
  18 do { printf("pl061: " fmt , ##args); } while (0)
  19 #define BADF(fmt, args...) \
  20 do { fprintf(stderr, "pl061: error: " fmt , ##args); exit(1);} while (0)
  21 #else
  22 #define DPRINTF(fmt, args...) do {} while(0)
  23 #define BADF(fmt, args...) \
  24 do { fprintf(stderr, "pl061: error: " fmt , ##args);} while (0)
  25 #endif
  26
  27 static const uint8_t pl061_id[12] =
  28   { 0x00, 0x00, 0x00, 0x00, 0x61, 0x00, 0x18, 0x01, 0x0d, 0xf0, 0x05, 0xb1 };
  29
  30 typedef struct {
  31     int locked;
  32     uint8_t data;
  33     uint8_t old_data;
  34     uint8_t dir;
  35     uint8_t isense;
  36     uint8_t ibe;
  37     uint8_t iev;
  38     uint8_t im;
  39     uint8_t istate;
  40     uint8_t afsel;
  41     uint8_t dr2r;
  42     uint8_t dr4r;
  43     uint8_t dr8r;
  44     uint8_t odr;
  45     uint8_t pur;
  46     uint8_t pdr;
  47     uint8_t slr;
  48     uint8_t den;
  49     uint8_t cr;
  50     uint8_t float_high;
  51     qemu_irq irq;
  52     qemu_irq out[8];
  53 } pl061_state;
  54
  55 static void pl061_update(pl061_state *s)
  56 {
  57     uint8_t changed;
  58     uint8_t mask;
  59     uint8_t out;
  60     int i;
  61
  62     /* Outputs float high.  */
  63     /* FIXME: This is board dependent.  */
  64     out = (s->data & s->dir) | ~s->dir;
  65     changed = s->old_data ^ out;
  66     if (!changed)
  67         return;
  68
  69     s->old_data = out;
  70     for (i = 0; i < 8; i++) {
  71         mask = 1 << i;
  72         if ((changed & mask) && s->out) {
  73             DPRINTF("Set output %d = %d\n", i, (out & mask) != 0);
  74             qemu_set_irq(s->out[i], (out & mask) != 0);
  75         }
  76     }
  77
  78     /* FIXME: Implement input interrupts.  */
  79 }
  80
  81 static uint32_t pl061_read(void *opaque, target_phys_addr_t offset)
  82 {
  83     pl061_state *s = (pl061_state *)opaque;
  84
  85     if (offset >= 0xfd0 && offset < 0x1000) {
  86         return pl061_id[(offset - 0xfd0) >> 2];
  87     }
  88     if (offset < 0x400) {
  89         return s->data & (offset >> 2);
  90     }
  91     switch (offset) {
  92     case 0x400: /* Direction */
  93         return s->dir;
  94     case 0x404: /* Interrupt sense */
  95         return s->isense;
  96     case 0x408: /* Interrupt both edges */
  97         return s->ibe;
  98     case 0x40c: /* Interupt event */
  99         return s->iev;
 100     case 0x410: /* Interrupt mask */
 101         return s->im;
 102     case 0x414: /* Raw interrupt status */
 103         return s->istate;
 104     case 0x418: /* Masked interrupt status */
 105         return s->istate | s->im;
 106     case 0x420: /* Alternate function select */
 107         return s->afsel;
 108     case 0x500: /* 2mA drive */
 109         return s->dr2r;
 110     case 0x504: /* 4mA drive */
 111         return s->dr4r;
 112     case 0x508: /* 8mA drive */
 113         return s->dr8r;
 114     case 0x50c: /* Open drain */
 115         return s->odr;
 116     case 0x510: /* Pull-up */
 117         return s->pur;
 118     case 0x514: /* Pull-down */
 119         return s->pdr;
 120     case 0x518: /* Slew rate control */
 121         return s->slr;
 122     case 0x51c: /* Digital enable */
 123         return s->den;
 124     case 0x520: /* Lock */
 125         return s->locked;
 126     case 0x524: /* Commit */
 127         return s->cr;
 128     default:
 129         cpu_abort (cpu_single_env, "pl061_read: Bad offset %x\n",
 130                    (int)offset);
 131         return 0;
 132     }
 133 }
 134
 135 static void pl061_write(void *opaque, target_phys_addr_t offset,
 136                         uint32_t value)
 137 {
 138     pl061_state *s = (pl061_state *)opaque;
 139     uint8_t mask;
 140
 141     if (offset < 0x400) {
 142         mask = (offset >> 2) & s->dir;
 143         s->data = (s->data & ~mask) | (value & mask);
 144         pl061_update(s);
 145         return;
 146     }
 147     switch (offset) {
 148     case 0x400: /* Direction */
 149         s->dir = value;
 150         break;
 151     case 0x404: /* Interrupt sense */
 152         s->isense = value;
 153         break;
 154     case 0x408: /* Interrupt both edges */
 155         s->ibe = value;
 156         break;
 157     case 0x40c: /* Interupt event */
 158         s->iev = value;
 159         break;
 160     case 0x410: /* Interrupt mask */
 161         s->im = value;
 162         break;
 163     case 0x41c: /* Interrupt clear */
 164         s->istate &= ~value;
 165         break;
 166     case 0x420: /* Alternate function select */
 167         mask = s->cr;
 168         s->afsel = (s->afsel & ~mask) | (value & mask);
 169         break;
 170     case 0x500: /* 2mA drive */
 171         s->dr2r = value;
 172         break;
 173     case 0x504: /* 4mA drive */
 174         s->dr4r = value;
 175         break;
 176     case 0x508: /* 8mA drive */
 177         s->dr8r = value;
 178         break;
 179     case 0x50c: /* Open drain */
 180         s->odr = value;
 181         break;
 182     case 0x510: /* Pull-up */
 183         s->pur = value;
 184         break;
 185     case 0x514: /* Pull-down */
 186         s->pdr = value;
 187         break;
 188     case 0x518: /* Slew rate control */
 189         s->slr = value;
 190         break;
 191     case 0x51c: /* Digital enable */
 192         s->den = value;
 193         break;
 194     case 0x520: /* Lock */
 195         s->locked = (value != 0xacce551);
 196         break;
 197     case 0x524: /* Commit */
 198         if (!s->locked)
 199             s->cr = value;
 200         break;
 201     default:
 202         cpu_abort (cpu_single_env, "pl061_write: Bad offset %x\n",
 203                    (int)offset);
 204     }
 205     pl061_update(s);
 206 }
 207
 208 static void pl061_reset(pl061_state *s)
 209 {
 210   s->locked = 1;
 211   s->cr = 0xff;
 212 }
 213
 214 static void pl061_set_irq(void * opaque, int irq, int level)
 215 {
 216     pl061_state *s = (pl061_state *)opaque;
 217     uint8_t mask;
 218
 219     mask = 1 << irq;
 220     if ((s->dir & mask) == 0) {
 221         s->data &= ~mask;
 222         if (level)
 223             s->data |= mask;
 224         pl061_update(s);
 225     }
 226 }
 227
 228 static CPUReadMemoryFunc *pl061_readfn[] = {
 229    pl061_read,
 230    pl061_read,
 231    pl061_read
 232 };
 233
 234 static CPUWriteMemoryFunc *pl061_writefn[] = {
 235    pl061_write,
 236    pl061_write,
 237    pl061_write
 238 };
 239
 240 static void pl061_save(QEMUFile *f, void *opaque)
 241 {
 242     pl061_state *s = (pl061_state *)opaque;
 243
 244     qemu_put_be32(f, s->locked);
 245     qemu_put_be32(f, s->data);
 246     qemu_put_be32(f, s->old_data);
 247     qemu_put_be32(f, s->dir);
 248     qemu_put_be32(f, s->isense);
 249     qemu_put_be32(f, s->ibe);
 250     qemu_put_be32(f, s->iev);
 251     qemu_put_be32(f, s->im);
 252     qemu_put_be32(f, s->istate);
 253     qemu_put_be32(f, s->afsel);
 254     qemu_put_be32(f, s->dr2r);
 255     qemu_put_be32(f, s->dr4r);
 256     qemu_put_be32(f, s->dr8r);
 257     qemu_put_be32(f, s->odr);
 258     qemu_put_be32(f, s->pur);
 259     qemu_put_be32(f, s->pdr);
 260     qemu_put_be32(f, s->slr);
 261     qemu_put_be32(f, s->den);
 262     qemu_put_be32(f, s->cr);
 263     qemu_put_be32(f, s->float_high);
 264 }
 265
 266 static int pl061_load(QEMUFile *f, void *opaque, int version_id)
 267 {
 268     pl061_state *s = (pl061_state *)opaque;
 269     if (version_id != 1)
 270         return -EINVAL;
 271
 272     s->locked = qemu_get_be32(f);
 273     s->data = qemu_get_be32(f);
 274     s->old_data = qemu_get_be32(f);
 275     s->dir = qemu_get_be32(f);
 276     s->isense = qemu_get_be32(f);
 277     s->ibe = qemu_get_be32(f);
 278     s->iev = qemu_get_be32(f);
 279     s->im = qemu_get_be32(f);
 280     s->istate = qemu_get_be32(f);
 281     s->afsel = qemu_get_be32(f);
 282     s->dr2r = qemu_get_be32(f);
 283     s->dr4r = qemu_get_be32(f);
 284     s->dr8r = qemu_get_be32(f);
 285     s->odr = qemu_get_be32(f);
 286     s->pur = qemu_get_be32(f);
 287     s->pdr = qemu_get_be32(f);
 288     s->slr = qemu_get_be32(f);
 289     s->den = qemu_get_be32(f);
 290     s->cr = qemu_get_be32(f);
 291     s->float_high = qemu_get_be32(f);
 292
 293     return 0;
 294 }
 295
 296 /* Returns an array of inputs.  */
 297 qemu_irq *pl061_init(uint32_t base, qemu_irq irq, qemu_irq **out)
 298 {
 299     int iomemtype;
 300     pl061_state *s;
 301
 302     s = (pl061_state *)qemu_mallocz(sizeof(pl061_state));
 303     iomemtype = cpu_register_io_memory(0, pl061_readfn,
 304                                        pl061_writefn, s);
 305     cpu_register_physical_memory(base, 0x00001000, iomemtype);
 306     s->irq = irq;
 307     pl061_reset(s);
 308     if (out)
 309         *out = s->out;
 310
 311     register_savevm("pl061_gpio", -1, 1, pl061_save, pl061_load, s);
 312     return qemu_allocate_irqs(pl061_set_irq, s, 8);
 313 }