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     uint32_t base;
  32     int locked;
  33     uint8_t data;
  34     uint8_t old_data;
  35     uint8_t dir;
  36     uint8_t isense;
  37     uint8_t ibe;
  38     uint8_t iev;
  39     uint8_t im;
  40     uint8_t istate;
  41     uint8_t afsel;
  42     uint8_t dr2r;
  43     uint8_t dr4r;
  44     uint8_t dr8r;
  45     uint8_t odr;
  46     uint8_t pur;
  47     uint8_t pdr;
  48     uint8_t slr;
  49     uint8_t den;
  50     uint8_t cr;
  51     uint8_t float_high;
  52     qemu_irq irq;
  53     qemu_irq out[8];
  54 } pl061_state;
  55
  56 static void pl061_update(pl061_state *s)
  57 {
  58     uint8_t changed;
  59     uint8_t mask;
  60     uint8_t out;
  61     int i;
  62
  63     /* Outputs float high.  */
  64     /* FIXME: This is board dependent.  */
  65     out = (s->data & s->dir) | ~s->dir;
  66     changed = s->old_data ^ out;
  67     if (!changed)
  68         return;
  69
  70     s->old_data = out;
  71     for (i = 0; i < 8; i++) {
  72         mask = 1 << i;
  73         if ((changed & mask) && s->out) {
  74             DPRINTF("Set output %d = %d\n", i, (out & mask) != 0);
  75             qemu_set_irq(s->out[i], (out & mask) != 0);
  76         }
  77     }
  78
  79     /* FIXME: Implement input interrupts.  */
  80 }
  81
  82 static uint32_t pl061_read(void *opaque, target_phys_addr_t offset)
  83 {
  84     pl061_state *s = (pl061_state *)opaque;
  85
  86     offset -= s->base;
  87     if (offset >= 0xfd0 && offset < 0x1000) {
  88         return pl061_id[(offset - 0xfd0) >> 2];
  89     }
  90     if (offset < 0x400) {
  91         return s->data & (offset >> 2);
  92     }
  93     switch (offset) {
  94     case 0x400: /* Direction */
  95         return s->dir;
  96     case 0x404: /* Interrupt sense */
  97         return s->isense;
  98     case 0x408: /* Interrupt both edges */
  99         return s->ibe;
 100     case 0x40c: /* Interupt event */
 101         return s->iev;
 102     case 0x410: /* Interrupt mask */
 103         return s->im;
 104     case 0x414: /* Raw interrupt status */
 105         return s->istate;
 106     case 0x418: /* Masked interrupt status */
 107         return s->istate | s->im;
 108     case 0x420: /* Alternate function select */
 109         return s->afsel;
 110     case 0x500: /* 2mA drive */
 111         return s->dr2r;
 112     case 0x504: /* 4mA drive */
 113         return s->dr4r;
 114     case 0x508: /* 8mA drive */
 115         return s->dr8r;
 116     case 0x50c: /* Open drain */
 117         return s->odr;
 118     case 0x510: /* Pull-up */
 119         return s->pur;
 120     case 0x514: /* Pull-down */
 121         return s->pdr;
 122     case 0x518: /* Slew rate control */
 123         return s->slr;
 124     case 0x51c: /* Digital enable */
 125         return s->den;
 126     case 0x520: /* Lock */
 127         return s->locked;
 128     case 0x524: /* Commit */
 129         return s->cr;
 130     default:
 131         cpu_abort (cpu_single_env, "pl061_read: Bad offset %x\n",
 132                    (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     offset -= s->base;
 144     if (offset < 0x400) {
 145         mask = (offset >> 2) & s->dir;
 146         s->data = (s->data & ~mask) | (value & mask);
 147         pl061_update(s);
 148         return;
 149     }
 150     switch (offset) {
 151     case 0x400: /* Direction */
 152         s->dir = value;
 153         break;
 154     case 0x404: /* Interrupt sense */
 155         s->isense = value;
 156         break;
 157     case 0x408: /* Interrupt both edges */
 158         s->ibe = value;
 159         break;
 160     case 0x40c: /* Interupt event */
 161         s->iev = value;
 162         break;
 163     case 0x410: /* Interrupt mask */
 164         s->im = value;
 165         break;
 166     case 0x41c: /* Interrupt clear */
 167         s->istate &= ~value;
 168         break;
 169     case 0x420: /* Alternate function select */
 170         mask = s->cr;
 171         s->afsel = (s->afsel & ~mask) | (value & mask);
 172         break;
 173     case 0x500: /* 2mA drive */
 174         s->dr2r = value;
 175         break;
 176     case 0x504: /* 4mA drive */
 177         s->dr4r = value;
 178         break;
 179     case 0x508: /* 8mA drive */
 180         s->dr8r = value;
 181         break;
 182     case 0x50c: /* Open drain */
 183         s->odr = value;
 184         break;
 185     case 0x510: /* Pull-up */
 186         s->pur = value;
 187         break;
 188     case 0x514: /* Pull-down */
 189         s->pdr = value;
 190         break;
 191     case 0x518: /* Slew rate control */
 192         s->slr = value;
 193         break;
 194     case 0x51c: /* Digital enable */
 195         s->den = value;
 196         break;
 197     case 0x520: /* Lock */
 198         s->locked = (value != 0xacce551);
 199         break;
 200     case 0x524: /* Commit */
 201         if (!s->locked)
 202             s->cr = value;
 203         break;
 204     default:
 205         cpu_abort (cpu_single_env, "pl061_write: Bad offset %x\n",
 206                    (int)offset);
 207     }
 208     pl061_update(s);
 209 }
 210
 211 static void pl061_reset(pl061_state *s)
 212 {
 213   s->locked = 1;
 214   s->cr = 0xff;
 215 }
 216
 217 static void pl061_set_irq(void * opaque, int irq, int level)
 218 {
 219     pl061_state *s = (pl061_state *)opaque;
 220     uint8_t mask;
 221
 222     mask = 1 << irq;
 223     if ((s->dir & mask) == 0) {
 224         s->data &= ~mask;
 225         if (level)
 226             s->data |= mask;
 227         pl061_update(s);
 228     }
 229 }
 230
 231 static CPUReadMemoryFunc *pl061_readfn[] = {
 232    pl061_read,
 233    pl061_read,
 234    pl061_read
 235 };
 236
 237 static CPUWriteMemoryFunc *pl061_writefn[] = {
 238    pl061_write,
 239    pl061_write,
 240    pl061_write
 241 };
 242
 243 /* Returns an array of inputs.  */
 244 qemu_irq *pl061_init(uint32_t base, qemu_irq irq, qemu_irq **out)
 245 {
 246     int iomemtype;
 247     pl061_state *s;
 248
 249     s = (pl061_state *)qemu_mallocz(sizeof(pl061_state));
 250     iomemtype = cpu_register_io_memory(0, pl061_readfn,
 251                                        pl061_writefn, s);
 252     cpu_register_physical_memory(base, 0x00001000, iomemtype);
 253     s->base = base;
 254     s->irq = irq;
 255     pl061_reset(s);
 256     if (out)
 257         *out = s->out;
 258
 259     /* ??? Save/restore.  */
 260     return qemu_allocate_irqs(pl061_set_irq, s, 8);
 261 }
 262