hw/pxa2xx_gpio.c

   1 /*
   2  * Intel XScale PXA255/270 GPIO controller emulation.
   3  *
   4  * Copyright (c) 2006 Openedhand Ltd.
   5  * Written by Andrzej Zaborowski <balrog@zabor.org>
   6  *
   7  * This code is licensed under the GPL.
   8  */
   9
  10 #include "hw.h"
  11 #include "pxa.h"
  12
  13 #define PXA2XX_GPIO_BANKS       4
  14
  15 struct pxa2xx_gpio_info_s {
  16     target_phys_addr_t base;
  17     qemu_irq *pic;
  18     int lines;
  19     CPUState *cpu_env;
  20     qemu_irq *in;
  21
  22     /* XXX: GNU C vectors are more suitable */
  23     uint32_t ilevel[PXA2XX_GPIO_BANKS];
  24     uint32_t olevel[PXA2XX_GPIO_BANKS];
  25     uint32_t dir[PXA2XX_GPIO_BANKS];
  26     uint32_t rising[PXA2XX_GPIO_BANKS];
  27     uint32_t falling[PXA2XX_GPIO_BANKS];
  28     uint32_t status[PXA2XX_GPIO_BANKS];
  29     uint32_t gpsr[PXA2XX_GPIO_BANKS];
  30     uint32_t gafr[PXA2XX_GPIO_BANKS * 2];
  31
  32     uint32_t prev_level[PXA2XX_GPIO_BANKS];
  33     qemu_irq handler[PXA2XX_GPIO_BANKS * 32];
  34     qemu_irq read_notify;
  35 };
  36
  37 static struct {
  38     enum {
  39         GPIO_NONE,
  40         GPLR,
  41         GPSR,
  42         GPCR,
  43         GPDR,
  44         GRER,
  45         GFER,
  46         GEDR,
  47         GAFR_L,
  48         GAFR_U,
  49     } reg;
  50     int bank;
  51 } pxa2xx_gpio_regs[0x200] = {
  52     [0 ... 0x1ff] = { GPIO_NONE, 0 },
  53 #define PXA2XX_REG(reg, a0, a1, a2, a3) \
  54     [a0] = { reg, 0 }, [a1] = { reg, 1 }, [a2] = { reg, 2 }, [a3] = { reg, 3 },
  55
  56     PXA2XX_REG(GPLR, 0x000, 0x004, 0x008, 0x100)
  57     PXA2XX_REG(GPSR, 0x018, 0x01c, 0x020, 0x118)
  58     PXA2XX_REG(GPCR, 0x024, 0x028, 0x02c, 0x124)
  59     PXA2XX_REG(GPDR, 0x00c, 0x010, 0x014, 0x10c)
  60     PXA2XX_REG(GRER, 0x030, 0x034, 0x038, 0x130)
  61     PXA2XX_REG(GFER, 0x03c, 0x040, 0x044, 0x13c)
  62     PXA2XX_REG(GEDR, 0x048, 0x04c, 0x050, 0x148)
  63     PXA2XX_REG(GAFR_L, 0x054, 0x05c, 0x064, 0x06c)
  64     PXA2XX_REG(GAFR_U, 0x058, 0x060, 0x068, 0x070)
  65 };
  66
  67 static void pxa2xx_gpio_irq_update(struct pxa2xx_gpio_info_s *s)
  68 {
  69     if (s->status[0] & (1 << 0))
  70         qemu_irq_raise(s->pic[PXA2XX_PIC_GPIO_0]);
  71     else
  72         qemu_irq_lower(s->pic[PXA2XX_PIC_GPIO_0]);
  73
  74     if (s->status[0] & (1 << 1))
  75         qemu_irq_raise(s->pic[PXA2XX_PIC_GPIO_1]);
  76     else
  77         qemu_irq_lower(s->pic[PXA2XX_PIC_GPIO_1]);
  78
  79     if ((s->status[0] & ~3) | s->status[1] | s->status[2] | s->status[3])
  80         qemu_irq_raise(s->pic[PXA2XX_PIC_GPIO_X]);
  81     else
  82         qemu_irq_lower(s->pic[PXA2XX_PIC_GPIO_X]);
  83 }
  84
  85 /* Bitmap of pins used as standby and sleep wake-up sources.  */
  86 static const int pxa2xx_gpio_wake[PXA2XX_GPIO_BANKS] = {
  87     0x8003fe1b, 0x002001fc, 0xec080000, 0x0012007f,
  88 };
  89
  90 static void pxa2xx_gpio_set(void *opaque, int line, int level)
  91 {
  92     struct pxa2xx_gpio_info_s *s = (struct pxa2xx_gpio_info_s *) opaque;
  93     int bank;
  94     uint32_t mask;
  95
  96     if (line >= s->lines) {
  97         printf("%s: No GPIO pin %i\n", __FUNCTION__, line);
  98         return;
  99     }
 100
 101     bank = line >> 5;
 102     mask = 1 << (line & 31);
 103
 104     if (level) {
 105         s->status[bank] |= s->rising[bank] & mask &
 106                 ~s->ilevel[bank] & ~s->dir[bank];
 107         s->ilevel[bank] |= mask;
 108     } else {
 109         s->status[bank] |= s->falling[bank] & mask &
 110                 s->ilevel[bank] & ~s->dir[bank];
 111         s->ilevel[bank] &= ~mask;
 112     }
 113
 114     if (s->status[bank] & mask)
 115         pxa2xx_gpio_irq_update(s);
 116
 117     /* Wake-up GPIOs */
 118     if (s->cpu_env->halted && (mask & ~s->dir[bank] & pxa2xx_gpio_wake[bank]))
 119         cpu_interrupt(s->cpu_env, CPU_INTERRUPT_EXITTB);
 120 }
 121
 122 static void pxa2xx_gpio_handler_update(struct pxa2xx_gpio_info_s *s) {
 123     uint32_t level, diff;
 124     int i, bit, line;
 125     for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
 126         level = s->olevel[i] & s->dir[i];
 127
 128         for (diff = s->prev_level[i] ^ level; diff; diff ^= 1 << bit) {
 129             bit = ffs(diff) - 1;
 130             line = bit + 32 * i;
 131             qemu_set_irq(s->handler[line], (level >> bit) & 1);
 132         }
 133
 134         s->prev_level[i] = level;
 135     }
 136 }
 137
 138 static uint32_t pxa2xx_gpio_read(void *opaque, target_phys_addr_t offset)
 139 {
 140     struct pxa2xx_gpio_info_s *s = (struct pxa2xx_gpio_info_s *) opaque;
 141     uint32_t ret;
 142     int bank;
 143     offset -= s->base;
 144     if (offset >= 0x200)
 145         return 0;
 146
 147     bank = pxa2xx_gpio_regs[offset].bank;
 148     switch (pxa2xx_gpio_regs[offset].reg) {
 149     case GPDR:          /* GPIO Pin-Direction registers */
 150         return s->dir[bank];
 151
 152     case GPSR:          /* GPIO Pin-Output Set registers */
 153         printf("%s: Read from a write-only register " REG_FMT "\n",
 154                         __FUNCTION__, offset);
 155         return s->gpsr[bank];   /* Return last written value.  */
 156
 157     case GPCR:          /* GPIO Pin-Output Clear registers */
 158         printf("%s: Read from a write-only register " REG_FMT "\n",
 159                         __FUNCTION__, offset);
 160         return 31337;           /* Specified as unpredictable in the docs.  */
 161
 162     case GRER:          /* GPIO Rising-Edge Detect Enable registers */
 163         return s->rising[bank];
 164
 165     case GFER:          /* GPIO Falling-Edge Detect Enable registers */
 166         return s->falling[bank];
 167
 168     case GAFR_L:        /* GPIO Alternate Function registers */
 169         return s->gafr[bank * 2];
 170
 171     case GAFR_U:        /* GPIO Alternate Function registers */
 172         return s->gafr[bank * 2 + 1];
 173
 174     case GPLR:          /* GPIO Pin-Level registers */
 175         ret = (s->olevel[bank] & s->dir[bank]) |
 176                 (s->ilevel[bank] & ~s->dir[bank]);
 177         qemu_irq_raise(s->read_notify);
 178         return ret;
 179
 180     case GEDR:          /* GPIO Edge Detect Status registers */
 181         return s->status[bank];
 182
 183     default:
 184         cpu_abort(cpu_single_env,
 185                 "%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
 186     }
 187
 188     return 0;
 189 }
 190
 191 static void pxa2xx_gpio_write(void *opaque,
 192                 target_phys_addr_t offset, uint32_t value)
 193 {
 194     struct pxa2xx_gpio_info_s *s = (struct pxa2xx_gpio_info_s *) opaque;
 195     int bank;
 196     offset -= s->base;
 197     if (offset >= 0x200)
 198         return;
 199
 200     bank = pxa2xx_gpio_regs[offset].bank;
 201     switch (pxa2xx_gpio_regs[offset].reg) {
 202     case GPDR:          /* GPIO Pin-Direction registers */
 203         s->dir[bank] = value;
 204         pxa2xx_gpio_handler_update(s);
 205         break;
 206
 207     case GPSR:          /* GPIO Pin-Output Set registers */
 208         s->olevel[bank] |= value;
 209         pxa2xx_gpio_handler_update(s);
 210         s->gpsr[bank] = value;
 211         break;
 212
 213     case GPCR:          /* GPIO Pin-Output Clear registers */
 214         s->olevel[bank] &= ~value;
 215         pxa2xx_gpio_handler_update(s);
 216         break;
 217
 218     case GRER:          /* GPIO Rising-Edge Detect Enable registers */
 219         s->rising[bank] = value;
 220         break;
 221
 222     case GFER:          /* GPIO Falling-Edge Detect Enable registers */
 223         s->falling[bank] = value;
 224         break;
 225
 226     case GAFR_L:        /* GPIO Alternate Function registers */
 227         s->gafr[bank * 2] = value;
 228         break;
 229
 230     case GAFR_U:        /* GPIO Alternate Function registers */
 231         s->gafr[bank * 2 + 1] = value;
 232         break;
 233
 234     case GEDR:          /* GPIO Edge Detect Status registers */
 235         s->status[bank] &= ~value;
 236         pxa2xx_gpio_irq_update(s);
 237         break;
 238
 239     default:
 240         cpu_abort(cpu_single_env,
 241                 "%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
 242     }
 243 }
 244
 245 static CPUReadMemoryFunc *pxa2xx_gpio_readfn[] = {
 246     pxa2xx_gpio_read,
 247     pxa2xx_gpio_read,
 248     pxa2xx_gpio_read
 249 };
 250
 251 static CPUWriteMemoryFunc *pxa2xx_gpio_writefn[] = {
 252     pxa2xx_gpio_write,
 253     pxa2xx_gpio_write,
 254     pxa2xx_gpio_write
 255 };
 256
 257 static void pxa2xx_gpio_save(QEMUFile *f, void *opaque)
 258 {
 259     struct pxa2xx_gpio_info_s *s = (struct pxa2xx_gpio_info_s *) opaque;
 260     int i;
 261
 262     qemu_put_be32(f, s->lines);
 263
 264     for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
 265         qemu_put_be32s(f, &s->ilevel[i]);
 266         qemu_put_be32s(f, &s->olevel[i]);
 267         qemu_put_be32s(f, &s->dir[i]);
 268         qemu_put_be32s(f, &s->rising[i]);
 269         qemu_put_be32s(f, &s->falling[i]);
 270         qemu_put_be32s(f, &s->status[i]);
 271         qemu_put_be32s(f, &s->gafr[i * 2 + 0]);
 272         qemu_put_be32s(f, &s->gafr[i * 2 + 1]);
 273
 274         qemu_put_be32s(f, &s->prev_level[i]);
 275     }
 276 }
 277
 278 static int pxa2xx_gpio_load(QEMUFile *f, void *opaque, int version_id)
 279 {
 280     struct pxa2xx_gpio_info_s *s = (struct pxa2xx_gpio_info_s *) opaque;
 281     int i;
 282
 283     if (qemu_get_be32(f) != s->lines)
 284         return -EINVAL;
 285
 286     for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
 287         qemu_get_be32s(f, &s->ilevel[i]);
 288         qemu_get_be32s(f, &s->olevel[i]);
 289         qemu_get_be32s(f, &s->dir[i]);
 290         qemu_get_be32s(f, &s->rising[i]);
 291         qemu_get_be32s(f, &s->falling[i]);
 292         qemu_get_be32s(f, &s->status[i]);
 293         qemu_get_be32s(f, &s->gafr[i * 2 + 0]);
 294         qemu_get_be32s(f, &s->gafr[i * 2 + 1]);
 295
 296         qemu_get_be32s(f, &s->prev_level[i]);
 297     }
 298
 299     return 0;
 300 }
 301
 302 struct pxa2xx_gpio_info_s *pxa2xx_gpio_init(target_phys_addr_t base,
 303                 CPUState *env, qemu_irq *pic, int lines)
 304 {
 305     int iomemtype;
 306     struct pxa2xx_gpio_info_s *s;
 307
 308     s = (struct pxa2xx_gpio_info_s *)
 309             qemu_mallocz(sizeof(struct pxa2xx_gpio_info_s));
 310     memset(s, 0, sizeof(struct pxa2xx_gpio_info_s));
 311     s->base = base;
 312     s->pic = pic;
 313     s->lines = lines;
 314     s->cpu_env = env;
 315     s->in = qemu_allocate_irqs(pxa2xx_gpio_set, s, lines);
 316
 317     iomemtype = cpu_register_io_memory(0, pxa2xx_gpio_readfn,
 318                     pxa2xx_gpio_writefn, s);
 319     cpu_register_physical_memory(base, 0x00001000, iomemtype);
 320
 321     register_savevm("pxa2xx_gpio", 0, 0,
 322                     pxa2xx_gpio_save, pxa2xx_gpio_load, s);
 323
 324     return s;
 325 }
 326
 327 qemu_irq *pxa2xx_gpio_in_get(struct pxa2xx_gpio_info_s *s)
 328 {
 329     return s->in;
 330 }
 331
 332 void pxa2xx_gpio_out_set(struct pxa2xx_gpio_info_s *s,
 333                 int line, qemu_irq handler)
 334 {
 335     if (line >= s->lines) {
 336         printf("%s: No GPIO pin %i\n", __FUNCTION__, line);
 337         return;
 338     }
 339
 340     s->handler[line] = handler;
 341 }
 342
 343 /*
 344  * Registers a callback to notify on GPLR reads.  This normally
 345  * shouldn't be needed but it is used for the hack on Spitz machines.
 346  */
 347 void pxa2xx_gpio_read_notifier(struct pxa2xx_gpio_info_s *s, qemu_irq handler)
 348 {
 349     s->read_notify = handler;
 350 }