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 PXA2xxGPIOInfo {
  16     qemu_irq *pic;
  17     int lines;
  18     CPUState *cpu_env;
  19     qemu_irq *in;
  20
  21     /* XXX: GNU C vectors are more suitable */
  22     uint32_t ilevel[PXA2XX_GPIO_BANKS];
  23     uint32_t olevel[PXA2XX_GPIO_BANKS];
  24     uint32_t dir[PXA2XX_GPIO_BANKS];
  25     uint32_t rising[PXA2XX_GPIO_BANKS];
  26     uint32_t falling[PXA2XX_GPIO_BANKS];
  27     uint32_t status[PXA2XX_GPIO_BANKS];
  28     uint32_t gpsr[PXA2XX_GPIO_BANKS];
  29     uint32_t gafr[PXA2XX_GPIO_BANKS * 2];
  30
  31     uint32_t prev_level[PXA2XX_GPIO_BANKS];
  32     qemu_irq handler[PXA2XX_GPIO_BANKS * 32];
  33     qemu_irq read_notify;
  34 };
  35
  36 static struct {
  37     enum {
  38         GPIO_NONE,
  39         GPLR,
  40         GPSR,
  41         GPCR,
  42         GPDR,
  43         GRER,
  44         GFER,
  45         GEDR,
  46         GAFR_L,
  47         GAFR_U,
  48     } reg;
  49     int bank;
  50 } pxa2xx_gpio_regs[0x200] = {
  51     [0 ... 0x1ff] = { GPIO_NONE, 0 },
  52 #define PXA2XX_REG(reg, a0, a1, a2, a3) \
  53     [a0] = { reg, 0 }, [a1] = { reg, 1 }, [a2] = { reg, 2 }, [a3] = { reg, 3 },
  54
  55     PXA2XX_REG(GPLR, 0x000, 0x004, 0x008, 0x100)
  56     PXA2XX_REG(GPSR, 0x018, 0x01c, 0x020, 0x118)
  57     PXA2XX_REG(GPCR, 0x024, 0x028, 0x02c, 0x124)
  58     PXA2XX_REG(GPDR, 0x00c, 0x010, 0x014, 0x10c)
  59     PXA2XX_REG(GRER, 0x030, 0x034, 0x038, 0x130)
  60     PXA2XX_REG(GFER, 0x03c, 0x040, 0x044, 0x13c)
  61     PXA2XX_REG(GEDR, 0x048, 0x04c, 0x050, 0x148)
  62     PXA2XX_REG(GAFR_L, 0x054, 0x05c, 0x064, 0x06c)
  63     PXA2XX_REG(GAFR_U, 0x058, 0x060, 0x068, 0x070)
  64 };
  65
  66 static void pxa2xx_gpio_irq_update(PXA2xxGPIOInfo *s)
  67 {
  68     if (s->status[0] & (1 << 0))
  69         qemu_irq_raise(s->pic[PXA2XX_PIC_GPIO_0]);
  70     else
  71         qemu_irq_lower(s->pic[PXA2XX_PIC_GPIO_0]);
  72
  73     if (s->status[0] & (1 << 1))
  74         qemu_irq_raise(s->pic[PXA2XX_PIC_GPIO_1]);
  75     else
  76         qemu_irq_lower(s->pic[PXA2XX_PIC_GPIO_1]);
  77
  78     if ((s->status[0] & ~3) | s->status[1] | s->status[2] | s->status[3])
  79         qemu_irq_raise(s->pic[PXA2XX_PIC_GPIO_X]);
  80     else
  81         qemu_irq_lower(s->pic[PXA2XX_PIC_GPIO_X]);
  82 }
  83
  84 /* Bitmap of pins used as standby and sleep wake-up sources.  */
  85 static const int pxa2xx_gpio_wake[PXA2XX_GPIO_BANKS] = {
  86     0x8003fe1b, 0x002001fc, 0xec080000, 0x0012007f,
  87 };
  88
  89 static void pxa2xx_gpio_set(void *opaque, int line, int level)
  90 {
  91     PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
  92     int bank;
  93     uint32_t mask;
  94
  95     if (line >= s->lines) {
  96         printf("%s: No GPIO pin %i\n", __FUNCTION__, line);
  97         return;
  98     }
  99
 100     bank = line >> 5;
 101     mask = 1 << (line & 31);
 102
 103     if (level) {
 104         s->status[bank] |= s->rising[bank] & mask &
 105                 ~s->ilevel[bank] & ~s->dir[bank];
 106         s->ilevel[bank] |= mask;
 107     } else {
 108         s->status[bank] |= s->falling[bank] & mask &
 109                 s->ilevel[bank] & ~s->dir[bank];
 110         s->ilevel[bank] &= ~mask;
 111     }
 112
 113     if (s->status[bank] & mask)
 114         pxa2xx_gpio_irq_update(s);
 115
 116     /* Wake-up GPIOs */
 117     if (s->cpu_env->halted && (mask & ~s->dir[bank] & pxa2xx_gpio_wake[bank]))
 118         cpu_interrupt(s->cpu_env, CPU_INTERRUPT_EXITTB);
 119 }
 120
 121 static void pxa2xx_gpio_handler_update(PXA2xxGPIOInfo *s) {
 122     uint32_t level, diff;
 123     int i, bit, line;
 124     for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
 125         level = s->olevel[i] & s->dir[i];
 126
 127         for (diff = s->prev_level[i] ^ level; diff; diff ^= 1 << bit) {
 128             bit = ffs(diff) - 1;
 129             line = bit + 32 * i;
 130             qemu_set_irq(s->handler[line], (level >> bit) & 1);
 131         }
 132
 133         s->prev_level[i] = level;
 134     }
 135 }
 136
 137 static uint32_t pxa2xx_gpio_read(void *opaque, target_phys_addr_t offset)
 138 {
 139     PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
 140     uint32_t ret;
 141     int bank;
 142     if (offset >= 0x200)
 143         return 0;
 144
 145     bank = pxa2xx_gpio_regs[offset].bank;
 146     switch (pxa2xx_gpio_regs[offset].reg) {
 147     case GPDR:          /* GPIO Pin-Direction registers */
 148         return s->dir[bank];
 149
 150     case GPSR:          /* GPIO Pin-Output Set registers */
 151         printf("%s: Read from a write-only register " REG_FMT "\n",
 152                         __FUNCTION__, offset);
 153         return s->gpsr[bank];   /* Return last written value.  */
 154
 155     case GPCR:          /* GPIO Pin-Output Clear registers */
 156         printf("%s: Read from a write-only register " REG_FMT "\n",
 157                         __FUNCTION__, offset);
 158         return 31337;           /* Specified as unpredictable in the docs.  */
 159
 160     case GRER:          /* GPIO Rising-Edge Detect Enable registers */
 161         return s->rising[bank];
 162
 163     case GFER:          /* GPIO Falling-Edge Detect Enable registers */
 164         return s->falling[bank];
 165
 166     case GAFR_L:        /* GPIO Alternate Function registers */
 167         return s->gafr[bank * 2];
 168
 169     case GAFR_U:        /* GPIO Alternate Function registers */
 170         return s->gafr[bank * 2 + 1];
 171
 172     case GPLR:          /* GPIO Pin-Level registers */
 173         ret = (s->olevel[bank] & s->dir[bank]) |
 174                 (s->ilevel[bank] & ~s->dir[bank]);
 175         qemu_irq_raise(s->read_notify);
 176         return ret;
 177
 178     case GEDR:          /* GPIO Edge Detect Status registers */
 179         return s->status[bank];
 180
 181     default:
 182         hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
 183     }
 184
 185     return 0;
 186 }
 187
 188 static void pxa2xx_gpio_write(void *opaque,
 189                 target_phys_addr_t offset, uint32_t value)
 190 {
 191     PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
 192     int bank;
 193     if (offset >= 0x200)
 194         return;
 195
 196     bank = pxa2xx_gpio_regs[offset].bank;
 197     switch (pxa2xx_gpio_regs[offset].reg) {
 198     case GPDR:          /* GPIO Pin-Direction registers */
 199         s->dir[bank] = value;
 200         pxa2xx_gpio_handler_update(s);
 201         break;
 202
 203     case GPSR:          /* GPIO Pin-Output Set registers */
 204         s->olevel[bank] |= value;
 205         pxa2xx_gpio_handler_update(s);
 206         s->gpsr[bank] = value;
 207         break;
 208
 209     case GPCR:          /* GPIO Pin-Output Clear registers */
 210         s->olevel[bank] &= ~value;
 211         pxa2xx_gpio_handler_update(s);
 212         break;
 213
 214     case GRER:          /* GPIO Rising-Edge Detect Enable registers */
 215         s->rising[bank] = value;
 216         break;
 217
 218     case GFER:          /* GPIO Falling-Edge Detect Enable registers */
 219         s->falling[bank] = value;
 220         break;
 221
 222     case GAFR_L:        /* GPIO Alternate Function registers */
 223         s->gafr[bank * 2] = value;
 224         break;
 225
 226     case GAFR_U:        /* GPIO Alternate Function registers */
 227         s->gafr[bank * 2 + 1] = value;
 228         break;
 229
 230     case GEDR:          /* GPIO Edge Detect Status registers */
 231         s->status[bank] &= ~value;
 232         pxa2xx_gpio_irq_update(s);
 233         break;
 234
 235     default:
 236         hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
 237     }
 238 }
 239
 240 static CPUReadMemoryFunc *pxa2xx_gpio_readfn[] = {
 241     pxa2xx_gpio_read,
 242     pxa2xx_gpio_read,
 243     pxa2xx_gpio_read
 244 };
 245
 246 static CPUWriteMemoryFunc *pxa2xx_gpio_writefn[] = {
 247     pxa2xx_gpio_write,
 248     pxa2xx_gpio_write,
 249     pxa2xx_gpio_write
 250 };
 251
 252 static void pxa2xx_gpio_save(QEMUFile *f, void *opaque)
 253 {
 254     PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
 255     int i;
 256
 257     qemu_put_be32(f, s->lines);
 258
 259     for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
 260         qemu_put_be32s(f, &s->ilevel[i]);
 261         qemu_put_be32s(f, &s->olevel[i]);
 262         qemu_put_be32s(f, &s->dir[i]);
 263         qemu_put_be32s(f, &s->rising[i]);
 264         qemu_put_be32s(f, &s->falling[i]);
 265         qemu_put_be32s(f, &s->status[i]);
 266         qemu_put_be32s(f, &s->gafr[i * 2 + 0]);
 267         qemu_put_be32s(f, &s->gafr[i * 2 + 1]);
 268
 269         qemu_put_be32s(f, &s->prev_level[i]);
 270     }
 271 }
 272
 273 static int pxa2xx_gpio_load(QEMUFile *f, void *opaque, int version_id)
 274 {
 275     PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
 276     int i;
 277
 278     if (qemu_get_be32(f) != s->lines)
 279         return -EINVAL;
 280
 281     for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
 282         qemu_get_be32s(f, &s->ilevel[i]);
 283         qemu_get_be32s(f, &s->olevel[i]);
 284         qemu_get_be32s(f, &s->dir[i]);
 285         qemu_get_be32s(f, &s->rising[i]);
 286         qemu_get_be32s(f, &s->falling[i]);
 287         qemu_get_be32s(f, &s->status[i]);
 288         qemu_get_be32s(f, &s->gafr[i * 2 + 0]);
 289         qemu_get_be32s(f, &s->gafr[i * 2 + 1]);
 290
 291         qemu_get_be32s(f, &s->prev_level[i]);
 292     }
 293
 294     return 0;
 295 }
 296
 297 PXA2xxGPIOInfo *pxa2xx_gpio_init(target_phys_addr_t base,
 298                 CPUState *env, qemu_irq *pic, int lines)
 299 {
 300     int iomemtype;
 301     PXA2xxGPIOInfo *s;
 302
 303     s = (PXA2xxGPIOInfo *)
 304             qemu_mallocz(sizeof(PXA2xxGPIOInfo));
 305     memset(s, 0, sizeof(PXA2xxGPIOInfo));
 306     s->pic = pic;
 307     s->lines = lines;
 308     s->cpu_env = env;
 309     s->in = qemu_allocate_irqs(pxa2xx_gpio_set, s, lines);
 310
 311     iomemtype = cpu_register_io_memory(pxa2xx_gpio_readfn,
 312                     pxa2xx_gpio_writefn, s);
 313     cpu_register_physical_memory(base, 0x00001000, iomemtype);
 314
 315     register_savevm("pxa2xx_gpio", 0, 0,
 316                     pxa2xx_gpio_save, pxa2xx_gpio_load, s);
 317
 318     return s;
 319 }
 320
 321 qemu_irq *pxa2xx_gpio_in_get(PXA2xxGPIOInfo *s)
 322 {
 323     return s->in;
 324 }
 325
 326 void pxa2xx_gpio_out_set(PXA2xxGPIOInfo *s,
 327                 int line, qemu_irq handler)
 328 {
 329     if (line >= s->lines) {
 330         printf("%s: No GPIO pin %i\n", __FUNCTION__, line);
 331         return;
 332     }
 333
 334     s->handler[line] = handler;
 335 }
 336
 337 /*
 338  * Registers a callback to notify on GPLR reads.  This normally
 339  * shouldn't be needed but it is used for the hack on Spitz machines.
 340  */
 341 void pxa2xx_gpio_read_notifier(PXA2xxGPIOInfo *s, qemu_irq handler)
 342 {
 343     s->read_notify = handler;
 344 }