hw/arm/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 "qemu/osdep.h"
  11 #include "cpu.h"
  12 #include "hw/hw.h"
  13 #include "hw/irq.h"
  14 #include "hw/qdev-properties.h"
  15 #include "hw/sysbus.h"
  16 #include "migration/vmstate.h"
  17 #include "hw/arm/pxa.h"
  18 #include "qemu/log.h"
  19 #include "qemu/module.h"
  20
  21 #define PXA2XX_GPIO_BANKS       4
  22
  23 #define TYPE_PXA2XX_GPIO "pxa2xx-gpio"
  24 #define PXA2XX_GPIO(obj) \
  25     OBJECT_CHECK(PXA2xxGPIOInfo, (obj), TYPE_PXA2XX_GPIO)
  26
  27 typedef struct PXA2xxGPIOInfo PXA2xxGPIOInfo;
  28 struct PXA2xxGPIOInfo {
  29     /*< private >*/
  30     SysBusDevice parent_obj;
  31     /*< public >*/
  32
  33     MemoryRegion iomem;
  34     qemu_irq irq0, irq1, irqX;
  35     int lines;
  36     int ncpu;
  37     ARMCPU *cpu;
  38
  39     /* XXX: GNU C vectors are more suitable */
  40     uint32_t ilevel[PXA2XX_GPIO_BANKS];
  41     uint32_t olevel[PXA2XX_GPIO_BANKS];
  42     uint32_t dir[PXA2XX_GPIO_BANKS];
  43     uint32_t rising[PXA2XX_GPIO_BANKS];
  44     uint32_t falling[PXA2XX_GPIO_BANKS];
  45     uint32_t status[PXA2XX_GPIO_BANKS];
  46     uint32_t gafr[PXA2XX_GPIO_BANKS * 2];
  47
  48     uint32_t prev_level[PXA2XX_GPIO_BANKS];
  49     qemu_irq handler[PXA2XX_GPIO_BANKS * 32];
  50     qemu_irq read_notify;
  51 };
  52
  53 static struct {
  54     enum {
  55         GPIO_NONE,
  56         GPLR,
  57         GPSR,
  58         GPCR,
  59         GPDR,
  60         GRER,
  61         GFER,
  62         GEDR,
  63         GAFR_L,
  64         GAFR_U,
  65     } reg;
  66     int bank;
  67 } pxa2xx_gpio_regs[0x200] = {
  68     [0 ... 0x1ff] = { GPIO_NONE, 0 },
  69 #define PXA2XX_REG(reg, a0, a1, a2, a3) \
  70     [a0] = { reg, 0 }, [a1] = { reg, 1 }, [a2] = { reg, 2 }, [a3] = { reg, 3 },
  71
  72     PXA2XX_REG(GPLR, 0x000, 0x004, 0x008, 0x100)
  73     PXA2XX_REG(GPSR, 0x018, 0x01c, 0x020, 0x118)
  74     PXA2XX_REG(GPCR, 0x024, 0x028, 0x02c, 0x124)
  75     PXA2XX_REG(GPDR, 0x00c, 0x010, 0x014, 0x10c)
  76     PXA2XX_REG(GRER, 0x030, 0x034, 0x038, 0x130)
  77     PXA2XX_REG(GFER, 0x03c, 0x040, 0x044, 0x13c)
  78     PXA2XX_REG(GEDR, 0x048, 0x04c, 0x050, 0x148)
  79     PXA2XX_REG(GAFR_L, 0x054, 0x05c, 0x064, 0x06c)
  80     PXA2XX_REG(GAFR_U, 0x058, 0x060, 0x068, 0x070)
  81 };
  82
  83 static void pxa2xx_gpio_irq_update(PXA2xxGPIOInfo *s)
  84 {
  85     if (s->status[0] & (1 << 0))
  86         qemu_irq_raise(s->irq0);
  87     else
  88         qemu_irq_lower(s->irq0);
  89
  90     if (s->status[0] & (1 << 1))
  91         qemu_irq_raise(s->irq1);
  92     else
  93         qemu_irq_lower(s->irq1);
  94
  95     if ((s->status[0] & ~3) | s->status[1] | s->status[2] | s->status[3])
  96         qemu_irq_raise(s->irqX);
  97     else
  98         qemu_irq_lower(s->irqX);
  99 }
 100
 101 /* Bitmap of pins used as standby and sleep wake-up sources.  */
 102 static const int pxa2xx_gpio_wake[PXA2XX_GPIO_BANKS] = {
 103     0x8003fe1b, 0x002001fc, 0xec080000, 0x0012007f,
 104 };
 105
 106 static void pxa2xx_gpio_set(void *opaque, int line, int level)
 107 {
 108     PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
 109     CPUState *cpu = CPU(s->cpu);
 110     int bank;
 111     uint32_t mask;
 112
 113     if (line >= s->lines) {
 114         printf("%s: No GPIO pin %i\n", __func__, line);
 115         return;
 116     }
 117
 118     bank = line >> 5;
 119     mask = 1U << (line & 31);
 120
 121     if (level) {
 122         s->status[bank] |= s->rising[bank] & mask &
 123                 ~s->ilevel[bank] & ~s->dir[bank];
 124         s->ilevel[bank] |= mask;
 125     } else {
 126         s->status[bank] |= s->falling[bank] & mask &
 127                 s->ilevel[bank] & ~s->dir[bank];
 128         s->ilevel[bank] &= ~mask;
 129     }
 130
 131     if (s->status[bank] & mask)
 132         pxa2xx_gpio_irq_update(s);
 133
 134     /* Wake-up GPIOs */
 135     if (cpu->halted && (mask & ~s->dir[bank] & pxa2xx_gpio_wake[bank])) {
 136         cpu_interrupt(cpu, CPU_INTERRUPT_EXITTB);
 137     }
 138 }
 139
 140 static void pxa2xx_gpio_handler_update(PXA2xxGPIOInfo *s) {
 141     uint32_t level, diff;
 142     int i, bit, line;
 143     for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
 144         level = s->olevel[i] & s->dir[i];
 145
 146         for (diff = s->prev_level[i] ^ level; diff; diff ^= 1 << bit) {
 147             bit = ctz32(diff);
 148             line = bit + 32 * i;
 149             qemu_set_irq(s->handler[line], (level >> bit) & 1);
 150         }
 151
 152         s->prev_level[i] = level;
 153     }
 154 }
 155
 156 static uint64_t pxa2xx_gpio_read(void *opaque, hwaddr offset,
 157                                  unsigned size)
 158 {
 159     PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
 160     uint32_t ret;
 161     int bank;
 162     if (offset >= 0x200)
 163         return 0;
 164
 165     bank = pxa2xx_gpio_regs[offset].bank;
 166     switch (pxa2xx_gpio_regs[offset].reg) {
 167     case GPDR:          /* GPIO Pin-Direction registers */
 168         return s->dir[bank];
 169
 170     case GPSR:          /* GPIO Pin-Output Set registers */
 171         qemu_log_mask(LOG_GUEST_ERROR,
 172                       "pxa2xx GPIO: read from write only register GPSR\n");
 173         return 0;
 174
 175     case GPCR:          /* GPIO Pin-Output Clear registers */
 176         qemu_log_mask(LOG_GUEST_ERROR,
 177                       "pxa2xx GPIO: read from write only register GPCR\n");
 178         return 0;
 179
 180     case GRER:          /* GPIO Rising-Edge Detect Enable registers */
 181         return s->rising[bank];
 182
 183     case GFER:          /* GPIO Falling-Edge Detect Enable registers */
 184         return s->falling[bank];
 185
 186     case GAFR_L:        /* GPIO Alternate Function registers */
 187         return s->gafr[bank * 2];
 188
 189     case GAFR_U:        /* GPIO Alternate Function registers */
 190         return s->gafr[bank * 2 + 1];
 191
 192     case GPLR:          /* GPIO Pin-Level registers */
 193         ret = (s->olevel[bank] & s->dir[bank]) |
 194                 (s->ilevel[bank] & ~s->dir[bank]);
 195         qemu_irq_raise(s->read_notify);
 196         return ret;
 197
 198     case GEDR:          /* GPIO Edge Detect Status registers */
 199         return s->status[bank];
 200
 201     default:
 202         hw_error("%s: Bad offset " REG_FMT "\n", __func__, offset);
 203     }
 204
 205     return 0;
 206 }
 207
 208 static void pxa2xx_gpio_write(void *opaque, hwaddr offset,
 209                               uint64_t value, unsigned size)
 210 {
 211     PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
 212     int bank;
 213     if (offset >= 0x200)
 214         return;
 215
 216     bank = pxa2xx_gpio_regs[offset].bank;
 217     switch (pxa2xx_gpio_regs[offset].reg) {
 218     case GPDR:          /* GPIO Pin-Direction registers */
 219         s->dir[bank] = value;
 220         pxa2xx_gpio_handler_update(s);
 221         break;
 222
 223     case GPSR:          /* GPIO Pin-Output Set registers */
 224         s->olevel[bank] |= value;
 225         pxa2xx_gpio_handler_update(s);
 226         break;
 227
 228     case GPCR:          /* GPIO Pin-Output Clear registers */
 229         s->olevel[bank] &= ~value;
 230         pxa2xx_gpio_handler_update(s);
 231         break;
 232
 233     case GRER:          /* GPIO Rising-Edge Detect Enable registers */
 234         s->rising[bank] = value;
 235         break;
 236
 237     case GFER:          /* GPIO Falling-Edge Detect Enable registers */
 238         s->falling[bank] = value;
 239         break;
 240
 241     case GAFR_L:        /* GPIO Alternate Function registers */
 242         s->gafr[bank * 2] = value;
 243         break;
 244
 245     case GAFR_U:        /* GPIO Alternate Function registers */
 246         s->gafr[bank * 2 + 1] = value;
 247         break;
 248
 249     case GEDR:          /* GPIO Edge Detect Status registers */
 250         s->status[bank] &= ~value;
 251         pxa2xx_gpio_irq_update(s);
 252         break;
 253
 254     default:
 255         hw_error("%s: Bad offset " REG_FMT "\n", __func__, offset);
 256     }
 257 }
 258
 259 static const MemoryRegionOps pxa_gpio_ops = {
 260     .read = pxa2xx_gpio_read,
 261     .write = pxa2xx_gpio_write,
 262     .endianness = DEVICE_NATIVE_ENDIAN,
 263 };
 264
 265 DeviceState *pxa2xx_gpio_init(hwaddr base,
 266                               ARMCPU *cpu, DeviceState *pic, int lines)
 267 {
 268     CPUState *cs = CPU(cpu);
 269     DeviceState *dev;
 270
 271     dev = qdev_create(NULL, TYPE_PXA2XX_GPIO);
 272     qdev_prop_set_int32(dev, "lines", lines);
 273     qdev_prop_set_int32(dev, "ncpu", cs->cpu_index);
 274     qdev_init_nofail(dev);
 275
 276     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
 277     sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0,
 278                     qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_0));
 279     sysbus_connect_irq(SYS_BUS_DEVICE(dev), 1,
 280                     qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_1));
 281     sysbus_connect_irq(SYS_BUS_DEVICE(dev), 2,
 282                     qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_X));
 283
 284     return dev;
 285 }
 286
 287 static void pxa2xx_gpio_initfn(Object *obj)
 288 {
 289     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 290     DeviceState *dev = DEVICE(sbd);
 291     PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);
 292
 293     memory_region_init_io(&s->iomem, obj, &pxa_gpio_ops,
 294                           s, "pxa2xx-gpio", 0x1000);
 295     sysbus_init_mmio(sbd, &s->iomem);
 296     sysbus_init_irq(sbd, &s->irq0);
 297     sysbus_init_irq(sbd, &s->irq1);
 298     sysbus_init_irq(sbd, &s->irqX);
 299 }
 300
 301 static void pxa2xx_gpio_realize(DeviceState *dev, Error **errp)
 302 {
 303     PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);
 304
 305     s->cpu = ARM_CPU(qemu_get_cpu(s->ncpu));
 306
 307     qdev_init_gpio_in(dev, pxa2xx_gpio_set, s->lines);
 308     qdev_init_gpio_out(dev, s->handler, s->lines);
 309 }
 310
 311 /*
 312  * Registers a callback to notify on GPLR reads.  This normally
 313  * shouldn't be needed but it is used for the hack on Spitz machines.
 314  */
 315 void pxa2xx_gpio_read_notifier(DeviceState *dev, qemu_irq handler)
 316 {
 317     PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);
 318
 319     s->read_notify = handler;
 320 }
 321
 322 static const VMStateDescription vmstate_pxa2xx_gpio_regs = {
 323     .name = "pxa2xx-gpio",
 324     .version_id = 1,
 325     .minimum_version_id = 1,
 326     .fields = (VMStateField[]) {
 327         VMSTATE_UINT32_ARRAY(ilevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
 328         VMSTATE_UINT32_ARRAY(olevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
 329         VMSTATE_UINT32_ARRAY(dir, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
 330         VMSTATE_UINT32_ARRAY(rising, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
 331         VMSTATE_UINT32_ARRAY(falling, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
 332         VMSTATE_UINT32_ARRAY(status, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
 333         VMSTATE_UINT32_ARRAY(gafr, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS * 2),
 334         VMSTATE_UINT32_ARRAY(prev_level, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
 335         VMSTATE_END_OF_LIST(),
 336     },
 337 };
 338
 339 static Property pxa2xx_gpio_properties[] = {
 340     DEFINE_PROP_INT32("lines", PXA2xxGPIOInfo, lines, 0),
 341     DEFINE_PROP_INT32("ncpu", PXA2xxGPIOInfo, ncpu, 0),
 342     DEFINE_PROP_END_OF_LIST(),
 343 };
 344
 345 static void pxa2xx_gpio_class_init(ObjectClass *klass, void *data)
 346 {
 347     DeviceClass *dc = DEVICE_CLASS(klass);
 348
 349     dc->desc = "PXA2xx GPIO controller";
 350     dc->props = pxa2xx_gpio_properties;
 351     dc->vmsd = &vmstate_pxa2xx_gpio_regs;
 352     dc->realize = pxa2xx_gpio_realize;
 353 }
 354
 355 static const TypeInfo pxa2xx_gpio_info = {
 356     .name          = TYPE_PXA2XX_GPIO,
 357     .parent        = TYPE_SYS_BUS_DEVICE,
 358     .instance_size = sizeof(PXA2xxGPIOInfo),
 359     .instance_init = pxa2xx_gpio_initfn,
 360     .class_init    = pxa2xx_gpio_class_init,
 361 };
 362
 363 static void pxa2xx_gpio_register_types(void)
 364 {
 365     type_register_static(&pxa2xx_gpio_info);
 366 }
 367
 368 type_init(pxa2xx_gpio_register_types)