hw/pl050.c

   1 /*
   2  * Arm PrimeCell PL050 Keyboard / Mouse Interface
   3  *
   4  * Copyright (c) 2006-2007 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licensed under the GPL.
   8  */
   9
  10 #include "sysbus.h"
  11 #include "ps2.h"
  12
  13 typedef struct {
  14     SysBusDevice busdev;
  15     MemoryRegion iomem;
  16     void *dev;
  17     uint32_t cr;
  18     uint32_t clk;
  19     uint32_t last;
  20     int pending;
  21     qemu_irq irq;
  22     int is_mouse;
  23 } pl050_state;
  24
  25 static const VMStateDescription vmstate_pl050 = {
  26     .name = "pl050",
  27     .version_id = 1,
  28     .minimum_version_id = 1,
  29     .fields = (VMStateField[]) {
  30         VMSTATE_UINT32(cr, pl050_state),
  31         VMSTATE_UINT32(clk, pl050_state),
  32         VMSTATE_UINT32(last, pl050_state),
  33         VMSTATE_INT32(pending, pl050_state),
  34         VMSTATE_INT32(is_mouse, pl050_state),
  35         VMSTATE_END_OF_LIST()
  36     }
  37 };
  38
  39 #define PL050_TXEMPTY         (1 << 6)
  40 #define PL050_TXBUSY          (1 << 5)
  41 #define PL050_RXFULL          (1 << 4)
  42 #define PL050_RXBUSY          (1 << 3)
  43 #define PL050_RXPARITY        (1 << 2)
  44 #define PL050_KMIC            (1 << 1)
  45 #define PL050_KMID            (1 << 0)
  46
  47 static const unsigned char pl050_id[] =
  48 { 0x50, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
  49
  50 static void pl050_update(void *opaque, int level)
  51 {
  52     pl050_state *s = (pl050_state *)opaque;
  53     int raise;
  54
  55     s->pending = level;
  56     raise = (s->pending && (s->cr & 0x10) != 0)
  57             || (s->cr & 0x08) != 0;
  58     qemu_set_irq(s->irq, raise);
  59 }
  60
  61 static uint64_t pl050_read(void *opaque, hwaddr offset,
  62                            unsigned size)
  63 {
  64     pl050_state *s = (pl050_state *)opaque;
  65     if (offset >= 0xfe0 && offset < 0x1000)
  66         return pl050_id[(offset - 0xfe0) >> 2];
  67
  68     switch (offset >> 2) {
  69     case 0: /* KMICR */
  70         return s->cr;
  71     case 1: /* KMISTAT */
  72         {
  73             uint8_t val;
  74             uint32_t stat;
  75
  76             val = s->last;
  77             val = val ^ (val >> 4);
  78             val = val ^ (val >> 2);
  79             val = (val ^ (val >> 1)) & 1;
  80
  81             stat = PL050_TXEMPTY;
  82             if (val)
  83                 stat |= PL050_RXPARITY;
  84             if (s->pending)
  85                 stat |= PL050_RXFULL;
  86
  87             return stat;
  88         }
  89     case 2: /* KMIDATA */
  90         if (s->pending)
  91             s->last = ps2_read_data(s->dev);
  92         return s->last;
  93     case 3: /* KMICLKDIV */
  94         return s->clk;
  95     case 4: /* KMIIR */
  96         return s->pending | 2;
  97     default:
  98         qemu_log_mask(LOG_GUEST_ERROR,
  99                       "pl050_read: Bad offset %x\n", (int)offset);
 100         return 0;
 101     }
 102 }
 103
 104 static void pl050_write(void *opaque, hwaddr offset,
 105                         uint64_t value, unsigned size)
 106 {
 107     pl050_state *s = (pl050_state *)opaque;
 108     switch (offset >> 2) {
 109     case 0: /* KMICR */
 110         s->cr = value;
 111         pl050_update(s, s->pending);
 112         /* ??? Need to implement the enable/disable bit.  */
 113         break;
 114     case 2: /* KMIDATA */
 115         /* ??? This should toggle the TX interrupt line.  */
 116         /* ??? This means kbd/mouse can block each other.  */
 117         if (s->is_mouse) {
 118             ps2_write_mouse(s->dev, value);
 119         } else {
 120             ps2_write_keyboard(s->dev, value);
 121         }
 122         break;
 123     case 3: /* KMICLKDIV */
 124         s->clk = value;
 125         return;
 126     default:
 127         qemu_log_mask(LOG_GUEST_ERROR,
 128                       "pl050_write: Bad offset %x\n", (int)offset);
 129     }
 130 }
 131 static const MemoryRegionOps pl050_ops = {
 132     .read = pl050_read,
 133     .write = pl050_write,
 134     .endianness = DEVICE_NATIVE_ENDIAN,
 135 };
 136
 137 static int pl050_init(SysBusDevice *dev, int is_mouse)
 138 {
 139     pl050_state *s = FROM_SYSBUS(pl050_state, dev);
 140
 141     memory_region_init_io(&s->iomem, &pl050_ops, s, "pl050", 0x1000);
 142     sysbus_init_mmio(dev, &s->iomem);
 143     sysbus_init_irq(dev, &s->irq);
 144     s->is_mouse = is_mouse;
 145     if (s->is_mouse)
 146         s->dev = ps2_mouse_init(pl050_update, s);
 147     else
 148         s->dev = ps2_kbd_init(pl050_update, s);
 149     return 0;
 150 }
 151
 152 static int pl050_init_keyboard(SysBusDevice *dev)
 153 {
 154     return pl050_init(dev, 0);
 155 }
 156
 157 static int pl050_init_mouse(SysBusDevice *dev)
 158 {
 159     return pl050_init(dev, 1);
 160 }
 161
 162 static void pl050_kbd_class_init(ObjectClass *klass, void *data)
 163 {
 164     DeviceClass *dc = DEVICE_CLASS(klass);
 165     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 166
 167     k->init = pl050_init_keyboard;
 168     dc->vmsd = &vmstate_pl050;
 169 }
 170
 171 static const TypeInfo pl050_kbd_info = {
 172     .name          = "pl050_keyboard",
 173     .parent        = TYPE_SYS_BUS_DEVICE,
 174     .instance_size = sizeof(pl050_state),
 175     .class_init    = pl050_kbd_class_init,
 176 };
 177
 178 static void pl050_mouse_class_init(ObjectClass *klass, void *data)
 179 {
 180     DeviceClass *dc = DEVICE_CLASS(klass);
 181     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 182
 183     k->init = pl050_init_mouse;
 184     dc->vmsd = &vmstate_pl050;
 185 }
 186
 187 static const TypeInfo pl050_mouse_info = {
 188     .name          = "pl050_mouse",
 189     .parent        = TYPE_SYS_BUS_DEVICE,
 190     .instance_size = sizeof(pl050_state),
 191     .class_init    = pl050_mouse_class_init,
 192 };
 193
 194 static void pl050_register_types(void)
 195 {
 196     type_register_static(&pl050_kbd_info);
 197     type_register_static(&pl050_mouse_info);
 198 }
 199
 200 type_init(pl050_register_types)