hw/input/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 "qemu/osdep.h"
  11 #include "hw/sysbus.h"
  12 #include "hw/input/ps2.h"
  13
  14 #define TYPE_PL050 "pl050"
  15 #define PL050(obj) OBJECT_CHECK(PL050State, (obj), TYPE_PL050)
  16
  17 typedef struct PL050State {
  18     SysBusDevice parent_obj;
  19
  20     MemoryRegion iomem;
  21     void *dev;
  22     uint32_t cr;
  23     uint32_t clk;
  24     uint32_t last;
  25     int pending;
  26     qemu_irq irq;
  27     bool is_mouse;
  28 } PL050State;
  29
  30 static const VMStateDescription vmstate_pl050 = {
  31     .name = "pl050",
  32     .version_id = 2,
  33     .minimum_version_id = 2,
  34     .fields = (VMStateField[]) {
  35         VMSTATE_UINT32(cr, PL050State),
  36         VMSTATE_UINT32(clk, PL050State),
  37         VMSTATE_UINT32(last, PL050State),
  38         VMSTATE_INT32(pending, PL050State),
  39         VMSTATE_END_OF_LIST()
  40     }
  41 };
  42
  43 #define PL050_TXEMPTY         (1 << 6)
  44 #define PL050_TXBUSY          (1 << 5)
  45 #define PL050_RXFULL          (1 << 4)
  46 #define PL050_RXBUSY          (1 << 3)
  47 #define PL050_RXPARITY        (1 << 2)
  48 #define PL050_KMIC            (1 << 1)
  49 #define PL050_KMID            (1 << 0)
  50
  51 static const unsigned char pl050_id[] =
  52 { 0x50, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
  53
  54 static void pl050_update(void *opaque, int level)
  55 {
  56     PL050State *s = (PL050State *)opaque;
  57     int raise;
  58
  59     s->pending = level;
  60     raise = (s->pending && (s->cr & 0x10) != 0)
  61             || (s->cr & 0x08) != 0;
  62     qemu_set_irq(s->irq, raise);
  63 }
  64
  65 static uint64_t pl050_read(void *opaque, hwaddr offset,
  66                            unsigned size)
  67 {
  68     PL050State *s = (PL050State *)opaque;
  69     if (offset >= 0xfe0 && offset < 0x1000)
  70         return pl050_id[(offset - 0xfe0) >> 2];
  71
  72     switch (offset >> 2) {
  73     case 0: /* KMICR */
  74         return s->cr;
  75     case 1: /* KMISTAT */
  76         {
  77             uint8_t val;
  78             uint32_t stat;
  79
  80             val = s->last;
  81             val = val ^ (val >> 4);
  82             val = val ^ (val >> 2);
  83             val = (val ^ (val >> 1)) & 1;
  84
  85             stat = PL050_TXEMPTY;
  86             if (val)
  87                 stat |= PL050_RXPARITY;
  88             if (s->pending)
  89                 stat |= PL050_RXFULL;
  90
  91             return stat;
  92         }
  93     case 2: /* KMIDATA */
  94         if (s->pending)
  95             s->last = ps2_read_data(s->dev);
  96         return s->last;
  97     case 3: /* KMICLKDIV */
  98         return s->clk;
  99     case 4: /* KMIIR */
 100         return s->pending | 2;
 101     default:
 102         qemu_log_mask(LOG_GUEST_ERROR,
 103                       "pl050_read: Bad offset %x\n", (int)offset);
 104         return 0;
 105     }
 106 }
 107
 108 static void pl050_write(void *opaque, hwaddr offset,
 109                         uint64_t value, unsigned size)
 110 {
 111     PL050State *s = (PL050State *)opaque;
 112     switch (offset >> 2) {
 113     case 0: /* KMICR */
 114         s->cr = value;
 115         pl050_update(s, s->pending);
 116         /* ??? Need to implement the enable/disable bit.  */
 117         break;
 118     case 2: /* KMIDATA */
 119         /* ??? This should toggle the TX interrupt line.  */
 120         /* ??? This means kbd/mouse can block each other.  */
 121         if (s->is_mouse) {
 122             ps2_write_mouse(s->dev, value);
 123         } else {
 124             ps2_write_keyboard(s->dev, value);
 125         }
 126         break;
 127     case 3: /* KMICLKDIV */
 128         s->clk = value;
 129         return;
 130     default:
 131         qemu_log_mask(LOG_GUEST_ERROR,
 132                       "pl050_write: Bad offset %x\n", (int)offset);
 133     }
 134 }
 135 static const MemoryRegionOps pl050_ops = {
 136     .read = pl050_read,
 137     .write = pl050_write,
 138     .endianness = DEVICE_NATIVE_ENDIAN,
 139 };
 140
 141 static int pl050_initfn(SysBusDevice *dev)
 142 {
 143     PL050State *s = PL050(dev);
 144
 145     memory_region_init_io(&s->iomem, OBJECT(s), &pl050_ops, s, "pl050", 0x1000);
 146     sysbus_init_mmio(dev, &s->iomem);
 147     sysbus_init_irq(dev, &s->irq);
 148     if (s->is_mouse) {
 149         s->dev = ps2_mouse_init(pl050_update, s);
 150     } else {
 151         s->dev = ps2_kbd_init(pl050_update, s);
 152     }
 153     return 0;
 154 }
 155
 156 static void pl050_keyboard_init(Object *obj)
 157 {
 158     PL050State *s = PL050(obj);
 159
 160     s->is_mouse = false;
 161 }
 162
 163 static void pl050_mouse_init(Object *obj)
 164 {
 165     PL050State *s = PL050(obj);
 166
 167     s->is_mouse = true;
 168 }
 169
 170 static const TypeInfo pl050_kbd_info = {
 171     .name          = "pl050_keyboard",
 172     .parent        = TYPE_PL050,
 173     .instance_init = pl050_keyboard_init,
 174 };
 175
 176 static const TypeInfo pl050_mouse_info = {
 177     .name          = "pl050_mouse",
 178     .parent        = TYPE_PL050,
 179     .instance_init = pl050_mouse_init,
 180 };
 181
 182 static void pl050_class_init(ObjectClass *oc, void *data)
 183 {
 184     DeviceClass *dc = DEVICE_CLASS(oc);
 185     SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(oc);
 186
 187     sdc->init = pl050_initfn;
 188     dc->vmsd = &vmstate_pl050;
 189 }
 190
 191 static const TypeInfo pl050_type_info = {
 192     .name          = TYPE_PL050,
 193     .parent        = TYPE_SYS_BUS_DEVICE,
 194     .instance_size = sizeof(PL050State),
 195     .abstract      = true,
 196     .class_init    = pl050_class_init,
 197 };
 198
 199 static void pl050_register_types(void)
 200 {
 201     type_register_static(&pl050_type_info);
 202     type_register_static(&pl050_kbd_info);
 203     type_register_static(&pl050_mouse_info);
 204 }
 205
 206 type_init(pl050_register_types)