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