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 #include "qemu/module.h"
  15
  16 #define TYPE_PL050 "pl050"
  17 #define PL050(obj) OBJECT_CHECK(PL050State, (obj), TYPE_PL050)
  18
  19 typedef struct PL050State {
  20     SysBusDevice parent_obj;
  21
  22     MemoryRegion iomem;
  23     void *dev;
  24     uint32_t cr;
  25     uint32_t clk;
  26     uint32_t last;
  27     int pending;
  28     qemu_irq irq;
  29     bool is_mouse;
  30 } PL050State;
  31
  32 static const VMStateDescription vmstate_pl050 = {
  33     .name = "pl050",
  34     .version_id = 2,
  35     .minimum_version_id = 2,
  36     .fields = (VMStateField[]) {
  37         VMSTATE_UINT32(cr, PL050State),
  38         VMSTATE_UINT32(clk, PL050State),
  39         VMSTATE_UINT32(last, PL050State),
  40         VMSTATE_INT32(pending, PL050State),
  41         VMSTATE_END_OF_LIST()
  42     }
  43 };
  44
  45 #define PL050_TXEMPTY         (1 << 6)
  46 #define PL050_TXBUSY          (1 << 5)
  47 #define PL050_RXFULL          (1 << 4)
  48 #define PL050_RXBUSY          (1 << 3)
  49 #define PL050_RXPARITY        (1 << 2)
  50 #define PL050_KMIC            (1 << 1)
  51 #define PL050_KMID            (1 << 0)
  52
  53 static const unsigned char pl050_id[] =
  54 { 0x50, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
  55
  56 static void pl050_update(void *opaque, int level)
  57 {
  58     PL050State *s = (PL050State *)opaque;
  59     int raise;
  60
  61     s->pending = level;
  62     raise = (s->pending && (s->cr & 0x10) != 0)
  63             || (s->cr & 0x08) != 0;
  64     qemu_set_irq(s->irq, raise);
  65 }
  66
  67 static uint64_t pl050_read(void *opaque, hwaddr offset,
  68                            unsigned size)
  69 {
  70     PL050State *s = (PL050State *)opaque;
  71     if (offset >= 0xfe0 && offset < 0x1000)
  72         return pl050_id[(offset - 0xfe0) >> 2];
  73
  74     switch (offset >> 2) {
  75     case 0: /* KMICR */
  76         return s->cr;
  77     case 1: /* KMISTAT */
  78         {
  79             uint8_t val;
  80             uint32_t stat;
  81
  82             val = s->last;
  83             val = val ^ (val >> 4);
  84             val = val ^ (val >> 2);
  85             val = (val ^ (val >> 1)) & 1;
  86
  87             stat = PL050_TXEMPTY;
  88             if (val)
  89                 stat |= PL050_RXPARITY;
  90             if (s->pending)
  91                 stat |= PL050_RXFULL;
  92
  93             return stat;
  94         }
  95     case 2: /* KMIDATA */
  96         if (s->pending)
  97             s->last = ps2_read_data(s->dev);
  98         return s->last;
  99     case 3: /* KMICLKDIV */
 100         return s->clk;
 101     case 4: /* KMIIR */
 102         return s->pending | 2;
 103     default:
 104         qemu_log_mask(LOG_GUEST_ERROR,
 105                       "pl050_read: Bad offset %x\n", (int)offset);
 106         return 0;
 107     }
 108 }
 109
 110 static void pl050_write(void *opaque, hwaddr offset,
 111                         uint64_t value, unsigned size)
 112 {
 113     PL050State *s = (PL050State *)opaque;
 114     switch (offset >> 2) {
 115     case 0: /* KMICR */
 116         s->cr = value;
 117         pl050_update(s, s->pending);
 118         /* ??? Need to implement the enable/disable bit.  */
 119         break;
 120     case 2: /* KMIDATA */
 121         /* ??? This should toggle the TX interrupt line.  */
 122         /* ??? This means kbd/mouse can block each other.  */
 123         if (s->is_mouse) {
 124             ps2_write_mouse(s->dev, value);
 125         } else {
 126             ps2_write_keyboard(s->dev, value);
 127         }
 128         break;
 129     case 3: /* KMICLKDIV */
 130         s->clk = value;
 131         return;
 132     default:
 133         qemu_log_mask(LOG_GUEST_ERROR,
 134                       "pl050_write: Bad offset %x\n", (int)offset);
 135     }
 136 }
 137 static const MemoryRegionOps pl050_ops = {
 138     .read = pl050_read,
 139     .write = pl050_write,
 140     .endianness = DEVICE_NATIVE_ENDIAN,
 141 };
 142
 143 static void pl050_realize(DeviceState *dev, Error **errp)
 144 {
 145     PL050State *s = PL050(dev);
 146     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 147
 148     memory_region_init_io(&s->iomem, OBJECT(s), &pl050_ops, s, "pl050", 0x1000);
 149     sysbus_init_mmio(sbd, &s->iomem);
 150     sysbus_init_irq(sbd, &s->irq);
 151     if (s->is_mouse) {
 152         s->dev = ps2_mouse_init(pl050_update, s);
 153     } else {
 154         s->dev = ps2_kbd_init(pl050_update, s);
 155     }
 156 }
 157
 158 static void pl050_keyboard_init(Object *obj)
 159 {
 160     PL050State *s = PL050(obj);
 161
 162     s->is_mouse = false;
 163 }
 164
 165 static void pl050_mouse_init(Object *obj)
 166 {
 167     PL050State *s = PL050(obj);
 168
 169     s->is_mouse = true;
 170 }
 171
 172 static const TypeInfo pl050_kbd_info = {
 173     .name          = "pl050_keyboard",
 174     .parent        = TYPE_PL050,
 175     .instance_init = pl050_keyboard_init,
 176 };
 177
 178 static const TypeInfo pl050_mouse_info = {
 179     .name          = "pl050_mouse",
 180     .parent        = TYPE_PL050,
 181     .instance_init = pl050_mouse_init,
 182 };
 183
 184 static void pl050_class_init(ObjectClass *oc, void *data)
 185 {
 186     DeviceClass *dc = DEVICE_CLASS(oc);
 187
 188     dc->realize = pl050_realize;
 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)