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 "migration/vmstate.h"
  13 #include "hw/input/ps2.h"
  14 #include "hw/irq.h"
  15 #include "qemu/log.h"
  16 #include "qemu/module.h"
  17 #include "qom/object.h"
  18
  19 #define TYPE_PL050 "pl050"
  20 OBJECT_DECLARE_SIMPLE_TYPE(PL050State, PL050)
  21
  22 struct PL050State {
  23     SysBusDevice parent_obj;
  24
  25     MemoryRegion iomem;
  26     void *dev;
  27     uint32_t cr;
  28     uint32_t clk;
  29     uint32_t last;
  30     int pending;
  31     qemu_irq irq;
  32     bool is_mouse;
  33 };
  34
  35 static const VMStateDescription vmstate_pl050 = {
  36     .name = "pl050",
  37     .version_id = 2,
  38     .minimum_version_id = 2,
  39     .fields = (VMStateField[]) {
  40         VMSTATE_UINT32(cr, PL050State),
  41         VMSTATE_UINT32(clk, PL050State),
  42         VMSTATE_UINT32(last, PL050State),
  43         VMSTATE_INT32(pending, PL050State),
  44         VMSTATE_END_OF_LIST()
  45     }
  46 };
  47
  48 #define PL050_TXEMPTY         (1 << 6)
  49 #define PL050_TXBUSY          (1 << 5)
  50 #define PL050_RXFULL          (1 << 4)
  51 #define PL050_RXBUSY          (1 << 3)
  52 #define PL050_RXPARITY        (1 << 2)
  53 #define PL050_KMIC            (1 << 1)
  54 #define PL050_KMID            (1 << 0)
  55
  56 static const unsigned char pl050_id[] =
  57 { 0x50, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
  58
  59 static void pl050_update(void *opaque, int level)
  60 {
  61     PL050State *s = (PL050State *)opaque;
  62     int raise;
  63
  64     s->pending = level;
  65     raise = (s->pending && (s->cr & 0x10) != 0)
  66             || (s->cr & 0x08) != 0;
  67     qemu_set_irq(s->irq, raise);
  68 }
  69
  70 static uint64_t pl050_read(void *opaque, hwaddr offset,
  71                            unsigned size)
  72 {
  73     PL050State *s = (PL050State *)opaque;
  74     if (offset >= 0xfe0 && offset < 0x1000)
  75         return pl050_id[(offset - 0xfe0) >> 2];
  76
  77     switch (offset >> 2) {
  78     case 0: /* KMICR */
  79         return s->cr;
  80     case 1: /* KMISTAT */
  81         {
  82             uint8_t val;
  83             uint32_t stat;
  84
  85             val = s->last;
  86             val = val ^ (val >> 4);
  87             val = val ^ (val >> 2);
  88             val = (val ^ (val >> 1)) & 1;
  89
  90             stat = PL050_TXEMPTY;
  91             if (val)
  92                 stat |= PL050_RXPARITY;
  93             if (s->pending)
  94                 stat |= PL050_RXFULL;
  95
  96             return stat;
  97         }
  98     case 2: /* KMIDATA */
  99         if (s->pending)
 100             s->last = ps2_read_data(s->dev);
 101         return s->last;
 102     case 3: /* KMICLKDIV */
 103         return s->clk;
 104     case 4: /* KMIIR */
 105         return s->pending | 2;
 106     default:
 107         qemu_log_mask(LOG_GUEST_ERROR,
 108                       "pl050_read: Bad offset %x\n", (int)offset);
 109         return 0;
 110     }
 111 }
 112
 113 static void pl050_write(void *opaque, hwaddr offset,
 114                         uint64_t value, unsigned size)
 115 {
 116     PL050State *s = (PL050State *)opaque;
 117     switch (offset >> 2) {
 118     case 0: /* KMICR */
 119         s->cr = value;
 120         pl050_update(s, s->pending);
 121         /* ??? Need to implement the enable/disable bit.  */
 122         break;
 123     case 2: /* KMIDATA */
 124         /* ??? This should toggle the TX interrupt line.  */
 125         /* ??? This means kbd/mouse can block each other.  */
 126         if (s->is_mouse) {
 127             ps2_write_mouse(s->dev, value);
 128         } else {
 129             ps2_write_keyboard(s->dev, value);
 130         }
 131         break;
 132     case 3: /* KMICLKDIV */
 133         s->clk = value;
 134         return;
 135     default:
 136         qemu_log_mask(LOG_GUEST_ERROR,
 137                       "pl050_write: Bad offset %x\n", (int)offset);
 138     }
 139 }
 140 static const MemoryRegionOps pl050_ops = {
 141     .read = pl050_read,
 142     .write = pl050_write,
 143     .endianness = DEVICE_NATIVE_ENDIAN,
 144 };
 145
 146 static void pl050_realize(DeviceState *dev, Error **errp)
 147 {
 148     PL050State *s = PL050(dev);
 149     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 150
 151     memory_region_init_io(&s->iomem, OBJECT(s), &pl050_ops, s, "pl050", 0x1000);
 152     sysbus_init_mmio(sbd, &s->iomem);
 153     sysbus_init_irq(sbd, &s->irq);
 154     if (s->is_mouse) {
 155         s->dev = ps2_mouse_init(pl050_update, s);
 156     } else {
 157         s->dev = ps2_kbd_init(pl050_update, s);
 158     }
 159 }
 160
 161 static void pl050_keyboard_init(Object *obj)
 162 {
 163     PL050State *s = PL050(obj);
 164
 165     s->is_mouse = false;
 166 }
 167
 168 static void pl050_mouse_init(Object *obj)
 169 {
 170     PL050State *s = PL050(obj);
 171
 172     s->is_mouse = true;
 173 }
 174
 175 static const TypeInfo pl050_kbd_info = {
 176     .name          = "pl050_keyboard",
 177     .parent        = TYPE_PL050,
 178     .instance_init = pl050_keyboard_init,
 179 };
 180
 181 static const TypeInfo pl050_mouse_info = {
 182     .name          = "pl050_mouse",
 183     .parent        = TYPE_PL050,
 184     .instance_init = pl050_mouse_init,
 185 };
 186
 187 static void pl050_class_init(ObjectClass *oc, void *data)
 188 {
 189     DeviceClass *dc = DEVICE_CLASS(oc);
 190
 191     dc->realize = pl050_realize;
 192     dc->vmsd = &vmstate_pl050;
 193 }
 194
 195 static const TypeInfo pl050_type_info = {
 196     .name          = TYPE_PL050,
 197     .parent        = TYPE_SYS_BUS_DEVICE,
 198     .instance_size = sizeof(PL050State),
 199     .abstract      = true,
 200     .class_init    = pl050_class_init,
 201 };
 202
 203 static void pl050_register_types(void)
 204 {
 205     type_register_static(&pl050_type_info);
 206     type_register_static(&pl050_kbd_info);
 207     type_register_static(&pl050_mouse_info);
 208 }
 209
 210 type_init(pl050_register_types)