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, target_phys_addr_t 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         hw_error("pl050_read: Bad offset %x\n", (int)offset);
  99         return 0;
 100     }
 101 }
 102
 103 static void pl050_write(void *opaque, target_phys_addr_t offset,
 104                         uint64_t value, unsigned size)
 105 {
 106     pl050_state *s = (pl050_state *)opaque;
 107     switch (offset >> 2) {
 108     case 0: /* KMICR */
 109         s->cr = value;
 110         pl050_update(s, s->pending);
 111         /* ??? Need to implement the enable/disable bit.  */
 112         break;
 113     case 2: /* KMIDATA */
 114         /* ??? This should toggle the TX interrupt line.  */
 115         /* ??? This means kbd/mouse can block each other.  */
 116         if (s->is_mouse) {
 117             ps2_write_mouse(s->dev, value);
 118         } else {
 119             ps2_write_keyboard(s->dev, value);
 120         }
 121         break;
 122     case 3: /* KMICLKDIV */
 123         s->clk = value;
 124         return;
 125     default:
 126         hw_error("pl050_write: Bad offset %x\n", (int)offset);
 127     }
 128 }
 129 static const MemoryRegionOps pl050_ops = {
 130     .read = pl050_read,
 131     .write = pl050_write,
 132     .endianness = DEVICE_NATIVE_ENDIAN,
 133 };
 134
 135 static int pl050_init(SysBusDevice *dev, int is_mouse)
 136 {
 137     pl050_state *s = FROM_SYSBUS(pl050_state, dev);
 138
 139     memory_region_init_io(&s->iomem, &pl050_ops, s, "pl050", 0x1000);
 140     sysbus_init_mmio(dev, &s->iomem);
 141     sysbus_init_irq(dev, &s->irq);
 142     s->is_mouse = is_mouse;
 143     if (s->is_mouse)
 144         s->dev = ps2_mouse_init(pl050_update, s);
 145     else
 146         s->dev = ps2_kbd_init(pl050_update, s);
 147     return 0;
 148 }
 149
 150 static int pl050_init_keyboard(SysBusDevice *dev)
 151 {
 152     return pl050_init(dev, 0);
 153 }
 154
 155 static int pl050_init_mouse(SysBusDevice *dev)
 156 {
 157     return pl050_init(dev, 1);
 158 }
 159
 160 static SysBusDeviceInfo pl050_kbd_info = {
 161     .init = pl050_init_keyboard,
 162     .qdev.name  = "pl050_keyboard",
 163     .qdev.size  = sizeof(pl050_state),
 164     .qdev.vmsd = &vmstate_pl050,
 165 };
 166
 167 static SysBusDeviceInfo pl050_mouse_info = {
 168     .init = pl050_init_mouse,
 169     .qdev.name  = "pl050_mouse",
 170     .qdev.size  = sizeof(pl050_state),
 171     .qdev.vmsd = &vmstate_pl050,
 172 };
 173
 174 static void pl050_register_devices(void)
 175 {
 176     sysbus_register_withprop(&pl050_kbd_info);
 177     sysbus_register_withprop(&pl050_mouse_info);
 178 }
 179
 180 device_init(pl050_register_devices)