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 licenced under the GPL.
   8  */
   9
  10 #include "sysbus.h"
  11 #include "ps2.h"
  12
  13 typedef struct {
  14     SysBusDevice busdev;
  15     void *dev;
  16     uint32_t cr;
  17     uint32_t clk;
  18     uint32_t last;
  19     int pending;
  20     qemu_irq irq;
  21     int is_mouse;
  22 } pl050_state;
  23
  24 #define PL050_TXEMPTY         (1 << 6)
  25 #define PL050_TXBUSY          (1 << 5)
  26 #define PL050_RXFULL          (1 << 4)
  27 #define PL050_RXBUSY          (1 << 3)
  28 #define PL050_RXPARITY        (1 << 2)
  29 #define PL050_KMIC            (1 << 1)
  30 #define PL050_KMID            (1 << 0)
  31
  32 static const unsigned char pl050_id[] =
  33 { 0x50, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
  34
  35 static void pl050_update(void *opaque, int level)
  36 {
  37     pl050_state *s = (pl050_state *)opaque;
  38     int raise;
  39
  40     s->pending = level;
  41     raise = (s->pending && (s->cr & 0x10) != 0)
  42             || (s->cr & 0x08) != 0;
  43     qemu_set_irq(s->irq, raise);
  44 }
  45
  46 static uint32_t pl050_read(void *opaque, target_phys_addr_t offset)
  47 {
  48     pl050_state *s = (pl050_state *)opaque;
  49     if (offset >= 0xfe0 && offset < 0x1000)
  50         return pl050_id[(offset - 0xfe0) >> 2];
  51
  52     switch (offset >> 2) {
  53     case 0: /* KMICR */
  54         return s->cr;
  55     case 1: /* KMISTAT */
  56         {
  57             uint8_t val;
  58             uint32_t stat;
  59
  60             val = s->last;
  61             val = val ^ (val >> 4);
  62             val = val ^ (val >> 2);
  63             val = (val ^ (val >> 1)) & 1;
  64
  65             stat = PL050_TXEMPTY;
  66             if (val)
  67                 stat |= PL050_RXPARITY;
  68             if (s->pending)
  69                 stat |= PL050_RXFULL;
  70
  71             return stat;
  72         }
  73     case 2: /* KMIDATA */
  74         if (s->pending)
  75             s->last = ps2_read_data(s->dev);
  76         return s->last;
  77     case 3: /* KMICLKDIV */
  78         return s->clk;
  79     case 4: /* KMIIR */
  80         return s->pending | 2;
  81     default:
  82         hw_error("pl050_read: Bad offset %x\n", (int)offset);
  83         return 0;
  84     }
  85 }
  86
  87 static void pl050_write(void *opaque, target_phys_addr_t offset,
  88                           uint32_t value)
  89 {
  90     pl050_state *s = (pl050_state *)opaque;
  91     switch (offset >> 2) {
  92     case 0: /* KMICR */
  93         s->cr = value;
  94         pl050_update(s, s->pending);
  95         /* ??? Need to implement the enable/disable bit.  */
  96         break;
  97     case 2: /* KMIDATA */
  98         /* ??? This should toggle the TX interrupt line.  */
  99         /* ??? This means kbd/mouse can block each other.  */
 100         if (s->is_mouse) {
 101             ps2_write_mouse(s->dev, value);
 102         } else {
 103             ps2_write_keyboard(s->dev, value);
 104         }
 105         break;
 106     case 3: /* KMICLKDIV */
 107         s->clk = value;
 108         return;
 109     default:
 110         hw_error("pl050_write: Bad offset %x\n", (int)offset);
 111     }
 112 }
 113 static CPUReadMemoryFunc * const pl050_readfn[] = {
 114    pl050_read,
 115    pl050_read,
 116    pl050_read
 117 };
 118
 119 static CPUWriteMemoryFunc * const pl050_writefn[] = {
 120    pl050_write,
 121    pl050_write,
 122    pl050_write
 123 };
 124
 125 static void pl050_init(SysBusDevice *dev, int is_mouse)
 126 {
 127     pl050_state *s = FROM_SYSBUS(pl050_state, dev);
 128     int iomemtype;
 129
 130     iomemtype = cpu_register_io_memory(pl050_readfn,
 131                                        pl050_writefn, s);
 132     sysbus_init_mmio(dev, 0x1000, iomemtype);
 133     sysbus_init_irq(dev, &s->irq);
 134     s->is_mouse = is_mouse;
 135     if (s->is_mouse)
 136         s->dev = ps2_mouse_init(pl050_update, s);
 137     else
 138         s->dev = ps2_kbd_init(pl050_update, s);
 139     /* ??? Save/restore.  */
 140 }
 141
 142 static void pl050_init_keyboard(SysBusDevice *dev)
 143 {
 144     pl050_init(dev, 0);
 145 }
 146
 147 static void pl050_init_mouse(SysBusDevice *dev)
 148 {
 149     pl050_init(dev, 1);
 150 }
 151
 152 static void pl050_register_devices(void)
 153 {
 154     sysbus_register_dev("pl050_keyboard", sizeof(pl050_state),
 155                         pl050_init_keyboard);
 156     sysbus_register_dev("pl050_mouse", sizeof(pl050_state),
 157                         pl050_init_mouse);
 158 }
 159
 160 device_init(pl050_register_devices)