root / hw / pl050.c @ 7f23f812
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/*
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* Arm PrimeCell PL050 Keyboard / Mouse Interface
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*
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* Copyright (c) 2006-2007 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licenced under the GPL.
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*/
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#include "sysbus.h" |
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#include "ps2.h" |
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typedef struct { |
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SysBusDevice busdev; |
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void *dev;
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uint32_t cr; |
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uint32_t clk; |
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uint32_t last; |
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int pending;
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qemu_irq irq; |
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int is_mouse;
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} pl050_state; |
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#define PL050_TXEMPTY (1 << 6) |
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#define PL050_TXBUSY (1 << 5) |
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#define PL050_RXFULL (1 << 4) |
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#define PL050_RXBUSY (1 << 3) |
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#define PL050_RXPARITY (1 << 2) |
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#define PL050_KMIC (1 << 1) |
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#define PL050_KMID (1 << 0) |
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static const unsigned char pl050_id[] = |
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{ 0x50, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 }; |
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static void pl050_update(void *opaque, int level) |
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{ |
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pl050_state *s = (pl050_state *)opaque; |
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int raise;
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s->pending = level; |
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raise = (s->pending && (s->cr & 0x10) != 0) |
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|| (s->cr & 0x08) != 0; |
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qemu_set_irq(s->irq, raise); |
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} |
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static uint32_t pl050_read(void *opaque, target_phys_addr_t offset) |
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{ |
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pl050_state *s = (pl050_state *)opaque; |
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if (offset >= 0xfe0 && offset < 0x1000) |
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return pl050_id[(offset - 0xfe0) >> 2]; |
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switch (offset >> 2) { |
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case 0: /* KMICR */ |
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return s->cr;
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case 1: /* KMISTAT */ |
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{ |
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uint8_t val; |
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uint32_t stat; |
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val = s->last; |
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val = val ^ (val >> 4);
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val = val ^ (val >> 2);
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val = (val ^ (val >> 1)) & 1; |
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stat = PL050_TXEMPTY; |
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if (val)
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stat |= PL050_RXPARITY; |
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if (s->pending)
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stat |= PL050_RXFULL; |
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return stat;
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} |
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case 2: /* KMIDATA */ |
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if (s->pending)
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s->last = ps2_read_data(s->dev); |
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return s->last;
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case 3: /* KMICLKDIV */ |
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return s->clk;
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case 4: /* KMIIR */ |
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return s->pending | 2; |
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default:
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hw_error("pl050_read: Bad offset %x\n", (int)offset); |
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return 0; |
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} |
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} |
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static void pl050_write(void *opaque, target_phys_addr_t offset, |
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uint32_t value) |
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{ |
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pl050_state *s = (pl050_state *)opaque; |
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switch (offset >> 2) { |
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case 0: /* KMICR */ |
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s->cr = value; |
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pl050_update(s, s->pending); |
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/* ??? Need to implement the enable/disable bit. */
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break;
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case 2: /* KMIDATA */ |
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/* ??? This should toggle the TX interrupt line. */
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/* ??? This means kbd/mouse can block each other. */
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if (s->is_mouse) {
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ps2_write_mouse(s->dev, value); |
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} else {
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ps2_write_keyboard(s->dev, value); |
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} |
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break;
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case 3: /* KMICLKDIV */ |
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s->clk = value; |
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return;
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default:
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hw_error("pl050_write: Bad offset %x\n", (int)offset); |
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} |
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} |
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static CPUReadMemoryFunc * const pl050_readfn[] = { |
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pl050_read, |
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pl050_read, |
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pl050_read |
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}; |
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static CPUWriteMemoryFunc * const pl050_writefn[] = { |
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pl050_write, |
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pl050_write, |
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pl050_write |
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}; |
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static int pl050_init(SysBusDevice *dev, int is_mouse) |
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{ |
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pl050_state *s = FROM_SYSBUS(pl050_state, dev); |
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int iomemtype;
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iomemtype = cpu_register_io_memory(pl050_readfn, |
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pl050_writefn, s); |
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sysbus_init_mmio(dev, 0x1000, iomemtype);
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sysbus_init_irq(dev, &s->irq); |
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s->is_mouse = is_mouse; |
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if (s->is_mouse)
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s->dev = ps2_mouse_init(pl050_update, s); |
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else
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s->dev = ps2_kbd_init(pl050_update, s); |
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/* ??? Save/restore. */
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return 0; |
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} |
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static int pl050_init_keyboard(SysBusDevice *dev) |
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{ |
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return pl050_init(dev, 0); |
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} |
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static int pl050_init_mouse(SysBusDevice *dev) |
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{ |
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return pl050_init(dev, 1); |
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} |
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static void pl050_register_devices(void) |
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{ |
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sysbus_register_dev("pl050_keyboard", sizeof(pl050_state), |
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pl050_init_keyboard); |
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sysbus_register_dev("pl050_mouse", sizeof(pl050_state), |
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pl050_init_mouse); |
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} |
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device_init(pl050_register_devices) |