142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
/*
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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 "hw.h"
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#include "primecell.h"
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#include "ps2.h"
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typedef struct {
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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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cpu_abort (cpu_single_env, "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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cpu_abort (cpu_single_env, "pl050_write: Bad offset %x\n", (int)offset);
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}
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}
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static CPUReadMemoryFunc *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 *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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void pl050_init(uint32_t base, qemu_irq irq, int is_mouse)
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{
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int iomemtype;
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pl050_state *s;
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s = (pl050_state *)qemu_mallocz(sizeof(pl050_state));
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iomemtype = cpu_register_io_memory(0, pl050_readfn,
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pl050_writefn, s);
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cpu_register_physical_memory(base, 0x00001000, iomemtype);
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s->irq = irq;
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s->is_mouse = is_mouse;
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if (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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}
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