root / hw / syborg_keyboard.c @ 6620cb3c
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/*
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* Syborg keyboard controller.
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*
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* Copyright (c) 2008 CodeSourcery
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "sysbus.h" |
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#include "console.h" |
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#include "syborg.h" |
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//#define DEBUG_SYBORG_KEYBOARD
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#ifdef DEBUG_SYBORG_KEYBOARD
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#define DPRINTF(fmt, ...) \
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do { printf("syborg_keyboard: " fmt , ##args); } while (0) |
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#define BADF(fmt, ...) \
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do { fprintf(stderr, "syborg_keyboard: error: " fmt , ## __VA_ARGS__); \ |
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exit(1);} while (0) |
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#else
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#define DPRINTF(fmt, ...) do {} while(0) |
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#define BADF(fmt, ...) \
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do { fprintf(stderr, "syborg_keyboard: error: " fmt , ## __VA_ARGS__); \ |
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} while (0) |
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#endif
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enum {
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KBD_ID = 0,
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KBD_DATA = 1,
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KBD_FIFO_COUNT = 2,
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KBD_INT_ENABLE = 3,
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KBD_FIFO_SIZE = 4
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}; |
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typedef struct { |
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SysBusDevice busdev; |
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MemoryRegion iomem; |
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uint32_t int_enabled; |
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int extension_bit;
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uint32_t fifo_size; |
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uint32_t *key_fifo; |
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uint32_t read_pos, read_count; |
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qemu_irq irq; |
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} SyborgKeyboardState; |
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static void syborg_keyboard_update(SyborgKeyboardState *s) |
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{ |
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int level = s->read_count && s->int_enabled;
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DPRINTF("Update IRQ %d\n", level);
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qemu_set_irq(s->irq, level); |
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} |
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static uint64_t syborg_keyboard_read(void *opaque, target_phys_addr_t offset, |
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unsigned size)
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{ |
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SyborgKeyboardState *s = (SyborgKeyboardState *)opaque; |
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int c;
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DPRINTF("reg read %d\n", (int)offset); |
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offset &= 0xfff;
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switch (offset >> 2) { |
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case KBD_ID:
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return SYBORG_ID_KEYBOARD;
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case KBD_FIFO_COUNT:
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return s->read_count;
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case KBD_DATA:
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if (s->read_count == 0) { |
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c = -1;
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DPRINTF("FIFO underflow\n");
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} else {
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c = s->key_fifo[s->read_pos]; |
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DPRINTF("FIFO read 0x%x\n", c);
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s->read_count--; |
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s->read_pos++; |
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if (s->read_pos == s->fifo_size)
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s->read_pos = 0;
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} |
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syborg_keyboard_update(s); |
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return c;
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case KBD_INT_ENABLE:
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return s->int_enabled;
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case KBD_FIFO_SIZE:
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return s->fifo_size;
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default:
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cpu_abort(cpu_single_env, "syborg_keyboard_read: Bad offset %x\n",
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(int)offset);
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return 0; |
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} |
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} |
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static void syborg_keyboard_write(void *opaque, target_phys_addr_t offset, |
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uint64_t value, unsigned size)
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{ |
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SyborgKeyboardState *s = (SyborgKeyboardState *)opaque; |
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DPRINTF("reg write %d\n", (int)offset); |
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offset &= 0xfff;
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switch (offset >> 2) { |
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case KBD_INT_ENABLE:
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s->int_enabled = value; |
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syborg_keyboard_update(s); |
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break;
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default:
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cpu_abort(cpu_single_env, "syborg_keyboard_write: Bad offset %x\n",
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(int)offset);
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} |
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} |
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static const MemoryRegionOps syborg_keyboard_ops = { |
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.read = syborg_keyboard_read, |
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.write = syborg_keyboard_write, |
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.endianness = DEVICE_NATIVE_ENDIAN, |
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}; |
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static void syborg_keyboard_event(void *opaque, int keycode) |
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{ |
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SyborgKeyboardState *s = (SyborgKeyboardState *)opaque; |
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int slot;
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uint32_t val; |
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/* Strip off 0xe0 prefixes and reconstruct the full scancode. */
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if (keycode == 0xe0 && !s->extension_bit) { |
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DPRINTF("Extension bit\n");
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s->extension_bit = 0x80;
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return;
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} |
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val = (keycode & 0x7f) | s->extension_bit;
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if (keycode & 0x80) |
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val |= 0x80000000u;
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s->extension_bit = 0;
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DPRINTF("FIFO push 0x%x\n", val);
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slot = s->read_pos + s->read_count; |
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if (slot >= s->fifo_size)
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slot -= s->fifo_size; |
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if (s->read_count < s->fifo_size) {
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s->read_count++; |
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s->key_fifo[slot] = val; |
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} else {
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fprintf(stderr, "syborg_keyboard error! FIFO overflow\n");
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} |
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syborg_keyboard_update(s); |
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} |
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static const VMStateDescription vmstate_syborg_keyboard = { |
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.name = "syborg_keyboard",
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.version_id = 1,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.fields = (VMStateField[]) { |
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VMSTATE_UINT32_EQUAL(fifo_size, SyborgKeyboardState), |
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VMSTATE_UINT32(int_enabled, SyborgKeyboardState), |
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VMSTATE_UINT32(read_pos, SyborgKeyboardState), |
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VMSTATE_UINT32(read_count, SyborgKeyboardState), |
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VMSTATE_VARRAY_UINT32(key_fifo, SyborgKeyboardState, fifo_size, 1,
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vmstate_info_uint32, uint32), |
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VMSTATE_END_OF_LIST() |
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} |
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}; |
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static int syborg_keyboard_init(SysBusDevice *dev) |
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{ |
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SyborgKeyboardState *s = FROM_SYSBUS(SyborgKeyboardState, dev); |
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sysbus_init_irq(dev, &s->irq); |
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memory_region_init_io(&s->iomem, &syborg_keyboard_ops, s, |
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"keyboard", 0x1000); |
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sysbus_init_mmio_region(dev, &s->iomem); |
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if (s->fifo_size <= 0) { |
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fprintf(stderr, "syborg_keyboard: fifo too small\n");
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s->fifo_size = 16;
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} |
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s->key_fifo = g_malloc0(s->fifo_size * sizeof(s->key_fifo[0])); |
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qemu_add_kbd_event_handler(syborg_keyboard_event, s); |
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vmstate_register(&dev->qdev, -1, &vmstate_syborg_keyboard, s);
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return 0; |
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} |
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static SysBusDeviceInfo syborg_keyboard_info = {
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.init = syborg_keyboard_init, |
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.qdev.name = "syborg,keyboard",
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.qdev.size = sizeof(SyborgKeyboardState),
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.qdev.props = (Property[]) { |
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DEFINE_PROP_UINT32("fifo-size", SyborgKeyboardState, fifo_size, 16), |
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DEFINE_PROP_END_OF_LIST(), |
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} |
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}; |
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static void syborg_keyboard_register_devices(void) |
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{ |
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sysbus_register_withprop(&syborg_keyboard_info); |
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} |
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device_init(syborg_keyboard_register_devices) |