root / hw / syborg_keyboard.c @ a8a358bf
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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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int 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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int 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 uint32_t syborg_keyboard_read(void *opaque, target_phys_addr_t offset) |
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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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uint32_t value) |
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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 CPUReadMemoryFunc * const syborg_keyboard_readfn[] = { |
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syborg_keyboard_read, |
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syborg_keyboard_read, |
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syborg_keyboard_read |
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}; |
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static CPUWriteMemoryFunc * const syborg_keyboard_writefn[] = { |
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syborg_keyboard_write, |
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syborg_keyboard_write, |
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syborg_keyboard_write |
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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 void syborg_keyboard_save(QEMUFile *f, void *opaque) |
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{ |
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SyborgKeyboardState *s = (SyborgKeyboardState *)opaque; |
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int i;
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qemu_put_be32(f, s->fifo_size); |
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qemu_put_be32(f, s->int_enabled); |
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qemu_put_be32(f, s->extension_bit); |
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qemu_put_be32(f, s->read_pos); |
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qemu_put_be32(f, s->read_count); |
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for (i = 0; i < s->fifo_size; i++) { |
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qemu_put_be32(f, s->key_fifo[i]); |
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} |
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} |
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static int syborg_keyboard_load(QEMUFile *f, void *opaque, int version_id) |
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{ |
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SyborgKeyboardState *s = (SyborgKeyboardState *)opaque; |
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uint32_t val; |
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int i;
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if (version_id != 1) |
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return -EINVAL;
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val = qemu_get_be32(f); |
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if (val != s->fifo_size)
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return -EINVAL;
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s->int_enabled = qemu_get_be32(f); |
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s->extension_bit = qemu_get_be32(f); |
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s->read_pos = qemu_get_be32(f); |
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s->read_count = qemu_get_be32(f); |
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for (i = 0; i < s->fifo_size; i++) { |
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s->key_fifo[i] = qemu_get_be32(f); |
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} |
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return 0; |
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} |
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static void syborg_keyboard_init(SysBusDevice *dev) |
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{ |
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SyborgKeyboardState *s = FROM_SYSBUS(SyborgKeyboardState, dev); |
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int iomemtype;
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sysbus_init_irq(dev, &s->irq); |
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iomemtype = cpu_register_io_memory(syborg_keyboard_readfn, |
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syborg_keyboard_writefn, s); |
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sysbus_init_mmio(dev, 0x1000, iomemtype);
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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 = qemu_mallocz(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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register_savevm("syborg_keyboard", -1, 1, |
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syborg_keyboard_save, syborg_keyboard_load, s); |
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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) |