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