mirror of https://github.com/buserror/mii_emu.git
80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
/*
|
|
* mii_titan_iie.c
|
|
*
|
|
* Copyright (C) 2023 Michel Pollet <buserror@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: MIT
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
|
|
#include "mii.h"
|
|
#include "mii_bank.h"
|
|
|
|
/*
|
|
* This is a mini driver for the Titan Accelerator IIe, not very common,
|
|
* but it's a nice card, and it's a good example of a driver that needs
|
|
* to use a softswitch ovverride to work.
|
|
* Also, I own one of these, and none of the other fancy ones, so this one
|
|
* gets the love.
|
|
*/
|
|
static bool
|
|
_mii_titan_access(
|
|
struct mii_bank_t *bank,
|
|
void *param,
|
|
uint16_t addr,
|
|
uint8_t * byte,
|
|
bool write)
|
|
{
|
|
mii_t *mii = param;
|
|
bool res = false;
|
|
mii_bank_t *main = &mii->bank[MII_BANK_MAIN];
|
|
if (write) {
|
|
printf("titan: write %02x to %04x\n", *byte, addr);
|
|
switch (*byte) {
|
|
case 5:
|
|
mii->speed = 3.58;
|
|
mii_bank_poke(main, 0xc086, *byte);
|
|
break;
|
|
case 1:
|
|
mii_bank_poke(main, 0xc086, *byte);
|
|
mii->speed = 1;
|
|
break;
|
|
case 0xa: // supposed to lock it too...
|
|
mii_bank_poke(main, 0xc086, *byte);
|
|
mii->speed = 1;
|
|
break;
|
|
default:
|
|
printf("titan: unknown speed %02x\n", *byte);
|
|
break;
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
_mii_titan_probe(
|
|
mii_t *mii,
|
|
uint32_t flags)
|
|
{
|
|
printf("%s %s\n", __func__, flags & MII_INIT_TITAN ? "enabled" : "disabled");
|
|
if (!(flags & MII_INIT_TITAN))
|
|
return 0;
|
|
// this override a read-only soft switch, but we only handle writes
|
|
// so it's fine
|
|
mii_set_sw_override(mii, 0xc086, _mii_titan_access, mii);
|
|
mii->speed = 3.58;
|
|
return 1;
|
|
}
|
|
|
|
static mii_slot_drv_t _driver = {
|
|
.name = "titan",
|
|
.desc = "Titan Accelerator IIe",
|
|
.enable_flag = MII_INIT_TITAN,
|
|
.probe = _mii_titan_probe,
|
|
};
|
|
MI_DRIVER_REGISTER(_driver);
|