Files
86Box/src/sio/sio_fdc37c6xx.c
Jasmine Iwanek a61379eaee src/sio
2022-03-13 09:57:57 -04:00

463 lines
9.8 KiB
C

/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
*
* Implementation of the SMC FDC37C663 and FDC37C665 Super
* I/O Chips.
*
*
*
* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
* Miran Grca, <mgrca8@gmail.com>
*
* Copyright 2008-2020 Sarah Walker.
* Copyright 2016-2020 Miran Grca.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <86box/86box.h>
#include <86box/io.h>
#include <86box/timer.h>
#include <86box/device.h>
#include <86box/pci.h>
#include <86box/lpt.h>
#include <86box/serial.h>
#include <86box/hdc.h>
#include <86box/hdc_ide.h>
#include <86box/fdd.h>
#include <86box/fdc.h>
#include <86box/sio.h>
typedef struct {
uint8_t max_reg, chip_id,
tries, has_ide,
regs[16];
int cur_reg,
com3_addr, com4_addr;
fdc_t *fdc;
serial_t *uart[2];
} fdc37c6xx_t;
static void
set_com34_addr(fdc37c6xx_t *dev)
{
switch (dev->regs[1] & 0x60) {
case 0x00:
dev->com3_addr = 0x338;
dev->com4_addr = 0x238;
break;
case 0x20:
dev->com3_addr = COM3_ADDR;
dev->com4_addr = COM4_ADDR;
break;
case 0x40:
dev->com3_addr = COM3_ADDR;
dev->com4_addr = 0x2e0;
break;
case 0x60:
dev->com3_addr = 0x220;
dev->com4_addr = 0x228;
break;
}
}
static void
set_serial_addr(fdc37c6xx_t *dev, int port)
{
uint8_t shift = (port << 2);
double clock_src = 24000000.0 / 13.0;
if (dev->regs[4] & (1 << (4 + port)))
clock_src = 24000000.0 / 12.0;
serial_remove(dev->uart[port]);
if (dev->regs[2] & (4 << shift)) {
switch ((dev->regs[2] >> shift) & 3) {
case 0:
serial_setup(dev->uart[port], COM1_ADDR, COM1_IRQ);
break;
case 1:
serial_setup(dev->uart[port], COM2_ADDR, COM2_IRQ);
break;
case 2:
serial_setup(dev->uart[port], dev->com3_addr, COM3_IRQ);
break;
case 3:
serial_setup(dev->uart[port], dev->com4_addr, COM4_IRQ);
break;
}
}
serial_set_clock_src(dev->uart[port], clock_src);
}
static void
lpt1_handler(fdc37c6xx_t *dev)
{
lpt1_remove();
switch (dev->regs[1] & 3) {
case 1:
lpt1_init(LPT_MDA_ADDR);
lpt1_irq(7);
break;
case 2:
lpt1_init(LPT1_ADDR);
lpt1_irq(7 /*5*/);
break;
case 3:
lpt1_init(LPT2_ADDR);
lpt1_irq(7 /*5*/);
break;
}
}
static void
fdc_handler(fdc37c6xx_t *dev)
{
fdc_remove(dev->fdc);
if (dev->regs[0] & 0x10)
fdc_set_base(dev->fdc, (dev->regs[5] & 0x01) ? FDC_SECONDARY_ADDR : FDC_PRIMARY_ADDR);
}
static void
ide_handler(fdc37c6xx_t *dev)
{
/* TODO: Make an ide_disable(channel) and ide_enable(channel) so we can simplify this. */
if (dev->has_ide == 2) {
ide_sec_disable();
ide_set_base(1, (dev->regs[0x05] & 0x02) ? 0x170 : 0x1f0);
ide_set_side(1, (dev->regs[0x05] & 0x02) ? 0x376 : 0x3f6);
if (dev->regs[0x00] & 0x01)
ide_sec_enable();
} else if (dev->has_ide == 1) {
ide_pri_disable();
ide_set_base(0, (dev->regs[0x05] & 0x02) ? 0x170 : 0x1f0);
ide_set_side(0, (dev->regs[0x05] & 0x02) ? 0x376 : 0x3f6);
if (dev->regs[0x00] & 0x01)
ide_pri_enable();
}
}
static void
fdc37c6xx_write(uint16_t port, uint8_t val, void *priv)
{
fdc37c6xx_t *dev = (fdc37c6xx_t *) priv;
uint8_t valxor = 0;
if (dev->tries == 2) {
if (port == FDC_PRIMARY_ADDR) {
if (val == 0xaa)
dev->tries = 0;
else
dev->cur_reg = val;
} else {
if (dev->cur_reg > dev->max_reg)
return;
valxor = val ^ dev->regs[dev->cur_reg];
dev->regs[dev->cur_reg] = val;
switch(dev->cur_reg) {
case 0:
if (dev->has_ide && (valxor & 0x01))
ide_handler(dev);
if (valxor & 0x10)
fdc_handler(dev);
break;
case 1:
if (valxor & 3)
lpt1_handler(dev);
if (valxor & 0x60) {
set_com34_addr(dev);
set_serial_addr(dev, 0);
set_serial_addr(dev, 1);
}
break;
case 2:
if (valxor & 7)
set_serial_addr(dev, 0);
if (valxor & 0x70)
set_serial_addr(dev, 1);
break;
case 3:
if (valxor & 2)
fdc_update_enh_mode(dev->fdc, (dev->regs[3] & 2) ? 1 : 0);
break;
case 4:
if (valxor & 0x10)
set_serial_addr(dev, 0);
if (valxor & 0x20)
set_serial_addr(dev, 1);
break;
case 5:
if (valxor & 0x01)
fdc_handler(dev);
if (dev->has_ide && (valxor & 0x02))
ide_handler(dev);
if (valxor & 0x18)
fdc_update_densel_force(dev->fdc, (dev->regs[5] & 0x18) >> 3);
if (valxor & 0x20)
fdc_set_swap(dev->fdc, (dev->regs[5] & 0x20) >> 5);
break;
}
}
} else if ((port == FDC_PRIMARY_ADDR) && (val == 0x55))
dev->tries++;
}
static uint8_t
fdc37c6xx_read(uint16_t port, void *priv)
{
fdc37c6xx_t *dev = (fdc37c6xx_t *) priv;
uint8_t ret = 0x00;
if (dev->tries == 2) {
if (port == 0x3f1)
ret = dev->regs[dev->cur_reg];
}
return ret;
}
static void
fdc37c6xx_reset(fdc37c6xx_t *dev)
{
dev->com3_addr = 0x338;
dev->com4_addr = 0x238;
serial_remove(dev->uart[0]);
serial_setup(dev->uart[0], COM1_ADDR, COM1_IRQ);
serial_remove(dev->uart[1]);
serial_setup(dev->uart[1], COM2_ADDR, COM2_IRQ);
lpt1_remove();
lpt1_init(LPT1_ADDR);
fdc_reset(dev->fdc);
fdc_remove(dev->fdc);
dev->tries = 0;
memset(dev->regs, 0, 16);
switch (dev->chip_id) {
case 0x63: case 0x65:
dev->max_reg = 0x0f;
dev->regs[0x0] = 0x3b;
break;
case 0x64: case 0x66:
dev->max_reg = 0x0f;
dev->regs[0x0] = 0x2b;
break;
default:
dev->max_reg = (dev->chip_id >= 0x61) ? 0x03 : 0x02;
dev->regs[0x0] = 0x3f;
break;
}
dev->regs[0x1] = 0x9f;
dev->regs[0x2] = 0xdc;
dev->regs[0x3] = 0x78;
if (dev->chip_id >= 0x63) {
dev->regs[0x6] = 0xff;
dev->regs[0xd] = dev->chip_id;
if (dev->chip_id >= 0x65)
dev->regs[0xe] = 0x02;
else
dev->regs[0xe] = 0x01;
}
set_serial_addr(dev, 0);
set_serial_addr(dev, 1);
lpt1_handler(dev);
fdc_handler(dev);
if (dev->has_ide)
ide_handler(dev);
}
static void
fdc37c6xx_close(void *priv)
{
fdc37c6xx_t *dev = (fdc37c6xx_t *) priv;
free(dev);
}
static void *
fdc37c6xx_init(const device_t *info)
{
fdc37c6xx_t *dev = (fdc37c6xx_t *) malloc(sizeof(fdc37c6xx_t));
memset(dev, 0, sizeof(fdc37c6xx_t));
dev->fdc = device_add(&fdc_at_smc_device);
dev->chip_id = info->local & 0xff;
dev->has_ide = (info->local >> 8) & 0xff;
if (dev->chip_id >= 0x63) {
dev->uart[0] = device_add_inst(&ns16550_device, 1);
dev->uart[1] = device_add_inst(&ns16550_device, 2);
} else {
dev->uart[0] = device_add_inst(&ns16450_device, 1);
dev->uart[1] = device_add_inst(&ns16450_device, 2);
}
io_sethandler(FDC_PRIMARY_ADDR, 0x0002,
fdc37c6xx_read, NULL, NULL, fdc37c6xx_write, NULL, NULL, dev);
fdc37c6xx_reset(dev);
return dev;
}
/* The three appear to differ only in the chip ID, if I
understood their datasheets correctly. */
const device_t fdc37c651_device = {
.name = "SMC FDC37C651 Super I/O",
.internal_name = "fdc37c651",
.flags = 0,
.local = 0x51,
.init = fdc37c6xx_init,
.close = fdc37c6xx_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
const device_t fdc37c651_ide_device = {
.name = "SMC FDC37C651 Super I/O (With IDE)",
.internal_name = "fdc37c651_ide",
.flags = 0,
.local = 0x151,
.init = fdc37c6xx_init,
.close = fdc37c6xx_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
const device_t fdc37c661_device = {
.name = "SMC FDC37C661 Super I/O",
.internal_name = "fdc37c661",
.flags = 0,
.local = 0x61,
.init = fdc37c6xx_init,
.close = fdc37c6xx_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
const device_t fdc37c661_ide_device = {
.name = "SMC FDC37C661 Super I/O (With IDE)",
.internal_name = "fdc37c661_ide",
.flags = 0,
.local = 0x161,
.init = fdc37c6xx_init,
.close = fdc37c6xx_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
const device_t fdc37c663_device = {
.name = "SMC FDC37C663 Super I/O",
.internal_name = "fdc37c663",
.flags = 0,
.local = 0x63,
.init = fdc37c6xx_init,
.close = fdc37c6xx_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
const device_t fdc37c663_ide_device = {
.name = "SMC FDC37C663 Super I/O (With IDE)",
.internal_name = "fdc37c663_ide",
.flags = 0,
.local = 0x163,
.init = fdc37c6xx_init,
.close = fdc37c6xx_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
const device_t fdc37c665_device = {
.name = "SMC FDC37C665 Super I/O",
.internal_name = "fdc37c665",
.flags = 0,
.local = 0x65,
.init = fdc37c6xx_init,
.close = fdc37c6xx_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
const device_t fdc37c665_ide_device = {
.name = "SMC FDC37C665 Super I/O (With IDE)",
.internal_name = "fdc37c665_ide",
.flags = 0,
.local = 0x265,
.init = fdc37c6xx_init,
.close = fdc37c6xx_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
const device_t fdc37c666_device = {
.name = "SMC FDC37C666 Super I/O",
.internal_name = "fdc37c666",
.flags = 0,
.local = 0x66,
.init = fdc37c6xx_init,
.close = fdc37c6xx_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};