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86Box/src/sio/sio_pc87306.c
Jasmine Iwanek 859d06b608 More linting in src/sio
2023-08-23 00:18:16 -04:00

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/*
* 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.
*
* Emulation of the NatSemi PC87306 Super I/O chip.
*
*
*
* Authors: Miran Grca, <mgrca8@gmail.com>
*
* Copyright 2016-2018 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/lpt.h>
#include <86box/mem.h>
#include <86box/nvr.h>
#include <86box/pci.h>
#include <86box/rom.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>
#include <86box/plat_unused.h>
typedef struct pc87306_t {
uint8_t tries;
uint8_t regs[29];
uint8_t gpio[2];
int cur_reg;
fdc_t *fdc;
serial_t *uart[2];
nvr_t *nvr;
} pc87306_t;
static void
pc87306_gpio_write(uint16_t port, uint8_t val, void *priv)
{
pc87306_t *dev = (pc87306_t *) priv;
dev->gpio[port & 1] = val;
}
uint8_t
pc87306_gpio_read(uint16_t port, void *priv)
{
const pc87306_t *dev = (pc87306_t *) priv;
return dev->gpio[port & 1];
}
static void
pc87306_gpio_remove(pc87306_t *dev)
{
io_removehandler(dev->regs[0x0f] << 2, 0x0001,
pc87306_gpio_read, NULL, NULL, pc87306_gpio_write, NULL, NULL, dev);
io_removehandler((dev->regs[0x0f] << 2) + 1, 0x0001,
pc87306_gpio_read, NULL, NULL, pc87306_gpio_write, NULL, NULL, dev);
}
static void
pc87306_gpio_init(pc87306_t *dev)
{
if ((dev->regs[0x12]) & 0x10)
io_sethandler(dev->regs[0x0f] << 2, 0x0001,
pc87306_gpio_read, NULL, NULL, pc87306_gpio_write, NULL, NULL, dev);
if ((dev->regs[0x12]) & 0x20)
io_sethandler((dev->regs[0x0f] << 2) + 1, 0x0001,
pc87306_gpio_read, NULL, NULL, pc87306_gpio_write, NULL, NULL, dev);
}
static void
lpt1_handler(pc87306_t *dev)
{
int temp;
uint16_t lptba;
uint16_t lpt_port = LPT1_ADDR;
uint8_t lpt_irq = LPT2_IRQ;
temp = dev->regs[0x01] & 3;
lptba = ((uint16_t) dev->regs[0x19]) << 2;
switch (temp) {
case 0:
lpt_port = LPT1_ADDR;
lpt_irq = (dev->regs[0x02] & 0x08) ? LPT1_IRQ : LPT2_IRQ;
break;
case 1:
if (dev->regs[0x1b] & 0x40)
lpt_port = lptba;
else
lpt_port = LPT_MDA_ADDR;
lpt_irq = LPT_MDA_IRQ;
break;
case 2:
lpt_port = LPT2_ADDR;
lpt_irq = LPT2_IRQ;
break;
case 3:
lpt_port = 0x000;
lpt_irq = 0xff;
break;
default:
break;
}
if (dev->regs[0x1b] & 0x10)
lpt_irq = (dev->regs[0x1b] & 0x20) ? 7 : 5;
if (lpt_port)
lpt1_init(lpt_port);
lpt1_irq(lpt_irq);
}
static void
serial_handler(pc87306_t *dev, int uart)
{
int temp;
uint8_t fer_irq;
uint8_t pnp1_irq;
uint8_t fer_shift;
uint8_t pnp_shift;
uint8_t irq;
temp = (dev->regs[1] >> (2 << uart)) & 3;
fer_shift = 2 << uart; /* 2 for UART 1, 4 for UART 2 */
pnp_shift = 2 + (uart << 2); /* 2 for UART 1, 6 for UART 2 */
/* 0 = COM1 (IRQ 4), 1 = COM2 (IRQ 3), 2 = COM3 (IRQ 4), 3 = COM4 (IRQ 3) */
fer_irq = ((dev->regs[1] >> fer_shift) & 1) ? 3 : 4;
pnp1_irq = ((dev->regs[0x1c] >> pnp_shift) & 1) ? 4 : 3;
irq = (dev->regs[0x1c] & 1) ? pnp1_irq : fer_irq;
switch (temp) {
case 0:
serial_setup(dev->uart[uart], COM1_ADDR, irq);
break;
case 1:
serial_setup(dev->uart[uart], COM2_ADDR, irq);
break;
case 2:
switch ((dev->regs[1] >> 6) & 3) {
case 0:
serial_setup(dev->uart[uart], COM3_ADDR, irq);
break;
case 1:
serial_setup(dev->uart[uart], 0x338, irq);
break;
case 2:
serial_setup(dev->uart[uart], COM4_ADDR, irq);
break;
case 3:
serial_setup(dev->uart[uart], 0x220, irq);
break;
default:
break;
}
break;
case 3:
switch ((dev->regs[1] >> 6) & 3) {
case 0:
serial_setup(dev->uart[uart], COM4_ADDR, irq);
break;
case 1:
serial_setup(dev->uart[uart], 0x238, irq);
break;
case 2:
serial_setup(dev->uart[uart], 0x2e0, irq);
break;
case 3:
serial_setup(dev->uart[uart], 0x228, irq);
break;
default:
break;
}
break;
default:
break;
}
}
static void
pc87306_write(uint16_t port, uint8_t val, void *priv)
{
pc87306_t *dev = (pc87306_t *) priv;
uint8_t index;
uint8_t valxor;
index = (port & 1) ? 0 : 1;
if (index) {
dev->cur_reg = val & 0x1f;
dev->tries = 0;
return;
} else {
if (dev->tries) {
if ((dev->cur_reg == 0) && (val == 8))
val = 0x4b;
valxor = val ^ dev->regs[dev->cur_reg];
dev->tries = 0;
if ((dev->cur_reg <= 28) && (dev->cur_reg != 8)) {
if (dev->cur_reg == 0)
val &= 0x5f;
if (((dev->cur_reg == 0x0F) || (dev->cur_reg == 0x12)) && valxor)
pc87306_gpio_remove(dev);
dev->regs[dev->cur_reg] = val;
} else
return;
} else {
dev->tries++;
return;
}
}
switch (dev->cur_reg) {
case 0:
if (valxor & 1) {
lpt1_remove();
if ((val & 1) && !(dev->regs[2] & 1))
lpt1_handler(dev);
}
if (valxor & 2) {
serial_remove(dev->uart[0]);
if ((val & 2) && !(dev->regs[2] & 1))
serial_handler(dev, 0);
}
if (valxor & 4) {
serial_remove(dev->uart[1]);
if ((val & 4) && !(dev->regs[2] & 1))
serial_handler(dev, 1);
}
if (valxor & 0x28) {
fdc_remove(dev->fdc);
if ((val & 8) && !(dev->regs[2] & 1))
fdc_set_base(dev->fdc, (val & 0x20) ? FDC_SECONDARY_ADDR : FDC_PRIMARY_ADDR);
}
break;
case 1:
if (valxor & 3) {
lpt1_remove();
if ((dev->regs[0] & 1) && !(dev->regs[2] & 1))
lpt1_handler(dev);
}
if (valxor & 0xcc) {
serial_remove(dev->uart[0]);
if ((dev->regs[0] & 2) && !(dev->regs[2] & 1))
serial_handler(dev, 0);
}
if (valxor & 0xf0) {
serial_remove(dev->uart[1]);
if ((dev->regs[0] & 4) && !(dev->regs[2] & 1))
serial_handler(dev, 1);
}
break;
case 2:
if (valxor & 1) {
lpt1_remove();
serial_remove(dev->uart[0]);
serial_remove(dev->uart[1]);
fdc_remove(dev->fdc);
if (!(val & 1)) {
if (dev->regs[0] & 1)
lpt1_handler(dev);
if (dev->regs[0] & 2)
serial_handler(dev, 0);
if (dev->regs[0] & 4)
serial_handler(dev, 1);
if (dev->regs[0] & 8)
fdc_set_base(dev->fdc, (dev->regs[0] & 0x20) ? FDC_SECONDARY_ADDR : FDC_PRIMARY_ADDR);
}
}
if (valxor & 8) {
lpt1_remove();
if ((dev->regs[0] & 1) && !(dev->regs[2] & 1))
lpt1_handler(dev);
}
break;
case 4:
if (valxor & 0x80)
nvr_lock_set(0x00, 256, !!(val & 0x80), dev->nvr);
break;
case 5:
if (valxor & 0x08)
nvr_at_handler(!!(val & 0x08), 0x0070, dev->nvr);
if (valxor & 0x20)
nvr_bank_set(0, !!(val & 0x20), dev->nvr);
break;
case 9:
if (valxor & 0x44) {
fdc_update_enh_mode(dev->fdc, (val & 4) ? 1 : 0);
fdc_update_densel_polarity(dev->fdc, (val & 0x40) ? 1 : 0);
}
break;
case 0xF:
if (valxor)
pc87306_gpio_init(dev);
break;
case 0x12:
if (valxor & 0x01)
nvr_wp_set(!!(val & 0x01), 0, dev->nvr);
if (valxor & 0x30)
pc87306_gpio_init(dev);
break;
case 0x19:
if (valxor) {
lpt1_remove();
if ((dev->regs[0] & 1) && !(dev->regs[2] & 1))
lpt1_handler(dev);
}
break;
case 0x1B:
if (valxor & 0x70) {
lpt1_remove();
if (!(val & 0x40))
dev->regs[0x19] = 0xEF;
if ((dev->regs[0] & 1) && !(dev->regs[2] & 1))
lpt1_handler(dev);
}
break;
case 0x1C:
if (valxor) {
serial_remove(dev->uart[0]);
serial_remove(dev->uart[1]);
if ((dev->regs[0] & 2) && !(dev->regs[2] & 1))
serial_handler(dev, 0);
if ((dev->regs[0] & 4) && !(dev->regs[2] & 1))
serial_handler(dev, 1);
}
break;
default:
break;
}
}
uint8_t
pc87306_read(uint16_t port, void *priv)
{
pc87306_t *dev = (pc87306_t *) priv;
uint8_t ret = 0xff;
uint8_t index;
index = (port & 1) ? 0 : 1;
dev->tries = 0;
if (index)
ret = dev->cur_reg & 0x1f;
else {
if (dev->cur_reg == 8)
ret = 0x70;
else if (dev->cur_reg < 28)
ret = dev->regs[dev->cur_reg];
}
return ret;
}
void
pc87306_reset(void *priv)
{
pc87306_t *dev = (pc87306_t *) priv;
memset(dev->regs, 0, 29);
dev->regs[0x00] = 0x0B;
dev->regs[0x01] = 0x01;
dev->regs[0x03] = 0x01;
dev->regs[0x05] = 0x0D;
dev->regs[0x08] = 0x70;
dev->regs[0x09] = 0xC0;
dev->regs[0x0b] = 0x80;
dev->regs[0x0f] = 0x1E;
dev->regs[0x12] = 0x30;
dev->regs[0x19] = 0xEF;
dev->gpio[0] = 0xff;
dev->gpio[1] = 0xfb;
/*
0 = 360 rpm @ 500 kbps for 3.5"
1 = Default, 300 rpm @ 500, 300, 250, 1000 kbps for 3.5"
*/
lpt1_remove();
lpt1_handler(dev);
serial_remove(dev->uart[0]);
serial_remove(dev->uart[1]);
serial_handler(dev, 0);
serial_handler(dev, 1);
fdc_reset(dev->fdc);
pc87306_gpio_init(dev);
nvr_lock_set(0x00, 256, 0, dev->nvr);
nvr_at_handler(1, 0x0070, dev->nvr);
nvr_bank_set(0, 0, dev->nvr);
nvr_wp_set(0, 0, dev->nvr);
}
static void
pc87306_close(void *priv)
{
pc87306_t *dev = (pc87306_t *) priv;
free(dev);
}
static void *
pc87306_init(UNUSED(const device_t *info))
{
pc87306_t *dev = (pc87306_t *) malloc(sizeof(pc87306_t));
memset(dev, 0, sizeof(pc87306_t));
dev->fdc = device_add(&fdc_at_nsc_device);
dev->uart[0] = device_add_inst(&ns16550_device, 1);
dev->uart[1] = device_add_inst(&ns16550_device, 2);
dev->nvr = device_add(&at_mb_nvr_device);
pc87306_reset(dev);
io_sethandler(0x02e, 0x0002,
pc87306_read, NULL, NULL, pc87306_write, NULL, NULL, dev);
return dev;
}
const device_t pc87306_device = {
.name = "National Semiconductor PC87306 Super I/O",
.internal_name = "pc87306",
.flags = 0,
.local = 0,
.init = pc87306_init,
.close = pc87306_close,
.reset = pc87306_reset,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
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