dingusppc/devices/common/pci/bandit.cpp
2022-05-21 14:51:27 +02:00

225 lines
7.5 KiB
C++

/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** Bandit ARBus-to-PCI Bridge emulation. */
#include "bandit.h"
#include <devices/memctrl/memctrlbase.h>
#include <endianswap.h>
#include <loguru.hpp>
#include <machines/machinebase.h>
#include <memaccess.h>
#include <cinttypes>
Bandit::Bandit(int bridge_num, std::string name) : PCIHost(), PCIDevice(name)
{
this->base_addr = 0xF0000000 + ((bridge_num & 3) << 25);
MemCtrlBase *mem_ctrl = dynamic_cast<MemCtrlBase *>
(gMachineObj->get_comp_by_type(HWCompType::MEM_CTRL));
// add memory mapped I/O region for Bandit control registers
// This region has the following layout:
// base_addr + 0x000000 --> I/O space
// base_addr + 0x800000 --> CONFIG_ADDR
// base_addr + 0xC00000 --> CONFIG_DATA
// base_addr + 0x1000000 --> pass-through memory space (not included below)
mem_ctrl->add_mmio_region(base_addr, 0x01000000, this);
// prepare the PCI config header
this->vendor_id = PCI_VENDOR_APPLE;
this->device_id = 0x0001;
this->class_rev = 0x06000003;
this->cache_ln_sz = 8;
this->command = 0x16;
// make several PCI config space registers read-only
this->pci_wr_cmd = [](uint16_t cmd) {}; // command register
this->pci_wr_cache_lnsz = [](uint8_t val) {}; // cache line size register
}
uint32_t Bandit::pci_cfg_read(uint32_t reg_offs, uint32_t size)
{
if (reg_offs < 64) {
return PCIDevice::pci_cfg_read(reg_offs, size);
}
switch (reg_offs) {
case BANDIT_ADDR_MASK:
return BYTESWAP_32(this->addr_mask);
default:
LOG_F(WARNING, "%s: reading from unimplemented config register at 0x%X",
this->pci_name.c_str(), reg_offs);
}
return 0;
}
void Bandit::pci_cfg_write(uint32_t reg_offs, uint32_t value, uint32_t size)
{
if (reg_offs < 64) {
PCIDevice::pci_cfg_write(reg_offs, value, size);
return;
}
switch (reg_offs) {
case BANDIT_ADDR_MASK:
this->addr_mask = BYTESWAP_32(value);
this->verbose_address_space();
break;
default:
LOG_F(WARNING, "%s: writing to unimplemented config register at 0x%X",
this->pci_name.c_str(), reg_offs);
}
}
uint32_t Bandit::read(uint32_t reg_start, uint32_t offset, int size)
{
int fun_num;
uint8_t reg_offs;
uint32_t result, idsel;
if (offset & BANDIT_CONFIG_SPACE) {
if (offset & 0x00400000) {
// access to the CONFIG_DATA pseudo-register causes a Config Cycle
if (this->config_addr & BANDIT_CAR_TYPE) {
LOG_F(WARNING, "%s: config cycle type 1 not supported yet", this->name.c_str());
return 0;
}
idsel = (this->config_addr >> 11) & 0x1FFFFFU;
fun_num = (this->config_addr >> 8) & 7;
reg_offs = this->config_addr & 0xFCU;
if (!SINGLE_BIT_SET(idsel)) {
LOG_F(ERROR, "%s: invalid IDSEL=0x%X passed", this->name.c_str(), idsel);
return 0;
}
if (idsel == BANDIT_ID_SEL) { // access to myself
result = this->pci_cfg_read(reg_offs, size);
} else {
if (this->dev_map.count(idsel)) {
result = this->dev_map[idsel]->pci_cfg_read(reg_offs, size);
} else {
LOG_F(
ERROR,
"%s err: read attempt from non-existing PCI device %d \n",
this->name.c_str(),
idsel);
result = 0;
}
}
} else {
result = this->config_addr;
}
} else { // I/O space access
// broadcast I/O request to devices that support I/O space
// until a device returns true that means "request accepted"
for (auto& dev : this->io_space_devs) {
if (dev->pci_io_read(offset, size, &result)) {
return result;
}
}
LOG_F(ERROR, "%s: attempt to read from unmapped PCI I/O space, offset=0x%X",
this->name.c_str(), offset);
}
return result;
}
void Bandit::write(uint32_t reg_start, uint32_t offset, uint32_t value, int size)
{
int fun_num;
uint8_t reg_offs;
uint32_t idsel;
if (offset & BANDIT_CONFIG_SPACE) {
if (offset & 0x00400000) {
// access to the CONFIG_DATA pseudo-register causes a Config Cycle
if (this->config_addr & BANDIT_CAR_TYPE) {
LOG_F(WARNING, "%s: config cycle type 1 not supported yet", this->name.c_str());
return;
}
idsel = (this->config_addr >> 11) & 0x1FFFFFU;
fun_num = (this->config_addr >> 8) & 7;
reg_offs = this->config_addr & 0xFCU;
if (!SINGLE_BIT_SET(idsel)) {
LOG_F(ERROR, "%s: invalid IDSEL=0x%X passed", this->name.c_str(), idsel);
return;
}
if (idsel == BANDIT_ID_SEL) { // access to myself
this->pci_cfg_write(reg_offs, value, size);
return;
}
if (this->dev_map.count(idsel)) {
this->dev_map[idsel]->pci_cfg_write(reg_offs, value, size);
} else {
LOG_F(
ERROR,
"%s err: write attempt to non-existing PCI device %d \n",
this->name.c_str(),
idsel);
}
} else {
this->config_addr = BYTESWAP_32(value);
}
} else { // I/O space access
// broadcast I/O request to devices that support I/O space
// until a device returns true that means "request accepted"
for (auto& dev : this->io_space_devs) {
if (dev->pci_io_write(offset, value, size)) {
return;
}
}
LOG_F(ERROR, "%s: attempt to write to unmapped PCI I/O space, offset=0x%X",
this->name.c_str(), offset);
}
}
void Bandit::verbose_address_space()
{
uint32_t mask;
int bit_pos;
LOG_F(INFO, "%s address spaces:", this->pci_name.c_str());
// verbose coarse aka 256MB memory regions
for (mask = 0x10000, bit_pos = 0; mask != 0x80000000UL; mask <<= 1, bit_pos++) {
if (this->addr_mask & mask) {
uint32_t start_addr = bit_pos << 28;
LOG_F(INFO, "- 0x%X ... 0x%X", start_addr, start_addr + 0x0FFFFFFFU);
}
}
// verbose fine aka 16MB memory regions
for (mask = 0x1, bit_pos = 0; mask != 0x10000UL; mask <<= 1, bit_pos++) {
if (this->addr_mask & mask) {
uint32_t start_addr = (bit_pos << 24) + 0xF0000000UL;
LOG_F(INFO, "- 0x%X ... 0x%X", start_addr, start_addr + 0x00FFFFFFU);
}
}
}