dingusppc/devices/common/pci/bandit.h
2023-02-08 11:41:37 +01:00

142 lines
4.3 KiB
C++

/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-23 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/Chaos ARBus-to-PCI bridge definitions.
Bandit is a custom ARBus-to-PCI bridge used in the second generation
of the Power Macintosh computer equipped with the PCI bus.
Chaos is a custom ARBus-to-PCI bridge that provides a specialized
PCI-like bus for video called VCI. This 64-bit bus runs at the same
frequency as the CPU bus (40-50 MHz) and connects video input/output
devices with the CPU bus.
Chaos seems to be a Bandit variant without PCI configuration space.
It's assumed to be present in some PCI Power Macintosh models of the
first generation.
*/
#ifndef BANDIT_PCI_H
#define BANDIT_PCI_H
#include <devices/common/hwcomponent.h>
#include <devices/common/mmiodevice.h>
#include <devices/common/pci/pcidevice.h>
#include <devices/common/pci/pcihost.h>
#include <cinttypes>
#include <memory>
#include <string>
#define BANDIT_DEV (11) // Bandit's own device number
#define BANDIT_CAR_TYPE (1 << 0) // Bandit config address type bit
/* Convenient macros for parsing CONFIG_ADDR fields. */
#define BUS_NUM() ((this->config_addr >> 16) & 0xFFU)
#define DEV_NUM() ((this->config_addr >> 11) & 0x1FU)
#define FUN_NUM() ((this->config_addr >> 8) & 0x07U)
#define REG_NUM() ((this->config_addr ) & 0xFCU)
/** Bandit specific configuration registers. */
enum {
BANDIT_ADDR_MASK = 0x48,
BANDIT_MODE_SELECT = 0x50,
BANDIT_ARBUS_RD_HOLD_OFF = 0x58,
};
/** checks if one bit is set at time, return 0 if not */
#define SINGLE_BIT_SET(val) ((val) && !((val) & ((val)-1)))
/*
Common functionality for Bandit/Chaos PCI host bridge.
*/
class BanditHost : public PCIHost, public MMIODevice {
public:
// MMIODevice methods
uint32_t read(uint32_t rgn_start, uint32_t offset, int size);
void write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size);
protected:
uint32_t config_addr;
private:
void cfg_setup(uint32_t offset, int size, int &bus_num, int &dev_num,
int &fun_num, uint8_t &reg_offs, AccessDetails &details,
PCIDevice *&device);
};
/*
PCI device for Bandit (but not for Chaos).
*/
class BanditPciDevice : public PCIDevice {
public:
BanditPciDevice(int bridge_num, std::string name, int dev_id, int rev);
~BanditPciDevice() = default;
// PCIDevice methods
uint32_t pci_cfg_read(uint32_t reg_offs, AccessDetails &details);
void pci_cfg_write(uint32_t reg_offs, uint32_t value, AccessDetails &details);
protected:
void verbose_address_space();
private:
uint32_t addr_mask;
uint32_t mode_ctrl; // controls various chip modes/features
uint32_t rd_hold_off_cnt;
};
/*
Bandit HLE emulation class.
*/
class Bandit : public BanditHost {
public:
Bandit(int bridge_num, std::string name, int dev_id=1, int rev=3);
~Bandit() = default;
static std::unique_ptr<HWComponent> create_first() {
return std::unique_ptr<Bandit>(new Bandit(1, "Bandit-PCI1"));
};
static std::unique_ptr<HWComponent> create_psx_first() {
return std::unique_ptr<Bandit>(new Bandit(1, "PSX-PCI1", 8, 0));
};
private:
uint32_t base_addr;
unique_ptr<BanditPciDevice> my_pci_device;
};
/**
Chaos HLE emulation class.
*/
class Chaos : public BanditHost {
public:
Chaos(std::string name);
~Chaos() = default;
static std::unique_ptr<HWComponent> create() {
return std::unique_ptr<Chaos>(new Chaos("VCI0"));
};
};
#endif // BANDIT_PCI_H