Initial DEC 21154 P2P bridge emulation.

devices/common/pci/dec21154.cpp

@@ -0,0 +1,94 @@
+/*
+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/>.
+*/
+
+/** DEC 21154 PCI-to-PCI bridge emulation. */
+
+#include <devices/common/hwcomponent.h>
+#include <devices/common/pci/dec21154.h>
+#include <devices/deviceregistry.h>
+#include <endianswap.h>
+#include <loguru.hpp>
+
+#include <cinttypes>
+
+DecPciBridge::DecPciBridge(std::string name) : PCIBridge(name)
+{
+    supports_types(HWCompType::PCI_HOST | HWCompType::PCI_DEV);
+
+    // initialize PCI config header
+    this->vendor_id   = PCI_VENDOR_DEC;
+    this->device_id   = 0x0026;
+    this->class_rev   = 0x06040002;
+    this->cache_ln_sz = 0;
+    this->command     = 0;
+    this->status      = 0x2B0;
+}
+
+uint32_t DecPciBridge::pci_cfg_read(uint32_t reg_offs, AccessDetails &details)
+{
+    if (reg_offs < 64) {
+        return PCIBridge::pci_cfg_read(reg_offs, details);
+    }
+
+    switch (reg_offs) {
+    case CHIP_CTRL:
+        return (this->arb_ctrl << 16) | (this-> diag_ctrl << 8) | this->chip_ctrl;
+    case PSERR_EVENT_DIS:
+        return (this->gpio_out_en << 16) | this->pserr_event_dis;
+    case SEC_CLK_CTRL:
+        return this->sec_clock_ctrl;
+    default:
+        LOG_READ_UNIMPLEMENTED_CONFIG_REGISTER();
+    }
+
+    return 0;
+}
+
+void DecPciBridge::pci_cfg_write(uint32_t reg_offs, uint32_t value, AccessDetails &details)
+{
+    if (reg_offs < 64) {
+        PCIBridge::pci_cfg_write(reg_offs, value, details);
+        return;
+    }
+
+    switch (reg_offs) {
+    case CHIP_CTRL:
+        this->chip_ctrl =  value & 0xFFU;
+        this->diag_ctrl = (value >> 8) & 0xFFU;
+        this->arb_ctrl  =  value >> 16;
+        break;
+    case PSERR_EVENT_DIS:
+        this->pserr_event_dis =  value & 0xFFU;
+        this->gpio_out_en     = (value >> 16) & 0xFFU;
+        break;
+    case SEC_CLK_CTRL:
+        this->sec_clock_ctrl = value & 0xFFFFU;
+        break;
+    default:
+        LOG_WRITE_UNIMPLEMENTED_CONFIG_REGISTER();
+    }
+}
+
+static const DeviceDescription Dec21154_Descriptor = {
+    DecPciBridge::create, {}, {}
+};
+
+REGISTER_DEVICE(Dec21154, Dec21154_Descriptor);

devices/common/pci/dec21154.h

@@ -0,0 +1,62 @@
+/*
+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/>.
+*/
+
+/** DEC 21154 PCI-to-PCI bridge definitions. */
+
+#ifndef DEC_P2P_H
+#define DEC_P2P_H
+
+#include <devices/common/pci/pcibridge.h>
+
+#include <cinttypes>
+#include <string>
+
+enum {
+    CHIP_CTRL           = 0x40,
+    PSERR_EVENT_DIS     = 0x64,
+    SEC_CLK_CTRL        = 0x68,
+};
+
+class DecPciBridge : public PCIBridge {
+public:
+    DecPciBridge(std::string name);
+    ~DecPciBridge() = default;
+
+    static std::unique_ptr<HWComponent> create() {
+        return std::unique_ptr<DecPciBridge>(new DecPciBridge("DEC21154"));
+    }
+
+    // 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);
+
+private:
+    uint8_t     chip_ctrl           = 0;
+    uint8_t     diag_ctrl           = 0;
+    uint16_t    arb_ctrl            = 0x0200;
+    uint8_t     pserr_event_dis     = 0;
+    uint8_t     gpio_out_data       = 0;
+    uint8_t     gpio_out_en         = 0;
+    uint8_t     gpio_in_data        = 0;
+    uint16_t    sec_clock_ctrl      = 0;
+};
+
+#endif // DEC_P2P_H

devices/common/pci/pcidevice.h

@@ -54,6 +54,7 @@ enum {
 /** PCI Vendor IDs for devices used in Power Macintosh computers. */
 enum {
     PCI_VENDOR_ATI      = 0x1002,
+    PCI_VENDOR_DEC      = 0x1011,
     PCI_VENDOR_MOTOROLA = 0x1057,
     PCI_VENDOR_APPLE    = 0x106B,
     PCI_VENDOR_NVIDIA   = 0x10DE,

devices/common/pci/pcihost.h

@@ -26,6 +26,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <devices/deviceregistry.h>
 #include <endianswap.h>
 
+#include <array>
 #include <cinttypes>
 #include <string>
 #include <unordered_map>
@@ -78,6 +79,13 @@ public:
 
     virtual PCIDevice *pci_find_device(uint8_t bus_num, uint8_t dev_num, uint8_t fun_num);
 
+    virtual uint32_t pci_t1_read(uint8_t dev, uint32_t fun, uint32_t reg, AccessDetails &details) {
+        return 0;
+    };
+
+    virtual void pci_t1_write(uint8_t dev, uint32_t fun, uint32_t reg, uint32_t value,
+        AccessDetails &details) {};
+
 protected:
     std::unordered_map<int, PCIDevice*> dev_map;
     std::vector<PCIDevice*>             io_space_devs;