// license:BSD-3-Clause // copyright-holders:Fabio Priuli /*************************************************************************** Konami IC 033906 (PCI bridge) ***************************************************************************/ #include "emu.h" #include "k033906.h" //************************************************************************** // LIVE DEVICE //************************************************************************** // device type definition DEFINE_DEVICE_TYPE(K033906, k033906_device, "k033906", "K033906 PCI bridge") //------------------------------------------------- // k033906_device - constructor //------------------------------------------------- k033906_device::k033906_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, K033906, tag, owner, clock) , m_reg_set(0) , m_voodoo(*this, finder_base::DUMMY_TAG) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void k033906_device::device_start() { m_reg_set = 0; save_item(NAME(m_reg)); save_item(NAME(m_ram)); save_item(NAME(m_reg_set)); } WRITE_LINE_MEMBER(k033906_device::set_reg) { m_reg_set = state & 1; } uint32_t k033906_device::reg_r(int reg) { switch (reg) { case 0x00: return 0x0001121a; // PCI Vendor ID (0x121a = 3dfx), Device ID (0x0001 = Voodoo) case 0x02: return 0x04000000; // Revision ID case 0x04: return m_reg[0x04]; // memBaseAddr case 0x0f: return m_reg[0x0f]; // interrupt_line, interrupt_pin, min_gnt, max_lat default: fatalerror("%s: k033906_reg_r: %08X\n", machine().describe_context().c_str(), reg); } // never executed //return 0; } void k033906_device::reg_w(int reg, uint32_t data) { switch (reg) { case 0x00: break; case 0x01: // command register break; case 0x04: // memBaseAddr { if (data == 0xffffffff) { m_reg[0x04] = 0xff000000; } else { m_reg[0x04] = data & 0xff000000; } break; } case 0x0f: // interrupt_line, interrupt_pin, min_gnt, max_lat { m_reg[0x0f] = data; break; } case 0x10: // initEnable { m_voodoo->voodoo_set_init_enable(data); break; } case 0x11: // busSnoop0 case 0x12: // busSnoop1 break; case 0x38: // ??? break; default: fatalerror("%s:K033906_w: %08X, %08X\n", machine().describe_context().c_str(), data, reg); } } READ32_MEMBER(k033906_device::read) { if (m_reg_set) return reg_r(offset); else return m_ram[offset]; } WRITE32_MEMBER(k033906_device::write) { if (m_reg_set) reg_w(offset, data); else m_ram[offset] = data; }