mirror of
https://github.com/dingusdev/dingusppc.git
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126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-23 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file BigMac Ethernet controller definitions. */
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#ifndef BIG_MAC_H
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#define BIG_MAC_H
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#include <devices/common/hwcomponent.h>
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#include <cinttypes>
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#include <memory>
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/* Ethernet cell IDs for various MacIO ASICs. */
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enum EthernetCellId : uint8_t {
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Heathrow = 0xB1,
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Paddington = 0xC7,
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};
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/* BigMac HW registers. */
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enum BigMacReg : uint16_t {
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CHIP_ID = 0x170,
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MIF_CSR = 0x180,
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};
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/* MIF_CSR bit definitions. */
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enum {
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Mif_Clock = 1 << 0,
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Mif_Data_Out = 1 << 1,
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Mif_Data_Out_En = 1 << 2,
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Mif_Data_In = 1 << 3
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};
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/* MII frame states. */
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enum MII_FRAME_SM {
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Preamble,
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Start,
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Opcode,
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Phy_Address,
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Reg_Address,
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Turnaround,
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Read_Data,
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Write_Data,
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Stop
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};
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/* PHY control/status registers. */
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enum {
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PHY_BMCR = 0,
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PHY_ID1 = 2,
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PHY_ID2 = 3,
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PHY_ANAR = 4,
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};
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class BigMac : public HWComponent {
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public:
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BigMac(uint8_t id);
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~BigMac() = default;
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static std::unique_ptr<HWComponent> create_for_heathrow() {
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return std::unique_ptr<BigMac>(new BigMac(EthernetCellId::Heathrow));
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}
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static std::unique_ptr<HWComponent> create_for_paddington() {
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return std::unique_ptr<BigMac>(new BigMac(EthernetCellId::Paddington));
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}
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// BigMac register accessors
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uint16_t read(uint16_t reg_offset);
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void write(uint16_t reg_offset, uint16_t value);
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// MII methods
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bool mii_rcv_value(uint16_t& var, uint8_t num_bits, uint8_t next_bit);
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void mii_rcv_bit();
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void mii_xmit_bit(const uint8_t bit_val);
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void mii_reset();
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// PHY control/status methods
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void phy_reset();
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uint16_t phy_reg_read(uint8_t reg_num);
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void phy_reg_write(uint8_t reg_num, uint16_t value);
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private:
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uint8_t chip_id; // BigMac Chip ID
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// MII state
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uint8_t mif_csr_old = 0;
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uint8_t mii_bit_counter = 0;
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uint16_t mii_start = 0;
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uint16_t mii_stop = 0;
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uint16_t mii_opcode = 0;
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uint16_t mii_phy_address = 0;
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uint16_t mii_reg_address = 0;
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uint16_t mii_turnaround = 0;
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uint16_t mii_data = 0;
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uint8_t mii_in_bit = 1;
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MII_FRAME_SM mii_state = MII_FRAME_SM::Preamble;
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// PHY state
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uint32_t phy_oui;
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uint8_t phy_model;
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uint8_t phy_rev;
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uint16_t phy_bmcr;
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uint16_t phy_anar;
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};
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#endif // BIG_MAC_H
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