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dingusppc/devices/common/scsi/sc53c94.h

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-24 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/>.
*/
/** @file NCR53C94/Am53CF94 SCSI controller definitions. */
/* NOTE: Power Macintosh computers don't have a real NCR 53C94 chip.
The corresponding functionality is provided by the 53CF94 compatible
cell in the custom Curio IC (Am79C950).
*/
#ifndef SC_53C94_H
#define SC_53C94_H
#include <devices/common/scsi/scsi.h>
#include <devices/common/dbdma.h>
#include <cinttypes>
#include <functional>
#include <memory>
class InterruptCtrl;
/** 53C94 read registers */
namespace Read {
enum Reg53C94 : uint8_t {
Xfer_Cnt_LSB = 0, // Current Transfer Count Register LSB
Xfer_Cnt_MSB = 1, // Current Transfer Count Register MSB
FIFO = 2, // FIFO Register
Command = 3, // Command Register
Status = 4, // Status Register
Int_Status = 5, // Interrupt Status Register
Seq_Step = 6, // Internal State Register
FIFO_Flags = 7, // Current FIFO/Internal State Register
Config_1 = 8, // Control Register 1
//
//
Config_2 = 0xB, // Control Register 2
Config_3 = 0xC, // Control Register 3
Config_4 = 0xD, // Control Register 4
Xfer_Cnt_Hi = 0xE, // Current Transfer Count Register High ; Am53CF94 extension
//
};
};
/** 53C94 write registers */
namespace Write {
enum Reg53C94 : uint8_t {
Xfer_Cnt_LSB = 0, // Start Transfer Count Register LSB
Xfer_Cnt_MSB = 1, // Start Transfer Count Register MSB
FIFO = 2, // FIFO Register
Command = 3, // Command Register
Dest_Bus_ID = 4, // SCSI Destination ID Register (DID)
Sel_Timeout = 5, // SCSI Timeout Register
Sync_Period = 6, // Synchronous Transfer Period Register
Sync_Offset = 7, // Synchronous Offset Register
Config_1 = 8, // Control Register 1
Clock_Factor = 9, // Clock Factor Register
Test_Mode = 0xA, // Forced Test Mode Register
Config_2 = 0xB, // Control Register 2
Config_3 = 0xC, // Control Register 3
Config_4 = 0xD, // Control Register 4 ; Am53CF94 extension
Xfer_Cnt_Hi = 0xE, // Start Transfer Count Register High ; Am53CF94 extension
Data_Align = 0xF, // Data Alignment Register
};
};
/** NCR53C94/Am53CF94 commands. */
enum {
// General Commands
CMD_NOP = 0x00, // no interrupt
CMD_CLEAR_FIFO = 0x01, // no interrupt
CMD_RESET_DEVICE = 0x02, // no interrupt
CMD_RESET_BUS = 0x03,
// Initiator commands
CMD_XFER = 0x10,
CMD_COMPLETE_STEPS = 0x11,
CMD_MSG_ACCEPTED = 0x12,
//CMD_TRANSFER_PAD_BYTES = 0x18,
CMD_SET_ATN = 0x1A, // no interrupt
//CMD_RESET_ATN = 0x1B, // no interrupt
// Target commands
//CMD_SEND_MESSAGE = 0x20,
//CMD_SEND_STATUS = 0x21,
//CMD_SEND_DATA = 0x22,
//CMD_DISCONNECT_STEPS = 0x23,
//CMD_TERMINATE_STEPS = 0x24,
//CMD_TARGET_COMMAND_COMPLETE_STEPS = 0x25,
//CMD_DISCONNECT = 0x27, // no interrupt
//CMD_RECEIVE_MESSAGE_STEPS = 0x28,
//CMD_RECEIVE_COMMAND = 0x29,
//CMD_RECEIVE_DATA = 0x2A,
//CMD_RECEIVE_COMMAND_STEPS = 0x2B,
CMD_DMA_STOP = 0x04, // no interrupt
CMD_ACCESS_FIFO_COMMAND = 0x05,
// Idle Commands
//CMD_RESELECT_STEPS = 0x40,
CMD_SELECT_NO_ATN = 0x41,
CMD_SELECT_WITH_ATN = 0x42,
//CMD_SELECT_WITH_ATN_AND_STOP = 0x43,
CMD_ENA_SEL_RESEL = 0x44, // no interrupt
//CMD_DISABLE_SEL_RESEL = 0x45,
//CMD_SELECT_WITH_ATN3_STEPS = 0x46,
//CMD_RESELECT_WITH_ATN3_STEPS = 0x47,
// Flags
CMD_OPCODE = 0x7F,
CMD_ISDMA = 0x80,
};
/** Status register bits. **/
enum {
//SCSI_CTRL_IO = 0x01, // Input/Output
//SCSI_CTRL_CD = 0x02, // Command/Data
//SCSI_CTRL_MSG = 0x04, // Message
//STAT_GCV = 0x08, // Group Code Valid
STAT_TC = 0x10, // Terminal count (NCR) / count to zero (AMD)
//STAT_PE = 0x20, // Parity Error
STAT_GE = 0x40, // Gross Error (NCR) / Illegal Operation Error (AMD)
STAT_INT = 0x80, // Interrupt
};
/** Interrupt status register bits. */
enum {
INTSTAT_SRST = 0x80, // bus reset
INTSTAT_ICMD = 0x40, // invalid command
INTSTAT_DIS = 0x20, // disconnected
INTSTAT_SR = 0x10, // service request
INTSTAT_SO = 0x08, // successful operation
INTSTAT_RESEL = 0x04, // reselected
INTSTAT_SELA = 0x02, // selected as a target with attention
INTSTAT_SEL = 0x01, // selected as a target without attention
};
enum {
CFG2_ENF = 0x40, // Am53CF94: enable features (ENF) bit
};
/** Sequencer states. */
namespace SeqState {
enum {
IDLE = 0,
BUS_FREE,
ARB_BEGIN,
ARB_END,
SEL_BEGIN,
SEL_END,
SEND_MSG,
SEND_CMD,
CMD_COMPLETE,
XFER_BEGIN,
XFER_END,
SEND_DATA,
RCV_DATA,
RCV_STATUS,
RCV_MESSAGE,
};
};
/** Sequence descriptor for sequencer commands. */
typedef struct {
int seq_id;
int next_step;
int step_num;
int status;
} SeqDesc;
typedef std::function<void(const uint8_t drq_state)> DrqCb;
class Sc53C94 : public ScsiDevice {
public:
Sc53C94(uint8_t chip_id=12, uint8_t my_id=7);
~Sc53C94() = default;
static std::unique_ptr<HWComponent> create() {
return std::unique_ptr<Sc53C94>(new Sc53C94());
}
// HWComponent methods
int device_postinit();
// 53C94 registers access
uint8_t read(uint8_t reg_offset);
void write(uint8_t reg_offset, uint8_t value);
uint16_t pseudo_dma_read();
void pseudo_dma_write(uint16_t data);
// real DMA control
void real_dma_xfer_out();
void real_dma_xfer_in();
void dma_start();
void dma_wait();
void dma_stop();
void set_dma_channel(DmaBidirChannel *dma_ch) {
this->dma_ch = dma_ch;
auto dbdma_ch = dynamic_cast<DMAChannel*>(dma_ch);
if (dbdma_ch) {
dbdma_ch->set_callbacks(
std::bind(&Sc53C94::dma_start, this),
std::bind(&Sc53C94::dma_stop, this)
);
}
};
void set_drq_callback(DrqCb cb) {
this->drq_cb = cb;
}
// ScsiDevice methods
void notify(ScsiMsg msg_type, int param);
bool prepare_data() { return false; };
bool get_more_data() { return false; };
bool has_data() { return this->data_fifo_pos != 0; };
int send_data(uint8_t* dst_ptr, int count);
void process_command() {};
protected:
void reset_device();
void update_command_reg(uint8_t cmd);
void exec_command();
void exec_next_command();
void fifo_push(const uint8_t data);
uint8_t fifo_pop();
void sequencer();
void seq_defer_state(uint64_t delay_ns);
bool rcv_data();
void update_irq();
private:
uint8_t chip_id = 0;
uint8_t my_bus_id = 0;
uint32_t my_timer_id = 0;
uint8_t cmd_fifo[2];
uint8_t data_fifo[16];
int cmd_fifo_pos = 0;
int data_fifo_pos = 0;
int bytes_out = 0;
bool on_reset = false;
uint32_t xfer_count = 0;
uint32_t set_xfer_count = 0;
uint8_t status = 0;
uint8_t target_id = 0;
uint8_t int_status = 0;
uint8_t seq_step = 0;
uint8_t sel_timeout = 0;
uint8_t sync_offset = 0;
uint8_t clk_factor = 0;
uint8_t config1 = 0;
uint8_t config2 = 0;
uint8_t config3 = 0;
// sequencer state
uint32_t seq_timer_id = 0;
uint32_t cur_state = 0;
uint32_t next_state = 0;
SeqDesc* cmd_steps = nullptr;
bool is_initiator = false;
uint8_t cur_cmd = 0;
bool is_dma_cmd = false;
int cur_bus_phase = 0;
// interrupt related stuff
InterruptCtrl* int_ctrl = nullptr;
uint32_t irq_id = 0;
uint8_t irq = 0;
// DMA related stuff
DmaBidirChannel* dma_ch = nullptr;
DrqCb drq_cb = nullptr;
uint32_t dma_timer_id = 0;
};
#endif // SC_53C94_H
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