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dingusppc/devices/ioctrl/amic.h
Maxim Poliakovski 5b90a3e21d AMIC: rework and improve interrupts.
2023-08-01 17:42:52 +02:00

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/*
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/>.
*/
/** @file Apple memory-mapped I/O controller emulation. */
#ifndef AMIC_H
#define AMIC_H
#include <devices/common/hwinterrupt.h>
#include <devices/common/mmiodevice.h>
#include <devices/common/scsi/sc53c94.h>
#include <devices/common/viacuda.h>
#include <devices/ethernet/mace.h>
#include <devices/floppy/swim3.h>
#include <devices/serial/escc.h>
#include <devices/sound/awacs.h>
#include <devices/video/displayid.h>
#include <devices/video/pdmonboard.h>
#include <cinttypes>
#include <memory>
/** Interrupt related constants. */
/** CPU interrupt register bits. */
enum : uint8_t {
CPU_INT_VIA1 = 1 << 0, // (R) VIA1 interrupts
CPU_INT_VIA2 = 1 << 1, // (R) pseudo VIA2 interrupts
CPU_INT_ESCC = 1 << 2, // (R) ESCC interrupt
CPU_INT_ENET = 1 << 3, // (R) ethernet interrupt
CPU_INT_ALL_DMA = 1 << 4, // (R) all DMA interrupts are signalled here
CPU_INT_NMI = 1 << 5, // (R) non-maskable interrupt
CPU_INT_MODE = 1 << 6, // (R/W) interrupt mode: 0 - native, 1 - 68k-style
CPU_INT_CLEAR = 1 << 7, // (R/W) writing "1" clears CPU interrupt flag
CPU_INT_FLAG = 1 << 7 // special constant for manipulating CPU int flag
};
/** Pseudo VIA2 interrupt flag/enable register bits. */
enum : uint8_t {
VIA2_INT_SCSI_DRQ = 1 << 0, // (R) SCSI DRQ interrupt
VIA2_INT_ALL_SLOT = 1 << 1, // (R) all slot interrupts are signalled here
VIA2_INT_SCSI_IRQ = 1 << 3, // (R) SCSI IRQ interrupt
VIA2_INT_SOUND = 1 << 4, // (R) sound chip (AWACS) interrupt
VIA2_INT_SWIM3 = 1 << 5, // (R) floppy disk controller interrupt
VIA2_INT_IRQ = 1 << 7, // (R) all VIA2 interrupts are signalled here
};
/** Slot interrupt flag/enable register bits. */
enum : uint8_t {
SLOT_INT_SLOT_0 = 1 << 2, // (R) ColdFusion Nubus slot 0 interrupt
SLOT_INT_SLOT_1 = 1 << 3, // (R) ColdFusion Nubus slot 1 interrupt
SLOT_INT_SLOT_2 = 1 << 4, // (R) ColdFusion Nubus slot 2 interrupt
SLOT_INT_SLOT_VDS = 1 << 5, // (R) ColdFusion video direct slot interrupt
SLOT_INT_SLOT_PDS = 1 << 5, // (R) PDM processor direct slot interrupt
SLOT_INT_VBL = 1 << 6, // (R) built-in video VBL interrupt
};
/** AMIC sound buffers are located at fixed offsets from DMA base. */
#define AMIC_SND_BUF0_OFFS 0x10000
#define AMIC_SND_BUF1_OFFS 0x12000
// PDM HWInit source defines two constants: kExpBit = 0x80 and kCmdBit = 0x40
// I don't know what they mean but it seems that their combination will
// cause sound control parameters to be transferred to the sound chip.
#define PDM_SND_CTRL_VALID 0xC0
#define PDM_DMA_IF1 0x80 // DMA interrupt flag => buffer 1 drained
#define PDM_DMA_IF0 0x40 // DMA interrupt flag => buffer 0 drained
#define PDM_DMA_INTS_MASK 0xF0 // mask for clearing all interrupt flags
/** AMIC-specific sound output DMA implementation. */
class AmicSndOutDma : public DmaOutChannel {
public:
AmicSndOutDma();
~AmicSndOutDma() = default;
void init(uint32_t buf_base, uint32_t buf_samples);
void enable() { this->enabled = true; };
void disable() { this->enabled = false; };
uint8_t read_stat();
void write_dma_out_ctrl(uint8_t value);
uint32_t get_cur_buf_pos() { return this->cur_buf_pos; };
DmaPullResult pull_data(uint32_t req_len, uint32_t *avail_len,
uint8_t **p_data);
private:
bool enabled;
uint8_t dma_out_ctrl;
uint32_t out_buf0;
uint32_t out_buf1;
uint32_t out_buf_len;
uint32_t snd_buf_num;
uint32_t cur_buf_pos;
};
/** AMIC-specific floppy DMA implementation. */
class AmicFloppyDma : public DmaBidirChannel {
public:
AmicFloppyDma() = default;
~AmicFloppyDma() = default;
void reinit(const uint32_t addr_ptr, const uint16_t byte_cnt);
void reset(const uint32_t addr_ptr);
void write_ctrl(const uint8_t value);
uint8_t read_stat() { return this->stat; };
int push_data(const char* src_ptr, int len);
DmaPullResult pull_data(uint32_t req_len, uint32_t *avail_len,
uint8_t **p_data);
private:
uint32_t addr_ptr;
uint16_t byte_count;
uint8_t stat;
};
/** AMIC-specific SCSI DMA implementation. */
class AmicScsiDma : public DmaBidirChannel {
public:
AmicScsiDma() = default;
~AmicScsiDma() = default;
void reinit(const uint32_t addr_ptr);
void reset(const uint32_t addr_ptr);
void write_ctrl(const uint8_t value);
uint8_t read_stat() { return this->stat; };
int push_data(const char* src_ptr, int len);
DmaPullResult pull_data(uint32_t req_len, uint32_t *avail_len,
uint8_t **p_data);
private:
uint32_t addr_ptr;
uint16_t byte_count;
uint8_t stat;
};
// macro for byte wise updating of AMIC DMA address registers
#define SET_ADDR_BYTE(reg, offset, value) \
mask = 0xFF000000UL >> (8 * ((offset) & 3)); \
(reg) = ((reg) & ~mask) | (((value) & 0xFF) << (8 * (3 - ((offset) & 3))));
// macro for byte wise updating of AMIC DMA size registers
#define SET_SIZE_BYTE(reg, offset, value) \
mask = 0xFF00U >> (8 * ((offset) & 1)); \
(reg) = ((reg) & ~mask) | (((value) & 0xFF) << (8 * (((offset) & 1) ^ 1)));
/* AMIC registers offsets from AMIC base (0x50F00000). */
enum AMICReg : uint32_t {
// Sound control registers
Snd_Ctrl_0 = 0x14000, // audio codec control register 0
Snd_Ctrl_1 = 0x14001, // audio codec control register 1
Snd_Ctrl_2 = 0x14002, // audio codec control register 2
Snd_Stat_0 = 0x14004, // audio codec status register 0
Snd_Stat_1 = 0x14005, // audio codec status register 1
Snd_Stat_2 = 0x14006, // audio codec status register 2
Snd_Buf_Size_Hi = 0x14008, // sound buffer size, high-order byte
Snd_Buf_Size_Lo = 0x14009, // sound buffer size, low-order byte
Snd_Phase0 = 0x1400C, // high-order byte of the sound phase register
Snd_Phase1 = 0x1400D, // middle byte of the sound phase register
Snd_Phase2 = 0x1400E, // low-order byte of the sound phase register
Snd_Out_Ctrl = 0x14010, // audio codec output control register
Snd_In_Ctrl = 0x14011, // audio codec input control register
Snd_In_DMA = 0x14014, // sound input DMA status/control register
Snd_Out_DMA = 0x14018, // sound output DMA status/control register
// Video DAC (Ariel II) control registers
Ariel_Clut_Index = 0x24000,
Ariel_Clut_Color = 0x24001,
Ariel_Config = 0x24002,
// VIA2 registers
VIA2_Slot_IFR = 0x26002,
VIA2_IFR = 0x26003,
VIA2_Slot_IER = 0x26012,
VIA2_IER = 0x26013,
VIA2_IFR_RBV = 0x27A03, // RBV-compatible mirror for the VIA2_IFR
VIA2_IER_RBV = 0x27C13, // RBV-compatible mirror for the VIA2_IER
// Video control registers
Video_Mode = 0x28000,
Pixel_Depth = 0x28001,
Monitor_Id = 0x28002,
// Interrupt registers
Int_Ctrl = 0x2A000,
DMA_Int_0 = 0x2A008,
Bus_Err_Int_0 = 0x2A009,
DMA_Int_1 = 0x2A00A,
Bus_Err_Int_1 = 0x2A00B,
// Undocumented diagnostics register
Diag_Reg = 0x2C000,
// DMA control registers
DMA_Base_Addr_0 = 0x31000,
DMA_Base_Addr_1 = 0x31001,
DMA_Base_Addr_2 = 0x31002,
DMA_Base_Addr_3 = 0x31003,
Enet_DMA_Xmt_Ctrl = 0x31C20,
Enet_DMA_Rcv_Ctrl = 0x32028,
// SCSI DMA registers
SCSI_DMA_Base_0 = 0x32000,
SCSI_DMA_Base_1 = 0x32001,
SCSI_DMA_Base_2 = 0x32002,
SCSI_DMA_Base_3 = 0x32003,
SCSI_DMA_Ctrl = 0x32008,
// Floppy (SWIM3) DMA registers
Floppy_Addr_Ptr_0 = 0x32060,
Floppy_Addr_Ptr_1 = 0x32061,
Floppy_Addr_Ptr_2 = 0x32062,
Floppy_Addr_Ptr_3 = 0x32063,
Floppy_Byte_Cnt_Hi = 0x32064,
Floppy_Byte_Cnt_Lo = 0x32065,
Floppy_DMA_Ctrl = 0x32068,
SCC_DMA_Xmt_A_Ctrl = 0x32088,
SCC_DMA_Rcv_A_Ctrl = 0x32098,
SCC_DMA_Xmt_B_Ctrl = 0x320A8,
SCC_DMA_Rcv_B_Ctrl = 0x320B8,
};
/** Apple Memory-mapped I/O controller device. */
class AMIC : public MMIODevice, public InterruptCtrl {
public:
AMIC();
~AMIC() = default;
static std::unique_ptr<HWComponent> create() {
return std::unique_ptr<AMIC>(new AMIC());
}
// HWComponent methods
int device_postinit();
/* 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);
// InterruptCtrl methods
uint32_t register_dev_int(IntSrc src_id);
uint32_t register_dma_int(IntSrc src_id);
void ack_int(uint32_t irq_id, uint8_t irq_line_state);
void ack_dma_int(uint32_t irq_id, uint8_t irq_line_state);
protected:
void ack_slot_int(uint32_t irq_id, uint8_t irq_line_state);
void ack_via2_int(uint32_t irq_id, uint8_t irq_line_state);
void ack_cpu_int(uint32_t irq_id, uint8_t irq_line_state);
void update_via2_irq();
private:
uint8_t imm_snd_regs[4]; // temporary storage for sound control registers
uint8_t emmo_pin; // EMMO aka factory tester pin status, active low
uint32_t dma_base = 0; // DMA physical base address
uint32_t scsi_dma_base = 0; // physical base address for SCSI DMA
uint16_t snd_buf_size = 0; // sound buffer size in bytes
uint8_t snd_out_ctrl = 0;
// floppy DMA state
uint32_t floppy_addr_ptr;
uint16_t floppy_byte_cnt;
// SCSI DMA state
uint32_t scsi_addr_ptr;
//uint8_t scsi_dma_cs = 0; // SCSI DMA control/status register value
// interrupt state
uint8_t int_ctrl = 0;
uint8_t dev_irq_lines = 0; // state of the IRQ lines
// pseudo VIA2 state
uint8_t via2_ier = 0;
uint8_t via2_ifr = 0;
uint8_t via2_irq = 0;
uint8_t via2_slot_ier = 0; // normal logic
uint8_t via2_slot_ifr = 0x7F; // reverse logic
uint8_t via2_slot_irq = 0; // normal logic
uint32_t pseudo_vbl_tid; // ID for the pseudo-VBL timer
// AMIC subdevice instances
Sc53C94* scsi;
EsccController* escc;
MaceController* mace;
ViaCuda* viacuda;
Swim3::Swim3Ctrl* swim3;
std::unique_ptr<AwacDevicePdm> awacs;
std::unique_ptr<AmicSndOutDma> snd_out_dma;
std::unique_ptr<AmicFloppyDma> floppy_dma;
std::unique_ptr<AmicScsiDma> scsi_dma;
// on-board video
std::unique_ptr<DisplayID> disp_id;
std::unique_ptr<PdmOnboardVideo> def_vid;
uint8_t mon_id;
};
#endif // AMIC_H
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