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99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
//
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// pi/controller.h: Parallel interface controller.
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//
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// CEN64: Cycle-Accurate Nintendo 64 Emulator.
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// Copyright (C) 2015, Tyler J. Stachecki.
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//
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// This file is subject to the terms and conditions defined in
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// 'LICENSE', which is part of this source code package.
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//
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#ifndef __pi_controller_h__
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#define __pi_controller_h__
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#include "common.h"
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#include "os/common/save_file.h"
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enum pi_register {
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#define X(reg) reg,
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#include "pi/registers.md"
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#undef X
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NUM_PI_REGISTERS
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};
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#ifdef DEBUG_MMIO_REGISTER_ACCESS
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extern const char *pi_register_mnemonics[NUM_PI_REGISTERS];
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#endif
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enum pi_status {
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PI_STATUS_DMA_BUSY = 1 << 0,
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PI_STATUS_IO_BUSY = 1 << 1,
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PI_STATUS_ERROR = 1 << 2,
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PI_STATUS_INTERRUPT = 1 << 3,
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PI_STATUS_IS_BUSY = PI_STATUS_DMA_BUSY | PI_STATUS_IO_BUSY
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};
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enum pi_status_write {
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PI_STATUS_RESET_CONTROLLER = 1 << 0,
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PI_STATUS_CLEAR_INTERRUPT = 1 << 1
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};
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#define FLASHRAM_SIZE 0x20000
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enum flashram_mode {
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FLASHRAM_IDLE = 0,
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FLASHRAM_ERASE,
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FLASHRAM_WRITE,
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FLASHRAM_READ,
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FLASHRAM_STATUS,
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};
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struct flashram {
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uint8_t *data;
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uint64_t status;
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enum flashram_mode mode;
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size_t offset;
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size_t rdram_pointer;
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};
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struct pi_controller {
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struct bus_controller *bus;
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const uint8_t *rom;
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size_t rom_size;
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const struct save_file *sram;
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const struct save_file *flashram_file;
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struct flashram flashram;
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struct is_viewer *is_viewer;
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uint64_t counter;
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uint32_t bytes_to_copy;
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bool is_dma_read;
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uint32_t regs[NUM_PI_REGISTERS];
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};
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cen64_cold int pi_init(struct pi_controller *pi, struct bus_controller *bus,
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const uint8_t *rom, size_t rom_size, const struct save_file *sram,
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const struct save_file *flashram, struct is_viewer *is);
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// Only invoke pi_cycle_ when the counter has expired (timeout).
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void pi_cycle_(struct pi_controller *pi);
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cen64_flatten cen64_hot static inline void pi_cycle(struct pi_controller *pi) {
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if (unlikely(pi->counter-- == 0))
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pi_cycle_(pi);
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}
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int read_cart_rom(void *opaque, uint32_t address, uint32_t *word);
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int read_pi_regs(void *opaque, uint32_t address, uint32_t *word);
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int write_cart_rom(void *opaque, uint32_t address, uint32_t word, uint32_t dqm);
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int write_pi_regs(void *opaque, uint32_t address, uint32_t word, uint32_t dqm);
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int read_flashram(void *opaque, uint32_t address, uint32_t *word);
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int write_flashram(void *opaque, uint32_t address, uint32_t word, uint32_t dqm);
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int read_sram(void *opaque, uint32_t address, uint32_t *word);
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int write_sram(void *opaque, uint32_t address, uint32_t word, uint32_t dqm);
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#endif
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