Zack Buhman
25fef821b0
There were two notable bugs: - the maple transfer/data sizes were not being set correctly - align_32byte always realigned the address of `_scene`, and not the `mem` parameter as expected. This had the effect of the maple-DMA send and receive buffers being the same buffer. On real hardware, this causes unpredicable behavior.
101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
#include <cstdint>
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#include <bit>
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#include "../sh7091.h"
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#include "../sh7091_bits.h"
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#include "../systembus.h"
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#include "../systembus_bits.h"
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#include "maple_bits.h"
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#include "maple_host_bits.h"
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#include "maple_bus_commands.h"
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#include "maple.h"
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template <typename T>
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struct maple_host_command {
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uint32_t host_instruction;
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uint32_t receive_data_storage_address;
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struct bus_data {
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uint8_t command_code;
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uint8_t destination_ap;
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uint8_t source_ap;
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uint8_t data_size;
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T data_fields;
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} bus_data;
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};
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void maple_init_host_command(uint32_t * buf, uint32_t * receive_address, uint8_t command_code, uint8_t data_size)
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{
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// this function does not care about the template instantiation of
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// maple_host_command--data_fields is not manipulated here.
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auto host_command = reinterpret_cast<maple_host_command<uint32_t> *>(buf);
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host_command->host_instruction = host_instruction::end_flag
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| host_instruction::port_select::a
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| host_instruction::transfer_length((data_size / 4));
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host_command->receive_data_storage_address = reinterpret_cast<uint32_t>(receive_address) & 0x1fff'ffff;
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host_command->bus_data.command_code = command_code;
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host_command->bus_data.destination_ap = ap::de::device | ap::port_select::a;
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host_command->bus_data.source_ap = ap::port_select::a;
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host_command->bus_data.data_size = data_size / 4;
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}
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void maple_init_device_request(uint32_t * buf, uint32_t * receive_address)
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{
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maple_init_host_command(buf, receive_address, device_request::command_code, (sizeof (struct device_request::data_fields)));
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}
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void maple_init_get_condition(uint32_t * buf, uint32_t * receive_address)
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{
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maple_init_host_command(buf, receive_address, get_condition::command_code, (sizeof (struct get_condition::data_fields)));
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auto host_command = reinterpret_cast<maple_host_command<get_condition::data_fields> *>(buf);
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auto& function_type = host_command->bus_data.data_fields.function_type;
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// controller function type
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function_type[0] = 0x00;
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function_type[1] = 0x00;
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function_type[2] = 0x00;
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function_type[3] = 0x01;
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}
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void maple_dma_start(uint32_t * command_buf)
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{
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sh7091.DMAC.DMAOR = DMAOR__DDT /* on-demand data transfer mode */
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| DMAOR__PR__CH2_CH0_CH1_CH3 /* priority mode; CH2 > CH0 > CH1 > CH3 */
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| DMAOR__DME; /* DMAC master enable */
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// clear maple-DMA end status
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system.ISTNRM = ISTNRM__END_OF_DMA_MAPLE_DMA;
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// disable maple-DMA
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maple_if.MDEN = mden::dma_enable::abort;
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while (mdst::start_status::status(maple_if.MDST) != 0);
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// 20nsec * 0xc350 = 1ms
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constexpr uint32_t one_msec = 0xc350;
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maple_if.MSYS = msys::time_out_counter(one_msec)
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| msys::sending_rate::_2M;
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/* top address: the first/lowest address
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bottom address: the last/highest address */
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maple_if.MDAPRO = mdapro::security_code
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| mdapro::top_address(0x00)
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| mdapro::bottom_address(0x7f);
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maple_if.MDTSEL = mdtsel::trigger_select::software_initiation;
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maple_if.MDSTAR = mdstar::table_address(reinterpret_cast<uint32_t>(command_buf));
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maple_if.MDEN = mden::dma_enable::enable;
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maple_if.MDST = mdst::start_status::start;
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// wait for completion
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//while (mdst::start_status::status(maple_if.MDST) != 0);
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while ((system.ISTNRM & ISTNRM__END_OF_DMA_MAPLE_DMA) == 0);
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system.ISTNRM = ISTNRM__END_OF_DMA_MAPLE_DMA;
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}
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