// license:BSD-3-Clause // copyright-holders:AJR /*************************************************************************** Adaptec AIC-580 This 84-pin PLCC ASIC provides 16-bit DMA bus mastering capabilities for the AIC-1540A/1542A and AIC-1540B/1542B PC/AT SCSI host adapters and the AIC-1640 Micro Channel SCSI host adapter. No documentation for this IC has been found. It might function somewhat similarly to the AIC-560, which is also poorly documented. ***************************************************************************/ #include "emu.h" #include "aic580.h" //************************************************************************** // GLOBAL VARIABLES //************************************************************************** // device type definition DEFINE_DEVICE_TYPE(AIC580, aic580_device, "aic580", "AIC-580 DMA Bus Master") //************************************************************************** // DEVICE IMPLEMENTATION //************************************************************************** //------------------------------------------------- // aic580_device - constructor //------------------------------------------------- aic580_device::aic580_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : device_t(mconfig, AIC580, tag, owner, clock) , m_bdin_callback(*this) , m_bdout_callback(*this) , m_back_callback(*this) , m_sread_callback(*this) , m_swrite_callback(*this) , m_dma_mode(0) , m_channel_addr{0} , m_fifo_read_index(0) , m_fifo_write_index(0) , m_fifo_data{0} { } //------------------------------------------------- // device_resolve_objects - resolve objects that // may be needed for other devices to set // initial conditions at start time //------------------------------------------------- void aic580_device::device_resolve_objects() { // resolve callbacks m_bdin_callback.resolve_safe(0); m_bdout_callback.resolve_safe(); m_back_callback.resolve_safe(); m_sread_callback.resolve_safe(0); m_swrite_callback.resolve_safe(); } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void aic580_device::device_start() { // register state save_item(NAME(m_dma_mode)); save_item(NAME(m_channel_addr)); save_item(NAME(m_fifo_read_index)); save_item(NAME(m_fifo_write_index)); save_item(NAME(m_fifo_data)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void aic580_device::device_reset() { m_fifo_read_index = 0; m_fifo_write_index = 0; m_dma_mode = 0; } //------------------------------------------------- // breq_w - handle transfer requests for port B //------------------------------------------------- WRITE_LINE_MEMBER(aic580_device::breq_w) { if (state) { if (m_dma_mode == 0x80) { m_fifo_data[m_fifo_write_index] = m_bdin_callback(); m_fifo_write_index = (m_fifo_write_index + 1) & 15; m_back_callback(0); } else if (m_dma_mode == 0x90) { m_bdout_callback(m_fifo_data[m_fifo_read_index]); m_fifo_read_index = (m_fifo_read_index + 1) & 15; m_back_callback(0); } else logerror("BREQ with unemulated DMA mode %02X\n", m_dma_mode); } } //************************************************************************** // REGISTER HANDLERS //************************************************************************** //------------------------------------------------- // r80_r - local read from register 80h //------------------------------------------------- u8 aic580_device::r80_r() { if (!machine().side_effects_disabled()) logerror("%s: Read from register 80h\n", machine().describe_context()); return 0; } //------------------------------------------------- // transfer_speed_w - local write to register 80h //------------------------------------------------- void aic580_device::transfer_speed_w(u8 data) { logerror("Transfer speed: %dns read pulse, %dns strobe off, %dns write pulse (%.2f MB/s)\n", int(1.0E9 * (((data & 0x30) >> 4) + 2) / clock()), int(1.0E9 * (((data & 0x08) >> 3) + 2) / clock()), int(1.0E9 * ((data & 0x07) + 2) / clock()), clock() * 2.0E-6 / ((BIT(data, 3) ? 5 : 4) + (data & 7))); } //------------------------------------------------- // dma_mode_w - local write to register 82h //------------------------------------------------- void aic580_device::dma_mode_w(u8 data) { m_dma_mode = data; } //------------------------------------------------- // r83_w - local write to register 83h //------------------------------------------------- void aic580_device::r83_w(u8 data) { logerror("%s: Write %02Xh to register 83h\n", machine().describe_context(), data); } //------------------------------------------------- // r86_w - local write to register 86h //------------------------------------------------- void aic580_device::r86_w(u8 data) { logerror("%s: Write %02Xh to register 86h\n", machine().describe_context(), data); } //------------------------------------------------- // r88_r - local read from register 88h //------------------------------------------------- u8 aic580_device::r88_r() { if (!machine().side_effects_disabled()) logerror("%s: Read from register 88h\n", machine().describe_context()); return 0; } //------------------------------------------------- // r88_w - local write to register 88h //------------------------------------------------- void aic580_device::r88_w(u8 data) { logerror("%s: Write %02Xh to register 88h\n", machine().describe_context(), data); } //------------------------------------------------- // r8a_w - local write to register 8Ah //------------------------------------------------- void aic580_device::r8a_w(u8 data) { logerror("%s: Write %02Xh to register 8Ah\n", machine().describe_context(), data); } //------------------------------------------------- // r8b_w - local write to register 8Bh //------------------------------------------------- void aic580_device::r8b_w(u8 data) { logerror("%s: Write %02Xh to register 8Bh\n", machine().describe_context(), data); } //------------------------------------------------- // bus_on_time_w - local write to register 8Ch //------------------------------------------------- void aic580_device::bus_on_time_w(u8 data) { logerror("Bus on time = %d microseconds\n", data & 0x0f); } //------------------------------------------------- // bus_off_time_w - local write to register 8Dh //------------------------------------------------- void aic580_device::bus_off_time_w(u8 data) { logerror("Bus off time = %d microseconds\n", std::max(1, (data & 0x0f) * 4)); } //------------------------------------------------- // ch_addrl_w - set bits 7:0 of buffer address // for channel 1 or 2 //------------------------------------------------- template void aic580_device::ch_addrl_w(u8 data) { m_channel_addr[Channel] = (m_channel_addr[Channel] & 0xffff00) | data; } //------------------------------------------------- // ch_addrm_w - set bits 15:8 of buffer address // for channel 1 or 2 //------------------------------------------------- template void aic580_device::ch_addrm_w(u8 data) { m_channel_addr[Channel] = (m_channel_addr[Channel] & 0xff00ff) | u32(data) << 8; } //------------------------------------------------- // ch_addrh_w - set bits 23:16 of buffer address // for channel 1 or 2 //------------------------------------------------- template void aic580_device::ch_addrh_w(u8 data) { m_channel_addr[Channel] = (m_channel_addr[Channel] & 0x00ffff) | u32(data) << 16; } //------------------------------------------------- // ra2_w - local write to register A2h //------------------------------------------------- void aic580_device::ra2_w(u8 data) { logerror("%s: Write %02Xh to register A2h\n", machine().describe_context(), data); } //------------------------------------------------- // ra3_w - local write to register A3h //------------------------------------------------- void aic580_device::ra3_w(u8 data) { logerror("%s: Write %02Xh to register A3h\n", machine().describe_context(), data); } //------------------------------------------------- // ra4_w - local write to register A4h //------------------------------------------------- void aic580_device::ra4_w(u8 data) { logerror("%s: Write %02Xh to register A4h\n", machine().describe_context(), data); } //------------------------------------------------- // fifo_data_r - local read from register ACh //------------------------------------------------- u8 aic580_device::fifo_data_r() { const u8 data = m_fifo_data[m_fifo_read_index]; if (!machine().side_effects_disabled()) m_fifo_read_index = (m_fifo_read_index + 1) & 15; return data; } //------------------------------------------------- // fifo_data_w - local write to register ACh //------------------------------------------------- void aic580_device::fifo_data_w(u8 data) { m_fifo_data[m_fifo_write_index] = data; if (!machine().side_effects_disabled()) m_fifo_write_index = (m_fifo_write_index + 1) & 15; } //------------------------------------------------- // buffer_r - local read from registers C0h–CFh //------------------------------------------------- u8 aic580_device::buffer_r(offs_t offset) { return m_fifo_data[offset]; } //------------------------------------------------- // buffer_w - local write to registers C0h–CFh //------------------------------------------------- void aic580_device::buffer_w(offs_t offset, u8 data) { m_fifo_data[offset] = data; } //------------------------------------------------- // mpu_map - address map for local microprocessor //------------------------------------------------- void aic580_device::mpu_map(address_map &map) { map(0x80, 0x80).rw(FUNC(aic580_device::r80_r), FUNC(aic580_device::transfer_speed_w)); map(0x82, 0x82).w(FUNC(aic580_device::dma_mode_w)); map(0x83, 0x83).w(FUNC(aic580_device::r83_w)); map(0x86, 0x86).w(FUNC(aic580_device::r86_w)); map(0x88, 0x88).rw(FUNC(aic580_device::r88_r), FUNC(aic580_device::r88_w)); map(0x8a, 0x8a).w(FUNC(aic580_device::r8a_w)); map(0x8b, 0x8b).w(FUNC(aic580_device::r8b_w)); map(0x8c, 0x8c).w(FUNC(aic580_device::bus_on_time_w)); map(0x8d, 0x8d).w(FUNC(aic580_device::bus_off_time_w)); map(0x98, 0x98).w(FUNC(aic580_device::ch_addrl_w<0>)); map(0x99, 0x99).w(FUNC(aic580_device::ch_addrm_w<0>)); map(0x9a, 0x9a).w(FUNC(aic580_device::ch_addrh_w<0>)); map(0x9c, 0x9c).w(FUNC(aic580_device::ch_addrl_w<1>)); map(0x9d, 0x9d).w(FUNC(aic580_device::ch_addrm_w<1>)); map(0x9e, 0x9e).w(FUNC(aic580_device::ch_addrh_w<1>)); map(0xa2, 0xa2).w(FUNC(aic580_device::ra2_w)); map(0xa3, 0xa3).w(FUNC(aic580_device::ra3_w)); map(0xa4, 0xa4).w(FUNC(aic580_device::ra4_w)); map(0xac, 0xac).rw(FUNC(aic580_device::fifo_data_r), FUNC(aic580_device::fifo_data_w)); map(0xc0, 0xcf).rw(FUNC(aic580_device::buffer_r), FUNC(aic580_device::buffer_w)); }