diff options
Diffstat (limited to 'src/mame/machine/mips_rambo.cpp')
| -rw-r--r-- | src/mame/machine/mips_rambo.cpp | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/src/mame/machine/mips_rambo.cpp b/src/mame/machine/mips_rambo.cpp new file mode 100644 index 00000000000..ce170ddfc01 --- /dev/null +++ b/src/mame/machine/mips_rambo.cpp @@ -0,0 +1,174 @@ +// license:BSD-3-Clause +// copyright-holders:Patrick Mackinlay + +/* + * DMA/timer ASIC used in MIPS Pizazz architecture systems. + * + * Sources: + * + * https://github.com/NetBSD/src/blob/trunk/sys/arch/mipsco/obio/rambo.h + * + * TODO + * - interrupts + * - dma + * - timer + * - buzzer + */ + +#include "emu.h" +#include "mips_rambo.h" + +#define LOG_GENERAL (1U << 0) +#define LOG_REG (1U << 1) + +//#define VERBOSE (LOG_GENERAL|LOG_REG) +#include "logmacro.h" + +DEFINE_DEVICE_TYPE(MIPS_RAMBO, mips_rambo_device, "mips_rambo", "MIPS RAMBO") + +mips_rambo_device::mips_rambo_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, MIPS_RAMBO, tag, owner, clock) + , m_ram(*this, finder_base::DUMMY_TAG) + , m_irq_out_cb(*this) + , m_parity_out_cb(*this) + , m_timer_out_cb(*this) + , m_buzzer_out_cb(*this) + , m_irq_out_state(0) + , m_buzzer_out_state(0) +{ +} + +void mips_rambo_device::map(address_map &map) +{ + map(0x000, 0x003).rw(FUNC(mips_rambo_device::load_address_r<0>), FUNC(mips_rambo_device::load_address_w<0>)); + map(0x100, 0x103).r(FUNC(mips_rambo_device::diag_r<0>)); + map(0x202, 0x203).rw(FUNC(mips_rambo_device::fifo_r<0>), FUNC(mips_rambo_device::fifo_w<0>)); + map(0x300, 0x303).rw(FUNC(mips_rambo_device::mode_r<0>), FUNC(mips_rambo_device::mode_w<0>)); + map(0x402, 0x403).rw(FUNC(mips_rambo_device::block_count_r<0>), FUNC(mips_rambo_device::block_count_w<0>)); + map(0x500, 0x503).r(FUNC(mips_rambo_device::current_address_r<0>)); + + map(0x600, 0x603).rw(FUNC(mips_rambo_device::load_address_r<1>), FUNC(mips_rambo_device::load_address_w<1>)); + map(0x700, 0x703).r(FUNC(mips_rambo_device::diag_r<1>)); + map(0x802, 0x803).rw(FUNC(mips_rambo_device::fifo_r<1>), FUNC(mips_rambo_device::fifo_w<1>)); + map(0x900, 0x903).rw(FUNC(mips_rambo_device::mode_r<1>), FUNC(mips_rambo_device::mode_w<1>)); + map(0xa02, 0xa03).rw(FUNC(mips_rambo_device::block_count_r<1>), FUNC(mips_rambo_device::block_count_w<1>)); + map(0xb00, 0xb03).r(FUNC(mips_rambo_device::current_address_r<1>)); + + map(0xc00, 0xc03).rw(FUNC(mips_rambo_device::tcount_r), FUNC(mips_rambo_device::tcount_w)); + map(0xd00, 0xd03).rw(FUNC(mips_rambo_device::tbreak_r), FUNC(mips_rambo_device::tbreak_w)); + map(0xe00, 0xe03).r(FUNC(mips_rambo_device::error_r)); + map(0xf00, 0xf03).rw(FUNC(mips_rambo_device::control_r), FUNC(mips_rambo_device::control_w)); +} + +void mips_rambo_device::device_start() +{ + m_irq_out_cb.resolve_safe(); + m_parity_out_cb.resolve_safe(); + m_timer_out_cb.resolve_safe(); + m_buzzer_out_cb.resolve_safe(); + + m_buzzer_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(mips_rambo_device::buzzer_toggle), this)); + +} + +void mips_rambo_device::device_reset() +{ + // TODO: update interrupts + + m_tcount = machine().time(); +} + +READ32_MEMBER(mips_rambo_device::tcount_r) +{ + return attotime_to_clocks(machine().time() - m_tcount); +} + +WRITE32_MEMBER(mips_rambo_device::tcount_w) +{ + LOGMASKED(LOG_REG, "tcount_w 0x%08x (%s)\n", data, machine().describe_context()); + + m_tcount = machine().time(); +} + +WRITE32_MEMBER(mips_rambo_device::tbreak_w) +{ + LOGMASKED(LOG_REG, "tbreak_w 0x%08x (%s)\n", data, machine().describe_context()); +} + +WRITE32_MEMBER(mips_rambo_device::control_w) +{ + LOGMASKED(LOG_REG, "control_w 0x%08x (%s)\n", data, machine().describe_context()); + + // stop the buzzer + m_buzzer_timer->enable(false); + m_buzzer_out_state = 0; + m_buzzer_out_cb(m_buzzer_out_state); + + // start the buzzer if requested + if (data & CONTROL_BUZZON) + { + attotime const period = attotime::from_ticks(1 << ((data & CONTROL_BUZZMASK) >> 4), 1524_Hz_XTAL); + + m_buzzer_timer->adjust(period, 0, period); + } +} + +template <unsigned Channel> WRITE32_MEMBER(mips_rambo_device::load_address_w) +{ + LOGMASKED(LOG_REG, "load_address_w<%d> 0x%08x (%s)\n", Channel, data, machine().describe_context()); + + COMBINE_DATA(&m_channel[Channel].load_address); +} + +template <unsigned Channel> WRITE16_MEMBER(mips_rambo_device::fifo_w) +{ + LOGMASKED(LOG_REG, "fifo_w<%d> 0x%04x (%s)\n", Channel, data, machine().describe_context()); +} + +template <unsigned Channel> WRITE32_MEMBER(mips_rambo_device::mode_w) +{ + LOGMASKED(LOG_REG, "mode_w<%d> 0x%08x (%s)\n", Channel, data, machine().describe_context()); + + COMBINE_DATA(&m_channel[Channel].mode); +} + +template <unsigned Channel> WRITE16_MEMBER(mips_rambo_device::block_count_w) +{ + LOGMASKED(LOG_REG, "block_count_w<%d> 0x%04x (%s)\n", Channel, data, machine().describe_context()); + + COMBINE_DATA(&m_channel[Channel].block_count); +} + +TIMER_CALLBACK_MEMBER(mips_rambo_device::buzzer_toggle) +{ + m_buzzer_out_state = !m_buzzer_out_state; + m_buzzer_out_cb(m_buzzer_out_state); +} + +u32 mips_rambo_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) +{ + // check if dma channel is configured + u32 const blocks_required = (screen.visible_area().height() * screen.visible_area().width()) >> 9; + if (!(m_channel[1].mode & MODE_CHANNEL_EN) || !(m_channel[1].mode & MODE_AUTO_RELOAD) || (m_channel[1].block_count != blocks_required)) + return 1; + + u32 address = m_channel[1].load_address; + for (int y = screen.visible_area().min_y; y <= screen.visible_area().max_y; y++) + for (int x = screen.visible_area().min_x; x <= screen.visible_area().max_x; x += 8) + { + u8 pixel_data = m_ram->read(BYTE4_XOR_BE(address)); + + bitmap.pix(y, x + 0) = BIT(pixel_data, 7) ? rgb_t::white() : rgb_t::black(); + bitmap.pix(y, x + 1) = BIT(pixel_data, 6) ? rgb_t::white() : rgb_t::black(); + bitmap.pix(y, x + 2) = BIT(pixel_data, 5) ? rgb_t::white() : rgb_t::black(); + bitmap.pix(y, x + 3) = BIT(pixel_data, 4) ? rgb_t::white() : rgb_t::black(); + bitmap.pix(y, x + 4) = BIT(pixel_data, 3) ? rgb_t::white() : rgb_t::black(); + bitmap.pix(y, x + 5) = BIT(pixel_data, 2) ? rgb_t::white() : rgb_t::black(); + bitmap.pix(y, x + 6) = BIT(pixel_data, 1) ? rgb_t::white() : rgb_t::black(); + bitmap.pix(y, x + 7) = BIT(pixel_data, 0) ? rgb_t::white() : rgb_t::black(); + + address++; + } + + return 0; +} |