diff options
Diffstat (limited to 'src/devices/machine/ps2timer.cpp')
-rw-r--r-- | src/devices/machine/ps2timer.cpp | 272 |
1 files changed, 272 insertions, 0 deletions
diff --git a/src/devices/machine/ps2timer.cpp b/src/devices/machine/ps2timer.cpp new file mode 100644 index 00000000000..70970a6784a --- /dev/null +++ b/src/devices/machine/ps2timer.cpp @@ -0,0 +1,272 @@ +// license:BSD-3-Clause +// copyright-holders:Ryan Holtz +/****************************************************************************** +* +* Sony PlayStation 2 EE timer device skeleton +* +* To Do: +* Everything +* +*/ + +#include "emu.h" +#include "ps2timer.h" + +DEFINE_DEVICE_TYPE(SONYPS2_TIMER, ps2_timer_device, "ps2timer", "PlayStation 2 EE Core Timer") + +ps2_timer_device::ps2_timer_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, SONYPS2_TIMER, tag, owner, clock) + , m_compare_timer(nullptr) + , m_overflow_timer(nullptr) + , m_mode(0) + , m_last_enable_time(attotime::zero) + , m_last_update_time(attotime::zero) + , m_elapsed_time(attotime::zero) + , m_enabled(false) + , m_zero_return(false) + , m_count(0) + , m_compare(0) + , m_can_hold(false) + , m_hold(0) + , m_clk_select(CLKS_BUSCLK1) + , m_gate_enable(false) + , m_gate_select(GATS_HBLNK) + , m_gate_mode(GATM_LOW) + , m_cmp_int_enabled(false) + , m_cmp_int(false) + , m_ovf_int_enabled(false) + , m_ovf_int(false) +{ +} + +void ps2_timer_device::device_start() +{ + if (!m_compare_timer) + m_compare_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(ps2_timer_device::compare), this)); + + if (!m_overflow_timer) + m_overflow_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(ps2_timer_device::overflow), this)); +} + +void ps2_timer_device::device_reset() +{ + m_mode = 0; + + m_last_enable_time = attotime::zero; + m_last_update_time = attotime::zero; + m_elapsed_time = attotime::zero; + + m_enabled = false; + m_zero_return = false; + + m_count = 0; + m_compare = 0; + + m_can_hold = false; + m_hold = 0; + + m_clk_select = CLKS_BUSCLK1; + + m_gate_enable = false; + m_gate_select = GATS_HBLNK; + m_gate_mode = GATM_LOW; + + m_cmp_int_enabled = false; + m_cmp_int = false; + + m_ovf_int_enabled = false; + m_ovf_int = false; + + m_compare_timer->adjust(attotime::never); + m_overflow_timer->adjust(attotime::never); +} + +void ps2_timer_device::update_gate() +{ + // TODO +} + +void ps2_timer_device::update_interrupts() +{ + // TODO +} + +void ps2_timer_device::update_compare_timer() +{ + // TODO +} + +void ps2_timer_device::update_overflow_timer() +{ + // TODO +} + +void ps2_timer_device::update_count() +{ + if (!m_enabled) return; + uint32_t frequency = 0; + + switch (m_clk_select) + { + case CLKS_BUSCLK1: + frequency = clock(); + break; + case CLKS_BUSCLK16: + frequency = clock() / 16; + break; + case CLKS_BUSCLK256: + frequency = clock() / 256; + break; + case CLKS_HBLNK: + frequency = clock() / 18700; + break; + } + + attotime curr_time = machine().scheduler().time(); + attotime time_delta = curr_time - m_last_update_time; + m_last_update_time = curr_time; + m_elapsed_time += time_delta; + uint32_t ticks = (uint32_t)m_elapsed_time.as_ticks(frequency); + if (ticks > 0) + { + m_elapsed_time -= attotime::from_ticks(ticks, frequency); + m_count += ticks; + m_count &= 0xffff; + } +} + +void ps2_timer_device::update_hold() +{ + // TODO +} + +void ps2_timer_device::set_mode(uint32_t data) +{ + static const char *clks_names[4] = { "BUSCLK", "BUSCLK/16", "BUSCLK/256", "HBLNK" }; + static const char *gatm_names[4] = { "low", "reset+rising", "reset+falling", "reset+both" }; + logerror("%s: CLKS=%s, GATE=%d, GATS=%cBLNK\n", machine().describe_context(), clks_names[data & 3], BIT(data, 2), BIT(data, 3) ? 'V' : 'H'); + logerror("%s: GATM=%s, ZRET=%d, CUE=%d\n", machine().describe_context(), gatm_names[(data >> 4) & 3], BIT(data, 6), BIT(data, 7)); + logerror("%s: CMPE=%d, OVFE=%d, %s, %s\n", machine().describe_context(), BIT(data, 8), BIT(data, 9), BIT(data, 10) ? "Clear Equal" : "", BIT(data, 11) ? "Clear Overflow" : ""); + + if (!(data & (MODE_EQUF | MODE_OVFF)) && data == m_mode) return; + + const uint32_t old = m_mode; + m_mode = data; + const uint32_t changed = old ^ data; + + m_clk_select = (timer_clock_select)(data & 3); + m_gate_enable = BIT(data, 2); + m_gate_select = BIT(data, 3) ? GATS_VBLNK : GATS_HBLNK; + m_gate_mode = (timer_gate_mode)((data >> 4) & 3); + m_zero_return = BIT(data, 6); + m_enabled = BIT(data, 7); + + if (changed & (MODE_GATE | MODE_GATS | MODE_GATM)) + { + update_gate(); + } + + if (changed & (MODE_CUE | MODE_CLKS | MODE_ZRET)) + { + update_compare_timer(); + update_overflow_timer(); + } + + if (changed & (MODE_CMPE | MODE_OVFE | MODE_EQUF | MODE_OVFF)) + { + m_cmp_int_enabled = BIT(data, 8); + m_ovf_int_enabled = BIT(data, 9); + m_cmp_int = BIT(data, 10) ? 0 : m_cmp_int; + m_ovf_int = BIT(data, 11) ? 0 : m_ovf_int; + update_interrupts(); + } +} + +TIMER_CALLBACK_MEMBER(ps2_timer_device::compare) +{ +} + +TIMER_CALLBACK_MEMBER(ps2_timer_device::overflow) +{ +} + +READ32_MEMBER(ps2_timer_device::read) +{ + uint32_t ret = 0; + switch (offset) + { + case 0x00: + { + const uint32_t old = m_count; + update_count(); + ret = m_count; + if (old != m_count) + logerror("%s: PS2 timer read: COUNT (%08x & %08x)\n", machine().describe_context(), ret, mem_mask); + break; + } + + case 0x02: + ret = m_mode; + logerror("%s: PS2 timer read: MODE (%08x & %08x)\n", machine().describe_context(), ret, mem_mask); + break; + + case 0x04: + ret = m_compare; + logerror("%s: PS2 timer read: COMP (%08x & %08x)\n", machine().describe_context(), ret, mem_mask); + break; + + case 0x06: + ret = m_hold; + logerror("%s: PS2 timer read: HOLD (%08x & %08x)\n", machine().describe_context(), ret, mem_mask); + break; + + default: + break; + } + return ret; +} + +WRITE32_MEMBER(ps2_timer_device::write) +{ + switch (offset) + { + case 0x00: + m_count = data; + logerror("%s: PS2 timer write: COUNT = %08x & %08x\n", machine().describe_context(), data, mem_mask); + update_compare_timer(); + update_overflow_timer(); + break; + + case 0x02: + set_mode(data); + break; + + case 0x04: + { + logerror("%s: PS2 timer write: COMP = %08x & %08x\n", machine().describe_context(), data, mem_mask); + if (m_compare == data) + break; + + m_compare = data; + update_compare_timer(); + break; + } + + case 0x06: + { + if (!m_can_hold) + break; + + logerror("%s: PS2 timer write: HOLD = %08x & %08x\n", machine().describe_context(), data, mem_mask); + if (m_hold == data) + break; + + m_hold = data; + update_hold(); + break; + } + + default: + break; + } +} |