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Diffstat (limited to 'src/devices/cpu/sh/sh_intc.cpp')
-rw-r--r-- | src/devices/cpu/sh/sh_intc.cpp | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/devices/cpu/sh/sh_intc.cpp b/src/devices/cpu/sh/sh_intc.cpp new file mode 100644 index 00000000000..989cc8d62a1 --- /dev/null +++ b/src/devices/cpu/sh/sh_intc.cpp @@ -0,0 +1,151 @@ +// license:BSD-3-Clause +// copyright-holders:Olivier Galibert +/*************************************************************************** + + sh_intc.cpp + + SH interrupt controllers family + +***************************************************************************/ + +#include "emu.h" +#include "sh_intc.h" + +#include "sh7042.h" + +DEFINE_DEVICE_TYPE(SH_INTC, sh_intc_device, "sh_intc", "SH interrupt controller") + +const u8 sh_intc_device::pribit[0x100] = { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 1, 2, 3, 4, 5, 6, 7, 8, 8, 8, 8, 9, 9, 9, 9, + 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, + 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, + 18, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, + 22, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 24, 25, 25, 25, 25, + 26, 26, 26, 26, 27, 27, 27, 27, 28, 28, 28, 28, 29, 29, 29, 29, + 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, + 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, + 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, + 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, + 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, + 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, +}; + +sh_intc_device::sh_intc_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : + device_t(mconfig, SH_INTC, tag, owner, clock), + m_cpu(*this, finder_base::DUMMY_TAG) +{ +} + +void sh_intc_device::device_start() +{ + save_item(NAME(m_ipr)); + save_item(NAME(m_icr)); + save_item(NAME(m_isr)); + save_item(NAME(m_pending)); + save_item(NAME(m_lines)); + + std::fill(m_ipr.begin(), m_ipr.end(), 0); + m_isr = 0; + m_icr = 0; + m_lines = 0; +} + +void sh_intc_device::device_reset() +{ + std::fill(m_pending.begin(), m_pending.end(), 0); +} + +void sh_intc_device::interrupt_taken(int irqline, int vector) +{ + // Don't clear an external interrupt which is level and still active + if(vector < 64 || vector >= 72 || BIT(m_icr, 7-(vector & 7)) || !BIT(m_lines, vector & 7)) + m_pending[vector >> 5] &= ~(1 << (vector & 31)); + + update_irq(); +} + +void sh_intc_device::update_irq() +{ + int best_level = -1; + int best_vector = 0; + + for(u32 bv = 64/32; bv != 160/32; bv ++) { + if(!m_pending[bv]) + continue; + for(u32 iv = 0; iv != 32; iv++) { + if(!BIT(m_pending[bv], iv)) + continue; + u32 vector = bv*32 + iv; + u32 slot = pribit[vector]; + u32 shift = 12-4*(slot & 3); + int level = (m_ipr[slot >> 2] >> shift) & 15; + if(level > best_level) { + best_level = level; + best_vector = vector; + } + } + } + m_cpu->set_internal_interrupt(best_level, best_vector); +} + +void sh_intc_device::internal_interrupt(int vector) +{ + m_pending[vector >> 5] |= 1 << (vector & 31); + update_irq(); +} + +void sh_intc_device::set_input(int inputnum, int state) +{ + if(BIT(m_lines, inputnum) == state) + return; + if(BIT(m_icr, 7-inputnum)) { + // Level interrupt + if(state) + m_pending[64 >> 5] |= 1 << inputnum; + else + m_pending[64 >> 5] &= ~(1 << inputnum); + } else { + // Edge interrupt + if(state) + m_pending[64 >> 5] |= 1 << inputnum; + } + update_irq(); +} + +u16 sh_intc_device::icr_r() +{ + return m_icr; +} + +void sh_intc_device::icr_w(offs_t, u16 data, u16 mem_mask) +{ + COMBINE_DATA(&m_icr); + logerror("icr_w %04x @ %04x\n", data, mem_mask); +} + +u16 sh_intc_device::isr_r() +{ + return m_isr; +} + +void sh_intc_device::isr_w(offs_t, u16 data, u16 mem_mask) +{ + COMBINE_DATA(&m_isr); + logerror("isr_w %04x @ %04x\n", data, mem_mask); +} + +u16 sh_intc_device::ipr_r(offs_t offset) +{ + return m_ipr[offset]; +} + +void sh_intc_device::ipr_w(offs_t offset, u16 data, u16 mem_mask) +{ + COMBINE_DATA(&m_ipr[offset]); + logerror("ipr_w %x, %04x @ %04x\n", offset, data, mem_mask); +} + |