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Diffstat (limited to 'src/emu/machine/lpc-rtc.c')
-rw-r--r--src/emu/machine/lpc-rtc.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/src/emu/machine/lpc-rtc.c b/src/emu/machine/lpc-rtc.c
new file mode 100644
index 00000000000..c296504d1a6
--- /dev/null
+++ b/src/emu/machine/lpc-rtc.c
@@ -0,0 +1,81 @@
+#include "lpc-rtc.h"
+
+const device_type LPC_RTC = &device_creator<lpc_rtc_device>;
+
+DEVICE_ADDRESS_MAP_START(map, 32, lpc_rtc_device)
+ AM_RANGE(0x70, 0x77) AM_READWRITE8(index_r, index_w, 0x00ff00ff)
+ AM_RANGE(0x70, 0x77) AM_READWRITE8(target_r, target_w, 0xff00ff00)
+ADDRESS_MAP_END
+
+DEVICE_ADDRESS_MAP_START(extmap, 32, lpc_rtc_device)
+ AM_RANGE(0x70, 0x77) AM_READWRITE8(extindex_r, extindex_w, 0x00ff0000)
+ AM_RANGE(0x70, 0x77) AM_READWRITE8(exttarget_r, exttarget_w, 0xff000000)
+ADDRESS_MAP_END
+
+lpc_rtc_device::lpc_rtc_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : lpc_device(mconfig, LPC_RTC, "LPC RTC", tag, owner, clock, "lpc_rtc", __FILE__)
+{
+}
+
+void lpc_rtc_device::map_device(UINT64 memory_window_start, UINT64 memory_window_end, UINT64 memory_offset, address_space *memory_space,
+ UINT64 io_window_start, UINT64 io_window_end, UINT64 io_offset, address_space *io_space)
+{
+ io_space->install_device(io_offset, io_window_end, *this, &lpc_rtc_device::map);
+}
+
+void lpc_rtc_device::map_extdevice(UINT64 memory_window_start, UINT64 memory_window_end, UINT64 memory_offset, address_space *memory_space,
+ UINT64 io_window_start, UINT64 io_window_end, UINT64 io_offset, address_space *io_space)
+{
+ io_space->install_device(io_offset, io_window_end, *this, &lpc_rtc_device::extmap);
+}
+
+void lpc_rtc_device::device_start()
+{
+ memset(ram, 0, 256);
+}
+
+void lpc_rtc_device::device_reset()
+{
+}
+
+READ8_MEMBER( lpc_rtc_device::index_r)
+{
+ return cur_index;
+}
+
+WRITE8_MEMBER( lpc_rtc_device::index_w)
+{
+ cur_index = data & 0x7f;
+}
+
+READ8_MEMBER( lpc_rtc_device::target_r)
+{
+ return ram[cur_index];
+}
+
+WRITE8_MEMBER( lpc_rtc_device::target_w)
+{
+ ram[cur_index] = data;
+ logerror("%s: ram[%02x] = %02x\n", tag(), cur_index, data);
+}
+
+READ8_MEMBER( lpc_rtc_device::extindex_r)
+{
+ return cur_extindex;
+}
+
+WRITE8_MEMBER( lpc_rtc_device::extindex_w)
+{
+ cur_extindex = data & 0x7f;
+}
+
+READ8_MEMBER( lpc_rtc_device::exttarget_r)
+{
+ return ram[cur_extindex|128];
+}
+
+WRITE8_MEMBER( lpc_rtc_device::exttarget_w)
+{
+ ram[cur_extindex|128] = data;
+ logerror("%s: ram[%02x] = %02x\n", tag(), cur_extindex|128, data);
+}