skeleton/flashvga2.cpp: map i2c EEPROM and Timekeeper

src/mame/skeleton/flashvga2.cpp

@@ -6,7 +6,8 @@
 "Flash VGA 2" hardware (from TourVisión?) for video-slots.
 
 TODO:
-- Currently fails on timekeeper check ("error en reloj");
+- Currently fails on timekeeper check ("error en reloj"), does extensive checks in the empty
+  dump area;
 
 ===================================================================================================
 
@@ -55,6 +56,7 @@ TODO:
 #include "emu.h"
 
 #include "cpu/i86/i186.h"
+#include "machine/i2cmem.h"
 #include "machine/mc68681.h"
 #include "machine/timekpr.h"
 
@@ -80,6 +82,7 @@ public:
 		, m_palette(*this, "palette")
 		, m_program_bank(*this, "program_bank")
 		, m_vram(*this, "vram")
+		, m_eeprom(*this, "eeprom")
 	{ }
 
 	void flashvga2(machine_config &config);
@@ -97,6 +100,7 @@ private:
 	required_device<palette_device> m_palette;
 	required_memory_bank m_program_bank;
 	required_shared_ptr<u16> m_vram;
+	required_device<i2c_24c256_device> m_eeprom;
 
 	void mem_map(address_map &map);
 	void io_map(address_map &map);
@@ -134,25 +138,40 @@ uint32_t flashvga2_state::screen_update(screen_device &screen, bitmap_ind16 &bit
 
 void flashvga2_state::mem_map(address_map &map)
 {
-	map(0x00000, 0x3ffff).ram();
+	map(0x00000, 0x30fff).ram();
+	// TODO: check limits and parallelism (access in 8-bit only?)
+	map(0x30000, 0x31fff).rw("rtc", FUNC(m48t02_device::read), FUNC(m48t02_device::write)).umask16(0x00ff);
+	map(0x32000, 0x3ffff).ram();
 	map(0x40000, 0x7ffff).ram().share("vram");
 	// TODO: several zero writes in this area (flash ROM side-effect?)
-	map(0x80000, 0xbffff).bankr("program_bank");
+	map(0x80000, 0xbffff).bankr("program_bank").lw16(NAME([this] (offs_t offset, u16 data, u16 mem_mask) {
+		if (data)
+			LOG("Warning: write at [%05x] %04x & %04x\n", offset * 2 + 0x80000, data, mem_mask);
+	}));
 	map(0xc0000, 0xfffff).rom().region("program_rom", 0x7c0000);
 }
 
 void flashvga2_state::io_map(address_map &map)
 {
 	map(0x2000, 0x201f).rw("uart", FUNC(scn2681_device::read), FUNC(scn2681_device::write)).umask16(0x00ff);
-	map(0x2178, 0x2179).portr("IN0");
+	map(0x2176, 0x2177).nopw();
-	map(0x217a, 0x217b).portr("IN1");
+	map(0x2178, 0x2179).portr("IN0").nopw();
+	map(0x217a, 0x217b).portr("IN1").nopw();
 	map(0x2180, 0x2180).lw8(NAME([this] (offs_t offset, u8 data) {
 		// assumed, currently selects pages 7 and 8 only
 		m_program_bank->set_entry(data & 0x1f);
 		if (data & 0xe0)
 			LOG("$2180: write %02x\n", data);
 	}));
-//  map(0x2184, 0x2184) i2c style protocol
+	map(0x2184, 0x2184).lrw8(
+		NAME([this] (offs_t offset) {
+			return m_eeprom->read_sda();
+		}),
+		NAME([this] (offs_t offset, u8 data) {
+			m_eeprom->write_scl(BIT(data, 1));
+			m_eeprom->write_sda(BIT(data, 0));
+		})
+	);
 }
 
 static INPUT_PORTS_START(ruletamag)
@@ -232,7 +251,9 @@ void flashvga2_state::flashvga2(machine_config &config)
 	scn2681_device &uart(SCN2681(config, "uart", 3.6864_MHz_XTAL)); // Philips SCC2692AC1A44
 	uart.irq_cb().set_inputline(m_maincpu, INPUT_LINE_NMI);
 
-	M48T02(config, "m48t18", 0); // ST M48T18-150PC1
+	M48T02(config, "rtc", 0); // ST M48T18-150PC1
+
+	I2C_24C256(config, m_eeprom, 0);
 
 	// TODO: refine, is it really 60 Hz?
 	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
@@ -259,14 +280,27 @@ ROM_START( ruletamag )
 	ROM_LOAD16_BYTE( "m29f032d.u100", 0x000000, 0x400000, CRC(04bf20c2) SHA1(fc4be2c22dc266d6a460aeca257b449be5ab630f) )
 	ROM_LOAD16_BYTE( "m29f032d.u101", 0x000001, 0x400000, CRC(2bd85284) SHA1(36f4b918d1d9b57bf382fa940180b3a1aac9780f) )
 
-	ROM_REGION( 0x8000, "seeprom", 0 )
+	ROM_REGION( 0x8000, "eeprom", 0 )
 	ROM_LOAD( "m24256bf.u31",  0x000000, 0x008000, CRC(af9adcae) SHA1(ac6274edc4240d5cf397455868009263264ffc6e) )
 
 	/* With an unintialized NVRAM/timekeeper, the machine won't work and Will output just a "ERROR EN RELOJ" message.
 	       With the included dump (corrupted), it will output the message "ERROR EN MODULO", but still won't boot.
 	       Maybe there's a way to initialize the NVRAM, but there's nothing about it on the manual. */
-	ROM_REGION( 0x2000, "nvram", 0 )
+	ROM_REGION( 0x2000, "rtc", 0 )
 	ROM_LOAD( "m48t18.u38",    0x000000, 0x002000, BAD_DUMP CRC(025fb8c2) SHA1(61c90ecad8565cfd20674034a5917b0225edbfe5) ) // Corrupted
+	// patch checks at PC=d3299 onward
+	ROM_FILL( 0x0044 >> 1, 1, 0x55 )
+	ROM_FILL( 0x0046 >> 1, 1, 0xaa )
+	// checksum for 0x48 ~ 0x5c
+	ROM_FILL( 0x005e >> 1, 1, 0xf4 )
+	ROM_FILL( 0x0060 >> 1, 1, 0x0b )
+
+	// does further checks if this skipped (going back to "error en reloj")
+//	ROM_FILL( 0x00b0 >> 1, 1, 0x55 )
+//	ROM_FILL( 0x00b2 >> 1, 1, 0xaa )
+
+//	ROM_FILL( 0x0008 >> 1, 1, 0x71 )
+//	ROM_FILL( 0x000a >> 1, 1, 0xac )
 ROM_END