From 29b35bb6a1cec6af10615ea3d96ce850e8e8edfa Mon Sep 17 00:00:00 2001
From: Ville Linde <villedevs@gmail.com>
Date: Thu, 20 Aug 2015 16:54:53 +0300
Subject: [PATCH] k057714: found yet another fifo (nw)

---
 src/mame/drivers/konendev.c |  1 +
 src/mame/video/k057714.c    | 51 ++++++++++++++++++++++++++++++++++++-
 src/mame/video/k057714.h    |  6 +++++
 3 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/src/mame/drivers/konendev.c b/src/mame/drivers/konendev.c
index 3e3b7607afb..22d1e0570ef 100644
--- a/src/mame/drivers/konendev.c
+++ b/src/mame/drivers/konendev.c
@@ -152,6 +152,7 @@ static ADDRESS_MAP_START( konendev_map, AS_PROGRAM, 32, konendev_state )
 //	AM_RANGE(0x78000000, 0x78000003) AM_READNOP
 //	AM_RANGE(0x78100000, 0x7810001b) AM_RAM
 //	AM_RANGE(0x78a00014, 0x78a00017) AM_WRITENOP
+	AM_RANGE(0x79000000, 0x79000003) AM_DEVWRITE("gcu", k057714_device, fifo_w)
 	AM_RANGE(0x79800000, 0x798000ff) AM_DEVREADWRITE("gcu", k057714_device, read, write)
 	AM_RANGE(0x7a000000, 0x7a01ffff) AM_RAM AM_SHARE("nvram0")
 	AM_RANGE(0x7a100000, 0x7a11ffff) AM_RAM AM_SHARE("nvram1")
diff --git a/src/mame/video/k057714.c b/src/mame/video/k057714.c
index 30b2f932e7a..14cb52a83ba 100644
--- a/src/mame/video/k057714.c
+++ b/src/mame/video/k057714.c
@@ -116,6 +116,14 @@ WRITE32_MEMBER(k057714_device::write)
 		case 0x18:      // ?
 			break;
 
+		case 0x1c:		// set to 1 on "media bus" access
+			if ((data >> 16) == 1)
+			{
+				m_ext_fifo_count = 0;
+				m_ext_fifo_line = 0;
+			}
+			break;
+
 		case 0x20:      // Framebuffer 0 Origin(?)
 			break;
 
@@ -184,6 +192,17 @@ WRITE32_MEMBER(k057714_device::write)
 #endif
 			break;
 
+		case 0x54:
+			if (ACCESSING_BITS_16_31)
+				m_ext_fifo_num_lines = data >> 16;
+			if (ACCESSING_BITS_0_15)
+				m_ext_fifo_width = data & 0xffff;
+			break;
+
+		case 0x58:
+			m_ext_fifo_addr = (data & 0xffffff);
+			break;
+
 		case 0x5c:      // VRAM Read Address
 			m_vram_read_addr = (data & 0xffffff) / 2;
 			break;
@@ -250,11 +269,41 @@ WRITE32_MEMBER(k057714_device::write)
 			break;
 
 		default:
-			//printf("%s_w: %02X, %08X, %08X\n", basetag(), reg, data, mem_mask);
+			//printf("%s_w: %02X, %08X, %08X at %08X\n", basetag(), reg, data, mem_mask, space.device().safe_pc());
 			break;
 	}
 }
 
+WRITE32_MEMBER(k057714_device::fifo_w)
+{
+	if (ACCESSING_BITS_16_31)
+	{
+		if (m_ext_fifo_count != 0)		// first access is a dummy write
+		{
+			int count = m_ext_fifo_count - 1;
+			UINT32 addr = (((m_ext_fifo_addr >> 10) + m_ext_fifo_line) * 1024) + count;
+
+			if ((count & 1) == 0)
+			{
+				m_vram[addr >> 1] &= 0x0000ffff;
+				m_vram[addr >> 1] |= (data & 0xffff0000);
+			}
+			else
+			{
+				m_vram[addr >> 1] &= 0xffff0000;
+				m_vram[addr >> 1] |= (data >> 16);
+			}
+		}
+		m_ext_fifo_count++;
+
+		if (m_ext_fifo_count > m_ext_fifo_width+1)
+		{
+			m_ext_fifo_line++;
+			m_ext_fifo_count = 0;
+		}
+	}
+}
+
 int k057714_device::draw(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
 {
 	UINT16 *vram16 = (UINT16*)m_vram;
diff --git a/src/mame/video/k057714.h b/src/mame/video/k057714.h
index 14f1f432b05..88b03791e57 100644
--- a/src/mame/video/k057714.h
+++ b/src/mame/video/k057714.h
@@ -15,6 +15,7 @@ public:
 
 	DECLARE_READ32_MEMBER(read);
 	DECLARE_WRITE32_MEMBER(write);
+	DECLARE_WRITE32_MEMBER(fifo_w);
 
 	struct framebuffer
 	{
@@ -46,6 +47,11 @@ private:
 	UINT32 m_command_fifo0_ptr;
 	UINT32 m_command_fifo1[4];
 	UINT32 m_command_fifo1_ptr;
+	UINT32 m_ext_fifo_addr;
+	UINT32 m_ext_fifo_count;
+	UINT32 m_ext_fifo_line;
+	UINT32 m_ext_fifo_num_lines;
+	UINT32 m_ext_fifo_width;
 
 	framebuffer m_frame[4];
 	UINT32 m_fb_origin_x;