From 0188ca92a5605c2d5b02752da7d2cbe89e107eeb Mon Sep 17 00:00:00 2001
From: Alexander von Gluck IV <kallisti5@unixzen.com>
Date: Sat, 12 Nov 2011 11:41:31 -0600
Subject: [PATCH] First attempt at older Radeon card support * add missing
 chipset ranges * add a few more older (X1200) PCI ID's (mostly IGP) * add
 code to detect and set frame buffer size on old chipsets * we get to the
 connector detection currently and fail due to the   lack of legacy support on
 my X1200 IGP

---
 .../private/graphics/radeon_hd/radeon_hd.h    |  7 +++++
 .../drivers/graphics/radeon_hd/driver.cpp     |  9 ++++++
 .../drivers/graphics/radeon_hd/radeon_hd.cpp  | 29 ++++++++++++++++++-
 3 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/headers/private/graphics/radeon_hd/radeon_hd.h b/headers/private/graphics/radeon_hd/radeon_hd.h
index 1de16c86ae..0eb4b9df21 100644
--- a/headers/private/graphics/radeon_hd/radeon_hd.h
+++ b/headers/private/graphics/radeon_hd/radeon_hd.h
@@ -52,6 +52,13 @@
 // Radeon Chipsets
 enum radeon_chipset {
 	RADEON_R420 = 0,	//r400, Radeon X700-X850
+	RADEON_R423,
+	RADEON_RV410,
+	RADEON_RS400,
+	RADEON_RS480,
+	RADEON_RS600,
+	RADEON_RS690,
+	RADEON_RS740,
 	RADEON_RV515,
 	RADEON_R520,		//r500, Radeon X1300-X1950
 	RADEON_RV530,
diff --git a/src/add-ons/kernel/drivers/graphics/radeon_hd/driver.cpp b/src/add-ons/kernel/drivers/graphics/radeon_hd/driver.cpp
index 6561c28991..379cc47217 100644
--- a/src/add-ons/kernel/drivers/graphics/radeon_hd/driver.cpp
+++ b/src/add-ons/kernel/drivers/graphics/radeon_hd/driver.cpp
@@ -55,6 +55,15 @@ const struct supported_device {
 	// Introduced: 2005
 	// Codename: Fudo
 	#if 0
+	{0x791e, 1, 0, RADEON_RS690, CHIP_IGP, "Radeon X1200"},
+	{0x791f, 1, 0, RADEON_RS690, CHIP_IGP, "Radeon X1200"},
+	{0x793f, 1, 0, RADEON_RS600, CHIP_IGP, "Radeon X1200"},
+	{0x7941, 1, 0, RADEON_RS600, CHIP_IGP, "Radeon X1200"},
+	{0x7942, 1, 0, RADEON_RS600, CHIP_IGP, "Radeon X1250"},
+	{0x796c, 1, 0, RADEON_RS740, CHIP_IGP, "Radeon RS740"},
+	{0x796d, 1, 0, RADEON_RS740, CHIP_IGP, "Radeon RS740"},
+	{0x796e, 1, 0, RADEON_RS740, CHIP_IGP, "Radeon 2100"},
+	{0x796f, 1, 0, RADEON_RS740, CHIP_IGP, "Radeon RS740"},
 	{0x7140, 1, 0, RADEON_RV515, CHIP_STD, "Radeon X1600"},
 	{0x7100, 1, 0, RADEON_R520,  CHIP_STD, "Radeon X1800"},
 	{0x7104, 1, 0, RADEON_R520,  CHIP_STD, "FireGL v7200"},
diff --git a/src/add-ons/kernel/drivers/graphics/radeon_hd/radeon_hd.cpp b/src/add-ons/kernel/drivers/graphics/radeon_hd/radeon_hd.cpp
index 41dc19fc41..9bc9beb2ab 100644
--- a/src/add-ons/kernel/drivers/graphics/radeon_hd/radeon_hd.cpp
+++ b/src/add-ons/kernel/drivers/graphics/radeon_hd/radeon_hd.cpp
@@ -39,6 +39,13 @@
 
 static const char radeon_chip_name[][16] = {
 	"R420",
+	"R423",
+	"RV410",
+	"RS400",
+	"RS480",
+	"RS600",
+	"RS690",
+	"RS740",
 	"RV515",
 	"R520",
 	"RV530",
@@ -525,10 +532,30 @@ radeon_hd_init(radeon_info &info)
 		// Evergreen+ has memory stored in MB
 		info.shared_info->graphics_memory_size
 			= read32(info.registers + CONFIG_MEMSIZE) * 1024;
-	} else {
+	} else if (info.chipsetID >= RADEON_R600) {
 		// R600-R700 has memory stored in bytes
 		info.shared_info->graphics_memory_size
 			= read32(info.registers + CONFIG_MEMSIZE) / 1024;
+	} else {
+		// R420 - R600 cards
+		// older cards use RADEON_CONFIG_MEMSIZE vs CONFIG_MEMSIZE
+		if ((info.chipsetFlags & CHIP_IGP) != 0) {
+			// NB_TOM holds amount of ram stolen for GPU
+			uint32 tom = read32(info.registers + RADEON_NB_TOM);
+			info.shared_info->graphics_memory_size
+				= (((tom >> 16) - (tom & 0xffff) + 1) << 16);
+			write32(info.registers + RADEON_CONFIG_MEMSIZE,
+				info.shared_info->graphics_memory_size);
+		} else {
+			info.shared_info->graphics_memory_size
+				= read32(info.registers + RADEON_CONFIG_MEMSIZE);
+			if (info.shared_info->graphics_memory_size == 0) {
+				// known bug if video memory == 8MB
+				info.shared_info->graphics_memory_size = 8192;
+				write32(info.registers + RADEON_CONFIG_MEMSIZE,
+					info.shared_info->graphics_memory_size * 1024);
+			}
+		}
 	}
 
 	uint32 barSize = info.pci->u.h0.base_register_sizes[PCI_BAR_FB] / 1024;