radeon: add support for reverse engineered xpress200m

The IGPGART setup code was traced using mmio-trace on fglrx by myself
and Phillip Ezolt <phillipezolt@gmail.com> on dri-devel.

This code doesn't let the 3D driver work properly as the card has no
vertex shader support.

Thanks to Matthew Garrett + Ubuntu for providing me some hardware to do this
work on.

1 files changed, 62 insertions, 4 deletions

diff --git a/shared-core/radeon_cp.c b/shared-core/radeon_cp.c
index e02796e7..a741eb7f 100644
--- a/shared-core/radeon_cp.c
+++ b/shared-core/radeon_cp.c
@@ -824,12 +824,21 @@ static int RADEON_READ_PLL(drm_device_t * dev, int addr)
 	return RADEON_READ(RADEON_CLOCK_CNTL_DATA);
 }
 
-static int RADEON_READ_PCIE(drm_radeon_private_t *dev_priv, int addr)
+static u32 RADEON_READ_PCIE(drm_radeon_private_t *dev_priv, int addr)
 {
 	RADEON_WRITE8(RADEON_PCIE_INDEX, addr & 0xff);
 	return RADEON_READ(RADEON_PCIE_DATA);
 }
 
+static u32 RADEON_READ_IGPGART(drm_radeon_private_t *dev_priv, int addr)
+{
+	u32 ret;
+	RADEON_WRITE(RADEON_IGPGART_INDEX, addr & 0x7f);
+	ret = RADEON_READ(RADEON_IGPGART_DATA);
+	RADEON_WRITE(RADEON_IGPGART_INDEX, 0x7f);
+	return ret;
+}
+
 #if RADEON_FIFO_DEBUG
 static void radeon_status(drm_radeon_private_t * dev_priv)
 {
@@ -1266,7 +1275,45 @@ static void radeon_test_writeback(drm_radeon_private_t * dev_priv)
 	}
 }
 
-/* Enable or disable PCI-E GART on the chip */
+/* Enable or disable IGP GART on the chip */
+static void radeon_set_igpgart(drm_radeon_private_t * dev_priv, int on)
+{
+	u32 temp, tmp;
+
+	tmp = RADEON_READ(RADEON_AIC_CNTL);
+	DRM_DEBUG("setting igpgart AIC CNTL is %08X\n", tmp);
+	if (on) {
+		DRM_DEBUG("programming igpgart %08X %08lX %08X\n",
+			 dev_priv->gart_vm_start,
+			 (long)dev_priv->gart_info.bus_addr,
+			 dev_priv->gart_size);
+
+		RADEON_WRITE_IGPGART(RADEON_IGPGART_UNK_18, 0x1000);
+		RADEON_WRITE_IGPGART(RADEON_IGPGART_UNK_38, 0x1);
+		RADEON_WRITE_IGPGART(RADEON_IGPGART_CTRL, 0x42040800);
+		RADEON_WRITE_IGPGART(RADEON_IGPGART_BASE_ADDR,
+				     dev_priv->gart_info.bus_addr);
+
+		temp = RADEON_READ_IGPGART(dev_priv, RADEON_IGPGART_UNK_39);
+		RADEON_WRITE_IGPGART(RADEON_IGPGART_UNK_39, temp);
+
+		RADEON_WRITE(RADEON_AGP_BASE, (unsigned int)dev_priv->gart_vm_start);
+		dev_priv->gart_size = 32*1024*1024;
+		RADEON_WRITE(RADEON_MC_AGP_LOCATION,
+			     (((dev_priv->gart_vm_start - 1 +
+			       dev_priv->gart_size) & 0xffff0000) |
+			     (dev_priv->gart_vm_start >> 16)));
+
+		temp = RADEON_READ_IGPGART(dev_priv, RADEON_IGPGART_UNK_38);
+		RADEON_WRITE_IGPGART(RADEON_IGPGART_UNK_38, temp);
+
+		RADEON_READ_IGPGART(dev_priv, RADEON_IGPGART_UNK_2E);
+		RADEON_WRITE_IGPGART(RADEON_IGPGART_UNK_2E, 0x1);
+		RADEON_READ_IGPGART(dev_priv, RADEON_IGPGART_UNK_2E);
+		RADEON_WRITE_IGPGART(RADEON_IGPGART_UNK_2E, 0x0);
+       }
+}
+
 static void radeon_set_pciegart(drm_radeon_private_t * dev_priv, int on)
 {
 	u32 tmp = RADEON_READ_PCIE(dev_priv, RADEON_PCIE_TX_GART_CNTL);
@@ -1301,6 +1348,11 @@ static void radeon_set_pcigart(drm_radeon_private_t * dev_priv, int on)
 {
 	u32 tmp;
 
+	if (dev_priv->flags & RADEON_IS_IGPGART) {
+		radeon_set_igpgart(dev_priv, on);
+		return;
+	}
+
 	if (dev_priv->flags & RADEON_IS_PCIE) {
 		radeon_set_pciegart(dev_priv, on);
 		return;
@@ -1635,8 +1687,10 @@ static int radeon_do_init_cp(drm_device_t * dev, drm_radeon_init_t * init)
 			dev_priv->gart_info.addr =
 			    dev_priv->gart_info.mapping.handle;
 
-			dev_priv->gart_info.is_pcie =
-			    !!(dev_priv->flags & RADEON_IS_PCIE);
+			if (dev_priv->flags & RADEON_IS_PCIE)
+				dev_priv->gart_info.gart_reg_if = DRM_ATI_GART_PCIE;
+			else
+				dev_priv->gart_info.gart_reg_if = DRM_ATI_GART_PCI;
 			dev_priv->gart_info.gart_table_location =
 			    DRM_ATI_GART_FB;
 
@@ -1644,6 +1698,10 @@ static int radeon_do_init_cp(drm_device_t * dev, drm_radeon_init_t * init)
 				  dev_priv->gart_info.addr,
 				  dev_priv->pcigart_offset);
 		} else {
+			if (dev_priv->flags & RADEON_IS_IGPGART)
+				dev_priv->gart_info.gart_reg_if = DRM_ATI_GART_IGP;
+			else
+				dev_priv->gart_info.gart_reg_if = DRM_ATI_GART_PCI;
 			dev_priv->gart_info.gart_table_location =
 			    DRM_ATI_GART_MAIN;
 			dev_priv->gart_info.addr = NULL;