Merge tetrachloride.(none):/mnt/raid/src/kernel/2.5/bk-linus

into tetrachloride.(none):/mnt/raid/src/kernel/2.5/agpgart

drivers/char/agp/Makefile

-agpgart-y := backend.o frontend.o generic.o generic-3.0.o
+agpgart-y := backend.o frontend.o generic.o isoch.o
 
 obj-$(CONFIG_AGP)		+= agpgart.o
 obj-$(CONFIG_AGP_ALI)		+= ali-agp.o

drivers/char/agp/agp.h

@@ -139,6 +139,8 @@ struct agp_bridge_data {
 	int max_memory_agp;	/* in number of pages */
 	int aperture_size_idx;
 	int capndx;
+	char major_version;
+	char minor_version;
 };
 
 #define OUTREG64(mmap, addr, val)	__raw_writeq((val), (mmap)+(addr))
@@ -388,27 +390,38 @@ void agp_free_key(int key);
 int agp_num_entries(void);
 u32 agp_collect_device_status(u32 mode, u32 command);
 void agp_device_command(u32 command, int agp_v3);
-int agp_3_0_node_enable(struct agp_bridge_data *bridge, u32 mode, u32 minor);
+int agp_3_0_enable(struct agp_bridge_data *bridge, u32 mode);
+int agp_3_5_enable(struct agp_bridge_data *bridge, u32 mode);
 void global_cache_flush(void);
+void get_agp_version(struct agp_bridge_data *bridge);
 
 /* Standard agp registers */
 #define AGPSTAT			0x4
 #define AGPCMD			0x8
+#define AGPNISTAT		0xc
 #define AGPNEPG			0x16
+#define AGPNICMD		0x20
 
 #define AGP_MAJOR_VERSION_SHIFT	(20)
 #define AGP_MINOR_VERSION_SHIFT	(16)
 
 #define AGPSTAT_RQ_DEPTH	(0xff000000)
 
+#define AGPSTAT_CAL_MASK	(1<<12|1<<11|1<<10)
+#define AGPSTAT_ARQSZ		(1<<15|1<<14|1<<13)
 #define AGPSTAT_ARQSZ_SHIFT	13
 
-#define AGPSTAT_AGP_ENABLE	(1<<8)
 #define AGPSTAT_SBA		(1<<9)
+#define AGPSTAT_AGP_ENABLE	(1<<8)
+#define AGPSTAT_FW		(1<<4)
+#define AGPSTAT_MODE_3_0	(1<<3)
 
 #define AGPSTAT2_1X		(1<<0)
 #define AGPSTAT2_2X		(1<<1)
 #define AGPSTAT2_4X		(1<<2)
-#define AGPSTAT_FW		(1<<4)
+
+#define AGPSTAT3_RSVD		(1<<2)
+#define AGPSTAT3_8X		(1<<1)
+#define AGPSTAT3_4X		(1)
 
 #endif				/* _AGP_BACKEND_PRIV_H */

drivers/char/agp/amd-k8-agp.c

@@ -253,8 +253,10 @@ static int __init agp_amdk8_probe(struct pci_dev *pdev,
 {
 	struct agp_bridge_data *bridge;
 	struct pci_dev *loop_dev;
+	u8 rev_id;
 	u8 cap_ptr;
 	int i = 0;
+	char *revstring="  ";
 
 	cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 	if (!cap_ptr)
@@ -266,14 +268,38 @@ static int __init agp_amdk8_probe(struct pci_dev *pdev,
 	if (!bridge)
 		return -ENOMEM;
 
+	/* Assume here we have an 8151. (Later this assumption will be fixed). */
+	pci_read_config_byte(pdev, PCI_REVISION_ID, &rev_id);
+	switch (rev_id) {
+		case 0x01:	revstring="A0";
+				break;
+		case 0x02:	revstring="A1";
+				break;
+		case 0x11:	revstring="B0";
+				break;
+		case 0x12:	revstring="B1";
+				break;
+		case 0x13:	revstring="B2";
+				break;
+		default:	revstring="??";
+				break;
+	}
+	printk ("Detected AMD 8151 AGP Bridge rev %s", revstring);
+	/*
+	 * Work around errata.
+	 * Chips before B2 stepping incorrectly reporting v3.5
+	 */
+	if (rev_id < 0x13) {
+		bridge->major_version = 3;
+		bridge->minor_version = 0;
+	}
+
 	bridge->driver = &amd_8151_driver;
 	bridge->dev = pdev;
 	bridge->capndx = cap_ptr;
 
 	/* Fill in the mode register */
-	pci_read_config_dword(pdev,
-			bridge->capndx+PCI_AGP_STATUS,
-			&bridge->mode);
+	pci_read_config_dword(pdev, bridge->capndx+PCI_AGP_STATUS, &bridge->mode);
 
 	/* cache pci_devs of northbridges. */
 	pci_for_each_dev(loop_dev) {
@@ -290,7 +316,7 @@ static int __init agp_amdk8_probe(struct pci_dev *pdev,
 
 	pci_set_drvdata(pdev, bridge);
 	return agp_add_bridge(bridge);
- out_free:
+out_free:
 	agp_put_bridge(bridge);
 	return -ENOMEM;
 }

drivers/char/agp/generic.c

@@ -270,14 +270,16 @@ EXPORT_SYMBOL_GPL(agp_num_entries);
 int agp_copy_info(agp_kern_info * info)
 {
 	memset(info, 0, sizeof(agp_kern_info));
-	if (agp_bridge->type == NOT_SUPPORTED) {
-		info->chipset = agp_bridge->type;
+	if (!agp_bridge || agp_bridge->type == NOT_SUPPORTED ||
+	    !agp_bridge->version) {
+		info->chipset = NOT_SUPPORTED;
 		return -EIO;
 	}
+
 	info->version.major = agp_bridge->version->major;
 	info->version.minor = agp_bridge->version->minor;
-	info->device = agp_bridge->dev;
 	info->chipset = agp_bridge->type;
+	info->device = agp_bridge->dev;
 	info->mode = agp_bridge->mode;
 	info->aper_base = agp_bridge->gart_bus_addr;
 	info->aper_size = agp_return_size();
@@ -366,60 +368,106 @@ EXPORT_SYMBOL(agp_unbind_memory);
 
 
 /* Generic Agp routines - Start */
+static void agp_v2_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
+{
+	/* disable SBA if it's not supported */
+	if (!((*cmd & AGPSTAT_SBA) && (*tmp & AGPSTAT_SBA) && (*mode & AGPSTAT_SBA)))
+		*cmd &= ~AGPSTAT_SBA;
+
+	/* disable FW if it's not supported */
+	if (!((*cmd & AGPSTAT_FW) && (*tmp & AGPSTAT_FW) && (*mode & AGPSTAT_FW)))
+		*cmd &= ~AGPSTAT_FW;
+
+	/* Set speed */
+	if (!((*cmd & AGPSTAT2_4X) && (*tmp & AGPSTAT2_4X) && (*mode & AGPSTAT2_4X)))
+		*cmd &= ~AGPSTAT2_4X;
+
+	if (!((*cmd & AGPSTAT2_2X) && (*tmp & AGPSTAT2_2X) && (*mode & AGPSTAT2_2X)))
+		*cmd &= ~AGPSTAT2_2X;
+
+	if (!((*cmd & AGPSTAT2_1X) && (*tmp & AGPSTAT2_1X) && (*mode & AGPSTAT2_1X)))
+		*cmd &= ~AGPSTAT2_1X;
+
+	/* Now we know what mode it should be, clear out the unwanted bits. */
+	if (*cmd & AGPSTAT2_4X)
+		*cmd &= ~(AGPSTAT2_1X | AGPSTAT2_2X);	/* 4X */
+
+	if (*cmd & AGPSTAT2_2X)
+		*cmd &= ~(AGPSTAT2_1X | AGPSTAT2_4X);	/* 2X */
+
+	if (*cmd & AGPSTAT2_1X)
+		*cmd &= ~(AGPSTAT2_2X | AGPSTAT2_4X);	/* 1Xf */
+}
+
 
-u32 agp_collect_device_status(u32 mode, u32 command)
+static void agp_v3_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
+{
+	/* ARQSZ - Set the value to the maximum one.
+	 * Don't allow the mode register to override values. */
+	*cmd = ((*cmd & ~AGPSTAT_ARQSZ) |
+		max_t(u32,(*cmd & AGPSTAT_ARQSZ),(*tmp & AGPSTAT_ARQSZ)));
+
+	/* Calibration cycle.
+	 * Don't allow the mode register to override values. */
+	*cmd = ((*cmd & ~AGPSTAT_CAL_MASK) |
+		min_t(u32,(*cmd & AGPSTAT_CAL_MASK),(*tmp & AGPSTAT_CAL_MASK)));
+
+	/* SBA *must* be supported for AGP v3 */
+	*cmd |= AGPSTAT_SBA;
+
+	/* disable FW if it's not supported */
+	if (!((*cmd & AGPSTAT_FW) && (*tmp & AGPSTAT_FW) && (*mode & AGPSTAT_FW)))
+		*cmd &= ~AGPSTAT_FW;
+
+	/* Set speed. */
+	if (!((*cmd & AGPSTAT3_8X) && (*tmp & AGPSTAT3_8X) && (*mode & AGPSTAT3_8X)))
+		*cmd &= ~AGPSTAT3_8X;
+
+	if (!((*cmd & AGPSTAT3_4X) && (*tmp & AGPSTAT3_4X) && (*mode & AGPSTAT3_4X)))
+		*cmd &= ~AGPSTAT3_4X;
+
+	/* Clear out unwanted bits. */
+	if (*cmd & AGPSTAT3_8X)
+		*cmd *= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
+	if (*cmd & AGPSTAT3_4X)
+		*cmd *= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
+}
+
+//FIXME: This doesn't smell right.
+//We need a function we pass an agp_device to.
+u32 agp_collect_device_status(u32 mode, u32 cmd)
 {
 	struct pci_dev *device;
-	u8 agp;
-	u32 scratch; 
+	u8 cap_ptr;
+	u32 tmp;
+	u32 agp3;
 
 	pci_for_each_dev(device) {
-		agp = pci_find_capability(device, PCI_CAP_ID_AGP);
-		if (!agp)
+		cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
+		if (!cap_ptr)
 			continue;
 
 		/*
 		 * Ok, here we have a AGP device. Disable impossible 
 		 * settings, and adjust the readqueue to the minimum.
 		 */
-		pci_read_config_dword(device, agp + PCI_AGP_STATUS, &scratch);
+		pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &tmp);
 
 		/* adjust RQ depth */
-		command = ((command & ~AGPSTAT_RQ_DEPTH) |
+		cmd = ((cmd & ~AGPSTAT_RQ_DEPTH) |
 		     min_t(u32, (mode & AGPSTAT_RQ_DEPTH),
-			 min_t(u32, (command & AGPSTAT_RQ_DEPTH),
-			     (scratch & AGPSTAT_RQ_DEPTH))));
-
-		/* disable SBA if it's not supported */
-		if (!((command & AGPSTAT_SBA) && (scratch & AGPSTAT_SBA) && (mode & AGPSTAT_SBA)))
-			command &= ~AGPSTAT_SBA;
-
-		/* disable FW if it's not supported */
-		if (!((command & AGPSTAT_FW) && (scratch & AGPSTAT_FW) && (mode & AGPSTAT_FW)))
-			command &= ~AGPSTAT_FW;
-
-		/* Set speed */
-		if (!((command & AGPSTAT2_4X) && (scratch & AGPSTAT2_4X) && (mode & AGPSTAT2_4X)))
-			command &= ~AGPSTAT2_4X;
+			 min_t(u32, (cmd & AGPSTAT_RQ_DEPTH), (tmp & AGPSTAT_RQ_DEPTH))));
+		
+		pci_read_config_dword(device, cap_ptr+AGPSTAT, &agp3);
 
-		if (!((command & AGPSTAT2_2X) && (scratch & AGPSTAT2_2X) && (mode & AGPSTAT2_2X)))
-			command &= ~AGPSTAT2_2X;
-
-		if (!((command & AGPSTAT2_1X) && (scratch & AGPSTAT2_1X) && (mode & AGPSTAT2_1X)))
-			command &= ~AGPSTAT2_1X;
+		/* Check to see if we are operating in 3.0 mode */
+		if (agp3 & AGPSTAT_MODE_3_0) {
+			agp_v3_parse_one(&mode, &cmd, &tmp);
+		} else {
+			agp_v2_parse_one(&mode, &cmd, &tmp);
+		}
 	}
-
-	/* Now we know what mode it should be, clear out the unwanted bits. */
-	if (command & AGPSTAT2_4X)
-		command &= ~(AGPSTAT2_1X | AGPSTAT2_2X);	/* 4X */
-
-	if (command & AGPSTAT2_2X)
-		command &= ~(AGPSTAT2_1X | AGPSTAT2_4X);	/* 2X */
-
-	if (command & AGPSTAT2_1X)
-		command &= ~(AGPSTAT2_2X | AGPSTAT2_4X);	/* 1Xf */
-
-	return command;
+	return cmd;
 }
 EXPORT_SYMBOL(agp_collect_device_status);
 
@@ -446,29 +494,33 @@ void agp_device_command(u32 command, int agp_v3)
 EXPORT_SYMBOL(agp_device_command);
 
 
-void agp_generic_enable(u32 mode)
+void get_agp_version(struct agp_bridge_data *bridge)
 {
-	u32 command, ncapid, major, minor;
+	u32 ncapid;
+
+	/* Exit early if already set by errata workarounds. */
+	if (agp_bridge->major_version != 0)
+		return;
 
 	pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx, &ncapid);
-	major = (ncapid >> 20) & 0xf;
-	minor = (ncapid >> 16) & 0xf;
-	printk(KERN_INFO PFX "Found an AGP %d.%d compliant device.\n",major, minor);
+	agp_bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
+	agp_bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
+}
+EXPORT_SYMBOL(get_agp_version);
 
-	if(major >= 3) {
-		u32 agp_3_0;
 
-		pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx + 0x4, &agp_3_0);
-		/* Check to see if we are operating in 3.0 mode */
-		if((agp_3_0 >> 3) & 0x1) {
-			agp_3_0_node_enable(agp_bridge, mode, minor);
-			return;
-		} else {
-			printk (KERN_INFO PFX "not in AGP 3.0 mode, falling back to 2.x\n");
-		}
-	}
+void agp_generic_enable(u32 mode)
+{
+	u32 command;
+	u32 agp3;
+
+	get_agp_version(agp_bridge);
+
+	printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
+				agp_bridge->major_version,
+				agp_bridge->minor_version,
+				agp_bridge->dev->slot_name);
 
-	/* AGP v<3 */
 	pci_read_config_dword(agp_bridge->dev,
 		      agp_bridge->capndx + PCI_AGP_STATUS, &command);
 
@@ -477,7 +529,27 @@ void agp_generic_enable(u32 mode)
 
 	pci_write_config_dword(agp_bridge->dev,
 		       agp_bridge->capndx + PCI_AGP_COMMAND, command);
-	agp_device_command(command, 0);
+
+	/* Do AGP version specific frobbing. */
+	if(agp_bridge->major_version >= 3) {
+		pci_read_config_dword(agp_bridge->dev,
+			agp_bridge->capndx+AGPSTAT, &agp3);
+
+		/* Check to see if we are operating in 3.0 mode */
+		if (agp3 & AGPSTAT_MODE_3_0) {
+			/* If we have 3.5, we can do the isoch stuff. */
+			if (agp_bridge->minor_version >= 5)
+				agp_3_5_enable(agp_bridge, mode);
+			agp_device_command(command, TRUE);
+			return;
+		} else {
+			printk (KERN_INFO PFX "Device is in legacy mode,"
+				" falling back to 2.x\n");
+		}
+	}
+
+	/* AGP v<3 */
+	agp_device_command(command, FALSE);
 }
 EXPORT_SYMBOL(agp_generic_enable);
 
@@ -831,6 +903,7 @@ void agp_enable(u32 mode)
 }
 EXPORT_SYMBOL(agp_enable);
 
+
 #ifdef CONFIG_SMP
 static void ipi_handler(void *null)
 {