[ALPHA] AGP infrastructure for AGP implemented in Alpha corelogic

(Titan / Marvel), Kconfig and headers.

From Jeff Wiedemeier.

arch/alpha/Kconfig

@@ -303,6 +303,11 @@ config PCI
 	  information about which PCI hardware does work under Linux and which
 	  doesn't.
 
+config ALPHA_CORE_AGP
+	bool
+	depends on ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL
+	default y
+
 config ALPHA_NONAME
 	bool
 	depends on ALPHA_BOOK1 || ALPHA_NONAME_CH

include/asm-alpha/agp.h

 #ifndef AGP_H
 #define AGP_H 1
 
+#include <asm/io.h>
+
 /* dummy for now */
 
 #define map_page_into_agp(page) 

include/asm-alpha/agp_backend.h

+#ifndef _ALPHA_AGP_BACKEND_H
+#define _ALPHA_AGP_BACKEND_H 1
+
+typedef	union _alpha_agp_mode {
+	struct {
+		u32 rate : 3;
+		u32 reserved0 : 1;
+		u32 fw : 1;
+		u32 fourgb : 1;
+		u32 reserved1 : 2;
+		u32 enable : 1;
+		u32 sba : 1;
+		u32 reserved2 : 14;
+		u32 rq : 8;
+	} bits;
+	u32 lw;
+} alpha_agp_mode;
+
+typedef struct _alpha_agp_info {
+	enum chipset_type type;
+	struct pci_controller *hose;
+	struct {
+		dma_addr_t bus_base;
+		unsigned long size;
+		void *sysdata;
+	} aperture;
+	alpha_agp_mode capability;
+	alpha_agp_mode mode;
+	void *private;
+	struct alpha_agp_ops *ops;
+} alpha_agp_info;
+
+struct alpha_agp_ops {
+	int (*setup)(alpha_agp_info *);
+	void (*cleanup)(alpha_agp_info *);
+	int (*configure)(alpha_agp_info *);
+	int (*bind)(alpha_agp_info *, off_t, agp_memory *);
+	int (*unbind)(alpha_agp_info *, off_t, agp_memory *);
+	unsigned long (*translate)(alpha_agp_info *, dma_addr_t);
+};
+
+
+#endif /* _ALPHA_AGP_BACKEND_H */

include/asm-alpha/machvec.h

@@ -22,6 +22,7 @@ struct linux_hose_info;
 struct pci_dev;
 struct pci_ops;
 struct pci_controller;
+struct _alpha_agp_info;
 
 struct alpha_machine_vector
 {
@@ -91,6 +92,8 @@ struct alpha_machine_vector
 	int (*pci_map_irq)(struct pci_dev *, u8, u8);
 	struct pci_ops *pci_ops;
 
+	struct _alpha_agp_info *(*agp_info)(void);
+
 	const char *vector_name;
 
 	/* NUMA information */