MIPS: SGI-IP22/28: Use PROM for memory detection

EARLY_PRINTK uses ArcWrite (via prom_putchar) on IP22/28, which needs
to not mess up PROMs data structures. ARC PROM gives out a list of
memory chunks, which are used and which are free. This fixes the
problem of not working early printk.

By using XKPHYS spaces more than 256MB memory on Indigo2 R4k machines
is working now, too.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

arch/mips/include/asm/bootinfo.h

@@ -99,6 +99,7 @@ extern void detect_memory_region(phys_addr_t start, phys_addr_t sz_min,  phys_ad
 
 extern void prom_init(void);
 extern void prom_free_prom_memory(void);
+extern void prom_cleanup(void);
 
 extern void free_init_pages(const char *what,
 			    unsigned long begin, unsigned long end);

arch/mips/include/asm/mach-ip22/spaces.h

@@ -12,15 +12,6 @@
 
 #define PHYS_OFFSET     _AC(0x08000000, UL)
 
-#ifdef CONFIG_64BIT
-
-#define CAC_BASE		0xffffffff80000000
-#define IO_BASE			0xffffffffa0000000
-#define UNCAC_BASE		0xffffffffa0000000
-#define MAP_BASE		0xc000000000000000
-
-#endif /* CONFIG_64BIT */
-
 #include <asm/mach-generic/spaces.h>
 
 #endif /* __ASM_MACH_IP22_SPACES_H */