[MIPS] Remove LIMITED_DMA support

This code was needed only by Jaguar ATX.

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -883,11 +883,6 @@ config GENERIC_ISA_DMA
 config I8259
 	bool
 
-config LIMITED_DMA
-	bool
-	select HIGHMEM
-	select SYS_SUPPORTS_HIGHMEM
-
 config MIPS_BONITO64
 	bool
 

arch/mips/mm/highmem.c

@@ -80,7 +80,6 @@ void __kunmap_atomic(void *kvaddr, enum km_type type)
 	pagefault_enable();
 }
 
-#ifndef CONFIG_LIMITED_DMA
 /*
  * This is the same as kmap_atomic() but can map memory that doesn't
  * have a struct page associated with it.
@@ -99,7 +98,6 @@ void *kmap_atomic_pfn(unsigned long pfn, enum km_type type)
 
 	return (void*) vaddr;
 }
-#endif /* CONFIG_LIMITED_DMA */
 
 struct page *__kmap_atomic_to_page(void *ptr)
 {

arch/mips/mm/init.c

@@ -424,9 +424,6 @@ void __init mem_init(void)
 			continue;
 		}
 		ClearPageReserved(page);
-#ifdef CONFIG_LIMITED_DMA
-		set_page_address(page, lowmem_page_address(page));
-#endif
 		init_page_count(page);
 		__free_page(page);
 		totalhigh_pages++;

include/asm-mips/highmem.h

@@ -48,46 +48,6 @@ extern pte_t *pkmap_page_table;
 extern void * kmap_high(struct page *page);
 extern void kunmap_high(struct page *page);
 
-/*
- * CONFIG_LIMITED_DMA is for systems with DMA limitations such as Momentum's
- * Jaguar ATX.  This option exploits the highmem code in the kernel so is
- * always enabled together with CONFIG_HIGHMEM but at this time doesn't
- * actually add highmem functionality.
- */
-
-#ifdef CONFIG_LIMITED_DMA
-
-/*
- * These are the default functions for the no-highmem case from
- * <linux/highmem.h>
- */
-static inline void *kmap(struct page *page)
-{
-	might_sleep();
-	return page_address(page);
-}
-
-#define kunmap(page) do { (void) (page); } while (0)
-
-static inline void *kmap_atomic(struct page *page, enum km_type type)
-{
-	pagefault_disable();
-	return page_address(page);
-}
-
-static inline void kunmap_atomic(void *kvaddr, enum km_type type)
-{
-	pagefault_enable();
-}
-
-#define kmap_atomic_pfn(pfn, idx) kmap_atomic(pfn_to_page(pfn), (idx))
-
-#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
-
-#define flush_cache_kmaps()	do { } while (0)
-
-#else /* LIMITED_DMA */
-
 extern void *__kmap(struct page *page);
 extern void __kunmap(struct page *page);
 extern void *__kmap_atomic(struct page *page, enum km_type type);
@@ -103,8 +63,6 @@ extern struct page *__kmap_atomic_to_page(void *ptr);
 
 #define flush_cache_kmaps()	flush_cache_all()
 
-#endif /* LIMITED_DMA */
-
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_HIGHMEM_H */

include/asm-mips/page.h

@@ -190,10 +190,6 @@ typedef struct { unsigned long pgprot; } pgprot_t;
 #define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + UNCAC_BASE)
 #define CAC_ADDR(addr)		((addr) - UNCAC_BASE + PAGE_OFFSET)
 
-#ifdef CONFIG_LIMITED_DMA
-#define WANT_PAGE_VIRTUAL
-#endif
-
 #include <asm-generic/memory_model.h>
 #include <asm-generic/page.h>