Commit e5083a63 authored by Johannes Weiner's avatar Johannes Weiner Committed by Chris Zankel
Browse files

xtensa: nommu support 



Add support for !CONFIG_MMU setups.

Signed-off-by: default avatarJohannes Weiner <jw@emlix.com>
Signed-off-by: default avatarChris Zankel <chris@zankel.net>
parent 7789f89a

arch/xtensa/include/asm/cacheflush.h

+7 −3
Original line number Diff line number Diff line
@@ -65,13 +65,17 @@ extern void __flush_invalidate_dcache_range(unsigned long, unsigned long); 
# define __flush_invalidate_dcache_range(p,s)	__invalidate_dcache_range(p,s)

#endif



#if (DCACHE_WAY_SIZE > PAGE_SIZE)

#if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE)

extern void __flush_invalidate_dcache_page_alias(unsigned long, unsigned long);

#else

static inline void __flush_invalidate_dcache_page_alias(unsigned long virt,

							unsigned long phys) { }

#endif

#if (ICACHE_WAY_SIZE > PAGE_SIZE)

#if defined(CONFIG_MMU) && (ICACHE_WAY_SIZE > PAGE_SIZE)

extern void __invalidate_icache_page_alias(unsigned long, unsigned long);

#else

# define __invalidate_icache_page_alias(v,p)	do { } while(0)

static inline void __invalidate_icache_page_alias(unsigned long virt,

						unsigned long phys) { }

#endif



/*

arch/xtensa/include/asm/dma.h

+2 −1
Original line number Diff line number Diff line
@@ -44,8 +44,9 @@ 
 *	the value desired).

 */



#ifndef MAX_DMA_ADDRESS

#define MAX_DMA_ADDRESS		(PAGE_OFFSET + XCHAL_KIO_SIZE - 1)



#endif



/* Reserve and release a DMA channel */

extern int request_dma(unsigned int dmanr, const char * device_id);

arch/xtensa/include/asm/io.h

+8 −1
Original line number Diff line number Diff line
@@ -69,21 +69,28 @@ static inline void * phys_to_virt(unsigned long address) 


static inline void *ioremap(unsigned long offset, unsigned long size)

{

#ifdef CONFIG_MMU

	if (offset >= XCHAL_KIO_PADDR

	    && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)

		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);



	else

		BUG();

#else

	return (void *)offset;

#endif

}



static inline void *ioremap_nocache(unsigned long offset, unsigned long size)

{

#ifdef CONFIG_MMU

	if (offset >= XCHAL_KIO_PADDR

	    && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)

		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);

	else

		BUG();

#else

	return (void *)offset;

#endif

}



static inline void iounmap(void *addr)

arch/xtensa/include/asm/mmu.h

+5 −0
Original line number Diff line number Diff line
@@ -11,7 +11,12 @@ 
#ifndef _XTENSA_MMU_H

#define _XTENSA_MMU_H



#ifndef CONFIG_MMU

#include <asm/nommu.h>

#else



/* Default "unsigned long" context */

typedef unsigned long mm_context_t;



#endif /* CONFIG_MMU */

#endif	/* _XTENSA_MMU_H */

arch/xtensa/include/asm/mmu_context.h

+5 −0
Original line number Diff line number Diff line
@@ -13,6 +13,10 @@ 
#ifndef _XTENSA_MMU_CONTEXT_H

#define _XTENSA_MMU_CONTEXT_H



#ifndef CONFIG_MMU

#include <asm/nommu_context.h>

#else



#include <linux/stringify.h>

#include <linux/sched.h>
@@ -133,4 +137,5 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) 


}



#endif /* CONFIG_MMU */

#endif /* _XTENSA_MMU_CONTEXT_H */