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Commit 1162b070 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: I/O and DMA Mappings 



Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent fbd7053a

arch/arc/include/asm/dma-mapping.h

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/*

 * DMA Mapping glue for ARC

 *

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#ifndef ASM_ARC_DMA_MAPPING_H

#define ASM_ARC_DMA_MAPPING_H



#include <asm-generic/dma-coherent.h>

#include <asm/cacheflush.h>

#include <plat/dma_addr.h>



void *dma_alloc_noncoherent(struct device *dev, size_t size,

			    dma_addr_t *dma_handle, gfp_t gfp);



void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,

			  dma_addr_t dma_handle);



void *dma_alloc_coherent(struct device *dev, size_t size,

			 dma_addr_t *dma_handle, gfp_t gfp);



void dma_free_coherent(struct device *dev, size_t size, void *kvaddr,

		       dma_addr_t dma_handle);



/* drivers/base/dma-mapping.c */

extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,

			   void *cpu_addr, dma_addr_t dma_addr, size_t size);

extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,

				  void *cpu_addr, dma_addr_t dma_addr,

				  size_t size);



#define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)

#define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)



/*

 * streaming DMA Mapping API...

 * CPU accesses page via normal paddr, thus needs to explicitly made

 * consistent before each use

 */



static inline void __inline_dma_cache_sync(unsigned long paddr, size_t size,

					   enum dma_data_direction dir)

{

	switch (dir) {

	case DMA_FROM_DEVICE:

		dma_cache_inv(paddr, size);

		break;

	case DMA_TO_DEVICE:

		dma_cache_wback(paddr, size);

		break;

	case DMA_BIDIRECTIONAL:

		dma_cache_wback_inv(paddr, size);

		break;

	default:

		pr_err("Invalid DMA dir [%d] for OP @ %lx\n", dir, paddr);

	}

}



void __arc_dma_cache_sync(unsigned long paddr, size_t size,

			  enum dma_data_direction dir);



#define _dma_cache_sync(addr, sz, dir)			\

do {							\

	if (__builtin_constant_p(dir))			\

		__inline_dma_cache_sync(addr, sz, dir);	\

	else						\

		__arc_dma_cache_sync(addr, sz, dir);	\

}							\

while (0);



static inline dma_addr_t

dma_map_single(struct device *dev, void *cpu_addr, size_t size,

	       enum dma_data_direction dir)

{

	_dma_cache_sync((unsigned long)cpu_addr, size, dir);

	return plat_kernel_addr_to_dma(dev, cpu_addr);

}



static inline void

dma_unmap_single(struct device *dev, dma_addr_t dma_addr,

		 size_t size, enum dma_data_direction dir)

{

}



static inline dma_addr_t

dma_map_page(struct device *dev, struct page *page,

	     unsigned long offset, size_t size,

	     enum dma_data_direction dir)

{

	unsigned long paddr = page_to_phys(page) + offset;

	return dma_map_single(dev, (void *)paddr, size, dir);

}



static inline void

dma_unmap_page(struct device *dev, dma_addr_t dma_handle,

	       size_t size, enum dma_data_direction dir)

{

}



static inline int

dma_map_sg(struct device *dev, struct scatterlist *sg,

	   int nents, enum dma_data_direction dir)

{

	struct scatterlist *s;

	int i;



	for_each_sg(sg, s, nents, i)

		sg->dma_address = dma_map_page(dev, sg_page(s), s->offset,

					       s->length, dir);



	return nents;

}



static inline void

dma_unmap_sg(struct device *dev, struct scatterlist *sg,

	     int nents, enum dma_data_direction dir)

{

	struct scatterlist *s;

	int i;



	for_each_sg(sg, s, nents, i)

		dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir);

}



static inline void

dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,

			size_t size, enum dma_data_direction dir)

{

	_dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle), size,

			DMA_FROM_DEVICE);

}



static inline void

dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,

			   size_t size, enum dma_data_direction dir)

{

	_dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle), size,

			DMA_TO_DEVICE);

}



static inline void

dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,

			      unsigned long offset, size_t size,

			      enum dma_data_direction direction)

{

	_dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle) + offset,

			size, DMA_FROM_DEVICE);

}



static inline void

dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,

				 unsigned long offset, size_t size,

				 enum dma_data_direction direction)

{

	_dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle) + offset,

			size, DMA_TO_DEVICE);

}



static inline void

dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,

		    enum dma_data_direction dir)

{

	int i;



	for (i = 0; i < nelems; i++, sg++)

		_dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);

}



static inline void

dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,

		       enum dma_data_direction dir)

{

	int i;



	for (i = 0; i < nelems; i++, sg++)

		_dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);

}



static inline int dma_supported(struct device *dev, u64 dma_mask)

{

	/* Support 32 bit DMA mask exclusively */

	return dma_mask == DMA_BIT_MASK(32);

}



static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)

{

	return 0;

}



static inline int dma_set_mask(struct device *dev, u64 dma_mask)

{

	if (!dev->dma_mask || !dma_supported(dev, dma_mask))

		return -EIO;



	*dev->dma_mask = dma_mask;



	return 0;

}



#endif

arch/arc/include/asm/dma.h

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/*

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#ifndef ASM_ARC_DMA_H

#define ASM_ARC_DMA_H



#define MAX_DMA_ADDRESS 0xC0000000



#endif

arch/arc/include/asm/io.h

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/*

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#ifndef _ASM_ARC_IO_H

#define _ASM_ARC_IO_H



#include <linux/types.h>

#include <asm/byteorder.h>

#include <asm/page.h>



#define PCI_IOBASE ((void __iomem *)0)



extern void __iomem *ioremap(unsigned long physaddr, unsigned long size);

extern void iounmap(const void __iomem *addr);



#define ioremap_nocache(phy, sz)	ioremap(phy, sz)

#define ioremap_wc(phy, sz)		ioremap(phy, sz)



/* Change struct page to physical address */

#define page_to_phys(page)		(page_to_pfn(page) << PAGE_SHIFT)



#define __raw_readb __raw_readb

static inline u8 __raw_readb(const volatile void __iomem *addr)

{

	u8 b;



	__asm__ __volatile__(

	"	ldb%U1 %0, %1	\n"

	: "=r" (b)

	: "m" (*(volatile u8 __force *)addr)

	: "memory");



	return b;

}



#define __raw_readw __raw_readw

static inline u16 __raw_readw(const volatile void __iomem *addr)

{

	u16 s;



	__asm__ __volatile__(

	"	ldw%U1 %0, %1	\n"

	: "=r" (s)

	: "m" (*(volatile u16 __force *)addr)

	: "memory");



	return s;

}



#define __raw_readl __raw_readl

static inline u32 __raw_readl(const volatile void __iomem *addr)

{

	u32 w;



	__asm__ __volatile__(

	"	ld%U1 %0, %1	\n"

	: "=r" (w)

	: "m" (*(volatile u32 __force *)addr)

	: "memory");



	return w;

}



#define __raw_writeb __raw_writeb

static inline void __raw_writeb(u8 b, volatile void __iomem *addr)

{

	__asm__ __volatile__(

	"	stb%U1 %0, %1	\n"

	:

	: "r" (b), "m" (*(volatile u8 __force *)addr)

	: "memory");

}



#define __raw_writew __raw_writew

static inline void __raw_writew(u16 s, volatile void __iomem *addr)

{

	__asm__ __volatile__(

	"	stw%U1 %0, %1	\n"

	:

	: "r" (s), "m" (*(volatile u16 __force *)addr)

	: "memory");



}



#define __raw_writel __raw_writel

static inline void __raw_writel(u32 w, volatile void __iomem *addr)

{

	__asm__ __volatile__(

	"	st%U1 %0, %1	\n"

	:

	: "r" (w), "m" (*(volatile u32 __force *)addr)

	: "memory");



}



#include <asm-generic/io.h>



#endif /* _ASM_ARC_IO_H */

arch/arc/mm/dma.c

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/*

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



/*

 * DMA Coherent API Notes

 *

 * I/O is inherently non-coherent on ARC. So a coherent DMA buffer is

 * implemented by accessintg it using a kernel virtual address, with

 * Cache bit off in the TLB entry.

 *

 * The default DMA address == Phy address which is 0x8000_0000 based.

 * A platform/device can make it zero based, by over-riding

 * plat_{dma,kernel}_addr_to_{kernel,dma}

 */



#include <linux/dma-mapping.h>

#include <linux/dma-debug.h>

#include <linux/export.h>

#include <asm/cacheflush.h>



/*

 * Helpers for Coherent DMA API.

 */

void *dma_alloc_noncoherent(struct device *dev, size_t size,

			    dma_addr_t *dma_handle, gfp_t gfp)

{

	void *paddr;



	/* This is linear addr (0x8000_0000 based) */

	paddr = alloc_pages_exact(size, gfp);

	if (!paddr)

		return NULL;



	/* This is bus address, platform dependent */

	*dma_handle = plat_kernel_addr_to_dma(dev, paddr);



	return paddr;

}

EXPORT_SYMBOL(dma_alloc_noncoherent);



void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,

			  dma_addr_t dma_handle)

{

	free_pages_exact((void *)plat_dma_addr_to_kernel(dev, dma_handle),

			 size);

}

EXPORT_SYMBOL(dma_free_noncoherent);



void *dma_alloc_coherent(struct device *dev, size_t size,

			 dma_addr_t *dma_handle, gfp_t gfp)

{

	void *paddr, *kvaddr;



	/* This is linear addr (0x8000_0000 based) */

	paddr = alloc_pages_exact(size, gfp);

	if (!paddr)

		return NULL;



	/* This is kernel Virtual address (0x7000_0000 based) */

	kvaddr = ioremap_nocache((unsigned long)paddr, size);

	if (kvaddr != NULL)

		memset(kvaddr, 0, size);



	/* This is bus address, platform dependent */

	*dma_handle = plat_kernel_addr_to_dma(dev, paddr);



	return kvaddr;

}

EXPORT_SYMBOL(dma_alloc_coherent);



void dma_free_coherent(struct device *dev, size_t size, void *kvaddr,

		       dma_addr_t dma_handle)

{

	iounmap((void __force __iomem *)kvaddr);



	free_pages_exact((void *)plat_dma_addr_to_kernel(dev, dma_handle),

			 size);

}

EXPORT_SYMBOL(dma_free_coherent);



/*

 * Helper for streaming DMA...

 */

void __arc_dma_cache_sync(unsigned long paddr, size_t size,

			  enum dma_data_direction dir)

{

	__inline_dma_cache_sync(paddr, size, dir);

}

EXPORT_SYMBOL(__arc_dma_cache_sync);

arch/arc/mm/ioremap.c

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/*

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/vmalloc.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/io.h>

#include <linux/mm.h>

#include <linux/slab.h>

#include <asm/cache.h>



void __iomem *ioremap(unsigned long paddr, unsigned long size)

{

	unsigned long vaddr;

	struct vm_struct *area;

	unsigned long off, end;

	const pgprot_t prot = PAGE_KERNEL_NO_CACHE;



	/* Don't allow wraparound or zero size */

	end = paddr + size - 1;

	if (!size || (end < paddr))

		return NULL;



	/* If the region is h/w uncached, nothing special needed */

	if (paddr >= ARC_UNCACHED_ADDR_SPACE)

		return (void __iomem *)paddr;



	/* An early platform driver might end up here */

	if (!slab_is_available())

		return NULL;



	/* Mappings have to be page-aligned, page-sized */

	off = paddr & ~PAGE_MASK;

	paddr &= PAGE_MASK;

	size = PAGE_ALIGN(end + 1) - paddr;



	/*

	 * Ok, go for it..

	 */

	area = get_vm_area(size, VM_IOREMAP);

	if (!area)

		return NULL;



	area->phys_addr = paddr;

	vaddr = (unsigned long)area->addr;

	if (ioremap_page_range(vaddr, vaddr + size, paddr, prot)) {

		vfree(area->addr);

		return NULL;

	}



	return (void __iomem *)(off + (char __iomem *)vaddr);

}

EXPORT_SYMBOL(ioremap);



void iounmap(const void __iomem *addr)

{

	if (addr >= (void __force __iomem *)ARC_UNCACHED_ADDR_SPACE)

		return;



	vfree((void *)(PAGE_MASK & (unsigned long __force)addr));

}

EXPORT_SYMBOL(iounmap);