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

ARC: I/O and DMA Mappings

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent fbd7053a
/*
* 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
/*
* 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
/*
* 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 */
/*
* 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);
/*
* 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);
/*
* 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.
*
* vineetg: Feb 2009
* -For AA4 board, kernel to DMA address APIs
*/
/*
* kernel addresses are 0x800_000 based, while Bus addr are 0 based
*/
#ifndef __PLAT_DMA_ADDR_H
#define __PLAT_DMA_ADDR_H
#include <linux/device.h>
static inline unsigned long plat_dma_addr_to_kernel(struct device *dev,
dma_addr_t dma_addr)
{
return dma_addr + PAGE_OFFSET;
}
static inline dma_addr_t plat_kernel_addr_to_dma(struct device *dev, void *ptr)
{
unsigned long addr = (unsigned long)ptr;
/*
* To Catch buggy drivers which can call DMA map API with kernel vaddr
* i.e. for buffers alloc via vmalloc or ioremap which are not
* gaurnateed to be PHY contiguous and hence unfit for DMA anyways.
* On ARC kernel virtual address is 0x7000_0000 to 0x7FFF_FFFF, so
* ideally we want to check this range here, but our implementation is
* better as it checks for even worse user virtual address as well.
*/
if (likely(addr >= PAGE_OFFSET))
return addr - PAGE_OFFSET;
BUG();
return addr;
}
#endif
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