1fdb24e969
* 'devel-stable' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm: (178 commits) ARM: 7139/1: fix compilation with CONFIG_ARM_ATAG_DTB_COMPAT and large TEXT_OFFSET ARM: gic, local timers: use the request_percpu_irq() interface ARM: gic: consolidate PPI handling ARM: switch from NO_MACH_MEMORY_H to NEED_MACH_MEMORY_H ARM: mach-s5p64x0: remove mach/memory.h ARM: mach-s3c64xx: remove mach/memory.h ARM: plat-mxc: remove mach/memory.h ARM: mach-prima2: remove mach/memory.h ARM: mach-zynq: remove mach/memory.h ARM: mach-bcmring: remove mach/memory.h ARM: mach-davinci: remove mach/memory.h ARM: mach-pxa: remove mach/memory.h ARM: mach-ixp4xx: remove mach/memory.h ARM: mach-h720x: remove mach/memory.h ARM: mach-vt8500: remove mach/memory.h ARM: mach-s5pc100: remove mach/memory.h ARM: mach-tegra: remove mach/memory.h ARM: plat-tcc: remove mach/memory.h ARM: mach-mmp: remove mach/memory.h ARM: mach-cns3xxx: remove mach/memory.h ... Fix up mostly pretty trivial conflicts in: - arch/arm/Kconfig - arch/arm/include/asm/localtimer.h - arch/arm/kernel/Makefile - arch/arm/mach-shmobile/board-ap4evb.c - arch/arm/mach-u300/core.c - arch/arm/mm/dma-mapping.c - arch/arm/mm/proc-v7.S - arch/arm/plat-omap/Kconfig largely due to some CONFIG option renaming (ie CONFIG_PM_SLEEP -> CONFIG_ARM_CPU_SUSPEND for the arm-specific suspend code etc) and addition of NEED_MACH_MEMORY_H next to HAVE_IDE.
474 lines
15 KiB
C
474 lines
15 KiB
C
#ifndef ASMARM_DMA_MAPPING_H
|
|
#define ASMARM_DMA_MAPPING_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/mm_types.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/dma-debug.h>
|
|
|
|
#include <asm-generic/dma-coherent.h>
|
|
#include <asm/memory.h>
|
|
|
|
#ifdef __arch_page_to_dma
|
|
#error Please update to __arch_pfn_to_dma
|
|
#endif
|
|
|
|
/*
|
|
* dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
|
|
* functions used internally by the DMA-mapping API to provide DMA
|
|
* addresses. They must not be used by drivers.
|
|
*/
|
|
#ifndef __arch_pfn_to_dma
|
|
static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
|
|
{
|
|
return (dma_addr_t)__pfn_to_bus(pfn);
|
|
}
|
|
|
|
static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
|
|
{
|
|
return __bus_to_pfn(addr);
|
|
}
|
|
|
|
static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
|
|
{
|
|
return (void *)__bus_to_virt((unsigned long)addr);
|
|
}
|
|
|
|
static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
|
|
{
|
|
return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
|
|
}
|
|
#else
|
|
static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
|
|
{
|
|
return __arch_pfn_to_dma(dev, pfn);
|
|
}
|
|
|
|
static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
|
|
{
|
|
return __arch_dma_to_pfn(dev, addr);
|
|
}
|
|
|
|
static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
|
|
{
|
|
return __arch_dma_to_virt(dev, addr);
|
|
}
|
|
|
|
static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
|
|
{
|
|
return __arch_virt_to_dma(dev, addr);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* The DMA API is built upon the notion of "buffer ownership". A buffer
|
|
* is either exclusively owned by the CPU (and therefore may be accessed
|
|
* by it) or exclusively owned by the DMA device. These helper functions
|
|
* represent the transitions between these two ownership states.
|
|
*
|
|
* Note, however, that on later ARMs, this notion does not work due to
|
|
* speculative prefetches. We model our approach on the assumption that
|
|
* the CPU does do speculative prefetches, which means we clean caches
|
|
* before transfers and delay cache invalidation until transfer completion.
|
|
*
|
|
* Private support functions: these are not part of the API and are
|
|
* liable to change. Drivers must not use these.
|
|
*/
|
|
static inline void __dma_single_cpu_to_dev(const void *kaddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
extern void ___dma_single_cpu_to_dev(const void *, size_t,
|
|
enum dma_data_direction);
|
|
|
|
if (!arch_is_coherent())
|
|
___dma_single_cpu_to_dev(kaddr, size, dir);
|
|
}
|
|
|
|
static inline void __dma_single_dev_to_cpu(const void *kaddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
extern void ___dma_single_dev_to_cpu(const void *, size_t,
|
|
enum dma_data_direction);
|
|
|
|
if (!arch_is_coherent())
|
|
___dma_single_dev_to_cpu(kaddr, size, dir);
|
|
}
|
|
|
|
static inline void __dma_page_cpu_to_dev(struct page *page, unsigned long off,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
extern void ___dma_page_cpu_to_dev(struct page *, unsigned long,
|
|
size_t, enum dma_data_direction);
|
|
|
|
if (!arch_is_coherent())
|
|
___dma_page_cpu_to_dev(page, off, size, dir);
|
|
}
|
|
|
|
static inline void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
extern void ___dma_page_dev_to_cpu(struct page *, unsigned long,
|
|
size_t, enum dma_data_direction);
|
|
|
|
if (!arch_is_coherent())
|
|
___dma_page_dev_to_cpu(page, off, size, dir);
|
|
}
|
|
|
|
extern int dma_supported(struct device *, u64);
|
|
extern int dma_set_mask(struct device *, u64);
|
|
|
|
/*
|
|
* DMA errors are defined by all-bits-set in the DMA address.
|
|
*/
|
|
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
|
|
{
|
|
return dma_addr == ~0;
|
|
}
|
|
|
|
/*
|
|
* Dummy noncoherent implementation. We don't provide a dma_cache_sync
|
|
* function so drivers using this API are highlighted with build warnings.
|
|
*/
|
|
static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
|
|
dma_addr_t *handle, gfp_t gfp)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void dma_free_noncoherent(struct device *dev, size_t size,
|
|
void *cpu_addr, dma_addr_t handle)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* dma_alloc_coherent - allocate consistent memory for DMA
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @size: required memory size
|
|
* @handle: bus-specific DMA address
|
|
*
|
|
* Allocate some uncached, unbuffered memory for a device for
|
|
* performing DMA. This function allocates pages, and will
|
|
* return the CPU-viewed address, and sets @handle to be the
|
|
* device-viewed address.
|
|
*/
|
|
extern void *dma_alloc_coherent(struct device *, size_t, dma_addr_t *, gfp_t);
|
|
|
|
/**
|
|
* dma_free_coherent - free memory allocated by dma_alloc_coherent
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @size: size of memory originally requested in dma_alloc_coherent
|
|
* @cpu_addr: CPU-view address returned from dma_alloc_coherent
|
|
* @handle: device-view address returned from dma_alloc_coherent
|
|
*
|
|
* Free (and unmap) a DMA buffer previously allocated by
|
|
* dma_alloc_coherent().
|
|
*
|
|
* References to memory and mappings associated with cpu_addr/handle
|
|
* during and after this call executing are illegal.
|
|
*/
|
|
extern void dma_free_coherent(struct device *, size_t, void *, dma_addr_t);
|
|
|
|
/**
|
|
* dma_mmap_coherent - map a coherent DMA allocation into user space
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @vma: vm_area_struct describing requested user mapping
|
|
* @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
|
|
* @handle: device-view address returned from dma_alloc_coherent
|
|
* @size: size of memory originally requested in dma_alloc_coherent
|
|
*
|
|
* Map a coherent DMA buffer previously allocated by dma_alloc_coherent
|
|
* into user space. The coherent DMA buffer must not be freed by the
|
|
* driver until the user space mapping has been released.
|
|
*/
|
|
int dma_mmap_coherent(struct device *, struct vm_area_struct *,
|
|
void *, dma_addr_t, size_t);
|
|
|
|
|
|
/**
|
|
* dma_alloc_writecombine - allocate writecombining memory for DMA
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @size: required memory size
|
|
* @handle: bus-specific DMA address
|
|
*
|
|
* Allocate some uncached, buffered memory for a device for
|
|
* performing DMA. This function allocates pages, and will
|
|
* return the CPU-viewed address, and sets @handle to be the
|
|
* device-viewed address.
|
|
*/
|
|
extern void *dma_alloc_writecombine(struct device *, size_t, dma_addr_t *,
|
|
gfp_t);
|
|
|
|
#define dma_free_writecombine(dev,size,cpu_addr,handle) \
|
|
dma_free_coherent(dev,size,cpu_addr,handle)
|
|
|
|
int dma_mmap_writecombine(struct device *, struct vm_area_struct *,
|
|
void *, dma_addr_t, size_t);
|
|
|
|
/*
|
|
* This can be called during boot to increase the size of the consistent
|
|
* DMA region above it's default value of 2MB. It must be called before the
|
|
* memory allocator is initialised, i.e. before any core_initcall.
|
|
*/
|
|
extern void __init init_consistent_dma_size(unsigned long size);
|
|
|
|
|
|
#ifdef CONFIG_DMABOUNCE
|
|
/*
|
|
* For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
|
|
* and utilize bounce buffers as needed to work around limited DMA windows.
|
|
*
|
|
* On the SA-1111, a bug limits DMA to only certain regions of RAM.
|
|
* On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
|
|
* On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
|
|
*
|
|
* The following are helper functions used by the dmabounce subystem
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* dmabounce_register_dev
|
|
*
|
|
* @dev: valid struct device pointer
|
|
* @small_buf_size: size of buffers to use with small buffer pool
|
|
* @large_buf_size: size of buffers to use with large buffer pool (can be 0)
|
|
* @needs_bounce_fn: called to determine whether buffer needs bouncing
|
|
*
|
|
* This function should be called by low-level platform code to register
|
|
* a device as requireing DMA buffer bouncing. The function will allocate
|
|
* appropriate DMA pools for the device.
|
|
*/
|
|
extern int dmabounce_register_dev(struct device *, unsigned long,
|
|
unsigned long, int (*)(struct device *, dma_addr_t, size_t));
|
|
|
|
/**
|
|
* dmabounce_unregister_dev
|
|
*
|
|
* @dev: valid struct device pointer
|
|
*
|
|
* This function should be called by low-level platform code when device
|
|
* that was previously registered with dmabounce_register_dev is removed
|
|
* from the system.
|
|
*
|
|
*/
|
|
extern void dmabounce_unregister_dev(struct device *);
|
|
|
|
/*
|
|
* The DMA API, implemented by dmabounce.c. See below for descriptions.
|
|
*/
|
|
extern dma_addr_t __dma_map_page(struct device *, struct page *,
|
|
unsigned long, size_t, enum dma_data_direction);
|
|
extern void __dma_unmap_page(struct device *, dma_addr_t, size_t,
|
|
enum dma_data_direction);
|
|
|
|
/*
|
|
* Private functions
|
|
*/
|
|
int dmabounce_sync_for_cpu(struct device *, dma_addr_t, unsigned long,
|
|
size_t, enum dma_data_direction);
|
|
int dmabounce_sync_for_device(struct device *, dma_addr_t, unsigned long,
|
|
size_t, enum dma_data_direction);
|
|
#else
|
|
static inline int dmabounce_sync_for_cpu(struct device *d, dma_addr_t addr,
|
|
unsigned long offset, size_t size, enum dma_data_direction dir)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline int dmabounce_sync_for_device(struct device *d, dma_addr_t addr,
|
|
unsigned long offset, size_t size, enum dma_data_direction dir)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
|
|
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)
|
|
{
|
|
__dma_page_cpu_to_dev(page, offset, size, dir);
|
|
return pfn_to_dma(dev, page_to_pfn(page)) + offset;
|
|
}
|
|
|
|
static inline void __dma_unmap_page(struct device *dev, dma_addr_t handle,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
__dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)),
|
|
handle & ~PAGE_MASK, size, dir);
|
|
}
|
|
#endif /* CONFIG_DMABOUNCE */
|
|
|
|
/**
|
|
* dma_map_single - map a single buffer for streaming DMA
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @cpu_addr: CPU direct mapped address of buffer
|
|
* @size: size of buffer to map
|
|
* @dir: DMA transfer direction
|
|
*
|
|
* Ensure that any data held in the cache is appropriately discarded
|
|
* or written back.
|
|
*
|
|
* The device owns this memory once this call has completed. The CPU
|
|
* can regain ownership by calling dma_unmap_single() or
|
|
* dma_sync_single_for_cpu().
|
|
*/
|
|
static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
unsigned long offset;
|
|
struct page *page;
|
|
dma_addr_t addr;
|
|
|
|
BUG_ON(!virt_addr_valid(cpu_addr));
|
|
BUG_ON(!virt_addr_valid(cpu_addr + size - 1));
|
|
BUG_ON(!valid_dma_direction(dir));
|
|
|
|
page = virt_to_page(cpu_addr);
|
|
offset = (unsigned long)cpu_addr & ~PAGE_MASK;
|
|
addr = __dma_map_page(dev, page, offset, size, dir);
|
|
debug_dma_map_page(dev, page, offset, size, dir, addr, true);
|
|
|
|
return addr;
|
|
}
|
|
|
|
/**
|
|
* dma_map_page - map a portion of a page for streaming DMA
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @page: page that buffer resides in
|
|
* @offset: offset into page for start of buffer
|
|
* @size: size of buffer to map
|
|
* @dir: DMA transfer direction
|
|
*
|
|
* Ensure that any data held in the cache is appropriately discarded
|
|
* or written back.
|
|
*
|
|
* The device owns this memory once this call has completed. The CPU
|
|
* can regain ownership by calling dma_unmap_page().
|
|
*/
|
|
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)
|
|
{
|
|
dma_addr_t addr;
|
|
|
|
BUG_ON(!valid_dma_direction(dir));
|
|
|
|
addr = __dma_map_page(dev, page, offset, size, dir);
|
|
debug_dma_map_page(dev, page, offset, size, dir, addr, false);
|
|
|
|
return addr;
|
|
}
|
|
|
|
/**
|
|
* dma_unmap_single - unmap a single buffer previously mapped
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @handle: DMA address of buffer
|
|
* @size: size of buffer (same as passed to dma_map_single)
|
|
* @dir: DMA transfer direction (same as passed to dma_map_single)
|
|
*
|
|
* Unmap a single streaming mode DMA translation. The handle and size
|
|
* must match what was provided in the previous dma_map_single() call.
|
|
* All other usages are undefined.
|
|
*
|
|
* After this call, reads by the CPU to the buffer are guaranteed to see
|
|
* whatever the device wrote there.
|
|
*/
|
|
static inline void dma_unmap_single(struct device *dev, dma_addr_t handle,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
debug_dma_unmap_page(dev, handle, size, dir, true);
|
|
__dma_unmap_page(dev, handle, size, dir);
|
|
}
|
|
|
|
/**
|
|
* dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @handle: DMA address of buffer
|
|
* @size: size of buffer (same as passed to dma_map_page)
|
|
* @dir: DMA transfer direction (same as passed to dma_map_page)
|
|
*
|
|
* Unmap a page streaming mode DMA translation. The handle and size
|
|
* must match what was provided in the previous dma_map_page() call.
|
|
* All other usages are undefined.
|
|
*
|
|
* After this call, reads by the CPU to the buffer are guaranteed to see
|
|
* whatever the device wrote there.
|
|
*/
|
|
static inline void dma_unmap_page(struct device *dev, dma_addr_t handle,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
debug_dma_unmap_page(dev, handle, size, dir, false);
|
|
__dma_unmap_page(dev, handle, size, dir);
|
|
}
|
|
|
|
/**
|
|
* dma_sync_single_range_for_cpu
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @handle: DMA address of buffer
|
|
* @offset: offset of region to start sync
|
|
* @size: size of region to sync
|
|
* @dir: DMA transfer direction (same as passed to dma_map_single)
|
|
*
|
|
* Make physical memory consistent for a single streaming mode DMA
|
|
* translation after a transfer.
|
|
*
|
|
* If you perform a dma_map_single() but wish to interrogate the
|
|
* buffer using the cpu, yet do not wish to teardown the PCI dma
|
|
* mapping, you must call this function before doing so. At the
|
|
* next point you give the PCI dma address back to the card, you
|
|
* must first the perform a dma_sync_for_device, and then the
|
|
* device again owns the buffer.
|
|
*/
|
|
static inline void dma_sync_single_range_for_cpu(struct device *dev,
|
|
dma_addr_t handle, unsigned long offset, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
BUG_ON(!valid_dma_direction(dir));
|
|
|
|
debug_dma_sync_single_for_cpu(dev, handle + offset, size, dir);
|
|
|
|
if (!dmabounce_sync_for_cpu(dev, handle, offset, size, dir))
|
|
return;
|
|
|
|
__dma_single_dev_to_cpu(dma_to_virt(dev, handle) + offset, size, dir);
|
|
}
|
|
|
|
static inline void dma_sync_single_range_for_device(struct device *dev,
|
|
dma_addr_t handle, unsigned long offset, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
BUG_ON(!valid_dma_direction(dir));
|
|
|
|
debug_dma_sync_single_for_device(dev, handle + offset, size, dir);
|
|
|
|
if (!dmabounce_sync_for_device(dev, handle, offset, size, dir))
|
|
return;
|
|
|
|
__dma_single_cpu_to_dev(dma_to_virt(dev, handle) + offset, size, dir);
|
|
}
|
|
|
|
static inline void dma_sync_single_for_cpu(struct device *dev,
|
|
dma_addr_t handle, size_t size, enum dma_data_direction dir)
|
|
{
|
|
dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
|
|
}
|
|
|
|
static inline void dma_sync_single_for_device(struct device *dev,
|
|
dma_addr_t handle, size_t size, enum dma_data_direction dir)
|
|
{
|
|
dma_sync_single_range_for_device(dev, handle, 0, size, dir);
|
|
}
|
|
|
|
/*
|
|
* The scatter list versions of the above methods.
|
|
*/
|
|
extern int dma_map_sg(struct device *, struct scatterlist *, int,
|
|
enum dma_data_direction);
|
|
extern void dma_unmap_sg(struct device *, struct scatterlist *, int,
|
|
enum dma_data_direction);
|
|
extern void dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
|
|
enum dma_data_direction);
|
|
extern void dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
|
|
enum dma_data_direction);
|
|
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif
|