linux/arch/powerpc/kernel/dma_64.c
Heiko J Schick d7a301033f [PATCH] powerpc: IBMEBUS bus support
This patch adds the necessary core bus support used by device drivers
that sit on the IBM GX bus on modern pSeries machines like the Galaxy
infiniband for example. It provide transparent DMA ops (the low level
driver works with virtual addresses directly) along with a simple bus
layer using the Open Firmware matching routines.

Signed-off-by: Heiko J Schick <schickhj@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-01-09 14:49:06 +11:00

161 lines
3.6 KiB
C

/*
* Copyright (C) 2004 IBM Corporation
*
* Implements the generic device dma API for ppc64. Handles
* the pci and vio busses
*/
#include <linux/device.h>
#include <linux/dma-mapping.h>
/* Include the busses we support */
#include <linux/pci.h>
#include <asm/vio.h>
#include <asm/ibmebus.h>
#include <asm/scatterlist.h>
#include <asm/bug.h>
static struct dma_mapping_ops *get_dma_ops(struct device *dev)
{
#ifdef CONFIG_PCI
if (dev->bus == &pci_bus_type)
return &pci_dma_ops;
#endif
#ifdef CONFIG_IBMVIO
if (dev->bus == &vio_bus_type)
return &vio_dma_ops;
#endif
#ifdef CONFIG_IBMEBUS
if (dev->bus == &ibmebus_bus_type)
return &ibmebus_dma_ops;
#endif
return NULL;
}
int dma_supported(struct device *dev, u64 mask)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
if (dma_ops)
return dma_ops->dma_supported(dev, mask);
BUG();
return 0;
}
EXPORT_SYMBOL(dma_supported);
int dma_set_mask(struct device *dev, u64 dma_mask)
{
#ifdef CONFIG_PCI
if (dev->bus == &pci_bus_type)
return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
#endif
#ifdef CONFIG_IBMVIO
if (dev->bus == &vio_bus_type)
return -EIO;
#endif /* CONFIG_IBMVIO */
#ifdef CONFIG_IBMEBUS
if (dev->bus == &ibmebus_bus_type)
return -EIO;
#endif
BUG();
return 0;
}
EXPORT_SYMBOL(dma_set_mask);
void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
if (dma_ops)
return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
BUG();
return NULL;
}
EXPORT_SYMBOL(dma_alloc_coherent);
void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_handle)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
if (dma_ops)
dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
else
BUG();
}
EXPORT_SYMBOL(dma_free_coherent);
dma_addr_t dma_map_single(struct device *dev, void *cpu_addr, size_t size,
enum dma_data_direction direction)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
if (dma_ops)
return dma_ops->map_single(dev, cpu_addr, size, direction);
BUG();
return (dma_addr_t)0;
}
EXPORT_SYMBOL(dma_map_single);
void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
if (dma_ops)
dma_ops->unmap_single(dev, dma_addr, size, direction);
else
BUG();
}
EXPORT_SYMBOL(dma_unmap_single);
dma_addr_t dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction direction)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
if (dma_ops)
return dma_ops->map_single(dev,
(page_address(page) + offset), size, direction);
BUG();
return (dma_addr_t)0;
}
EXPORT_SYMBOL(dma_map_page);
void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
enum dma_data_direction direction)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
if (dma_ops)
dma_ops->unmap_single(dev, dma_address, size, direction);
else
BUG();
}
EXPORT_SYMBOL(dma_unmap_page);
int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction direction)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
if (dma_ops)
return dma_ops->map_sg(dev, sg, nents, direction);
BUG();
return 0;
}
EXPORT_SYMBOL(dma_map_sg);
void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
enum dma_data_direction direction)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
if (dma_ops)
dma_ops->unmap_sg(dev, sg, nhwentries, direction);
else
BUG();
}
EXPORT_SYMBOL(dma_unmap_sg);