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ssb, b43, b43legacy, b44: Rewrite SSB DMA API

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This is a rewrite of the DMA API for SSB devices.
This is needed, because the old (non-existing) "API" made too many bad
assumptions on the API of the host-bus (PCI).
This introduces an almost complete SSB-DMA-API that maps to the lowlevel
bus-API based on the bustype.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michael Buesch
2008-06-20 11:50:29 +02:00
committed by John W. Linville
parent 316af76f34
commit f225763a7d
6 changed files with 336 additions and 152 deletions
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143
include/linux/ssb/ssb.h
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@ -137,9 +137,6 @@ struct ssb_device {
const struct ssb_bus_ops *ops;
struct device *dev;
/* Pointer to the device that has to be used for
* any DMA related operation. */
struct device *dma_dev;
struct ssb_bus *bus;
struct ssb_device_id id;
@ -399,13 +396,151 @@ static inline void ssb_block_write(struct ssb_device *dev, const void *buffer,
#endif /* CONFIG_SSB_BLOCKIO */
/* The SSB DMA API. Use this API for any DMA operation on the device.
* This API basically is a wrapper that calls the correct DMA API for
* the host device type the SSB device is attached to. */
/* Translation (routing) bits that need to be ORed to DMA
* addresses before they are given to a device. */
extern u32 ssb_dma_translation(struct ssb_device *dev);
#define SSB_DMA_TRANSLATION_MASK 0xC0000000
#define SSB_DMA_TRANSLATION_SHIFT 30
extern int ssb_dma_set_mask(struct ssb_device *ssb_dev, u64 mask);
extern int ssb_dma_set_mask(struct ssb_device *dev, u64 mask);
extern void * ssb_dma_alloc_consistent(struct ssb_device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp_flags);
extern void ssb_dma_free_consistent(struct ssb_device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
gfp_t gfp_flags);
static inline void __cold __ssb_dma_not_implemented(struct ssb_device *dev)
{
#ifdef CONFIG_SSB_DEBUG
printk(KERN_ERR "SSB: BUG! Calling DMA API for "
"unsupported bustype %d\n", dev->bus->bustype);
#endif /* DEBUG */
}
static inline int ssb_dma_mapping_error(struct ssb_device *dev, dma_addr_t addr)
{
switch (dev->bus->bustype) {
case SSB_BUSTYPE_PCI:
return pci_dma_mapping_error(addr);
case SSB_BUSTYPE_SSB:
return dma_mapping_error(addr);
default:
__ssb_dma_not_implemented(dev);
}
return -ENOSYS;
}
static inline dma_addr_t ssb_dma_map_single(struct ssb_device *dev, void *p,
size_t size, enum dma_data_direction dir)
{
switch (dev->bus->bustype) {
case SSB_BUSTYPE_PCI:
return pci_map_single(dev->bus->host_pci, p, size, dir);
case SSB_BUSTYPE_SSB:
return dma_map_single(dev->dev, p, size, dir);
default:
__ssb_dma_not_implemented(dev);
}
return 0;
}
static inline void ssb_dma_unmap_single(struct ssb_device *dev, dma_addr_t dma_addr,
size_t size, enum dma_data_direction dir)
{
switch (dev->bus->bustype) {
case SSB_BUSTYPE_PCI:
pci_unmap_single(dev->bus->host_pci, dma_addr, size, dir);
return;
case SSB_BUSTYPE_SSB:
dma_unmap_single(dev->dev, dma_addr, size, dir);
return;
default:
__ssb_dma_not_implemented(dev);
}
}
static inline void ssb_dma_sync_single_for_cpu(struct ssb_device *dev,
dma_addr_t dma_addr,
size_t size,
enum dma_data_direction dir)
{
switch (dev->bus->bustype) {
case SSB_BUSTYPE_PCI:
pci_dma_sync_single_for_cpu(dev->bus->host_pci, dma_addr,
size, dir);
return;
case SSB_BUSTYPE_SSB:
dma_sync_single_for_cpu(dev->dev, dma_addr, size, dir);
return;
default:
__ssb_dma_not_implemented(dev);
}
}
static inline void ssb_dma_sync_single_for_device(struct ssb_device *dev,
dma_addr_t dma_addr,
size_t size,
enum dma_data_direction dir)
{
switch (dev->bus->bustype) {
case SSB_BUSTYPE_PCI:
pci_dma_sync_single_for_device(dev->bus->host_pci, dma_addr,
size, dir);
return;
case SSB_BUSTYPE_SSB:
dma_sync_single_for_device(dev->dev, dma_addr, size, dir);
return;
default:
__ssb_dma_not_implemented(dev);
}
}
static inline void ssb_dma_sync_single_range_for_cpu(struct ssb_device *dev,
dma_addr_t dma_addr,
unsigned long offset,
size_t size,
enum dma_data_direction dir)
{
switch (dev->bus->bustype) {
case SSB_BUSTYPE_PCI:
/* Just sync everything. That's all the PCI API can do. */
pci_dma_sync_single_for_cpu(dev->bus->host_pci, dma_addr,
offset + size, dir);
return;
case SSB_BUSTYPE_SSB:
dma_sync_single_range_for_cpu(dev->dev, dma_addr, offset,
size, dir);
return;
default:
__ssb_dma_not_implemented(dev);
}
}
static inline void ssb_dma_sync_single_range_for_device(struct ssb_device *dev,
dma_addr_t dma_addr,
unsigned long offset,
size_t size,
enum dma_data_direction dir)
{
switch (dev->bus->bustype) {
case SSB_BUSTYPE_PCI:
/* Just sync everything. That's all the PCI API can do. */
pci_dma_sync_single_for_device(dev->bus->host_pci, dma_addr,
offset + size, dir);
return;
case SSB_BUSTYPE_SSB:
dma_sync_single_range_for_device(dev->dev, dma_addr, offset,
size, dir);
return;
default:
__ssb_dma_not_implemented(dev);
}
}
#ifdef CONFIG_SSB_PCIHOST