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powerpc: Merge 32 and 64-bit dma code

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We essentially adopt the 64-bit dma code, with some changes to support
32-bit systems, including HIGHMEM.  dma functions on 32-bit are now
invoked via accessor functions which call the correct op for a device based
on archdata dma_ops.  If there is no archdata dma_ops, this defaults
to dma_direct_ops.

In addition, the dma_map/unmap_page functions are added to dma_ops
because we can't just fall back on map/unmap_single when HIGHMEM is
enabled. In the case of dma_direct_*, we stop using map/unmap_single
and just use the page version - this saves a lot of ugly
ifdeffing.  We leave map/unmap_single in the dma_ops definition,
though, because they are needed by the iommu code, which does not
implement map/unmap_page.  Ideally, going forward, we will completely
eliminate map/unmap_single and just have map/unmap_page, if it's
workable for 64-bit.

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Becky Bruce
2008-09-12 10:34:46 +00:00
committed by Kumar Gala
parent 8fae035324
commit 4fc665b88a
8 changed files with 175 additions and 205 deletions
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4
arch/powerpc/kernel/Makefile
View File

@@ -70,10 +70,10 @@ extra-$(CONFIG_8xx) := head_8xx.o
extra-y += vmlinux.lds
obj-y += time.o prom.o traps.o setup-common.o \
udbg.o misc.o io.o \
udbg.o misc.o io.o dma.o \
misc_$(CONFIG_WORD_SIZE).o
obj-$(CONFIG_PPC32) += entry_32.o setup_32.o
obj-$(CONFIG_PPC64) += dma.o dma-iommu.o iommu.o
obj-$(CONFIG_PPC64) += dma-iommu.o iommu.o
obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_PPC_MULTIPLATFORM) += prom_init.o
obj-$(CONFIG_MODULES) += ppc_ksyms.o

69
arch/powerpc/kernel/dma.c
View File

@@ -16,21 +16,30 @@
* This implementation supports a per-device offset that can be applied if
* the address at which memory is visible to devices is not 0. Platform code
* can set archdata.dma_data to an unsigned long holding the offset. By
* default the offset is zero.
* default the offset is PCI_DRAM_OFFSET.
*/
static unsigned long get_dma_direct_offset(struct device *dev)
{
return (unsigned long)dev->archdata.dma_data;
if (dev)
return (unsigned long)dev->archdata.dma_data;
return PCI_DRAM_OFFSET;
}
static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
void *dma_direct_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
#ifdef CONFIG_NOT_COHERENT_CACHE
return __dma_alloc_coherent(size, dma_handle, flag);
#else
struct page *page;
void *ret;
int node = dev_to_node(dev);
/* ignore region specifiers */
flag &= ~(__GFP_HIGHMEM);
page = alloc_pages_node(node, flag, get_order(size));
if (page == NULL)
return NULL;
@@ -39,27 +48,17 @@ static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
*dma_handle = virt_to_abs(ret) + get_dma_direct_offset(dev);
return ret;
#endif
}
static void dma_direct_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle)
void dma_direct_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
#ifdef CONFIG_NOT_COHERENT_CACHE
__dma_free_coherent(size, vaddr);
#else
free_pages((unsigned long)vaddr, get_order(size));
}
static dma_addr_t dma_direct_map_single(struct device *dev, void *ptr,
size_t size,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
return virt_to_abs(ptr) + get_dma_direct_offset(dev);
}
static void dma_direct_unmap_single(struct device *dev, dma_addr_t dma_addr,
size_t size,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
#endif
}
static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
@@ -85,20 +84,44 @@ static void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sg,
static int dma_direct_dma_supported(struct device *dev, u64 mask)
{
#ifdef CONFIG_PPC64
/* Could be improved to check for memory though it better be
* done via some global so platforms can set the limit in case
* they have limited DMA windows
*/
return mask >= DMA_32BIT_MASK;
#else
return 1;
#endif
}
static inline dma_addr_t dma_direct_map_page(struct device *dev,
struct page *page,
unsigned long offset,
size_t size,
enum dma_data_direction dir,
struct dma_attrs *attrs)
{
BUG_ON(dir == DMA_NONE);
__dma_sync_page(page, offset, size, dir);
return page_to_phys(page) + offset + get_dma_direct_offset(dev);
}
static inline void dma_direct_unmap_page(struct device *dev,
dma_addr_t dma_address,
size_t size,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
}
struct dma_mapping_ops dma_direct_ops = {
.alloc_coherent = dma_direct_alloc_coherent,
.free_coherent = dma_direct_free_coherent,
.map_single = dma_direct_map_single,
.unmap_single = dma_direct_unmap_single,
.map_sg = dma_direct_map_sg,
.unmap_sg = dma_direct_unmap_sg,
.dma_supported = dma_direct_dma_supported,
.map_page = dma_direct_map_page,
.unmap_page = dma_direct_unmap_page,
};
EXPORT_SYMBOL(dma_direct_ops);

48
arch/powerpc/kernel/pci-common.c
View File

@@ -56,6 +56,34 @@ resource_size_t isa_mem_base;
/* Default PCI flags is 0 */
unsigned int ppc_pci_flags;
static struct dma_mapping_ops *pci_dma_ops;
void set_pci_dma_ops(struct dma_mapping_ops *dma_ops)
{
pci_dma_ops = dma_ops;
}
struct dma_mapping_ops *get_pci_dma_ops(void)
{
return pci_dma_ops;
}
EXPORT_SYMBOL(get_pci_dma_ops);
int pci_set_dma_mask(struct pci_dev *dev, u64 mask)
{
return dma_set_mask(&dev->dev, mask);
}
int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
{
int rc;
rc = dma_set_mask(&dev->dev, mask);
dev->dev.coherent_dma_mask = dev->dma_mask;
return rc;
}
struct pci_controller *pcibios_alloc_controller(struct device_node *dev)
{
struct pci_controller *phb;
@@ -180,6 +208,26 @@ char __devinit *pcibios_setup(char *str)
return str;
}
void __devinit pcibios_setup_new_device(struct pci_dev *dev)
{
struct dev_archdata *sd = &dev->dev.archdata;
sd->of_node = pci_device_to_OF_node(dev);
DBG("PCI: device %s OF node: %s\n", pci_name(dev),
sd->of_node ? sd->of_node->full_name : "<none>");
sd->dma_ops = pci_dma_ops;
#ifdef CONFIG_PPC32
sd->dma_data = (void *)PCI_DRAM_OFFSET;
#endif
set_dev_node(&dev->dev, pcibus_to_node(dev->bus));
if (ppc_md.pci_dma_dev_setup)
ppc_md.pci_dma_dev_setup(dev);
}
EXPORT_SYMBOL(pcibios_setup_new_device);
/*
* Reads the interrupt pin to determine if interrupt is use by card.
* If the interrupt is used, then gets the interrupt line from the

7
arch/powerpc/kernel/pci_32.c
View File

@@ -424,6 +424,7 @@ void __devinit pcibios_do_bus_setup(struct pci_bus *bus)
unsigned long io_offset;
struct resource *res;
int i;
struct pci_dev *dev;
/* Hookup PHB resources */
io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
@@ -457,6 +458,12 @@ void __devinit pcibios_do_bus_setup(struct pci_bus *bus)
bus->resource[i+1] = res;
}
}
if (ppc_md.pci_dma_bus_setup)
ppc_md.pci_dma_bus_setup(bus);
list_for_each_entry(dev, &bus->devices, bus_list)
pcibios_setup_new_device(dev);
}
/* the next one is stolen from the alpha port... */

46
arch/powerpc/kernel/pci_64.c
View File

@@ -52,35 +52,6 @@ EXPORT_SYMBOL(pci_io_base);
LIST_HEAD(hose_list);
static struct dma_mapping_ops *pci_dma_ops;
void set_pci_dma_ops(struct dma_mapping_ops *dma_ops)
{
pci_dma_ops = dma_ops;
}
struct dma_mapping_ops *get_pci_dma_ops(void)
{
return pci_dma_ops;
}
EXPORT_SYMBOL(get_pci_dma_ops);
int pci_set_dma_mask(struct pci_dev *dev, u64 mask)
{
return dma_set_mask(&dev->dev, mask);
}
int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
{
int rc;
rc = dma_set_mask(&dev->dev, mask);
dev->dev.coherent_dma_mask = dev->dma_mask;
return rc;
}
static void fixup_broken_pcnet32(struct pci_dev* dev)
{
if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
@@ -548,23 +519,6 @@ int __devinit pcibios_map_io_space(struct pci_bus *bus)
}
EXPORT_SYMBOL_GPL(pcibios_map_io_space);
void __devinit pcibios_setup_new_device(struct pci_dev *dev)
{
struct dev_archdata *sd = &dev->dev.archdata;
sd->of_node = pci_device_to_OF_node(dev);
DBG("PCI: device %s OF node: %s\n", pci_name(dev),
sd->of_node ? sd->of_node->full_name : "<none>");
sd->dma_ops = pci_dma_ops;
set_dev_node(&dev->dev, pcibus_to_node(dev->bus));
if (ppc_md.pci_dma_dev_setup)
ppc_md.pci_dma_dev_setup(dev);
}
EXPORT_SYMBOL(pcibios_setup_new_device);
void __devinit pcibios_do_bus_setup(struct pci_bus *bus)
{
struct pci_dev *dev;