[POWERPC] Refactor 64 bits DMA operations

This patch completely refactors DMA operations for 64 bits powerpc. 32 bits
is untouched for now.

We use the new dev_archdata structure to add the dma operations pointer
and associated data to struct device. While at it, we also add the OF node
pointer and numa node. In the future, we might want to look into merging
that with pci_dn as well.

The old vio, pci-iommu and pci-direct DMA ops are gone. They are now replaced
by a set of generic iommu and direct DMA ops (non PCI specific) that can be
used by bus types. The toplevel implementation is now inline.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

9 files changed, 180 insertions, 59 deletions

diff --git a/include/asm-powerpc/device.h b/include/asm-powerpc/device.h
index d8f9872..228ab2a 100644
--- a/include/asm-powerpc/device.h
+++ b/include/asm-powerpc/device.h
@@ -3,5 +3,22 @@
  *
  * This file is released under the GPLv2
  */
-#include <asm-generic/device.h>
+#ifndef _ASM_POWERPC_DEVICE_H
+#define _ASM_POWERPC_DEVICE_H
 
+struct dma_mapping_ops;
+struct device_node;
+
+struct dev_archdata {
+	/* Optional pointer to an OF device node */
+	struct device_node	*of_node;
+
+	/* DMA operations on that device */
+	struct dma_mapping_ops	*dma_ops;
+	void			*dma_data;
+
+	/* NUMA node if applicable */
+	int			numa_node;
+};
+
+#endif /* _ASM_POWERPC_DEVICE_H */
diff --git a/include/asm-powerpc/dma-mapping.h b/include/asm-powerpc/dma-mapping.h
index 2ab9baf..8367810 100644
--- a/include/asm-powerpc/dma-mapping.h
+++ b/include/asm-powerpc/dma-mapping.h
@@ -44,26 +44,148 @@ extern void __dma_sync_page(struct page *page, unsigned long offset,
 #endif /* ! CONFIG_NOT_COHERENT_CACHE */
 
 #ifdef CONFIG_PPC64
+/*
+ * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
+ */
+struct dma_mapping_ops {
+	void *		(*alloc_coherent)(struct device *dev, size_t size,
+				dma_addr_t *dma_handle, gfp_t flag);
+	void		(*free_coherent)(struct device *dev, size_t size,
+				void *vaddr, dma_addr_t dma_handle);
+	dma_addr_t	(*map_single)(struct device *dev, void *ptr,
+				size_t size, enum dma_data_direction direction);
+	void		(*unmap_single)(struct device *dev, dma_addr_t dma_addr,
+				size_t size, enum dma_data_direction direction);
+	int		(*map_sg)(struct device *dev, struct scatterlist *sg,
+				int nents, enum dma_data_direction direction);
+	void		(*unmap_sg)(struct device *dev, struct scatterlist *sg,
+				int nents, enum dma_data_direction direction);
+	int		(*dma_supported)(struct device *dev, u64 mask);
+	int		(*dac_dma_supported)(struct device *dev, u64 mask);
+	int		(*set_dma_mask)(struct device *dev, u64 dma_mask);
+};
+
+static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
+{
+	/* We don't handle the NULL dev case for ISA for now. We could
+	 * do it via an out of line call but it is not needed for now. The
+	 * only ISA DMA device we support is the floppy and we have a hack
+	 * in the floppy driver directly to get a device for us.
+	 */
+	if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL))
+		return NULL;
+	return dev->archdata.dma_ops;
+}
+
+static inline int dma_supported(struct device *dev, u64 mask)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (unlikely(dma_ops == NULL))
+		return 0;
+	if (dma_ops->dma_supported == NULL)
+		return 1;
+	return dma_ops->dma_supported(dev, mask);
+}
+
+static inline int dma_set_mask(struct device *dev, u64 dma_mask)
+{
+	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+	if (unlikely(dma_ops == NULL))
+		return -EIO;
+	if (dma_ops->set_dma_mask != NULL)
+		return dma_ops->set_dma_mask(dev, dma_mask);
+	if (!dev->dma_mask || !dma_supported(dev, *dev->dma_mask))
+		return -EIO;
+	*dev->dma_mask = dma_mask;
+	return 0;
+}
+
+static inline 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);
+
+	BUG_ON(!dma_ops);
+	return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
+}
+
+static inline 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);
+
+	BUG_ON(!dma_ops);
+	dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
+}
+
+static inline 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);
+
+	BUG_ON(!dma_ops);
+	return dma_ops->map_single(dev, cpu_addr, size, direction);
+}
+
+static inline 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);
+
+	BUG_ON(!dma_ops);
+	dma_ops->unmap_single(dev, dma_addr, size, direction);
+}
+
+static inline 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);
+
+	BUG_ON(!dma_ops);
+	return dma_ops->map_single(dev, page_address(page) + offset, size,
+			direction);
+}
+
+static inline 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);
+
+	BUG_ON(!dma_ops);
+	dma_ops->unmap_single(dev, dma_address, size, direction);
+}
+
+static inline 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);
+
+	BUG_ON(!dma_ops);
+	return dma_ops->map_sg(dev, sg, nents, direction);
+}
+
+static inline 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);
+
+	BUG_ON(!dma_ops);
+	dma_ops->unmap_sg(dev, sg, nhwentries, direction);
+}
 
-extern int dma_supported(struct device *dev, u64 mask);
-extern int dma_set_mask(struct device *dev, u64 dma_mask);
-extern void *dma_alloc_coherent(struct device *dev, size_t size,
-		dma_addr_t *dma_handle, gfp_t flag);
-extern void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
-		dma_addr_t dma_handle);
-extern dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
-		size_t size, enum dma_data_direction direction);
-extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
-		size_t size, enum dma_data_direction direction);
-extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
-		unsigned long offset, size_t size,
-		enum dma_data_direction direction);
-extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
-		size_t size, enum dma_data_direction direction);
-extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
-		enum dma_data_direction direction);
-extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
-		int nhwentries, enum dma_data_direction direction);
+
+/*
+ * Available generic sets of operations
+ */
+extern struct dma_mapping_ops dma_iommu_ops;
+extern struct dma_mapping_ops dma_direct_ops;
 
 #else /* CONFIG_PPC64 */
 
@@ -261,25 +383,5 @@ static inline void dma_cache_sync(void *vaddr, size_t size,
 	__dma_sync(vaddr, size, (int)direction);
 }
 
-/*
- * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
- */
-struct dma_mapping_ops {
-	void *		(*alloc_coherent)(struct device *dev, size_t size,
-				dma_addr_t *dma_handle, gfp_t flag);
-	void		(*free_coherent)(struct device *dev, size_t size,
-				void *vaddr, dma_addr_t dma_handle);
-	dma_addr_t	(*map_single)(struct device *dev, void *ptr,
-				size_t size, enum dma_data_direction direction);
-	void		(*unmap_single)(struct device *dev, dma_addr_t dma_addr,
-				size_t size, enum dma_data_direction direction);
-	int		(*map_sg)(struct device *dev, struct scatterlist *sg,
-				int nents, enum dma_data_direction direction);
-	void		(*unmap_sg)(struct device *dev, struct scatterlist *sg,
-				int nents, enum dma_data_direction direction);
-	int		(*dma_supported)(struct device *dev, u64 mask);
-	int		(*dac_dma_supported)(struct device *dev, u64 mask);
-};
-
 #endif /* __KERNEL__ */
 #endif	/* _ASM_DMA_MAPPING_H */
diff --git a/include/asm-powerpc/ibmebus.h b/include/asm-powerpc/ibmebus.h
index 3493429b..6611211 100644
--- a/include/asm-powerpc/ibmebus.h
+++ b/include/asm-powerpc/ibmebus.h
@@ -44,7 +44,6 @@
 #include <linux/mod_devicetable.h>
 #include <asm/of_device.h>
 
-extern struct dma_mapping_ops ibmebus_dma_ops;
 extern struct bus_type ibmebus_bus_type;
 
 struct ibmebus_dev {	
diff --git a/include/asm-powerpc/iommu.h b/include/asm-powerpc/iommu.h
index 19e6f7e..1940318 100644
--- a/include/asm-powerpc/iommu.h
+++ b/include/asm-powerpc/iommu.h
@@ -79,22 +79,22 @@ extern void iommu_free_table(struct device_node *dn);
 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
 					    int nid);
 
-extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
-		struct scatterlist *sglist, int nelems, unsigned long mask,
-		enum dma_data_direction direction);
+extern int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
+			int nelems, unsigned long mask,
+			enum dma_data_direction direction);
 extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
-		int nelems, enum dma_data_direction direction);
+			   int nelems, enum dma_data_direction direction);
 
 extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size,
-		dma_addr_t *dma_handle, unsigned long mask,
-		gfp_t flag, int node);
+				  dma_addr_t *dma_handle, unsigned long mask,
+				  gfp_t flag, int node);
 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
-		void *vaddr, dma_addr_t dma_handle);
+				void *vaddr, dma_addr_t dma_handle);
 extern dma_addr_t iommu_map_single(struct iommu_table *tbl, void *vaddr,
-		size_t size, unsigned long mask,
-		enum dma_data_direction direction);
+				   size_t size, unsigned long mask,
+				   enum dma_data_direction direction);
 extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
-		size_t size, enum dma_data_direction direction);
+			       size_t size, enum dma_data_direction direction);
 
 extern void iommu_init_early_pSeries(void);
 extern void iommu_init_early_iSeries(void);
diff --git a/include/asm-powerpc/iseries/iommu.h b/include/asm-powerpc/iseries/iommu.h
index 0edbfe1..6e323a1 100644
--- a/include/asm-powerpc/iseries/iommu.h
+++ b/include/asm-powerpc/iseries/iommu.h
@@ -21,11 +21,13 @@
  * Boston, MA  02111-1307  USA
  */
 
+struct pci_dev;
 struct device_node;
 struct iommu_table;
 
 /* Creates table for an individual device node */
-extern void iommu_devnode_init_iSeries(struct device_node *dn);
+extern void iommu_devnode_init_iSeries(struct pci_dev *pdev,
+				       struct device_node *dn);
 
 /* Get table parameters from HV */
 extern void iommu_table_getparms_iSeries(unsigned long busno,
diff --git a/include/asm-powerpc/machdep.h b/include/asm-powerpc/machdep.h
index 162205f..ccc2974 100644
--- a/include/asm-powerpc/machdep.h
+++ b/include/asm-powerpc/machdep.h
@@ -84,8 +84,8 @@ struct machdep_calls {
 	unsigned long	(*tce_get)(struct iommu_table *tbl,
 				    long index);
 	void		(*tce_flush)(struct iommu_table *tbl);
-	void		(*iommu_dev_setup)(struct pci_dev *dev);
-	void		(*iommu_bus_setup)(struct pci_bus *bus);
+	void		(*pci_dma_dev_setup)(struct pci_dev *dev);
+	void		(*pci_dma_bus_setup)(struct pci_bus *bus);
 #endif /* CONFIG_PPC64 */
 
 	int		(*probe)(void);
diff --git a/include/asm-powerpc/of_device.h b/include/asm-powerpc/of_device.h
index 1ef7e9e..a889b20 100644
--- a/include/asm-powerpc/of_device.h
+++ b/include/asm-powerpc/of_device.h
@@ -14,7 +14,7 @@
  */
 struct of_device
 {
-	struct device_node	*node;		/* OF device node */
+	struct device_node	*node;		/* to be obsoleted */
 	u64			dma_mask;	/* DMA mask */
 	struct device		dev;		/* Generic device interface */
 };
diff --git a/include/asm-powerpc/pci.h b/include/asm-powerpc/pci.h
index c772860..16f1331 100644
--- a/include/asm-powerpc/pci.h
+++ b/include/asm-powerpc/pci.h
@@ -70,15 +70,15 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
  */
 #define PCI_DISABLE_MWI
 
-extern struct dma_mapping_ops pci_dma_ops;
+extern struct dma_mapping_ops *pci_dma_ops;
 
 /* For DAC DMA, we currently don't support it by default, but
  * we let 64-bit platforms override this.
  */
 static inline int pci_dac_dma_supported(struct pci_dev *hwdev,u64 mask)
 {
-	if (pci_dma_ops.dac_dma_supported)
-		return pci_dma_ops.dac_dma_supported(&hwdev->dev, mask);
+	if (pci_dma_ops && pci_dma_ops->dac_dma_supported)
+		return pci_dma_ops->dac_dma_supported(&hwdev->dev, mask);
 	return 0;
 }
 
@@ -210,6 +210,8 @@ extern int remap_bus_range(struct pci_bus *bus);
 extern void pcibios_fixup_device_resources(struct pci_dev *dev,
 			struct pci_bus *bus);
 
+extern void pcibios_setup_new_device(struct pci_dev *dev);
+
 extern void pcibios_claim_one_bus(struct pci_bus *b);
 
 extern struct pci_controller *init_phb_dynamic(struct device_node *dn);
diff --git a/include/asm-powerpc/vio.h b/include/asm-powerpc/vio.h
index 4b51d42..0117b54 100644
--- a/include/asm-powerpc/vio.h
+++ b/include/asm-powerpc/vio.h
@@ -45,7 +45,6 @@ struct iommu_table;
  * The vio_dev structure is used to describe virtual I/O devices.
  */
 struct vio_dev {
-	struct iommu_table *iommu_table;     /* vio_map_* uses this */
 	const char *name;
 	const char *type;
 	uint32_t unit_address;