[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>

1 files changed, 0 insertions, 164 deletions

diff --git a/arch/powerpc/kernel/pci_iommu.c b/arch/powerpc/kernel/pci_iommu.c
deleted file mode 100644
index 0688b2534acb..000000000000
--- a/arch/powerpc/kernel/pci_iommu.c
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
- *
- * Rewrite, cleanup, new allocation schemes:
- * Copyright (C) 2004 Olof Johansson, IBM Corporation
- *
- * Dynamic DMA mapping support, platform-independent parts.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
- */
-
-
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
-#include <linux/spinlock.h>
-#include <linux/string.h>
-#include <linux/pci.h>
-#include <linux/dma-mapping.h>
-#include <asm/io.h>
-#include <asm/prom.h>
-#include <asm/iommu.h>
-#include <asm/pci-bridge.h>
-#include <asm/machdep.h>
-#include <asm/ppc-pci.h>
-
-/*
- * We can use ->sysdata directly and avoid the extra work in
- * pci_device_to_OF_node since ->sysdata will have been initialised
- * in the iommu init code for all devices.
- */
-#define PCI_GET_DN(dev) ((struct device_node *)((dev)->sysdata))
-
-static inline struct iommu_table *device_to_table(struct device *hwdev)
-{
-        struct pci_dev *pdev;
-
-        if (!hwdev) {
-                pdev = ppc64_isabridge_dev;
-                if (!pdev)
-                        return NULL;
-        } else
-                pdev = to_pci_dev(hwdev);
-
-        return PCI_DN(PCI_GET_DN(pdev))->iommu_table;
-}
-
-
-static inline unsigned long device_to_mask(struct device *hwdev)
-{
-        struct pci_dev *pdev;
-
-        if (!hwdev) {
-                pdev = ppc64_isabridge_dev;
-                if (!pdev) /* This is the best guess we can do */
-                        return 0xfffffffful;
-        } else
-                pdev = to_pci_dev(hwdev);
-
-        if (pdev->dma_mask)
-                return pdev->dma_mask;
-
-        /* Assume devices without mask can take 32 bit addresses */
-        return 0xfffffffful;
-}
-
-
-/* Allocates a contiguous real buffer and creates mappings over it.
- * Returns the virtual address of the buffer and sets dma_handle
- * to the dma address (mapping) of the first page.
- */
-static void *pci_iommu_alloc_coherent(struct device *hwdev, size_t size,
-                           dma_addr_t *dma_handle, gfp_t flag)
-{
-        return iommu_alloc_coherent(device_to_table(hwdev), size, dma_handle,
-                        device_to_mask(hwdev), flag,
-                        pcibus_to_node(to_pci_dev(hwdev)->bus));
-}
-
-static void pci_iommu_free_coherent(struct device *hwdev, size_t size,
-                         void *vaddr, dma_addr_t dma_handle)
-{
-        iommu_free_coherent(device_to_table(hwdev), size, vaddr, dma_handle);
-}
-
-/* Creates TCEs for a user provided buffer.  The user buffer must be 
- * contiguous real kernel storage (not vmalloc).  The address of the buffer
- * passed here is the kernel (virtual) address of the buffer.  The buffer
- * need not be page aligned, the dma_addr_t returned will point to the same
- * byte within the page as vaddr.
- */
-static dma_addr_t pci_iommu_map_single(struct device *hwdev, void *vaddr,
-                size_t size, enum dma_data_direction direction)
-{
-        return iommu_map_single(device_to_table(hwdev), vaddr, size,
-                                device_to_mask(hwdev), direction);
-}
-
-
-static void pci_iommu_unmap_single(struct device *hwdev, dma_addr_t dma_handle,
-                size_t size, enum dma_data_direction direction)
-{
-        iommu_unmap_single(device_to_table(hwdev), dma_handle, size, direction);
-}
-
-
-static int pci_iommu_map_sg(struct device *pdev, struct scatterlist *sglist,
-                int nelems, enum dma_data_direction direction)
-{
-        return iommu_map_sg(pdev, device_to_table(pdev), sglist,
-                        nelems, device_to_mask(pdev), direction);
-}
-
-static void pci_iommu_unmap_sg(struct device *pdev, struct scatterlist *sglist,
-                int nelems, enum dma_data_direction direction)
-{
-        iommu_unmap_sg(device_to_table(pdev), sglist, nelems, direction);
-}
-
-/* We support DMA to/from any memory page via the iommu */
-static int pci_iommu_dma_supported(struct device *dev, u64 mask)
-{
-        struct iommu_table *tbl = device_to_table(dev);
-
-        if (!tbl || tbl->it_offset > mask) {
-                printk(KERN_INFO "Warning: IOMMU table offset too big for device mask\n");
-                if (tbl)
-                        printk(KERN_INFO "mask: 0x%08lx, table offset: 0x%08lx\n",
-                                mask, tbl->it_offset);
-                else
-                        printk(KERN_INFO "mask: 0x%08lx, table unavailable\n",
-                                mask);
-                return 0;
-        } else
-                return 1;
-}
-
-struct dma_mapping_ops pci_iommu_ops = {
-        .alloc_coherent = pci_iommu_alloc_coherent,
-        .free_coherent = pci_iommu_free_coherent,
-        .map_single = pci_iommu_map_single,
-        .unmap_single = pci_iommu_unmap_single,
-        .map_sg = pci_iommu_map_sg,
-        .unmap_sg = pci_iommu_unmap_sg,
-        .dma_supported = pci_iommu_dma_supported,
-};
-
-void pci_iommu_init(void)
-{
-        pci_dma_ops = pci_iommu_ops;
-}