diff options
Diffstat (limited to 'arch/powerpc/kernel/pci_iommu.c')
| -rw-r--r-- | arch/powerpc/kernel/pci_iommu.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/pci_iommu.c b/arch/powerpc/kernel/pci_iommu.c new file mode 100644 index 00000000000..bdf15dbbf4f --- /dev/null +++ b/arch/powerpc/kernel/pci_iommu.c @@ -0,0 +1,128 @@ +/* + * arch/ppc64/kernel/pci_iommu.c + * 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 *devnode_table(struct device *dev) +{ + struct pci_dev *pdev; + + if (!dev) { + pdev = ppc64_isabridge_dev; + if (!pdev) + return NULL; + } else + pdev = to_pci_dev(dev); + + return PCI_DN(PCI_GET_DN(pdev))->iommu_table; +} + + +/* 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(devnode_table(hwdev), size, dma_handle, + flag); +} + +static void pci_iommu_free_coherent(struct device *hwdev, size_t size, + void *vaddr, dma_addr_t dma_handle) +{ + iommu_free_coherent(devnode_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(devnode_table(hwdev), vaddr, size, 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(devnode_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, devnode_table(pdev), sglist, + nelems, direction); +} + +static void pci_iommu_unmap_sg(struct device *pdev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction) +{ + iommu_unmap_sg(devnode_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) +{ + return 1; +} + +void pci_iommu_init(void) +{ + pci_dma_ops.alloc_coherent = pci_iommu_alloc_coherent; + pci_dma_ops.free_coherent = pci_iommu_free_coherent; + pci_dma_ops.map_single = pci_iommu_map_single; + pci_dma_ops.unmap_single = pci_iommu_unmap_single; + pci_dma_ops.map_sg = pci_iommu_map_sg; + pci_dma_ops.unmap_sg = pci_iommu_unmap_sg; + pci_dma_ops.dma_supported = pci_iommu_dma_supported; +} |