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