b8b14c6676
When we compare the devices DMA mask to the amount of memory we need to make sure we treat the DMA mask as an address boundary. For example if the DMA_MASK(32) and we have 4G of memory we'd incorrectly set the dma ops to swiotlb. We need to add one to the dma mask when we convert it. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/*
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* Contains routines needed to support swiotlb for ppc.
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*
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* Copyright (C) 2009-2010 Freescale Semiconductor, Inc.
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* Author: Becky Bruce
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/dma-mapping.h>
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#include <linux/pfn.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/pci.h>
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#include <asm/machdep.h>
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#include <asm/swiotlb.h>
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#include <asm/dma.h>
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#include <asm/abs_addr.h>
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unsigned int ppc_swiotlb_enable;
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/*
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* At the moment, all platforms that use this code only require
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* swiotlb to be used if we're operating on HIGHMEM. Since
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* we don't ever call anything other than map_sg, unmap_sg,
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* map_page, and unmap_page on highmem, use normal dma_ops
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* for everything else.
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*/
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struct dma_map_ops swiotlb_dma_ops = {
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.alloc_coherent = dma_direct_alloc_coherent,
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.free_coherent = dma_direct_free_coherent,
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.map_sg = swiotlb_map_sg_attrs,
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.unmap_sg = swiotlb_unmap_sg_attrs,
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.dma_supported = swiotlb_dma_supported,
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.map_page = swiotlb_map_page,
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.unmap_page = swiotlb_unmap_page,
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.sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
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.sync_single_range_for_device = swiotlb_sync_single_range_for_device,
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.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
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.sync_sg_for_device = swiotlb_sync_sg_for_device,
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.mapping_error = swiotlb_dma_mapping_error,
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};
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void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev)
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{
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struct pci_controller *hose;
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struct dev_archdata *sd;
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hose = pci_bus_to_host(pdev->bus);
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sd = &pdev->dev.archdata;
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sd->max_direct_dma_addr =
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hose->dma_window_base_cur + hose->dma_window_size;
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}
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static int ppc_swiotlb_bus_notify(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct device *dev = data;
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struct dev_archdata *sd;
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/* We are only intereted in device addition */
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if (action != BUS_NOTIFY_ADD_DEVICE)
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return 0;
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sd = &dev->archdata;
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sd->max_direct_dma_addr = 0;
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/* May need to bounce if the device can't address all of DRAM */
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if ((dma_get_mask(dev) + 1) < lmb_end_of_DRAM())
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set_dma_ops(dev, &swiotlb_dma_ops);
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return NOTIFY_DONE;
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}
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static struct notifier_block ppc_swiotlb_plat_bus_notifier = {
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.notifier_call = ppc_swiotlb_bus_notify,
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.priority = 0,
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};
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static struct notifier_block ppc_swiotlb_of_bus_notifier = {
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.notifier_call = ppc_swiotlb_bus_notify,
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.priority = 0,
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};
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int __init swiotlb_setup_bus_notifier(void)
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{
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bus_register_notifier(&platform_bus_type,
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&ppc_swiotlb_plat_bus_notifier);
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bus_register_notifier(&of_platform_bus_type,
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&ppc_swiotlb_of_bus_notifier);
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return 0;
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}
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