31f940afda
The generic code allows a few nice things such as node local allocations and dipping into the CMA area. The lookup of the right zone for a given dma mask works a little different, but the results should be the same. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
93 lines
2.4 KiB
C
93 lines
2.4 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-direct.h>
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#include <linux/memblock.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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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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const struct dma_map_ops powerpc_swiotlb_dma_ops = {
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.alloc = dma_direct_alloc,
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.free = dma_direct_free,
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.map_sg = dma_direct_map_sg,
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.unmap_sg = dma_direct_unmap_sg,
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.dma_supported = dma_direct_supported,
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.map_page = dma_direct_map_page,
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.unmap_page = dma_direct_unmap_page,
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.sync_single_for_cpu = dma_direct_sync_single_for_cpu,
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.sync_single_for_device = dma_direct_sync_single_for_device,
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.sync_sg_for_cpu = dma_direct_sync_sg_for_cpu,
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.sync_sg_for_device = dma_direct_sync_sg_for_device,
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.get_required_mask = dma_direct_get_required_mask,
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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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/* 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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/* May need to bounce if the device can't address all of DRAM */
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if ((dma_get_mask(dev) + 1) < memblock_end_of_DRAM())
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set_dma_ops(dev, &powerpc_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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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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return 0;
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}
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void __init swiotlb_detect_4g(void)
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{
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if ((memblock_end_of_DRAM() - 1) > 0xffffffff)
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ppc_swiotlb_enable = 1;
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}
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static int __init check_swiotlb_enabled(void)
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{
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if (ppc_swiotlb_enable)
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swiotlb_print_info();
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else
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swiotlb_exit();
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return 0;
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}
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subsys_initcall(check_swiotlb_enabled);
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