2 * Contains routines needed to support swiotlb for ppc.
4 * Copyright (C) 2009 Becky Bruce, Freescale Semiconductor
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
13 #include <linux/dma-mapping.h>
14 #include <linux/pfn.h>
15 #include <linux/of_platform.h>
16 #include <linux/platform_device.h>
17 #include <linux/pci.h>
19 #include <asm/machdep.h>
20 #include <asm/swiotlb.h>
22 #include <asm/abs_addr.h>
24 unsigned int ppc_swiotlb_enable;
27 * At the moment, all platforms that use this code only require
28 * swiotlb to be used if we're operating on HIGHMEM. Since
29 * we don't ever call anything other than map_sg, unmap_sg,
30 * map_page, and unmap_page on highmem, use normal dma_ops
31 * for everything else.
33 struct dma_map_ops swiotlb_dma_ops = {
34 .alloc_coherent = dma_direct_alloc_coherent,
35 .free_coherent = dma_direct_free_coherent,
36 .map_sg = swiotlb_map_sg_attrs,
37 .unmap_sg = swiotlb_unmap_sg_attrs,
38 .dma_supported = swiotlb_dma_supported,
39 .map_page = swiotlb_map_page,
40 .unmap_page = swiotlb_unmap_page,
41 .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
42 .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
43 .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
44 .sync_sg_for_device = swiotlb_sync_sg_for_device,
45 .mapping_error = swiotlb_dma_mapping_error,
48 void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev)
50 struct pci_controller *hose;
51 struct dev_archdata *sd;
53 hose = pci_bus_to_host(pdev->bus);
54 sd = &pdev->dev.archdata;
55 sd->max_direct_dma_addr =
56 hose->dma_window_base_cur + hose->dma_window_size;
59 static int ppc_swiotlb_bus_notify(struct notifier_block *nb,
60 unsigned long action, void *data)
62 struct device *dev = data;
63 struct dev_archdata *sd;
65 /* We are only intereted in device addition */
66 if (action != BUS_NOTIFY_ADD_DEVICE)
70 sd->max_direct_dma_addr = 0;
72 /* May need to bounce if the device can't address all of DRAM */
73 if (dma_get_mask(dev) < lmb_end_of_DRAM())
74 set_dma_ops(dev, &swiotlb_dma_ops);
79 static struct notifier_block ppc_swiotlb_plat_bus_notifier = {
80 .notifier_call = ppc_swiotlb_bus_notify,
84 static struct notifier_block ppc_swiotlb_of_bus_notifier = {
85 .notifier_call = ppc_swiotlb_bus_notify,
89 int __init swiotlb_setup_bus_notifier(void)
91 bus_register_notifier(&platform_bus_type,
92 &ppc_swiotlb_plat_bus_notifier);
93 bus_register_notifier(&of_platform_bus_type,
94 &ppc_swiotlb_of_bus_notifier);