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
);