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ec3cf2ec BB |
1 | /* |
2 | * Contains routines needed to support swiotlb for ppc. | |
3 | * | |
4 | * Copyright (C) 2009 Becky Bruce, Freescale Semiconductor | |
5 | * | |
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. | |
10 | * | |
11 | */ | |
12 | ||
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> | |
18 | ||
19 | #include <asm/machdep.h> | |
20 | #include <asm/swiotlb.h> | |
21 | #include <asm/dma.h> | |
22 | #include <asm/abs_addr.h> | |
23 | ||
24 | int swiotlb __read_mostly; | |
25 | unsigned int ppc_swiotlb_enable; | |
26 | ||
ec3cf2ec BB |
27 | /* |
28 | * At the moment, all platforms that use this code only require | |
29 | * swiotlb to be used if we're operating on HIGHMEM. Since | |
30 | * we don't ever call anything other than map_sg, unmap_sg, | |
31 | * map_page, and unmap_page on highmem, use normal dma_ops | |
32 | * for everything else. | |
33 | */ | |
45223c54 | 34 | struct dma_map_ops swiotlb_dma_ops = { |
ec3cf2ec BB |
35 | .alloc_coherent = dma_direct_alloc_coherent, |
36 | .free_coherent = dma_direct_free_coherent, | |
37 | .map_sg = swiotlb_map_sg_attrs, | |
38 | .unmap_sg = swiotlb_unmap_sg_attrs, | |
39 | .dma_supported = swiotlb_dma_supported, | |
40 | .map_page = swiotlb_map_page, | |
41 | .unmap_page = swiotlb_unmap_page, | |
ec3cf2ec BB |
42 | .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu, |
43 | .sync_single_range_for_device = swiotlb_sync_single_range_for_device, | |
44 | .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, | |
45 | .sync_sg_for_device = swiotlb_sync_sg_for_device | |
46 | }; | |
47 | ||
762afb73 FT |
48 | void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev) |
49 | { | |
50 | struct pci_controller *hose; | |
51 | struct dev_archdata *sd; | |
52 | ||
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; | |
57 | } | |
58 | ||
ec3cf2ec BB |
59 | static int ppc_swiotlb_bus_notify(struct notifier_block *nb, |
60 | unsigned long action, void *data) | |
61 | { | |
62 | struct device *dev = data; | |
762afb73 | 63 | struct dev_archdata *sd; |
ec3cf2ec BB |
64 | |
65 | /* We are only intereted in device addition */ | |
66 | if (action != BUS_NOTIFY_ADD_DEVICE) | |
67 | return 0; | |
68 | ||
762afb73 FT |
69 | sd = &dev->archdata; |
70 | sd->max_direct_dma_addr = 0; | |
71 | ||
ec3cf2ec BB |
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); | |
75 | ||
76 | return NOTIFY_DONE; | |
77 | } | |
78 | ||
79 | static struct notifier_block ppc_swiotlb_plat_bus_notifier = { | |
80 | .notifier_call = ppc_swiotlb_bus_notify, | |
81 | .priority = 0, | |
82 | }; | |
83 | ||
84 | static struct notifier_block ppc_swiotlb_of_bus_notifier = { | |
85 | .notifier_call = ppc_swiotlb_bus_notify, | |
86 | .priority = 0, | |
87 | }; | |
88 | ||
89 | int __init swiotlb_setup_bus_notifier(void) | |
90 | { | |
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); | |
95 | ||
96 | return 0; | |
97 | } |