projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| ec3cf2ec BB |
24 | unsigned int ppc_swiotlb_enable; |
| 25 | ||
| ec3cf2ec BB |
26 | /* |
| 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. | |
| 32 | */ | |
| 45223c54 | 33 | struct dma_map_ops swiotlb_dma_ops = { |
| ec3cf2ec BB |
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, | |
| ec3cf2ec BB |
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, | |
| 4a9a6bfe FT |
44 | .sync_sg_for_device = swiotlb_sync_sg_for_device, |
| 45 | .mapping_error = swiotlb_dma_mapping_error, | |
| ec3cf2ec BB |
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 | } |