Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Contains routines needed to support swiotlb for ppc. |
| 3 | * |
Kumar Gala | b8b14c6 | 2010-05-03 07:36:22 -0500 | [diff] [blame] | 4 | * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. |
| 5 | * Author: Becky Bruce |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the |
| 9 | * Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #include <linux/dma-mapping.h> |
| 15 | #include <linux/pfn.h> |
| 16 | #include <linux/of_platform.h> |
| 17 | #include <linux/platform_device.h> |
| 18 | #include <linux/pci.h> |
| 19 | |
| 20 | #include <asm/machdep.h> |
| 21 | #include <asm/swiotlb.h> |
| 22 | #include <asm/dma.h> |
| 23 | #include <asm/abs_addr.h> |
| 24 | |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 25 | unsigned int ppc_swiotlb_enable; |
| 26 | |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 27 | /* |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 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 | */ |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 34 | struct dma_map_ops swiotlb_dma_ops = { |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 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, |
FUJITA Tomonori | 712d3e2 | 2010-05-26 14:44:17 -0700 | [diff] [blame] | 42 | .sync_single_for_cpu = swiotlb_sync_single_for_cpu, |
| 43 | .sync_single_for_device = swiotlb_sync_single_for_device, |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 44 | .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, |
FUJITA Tomonori | 4a9a6bf | 2009-08-04 19:08:27 +0000 | [diff] [blame] | 45 | .sync_sg_for_device = swiotlb_sync_sg_for_device, |
| 46 | .mapping_error = swiotlb_dma_mapping_error, |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 47 | }; |
| 48 | |
FUJITA Tomonori | 762afb7 | 2009-08-04 19:08:22 +0000 | [diff] [blame] | 49 | void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev) |
| 50 | { |
| 51 | struct pci_controller *hose; |
| 52 | struct dev_archdata *sd; |
| 53 | |
| 54 | hose = pci_bus_to_host(pdev->bus); |
| 55 | sd = &pdev->dev.archdata; |
| 56 | sd->max_direct_dma_addr = |
| 57 | hose->dma_window_base_cur + hose->dma_window_size; |
| 58 | } |
| 59 | |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 60 | static int ppc_swiotlb_bus_notify(struct notifier_block *nb, |
| 61 | unsigned long action, void *data) |
| 62 | { |
| 63 | struct device *dev = data; |
FUJITA Tomonori | 762afb7 | 2009-08-04 19:08:22 +0000 | [diff] [blame] | 64 | struct dev_archdata *sd; |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 65 | |
| 66 | /* We are only intereted in device addition */ |
| 67 | if (action != BUS_NOTIFY_ADD_DEVICE) |
| 68 | return 0; |
| 69 | |
FUJITA Tomonori | 762afb7 | 2009-08-04 19:08:22 +0000 | [diff] [blame] | 70 | sd = &dev->archdata; |
| 71 | sd->max_direct_dma_addr = 0; |
| 72 | |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 73 | /* May need to bounce if the device can't address all of DRAM */ |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 74 | if ((dma_get_mask(dev) + 1) < memblock_end_of_DRAM()) |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 75 | set_dma_ops(dev, &swiotlb_dma_ops); |
| 76 | |
| 77 | return NOTIFY_DONE; |
| 78 | } |
| 79 | |
| 80 | static struct notifier_block ppc_swiotlb_plat_bus_notifier = { |
| 81 | .notifier_call = ppc_swiotlb_bus_notify, |
| 82 | .priority = 0, |
| 83 | }; |
| 84 | |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 85 | int __init swiotlb_setup_bus_notifier(void) |
| 86 | { |
| 87 | bus_register_notifier(&platform_bus_type, |
| 88 | &ppc_swiotlb_plat_bus_notifier); |
Becky Bruce | ec3cf2e | 2009-05-14 12:42:28 +0000 | [diff] [blame] | 89 | return 0; |
| 90 | } |