1 /* 2 * Contains routines needed to support swiotlb for ppc. 3 * 4 * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. 5 * Author: Becky Bruce 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 25 unsigned int ppc_swiotlb_enable; 26 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 */ 34 struct dma_map_ops swiotlb_dma_ops = { 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, 42 .sync_single_for_cpu = swiotlb_sync_single_for_cpu, 43 .sync_single_for_device = swiotlb_sync_single_for_device, 44 .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, 45 .sync_sg_for_device = swiotlb_sync_sg_for_device, 46 .mapping_error = swiotlb_dma_mapping_error, 47 }; 48 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 60 static int ppc_swiotlb_bus_notify(struct notifier_block *nb, 61 unsigned long action, void *data) 62 { 63 struct device *dev = data; 64 struct dev_archdata *sd; 65 66 /* We are only intereted in device addition */ 67 if (action != BUS_NOTIFY_ADD_DEVICE) 68 return 0; 69 70 sd = &dev->archdata; 71 sd->max_direct_dma_addr = 0; 72 73 /* May need to bounce if the device can't address all of DRAM */ 74 if ((dma_get_mask(dev) + 1) < lmb_end_of_DRAM()) 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 85 static struct notifier_block ppc_swiotlb_of_bus_notifier = { 86 .notifier_call = ppc_swiotlb_bus_notify, 87 .priority = 0, 88 }; 89 90 int __init swiotlb_setup_bus_notifier(void) 91 { 92 bus_register_notifier(&platform_bus_type, 93 &ppc_swiotlb_plat_bus_notifier); 94 bus_register_notifier(&of_platform_bus_type, 95 &ppc_swiotlb_of_bus_notifier); 96 97 return 0; 98 } 99