| /* |
| * Contains routines needed to support swiotlb for ppc. |
| * |
| * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. |
| * Author: Becky Bruce |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| * |
| */ |
| |
| #include <linux/dma-mapping.h> |
| #include <linux/pfn.h> |
| #include <linux/of_platform.h> |
| #include <linux/platform_device.h> |
| #include <linux/pci.h> |
| |
| #include <asm/machdep.h> |
| #include <asm/swiotlb.h> |
| #include <asm/dma.h> |
| #include <asm/abs_addr.h> |
| |
| unsigned int ppc_swiotlb_enable; |
| |
| /* |
| * At the moment, all platforms that use this code only require |
| * swiotlb to be used if we're operating on HIGHMEM. Since |
| * we don't ever call anything other than map_sg, unmap_sg, |
| * map_page, and unmap_page on highmem, use normal dma_ops |
| * for everything else. |
| */ |
| struct dma_map_ops swiotlb_dma_ops = { |
| .alloc_coherent = dma_direct_alloc_coherent, |
| .free_coherent = dma_direct_free_coherent, |
| .map_sg = swiotlb_map_sg_attrs, |
| .unmap_sg = swiotlb_unmap_sg_attrs, |
| .dma_supported = swiotlb_dma_supported, |
| .map_page = swiotlb_map_page, |
| .unmap_page = swiotlb_unmap_page, |
| .sync_single_for_cpu = swiotlb_sync_single_for_cpu, |
| .sync_single_for_device = swiotlb_sync_single_for_device, |
| .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, |
| .sync_sg_for_device = swiotlb_sync_sg_for_device, |
| .mapping_error = swiotlb_dma_mapping_error, |
| }; |
| |
| void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev) |
| { |
| struct pci_controller *hose; |
| struct dev_archdata *sd; |
| |
| hose = pci_bus_to_host(pdev->bus); |
| sd = &pdev->dev.archdata; |
| sd->max_direct_dma_addr = |
| hose->dma_window_base_cur + hose->dma_window_size; |
| } |
| |
| static int ppc_swiotlb_bus_notify(struct notifier_block *nb, |
| unsigned long action, void *data) |
| { |
| struct device *dev = data; |
| struct dev_archdata *sd; |
| |
| /* We are only intereted in device addition */ |
| if (action != BUS_NOTIFY_ADD_DEVICE) |
| return 0; |
| |
| sd = &dev->archdata; |
| sd->max_direct_dma_addr = 0; |
| |
| /* May need to bounce if the device can't address all of DRAM */ |
| if ((dma_get_mask(dev) + 1) < memblock_end_of_DRAM()) |
| set_dma_ops(dev, &swiotlb_dma_ops); |
| |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block ppc_swiotlb_plat_bus_notifier = { |
| .notifier_call = ppc_swiotlb_bus_notify, |
| .priority = 0, |
| }; |
| |
| int __init swiotlb_setup_bus_notifier(void) |
| { |
| bus_register_notifier(&platform_bus_type, |
| &ppc_swiotlb_plat_bus_notifier); |
| return 0; |
| } |