1ec3cf2ecSBecky Bruce /* 2ec3cf2ecSBecky Bruce * Contains routines needed to support swiotlb for ppc. 3ec3cf2ecSBecky Bruce * 4b8b14c66SKumar Gala * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. 5b8b14c66SKumar Gala * Author: Becky Bruce 6ec3cf2ecSBecky Bruce * 7ec3cf2ecSBecky Bruce * This program is free software; you can redistribute it and/or modify it 8ec3cf2ecSBecky Bruce * under the terms of the GNU General Public License as published by the 9ec3cf2ecSBecky Bruce * Free Software Foundation; either version 2 of the License, or (at your 10ec3cf2ecSBecky Bruce * option) any later version. 11ec3cf2ecSBecky Bruce * 12ec3cf2ecSBecky Bruce */ 13ec3cf2ecSBecky Bruce 14ec3cf2ecSBecky Bruce #include <linux/dma-mapping.h> 15ec3cf2ecSBecky Bruce #include <linux/pfn.h> 16ec3cf2ecSBecky Bruce #include <linux/of_platform.h> 17ec3cf2ecSBecky Bruce #include <linux/platform_device.h> 18ec3cf2ecSBecky Bruce #include <linux/pci.h> 19ec3cf2ecSBecky Bruce 20ec3cf2ecSBecky Bruce #include <asm/machdep.h> 21ec3cf2ecSBecky Bruce #include <asm/swiotlb.h> 22ec3cf2ecSBecky Bruce #include <asm/dma.h> 23ec3cf2ecSBecky Bruce #include <asm/abs_addr.h> 24ec3cf2ecSBecky Bruce 25ec3cf2ecSBecky Bruce unsigned int ppc_swiotlb_enable; 26ec3cf2ecSBecky Bruce 27ec3cf2ecSBecky Bruce /* 28ec3cf2ecSBecky Bruce * At the moment, all platforms that use this code only require 29ec3cf2ecSBecky Bruce * swiotlb to be used if we're operating on HIGHMEM. Since 30ec3cf2ecSBecky Bruce * we don't ever call anything other than map_sg, unmap_sg, 31ec3cf2ecSBecky Bruce * map_page, and unmap_page on highmem, use normal dma_ops 32ec3cf2ecSBecky Bruce * for everything else. 33ec3cf2ecSBecky Bruce */ 3445223c54SFUJITA Tomonori struct dma_map_ops swiotlb_dma_ops = { 35ec3cf2ecSBecky Bruce .alloc_coherent = dma_direct_alloc_coherent, 36ec3cf2ecSBecky Bruce .free_coherent = dma_direct_free_coherent, 37ec3cf2ecSBecky Bruce .map_sg = swiotlb_map_sg_attrs, 38ec3cf2ecSBecky Bruce .unmap_sg = swiotlb_unmap_sg_attrs, 39ec3cf2ecSBecky Bruce .dma_supported = swiotlb_dma_supported, 40ec3cf2ecSBecky Bruce .map_page = swiotlb_map_page, 41ec3cf2ecSBecky Bruce .unmap_page = swiotlb_unmap_page, 42ec3cf2ecSBecky Bruce .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu, 43ec3cf2ecSBecky Bruce .sync_single_range_for_device = swiotlb_sync_single_range_for_device, 44ec3cf2ecSBecky Bruce .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, 454a9a6bfeSFUJITA Tomonori .sync_sg_for_device = swiotlb_sync_sg_for_device, 464a9a6bfeSFUJITA Tomonori .mapping_error = swiotlb_dma_mapping_error, 47ec3cf2ecSBecky Bruce }; 48ec3cf2ecSBecky Bruce 49762afb73SFUJITA Tomonori void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev) 50762afb73SFUJITA Tomonori { 51762afb73SFUJITA Tomonori struct pci_controller *hose; 52762afb73SFUJITA Tomonori struct dev_archdata *sd; 53762afb73SFUJITA Tomonori 54762afb73SFUJITA Tomonori hose = pci_bus_to_host(pdev->bus); 55762afb73SFUJITA Tomonori sd = &pdev->dev.archdata; 56762afb73SFUJITA Tomonori sd->max_direct_dma_addr = 57762afb73SFUJITA Tomonori hose->dma_window_base_cur + hose->dma_window_size; 58762afb73SFUJITA Tomonori } 59762afb73SFUJITA Tomonori 60ec3cf2ecSBecky Bruce static int ppc_swiotlb_bus_notify(struct notifier_block *nb, 61ec3cf2ecSBecky Bruce unsigned long action, void *data) 62ec3cf2ecSBecky Bruce { 63ec3cf2ecSBecky Bruce struct device *dev = data; 64762afb73SFUJITA Tomonori struct dev_archdata *sd; 65ec3cf2ecSBecky Bruce 66ec3cf2ecSBecky Bruce /* We are only intereted in device addition */ 67ec3cf2ecSBecky Bruce if (action != BUS_NOTIFY_ADD_DEVICE) 68ec3cf2ecSBecky Bruce return 0; 69ec3cf2ecSBecky Bruce 70762afb73SFUJITA Tomonori sd = &dev->archdata; 71762afb73SFUJITA Tomonori sd->max_direct_dma_addr = 0; 72762afb73SFUJITA Tomonori 73ec3cf2ecSBecky Bruce /* May need to bounce if the device can't address all of DRAM */ 74b8b14c66SKumar Gala if ((dma_get_mask(dev) + 1) < lmb_end_of_DRAM()) 75ec3cf2ecSBecky Bruce set_dma_ops(dev, &swiotlb_dma_ops); 76ec3cf2ecSBecky Bruce 77ec3cf2ecSBecky Bruce return NOTIFY_DONE; 78ec3cf2ecSBecky Bruce } 79ec3cf2ecSBecky Bruce 80ec3cf2ecSBecky Bruce static struct notifier_block ppc_swiotlb_plat_bus_notifier = { 81ec3cf2ecSBecky Bruce .notifier_call = ppc_swiotlb_bus_notify, 82ec3cf2ecSBecky Bruce .priority = 0, 83ec3cf2ecSBecky Bruce }; 84ec3cf2ecSBecky Bruce 85ec3cf2ecSBecky Bruce static struct notifier_block ppc_swiotlb_of_bus_notifier = { 86ec3cf2ecSBecky Bruce .notifier_call = ppc_swiotlb_bus_notify, 87ec3cf2ecSBecky Bruce .priority = 0, 88ec3cf2ecSBecky Bruce }; 89ec3cf2ecSBecky Bruce 90ec3cf2ecSBecky Bruce int __init swiotlb_setup_bus_notifier(void) 91ec3cf2ecSBecky Bruce { 92ec3cf2ecSBecky Bruce bus_register_notifier(&platform_bus_type, 93ec3cf2ecSBecky Bruce &ppc_swiotlb_plat_bus_notifier); 94ec3cf2ecSBecky Bruce bus_register_notifier(&of_platform_bus_type, 95ec3cf2ecSBecky Bruce &ppc_swiotlb_of_bus_notifier); 96ec3cf2ecSBecky Bruce 97ec3cf2ecSBecky Bruce return 0; 98ec3cf2ecSBecky Bruce } 99