1ec3cf2ecSBecky Bruce /* 2ec3cf2ecSBecky Bruce * Contains routines needed to support swiotlb for ppc. 3ec3cf2ecSBecky Bruce * 4ec3cf2ecSBecky Bruce * Copyright (C) 2009 Becky Bruce, Freescale Semiconductor 5ec3cf2ecSBecky Bruce * 6ec3cf2ecSBecky Bruce * This program is free software; you can redistribute it and/or modify it 7ec3cf2ecSBecky Bruce * under the terms of the GNU General Public License as published by the 8ec3cf2ecSBecky Bruce * Free Software Foundation; either version 2 of the License, or (at your 9ec3cf2ecSBecky Bruce * option) any later version. 10ec3cf2ecSBecky Bruce * 11ec3cf2ecSBecky Bruce */ 12ec3cf2ecSBecky Bruce 13ec3cf2ecSBecky Bruce #include <linux/dma-mapping.h> 14ec3cf2ecSBecky Bruce #include <linux/pfn.h> 15ec3cf2ecSBecky Bruce #include <linux/of_platform.h> 16ec3cf2ecSBecky Bruce #include <linux/platform_device.h> 17ec3cf2ecSBecky Bruce #include <linux/pci.h> 18ec3cf2ecSBecky Bruce 19ec3cf2ecSBecky Bruce #include <asm/machdep.h> 20ec3cf2ecSBecky Bruce #include <asm/swiotlb.h> 21ec3cf2ecSBecky Bruce #include <asm/dma.h> 22ec3cf2ecSBecky Bruce #include <asm/abs_addr.h> 23ec3cf2ecSBecky Bruce 24ec3cf2ecSBecky Bruce int swiotlb __read_mostly; 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 */ 34ec3cf2ecSBecky Bruce struct dma_mapping_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, 45ec3cf2ecSBecky Bruce .sync_sg_for_device = swiotlb_sync_sg_for_device 46ec3cf2ecSBecky Bruce }; 47ec3cf2ecSBecky Bruce 48ec3cf2ecSBecky Bruce struct dma_mapping_ops swiotlb_pci_dma_ops = { 49ec3cf2ecSBecky Bruce .alloc_coherent = dma_direct_alloc_coherent, 50ec3cf2ecSBecky Bruce .free_coherent = dma_direct_free_coherent, 51ec3cf2ecSBecky Bruce .map_sg = swiotlb_map_sg_attrs, 52ec3cf2ecSBecky Bruce .unmap_sg = swiotlb_unmap_sg_attrs, 53ec3cf2ecSBecky Bruce .dma_supported = swiotlb_dma_supported, 54ec3cf2ecSBecky Bruce .map_page = swiotlb_map_page, 55ec3cf2ecSBecky Bruce .unmap_page = swiotlb_unmap_page, 56ec3cf2ecSBecky Bruce .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu, 57ec3cf2ecSBecky Bruce .sync_single_range_for_device = swiotlb_sync_single_range_for_device, 58ec3cf2ecSBecky Bruce .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, 59ec3cf2ecSBecky Bruce .sync_sg_for_device = swiotlb_sync_sg_for_device 60ec3cf2ecSBecky Bruce }; 61ec3cf2ecSBecky Bruce 62762afb73SFUJITA Tomonori void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev) 63762afb73SFUJITA Tomonori { 64762afb73SFUJITA Tomonori struct pci_controller *hose; 65762afb73SFUJITA Tomonori struct dev_archdata *sd; 66762afb73SFUJITA Tomonori 67762afb73SFUJITA Tomonori hose = pci_bus_to_host(pdev->bus); 68762afb73SFUJITA Tomonori sd = &pdev->dev.archdata; 69762afb73SFUJITA Tomonori sd->max_direct_dma_addr = 70762afb73SFUJITA Tomonori hose->dma_window_base_cur + hose->dma_window_size; 71762afb73SFUJITA Tomonori } 72762afb73SFUJITA Tomonori 73ec3cf2ecSBecky Bruce static int ppc_swiotlb_bus_notify(struct notifier_block *nb, 74ec3cf2ecSBecky Bruce unsigned long action, void *data) 75ec3cf2ecSBecky Bruce { 76ec3cf2ecSBecky Bruce struct device *dev = data; 77762afb73SFUJITA Tomonori struct dev_archdata *sd; 78ec3cf2ecSBecky Bruce 79ec3cf2ecSBecky Bruce /* We are only intereted in device addition */ 80ec3cf2ecSBecky Bruce if (action != BUS_NOTIFY_ADD_DEVICE) 81ec3cf2ecSBecky Bruce return 0; 82ec3cf2ecSBecky Bruce 83762afb73SFUJITA Tomonori sd = &dev->archdata; 84762afb73SFUJITA Tomonori sd->max_direct_dma_addr = 0; 85762afb73SFUJITA Tomonori 86ec3cf2ecSBecky Bruce /* May need to bounce if the device can't address all of DRAM */ 87ec3cf2ecSBecky Bruce if (dma_get_mask(dev) < lmb_end_of_DRAM()) 88ec3cf2ecSBecky Bruce set_dma_ops(dev, &swiotlb_dma_ops); 89ec3cf2ecSBecky Bruce 90ec3cf2ecSBecky Bruce return NOTIFY_DONE; 91ec3cf2ecSBecky Bruce } 92ec3cf2ecSBecky Bruce 93ec3cf2ecSBecky Bruce static struct notifier_block ppc_swiotlb_plat_bus_notifier = { 94ec3cf2ecSBecky Bruce .notifier_call = ppc_swiotlb_bus_notify, 95ec3cf2ecSBecky Bruce .priority = 0, 96ec3cf2ecSBecky Bruce }; 97ec3cf2ecSBecky Bruce 98ec3cf2ecSBecky Bruce static struct notifier_block ppc_swiotlb_of_bus_notifier = { 99ec3cf2ecSBecky Bruce .notifier_call = ppc_swiotlb_bus_notify, 100ec3cf2ecSBecky Bruce .priority = 0, 101ec3cf2ecSBecky Bruce }; 102ec3cf2ecSBecky Bruce 103ec3cf2ecSBecky Bruce int __init swiotlb_setup_bus_notifier(void) 104ec3cf2ecSBecky Bruce { 105ec3cf2ecSBecky Bruce bus_register_notifier(&platform_bus_type, 106ec3cf2ecSBecky Bruce &ppc_swiotlb_plat_bus_notifier); 107ec3cf2ecSBecky Bruce bus_register_notifier(&of_platform_bus_type, 108ec3cf2ecSBecky Bruce &ppc_swiotlb_of_bus_notifier); 109ec3cf2ecSBecky Bruce 110ec3cf2ecSBecky Bruce return 0; 111ec3cf2ecSBecky Bruce } 112