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Viewing changes to arch/powerpc/platforms/cell/beat_iommu.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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arch/powerpc/platforms/cell/beat_iommu.c
 
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/*
 
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 * Support for IOMMU on Celleb platform.
 
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 *
 
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 * (C) Copyright 2006-2007 TOSHIBA CORPORATION
 
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 *
 
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 * This program is free software; you can redistribute it and/or modify
 
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 * it under the terms of the GNU General Public License as published by
 
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 * the Free Software Foundation; either version 2 of the License, or
 
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 * (at your option) any later version.
 
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 *
 
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 * This program is distributed in the hope that it will be useful,
 
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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 * GNU General Public License for more details.
 
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 *
 
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 * You should have received a copy of the GNU General Public License along
 
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 * with this program; if not, write to the Free Software Foundation, Inc.,
 
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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
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 */
 
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#include <linux/kernel.h>
 
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#include <linux/init.h>
 
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#include <linux/dma-mapping.h>
 
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#include <linux/pci.h>
 
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#include <linux/of_platform.h>
 
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#include <asm/machdep.h>
 
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#include "beat_wrapper.h"
 
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#define DMA_FLAGS 0xf800000000000000UL  /* r/w permitted, coherency required,
 
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                                           strongest order */
 
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static int __init find_dma_window(u64 *io_space_id, u64 *ioid,
 
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                                  u64 *base, u64 *size, u64 *io_page_size)
 
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{
 
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        struct device_node *dn;
 
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        const unsigned long *dma_window;
 
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        for_each_node_by_type(dn, "ioif") {
 
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                dma_window = of_get_property(dn, "toshiba,dma-window", NULL);
 
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                if (dma_window) {
 
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                        *io_space_id = (dma_window[0] >> 32) & 0xffffffffUL;
 
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                        *ioid = dma_window[0] & 0x7ffUL;
 
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                        *base = dma_window[1];
 
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                        *size = dma_window[2];
 
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                        *io_page_size = 1 << dma_window[3];
 
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                        of_node_put(dn);
 
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                        return 1;
 
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                }
 
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        }
 
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        return 0;
 
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}
 
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static unsigned long celleb_dma_direct_offset;
 
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static void __init celleb_init_direct_mapping(void)
 
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{
 
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        u64 lpar_addr, io_addr;
 
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        u64 io_space_id, ioid, dma_base, dma_size, io_page_size;
 
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        if (!find_dma_window(&io_space_id, &ioid, &dma_base, &dma_size,
 
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                             &io_page_size)) {
 
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                pr_info("No dma window found !\n");
 
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                return;
 
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        }
 
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        for (lpar_addr = 0; lpar_addr < dma_size; lpar_addr += io_page_size) {
 
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                io_addr = lpar_addr + dma_base;
 
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                (void)beat_put_iopte(io_space_id, io_addr, lpar_addr,
 
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                                     ioid, DMA_FLAGS);
 
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        }
 
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        celleb_dma_direct_offset = dma_base;
 
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}
 
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static void celleb_dma_dev_setup(struct device *dev)
 
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{
 
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        set_dma_ops(dev, &dma_direct_ops);
 
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        set_dma_offset(dev, celleb_dma_direct_offset);
 
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}
 
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static void celleb_pci_dma_dev_setup(struct pci_dev *pdev)
 
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{
 
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        celleb_dma_dev_setup(&pdev->dev);
 
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}
 
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static int celleb_of_bus_notify(struct notifier_block *nb,
 
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                                unsigned long action, void *data)
 
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{
 
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        struct device *dev = data;
 
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        /* We are only intereted in device addition */
 
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        if (action != BUS_NOTIFY_ADD_DEVICE)
 
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                return 0;
 
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        celleb_dma_dev_setup(dev);
 
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        return 0;
 
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}
 
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static struct notifier_block celleb_of_bus_notifier = {
 
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        .notifier_call = celleb_of_bus_notify
 
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};
 
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static int __init celleb_init_iommu(void)
 
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{
 
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        celleb_init_direct_mapping();
 
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        ppc_md.pci_dma_dev_setup = celleb_pci_dma_dev_setup;
 
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        bus_register_notifier(&platform_bus_type, &celleb_of_bus_notifier);
 
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        return 0;
 
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}
 
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machine_arch_initcall(celleb_beat, celleb_init_iommu);