105 lines
2.7 KiB
C
105 lines
2.7 KiB
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 <asm/of_platform.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 = 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 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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dma_direct_offset = dma_base;
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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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dev->archdata.dma_ops = pci_dma_ops;
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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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if (!machine_is(celleb))
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return -ENODEV;
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celleb_init_direct_mapping();
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pci_dma_ops = &dma_direct_ops;
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bus_register_notifier(&of_platform_bus_type, &celleb_of_bus_notifier);
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return 0;
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}
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arch_initcall(celleb_init_iommu);
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