path: root/arch/powerpc/platforms/pseries/iommu.c

/*
 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
 *
 * Rewrite, cleanup:
 *
 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
 * Copyright (C) 2006 Olof Johansson <olof@lixom.net>
 *
 * Dynamic DMA mapping support, pSeries-specific parts, both SMP and LPAR.
 *
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/sched.h>	/* for show_stack */
#include <linux/string.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/crash_dump.h>
#include <linux/memory.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/iommu.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/abs_addr.h>
#include <asm/pSeries_reconfig.h>
#include <asm/firmware.h>
#include <asm/tce.h>
#include <asm/ppc-pci.h>
#include <asm/udbg.h>
#include <asm/mmzone.h>

#include "plpar_wrappers.h"


static int tce_build_pSeries(struct iommu_table *tbl, long index,
			      long npages, unsigned long uaddr,
			      enum dma_data_direction direction,
			      struct dma_attrs *attrs)
{
	u64 proto_tce;
	u64 *tcep;
	u64 rpn;

	proto_tce = TCE_PCI_READ; // Read allowed

	if (direction != DMA_TO_DEVICE)
		proto_tce |= TCE_PCI_WRITE;

	tcep = ((u64 *)tbl->it_base) + index;

	while (npages--) {
		/* can't move this out since we might cross MEMBLOCK boundary */
		rpn = (virt_to_abs(uaddr)) >> TCE_SHIFT;
		*tcep = proto_tce | (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;

		uaddr += TCE_PAGE_SIZE;
		tcep++;
	}
	return 0;
}


static void tce_free_pSeries(struct iommu_table *tbl, long index, long npages)
{
	u64 *tcep;

	tcep = ((u64 *)tbl->it_base) + index;

	while (npages--)
		*(tcep++) = 0;
}

static unsigned long tce_get_pseries(struct iommu_table *tbl, long index)
{
	u64 *tcep;

	tcep = ((u64 *)tbl->it_base) + index;

	return *tcep;
}

static void tce_free_pSeriesLP(struct iommu_table*, long, long);
static void tce_freemulti_pSeriesLP(struct iommu_table*, long, long);

static int tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum,
				long npages,