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/*
* arch/ppc64/kernel/iSeries_iommu.c
*
* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
*
* Rewrite, cleanup:
*
* Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation
*
* Dynamic DMA mapping support, iSeries-specific parts.
*
*
* 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/types.h>
#include <linux/dma-mapping.h>
#include <linux/list.h>
#include <asm/iommu.h>
#include <asm/machdep.h>
#include <asm/iSeries/HvCallXm.h>
#include <asm/iSeries/iSeries_pci.h>
extern struct list_head iSeries_Global_Device_List;
static void tce_build_iSeries(struct iommu_table *tbl, long index, long npages,
unsigned long uaddr, enum dma_data_direction direction)
{
u64 rc;
union tce_entry tce;
while (npages--) {
tce.te_word = 0;
tce.te_bits.tb_rpn = virt_to_abs(uaddr) >> PAGE_SHIFT;
if (tbl->it_type == TCE_VB) {
/* Virtual Bus */
tce.te_bits.tb_valid = 1;
tce.te_bits.tb_allio = 1;
if (direction != DMA_TO_DEVICE)
tce.te_bits.tb_rdwr = 1;
} else {
/* PCI Bus */
tce.te_bits.tb_rdwr = 1; /* Read allowed */
if (direction != DMA_TO_DEVICE)
tce.te_bits.tb_pciwr = 1;
}
rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index,
tce.te_word);
if (rc)
panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
rc);
index++;
uaddr += PAGE_SIZE;
}
}
static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages)
{
u64 rc;
while (npages--) {
rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, 0);
if (rc)
panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
rc);
index++;
}
}
/*
* This function compares the known tables to find an iommu_table
* that has already been built for hardware TCEs.
*/
static struct iommu_table *iommu_table_find(struct iommu_table * tbl)
{
struct iSeries_Device_Node *dp;
list_for_each_entry(dp, &iSeries_Global_Device_List, Device_List) {
if ((dp->iommu_table != NULL) &&
(dp->iommu_table->it_type == TCE_PCI) &&
(dp->iommu_table->it_offset == tbl->it_offset) &&
(dp->iommu_table->it_index == tbl->it_index) &&
(dp->iommu_table->it_size == tbl->it_size))
return dp->iommu_table;
}
return NULL;
}
/*
* Call Hv with the architected data structure to get TCE table info.
* info. Put the returned data into the Linux representation of the
* TCE table data.
* The Hardware Tce table comes in three flavors.
* 1. TCE table shared between Buses.
* 2. TCE table per Bus.
* 3. TCE Table per IOA.
*/
static void iommu_table_getparms(struct iSeries_Device_Node* dn,
struct iommu_table* tbl)
{
struct iommu_table_cb *parms;
parms = kmalloc(sizeof(*parms), GFP_KERNEL);
if (parms == NULL)
panic("PCI_DMA: TCE Table Allocation failed.");
memset(parms, 0, sizeof(*parms));
parms->itc_busno = ISERIES_BUS(dn);
parms->itc_slotno = dn->LogicalSlot;
parms->itc_virtbus = 0;
HvCallXm_getTceTableParms(ISERIES_HV_ADDR(parms));
if (parms->itc_size == 0)
panic("PCI_DMA: parms->size is zero, parms is 0x%p", parms);
/* itc_size is in pages worth of table, it_size is in # of entries */
tbl->it_size = (parms->itc_size * PAGE_SIZE) / sizeof(union tce_entry);
tbl->it_busno = parms->itc_busno;
tbl->it_offset = parms->itc_offset;
tbl->it_index = parms->itc_index;
tbl->it_blocksize = 1;
tbl->it_type = TCE_PCI;
kfree(parms);
}
void iommu_devnode_init_iSeries(struct iSeries_Device_Node *dn)
{
struct iommu_table *tbl;
tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
iommu_table_getparms(dn, tbl);
/* Look for existing tce table */
dn->iommu_table = iommu_table_find(tbl);
if (dn->iommu_table == NULL)
dn->iommu_table = iommu_init_table(tbl);
else
kfree(tbl);
}
static void iommu_dev_setup_iSeries(struct pci_dev *dev) { }
static void iommu_bus_setup_iSeries(struct pci_bus *bus) { }
void iommu_init_early_iSeries(void)
{
ppc_md.tce_build = tce_build_iSeries;
ppc_md.tce_free = tce_free_iSeries;
ppc_md.iommu_dev_setup = iommu_dev_setup_iSeries;
ppc_md.iommu_bus_setup = iommu_bus_setup_iSeries;
pci_iommu_init();
}
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