--- /dev/null
+/*
+ * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
+ *
+ * Rewrite, cleanup:
+ *
+ * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, 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/tce.h>
+#include <asm/machdep.h>
+#include <asm/abs_addr.h>
+#include <asm/pci-bridge.h>
+#include <asm/iseries/hv_call_xm.h>
+
+#include "iommu.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;
+
+ index <<= TCE_PAGE_FACTOR;
+ npages <<= TCE_PAGE_FACTOR;
+
+ while (npages--) {
+ tce.te_word = 0;
+ tce.te_bits.tb_rpn = virt_to_abs(uaddr) >> TCE_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 += TCE_PAGE_SIZE;
+ }
+}
+
+static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages)
+{
+ u64 rc;
+
+ npages <<= TCE_PAGE_FACTOR;
+ index <<= TCE_PAGE_FACTOR;
+
+ 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++;
+ }
+}
+
+/*
+ * 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.
+ */
+void iommu_table_getparms_iSeries(unsigned long busno,
+ unsigned char slotno,
+ unsigned char virtbus,
+ 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 = busno;
+ parms->itc_slotno = slotno;
+ parms->itc_virtbus = virtbus;
+
+ 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 * TCE_PAGE_SIZE) /
+ sizeof(union tce_entry)) >> TCE_PAGE_FACTOR;
+ tbl->it_busno = parms->itc_busno;
+ tbl->it_offset = parms->itc_offset >> TCE_PAGE_FACTOR;
+ tbl->it_index = parms->itc_index;
+ tbl->it_blocksize = 1;
+ tbl->it_type = virtbus ? TCE_VB : TCE_PCI;
+
+ kfree(parms);
+}
+
+
+#ifdef CONFIG_PCI
+/*
+ * 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 pci_dn *pdn;
+
+ list_for_each_entry(pdn, &iSeries_Global_Device_List, Device_List) {
+ struct iommu_table *it = pdn->iommu_table;
+ if ((it != NULL) &&
+ (it->it_type == TCE_PCI) &&
+ (it->it_offset == tbl->it_offset) &&
+ (it->it_index == tbl->it_index) &&
+ (it->it_size == tbl->it_size))
+ return it;
+ }
+ return NULL;
+}
+
+
+void iommu_devnode_init_iSeries(struct device_node *dn)
+{
+ struct iommu_table *tbl;
+ struct pci_dn *pdn = PCI_DN(dn);
+
+ tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
+
+ iommu_table_getparms_iSeries(pdn->busno, pdn->LogicalSlot, 0, tbl);
+
+ /* Look for existing tce table */
+ pdn->iommu_table = iommu_table_find(tbl);
+ if (pdn->iommu_table == NULL)
+ pdn->iommu_table = iommu_init_table(tbl);
+ else
+ kfree(tbl);
+}
+#endif
+
+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();
+}
git://git.onelab.eu / linux-2.6.git / blobdiff