2 * arch/ppc64/kernel/iSeries_iommu.c
4 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
8 * Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation
10 * Dynamic DMA mapping support, iSeries-specific parts.
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 #include <linux/types.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/list.h>
32 #include <asm/iommu.h>
34 #include <asm/machdep.h>
35 #include <asm/iSeries/HvCallXm.h>
36 #include <asm/iSeries/iSeries_pci.h>
38 extern struct list_head iSeries_Global_Device_List;
41 static void tce_build_iSeries(struct iommu_table *tbl, long index, long npages,
42 unsigned long uaddr, enum dma_data_direction direction)
49 tce.te_bits.tb_rpn = virt_to_abs(uaddr) >> PAGE_SHIFT;
51 if (tbl->it_type == TCE_VB) {
53 tce.te_bits.tb_valid = 1;
54 tce.te_bits.tb_allio = 1;
55 if (direction != DMA_TO_DEVICE)
56 tce.te_bits.tb_rdwr = 1;
59 tce.te_bits.tb_rdwr = 1; /* Read allowed */
60 if (direction != DMA_TO_DEVICE)
61 tce.te_bits.tb_pciwr = 1;
64 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index,
67 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
74 static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages)
79 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, 0);
81 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
89 * This function compares the known tables to find an iommu_table
90 * that has already been built for hardware TCEs.
92 static struct iommu_table *iommu_table_find(struct iommu_table * tbl)
94 struct iSeries_Device_Node *dp;
96 list_for_each_entry(dp, &iSeries_Global_Device_List, Device_List) {
97 if ((dp->iommu_table != NULL) &&
98 (dp->iommu_table->it_type == TCE_PCI) &&
99 (dp->iommu_table->it_offset == tbl->it_offset) &&
100 (dp->iommu_table->it_index == tbl->it_index) &&
101 (dp->iommu_table->it_size == tbl->it_size))
102 return dp->iommu_table;
108 * Call Hv with the architected data structure to get TCE table info.
109 * info. Put the returned data into the Linux representation of the
111 * The Hardware Tce table comes in three flavors.
112 * 1. TCE table shared between Buses.
113 * 2. TCE table per Bus.
114 * 3. TCE Table per IOA.
116 static void iommu_table_getparms(struct iSeries_Device_Node* dn,
117 struct iommu_table* tbl)
119 struct iommu_table_cb *parms;
121 parms = kmalloc(sizeof(*parms), GFP_KERNEL);
123 panic("PCI_DMA: TCE Table Allocation failed.");
125 memset(parms, 0, sizeof(*parms));
127 parms->itc_busno = ISERIES_BUS(dn);
128 parms->itc_slotno = dn->LogicalSlot;
129 parms->itc_virtbus = 0;
131 HvCallXm_getTceTableParms(ISERIES_HV_ADDR(parms));
133 if (parms->itc_size == 0)
134 panic("PCI_DMA: parms->size is zero, parms is 0x%p", parms);
136 /* itc_size is in pages worth of table, it_size is in # of entries */
137 tbl->it_size = (parms->itc_size * PAGE_SIZE) / sizeof(union tce_entry);
138 tbl->it_busno = parms->itc_busno;
139 tbl->it_offset = parms->itc_offset;
140 tbl->it_index = parms->itc_index;
141 tbl->it_blocksize = 1;
142 tbl->it_type = TCE_PCI;
148 void iommu_devnode_init_iSeries(struct iSeries_Device_Node *dn)
150 struct iommu_table *tbl;
152 tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
154 iommu_table_getparms(dn, tbl);
156 /* Look for existing tce table */
157 dn->iommu_table = iommu_table_find(tbl);
158 if (dn->iommu_table == NULL)
159 dn->iommu_table = iommu_init_table(tbl);
165 static void iommu_dev_setup_iSeries(struct pci_dev *dev) { }
166 static void iommu_bus_setup_iSeries(struct pci_bus *bus) { }
168 void iommu_init_early_iSeries(void)
170 ppc_md.tce_build = tce_build_iSeries;
171 ppc_md.tce_free = tce_free_iSeries;
173 ppc_md.iommu_dev_setup = iommu_dev_setup_iSeries;
174 ppc_md.iommu_bus_setup = iommu_bus_setup_iSeries;