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