2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
6 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, 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/abs_addr.h>
34 #include <asm/pci-bridge.h>
35 #include <asm/iseries/hv_call_xm.h>
36 #include <asm/iseries/iommu.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)
47 index <<= TCE_PAGE_FACTOR;
48 npages <<= TCE_PAGE_FACTOR;
52 tce.te_bits.tb_rpn = virt_to_abs(uaddr) >> TCE_SHIFT;
54 if (tbl->it_type == TCE_VB) {
56 tce.te_bits.tb_valid = 1;
57 tce.te_bits.tb_allio = 1;
58 if (direction != DMA_TO_DEVICE)
59 tce.te_bits.tb_rdwr = 1;
62 tce.te_bits.tb_rdwr = 1; /* Read allowed */
63 if (direction != DMA_TO_DEVICE)
64 tce.te_bits.tb_pciwr = 1;
67 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index,
70 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
73 uaddr += TCE_PAGE_SIZE;
77 static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages)
81 npages <<= TCE_PAGE_FACTOR;
82 index <<= TCE_PAGE_FACTOR;
85 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, 0);
87 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
94 * Call Hv with the architected data structure to get TCE table info.
95 * info. Put the returned data into the Linux representation of the
97 * The Hardware Tce table comes in three flavors.
98 * 1. TCE table shared between Buses.
99 * 2. TCE table per Bus.
100 * 3. TCE Table per IOA.
102 void iommu_table_getparms_iSeries(unsigned long busno,
103 unsigned char slotno,
104 unsigned char virtbus,
105 struct iommu_table* tbl)
107 struct iommu_table_cb *parms;
109 parms = kmalloc(sizeof(*parms), GFP_KERNEL);
111 panic("PCI_DMA: TCE Table Allocation failed.");
113 memset(parms, 0, sizeof(*parms));
115 parms->itc_busno = busno;
116 parms->itc_slotno = slotno;
117 parms->itc_virtbus = virtbus;
119 HvCallXm_getTceTableParms(iseries_hv_addr(parms));
121 if (parms->itc_size == 0)
122 panic("PCI_DMA: parms->size is zero, parms is 0x%p", parms);
124 /* itc_size is in pages worth of table, it_size is in # of entries */
125 tbl->it_size = ((parms->itc_size * TCE_PAGE_SIZE) /
126 sizeof(union tce_entry)) >> TCE_PAGE_FACTOR;
127 tbl->it_busno = parms->itc_busno;
128 tbl->it_offset = parms->itc_offset >> TCE_PAGE_FACTOR;
129 tbl->it_index = parms->itc_index;
130 tbl->it_blocksize = 1;
131 tbl->it_type = virtbus ? TCE_VB : TCE_PCI;
139 * This function compares the known tables to find an iommu_table
140 * that has already been built for hardware TCEs.
142 static struct iommu_table *iommu_table_find(struct iommu_table * tbl)
146 list_for_each_entry(pdn, &iSeries_Global_Device_List, Device_List) {
147 struct iommu_table *it = pdn->iommu_table;
149 (it->it_type == TCE_PCI) &&
150 (it->it_offset == tbl->it_offset) &&
151 (it->it_index == tbl->it_index) &&
152 (it->it_size == tbl->it_size))
159 void iommu_devnode_init_iSeries(struct device_node *dn)
161 struct iommu_table *tbl;
162 struct pci_dn *pdn = PCI_DN(dn);
164 tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
166 iommu_table_getparms_iSeries(pdn->busno, pdn->LogicalSlot, 0, tbl);
168 /* Look for existing tce table */
169 pdn->iommu_table = iommu_table_find(tbl);
170 if (pdn->iommu_table == NULL)
171 pdn->iommu_table = iommu_init_table(tbl);
177 static void iommu_dev_setup_iSeries(struct pci_dev *dev) { }
178 static void iommu_bus_setup_iSeries(struct pci_bus *bus) { }
180 void iommu_init_early_iSeries(void)
182 ppc_md.tce_build = tce_build_iSeries;
183 ppc_md.tce_free = tce_free_iSeries;
185 ppc_md.iommu_dev_setup = iommu_dev_setup_iSeries;
186 ppc_md.iommu_bus_setup = iommu_bus_setup_iSeries;