2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
6 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
7 * Copyright (C) 2006 Olof Johansson <olof@lixom.net>
9 * Dynamic DMA mapping support, iSeries-specific parts.
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #include <linux/types.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/list.h>
31 #include <asm/iommu.h>
33 #include <asm/machdep.h>
34 #include <asm/abs_addr.h>
36 #include <asm/pci-bridge.h>
37 #include <asm/iseries/hv_call_xm.h>
38 #include <asm/iseries/iommu.h>
40 static void tce_build_iSeries(struct iommu_table *tbl, long index, long npages,
41 unsigned long uaddr, enum dma_data_direction direction)
47 rpn = virt_to_abs(uaddr) >> TCE_SHIFT;
48 tce = (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;
50 if (tbl->it_type == TCE_VB) {
52 tce |= TCE_VALID|TCE_ALLIO;
53 if (direction != DMA_TO_DEVICE)
57 tce |= TCE_PCI_READ; /* Read allowed */
58 if (direction != DMA_TO_DEVICE)
62 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, tce);
64 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
67 uaddr += TCE_PAGE_SIZE;
71 static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages)
76 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, 0);
78 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
85 * Structure passed to HvCallXm_getTceTableParms
87 struct iommu_table_cb {
88 unsigned long itc_busno; /* Bus number for this tce table */
89 unsigned long itc_start; /* Will be NULL for secondary */
90 unsigned long itc_totalsize; /* Size (in pages) of whole table */
91 unsigned long itc_offset; /* Index into real tce table of the
92 start of our section */
93 unsigned long itc_size; /* Size (in pages) of our section */
94 unsigned long itc_index; /* Index of this tce table */
95 unsigned short itc_maxtables; /* Max num of tables for partition */
96 unsigned char itc_virtbus; /* Flag to indicate virtual bus */
97 unsigned char itc_slotno; /* IOA Tce Slot Index */
98 unsigned char itc_rsvd[4];
102 * Call Hv with the architected data structure to get TCE table info.
103 * info. Put the returned data into the Linux representation of the
105 * The Hardware Tce table comes in three flavors.
106 * 1. TCE table shared between Buses.
107 * 2. TCE table per Bus.
108 * 3. TCE Table per IOA.
110 void iommu_table_getparms_iSeries(unsigned long busno,
111 unsigned char slotno,
112 unsigned char virtbus,
113 struct iommu_table* tbl)
115 struct iommu_table_cb *parms;
117 parms = kmalloc(sizeof(*parms), GFP_KERNEL);
119 panic("PCI_DMA: TCE Table Allocation failed.");
121 memset(parms, 0, sizeof(*parms));
123 parms->itc_busno = busno;
124 parms->itc_slotno = slotno;
125 parms->itc_virtbus = virtbus;
127 HvCallXm_getTceTableParms(iseries_hv_addr(parms));
129 if (parms->itc_size == 0)
130 panic("PCI_DMA: parms->size is zero, parms is 0x%p", parms);
132 /* itc_size is in pages worth of table, it_size is in # of entries */
133 tbl->it_size = (parms->itc_size * TCE_PAGE_SIZE) / TCE_ENTRY_SIZE;
134 tbl->it_busno = parms->itc_busno;
135 tbl->it_offset = parms->itc_offset;
136 tbl->it_index = parms->itc_index;
137 tbl->it_blocksize = 1;
138 tbl->it_type = virtbus ? TCE_VB : TCE_PCI;
146 * This function compares the known tables to find an iommu_table
147 * that has already been built for hardware TCEs.
149 static struct iommu_table *iommu_table_find(struct iommu_table * tbl)
151 struct device_node *node;
153 for (node = NULL; (node = of_find_all_nodes(node)); ) {
154 struct pci_dn *pdn = PCI_DN(node);
155 struct iommu_table *it;
159 it = pdn->iommu_table;
161 (it->it_type == TCE_PCI) &&
162 (it->it_offset == tbl->it_offset) &&
163 (it->it_index == tbl->it_index) &&
164 (it->it_size == tbl->it_size))
171 void iommu_devnode_init_iSeries(struct device_node *dn)
173 struct iommu_table *tbl;
174 struct pci_dn *pdn = PCI_DN(dn);
175 const u32 *lsn = get_property(dn, "linux,logical-slot-number", NULL);
179 tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
181 iommu_table_getparms_iSeries(pdn->busno, *lsn, 0, tbl);
183 /* Look for existing tce table */
184 pdn->iommu_table = iommu_table_find(tbl);
185 if (pdn->iommu_table == NULL)
186 pdn->iommu_table = iommu_init_table(tbl, -1);
192 static void iommu_dev_setup_iSeries(struct pci_dev *dev) { }
193 static void iommu_bus_setup_iSeries(struct pci_bus *bus) { }
195 void iommu_init_early_iSeries(void)
197 ppc_md.tce_build = tce_build_iSeries;
198 ppc_md.tce_free = tce_free_iSeries;
200 ppc_md.iommu_dev_setup = iommu_dev_setup_iSeries;
201 ppc_md.iommu_bus_setup = iommu_bus_setup_iSeries;