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>
30 #include <linux/pci.h>
31 #include <linux/module.h>
33 #include <asm/iommu.h>
36 #include <asm/machdep.h>
37 #include <asm/abs_addr.h>
39 #include <asm/pci-bridge.h>
40 #include <asm/iseries/hv_call_xm.h>
41 #include <asm/iseries/hv_call_event.h>
42 #include <asm/iseries/iommu.h>
44 static void tce_build_iSeries(struct iommu_table *tbl, long index, long npages,
45 unsigned long uaddr, enum dma_data_direction direction,
46 struct dma_attrs *attrs)
52 rpn = virt_to_abs(uaddr) >> TCE_SHIFT;
53 tce = (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;
55 if (tbl->it_type == TCE_VB) {
57 tce |= TCE_VALID|TCE_ALLIO;
58 if (direction != DMA_TO_DEVICE)
62 tce |= TCE_PCI_READ; /* Read allowed */
63 if (direction != DMA_TO_DEVICE)
67 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, tce);
69 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
72 uaddr += TCE_PAGE_SIZE;
76 static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages)
81 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, 0);
83 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
90 * Structure passed to HvCallXm_getTceTableParms
92 struct iommu_table_cb {
93 unsigned long itc_busno; /* Bus number for this tce table */
94 unsigned long itc_start; /* Will be NULL for secondary */
95 unsigned long itc_totalsize; /* Size (in pages) of whole table */
96 unsigned long itc_offset; /* Index into real tce table of the
97 start of our section */
98 unsigned long itc_size; /* Size (in pages) of our section */
99 unsigned long itc_index; /* Index of this tce table */
100 unsigned short itc_maxtables; /* Max num of tables for partition */
101 unsigned char itc_virtbus; /* Flag to indicate virtual bus */
102 unsigned char itc_slotno; /* IOA Tce Slot Index */
103 unsigned char itc_rsvd[4];
107 * Call Hv with the architected data structure to get TCE table info.
108 * info. Put the returned data into the Linux representation of the
110 * The Hardware Tce table comes in three flavors.
111 * 1. TCE table shared between Buses.
112 * 2. TCE table per Bus.
113 * 3. TCE Table per IOA.
115 void iommu_table_getparms_iSeries(unsigned long busno,
116 unsigned char slotno,
117 unsigned char virtbus,
118 struct iommu_table* tbl)
120 struct iommu_table_cb *parms;
122 parms = kzalloc(sizeof(*parms), GFP_KERNEL);
124 panic("PCI_DMA: TCE Table Allocation failed.");
126 parms->itc_busno = busno;
127 parms->itc_slotno = slotno;
128 parms->itc_virtbus = virtbus;
130 HvCallXm_getTceTableParms(iseries_hv_addr(parms));
132 if (parms->itc_size == 0)
133 panic("PCI_DMA: parms->size is zero, parms is 0x%p", parms);
135 /* itc_size is in pages worth of table, it_size is in # of entries */
136 tbl->it_size = (parms->itc_size * TCE_PAGE_SIZE) / TCE_ENTRY_SIZE;
137 tbl->it_busno = parms->itc_busno;
138 tbl->it_offset = parms->itc_offset;
139 tbl->it_index = parms->itc_index;
140 tbl->it_blocksize = 1;
141 tbl->it_type = virtbus ? TCE_VB : TCE_PCI;
149 * This function compares the known tables to find an iommu_table
150 * that has already been built for hardware TCEs.
152 static struct iommu_table *iommu_table_find(struct iommu_table * tbl)
154 struct device_node *node;
156 for (node = NULL; (node = of_find_all_nodes(node)); ) {
157 struct pci_dn *pdn = PCI_DN(node);
158 struct iommu_table *it;
162 it = pdn->iommu_table;
164 (it->it_type == TCE_PCI) &&
165 (it->it_offset == tbl->it_offset) &&
166 (it->it_index == tbl->it_index) &&
167 (it->it_size == tbl->it_size)) {
176 void iommu_devnode_init_iSeries(struct pci_dev *pdev, struct device_node *dn)
178 struct iommu_table *tbl;
179 struct pci_dn *pdn = PCI_DN(dn);
180 const u32 *lsn = of_get_property(dn, "linux,logical-slot-number", NULL);
184 tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
186 iommu_table_getparms_iSeries(pdn->busno, *lsn, 0, tbl);
188 /* Look for existing tce table */
189 pdn->iommu_table = iommu_table_find(tbl);
190 if (pdn->iommu_table == NULL)
191 pdn->iommu_table = iommu_init_table(tbl, -1);
194 pdev->dev.archdata.dma_data = pdn->iommu_table;
198 static struct iommu_table veth_iommu_table;
199 static struct iommu_table vio_iommu_table;
201 void *iseries_hv_alloc(size_t size, dma_addr_t *dma_handle, gfp_t flag)
203 return iommu_alloc_coherent(NULL, &vio_iommu_table, size, dma_handle,
204 DMA_32BIT_MASK, flag, -1);
206 EXPORT_SYMBOL_GPL(iseries_hv_alloc);
208 void iseries_hv_free(size_t size, void *vaddr, dma_addr_t dma_handle)
210 iommu_free_coherent(&vio_iommu_table, size, vaddr, dma_handle);
212 EXPORT_SYMBOL_GPL(iseries_hv_free);
214 dma_addr_t iseries_hv_map(void *vaddr, size_t size,
215 enum dma_data_direction direction)
217 return iommu_map_single(NULL, &vio_iommu_table, vaddr, size,
218 DMA_32BIT_MASK, direction, NULL);
221 void iseries_hv_unmap(dma_addr_t dma_handle, size_t size,
222 enum dma_data_direction direction)
224 iommu_unmap_single(&vio_iommu_table, dma_handle, size, direction, NULL);
227 void __init iommu_vio_init(void)
229 iommu_table_getparms_iSeries(255, 0, 0xff, &veth_iommu_table);
230 veth_iommu_table.it_size /= 2;
231 vio_iommu_table = veth_iommu_table;
232 vio_iommu_table.it_offset += veth_iommu_table.it_size;
234 if (!iommu_init_table(&veth_iommu_table, -1))
235 printk("Virtual Bus VETH TCE table failed.\n");
236 if (!iommu_init_table(&vio_iommu_table, -1))
237 printk("Virtual Bus VIO TCE table failed.\n");
240 struct iommu_table *vio_build_iommu_table_iseries(struct vio_dev *dev)
242 if (strcmp(dev->type, "network") == 0)
243 return &veth_iommu_table;
244 return &vio_iommu_table;
247 void iommu_init_early_iSeries(void)
249 ppc_md.tce_build = tce_build_iSeries;
250 ppc_md.tce_free = tce_free_iSeries;
252 set_pci_dma_ops(&dma_iommu_ops);