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)
51 rpn = virt_to_abs(uaddr) >> TCE_SHIFT;
52 tce = (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;
54 if (tbl->it_type == TCE_VB) {
56 tce |= TCE_VALID|TCE_ALLIO;
57 if (direction != DMA_TO_DEVICE)
61 tce |= TCE_PCI_READ; /* Read allowed */
62 if (direction != DMA_TO_DEVICE)
66 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, tce);
68 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
71 uaddr += TCE_PAGE_SIZE;
75 static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages)
80 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, 0);
82 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
89 * Structure passed to HvCallXm_getTceTableParms
91 struct iommu_table_cb {
92 unsigned long itc_busno; /* Bus number for this tce table */
93 unsigned long itc_start; /* Will be NULL for secondary */
94 unsigned long itc_totalsize; /* Size (in pages) of whole table */
95 unsigned long itc_offset; /* Index into real tce table of the
96 start of our section */
97 unsigned long itc_size; /* Size (in pages) of our section */
98 unsigned long itc_index; /* Index of this tce table */
99 unsigned short itc_maxtables; /* Max num of tables for partition */
100 unsigned char itc_virtbus; /* Flag to indicate virtual bus */
101 unsigned char itc_slotno; /* IOA Tce Slot Index */
102 unsigned char itc_rsvd[4];
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 void iommu_table_getparms_iSeries(unsigned long busno,
115 unsigned char slotno,
116 unsigned char virtbus,
117 struct iommu_table* tbl)
119 struct iommu_table_cb *parms;
121 parms = kzalloc(sizeof(*parms), GFP_KERNEL);
123 panic("PCI_DMA: TCE Table Allocation failed.");
125 parms->itc_busno = busno;
126 parms->itc_slotno = slotno;
127 parms->itc_virtbus = virtbus;
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 * TCE_PAGE_SIZE) / TCE_ENTRY_SIZE;
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 = virtbus ? TCE_VB : TCE_PCI;
148 * This function compares the known tables to find an iommu_table
149 * that has already been built for hardware TCEs.
151 static struct iommu_table *iommu_table_find(struct iommu_table * tbl)
153 struct device_node *node;
155 for (node = NULL; (node = of_find_all_nodes(node)); ) {
156 struct pci_dn *pdn = PCI_DN(node);
157 struct iommu_table *it;
161 it = pdn->iommu_table;
163 (it->it_type == TCE_PCI) &&
164 (it->it_offset == tbl->it_offset) &&
165 (it->it_index == tbl->it_index) &&
166 (it->it_size == tbl->it_size)) {
175 void iommu_devnode_init_iSeries(struct pci_dev *pdev, struct device_node *dn)
177 struct iommu_table *tbl;
178 struct pci_dn *pdn = PCI_DN(dn);
179 const u32 *lsn = of_get_property(dn, "linux,logical-slot-number", NULL);
183 tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
185 iommu_table_getparms_iSeries(pdn->busno, *lsn, 0, tbl);
187 /* Look for existing tce table */
188 pdn->iommu_table = iommu_table_find(tbl);
189 if (pdn->iommu_table == NULL)
190 pdn->iommu_table = iommu_init_table(tbl, -1);
193 pdev->dev.archdata.dma_data = pdn->iommu_table;
197 static struct iommu_table veth_iommu_table;
198 static struct iommu_table vio_iommu_table;
200 void *iseries_hv_alloc(size_t size, dma_addr_t *dma_handle, gfp_t flag)
202 return iommu_alloc_coherent(&vio_iommu_table, size, dma_handle,
203 DMA_32BIT_MASK, flag, -1);
205 EXPORT_SYMBOL_GPL(iseries_hv_alloc);
207 void iseries_hv_free(size_t size, void *vaddr, dma_addr_t dma_handle)
209 iommu_free_coherent(&vio_iommu_table, size, vaddr, dma_handle);
211 EXPORT_SYMBOL_GPL(iseries_hv_free);
213 dma_addr_t iseries_hv_map(void *vaddr, size_t size,
214 enum dma_data_direction direction)
216 return iommu_map_single(&vio_iommu_table, vaddr, size,
217 DMA_32BIT_MASK, direction);
220 void iseries_hv_unmap(dma_addr_t dma_handle, size_t size,
221 enum dma_data_direction direction)
223 iommu_unmap_single(&vio_iommu_table, dma_handle, size, direction);
226 void __init iommu_vio_init(void)
228 iommu_table_getparms_iSeries(255, 0, 0xff, &veth_iommu_table);
229 veth_iommu_table.it_size /= 2;
230 vio_iommu_table = veth_iommu_table;
231 vio_iommu_table.it_offset += veth_iommu_table.it_size;
233 if (!iommu_init_table(&veth_iommu_table, -1))
234 printk("Virtual Bus VETH TCE table failed.\n");
235 if (!iommu_init_table(&vio_iommu_table, -1))
236 printk("Virtual Bus VIO TCE table failed.\n");
239 struct iommu_table *vio_build_iommu_table_iseries(struct vio_dev *dev)
241 if (strcmp(dev->type, "network") == 0)
242 return &veth_iommu_table;
243 return &vio_iommu_table;
246 void iommu_init_early_iSeries(void)
248 ppc_md.tce_build = tce_build_iSeries;
249 ppc_md.tce_free = tce_free_iSeries;
251 set_pci_dma_ops(&dma_iommu_ops);