| /* |
| * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation |
| * |
| * Rewrite, cleanup: |
| * |
| * Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation |
| * |
| * Dynamic DMA mapping support, iSeries-specific parts. |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/list.h> |
| |
| #include <asm/iommu.h> |
| #include <asm/tce.h> |
| #include <asm/machdep.h> |
| #include <asm/abs_addr.h> |
| #include <asm/pci-bridge.h> |
| #include <asm/iseries/hv_call_xm.h> |
| |
| extern struct list_head iSeries_Global_Device_List; |
| |
| |
| static void tce_build_iSeries(struct iommu_table *tbl, long index, long npages, |
| unsigned long uaddr, enum dma_data_direction direction) |
| { |
| u64 rc; |
| union tce_entry tce; |
| |
| index <<= TCE_PAGE_FACTOR; |
| npages <<= TCE_PAGE_FACTOR; |
| |
| while (npages--) { |
| tce.te_word = 0; |
| tce.te_bits.tb_rpn = virt_to_abs(uaddr) >> TCE_SHIFT; |
| |
| if (tbl->it_type == TCE_VB) { |
| /* Virtual Bus */ |
| tce.te_bits.tb_valid = 1; |
| tce.te_bits.tb_allio = 1; |
| if (direction != DMA_TO_DEVICE) |
| tce.te_bits.tb_rdwr = 1; |
| } else { |
| /* PCI Bus */ |
| tce.te_bits.tb_rdwr = 1; /* Read allowed */ |
| if (direction != DMA_TO_DEVICE) |
| tce.te_bits.tb_pciwr = 1; |
| } |
| |
| rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, |
| tce.te_word); |
| if (rc) |
| panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n", |
| rc); |
| index++; |
| uaddr += TCE_PAGE_SIZE; |
| } |
| } |
| |
| static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages) |
| { |
| u64 rc; |
| |
| npages <<= TCE_PAGE_FACTOR; |
| index <<= TCE_PAGE_FACTOR; |
| |
| while (npages--) { |
| rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, 0); |
| if (rc) |
| panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n", |
| rc); |
| index++; |
| } |
| } |
| |
| /* |
| * Call Hv with the architected data structure to get TCE table info. |
| * info. Put the returned data into the Linux representation of the |
| * TCE table data. |
| * The Hardware Tce table comes in three flavors. |
| * 1. TCE table shared between Buses. |
| * 2. TCE table per Bus. |
| * 3. TCE Table per IOA. |
| */ |
| void iommu_table_getparms_iSeries(unsigned long busno, |
| unsigned char slotno, |
| unsigned char virtbus, |
| struct iommu_table* tbl) |
| { |
| struct iommu_table_cb *parms; |
| |
| parms = kmalloc(sizeof(*parms), GFP_KERNEL); |
| if (parms == NULL) |
| panic("PCI_DMA: TCE Table Allocation failed."); |
| |
| memset(parms, 0, sizeof(*parms)); |
| |
| parms->itc_busno = busno; |
| parms->itc_slotno = slotno; |
| parms->itc_virtbus = virtbus; |
| |
| HvCallXm_getTceTableParms(iseries_hv_addr(parms)); |
| |
| if (parms->itc_size == 0) |
| panic("PCI_DMA: parms->size is zero, parms is 0x%p", parms); |
| |
| /* itc_size is in pages worth of table, it_size is in # of entries */ |
| tbl->it_size = ((parms->itc_size * TCE_PAGE_SIZE) / |
| sizeof(union tce_entry)) >> TCE_PAGE_FACTOR; |
| tbl->it_busno = parms->itc_busno; |
| tbl->it_offset = parms->itc_offset >> TCE_PAGE_FACTOR; |
| tbl->it_index = parms->itc_index; |
| tbl->it_blocksize = 1; |
| tbl->it_type = virtbus ? TCE_VB : TCE_PCI; |
| |
| kfree(parms); |
| } |
| |
| |
| #ifdef CONFIG_PCI |
| /* |
| * This function compares the known tables to find an iommu_table |
| * that has already been built for hardware TCEs. |
| */ |
| static struct iommu_table *iommu_table_find(struct iommu_table * tbl) |
| { |
| struct pci_dn *pdn; |
| |
| list_for_each_entry(pdn, &iSeries_Global_Device_List, Device_List) { |
| struct iommu_table *it = pdn->iommu_table; |
| if ((it != NULL) && |
| (it->it_type == TCE_PCI) && |
| (it->it_offset == tbl->it_offset) && |
| (it->it_index == tbl->it_index) && |
| (it->it_size == tbl->it_size)) |
| return it; |
| } |
| return NULL; |
| } |
| |
| |
| void iommu_devnode_init_iSeries(struct device_node *dn) |
| { |
| struct iommu_table *tbl; |
| struct pci_dn *pdn = PCI_DN(dn); |
| |
| tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL); |
| |
| iommu_table_getparms_iSeries(pdn->busno, pdn->LogicalSlot, 0, tbl); |
| |
| /* Look for existing tce table */ |
| pdn->iommu_table = iommu_table_find(tbl); |
| if (pdn->iommu_table == NULL) |
| pdn->iommu_table = iommu_init_table(tbl); |
| else |
| kfree(tbl); |
| } |
| #endif |
| |
| static void iommu_dev_setup_iSeries(struct pci_dev *dev) { } |
| static void iommu_bus_setup_iSeries(struct pci_bus *bus) { } |
| |
| void iommu_init_early_iSeries(void) |
| { |
| ppc_md.tce_build = tce_build_iSeries; |
| ppc_md.tce_free = tce_free_iSeries; |
| |
| ppc_md.iommu_dev_setup = iommu_dev_setup_iSeries; |
| ppc_md.iommu_bus_setup = iommu_bus_setup_iSeries; |
| |
| pci_iommu_init(); |
| } |