diff options
Diffstat (limited to 'arch/ia64/sn/pci/pcibr/pcibr_dma.c')
| -rw-r--r-- | arch/ia64/sn/pci/pcibr/pcibr_dma.c | 413 |
1 files changed, 0 insertions, 413 deletions
diff --git a/arch/ia64/sn/pci/pcibr/pcibr_dma.c b/arch/ia64/sn/pci/pcibr/pcibr_dma.c deleted file mode 100644 index 1e863b277ac9..000000000000 --- a/arch/ia64/sn/pci/pcibr/pcibr_dma.c +++ /dev/null @@ -1,413 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Copyright (C) 2001-2005 Silicon Graphics, Inc. All rights reserved. - */ - -#include <linux/types.h> -#include <linux/pci.h> -#include <linux/export.h> -#include <asm/sn/addrs.h> -#include <asm/sn/geo.h> -#include <asm/sn/pcibr_provider.h> -#include <asm/sn/pcibus_provider_defs.h> -#include <asm/sn/pcidev.h> -#include <asm/sn/pic.h> -#include <asm/sn/sn_sal.h> -#include <asm/sn/tiocp.h> -#include "tio.h" -#include "xtalk/xwidgetdev.h" -#include "xtalk/hubdev.h" - -extern int sn_ioif_inited; - -/* ===================================================================== - * DMA MANAGEMENT - * - * The Bridge ASIC provides three methods of doing DMA: via a "direct map" - * register available in 32-bit PCI space (which selects a contiguous 2G - * address space on some other widget), via "direct" addressing via 64-bit - * PCI space (all destination information comes from the PCI address, - * including transfer attributes), and via a "mapped" region that allows - * a bunch of different small mappings to be established with the PMU. - * - * For efficiency, we most prefer to use the 32bit direct mapping facility, - * since it requires no resource allocations. The advantage of using the - * PMU over the 64-bit direct is that single-cycle PCI addressing can be - * used; the advantage of using 64-bit direct over PMU addressing is that - * we do not have to allocate entries in the PMU. - */ - -static dma_addr_t -pcibr_dmamap_ate32(struct pcidev_info *info, - u64 paddr, size_t req_size, u64 flags, int dma_flags) -{ - - struct pcidev_info *pcidev_info = info->pdi_host_pcidev_info; - struct pcibus_info *pcibus_info = (struct pcibus_info *)pcidev_info-> - pdi_pcibus_info; - u8 internal_device = (PCI_SLOT(pcidev_info->pdi_host_pcidev_info-> - pdi_linux_pcidev->devfn)) - 1; - int ate_count; - int ate_index; - u64 ate_flags = flags | PCI32_ATE_V; - u64 ate; - u64 pci_addr; - u64 xio_addr; - u64 offset; - - /* PIC in PCI-X mode does not supports 32bit PageMap mode */ - if (IS_PIC_SOFT(pcibus_info) && IS_PCIX(pcibus_info)) { - return 0; - } - - /* Calculate the number of ATEs needed. */ - if (!(MINIMAL_ATE_FLAG(paddr, req_size))) { - ate_count = IOPG((IOPGSIZE - 1) /* worst case start offset */ - +req_size /* max mapping bytes */ - - 1) + 1; /* round UP */ - } else { /* assume requested target is page aligned */ - ate_count = IOPG(req_size /* max mapping bytes */ - - 1) + 1; /* round UP */ - } - - /* Get the number of ATEs required. */ - ate_index = pcibr_ate_alloc(pcibus_info, ate_count); - if (ate_index < 0) - return 0; - - /* In PCI-X mode, Prefetch not supported */ - if (IS_PCIX(pcibus_info)) - ate_flags &= ~(PCI32_ATE_PREF); - - if (SN_DMA_ADDRTYPE(dma_flags == SN_DMA_ADDR_PHYS)) - xio_addr = IS_PIC_SOFT(pcibus_info) ? PHYS_TO_DMA(paddr) : - PHYS_TO_TIODMA(paddr); - else - xio_addr = paddr; - - offset = IOPGOFF(xio_addr); - ate = ate_flags | (xio_addr - offset); - - /* If PIC, put the targetid in the ATE */ - if (IS_PIC_SOFT(pcibus_info)) { - ate |= (pcibus_info->pbi_hub_xid << PIC_ATE_TARGETID_SHFT); - } - - /* - * If we're mapping for MSI, set the MSI bit in the ATE. If it's a - * TIOCP based pci bus, we also need to set the PIO bit in the ATE. - */ - if (dma_flags & SN_DMA_MSI) { - ate |= PCI32_ATE_MSI; - if (IS_TIOCP_SOFT(pcibus_info)) - ate |= PCI32_ATE_PIO; - } - - ate_write(pcibus_info, ate_index, ate_count, ate); - - /* - * Set up the DMA mapped Address. - */ - pci_addr = PCI32_MAPPED_BASE + offset + IOPGSIZE * ate_index; - - /* - * If swap was set in device in pcibr_endian_set() - * we need to turn swapping on. - */ - if (pcibus_info->pbi_devreg[internal_device] & PCIBR_DEV_SWAP_DIR) - ATE_SWAP_ON(pci_addr); - - - return pci_addr; -} - -static dma_addr_t -pcibr_dmatrans_direct64(struct pcidev_info * info, u64 paddr, - u64 dma_attributes, int dma_flags) -{ - struct pcibus_info *pcibus_info = (struct pcibus_info *) - ((info->pdi_host_pcidev_info)->pdi_pcibus_info); - u64 pci_addr; - - /* Translate to Crosstalk View of Physical Address */ - if (SN_DMA_ADDRTYPE(dma_flags) == SN_DMA_ADDR_PHYS) - pci_addr = IS_PIC_SOFT(pcibus_info) ? - PHYS_TO_DMA(paddr) : - PHYS_TO_TIODMA(paddr); - else - pci_addr = paddr; - pci_addr |= dma_attributes; - - /* Handle Bus mode */ - if (IS_PCIX(pcibus_info)) - pci_addr &= ~PCI64_ATTR_PREF; - - /* Handle Bridge Chipset differences */ - if (IS_PIC_SOFT(pcibus_info)) { - pci_addr |= - ((u64) pcibus_info-> - pbi_hub_xid << PIC_PCI64_ATTR_TARG_SHFT); - } else - pci_addr |= (dma_flags & SN_DMA_MSI) ? - TIOCP_PCI64_CMDTYPE_MSI : - TIOCP_PCI64_CMDTYPE_MEM; - - /* If PCI mode, func zero uses VCHAN0, every other func uses VCHAN1 */ - if (!IS_PCIX(pcibus_info) && PCI_FUNC(info->pdi_linux_pcidev->devfn)) - pci_addr |= PCI64_ATTR_VIRTUAL; - - return pci_addr; -} - -static dma_addr_t -pcibr_dmatrans_direct32(struct pcidev_info * info, - u64 paddr, size_t req_size, u64 flags, int dma_flags) -{ - struct pcidev_info *pcidev_info = info->pdi_host_pcidev_info; - struct pcibus_info *pcibus_info = (struct pcibus_info *)pcidev_info-> - pdi_pcibus_info; - u64 xio_addr; - - u64 xio_base; - u64 offset; - u64 endoff; - - if (IS_PCIX(pcibus_info)) { - return 0; - } - - if (dma_flags & SN_DMA_MSI) - return 0; - - if (SN_DMA_ADDRTYPE(dma_flags) == SN_DMA_ADDR_PHYS) - xio_addr = IS_PIC_SOFT(pcibus_info) ? PHYS_TO_DMA(paddr) : - PHYS_TO_TIODMA(paddr); - else - xio_addr = paddr; - - xio_base = pcibus_info->pbi_dir_xbase; - offset = xio_addr - xio_base; - endoff = req_size + offset; - if ((req_size > (1ULL << 31)) || /* Too Big */ - (xio_addr < xio_base) || /* Out of range for mappings */ - (endoff > (1ULL << 31))) { /* Too Big */ - return 0; - } - - return PCI32_DIRECT_BASE | offset; -} - -/* - * Wrapper routine for freeing DMA maps - * DMA mappings for Direct 64 and 32 do not have any DMA maps. - */ -void -pcibr_dma_unmap(struct pci_dev *hwdev, dma_addr_t dma_handle, int direction) -{ - struct pcidev_info *pcidev_info = SN_PCIDEV_INFO(hwdev); - struct pcibus_info *pcibus_info = - (struct pcibus_info *)pcidev_info->pdi_pcibus_info; - - if (IS_PCI32_MAPPED(dma_handle)) { - int ate_index; - - ate_index = - IOPG((ATE_SWAP_OFF(dma_handle) - PCI32_MAPPED_BASE)); - pcibr_ate_free(pcibus_info, ate_index); - } -} - -/* - * On SN systems there is a race condition between a PIO read response and - * DMA's. In rare cases, the read response may beat the DMA, causing the - * driver to think that data in memory is complete and meaningful. This code - * eliminates that race. This routine is called by the PIO read routines - * after doing the read. For PIC this routine then forces a fake interrupt - * on another line, which is logically associated with the slot that the PIO - * is addressed to. It then spins while watching the memory location that - * the interrupt is targeted to. When the interrupt response arrives, we - * are sure that the DMA has landed in memory and it is safe for the driver - * to proceed. For TIOCP use the Device(x) Write Request Buffer Flush - * Bridge register since it ensures the data has entered the coherence domain, - * unlike the PIC Device(x) Write Request Buffer Flush register. - */ - -void sn_dma_flush(u64 addr) -{ - nasid_t nasid; - int is_tio; - int wid_num; - int i, j; - unsigned long flags; - u64 itte; - struct hubdev_info *hubinfo; - struct sn_flush_device_kernel *p; - struct sn_flush_device_common *common; - struct sn_flush_nasid_entry *flush_nasid_list; - - if (!sn_ioif_inited) - return; - - nasid = NASID_GET(addr); - if (-1 == nasid_to_cnodeid(nasid)) - return; - - hubinfo = (NODEPDA(nasid_to_cnodeid(nasid)))->pdinfo; - - BUG_ON(!hubinfo); - - flush_nasid_list = &hubinfo->hdi_flush_nasid_list; - if (flush_nasid_list->widget_p == NULL) - return; - - is_tio = (nasid & 1); - if (is_tio) { - int itte_index; - - if (TIO_HWIN(addr)) - itte_index = 0; - else if (TIO_BWIN_WINDOWNUM(addr)) - itte_index = TIO_BWIN_WINDOWNUM(addr); - else - itte_index = -1; - - if (itte_index >= 0) { - itte = flush_nasid_list->iio_itte[itte_index]; - if (! TIO_ITTE_VALID(itte)) - return; - wid_num = TIO_ITTE_WIDGET(itte); - } else - wid_num = TIO_SWIN_WIDGETNUM(addr); - } else { - if (BWIN_WINDOWNUM(addr)) { - itte = flush_nasid_list->iio_itte[BWIN_WINDOWNUM(addr)]; - wid_num = IIO_ITTE_WIDGET(itte); - } else - wid_num = SWIN_WIDGETNUM(addr); - } - if (flush_nasid_list->widget_p[wid_num] == NULL) - return; - p = &flush_nasid_list->widget_p[wid_num][0]; - - /* find a matching BAR */ - for (i = 0; i < DEV_PER_WIDGET; i++,p++) { - common = p->common; - for (j = 0; j < PCI_ROM_RESOURCE; j++) { - if (common->sfdl_bar_list[j].start == 0) - break; - if (addr >= common->sfdl_bar_list[j].start - && addr <= common->sfdl_bar_list[j].end) - break; - } - if (j < PCI_ROM_RESOURCE && common->sfdl_bar_list[j].start != 0) - break; - } - - /* if no matching BAR, return without doing anything. */ - if (i == DEV_PER_WIDGET) - return; - - /* - * For TIOCP use the Device(x) Write Request Buffer Flush Bridge - * register since it ensures the data has entered the coherence - * domain, unlike PIC. - */ - if (is_tio) { - /* - * Note: devices behind TIOCE should never be matched in the - * above code, and so the following code is PIC/CP centric. - * If CE ever needs the sn_dma_flush mechanism, we will have - * to account for that here and in tioce_bus_fixup(). - */ - u32 tio_id = HUB_L(TIO_IOSPACE_ADDR(nasid, TIO_NODE_ID)); - u32 revnum = XWIDGET_PART_REV_NUM(tio_id); - - /* TIOCP BRINGUP WAR (PV907516): Don't write buffer flush reg */ - if ((1 << XWIDGET_PART_REV_NUM_REV(revnum)) & PV907516) { - return; - } else { - pcireg_wrb_flush_get(common->sfdl_pcibus_info, - (common->sfdl_slot - 1)); - } - } else { - spin_lock_irqsave(&p->sfdl_flush_lock, flags); - *common->sfdl_flush_addr = 0; - - /* force an interrupt. */ - *(volatile u32 *)(common->sfdl_force_int_addr) = 1; - - /* wait for the interrupt to come back. */ - while (*(common->sfdl_flush_addr) != 0x10f) - cpu_relax(); - - /* okay, everything is synched up. */ - spin_unlock_irqrestore(&p->sfdl_flush_lock, flags); - } - return; -} - -/* - * DMA interfaces. Called from pci_dma.c routines. - */ - -dma_addr_t -pcibr_dma_map(struct pci_dev * hwdev, unsigned long phys_addr, size_t size, int dma_flags) -{ - dma_addr_t dma_handle; - struct pcidev_info *pcidev_info = SN_PCIDEV_INFO(hwdev); - - /* SN cannot support DMA addresses smaller than 32 bits. */ - if (hwdev->dma_mask < 0x7fffffff) { - return 0; - } - - if (hwdev->dma_mask == ~0UL) { - /* - * Handle the most common case: 64 bit cards. This - * call should always succeed. - */ - - dma_handle = pcibr_dmatrans_direct64(pcidev_info, phys_addr, - PCI64_ATTR_PREF, dma_flags); - } else { - /* Handle 32-63 bit cards via direct mapping */ - dma_handle = pcibr_dmatrans_direct32(pcidev_info, phys_addr, - size, 0, dma_flags); - if (!dma_handle) { - /* - * It is a 32 bit card and we cannot do direct mapping, - * so we use an ATE. - */ - - dma_handle = pcibr_dmamap_ate32(pcidev_info, phys_addr, - size, PCI32_ATE_PREF, - dma_flags); - } - } - - return dma_handle; -} - -dma_addr_t -pcibr_dma_map_consistent(struct pci_dev * hwdev, unsigned long phys_addr, - size_t size, int dma_flags) -{ - dma_addr_t dma_handle; - struct pcidev_info *pcidev_info = SN_PCIDEV_INFO(hwdev); - - if (hwdev->dev.coherent_dma_mask == ~0UL) { - dma_handle = pcibr_dmatrans_direct64(pcidev_info, phys_addr, - PCI64_ATTR_BAR, dma_flags); - } else { - dma_handle = (dma_addr_t) pcibr_dmamap_ate32(pcidev_info, - phys_addr, size, - PCI32_ATE_BAR, dma_flags); - } - - return dma_handle; -} - -EXPORT_SYMBOL(sn_dma_flush); |