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Diffstat (limited to 'arch/ia64/sn/pci/pcibr/pcibr_dma.c')
-rw-r--r--arch/ia64/sn/pci/pcibr/pcibr_dma.c379
1 files changed, 379 insertions, 0 deletions
diff --git a/arch/ia64/sn/pci/pcibr/pcibr_dma.c b/arch/ia64/sn/pci/pcibr/pcibr_dma.c
new file mode 100644
index 000000000000..b1d66ac065c8
--- /dev/null
+++ b/arch/ia64/sn/pci/pcibr/pcibr_dma.c
@@ -0,0 +1,379 @@
+/*
+ * 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) 2001-2004 Silicon Graphics, Inc. All rights reserved.
+ */
+
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/sn/geo.h>
+#include "xtalk/xwidgetdev.h"
+#include "xtalk/hubdev.h"
+#include "pci/pcibus_provider_defs.h"
+#include "pci/pcidev.h"
+#include "pci/tiocp.h"
+#include "pci/pic.h"
+#include "pci/pcibr_provider.h"
+#include "pci/tiocp.h"
+#include "tio.h"
+#include <asm/sn/addrs.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 uint64_t
+pcibr_dmamap_ate32(struct pcidev_info *info,
+ uint64_t paddr, size_t req_size, uint64_t flags)
+{
+
+ struct pcidev_info *pcidev_info = info->pdi_host_pcidev_info;
+ struct pcibus_info *pcibus_info = (struct pcibus_info *)pcidev_info->
+ pdi_pcibus_info;
+ uint8_t internal_device = (PCI_SLOT(pcidev_info->pdi_host_pcidev_info->
+ pdi_linux_pcidev->devfn)) - 1;
+ int ate_count;
+ int ate_index;
+ uint64_t ate_flags = flags | PCI32_ATE_V;
+ uint64_t ate;
+ uint64_t pci_addr;
+ uint64_t xio_addr;
+ uint64_t 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);
+
+ xio_addr =
+ IS_PIC_SOFT(pcibus_info) ? PHYS_TO_DMA(paddr) :
+ PHYS_TO_TIODMA(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);
+ }
+ 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 uint64_t
+pcibr_dmatrans_direct64(struct pcidev_info * info, uint64_t paddr,
+ uint64_t dma_attributes)
+{
+ struct pcibus_info *pcibus_info = (struct pcibus_info *)
+ ((info->pdi_host_pcidev_info)->pdi_pcibus_info);
+ uint64_t pci_addr;
+
+ /* Translate to Crosstalk View of Physical Address */
+ pci_addr = (IS_PIC_SOFT(pcibus_info) ? PHYS_TO_DMA(paddr) :
+ PHYS_TO_TIODMA(paddr)) | 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 |=
+ ((uint64_t) pcibus_info->
+ pbi_hub_xid << PIC_PCI64_ATTR_TARG_SHFT);
+ } else
+ pci_addr |= 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 uint64_t
+pcibr_dmatrans_direct32(struct pcidev_info * info,
+ uint64_t paddr, size_t req_size, uint64_t flags)
+{
+
+ struct pcidev_info *pcidev_info = info->pdi_host_pcidev_info;
+ struct pcibus_info *pcibus_info = (struct pcibus_info *)pcidev_info->
+ pdi_pcibus_info;
+ uint64_t xio_addr;
+
+ uint64_t xio_base;
+ uint64_t offset;
+ uint64_t endoff;
+
+ if (IS_PCIX(pcibus_info)) {
+ return 0;
+ }
+
+ xio_addr = IS_PIC_SOFT(pcibus_info) ? PHYS_TO_DMA(paddr) :
+ PHYS_TO_TIODMA(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 free'ing DMA maps
+ * DMA mappings for Direct 64 and 32 do not have any DMA maps.
+ */
+void
+pcibr_dma_unmap(struct pcidev_info *pcidev_info, dma_addr_t dma_handle,
+ int direction)
+{
+ 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 targetted 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(uint64_t addr)
+{
+ nasid_t nasid;
+ int is_tio;
+ int wid_num;
+ int i, j;
+ int bwin;
+ uint64_t flags;
+ struct hubdev_info *hubinfo;
+ volatile struct sn_flush_device_list *p;
+ 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;
+
+ if (!hubinfo) {
+ BUG();
+ }
+ is_tio = (nasid & 1);
+ if (is_tio) {
+ wid_num = TIO_SWIN_WIDGETNUM(addr);
+ bwin = TIO_BWIN_WINDOWNUM(addr);
+ } else {
+ wid_num = SWIN_WIDGETNUM(addr);
+ bwin = BWIN_WINDOWNUM(addr);
+ }
+
+ flush_nasid_list = &hubinfo->hdi_flush_nasid_list;
+ if (flush_nasid_list->widget_p == NULL)
+ return;
+ if (bwin > 0) {
+ uint64_t itte = flush_nasid_list->iio_itte[bwin];
+
+ if (is_tio) {
+ wid_num = (itte >> TIO_ITTE_WIDGET_SHIFT) &
+ TIO_ITTE_WIDGET_MASK;
+ } else {
+ wid_num = (itte >> IIO_ITTE_WIDGET_SHIFT) &
+ IIO_ITTE_WIDGET_MASK;
+ }
+ }
+ if (flush_nasid_list->widget_p == NULL)
+ return;
+ 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++) {
+ for (j = 0; j < PCI_ROM_RESOURCE; j++) {
+ if (p->sfdl_bar_list[j].start == 0)
+ break;
+ if (addr >= p->sfdl_bar_list[j].start
+ && addr <= p->sfdl_bar_list[j].end)
+ break;
+ }
+ if (j < PCI_ROM_RESOURCE && p->sfdl_bar_list[j].start != 0)
+ break;
+ p++;
+ }
+
+ /* 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) {
+ uint32_t tio_id = REMOTE_HUB_L(nasid, TIO_NODE_ID);
+ uint32_t 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(p->sfdl_pcibus_info,
+ (p->sfdl_slot - 1));
+ }
+ } else {
+ spin_lock_irqsave(&((struct sn_flush_device_list *)p)->
+ sfdl_flush_lock, flags);
+
+ p->sfdl_flush_value = 0;
+
+ /* force an interrupt. */
+ *(volatile uint32_t *)(p->sfdl_force_int_addr) = 1;
+
+ /* wait for the interrupt to come back. */
+ while (*(p->sfdl_flush_addr) != 0x10f) ;
+
+ /* okay, everything is synched up. */
+ spin_unlock_irqrestore((spinlock_t *)&p->sfdl_flush_lock, flags);
+ }
+ return;
+}
+
+/*
+ * Wrapper DMA interface. Called from pci_dma.c routines.
+ */
+
+uint64_t
+pcibr_dma_map(struct pcidev_info * pcidev_info, unsigned long phys_addr,
+ size_t size, unsigned int flags)
+{
+ dma_addr_t dma_handle;
+ struct pci_dev *pcidev = pcidev_info->pdi_linux_pcidev;
+
+ if (flags & SN_PCIDMA_CONSISTENT) {
+ /* sn_pci_alloc_consistent interfaces */
+ if (pcidev->dev.coherent_dma_mask == ~0UL) {
+ dma_handle =
+ pcibr_dmatrans_direct64(pcidev_info, phys_addr,
+ PCI64_ATTR_BAR);
+ } else {
+ dma_handle =
+ (dma_addr_t) pcibr_dmamap_ate32(pcidev_info,
+ phys_addr, size,
+ PCI32_ATE_BAR);
+ }
+ } else {
+ /* map_sg/map_single interfaces */
+
+ /* SN cannot support DMA addresses smaller than 32 bits. */
+ if (pcidev->dma_mask < 0x7fffffff) {
+ return 0;
+ }
+
+ if (pcidev->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);
+ } else {
+ /* Handle 32-63 bit cards via direct mapping */
+ dma_handle =
+ pcibr_dmatrans_direct32(pcidev_info, phys_addr,
+ size, 0);
+ 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);
+ }
+ }
+ }
+
+ return dma_handle;
+}
+
+EXPORT_SYMBOL(sn_dma_flush);