Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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 0000000..b1d66ac
--- /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);