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-rw-r--r--arch/ia64/sn/pci/pci_dma.c481
1 files changed, 481 insertions, 0 deletions
diff --git a/arch/ia64/sn/pci/pci_dma.c b/arch/ia64/sn/pci/pci_dma.c
new file mode 100644
index 000000000..74c934a99
--- /dev/null
+++ b/arch/ia64/sn/pci/pci_dma.c
@@ -0,0 +1,481 @@
+/*
+ * 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) 2000,2002-2005 Silicon Graphics, Inc. All rights reserved.
+ *
+ * Routines for PCI DMA mapping. See Documentation/DMA-API.txt for
+ * a description of how these routines should be used.
+ */
+
+#include <linux/gfp.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <asm/dma.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/pcibus_provider_defs.h>
+#include <asm/sn/pcidev.h>
+#include <asm/sn/sn_sal.h>
+
+#define SG_ENT_VIRT_ADDRESS(sg) (sg_virt((sg)))
+#define SG_ENT_PHYS_ADDRESS(SG) virt_to_phys(SG_ENT_VIRT_ADDRESS(SG))
+
+/**
+ * sn_dma_supported - test a DMA mask
+ * @dev: device to test
+ * @mask: DMA mask to test
+ *
+ * Return whether the given PCI device DMA address mask can be supported
+ * properly. For example, if your device can only drive the low 24-bits
+ * during PCI bus mastering, then you would pass 0x00ffffff as the mask to
+ * this function. Of course, SN only supports devices that have 32 or more
+ * address bits when using the PMU.
+ */
+static int sn_dma_supported(struct device *dev, u64 mask)
+{
+ BUG_ON(!dev_is_pci(dev));
+
+ if (mask < 0x7fffffff)
+ return 0;
+ return 1;
+}
+
+/**
+ * sn_dma_set_mask - set the DMA mask
+ * @dev: device to set
+ * @dma_mask: new mask
+ *
+ * Set @dev's DMA mask if the hw supports it.
+ */
+int sn_dma_set_mask(struct device *dev, u64 dma_mask)
+{
+ BUG_ON(!dev_is_pci(dev));
+
+ if (!sn_dma_supported(dev, dma_mask))
+ return 0;
+
+ *dev->dma_mask = dma_mask;
+ return 1;
+}
+EXPORT_SYMBOL(sn_dma_set_mask);
+
+/**
+ * sn_dma_alloc_coherent - allocate memory for coherent DMA
+ * @dev: device to allocate for
+ * @size: size of the region
+ * @dma_handle: DMA (bus) address
+ * @flags: memory allocation flags
+ *
+ * dma_alloc_coherent() returns a pointer to a memory region suitable for
+ * coherent DMA traffic to/from a PCI device. On SN platforms, this means
+ * that @dma_handle will have the %PCIIO_DMA_CMD flag set.
+ *
+ * This interface is usually used for "command" streams (e.g. the command
+ * queue for a SCSI controller). See Documentation/DMA-API.txt for
+ * more information.
+ */
+static void *sn_dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t * dma_handle, gfp_t flags,
+ unsigned long attrs)
+{
+ void *cpuaddr;
+ unsigned long phys_addr;
+ int node;
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
+
+ BUG_ON(!dev_is_pci(dev));
+
+ /*
+ * Allocate the memory.
+ */
+ node = pcibus_to_node(pdev->bus);
+ if (likely(node >=0)) {
+ struct page *p = __alloc_pages_node(node,
+ flags, get_order(size));
+
+ if (likely(p))
+ cpuaddr = page_address(p);
+ else
+ return NULL;
+ } else
+ cpuaddr = (void *)__get_free_pages(flags, get_order(size));
+
+ if (unlikely(!cpuaddr))
+ return NULL;
+
+ memset(cpuaddr, 0x0, size);
+
+ /* physical addr. of the memory we just got */
+ phys_addr = __pa(cpuaddr);
+
+ /*
+ * 64 bit address translations should never fail.
+ * 32 bit translations can fail if there are insufficient mapping
+ * resources.
+ */
+
+ *dma_handle = provider->dma_map_consistent(pdev, phys_addr, size,
+ SN_DMA_ADDR_PHYS);
+ if (!*dma_handle) {
+ printk(KERN_ERR "%s: out of ATEs\n", __func__);
+ free_pages((unsigned long)cpuaddr, get_order(size));
+ return NULL;
+ }
+
+ return cpuaddr;
+}
+
+/**
+ * sn_pci_free_coherent - free memory associated with coherent DMAable region
+ * @dev: device to free for
+ * @size: size to free
+ * @cpu_addr: kernel virtual address to free
+ * @dma_handle: DMA address associated with this region
+ *
+ * Frees the memory allocated by dma_alloc_coherent(), potentially unmapping
+ * any associated IOMMU mappings.
+ */
+static void sn_dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
+ dma_addr_t dma_handle, unsigned long attrs)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
+
+ BUG_ON(!dev_is_pci(dev));
+
+ provider->dma_unmap(pdev, dma_handle, 0);
+ free_pages((unsigned long)cpu_addr, get_order(size));
+}
+
+/**
+ * sn_dma_map_single_attrs - map a single page for DMA
+ * @dev: device to map for
+ * @cpu_addr: kernel virtual address of the region to map
+ * @size: size of the region
+ * @direction: DMA direction
+ * @attrs: optional dma attributes
+ *
+ * Map the region pointed to by @cpu_addr for DMA and return the
+ * DMA address.
+ *
+ * We map this to the one step pcibr_dmamap_trans interface rather than
+ * the two step pcibr_dmamap_alloc/pcibr_dmamap_addr because we have
+ * no way of saving the dmamap handle from the alloc to later free
+ * (which is pretty much unacceptable).
+ *
+ * mappings with the DMA_ATTR_WRITE_BARRIER get mapped with
+ * dma_map_consistent() so that writes force a flush of pending DMA.
+ * (See "SGI Altix Architecture Considerations for Linux Device Drivers",
+ * Document Number: 007-4763-001)
+ *
+ * TODO: simplify our interface;
+ * figure out how to save dmamap handle so can use two step.
+ */
+static dma_addr_t sn_dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir,
+ unsigned long attrs)
+{
+ void *cpu_addr = page_address(page) + offset;
+ dma_addr_t dma_addr;
+ unsigned long phys_addr;
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
+
+ BUG_ON(!dev_is_pci(dev));
+
+ phys_addr = __pa(cpu_addr);
+ if (attrs & DMA_ATTR_WRITE_BARRIER)
+ dma_addr = provider->dma_map_consistent(pdev, phys_addr,
+ size, SN_DMA_ADDR_PHYS);
+ else
+ dma_addr = provider->dma_map(pdev, phys_addr, size,
+ SN_DMA_ADDR_PHYS);
+
+ if (!dma_addr) {
+ printk(KERN_ERR "%s: out of ATEs\n", __func__);
+ return 0;
+ }
+ return dma_addr;
+}
+
+/**
+ * sn_dma_unmap_single_attrs - unamp a DMA mapped page
+ * @dev: device to sync
+ * @dma_addr: DMA address to sync
+ * @size: size of region
+ * @direction: DMA direction
+ * @attrs: optional dma attributes
+ *
+ * This routine is supposed to sync the DMA region specified
+ * by @dma_handle into the coherence domain. On SN, we're always cache
+ * coherent, so we just need to free any ATEs associated with this mapping.
+ */
+static void sn_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
+ size_t size, enum dma_data_direction dir,
+ unsigned long attrs)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
+
+ BUG_ON(!dev_is_pci(dev));
+
+ provider->dma_unmap(pdev, dma_addr, dir);
+}
+
+/**
+ * sn_dma_unmap_sg - unmap a DMA scatterlist
+ * @dev: device to unmap
+ * @sg: scatterlist to unmap
+ * @nhwentries: number of scatterlist entries
+ * @direction: DMA direction
+ * @attrs: optional dma attributes
+ *
+ * Unmap a set of streaming mode DMA translations.
+ */
+static void sn_dma_unmap_sg(struct device *dev, struct scatterlist *sgl,
+ int nhwentries, enum dma_data_direction dir,
+ unsigned long attrs)
+{
+ int i;
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
+ struct scatterlist *sg;
+
+ BUG_ON(!dev_is_pci(dev));
+
+ for_each_sg(sgl, sg, nhwentries, i) {
+ provider->dma_unmap(pdev, sg->dma_address, dir);
+ sg->dma_address = (dma_addr_t) NULL;
+ sg->dma_length = 0;
+ }
+}
+
+/**
+ * sn_dma_map_sg - map a scatterlist for DMA
+ * @dev: device to map for
+ * @sg: scatterlist to map
+ * @nhwentries: number of entries
+ * @direction: direction of the DMA transaction
+ * @attrs: optional dma attributes
+ *
+ * mappings with the DMA_ATTR_WRITE_BARRIER get mapped with
+ * dma_map_consistent() so that writes force a flush of pending DMA.
+ * (See "SGI Altix Architecture Considerations for Linux Device Drivers",
+ * Document Number: 007-4763-001)
+ *
+ * Maps each entry of @sg for DMA.
+ */
+static int sn_dma_map_sg(struct device *dev, struct scatterlist *sgl,
+ int nhwentries, enum dma_data_direction dir,
+ unsigned long attrs)
+{
+ unsigned long phys_addr;
+ struct scatterlist *saved_sg = sgl, *sg;
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
+ int i;
+
+ BUG_ON(!dev_is_pci(dev));
+
+ /*
+ * Setup a DMA address for each entry in the scatterlist.
+ */
+ for_each_sg(sgl, sg, nhwentries, i) {
+ dma_addr_t dma_addr;
+ phys_addr = SG_ENT_PHYS_ADDRESS(sg);
+ if (attrs & DMA_ATTR_WRITE_BARRIER)
+ dma_addr = provider->dma_map_consistent(pdev,
+ phys_addr,
+ sg->length,
+ SN_DMA_ADDR_PHYS);
+ else
+ dma_addr = provider->dma_map(pdev, phys_addr,
+ sg->length,
+ SN_DMA_ADDR_PHYS);
+
+ sg->dma_address = dma_addr;
+ if (!sg->dma_address) {
+ printk(KERN_ERR "%s: out of ATEs\n", __func__);
+
+ /*
+ * Free any successfully allocated entries.
+ */
+ if (i > 0)
+ sn_dma_unmap_sg(dev, saved_sg, i, dir, attrs);
+ return 0;
+ }
+
+ sg->dma_length = sg->length;
+ }
+
+ return nhwentries;
+}
+
+static void sn_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
+ size_t size, enum dma_data_direction dir)
+{
+ BUG_ON(!dev_is_pci(dev));
+}
+
+static void sn_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
+ size_t size,
+ enum dma_data_direction dir)
+{
+ BUG_ON(!dev_is_pci(dev));
+}
+
+static void sn_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
+ int nelems, enum dma_data_direction dir)
+{
+ BUG_ON(!dev_is_pci(dev));
+}
+
+static void sn_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+ int nelems, enum dma_data_direction dir)
+{
+ BUG_ON(!dev_is_pci(dev));
+}
+
+static int sn_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+ return 0;
+}
+
+u64 sn_dma_get_required_mask(struct device *dev)
+{
+ return DMA_BIT_MASK(64);
+}
+EXPORT_SYMBOL_GPL(sn_dma_get_required_mask);
+
+char *sn_pci_get_legacy_mem(struct pci_bus *bus)
+{
+ if (!SN_PCIBUS_BUSSOFT(bus))
+ return ERR_PTR(-ENODEV);
+
+ return (char *)(SN_PCIBUS_BUSSOFT(bus)->bs_legacy_mem | __IA64_UNCACHED_OFFSET);
+}
+
+int sn_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
+{
+ unsigned long addr;
+ int ret;
+ struct ia64_sal_retval isrv;
+
+ /*
+ * First, try the SN_SAL_IOIF_PCI_SAFE SAL call which can work
+ * around hw issues at the pci bus level. SGI proms older than
+ * 4.10 don't implement this.
+ */
+
+ SAL_CALL(isrv, SN_SAL_IOIF_PCI_SAFE,
+ pci_domain_nr(bus), bus->number,
+ 0, /* io */
+ 0, /* read */
+ port, size, __pa(val));
+
+ if (isrv.status == 0)
+ return size;
+
+ /*
+ * If the above failed, retry using the SAL_PROBE call which should
+ * be present in all proms (but which cannot work round PCI chipset
+ * bugs). This code is retained for compatibility with old
+ * pre-4.10 proms, and should be removed at some point in the future.
+ */
+
+ if (!SN_PCIBUS_BUSSOFT(bus))
+ return -ENODEV;
+
+ addr = SN_PCIBUS_BUSSOFT(bus)->bs_legacy_io | __IA64_UNCACHED_OFFSET;
+ addr += port;
+
+ ret = ia64_sn_probe_mem(addr, (long)size, (void *)val);
+
+ if (ret == 2)
+ return -EINVAL;
+
+ if (ret == 1)
+ *val = -1;
+
+ return size;
+}
+
+int sn_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size)
+{
+ int ret = size;
+ unsigned long paddr;
+ unsigned long *addr;
+ struct ia64_sal_retval isrv;
+
+ /*
+ * First, try the SN_SAL_IOIF_PCI_SAFE SAL call which can work
+ * around hw issues at the pci bus level. SGI proms older than
+ * 4.10 don't implement this.
+ */
+
+ SAL_CALL(isrv, SN_SAL_IOIF_PCI_SAFE,
+ pci_domain_nr(bus), bus->number,
+ 0, /* io */
+ 1, /* write */
+ port, size, __pa(&val));
+
+ if (isrv.status == 0)
+ return size;
+
+ /*
+ * If the above failed, retry using the SAL_PROBE call which should
+ * be present in all proms (but which cannot work round PCI chipset
+ * bugs). This code is retained for compatibility with old
+ * pre-4.10 proms, and should be removed at some point in the future.
+ */
+
+ if (!SN_PCIBUS_BUSSOFT(bus)) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ /* Put the phys addr in uncached space */
+ paddr = SN_PCIBUS_BUSSOFT(bus)->bs_legacy_io | __IA64_UNCACHED_OFFSET;
+ paddr += port;
+ addr = (unsigned long *)paddr;
+
+ switch (size) {
+ case 1:
+ *(volatile u8 *)(addr) = (u8)(val);
+ break;
+ case 2:
+ *(volatile u16 *)(addr) = (u16)(val);
+ break;
+ case 4:
+ *(volatile u32 *)(addr) = (u32)(val);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ out:
+ return ret;
+}
+
+static struct dma_map_ops sn_dma_ops = {
+ .alloc = sn_dma_alloc_coherent,
+ .free = sn_dma_free_coherent,
+ .map_page = sn_dma_map_page,
+ .unmap_page = sn_dma_unmap_page,
+ .map_sg = sn_dma_map_sg,
+ .unmap_sg = sn_dma_unmap_sg,
+ .sync_single_for_cpu = sn_dma_sync_single_for_cpu,
+ .sync_sg_for_cpu = sn_dma_sync_sg_for_cpu,
+ .sync_single_for_device = sn_dma_sync_single_for_device,
+ .sync_sg_for_device = sn_dma_sync_sg_for_device,
+ .mapping_error = sn_dma_mapping_error,
+ .dma_supported = sn_dma_supported,
+};
+
+void sn_dma_init(void)
+{
+ dma_ops = &sn_dma_ops;
+}