2 files changed, 739 insertions, 0 deletions

diff --git a/arch/ia64/pci/Makefile b/arch/ia64/pci/Makefile
new file mode 100644
index 000000000000..e66889e6922a
--- /dev/null
+++ b/arch/ia64/pci/Makefile
@@ -0,0 +1,4 @@
+#
+# Makefile for the ia64-specific parts of the pci bus
+#
+obj-y           := pci.o
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
new file mode 100644
index 000000000000..88641e5095b5
--- /dev/null
+++ b/arch/ia64/pci/pci.c
@@ -0,0 +1,735 @@
+/*
+ * pci.c - Low-Level PCI Access in IA-64
+ *
+ * Derived from bios32.c of i386 tree.
+ *
+ * (c) Copyright 2002, 2005 Hewlett-Packard Development Company, L.P.
+ *      David Mosberger-Tang <davidm@hpl.hp.com>
+ *      Bjorn Helgaas <bjorn.helgaas@hp.com>
+ * Copyright (C) 2004 Silicon Graphics, Inc.
+ *
+ * Note: Above list of copyright holders is incomplete...
+ */
+#include <linux/config.h>
+
+#include <linux/acpi.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/spinlock.h>
+
+#include <asm/machvec.h>
+#include <asm/page.h>
+#include <asm/segment.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/sal.h>
+#include <asm/smp.h>
+#include <asm/irq.h>
+#include <asm/hw_irq.h>
+
+
+static int pci_routeirq;
+
+/*
+ * Low-level SAL-based PCI configuration access functions. Note that SAL
+ * calls are already serialized (via sal_lock), so we don't need another
+ * synchronization mechanism here.
+ */
+
+#define PCI_SAL_ADDRESS(seg, bus, devfn, reg)           \
+        (((u64) seg << 24) | (bus << 16) | (devfn << 8) | (reg))
+
+/* SAL 3.2 adds support for extended config space. */
+
+#define PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg)       \
+        (((u64) seg << 28) | (bus << 20) | (devfn << 12) | (reg))
+
+static int
+pci_sal_read (unsigned int seg, unsigned int bus, unsigned int devfn,
+              int reg, int len, u32 *value)
+{
+        u64 addr, data = 0;
+        int mode, result;
+
+        if (!value || (seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
+                return -EINVAL;
+
+        if ((seg | reg) <= 255) {
+                addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
+                mode = 0;
+        } else {
+                addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
+                mode = 1;
+        }
+        result = ia64_sal_pci_config_read(addr, mode, len, &data);
+        if (result != 0)
+                return -EINVAL;
+
+        *value = (u32) data;
+        return 0;
+}
+
+static int
+pci_sal_write (unsigned int seg, unsigned int bus, unsigned int devfn,
+               int reg, int len, u32 value)
+{
+        u64 addr;
+        int mode, result;
+
+        if ((seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
+                return -EINVAL;
+
+        if ((seg | reg) <= 255) {
+                addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
+                mode = 0;
+        } else {
+                addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
+                mode = 1;
+        }
+        result = ia64_sal_pci_config_write(addr, mode, len, value);
+        if (result != 0)
+                return -EINVAL;
+        return 0;
+}
+
+static struct pci_raw_ops pci_sal_ops = {
+        .read =         pci_sal_read,
+        .write =        pci_sal_write
+};
+
+struct pci_raw_ops *raw_pci_ops = &pci_sal_ops;
+
+static int
+pci_read (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
+{
+        return raw_pci_ops->read(pci_domain_nr(bus), bus->number,
+                                 devfn, where, size, value);
+}
+
+static int
+pci_write (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
+{
+        return raw_pci_ops->write(pci_domain_nr(bus), bus->number,
+                                  devfn, where, size, value);
+}
+
+struct pci_ops pci_root_ops = {
+        .read = pci_read,
+        .write = pci_write,
+};
+
+#ifdef CONFIG_NUMA
+extern acpi_status acpi_map_iosapic(acpi_handle, u32, void *, void **);
+static void acpi_map_iosapics(void)
+{
+        acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
+}
+#else
+static void acpi_map_iosapics(void)
+{
+        return;
+}
+#endif /* CONFIG_NUMA */
+
+static int __init
+pci_acpi_init (void)
+{
+        struct pci_dev *dev = NULL;
+
+        printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
+
+        acpi_map_iosapics();
+
+        if (pci_routeirq) {
+                /*
+                 * PCI IRQ routing is set up by pci_enable_device(), but we
+                 * also do it here in case there are still broken drivers that
+                 * don't use pci_enable_device().
+                 */
+                printk(KERN_INFO "PCI: Routing interrupts for all devices because \"pci=routeirq\" specified\n");
+                for_each_pci_dev(dev)
+                        acpi_pci_irq_enable(dev);
+        } else
+                printk(KERN_INFO "PCI: If a device doesn't work, try \"pci=routeirq\".  If it helps, post a report\n");
+
+        return 0;
+}
+
+subsys_initcall(pci_acpi_init);
+
+/* Called by ACPI when it finds a new root bus.  */
+
+static struct pci_controller * __devinit
+alloc_pci_controller (int seg)
+{
+        struct pci_controller *controller;
+
+        controller = kmalloc(sizeof(*controller), GFP_KERNEL);
+        if (!controller)
+                return NULL;
+
+        memset(controller, 0, sizeof(*controller));
+        controller->segment = seg;
+        return controller;
+}
+
+static u64 __devinit
+add_io_space (struct acpi_resource_address64 *addr)
+{
+        u64 offset;
+        int sparse = 0;
+        int i;
+
+        if (addr->address_translation_offset == 0)
+                return IO_SPACE_BASE(0);        /* part of legacy IO space */
+
+        if (addr->attribute.io.translation_attribute == ACPI_SPARSE_TRANSLATION)
+                sparse = 1;
+
+        offset = (u64) ioremap(addr->address_translation_offset, 0);
+        for (i = 0; i < num_io_spaces; i++)
+                if (io_space[i].mmio_base == offset &&
+                    io_space[i].sparse == sparse)
+                        return IO_SPACE_BASE(i);
+
+        if (num_io_spaces == MAX_IO_SPACES) {
+                printk("Too many IO port spaces\n");
+                return ~0;
+        }
+
+        i = num_io_spaces++;
+        io_space[i].mmio_base = offset;
+        io_space[i].sparse = sparse;
+
+        return IO_SPACE_BASE(i);
+}
+
+static acpi_status __devinit
+count_window (struct acpi_resource *resource, void *data)
+{
+        unsigned int *windows = (unsigned int *) data;
+        struct acpi_resource_address64 addr;
+        acpi_status status;
+
+        status = acpi_resource_to_address64(resource, &addr);
+        if (ACPI_SUCCESS(status))
+                if (addr.resource_type == ACPI_MEMORY_RANGE ||
+                    addr.resource_type == ACPI_IO_RANGE)
+                        (*windows)++;
+
+        return AE_OK;
+}
+
+struct pci_root_info {
+        struct pci_controller *controller;
+        char *name;
+};
+
+static __devinit acpi_status add_window(struct acpi_resource *res, void *data)
+{
+        struct pci_root_info *info = data;
+        struct pci_window *window;
+        struct acpi_resource_address64 addr;
+        acpi_status status;
+        unsigned long flags, offset = 0;
+        struct resource *root;
+
+        status = acpi_resource_to_address64(res, &addr);
+        if (!ACPI_SUCCESS(status))
+                return AE_OK;
+
+        if (!addr.address_length)
+                return AE_OK;
+
+        if (addr.resource_type == ACPI_MEMORY_RANGE) {
+                flags = IORESOURCE_MEM;
+                root = &iomem_resource;
+                offset = addr.address_translation_offset;
+        } else if (addr.resource_type == ACPI_IO_RANGE) {
+                flags = IORESOURCE_IO;
+                root = &ioport_resource;
+                offset = add_io_space(&addr);
+                if (offset == ~0)
+                        return AE_OK;
+        } else
+                return AE_OK;
+
+        window = &info->controller->window[info->controller->windows++];
+        window->resource.name = info->name;
+        window->resource.flags = flags;
+        window->resource.start = addr.min_address_range + offset;
+        window->resource.end = addr.max_address_range + offset;
+        window->resource.child = NULL;
+        window->offset = offset;
+
+        if (insert_resource(root, &window->resource)) {
+                printk(KERN_ERR "alloc 0x%lx-0x%lx from %s for %s failed\n",
+                        window->resource.start, window->resource.end,
+                        root->name, info->name);
+        }
+
+        return AE_OK;
+}
+
+static void __devinit
+pcibios_setup_root_windows(struct pci_bus *bus, struct pci_controller *ctrl)
+{
+        int i, j;
+
+        j = 0;
+        for (i = 0; i < ctrl->windows; i++) {
+                struct resource *res = &ctrl->window[i].resource;
+                /* HP's firmware has a hack to work around a Windows bug.
+                 * Ignore these tiny memory ranges */
+                if ((res->flags & IORESOURCE_MEM) &&
+                    (res->end - res->start < 16))
+                        continue;
+                if (j >= PCI_BUS_NUM_RESOURCES) {
+                        printk("Ignoring range [%lx-%lx] (%lx)\n", res->start,
+                                        res->end, res->flags);
+                        continue;
+                }
+                bus->resource[j++] = res;
+        }
+}
+
+struct pci_bus * __devinit
+pci_acpi_scan_root(struct acpi_device *device, int domain, int bus)
+{
+        struct pci_root_info info;
+        struct pci_controller *controller;
+        unsigned int windows = 0;
+        struct pci_bus *pbus;
+        char *name;
+
+        controller = alloc_pci_controller(domain);
+        if (!controller)
+                goto out1;
+
+        controller->acpi_handle = device->handle;
+
+        acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_window,
+                        &windows);
+        controller->window = kmalloc(sizeof(*controller->window) * windows,
+                        GFP_KERNEL);
+        if (!controller->window)
+                goto out2;
+
+        name = kmalloc(16, GFP_KERNEL);
+        if (!name)
+                goto out3;
+
+        sprintf(name, "PCI Bus %04x:%02x", domain, bus);
+        info.controller = controller;
+        info.name = name;
+        acpi_walk_resources(device->handle, METHOD_NAME__CRS, add_window,
+                        &info);
+
+        pbus = pci_scan_bus(bus, &pci_root_ops, controller);
+        if (pbus)
+                pcibios_setup_root_windows(pbus, controller);
+
+        return pbus;
+
+out3:
+        kfree(controller->window);
+out2:
+        kfree(controller);
+out1:
+        return NULL;
+}
+
+void pcibios_resource_to_bus(struct pci_dev *dev,
+                struct pci_bus_region *region, struct resource *res)
+{
+        struct pci_controller *controller = PCI_CONTROLLER(dev);
+        unsigned long offset = 0;
+        int i;
+
+        for (i = 0; i < controller->windows; i++) {
+                struct pci_window *window = &controller->window[i];
+                if (!(window->resource.flags & res->flags))
+                        continue;
+                if (window->resource.start > res->start)
+                        continue;
+                if (window->resource.end < res->end)
+                        continue;
+                offset = window->offset;
+                break;
+        }
+
+        region->start = res->start - offset;
+        region->end = res->end - offset;
+}
+EXPORT_SYMBOL(pcibios_resource_to_bus);
+
+void pcibios_bus_to_resource(struct pci_dev *dev,
+                struct resource *res, struct pci_bus_region *region)
+{
+        struct pci_controller *controller = PCI_CONTROLLER(dev);
+        unsigned long offset = 0;
+        int i;
+
+        for (i = 0; i < controller->windows; i++) {
+                struct pci_window *window = &controller->window[i];
+                if (!(window->resource.flags & res->flags))
+                        continue;
+                if (window->resource.start - window->offset > region->start)
+                        continue;
+                if (window->resource.end - window->offset < region->end)
+                        continue;
+                offset = window->offset;
+                break;
+        }
+
+        res->start = region->start + offset;
+        res->end = region->end + offset;
+}
+
+static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
+{
+        struct pci_bus_region region;
+        int i;
+        int limit = (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) ? \
+                PCI_BRIDGE_RESOURCES : PCI_NUM_RESOURCES;
+
+        for (i = 0; i < limit; i++) {
+                if (!dev->resource[i].flags)
+                        continue;
+                region.start = dev->resource[i].start;
+                region.end = dev->resource[i].end;
+                pcibios_bus_to_resource(dev, &dev->resource[i], &region);
+                pci_claim_resource(dev, i);
+        }
+}
+
+/*
+ *  Called after each bus is probed, but before its children are examined.
+ */
+void __devinit
+pcibios_fixup_bus (struct pci_bus *b)
+{
+        struct pci_dev *dev;
+
+        list_for_each_entry(dev, &b->devices, bus_list)
+                pcibios_fixup_device_resources(dev);
+
+        return;
+}
+
+void __devinit
+pcibios_update_irq (struct pci_dev *dev, int irq)
+{
+        pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
+
+        /* ??? FIXME -- record old value for shutdown.  */
+}
+
+static inline int
+pcibios_enable_resources (struct pci_dev *dev, int mask)
+{
+        u16 cmd, old_cmd;
+        int idx;
+        struct resource *r;
+
+        if (!dev)
+                return -EINVAL;
+
+        pci_read_config_word(dev, PCI_COMMAND, &cmd);
+        old_cmd = cmd;
+        for (idx=0; idx<6; idx++) {
+                /* Only set up the desired resources.  */
+                if (!(mask & (1 << idx)))
+                        continue;
+
+                r = &dev->resource[idx];
+                if (!r->start && r->end) {
+                        printk(KERN_ERR
+                               "PCI: Device %s not available because of resource collisions\n",
+                               pci_name(dev));
+                        return -EINVAL;
+                }
+                if (r->flags & IORESOURCE_IO)
+                        cmd |= PCI_COMMAND_IO;
+                if (r->flags & IORESOURCE_MEM)
+                        cmd |= PCI_COMMAND_MEMORY;
+        }
+        if (dev->resource[PCI_ROM_RESOURCE].start)
+                cmd |= PCI_COMMAND_MEMORY;
+        if (cmd != old_cmd) {
+                printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
+                pci_write_config_word(dev, PCI_COMMAND, cmd);
+        }
+        return 0;
+}
+
+int
+pcibios_enable_device (struct pci_dev *dev, int mask)
+{
+        int ret;
+
+        ret = pcibios_enable_resources(dev, mask);
+        if (ret < 0)
+                return ret;
+
+        return acpi_pci_irq_enable(dev);
+}
+
+#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
+void
+pcibios_disable_device (struct pci_dev *dev)
+{
+        acpi_pci_irq_disable(dev);
+}
+#endif /* CONFIG_ACPI_DEALLOCATE_IRQ */
+
+void
+pcibios_align_resource (void *data, struct resource *res,
+                        unsigned long size, unsigned long align)
+{
+}
+
+/*
+ * PCI BIOS setup, always defaults to SAL interface
+ */
+char * __init
+pcibios_setup (char *str)
+{
+        if (!strcmp(str, "routeirq"))
+                pci_routeirq = 1;
+        return NULL;
+}
+
+int
+pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
+                     enum pci_mmap_state mmap_state, int write_combine)
+{
+        /*
+         * I/O space cannot be accessed via normal processor loads and
+         * stores on this platform.
+         */
+        if (mmap_state == pci_mmap_io)
+                /*
+                 * XXX we could relax this for I/O spaces for which ACPI
+                 * indicates that the space is 1-to-1 mapped.  But at the
+                 * moment, we don't support multiple PCI address spaces and
+                 * the legacy I/O space is not 1-to-1 mapped, so this is moot.
+                 */
+                return -EINVAL;
+
+        /*
+         * Leave vm_pgoff as-is, the PCI space address is the physical
+         * address on this platform.
+         */
+        vma->vm_flags |= (VM_SHM | VM_RESERVED | VM_IO);
+
+        if (write_combine && efi_range_is_wc(vma->vm_start,
+                                             vma->vm_end - vma->vm_start))
+                vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+        else
+                vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+        if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+                             vma->vm_end - vma->vm_start, vma->vm_page_prot))
+                return -EAGAIN;
+
+        return 0;
+}
+
+/**
+ * ia64_pci_get_legacy_mem - generic legacy mem routine
+ * @bus: bus to get legacy memory base address for
+ *
+ * Find the base of legacy memory for @bus.  This is typically the first
+ * megabyte of bus address space for @bus or is simply 0 on platforms whose
+ * chipsets support legacy I/O and memory routing.  Returns the base address
+ * or an error pointer if an error occurred.
+ *
+ * This is the ia64 generic version of this routine.  Other platforms
+ * are free to override it with a machine vector.
+ */
+char *ia64_pci_get_legacy_mem(struct pci_bus *bus)
+{
+        return (char *)__IA64_UNCACHED_OFFSET;
+}
+
+/**
+ * pci_mmap_legacy_page_range - map legacy memory space to userland
+ * @bus: bus whose legacy space we're mapping
+ * @vma: vma passed in by mmap
+ *
+ * Map legacy memory space for this device back to userspace using a machine
+ * vector to get the base address.
+ */
+int
+pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma)
+{
+        char *addr;
+
+        addr = pci_get_legacy_mem(bus);
+        if (IS_ERR(addr))
+                return PTR_ERR(addr);
+
+        vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
+        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+        vma->vm_flags |= (VM_SHM | VM_RESERVED | VM_IO);
+
+        if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+                            vma->vm_end - vma->vm_start, vma->vm_page_prot))
+                return -EAGAIN;
+
+        return 0;
+}
+
+/**
+ * ia64_pci_legacy_read - read from legacy I/O space
+ * @bus: bus to read
+ * @port: legacy port value
+ * @val: caller allocated storage for returned value
+ * @size: number of bytes to read
+ *
+ * Simply reads @size bytes from @port and puts the result in @val.
+ *
+ * Again, this (and the write routine) are generic versions that can be
+ * overridden by the platform.  This is necessary on platforms that don't
+ * support legacy I/O routing or that hard fail on legacy I/O timeouts.
+ */
+int ia64_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
+{
+        int ret = size;
+
+        switch (size) {
+        case 1:
+                *val = inb(port);
+                break;
+        case 2:
+                *val = inw(port);
+                break;
+        case 4:
+                *val = inl(port);
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+/**
+ * ia64_pci_legacy_write - perform a legacy I/O write
+ * @bus: bus pointer
+ * @port: port to write
+ * @val: value to write
+ * @size: number of bytes to write from @val
+ *
+ * Simply writes @size bytes of @val to @port.
+ */
+int ia64_pci_legacy_write(struct pci_dev *bus, u16 port, u32 val, u8 size)
+{
+        int ret = 0;
+
+        switch (size) {
+        case 1:
+                outb(val, port);
+                break;
+        case 2:
+                outw(val, port);
+                break;
+        case 4:
+                outl(val, port);
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+/**
+ * pci_cacheline_size - determine cacheline size for PCI devices
+ * @dev: void
+ *
+ * We want to use the line-size of the outer-most cache.  We assume
+ * that this line-size is the same for all CPUs.
+ *
+ * Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info().
+ *
+ * RETURNS: An appropriate -ERRNO error value on eror, or zero for success.
+ */
+static unsigned long
+pci_cacheline_size (void)
+{
+        u64 levels, unique_caches;
+        s64 status;
+        pal_cache_config_info_t cci;
+        static u8 cacheline_size;
+
+        if (cacheline_size)
+                return cacheline_size;
+
+        status = ia64_pal_cache_summary(&levels, &unique_caches);
+        if (status != 0) {
+                printk(KERN_ERR "%s: ia64_pal_cache_summary() failed (status=%ld)\n",
+                       __FUNCTION__, status);
+                return SMP_CACHE_BYTES;
+        }
+
+        status = ia64_pal_cache_config_info(levels - 1, /* cache_type (data_or_unified)= */ 2,
+                                            &cci);
+        if (status != 0) {
+                printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed (status=%ld)\n",
+                       __FUNCTION__, status);
+                return SMP_CACHE_BYTES;
+        }
+        cacheline_size = 1 << cci.pcci_line_size;
+        return cacheline_size;
+}
+
+/**
+ * pcibios_prep_mwi - helper function for drivers/pci/pci.c:pci_set_mwi()
+ * @dev: the PCI device for which MWI is enabled
+ *
+ * For ia64, we can get the cacheline sizes from PAL.
+ *
+ * RETURNS: An appropriate -ERRNO error value on eror, or zero for success.
+ */
+int
+pcibios_prep_mwi (struct pci_dev *dev)
+{
+        unsigned long desired_linesize, current_linesize;
+        int rc = 0;
+        u8 pci_linesize;
+
+        desired_linesize = pci_cacheline_size();
+
+        pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &pci_linesize);
+        current_linesize = 4 * pci_linesize;
+        if (desired_linesize != current_linesize) {
+                printk(KERN_WARNING "PCI: slot %s has incorrect PCI cache line size of %lu bytes,",
+                       pci_name(dev), current_linesize);
+                if (current_linesize > desired_linesize) {
+                        printk(" expected %lu bytes instead\n", desired_linesize);
+                        rc = -EINVAL;
+                } else {
+                        printk(" correcting to %lu\n", desired_linesize);
+                        pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, desired_linesize / 4);
+                }
+        }
+        return rc;
+}
+
+int pci_vector_resources(int last, int nr_released)
+{
+        int count = nr_released;
+
+        count += (IA64_LAST_DEVICE_VECTOR - last);
+
+        return count;
+}