--- /dev/null
+/*
+ * arch/alpha/kernel/pci-sysfs.c
+ *
+ * Copyright (C) 2009 Ivan Kokshaysky
+ *
+ * Alpha PCI resource files.
+ *
+ * Loosely based on generic HAVE_PCI_MMAP implementation in
+ * drivers/pci/pci-sysfs.c
+ */
+
+#include <linux/sched.h>
+#include <linux/pci.h>
+
+static int hose_mmap_page_range(struct pci_controller *hose,
+ struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_type, int sparse)
+{
+ unsigned long base;
+
+ if (mmap_type == pci_mmap_mem)
+ base = sparse ? hose->sparse_mem_base : hose->dense_mem_base;
+ else
+ base = sparse ? hose->sparse_io_base : hose->dense_io_base;
+
+ vma->vm_pgoff += base >> PAGE_SHIFT;
+ vma->vm_flags |= (VM_IO | VM_RESERVED);
+
+ return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot);
+}
+
+static int __pci_mmap_fits(struct pci_dev *pdev, int num,
+ struct vm_area_struct *vma, int sparse)
+{
+ unsigned long nr, start, size;
+ int shift = sparse ? 5 : 0;
+
+ nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+ start = vma->vm_pgoff;
+ size = ((pci_resource_len(pdev, num) - 1) >> (PAGE_SHIFT - shift)) + 1;
+
+ if (start < size && size - start >= nr)
+ return 1;
+ WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on %s BAR %d "
+ "(size 0x%08lx)\n",
+ current->comm, sparse ? " sparse" : "", start, start + nr,
+ pci_name(pdev), num, size);
+ return 0;
+}
+
+/**
+ * pci_mmap_resource - map a PCI resource into user memory space
+ * @kobj: kobject for mapping
+ * @attr: struct bin_attribute for the file being mapped
+ * @vma: struct vm_area_struct passed into the mmap
+ * @sparse: address space type
+ *
+ * Use the bus mapping routines to map a PCI resource into userspace.
+ */
+static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
+ struct vm_area_struct *vma, int sparse)
+{
+ struct pci_dev *pdev = to_pci_dev(container_of(kobj,
+ struct device, kobj));
+ struct resource *res = (struct resource *)attr->private;
+ enum pci_mmap_state mmap_type;
+ struct pci_bus_region bar;
+ int i;
+
+ for (i = 0; i < PCI_ROM_RESOURCE; i++)
+ if (res == &pdev->resource[i])
+ break;
+ if (i >= PCI_ROM_RESOURCE)
+ return -ENODEV;
+
+ if (!__pci_mmap_fits(pdev, i, vma, sparse))
+ return -EINVAL;
+
+ if (iomem_is_exclusive(res->start))
+ return -EINVAL;
+
+ pcibios_resource_to_bus(pdev, &bar, res);
+ vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0));
+ mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
+
+ return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse);
+}
+
+static int pci_mmap_resource_sparse(struct kobject *kobj,
+ struct bin_attribute *attr,
+ struct vm_area_struct *vma)
+{
+ return pci_mmap_resource(kobj, attr, vma, 1);
+}
+
+static int pci_mmap_resource_dense(struct kobject *kobj,
+ struct bin_attribute *attr,
+ struct vm_area_struct *vma)
+{
+ return pci_mmap_resource(kobj, attr, vma, 0);
+}
+
+/**
+ * pci_remove_resource_files - cleanup resource files
+ * @dev: dev to cleanup
+ *
+ * If we created resource files for @dev, remove them from sysfs and
+ * free their resources.
+ */
+void pci_remove_resource_files(struct pci_dev *pdev)
+{
+ int i;
+
+ for (i = 0; i < PCI_ROM_RESOURCE; i++) {
+ struct bin_attribute *res_attr;
+
+ res_attr = pdev->res_attr[i];
+ if (res_attr) {
+ sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
+ kfree(res_attr);
+ }
+
+ res_attr = pdev->res_attr_wc[i];
+ if (res_attr) {
+ sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
+ kfree(res_attr);
+ }
+ }
+}
+
+static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num)
+{
+ struct pci_bus_region bar;
+ struct pci_controller *hose = pdev->sysdata;
+ long dense_offset;
+ unsigned long sparse_size;
+
+ pcibios_resource_to_bus(pdev, &bar, &pdev->resource[num]);
+
+ /* All core logic chips have 4G sparse address space, except
+ CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM
+ definitions in asm/core_xxx.h files). This corresponds
+ to 128M or 512M of the bus space. */
+ dense_offset = (long)(hose->dense_mem_base - hose->sparse_mem_base);
+ sparse_size = dense_offset >= 0x400000000UL ? 0x20000000 : 0x8000000;
+
+ return bar.end < sparse_size;
+}
+
+static int pci_create_one_attr(struct pci_dev *pdev, int num, char *name,
+ char *suffix, struct bin_attribute *res_attr,
+ unsigned long sparse)
+{
+ size_t size = pci_resource_len(pdev, num);
+
+ sprintf(name, "resource%d%s", num, suffix);
+ res_attr->mmap = sparse ? pci_mmap_resource_sparse :
+ pci_mmap_resource_dense;
+ res_attr->attr.name = name;
+ res_attr->attr.mode = S_IRUSR | S_IWUSR;
+ res_attr->size = sparse ? size << 5 : size;
+ res_attr->private = &pdev->resource[num];
+ return sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
+}
+
+static int pci_create_attr(struct pci_dev *pdev, int num)
+{
+ /* allocate attribute structure, piggyback attribute name */
+ int retval, nlen1, nlen2 = 0, res_count = 1;
+ unsigned long sparse_base, dense_base;
+ struct bin_attribute *attr;
+ struct pci_controller *hose = pdev->sysdata;
+ char *suffix, *attr_name;
+
+ suffix = ""; /* Assume bwx machine, normal resourceN files. */
+ nlen1 = 10;
+
+ if (pdev->resource[num].flags & IORESOURCE_MEM) {
+ sparse_base = hose->sparse_mem_base;
+ dense_base = hose->dense_mem_base;
+ if (sparse_base && !sparse_mem_mmap_fits(pdev, num)) {
+ sparse_base = 0;
+ suffix = "_dense";
+ nlen1 = 16; /* resourceN_dense */
+ }
+ } else {
+ sparse_base = hose->sparse_io_base;
+ dense_base = hose->dense_io_base;
+ }
+
+ if (sparse_base) {
+ suffix = "_sparse";
+ nlen1 = 17;
+ if (dense_base) {
+ nlen2 = 16; /* resourceN_dense */
+ res_count = 2;
+ }
+ }
+
+ attr = kzalloc(sizeof(*attr) * res_count + nlen1 + nlen2, GFP_ATOMIC);
+ if (!attr)
+ return -ENOMEM;
+
+ /* Create bwx, sparse or single dense file */
+ attr_name = (char *)(attr + res_count);
+ pdev->res_attr[num] = attr;
+ retval = pci_create_one_attr(pdev, num, attr_name, suffix, attr,
+ sparse_base);
+ if (retval || res_count == 1)
+ return retval;
+
+ /* Create dense file */
+ attr_name += nlen1;
+ attr++;
+ pdev->res_attr_wc[num] = attr;
+ return pci_create_one_attr(pdev, num, attr_name, "_dense", attr, 0);
+}
+
+/**
+ * pci_create_resource_files - create resource files in sysfs for @dev
+ * @dev: dev in question
+ *
+ * Walk the resources in @dev creating files for each resource available.
+ */
+int pci_create_resource_files(struct pci_dev *pdev)
+{
+ int i;
+ int retval;
+
+ /* Expose the PCI resources from this device as files */
+ for (i = 0; i < PCI_ROM_RESOURCE; i++) {
+
+ /* skip empty resources */
+ if (!pci_resource_len(pdev, i))
+ continue;
+
+ retval = pci_create_attr(pdev, i);
+ if (retval) {
+ pci_remove_resource_files(pdev);
+ return retval;
+ }
+ }
+ return 0;
+}
+
+/* Legacy I/O bus mapping stuff. */
+
+static int __legacy_mmap_fits(struct pci_controller *hose,
+ struct vm_area_struct *vma,
+ unsigned long res_size, int sparse)
+{
+ unsigned long nr, start, size;
+
+ nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+ start = vma->vm_pgoff;
+ size = ((res_size - 1) >> PAGE_SHIFT) + 1;
+
+ if (start < size && size - start >= nr)
+ return 1;
+ WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on hose %d "
+ "(size 0x%08lx)\n",
+ current->comm, sparse ? " sparse" : "", start, start + nr,
+ hose->index, size);
+ return 0;
+}
+
+static inline int has_sparse(struct pci_controller *hose,
+ enum pci_mmap_state mmap_type)
+{
+ unsigned long base;
+
+ base = (mmap_type == pci_mmap_mem) ? hose->sparse_mem_base :
+ hose->sparse_io_base;
+
+ return base != 0;
+}
+
+int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_type)
+{
+ struct pci_controller *hose = bus->sysdata;
+ int sparse = has_sparse(hose, mmap_type);
+ unsigned long res_size;
+
+ res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size :
+ bus->legacy_io->size;
+ if (!__legacy_mmap_fits(hose, vma, res_size, sparse))
+ return -EINVAL;
+
+ return hose_mmap_page_range(hose, vma, mmap_type, sparse);
+}
+
+/**
+ * pci_adjust_legacy_attr - adjustment of legacy file attributes
+ * @b: bus to create files under
+ * @mmap_type: I/O port or memory
+ *
+ * Adjust file name and size for sparse mappings.
+ */
+void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type)
+{
+ struct pci_controller *hose = bus->sysdata;
+
+ if (!has_sparse(hose, mmap_type))
+ return;
+
+ if (mmap_type == pci_mmap_mem) {
+ bus->legacy_mem->attr.name = "legacy_mem_sparse";
+ bus->legacy_mem->size <<= 5;
+ } else {
+ bus->legacy_io->attr.name = "legacy_io_sparse";
+ bus->legacy_io->size <<= 5;
+ }
+ return;
+}
+
+/* Legacy I/O bus read/write functions */
+int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
+{
+ struct pci_controller *hose = bus->sysdata;
+
+ port += hose->io_space->start;
+
+ switch(size) {
+ case 1:
+ *((u8 *)val) = inb(port);
+ return 1;
+ case 2:
+ if (port & 1)
+ return -EINVAL;
+ *((u16 *)val) = inw(port);
+ return 2;
+ case 4:
+ if (port & 3)
+ return -EINVAL;
+ *((u32 *)val) = inl(port);
+ return 4;
+ }
+ return -EINVAL;
+}
+
+int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
+{
+ struct pci_controller *hose = bus->sysdata;
+
+ port += hose->io_space->start;
+
+ switch(size) {
+ case 1:
+ outb(port, val);
+ return 1;
+ case 2:
+ if (port & 1)
+ return -EINVAL;
+ outw(port, val);
+ return 2;
+ case 4:
+ if (port & 3)
+ return -EINVAL;
+ outl(port, val);
+ return 4;
+ }
+ return -EINVAL;
+}
git.samba.org / sfrench / cifs-2.6.git / commitdiff