MIPS: Better than nothing implementation of PCI mmap to fix X.

[linux-2.6-omap-h63xx.git] / arch / mips / pci / pci.c

diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
index c7fe6ec621e68524b0e4ef5d391e7e47d43e472a..62cae740e250f9d6d42df81897bf3dabe735ede9 100644 (file)
--- a/arch/mips/pci/pci.c
+++ b/arch/mips/pci/pci.c
@@ -34,6 +34,8 @@ static struct pci_controller *hose_head, **hose_tail = &hose_head;
 unsigned long PCIBIOS_MIN_IO   = 0x0000;
 unsigned long PCIBIOS_MIN_MEM  = 0;
 
+static int pci_initialized;
+
 /*
  * We need to avoid collisions with `mirrored' VGA ports
  * and other strange ISA hardware, so we always want the
@@ -74,6 +76,42 @@ pcibios_align_resource(void *data, struct resource *res,
        res->start = start;
 }
 
+static void __devinit pcibios_scanbus(struct pci_controller *hose)
+{
+       static int next_busno;
+       static int need_domain_info;
+       struct pci_bus *bus;
+
+       if (!hose->iommu)
+               PCI_DMA_BUS_IS_PHYS = 1;
+
+       if (hose->get_busno && pci_probe_only)
+               next_busno = (*hose->get_busno)();
+
+       bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
+       hose->bus = bus;
+
+       need_domain_info = need_domain_info || hose->index;
+       hose->need_domain_info = need_domain_info;
+       if (bus) {
+               next_busno = bus->subordinate + 1;
+               /* Don't allow 8-bit bus number overflow inside the hose -
+                  reserve some space for bridges. */
+               if (next_busno > 224) {
+                       next_busno = 0;
+                       need_domain_info = 1;
+               }
+
+               if (!pci_probe_only) {
+                       pci_bus_size_bridges(bus);
+                       pci_bus_assign_resources(bus);
+                       pci_enable_bridges(bus);
+               }
+       }
+}
+
+static DEFINE_MUTEX(pci_scan_mutex);
+
 void __devinit register_pci_controller(struct pci_controller *hose)
 {
        if (request_resource(&iomem_resource, hose->mem_resource) < 0)
@@ -93,6 +131,17 @@ void __devinit register_pci_controller(struct pci_controller *hose)
                printk(KERN_WARNING
                       "registering PCI controller with io_map_base unset\n");
        }
+
+       /*
+        * Scan the bus if it is register after the PCI subsystem
+        * initialization.
+        */
+       if (pci_initialized) {
+               mutex_lock(&pci_scan_mutex);
+               pcibios_scanbus(hose);
+               mutex_unlock(&pci_scan_mutex);
+       }
+
        return;
 
 out:
@@ -125,38 +174,15 @@ static u8 __init common_swizzle(struct pci_dev *dev, u8 *pinp)
 static int __init pcibios_init(void)
 {
        struct pci_controller *hose;
-       struct pci_bus *bus;
-       int next_busno;
-       int need_domain_info = 0;
 
        /* Scan all of the recorded PCI controllers.  */
-       for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
-
-               if (!hose->iommu)
-                       PCI_DMA_BUS_IS_PHYS = 1;
-
-               if (hose->get_busno && pci_probe_only)
-                       next_busno = (*hose->get_busno)();
-
-               bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
-               hose->bus = bus;
-               need_domain_info = need_domain_info || hose->index;
-               hose->need_domain_info = need_domain_info;
-               if (bus) {
-                       next_busno = bus->subordinate + 1;
-                       /* Don't allow 8-bit bus number overflow inside the hose -
-                          reserve some space for bridges. */
-                       if (next_busno > 224) {
-                               next_busno = 0;
-                               need_domain_info = 1;
-                       }
-               }
-       }
+       for (hose = hose_head; hose; hose = hose->next)
+               pcibios_scanbus(hose);
 
-       if (!pci_probe_only)
-               pci_assign_unassigned_resources();
        pci_fixup_irqs(common_swizzle, pcibios_map_irq);
 
+       pci_initialized = 1;
+
        return 0;
 }
 
@@ -328,6 +354,30 @@ EXPORT_SYMBOL(PCIBIOS_MIN_IO);
 EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
 #endif
 
+int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+                       enum pci_mmap_state mmap_state, int write_combine)
+{
+       unsigned long prot;
+
+       /*
+        * I/O space can be accessed via normal processor loads and stores on
+        * this platform but for now we elect not to do this and portable
+        * drivers should not do this anyway.
+        */
+       if (mmap_state == pci_mmap_io)
+               return -EINVAL;
+
+       /*
+        * Ignore write-combine; for now only return uncached mappings.
+        */
+       prot = pgprot_val(vma->vm_page_prot);
+       prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
+       vma->vm_page_prot = __pgprot(prot);
+
+       return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+               vma->vm_end - vma->vm_start, vma->vm_page_prot);
+}
+
 char * (*pcibios_plat_setup)(char *str) __devinitdata;
 
 char *__devinit pcibios_setup(char *str)