[MIPS] Iomap implementation.

This implementation has support for the concept of one separate ioport
address space by PCI domain.  A pointer to the virtual address where
the port space of a domain has been mapped has been added to struct
pci_controller and systems should be fixed to fill in this value. For
single domain systems this will be the same value as passed to
set_io_port_base().

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 74 insertions, 0 deletions

diff --git a/arch/mips/lib/iomap-pci.c b/arch/mips/lib/iomap-pci.c
new file mode 100644
index 000000000000..c11b2494bb6e
--- /dev/null
+++ b/arch/mips/lib/iomap-pci.c
@@ -0,0 +1,74 @@
+/*
+ * Implement the default iomap interfaces
+ *
+ * (C) Copyright 2004 Linus Torvalds
+ * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org>
+ * (C) Copyright 2007 MIPS Technologies, Inc.
+ *     written by Ralf Baechle <ralf@linux-mips.org>
+ */
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <asm/io.h>
+
+static void __iomem *ioport_map_pci(struct pci_dev *dev,
+                                     unsigned long port, unsigned int nr)
+{
+        struct pci_controller *ctrl = dev->bus->sysdata;
+        unsigned long base = ctrl->io_map_base;
+
+        /* This will eventually become a BUG_ON but for now be gentle */
+        if (unlikely(!ctrl->io_map_base)) {
+                struct pci_bus *bus = dev->bus;
+                char name[8];
+
+                while (bus->parent)
+                        bus = bus->parent;
+
+                ctrl->io_map_base = base = mips_io_port_base;
+
+                sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number);
+                printk(KERN_WARNING "io_map_base of root PCI bus %s unset.  "
+                       "Trying to continue but you better\nfix this issue or "
+                       "report it to linux-mips@linux-mips.org or your "
+                       "vendor.\n", name);
+#ifdef CONFIG_PCI_DOMAINS
+                panic("To avoid data corruption io_map_base MUST be set with "
+                      "multiple PCI domains.");
+#endif
+        }
+
+        return (void __iomem *) (ctrl->io_map_base + port);
+}
+
+/*
+ * Create a virtual mapping cookie for a PCI BAR (memory or IO)
+ */
+void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+        unsigned long start = pci_resource_start(dev, bar);
+        unsigned long len = pci_resource_len(dev, bar);
+        unsigned long flags = pci_resource_flags(dev, bar);
+
+        if (!len || !start)
+                return NULL;
+        if (maxlen && len > maxlen)
+                len = maxlen;
+        if (flags & IORESOURCE_IO)
+                return ioport_map_pci(dev, start, len);
+        if (flags & IORESOURCE_MEM) {
+                if (flags & IORESOURCE_CACHEABLE)
+                        return ioremap(start, len);
+                return ioremap_nocache(start, len);
+        }
+        /* What? */
+        return NULL;
+}
+
+EXPORT_SYMBOL(pci_iomap);
+
+void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
+{
+        iounmap(addr);
+}
+
+EXPORT_SYMBOL(pci_iounmap);