Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / sh / mm / ioremap.c

diff --git a/kernel/arch/sh/mm/ioremap.c b/kernel/arch/sh/mm/ioremap.c
new file mode 100644 (file)
index 0000000..0c99ec2
--- /dev/null
+++ b/kernel/arch/sh/mm/ioremap.c
@@ -0,0 +1,137 @@
+/*
+ * arch/sh/mm/ioremap.c
+ *
+ * (C) Copyright 1995 1996 Linus Torvalds
+ * (C) Copyright 2005 - 2010  Paul Mundt
+ *
+ * Re-map IO memory to kernel address space so that we can access it.
+ * This is needed for high PCI addresses that aren't mapped in the
+ * 640k-1MB IO memory area on PC's
+ *
+ * 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.
+ */
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/pci.h>
+#include <linux/io.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/addrspace.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/mmu.h>
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space. Needed when the kernel wants to access high addresses
+ * directly.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+void __iomem * __init_refok
+__ioremap_caller(phys_addr_t phys_addr, unsigned long size,
+                pgprot_t pgprot, void *caller)
+{
+       struct vm_struct *area;
+       unsigned long offset, last_addr, addr, orig_addr;
+       void __iomem *mapped;
+
+       /* Don't allow wraparound or zero size */
+       last_addr = phys_addr + size - 1;
+       if (!size || last_addr < phys_addr)
+               return NULL;
+
+       /*
+        * If we can't yet use the regular approach, go the fixmap route.
+        */
+       if (!mem_init_done)
+               return ioremap_fixed(phys_addr, size, pgprot);
+
+       /*
+        * First try to remap through the PMB.
+        * PMB entries are all pre-faulted.
+        */
+       mapped = pmb_remap_caller(phys_addr, size, pgprot, caller);
+       if (mapped && !IS_ERR(mapped))
+               return mapped;
+
+       /*
+        * Mappings have to be page-aligned
+        */
+       offset = phys_addr & ~PAGE_MASK;
+       phys_addr &= PAGE_MASK;
+       size = PAGE_ALIGN(last_addr+1) - phys_addr;
+
+       /*
+        * Ok, go for it..
+        */
+       area = get_vm_area_caller(size, VM_IOREMAP, caller);
+       if (!area)
+               return NULL;
+       area->phys_addr = phys_addr;
+       orig_addr = addr = (unsigned long)area->addr;
+
+       if (ioremap_page_range(addr, addr + size, phys_addr, pgprot)) {
+               vunmap((void *)orig_addr);
+               return NULL;
+       }
+
+       return (void __iomem *)(offset + (char *)orig_addr);
+}
+EXPORT_SYMBOL(__ioremap_caller);
+
+/*
+ * Simple checks for non-translatable mappings.
+ */
+static inline int iomapping_nontranslatable(unsigned long offset)
+{
+#ifdef CONFIG_29BIT
+       /*
+        * In 29-bit mode this includes the fixed P1/P2 areas, as well as
+        * parts of P3.
+        */
+       if (PXSEG(offset) < P3SEG || offset >= P3_ADDR_MAX)
+               return 1;
+#endif
+
+       return 0;
+}
+
+void __iounmap(void __iomem *addr)
+{
+       unsigned long vaddr = (unsigned long __force)addr;
+       struct vm_struct *p;
+
+       /*
+        * Nothing to do if there is no translatable mapping.
+        */
+       if (iomapping_nontranslatable(vaddr))
+               return;
+
+       /*
+        * There's no VMA if it's from an early fixed mapping.
+        */
+       if (iounmap_fixed(addr) == 0)
+               return;
+
+       /*
+        * If the PMB handled it, there's nothing else to do.
+        */
+       if (pmb_unmap(addr) == 0)
+               return;
+
+       p = remove_vm_area((void *)(vaddr & PAGE_MASK));
+       if (!p) {
+               printk(KERN_ERR "%s: bad address %p\n", __func__, addr);
+               return;
+       }
+
+       kfree(p);
+}
+EXPORT_SYMBOL(__iounmap);